aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Virtio Support |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2007 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Anthony Liguori <aliguori@us.ibm.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 10 | * the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
| 13 | |
Peter Maydell | 9b8bfe2 | 2016-01-26 18:17:07 +0000 | [diff] [blame] | 14 | #include "qemu/osdep.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 15 | #include "qapi/error.h" |
Paolo Bonzini | 4771d75 | 2016-01-19 21:51:44 +0100 | [diff] [blame] | 16 | #include "cpu.h" |
Stefan Hajnoczi | 64979a4 | 2010-05-24 13:19:21 +0100 | [diff] [blame] | 17 | #include "trace.h" |
Edgar E. Iglesias | fdfba1a | 2013-11-15 14:46:38 +0100 | [diff] [blame] | 18 | #include "exec/address-spaces.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 19 | #include "qemu/error-report.h" |
Felipe Franciosi | d68cdae | 2020-10-28 13:47:03 +0000 | [diff] [blame] | 20 | #include "qemu/log.h" |
Markus Armbruster | db72581 | 2019-08-12 07:23:50 +0200 | [diff] [blame] | 21 | #include "qemu/main-loop.h" |
Markus Armbruster | 0b8fa32 | 2019-05-23 16:35:07 +0200 | [diff] [blame] | 22 | #include "qemu/module.h" |
Paolo Bonzini | 0d09e41 | 2013-02-05 17:06:20 +0100 | [diff] [blame] | 23 | #include "hw/virtio/virtio.h" |
Markus Armbruster | ca77ee2 | 2019-08-12 07:23:39 +0200 | [diff] [blame] | 24 | #include "migration/qemu-file-types.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 25 | #include "qemu/atomic.h" |
Paolo Bonzini | 0d09e41 | 2013-02-05 17:06:20 +0100 | [diff] [blame] | 26 | #include "hw/virtio/virtio-bus.h" |
Markus Armbruster | a27bd6c | 2019-08-12 07:23:51 +0200 | [diff] [blame] | 27 | #include "hw/qdev-properties.h" |
Rusty Russell | cee3ca0 | 2014-06-24 19:40:16 +0200 | [diff] [blame] | 28 | #include "hw/virtio/virtio-access.h" |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 29 | #include "sysemu/dma.h" |
Markus Armbruster | 54d3123 | 2019-08-12 07:23:59 +0200 | [diff] [blame] | 30 | #include "sysemu/runstate.h" |
Cornelia Huck | 7c78bdd | 2020-07-07 12:54:45 +0200 | [diff] [blame] | 31 | #include "standard-headers/linux/virtio_ids.h" |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 32 | |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 33 | /* |
| 34 | * The alignment to use between consumer and producer parts of vring. |
| 35 | * x86 pagesize again. This is the default, used by transports like PCI |
| 36 | * which don't provide a means for the guest to tell the host the alignment. |
| 37 | */ |
aliguori | f46f15b | 2008-12-04 19:58:45 +0000 | [diff] [blame] | 38 | #define VIRTIO_PCI_VRING_ALIGN 4096 |
| 39 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 40 | typedef struct VRingDesc |
| 41 | { |
| 42 | uint64_t addr; |
| 43 | uint32_t len; |
| 44 | uint16_t flags; |
| 45 | uint16_t next; |
| 46 | } VRingDesc; |
| 47 | |
Wei Xu | a40dcec | 2019-10-25 10:35:20 +0200 | [diff] [blame] | 48 | typedef struct VRingPackedDesc { |
| 49 | uint64_t addr; |
| 50 | uint32_t len; |
| 51 | uint16_t id; |
| 52 | uint16_t flags; |
| 53 | } VRingPackedDesc; |
| 54 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 55 | typedef struct VRingAvail |
| 56 | { |
| 57 | uint16_t flags; |
| 58 | uint16_t idx; |
Philippe Mathieu-Daudé | f7795e4 | 2020-03-04 16:38:15 +0100 | [diff] [blame] | 59 | uint16_t ring[]; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 60 | } VRingAvail; |
| 61 | |
| 62 | typedef struct VRingUsedElem |
| 63 | { |
| 64 | uint32_t id; |
| 65 | uint32_t len; |
| 66 | } VRingUsedElem; |
| 67 | |
| 68 | typedef struct VRingUsed |
| 69 | { |
| 70 | uint16_t flags; |
| 71 | uint16_t idx; |
Philippe Mathieu-Daudé | f7795e4 | 2020-03-04 16:38:15 +0100 | [diff] [blame] | 72 | VRingUsedElem ring[]; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 73 | } VRingUsed; |
| 74 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 75 | typedef struct VRingMemoryRegionCaches { |
| 76 | struct rcu_head rcu; |
| 77 | MemoryRegionCache desc; |
| 78 | MemoryRegionCache avail; |
| 79 | MemoryRegionCache used; |
| 80 | } VRingMemoryRegionCaches; |
| 81 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 82 | typedef struct VRing |
| 83 | { |
| 84 | unsigned int num; |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 85 | unsigned int num_default; |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 86 | unsigned int align; |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 87 | hwaddr desc; |
| 88 | hwaddr avail; |
| 89 | hwaddr used; |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 90 | VRingMemoryRegionCaches *caches; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 91 | } VRing; |
| 92 | |
Wei Xu | a40dcec | 2019-10-25 10:35:20 +0200 | [diff] [blame] | 93 | typedef struct VRingPackedDescEvent { |
| 94 | uint16_t off_wrap; |
| 95 | uint16_t flags; |
| 96 | } VRingPackedDescEvent ; |
| 97 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 98 | struct VirtQueue |
| 99 | { |
| 100 | VRing vring; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 101 | VirtQueueElement *used_elems; |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 102 | |
| 103 | /* Next head to pop */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 104 | uint16_t last_avail_idx; |
Wei Xu | a40dcec | 2019-10-25 10:35:20 +0200 | [diff] [blame] | 105 | bool last_avail_wrap_counter; |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 106 | |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 107 | /* Last avail_idx read from VQ. */ |
| 108 | uint16_t shadow_avail_idx; |
Wei Xu | a40dcec | 2019-10-25 10:35:20 +0200 | [diff] [blame] | 109 | bool shadow_avail_wrap_counter; |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 110 | |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 111 | uint16_t used_idx; |
Wei Xu | a40dcec | 2019-10-25 10:35:20 +0200 | [diff] [blame] | 112 | bool used_wrap_counter; |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 113 | |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 114 | /* Last used index value we have signalled on */ |
| 115 | uint16_t signalled_used; |
| 116 | |
| 117 | /* Last used index value we have signalled on */ |
| 118 | bool signalled_used_valid; |
| 119 | |
Stefan Hajnoczi | 332fa82 | 2017-01-12 11:46:10 +0000 | [diff] [blame] | 120 | /* Notification enabled? */ |
| 121 | bool notification; |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 122 | |
Jason Wang | e78a2b4 | 2013-01-30 19:12:37 +0800 | [diff] [blame] | 123 | uint16_t queue_index; |
| 124 | |
Halil Pasic | e66bcc4 | 2016-12-19 16:44:44 +0100 | [diff] [blame] | 125 | unsigned int inuse; |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 126 | |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 127 | uint16_t vector; |
Fam Zheng | bf1780b | 2016-07-13 13:09:43 +0800 | [diff] [blame] | 128 | VirtIOHandleOutput handle_output; |
Fam Zheng | 0793169 | 2017-02-09 16:40:47 +0800 | [diff] [blame] | 129 | VirtIOHandleAIOOutput handle_aio_output; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 130 | VirtIODevice *vdev; |
| 131 | EventNotifier guest_notifier; |
| 132 | EventNotifier host_notifier; |
Stefan Hajnoczi | fcccb27 | 2019-11-05 15:09:46 +0100 | [diff] [blame] | 133 | bool host_notifier_enabled; |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 134 | QLIST_ENTRY(VirtQueue) node; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 135 | }; |
| 136 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 137 | static void virtio_free_region_cache(VRingMemoryRegionCaches *caches) |
| 138 | { |
| 139 | if (!caches) { |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | address_space_cache_destroy(&caches->desc); |
| 144 | address_space_cache_destroy(&caches->avail); |
| 145 | address_space_cache_destroy(&caches->used); |
| 146 | g_free(caches); |
| 147 | } |
| 148 | |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 149 | static void virtio_virtqueue_reset_region_cache(struct VirtQueue *vq) |
| 150 | { |
| 151 | VRingMemoryRegionCaches *caches; |
| 152 | |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 153 | caches = qatomic_read(&vq->vring.caches); |
| 154 | qatomic_rcu_set(&vq->vring.caches, NULL); |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 155 | if (caches) { |
| 156 | call_rcu(caches, virtio_free_region_cache, rcu); |
| 157 | } |
| 158 | } |
| 159 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 160 | static void virtio_init_region_cache(VirtIODevice *vdev, int n) |
| 161 | { |
| 162 | VirtQueue *vq = &vdev->vq[n]; |
| 163 | VRingMemoryRegionCaches *old = vq->vring.caches; |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 164 | VRingMemoryRegionCaches *new = NULL; |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 165 | hwaddr addr, size; |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 166 | int64_t len; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 167 | bool packed; |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 168 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 169 | |
| 170 | addr = vq->vring.desc; |
| 171 | if (!addr) { |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 172 | goto out_no_cache; |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 173 | } |
| 174 | new = g_new0(VRingMemoryRegionCaches, 1); |
| 175 | size = virtio_queue_get_desc_size(vdev, n); |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 176 | packed = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
| 177 | true : false; |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 178 | len = address_space_cache_init(&new->desc, vdev->dma_as, |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 179 | addr, size, packed); |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 180 | if (len < size) { |
| 181 | virtio_error(vdev, "Cannot map desc"); |
| 182 | goto err_desc; |
| 183 | } |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 184 | |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 185 | size = virtio_queue_get_used_size(vdev, n); |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 186 | len = address_space_cache_init(&new->used, vdev->dma_as, |
| 187 | vq->vring.used, size, true); |
| 188 | if (len < size) { |
| 189 | virtio_error(vdev, "Cannot map used"); |
| 190 | goto err_used; |
| 191 | } |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 192 | |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 193 | size = virtio_queue_get_avail_size(vdev, n); |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 194 | len = address_space_cache_init(&new->avail, vdev->dma_as, |
| 195 | vq->vring.avail, size, false); |
| 196 | if (len < size) { |
| 197 | virtio_error(vdev, "Cannot map avail"); |
| 198 | goto err_avail; |
| 199 | } |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 200 | |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 201 | qatomic_rcu_set(&vq->vring.caches, new); |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 202 | if (old) { |
| 203 | call_rcu(old, virtio_free_region_cache, rcu); |
| 204 | } |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 205 | return; |
| 206 | |
| 207 | err_avail: |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 208 | address_space_cache_destroy(&new->avail); |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 209 | err_used: |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 210 | address_space_cache_destroy(&new->used); |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 211 | err_desc: |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 212 | address_space_cache_destroy(&new->desc); |
| 213 | out_no_cache: |
Jason Wang | e45da65 | 2017-03-15 19:48:32 +0800 | [diff] [blame] | 214 | g_free(new); |
Paolo Bonzini | 45641db | 2018-05-15 15:25:31 +0200 | [diff] [blame] | 215 | virtio_virtqueue_reset_region_cache(vq); |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 216 | } |
| 217 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 218 | /* virt queue functions */ |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 219 | void virtio_queue_update_rings(VirtIODevice *vdev, int n) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 220 | { |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 221 | VRing *vring = &vdev->vq[n].vring; |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 222 | |
Prasad J Pandit | 758ead3 | 2017-11-29 23:14:27 +0530 | [diff] [blame] | 223 | if (!vring->num || !vring->desc || !vring->align) { |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 224 | /* not yet setup -> nothing to do */ |
| 225 | return; |
| 226 | } |
| 227 | vring->avail = vring->desc + vring->num * sizeof(VRingDesc); |
| 228 | vring->used = vring_align(vring->avail + |
| 229 | offsetof(VRingAvail, ring[vring->num]), |
| 230 | vring->align); |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 231 | virtio_init_region_cache(vdev, n); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 232 | } |
| 233 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 234 | /* Called within rcu_read_lock(). */ |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 235 | static void vring_split_desc_read(VirtIODevice *vdev, VRingDesc *desc, |
| 236 | MemoryRegionCache *cache, int i) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 237 | { |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 238 | address_space_read_cached(cache, i * sizeof(VRingDesc), |
| 239 | desc, sizeof(VRingDesc)); |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 240 | virtio_tswap64s(vdev, &desc->addr); |
| 241 | virtio_tswap32s(vdev, &desc->len); |
| 242 | virtio_tswap16s(vdev, &desc->flags); |
| 243 | virtio_tswap16s(vdev, &desc->next); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 244 | } |
| 245 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 246 | static void vring_packed_event_read(VirtIODevice *vdev, |
| 247 | MemoryRegionCache *cache, |
| 248 | VRingPackedDescEvent *e) |
| 249 | { |
| 250 | hwaddr off_off = offsetof(VRingPackedDescEvent, off_wrap); |
| 251 | hwaddr off_flags = offsetof(VRingPackedDescEvent, flags); |
| 252 | |
| 253 | address_space_read_cached(cache, off_flags, &e->flags, |
| 254 | sizeof(e->flags)); |
| 255 | /* Make sure flags is seen before off_wrap */ |
| 256 | smp_rmb(); |
| 257 | address_space_read_cached(cache, off_off, &e->off_wrap, |
| 258 | sizeof(e->off_wrap)); |
| 259 | virtio_tswap16s(vdev, &e->off_wrap); |
| 260 | virtio_tswap16s(vdev, &e->flags); |
| 261 | } |
| 262 | |
| 263 | static void vring_packed_off_wrap_write(VirtIODevice *vdev, |
| 264 | MemoryRegionCache *cache, |
| 265 | uint16_t off_wrap) |
| 266 | { |
| 267 | hwaddr off = offsetof(VRingPackedDescEvent, off_wrap); |
| 268 | |
| 269 | virtio_tswap16s(vdev, &off_wrap); |
| 270 | address_space_write_cached(cache, off, &off_wrap, sizeof(off_wrap)); |
| 271 | address_space_cache_invalidate(cache, off, sizeof(off_wrap)); |
| 272 | } |
| 273 | |
| 274 | static void vring_packed_flags_write(VirtIODevice *vdev, |
| 275 | MemoryRegionCache *cache, uint16_t flags) |
| 276 | { |
| 277 | hwaddr off = offsetof(VRingPackedDescEvent, flags); |
| 278 | |
| 279 | virtio_tswap16s(vdev, &flags); |
| 280 | address_space_write_cached(cache, off, &flags, sizeof(flags)); |
| 281 | address_space_cache_invalidate(cache, off, sizeof(flags)); |
| 282 | } |
| 283 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 284 | /* Called within rcu_read_lock(). */ |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 285 | static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq) |
| 286 | { |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 287 | return qatomic_rcu_read(&vq->vring.caches); |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 288 | } |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 289 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 290 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 291 | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
| 292 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 293 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 294 | hwaddr pa = offsetof(VRingAvail, flags); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 295 | |
| 296 | if (!caches) { |
| 297 | return 0; |
| 298 | } |
| 299 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 300 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 301 | } |
| 302 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 303 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 304 | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
| 305 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 306 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 307 | hwaddr pa = offsetof(VRingAvail, idx); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 308 | |
| 309 | if (!caches) { |
| 310 | return 0; |
| 311 | } |
| 312 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 313 | vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 314 | return vq->shadow_avail_idx; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 315 | } |
| 316 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 317 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 318 | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
| 319 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 320 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 321 | hwaddr pa = offsetof(VRingAvail, ring[i]); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 322 | |
| 323 | if (!caches) { |
| 324 | return 0; |
| 325 | } |
| 326 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 327 | return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 328 | } |
| 329 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 330 | /* Called within rcu_read_lock(). */ |
Michael S. Tsirkin | e9600c6 | 2015-02-16 22:35:46 +0100 | [diff] [blame] | 331 | static inline uint16_t vring_get_used_event(VirtQueue *vq) |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 332 | { |
| 333 | return vring_avail_ring(vq, vq->vring.num); |
| 334 | } |
| 335 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 336 | /* Called within rcu_read_lock(). */ |
Vincenzo Maffione | 1cdd2ee | 2016-01-31 11:29:06 +0100 | [diff] [blame] | 337 | static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem, |
| 338 | int i) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 339 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 340 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 341 | hwaddr pa = offsetof(VRingUsed, ring[i]); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 342 | |
| 343 | if (!caches) { |
| 344 | return; |
| 345 | } |
| 346 | |
Vincenzo Maffione | 1cdd2ee | 2016-01-31 11:29:06 +0100 | [diff] [blame] | 347 | virtio_tswap32s(vq->vdev, &uelem->id); |
| 348 | virtio_tswap32s(vq->vdev, &uelem->len); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 349 | address_space_write_cached(&caches->used, pa, uelem, sizeof(VRingUsedElem)); |
| 350 | address_space_cache_invalidate(&caches->used, pa, sizeof(VRingUsedElem)); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 351 | } |
| 352 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 353 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 354 | static uint16_t vring_used_idx(VirtQueue *vq) |
| 355 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 356 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 357 | hwaddr pa = offsetof(VRingUsed, idx); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 358 | |
| 359 | if (!caches) { |
| 360 | return 0; |
| 361 | } |
| 362 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 363 | return virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 364 | } |
| 365 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 366 | /* Called within rcu_read_lock(). */ |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 367 | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 368 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 369 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 370 | hwaddr pa = offsetof(VRingUsed, idx); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 371 | |
| 372 | if (caches) { |
| 373 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); |
| 374 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); |
| 375 | } |
| 376 | |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 377 | vq->used_idx = val; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 378 | } |
| 379 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 380 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 381 | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
| 382 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 383 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Rusty Russell | cee3ca0 | 2014-06-24 19:40:16 +0200 | [diff] [blame] | 384 | VirtIODevice *vdev = vq->vdev; |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 385 | hwaddr pa = offsetof(VRingUsed, flags); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 386 | uint16_t flags; |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 387 | |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 388 | if (!caches) { |
| 389 | return; |
| 390 | } |
| 391 | |
| 392 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 393 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags | mask); |
| 394 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 395 | } |
| 396 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 397 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 398 | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
| 399 | { |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 400 | VRingMemoryRegionCaches *caches = vring_get_region_caches(vq); |
Rusty Russell | cee3ca0 | 2014-06-24 19:40:16 +0200 | [diff] [blame] | 401 | VirtIODevice *vdev = vq->vdev; |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 402 | hwaddr pa = offsetof(VRingUsed, flags); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 403 | uint16_t flags; |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 404 | |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 405 | if (!caches) { |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 410 | virtio_stw_phys_cached(vdev, &caches->used, pa, flags & ~mask); |
| 411 | address_space_cache_invalidate(&caches->used, pa, sizeof(flags)); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 412 | } |
| 413 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 414 | /* Called within rcu_read_lock(). */ |
Michael S. Tsirkin | e9600c6 | 2015-02-16 22:35:46 +0100 | [diff] [blame] | 415 | static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val) |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 416 | { |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 417 | VRingMemoryRegionCaches *caches; |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 418 | hwaddr pa; |
Stefan Hajnoczi | 332fa82 | 2017-01-12 11:46:10 +0000 | [diff] [blame] | 419 | if (!vq->notification) { |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 420 | return; |
| 421 | } |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 422 | |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 423 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 424 | if (!caches) { |
| 425 | return; |
| 426 | } |
| 427 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 428 | pa = offsetof(VRingUsed, ring[vq->vring.num]); |
| 429 | virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val); |
Stefan Hajnoczi | 3cdf847 | 2017-02-22 16:37:33 +0000 | [diff] [blame] | 430 | address_space_cache_invalidate(&caches->used, pa, sizeof(val)); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 431 | } |
| 432 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 433 | static void virtio_queue_split_set_notification(VirtQueue *vq, int enable) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 434 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 435 | RCU_READ_LOCK_GUARD(); |
| 436 | |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 437 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
Michael S. Tsirkin | e9600c6 | 2015-02-16 22:35:46 +0100 | [diff] [blame] | 438 | vring_set_avail_event(vq, vring_avail_idx(vq)); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 439 | } else if (enable) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 440 | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 441 | } else { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 442 | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 443 | } |
Michael S. Tsirkin | 92045d8 | 2012-04-23 14:11:14 +0300 | [diff] [blame] | 444 | if (enable) { |
| 445 | /* Expose avail event/used flags before caller checks the avail idx. */ |
| 446 | smp_mb(); |
| 447 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 448 | } |
| 449 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 450 | static void virtio_queue_packed_set_notification(VirtQueue *vq, int enable) |
| 451 | { |
| 452 | uint16_t off_wrap; |
| 453 | VRingPackedDescEvent e; |
| 454 | VRingMemoryRegionCaches *caches; |
| 455 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 456 | RCU_READ_LOCK_GUARD(); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 457 | caches = vring_get_region_caches(vq); |
| 458 | if (!caches) { |
| 459 | return; |
| 460 | } |
| 461 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 462 | vring_packed_event_read(vq->vdev, &caches->used, &e); |
| 463 | |
| 464 | if (!enable) { |
| 465 | e.flags = VRING_PACKED_EVENT_FLAG_DISABLE; |
| 466 | } else if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) { |
| 467 | off_wrap = vq->shadow_avail_idx | vq->shadow_avail_wrap_counter << 15; |
| 468 | vring_packed_off_wrap_write(vq->vdev, &caches->used, off_wrap); |
| 469 | /* Make sure off_wrap is wrote before flags */ |
| 470 | smp_wmb(); |
| 471 | e.flags = VRING_PACKED_EVENT_FLAG_DESC; |
| 472 | } else { |
| 473 | e.flags = VRING_PACKED_EVENT_FLAG_ENABLE; |
| 474 | } |
| 475 | |
| 476 | vring_packed_flags_write(vq->vdev, &caches->used, e.flags); |
| 477 | if (enable) { |
| 478 | /* Expose avail event/used flags before caller checks the avail idx. */ |
| 479 | smp_mb(); |
| 480 | } |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 481 | } |
| 482 | |
Stefan Hajnoczi | d0435bc | 2019-12-09 21:09:57 +0000 | [diff] [blame] | 483 | bool virtio_queue_get_notification(VirtQueue *vq) |
| 484 | { |
| 485 | return vq->notification; |
| 486 | } |
| 487 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 488 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
| 489 | { |
| 490 | vq->notification = enable; |
| 491 | |
| 492 | if (!vq->vring.desc) { |
| 493 | return; |
| 494 | } |
| 495 | |
| 496 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 497 | virtio_queue_packed_set_notification(vq, enable); |
| 498 | } else { |
| 499 | virtio_queue_split_set_notification(vq, enable); |
| 500 | } |
| 501 | } |
| 502 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 503 | int virtio_queue_ready(VirtQueue *vq) |
| 504 | { |
| 505 | return vq->vring.avail != 0; |
| 506 | } |
| 507 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 508 | static void vring_packed_desc_read_flags(VirtIODevice *vdev, |
| 509 | uint16_t *flags, |
| 510 | MemoryRegionCache *cache, |
| 511 | int i) |
| 512 | { |
| 513 | address_space_read_cached(cache, |
| 514 | i * sizeof(VRingPackedDesc) + |
| 515 | offsetof(VRingPackedDesc, flags), |
| 516 | flags, sizeof(*flags)); |
| 517 | virtio_tswap16s(vdev, flags); |
| 518 | } |
| 519 | |
| 520 | static void vring_packed_desc_read(VirtIODevice *vdev, |
| 521 | VRingPackedDesc *desc, |
| 522 | MemoryRegionCache *cache, |
| 523 | int i, bool strict_order) |
| 524 | { |
| 525 | hwaddr off = i * sizeof(VRingPackedDesc); |
| 526 | |
| 527 | vring_packed_desc_read_flags(vdev, &desc->flags, cache, i); |
| 528 | |
| 529 | if (strict_order) { |
| 530 | /* Make sure flags is read before the rest fields. */ |
| 531 | smp_rmb(); |
| 532 | } |
| 533 | |
| 534 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, addr), |
| 535 | &desc->addr, sizeof(desc->addr)); |
| 536 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, id), |
| 537 | &desc->id, sizeof(desc->id)); |
| 538 | address_space_read_cached(cache, off + offsetof(VRingPackedDesc, len), |
| 539 | &desc->len, sizeof(desc->len)); |
| 540 | virtio_tswap64s(vdev, &desc->addr); |
| 541 | virtio_tswap16s(vdev, &desc->id); |
| 542 | virtio_tswap32s(vdev, &desc->len); |
| 543 | } |
| 544 | |
| 545 | static void vring_packed_desc_write_data(VirtIODevice *vdev, |
| 546 | VRingPackedDesc *desc, |
| 547 | MemoryRegionCache *cache, |
| 548 | int i) |
| 549 | { |
| 550 | hwaddr off_id = i * sizeof(VRingPackedDesc) + |
| 551 | offsetof(VRingPackedDesc, id); |
| 552 | hwaddr off_len = i * sizeof(VRingPackedDesc) + |
| 553 | offsetof(VRingPackedDesc, len); |
| 554 | |
| 555 | virtio_tswap32s(vdev, &desc->len); |
| 556 | virtio_tswap16s(vdev, &desc->id); |
| 557 | address_space_write_cached(cache, off_id, &desc->id, sizeof(desc->id)); |
| 558 | address_space_cache_invalidate(cache, off_id, sizeof(desc->id)); |
| 559 | address_space_write_cached(cache, off_len, &desc->len, sizeof(desc->len)); |
| 560 | address_space_cache_invalidate(cache, off_len, sizeof(desc->len)); |
| 561 | } |
| 562 | |
| 563 | static void vring_packed_desc_write_flags(VirtIODevice *vdev, |
| 564 | VRingPackedDesc *desc, |
| 565 | MemoryRegionCache *cache, |
| 566 | int i) |
| 567 | { |
| 568 | hwaddr off = i * sizeof(VRingPackedDesc) + offsetof(VRingPackedDesc, flags); |
| 569 | |
| 570 | virtio_tswap16s(vdev, &desc->flags); |
| 571 | address_space_write_cached(cache, off, &desc->flags, sizeof(desc->flags)); |
| 572 | address_space_cache_invalidate(cache, off, sizeof(desc->flags)); |
| 573 | } |
| 574 | |
| 575 | static void vring_packed_desc_write(VirtIODevice *vdev, |
| 576 | VRingPackedDesc *desc, |
| 577 | MemoryRegionCache *cache, |
| 578 | int i, bool strict_order) |
| 579 | { |
| 580 | vring_packed_desc_write_data(vdev, desc, cache, i); |
| 581 | if (strict_order) { |
| 582 | /* Make sure data is wrote before flags. */ |
| 583 | smp_wmb(); |
| 584 | } |
| 585 | vring_packed_desc_write_flags(vdev, desc, cache, i); |
| 586 | } |
| 587 | |
| 588 | static inline bool is_desc_avail(uint16_t flags, bool wrap_counter) |
| 589 | { |
| 590 | bool avail, used; |
| 591 | |
| 592 | avail = !!(flags & (1 << VRING_PACKED_DESC_F_AVAIL)); |
| 593 | used = !!(flags & (1 << VRING_PACKED_DESC_F_USED)); |
| 594 | return (avail != used) && (avail == wrap_counter); |
| 595 | } |
| 596 | |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 597 | /* Fetch avail_idx from VQ memory only when we really need to know if |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 598 | * guest has added some buffers. |
| 599 | * Called within rcu_read_lock(). */ |
| 600 | static int virtio_queue_empty_rcu(VirtQueue *vq) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 601 | { |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 602 | if (virtio_device_disabled(vq->vdev)) { |
Fam Zheng | 2d1df85 | 2018-09-10 22:56:15 +0800 | [diff] [blame] | 603 | return 1; |
| 604 | } |
| 605 | |
Jason Wang | 168e4af | 2017-03-15 19:48:30 +0800 | [diff] [blame] | 606 | if (unlikely(!vq->vring.avail)) { |
| 607 | return 1; |
| 608 | } |
| 609 | |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 610 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
| 611 | return 0; |
| 612 | } |
| 613 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 614 | return vring_avail_idx(vq) == vq->last_avail_idx; |
| 615 | } |
| 616 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 617 | static int virtio_queue_split_empty(VirtQueue *vq) |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 618 | { |
| 619 | bool empty; |
| 620 | |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 621 | if (virtio_device_disabled(vq->vdev)) { |
Fam Zheng | 2d1df85 | 2018-09-10 22:56:15 +0800 | [diff] [blame] | 622 | return 1; |
| 623 | } |
| 624 | |
Jason Wang | 168e4af | 2017-03-15 19:48:30 +0800 | [diff] [blame] | 625 | if (unlikely(!vq->vring.avail)) { |
| 626 | return 1; |
| 627 | } |
| 628 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 629 | if (vq->shadow_avail_idx != vq->last_avail_idx) { |
| 630 | return 0; |
| 631 | } |
| 632 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 633 | RCU_READ_LOCK_GUARD(); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 634 | empty = vring_avail_idx(vq) == vq->last_avail_idx; |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 635 | return empty; |
| 636 | } |
| 637 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 638 | static int virtio_queue_packed_empty_rcu(VirtQueue *vq) |
| 639 | { |
| 640 | struct VRingPackedDesc desc; |
| 641 | VRingMemoryRegionCaches *cache; |
| 642 | |
| 643 | if (unlikely(!vq->vring.desc)) { |
| 644 | return 1; |
| 645 | } |
| 646 | |
| 647 | cache = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 648 | if (!cache) { |
| 649 | return 1; |
| 650 | } |
| 651 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 652 | vring_packed_desc_read_flags(vq->vdev, &desc.flags, &cache->desc, |
| 653 | vq->last_avail_idx); |
| 654 | |
| 655 | return !is_desc_avail(desc.flags, vq->last_avail_wrap_counter); |
| 656 | } |
| 657 | |
| 658 | static int virtio_queue_packed_empty(VirtQueue *vq) |
| 659 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 660 | RCU_READ_LOCK_GUARD(); |
| 661 | return virtio_queue_packed_empty_rcu(vq); |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | int virtio_queue_empty(VirtQueue *vq) |
| 665 | { |
| 666 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 667 | return virtio_queue_packed_empty(vq); |
| 668 | } else { |
| 669 | return virtio_queue_split_empty(vq); |
| 670 | } |
| 671 | } |
| 672 | |
Jason Wang | ce31746 | 2015-09-25 13:21:28 +0800 | [diff] [blame] | 673 | static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, |
| 674 | unsigned int len) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 675 | { |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 676 | AddressSpace *dma_as = vq->vdev->dma_as; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 677 | unsigned int offset; |
| 678 | int i; |
| 679 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 680 | offset = 0; |
| 681 | for (i = 0; i < elem->in_num; i++) { |
| 682 | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
| 683 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 684 | dma_memory_unmap(dma_as, elem->in_sg[i].iov_base, |
| 685 | elem->in_sg[i].iov_len, |
| 686 | DMA_DIRECTION_FROM_DEVICE, size); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 687 | |
Michael S. Tsirkin | 0cea71a | 2012-09-24 15:09:30 +0200 | [diff] [blame] | 688 | offset += size; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 689 | } |
| 690 | |
aliguori | 26b258e | 2009-03-28 17:46:18 +0000 | [diff] [blame] | 691 | for (i = 0; i < elem->out_num; i++) |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 692 | dma_memory_unmap(dma_as, elem->out_sg[i].iov_base, |
| 693 | elem->out_sg[i].iov_len, |
| 694 | DMA_DIRECTION_TO_DEVICE, |
| 695 | elem->out_sg[i].iov_len); |
Jason Wang | ce31746 | 2015-09-25 13:21:28 +0800 | [diff] [blame] | 696 | } |
| 697 | |
Stefan Hajnoczi | 2640d2a | 2016-09-19 14:28:03 +0100 | [diff] [blame] | 698 | /* virtqueue_detach_element: |
| 699 | * @vq: The #VirtQueue |
| 700 | * @elem: The #VirtQueueElement |
| 701 | * @len: number of bytes written |
| 702 | * |
| 703 | * Detach the element from the virtqueue. This function is suitable for device |
| 704 | * reset or other situations where a #VirtQueueElement is simply freed and will |
| 705 | * not be pushed or discarded. |
| 706 | */ |
| 707 | void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, |
| 708 | unsigned int len) |
| 709 | { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 710 | vq->inuse -= elem->ndescs; |
Stefan Hajnoczi | 2640d2a | 2016-09-19 14:28:03 +0100 | [diff] [blame] | 711 | virtqueue_unmap_sg(vq, elem, len); |
| 712 | } |
| 713 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 714 | static void virtqueue_split_rewind(VirtQueue *vq, unsigned int num) |
| 715 | { |
| 716 | vq->last_avail_idx -= num; |
| 717 | } |
| 718 | |
| 719 | static void virtqueue_packed_rewind(VirtQueue *vq, unsigned int num) |
| 720 | { |
| 721 | if (vq->last_avail_idx < num) { |
| 722 | vq->last_avail_idx = vq->vring.num + vq->last_avail_idx - num; |
| 723 | vq->last_avail_wrap_counter ^= 1; |
| 724 | } else { |
| 725 | vq->last_avail_idx -= num; |
| 726 | } |
| 727 | } |
| 728 | |
Ladi Prosek | 27e57ef | 2016-11-03 09:55:49 +0100 | [diff] [blame] | 729 | /* virtqueue_unpop: |
Stefan Hajnoczi | 2640d2a | 2016-09-19 14:28:03 +0100 | [diff] [blame] | 730 | * @vq: The #VirtQueue |
| 731 | * @elem: The #VirtQueueElement |
| 732 | * @len: number of bytes written |
| 733 | * |
| 734 | * Pretend the most recent element wasn't popped from the virtqueue. The next |
| 735 | * call to virtqueue_pop() will refetch the element. |
| 736 | */ |
Ladi Prosek | 27e57ef | 2016-11-03 09:55:49 +0100 | [diff] [blame] | 737 | void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, |
| 738 | unsigned int len) |
Jason Wang | 29b9f5e | 2015-09-25 13:21:29 +0800 | [diff] [blame] | 739 | { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 740 | |
| 741 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 742 | virtqueue_packed_rewind(vq, 1); |
| 743 | } else { |
| 744 | virtqueue_split_rewind(vq, 1); |
| 745 | } |
| 746 | |
Stefan Hajnoczi | 2640d2a | 2016-09-19 14:28:03 +0100 | [diff] [blame] | 747 | virtqueue_detach_element(vq, elem, len); |
Jason Wang | 29b9f5e | 2015-09-25 13:21:29 +0800 | [diff] [blame] | 748 | } |
| 749 | |
Stefan Hajnoczi | 297a75e | 2016-09-07 17:20:48 +0200 | [diff] [blame] | 750 | /* virtqueue_rewind: |
| 751 | * @vq: The #VirtQueue |
| 752 | * @num: Number of elements to push back |
| 753 | * |
| 754 | * Pretend that elements weren't popped from the virtqueue. The next |
| 755 | * virtqueue_pop() will refetch the oldest element. |
| 756 | * |
Ladi Prosek | 27e57ef | 2016-11-03 09:55:49 +0100 | [diff] [blame] | 757 | * Use virtqueue_unpop() instead if you have a VirtQueueElement. |
Stefan Hajnoczi | 297a75e | 2016-09-07 17:20:48 +0200 | [diff] [blame] | 758 | * |
| 759 | * Returns: true on success, false if @num is greater than the number of in use |
| 760 | * elements. |
| 761 | */ |
| 762 | bool virtqueue_rewind(VirtQueue *vq, unsigned int num) |
| 763 | { |
| 764 | if (num > vq->inuse) { |
| 765 | return false; |
| 766 | } |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 767 | |
Stefan Hajnoczi | 297a75e | 2016-09-07 17:20:48 +0200 | [diff] [blame] | 768 | vq->inuse -= num; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 769 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 770 | virtqueue_packed_rewind(vq, num); |
| 771 | } else { |
| 772 | virtqueue_split_rewind(vq, num); |
| 773 | } |
Stefan Hajnoczi | 297a75e | 2016-09-07 17:20:48 +0200 | [diff] [blame] | 774 | return true; |
| 775 | } |
| 776 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 777 | static void virtqueue_split_fill(VirtQueue *vq, const VirtQueueElement *elem, |
Jason Wang | ce31746 | 2015-09-25 13:21:28 +0800 | [diff] [blame] | 778 | unsigned int len, unsigned int idx) |
| 779 | { |
Vincenzo Maffione | 1cdd2ee | 2016-01-31 11:29:06 +0100 | [diff] [blame] | 780 | VRingUsedElem uelem; |
| 781 | |
Jason Wang | 168e4af | 2017-03-15 19:48:30 +0800 | [diff] [blame] | 782 | if (unlikely(!vq->vring.used)) { |
| 783 | return; |
| 784 | } |
| 785 | |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 786 | idx = (idx + vq->used_idx) % vq->vring.num; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 787 | |
Vincenzo Maffione | 1cdd2ee | 2016-01-31 11:29:06 +0100 | [diff] [blame] | 788 | uelem.id = elem->index; |
| 789 | uelem.len = len; |
| 790 | vring_used_write(vq, &uelem, idx); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 791 | } |
| 792 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 793 | static void virtqueue_packed_fill(VirtQueue *vq, const VirtQueueElement *elem, |
| 794 | unsigned int len, unsigned int idx) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 795 | { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 796 | vq->used_elems[idx].index = elem->index; |
| 797 | vq->used_elems[idx].len = len; |
| 798 | vq->used_elems[idx].ndescs = elem->ndescs; |
| 799 | } |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 800 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 801 | static void virtqueue_packed_fill_desc(VirtQueue *vq, |
| 802 | const VirtQueueElement *elem, |
| 803 | unsigned int idx, |
| 804 | bool strict_order) |
| 805 | { |
| 806 | uint16_t head; |
| 807 | VRingMemoryRegionCaches *caches; |
| 808 | VRingPackedDesc desc = { |
| 809 | .id = elem->index, |
| 810 | .len = elem->len, |
| 811 | }; |
| 812 | bool wrap_counter = vq->used_wrap_counter; |
| 813 | |
| 814 | if (unlikely(!vq->vring.desc)) { |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 815 | return; |
| 816 | } |
| 817 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 818 | head = vq->used_idx + idx; |
| 819 | if (head >= vq->vring.num) { |
| 820 | head -= vq->vring.num; |
| 821 | wrap_counter ^= 1; |
| 822 | } |
| 823 | if (wrap_counter) { |
| 824 | desc.flags |= (1 << VRING_PACKED_DESC_F_AVAIL); |
| 825 | desc.flags |= (1 << VRING_PACKED_DESC_F_USED); |
| 826 | } else { |
| 827 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_AVAIL); |
| 828 | desc.flags &= ~(1 << VRING_PACKED_DESC_F_USED); |
| 829 | } |
| 830 | |
| 831 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 832 | if (!caches) { |
| 833 | return; |
| 834 | } |
| 835 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 836 | vring_packed_desc_write(vq->vdev, &desc, &caches->desc, head, strict_order); |
| 837 | } |
| 838 | |
| 839 | /* Called within rcu_read_lock(). */ |
| 840 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
| 841 | unsigned int len, unsigned int idx) |
| 842 | { |
| 843 | trace_virtqueue_fill(vq, elem, len, idx); |
| 844 | |
| 845 | virtqueue_unmap_sg(vq, elem, len); |
| 846 | |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 847 | if (virtio_device_disabled(vq->vdev)) { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 848 | return; |
| 849 | } |
| 850 | |
| 851 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 852 | virtqueue_packed_fill(vq, elem, len, idx); |
| 853 | } else { |
| 854 | virtqueue_split_fill(vq, elem, len, idx); |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | /* Called within rcu_read_lock(). */ |
| 859 | static void virtqueue_split_flush(VirtQueue *vq, unsigned int count) |
| 860 | { |
| 861 | uint16_t old, new; |
| 862 | |
Jason Wang | 168e4af | 2017-03-15 19:48:30 +0800 | [diff] [blame] | 863 | if (unlikely(!vq->vring.used)) { |
| 864 | return; |
| 865 | } |
| 866 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 867 | /* Make sure buffer is written before we update index. */ |
David Gibson | b90d2f3 | 2011-09-20 12:05:20 +1000 | [diff] [blame] | 868 | smp_wmb(); |
Stefan Hajnoczi | 64979a4 | 2010-05-24 13:19:21 +0100 | [diff] [blame] | 869 | trace_virtqueue_flush(vq, count); |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 870 | old = vq->used_idx; |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 871 | new = old + count; |
| 872 | vring_used_idx_set(vq, new); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 873 | vq->inuse -= count; |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 874 | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) |
| 875 | vq->signalled_used_valid = false; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 876 | } |
| 877 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 878 | static void virtqueue_packed_flush(VirtQueue *vq, unsigned int count) |
| 879 | { |
| 880 | unsigned int i, ndescs = 0; |
| 881 | |
| 882 | if (unlikely(!vq->vring.desc)) { |
| 883 | return; |
| 884 | } |
| 885 | |
| 886 | for (i = 1; i < count; i++) { |
| 887 | virtqueue_packed_fill_desc(vq, &vq->used_elems[i], i, false); |
| 888 | ndescs += vq->used_elems[i].ndescs; |
| 889 | } |
| 890 | virtqueue_packed_fill_desc(vq, &vq->used_elems[0], 0, true); |
| 891 | ndescs += vq->used_elems[0].ndescs; |
| 892 | |
| 893 | vq->inuse -= ndescs; |
| 894 | vq->used_idx += ndescs; |
| 895 | if (vq->used_idx >= vq->vring.num) { |
| 896 | vq->used_idx -= vq->vring.num; |
| 897 | vq->used_wrap_counter ^= 1; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | void virtqueue_flush(VirtQueue *vq, unsigned int count) |
| 902 | { |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 903 | if (virtio_device_disabled(vq->vdev)) { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 904 | vq->inuse -= count; |
| 905 | return; |
| 906 | } |
| 907 | |
| 908 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 909 | virtqueue_packed_flush(vq, count); |
| 910 | } else { |
| 911 | virtqueue_split_flush(vq, count); |
| 912 | } |
| 913 | } |
| 914 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 915 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
| 916 | unsigned int len) |
| 917 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 918 | RCU_READ_LOCK_GUARD(); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 919 | virtqueue_fill(vq, elem, len, 0); |
| 920 | virtqueue_flush(vq, 1); |
| 921 | } |
| 922 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 923 | /* Called within rcu_read_lock(). */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 924 | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
| 925 | { |
| 926 | uint16_t num_heads = vring_avail_idx(vq) - idx; |
| 927 | |
| 928 | /* Check it isn't doing very strange things with descriptor numbers. */ |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 929 | if (num_heads > vq->vring.num) { |
Stefan Hajnoczi | 4355c1a | 2016-09-21 16:52:25 +0100 | [diff] [blame] | 930 | virtio_error(vq->vdev, "Guest moved used index from %u to %u", |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 931 | idx, vq->shadow_avail_idx); |
Stefan Hajnoczi | 4355c1a | 2016-09-21 16:52:25 +0100 | [diff] [blame] | 932 | return -EINVAL; |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 933 | } |
Michael S. Tsirkin | a821ce5 | 2012-04-23 15:46:22 +0300 | [diff] [blame] | 934 | /* On success, callers read a descriptor at vq->last_avail_idx. |
| 935 | * Make sure descriptor read does not bypass avail index read. */ |
| 936 | if (num_heads) { |
| 937 | smp_rmb(); |
| 938 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 939 | |
| 940 | return num_heads; |
| 941 | } |
| 942 | |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 943 | /* Called within rcu_read_lock(). */ |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 944 | static bool virtqueue_get_head(VirtQueue *vq, unsigned int idx, |
| 945 | unsigned int *head) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 946 | { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 947 | /* Grab the next descriptor number they're advertising, and increment |
| 948 | * the index we've seen. */ |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 949 | *head = vring_avail_ring(vq, idx % vq->vring.num); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 950 | |
| 951 | /* If their number is silly, that's a fatal mistake. */ |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 952 | if (*head >= vq->vring.num) { |
| 953 | virtio_error(vq->vdev, "Guest says index %u is available", *head); |
| 954 | return false; |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 955 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 956 | |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 957 | return true; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 958 | } |
| 959 | |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 960 | enum { |
| 961 | VIRTQUEUE_READ_DESC_ERROR = -1, |
| 962 | VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */ |
| 963 | VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */ |
| 964 | }; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 965 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 966 | static int virtqueue_split_read_next_desc(VirtIODevice *vdev, VRingDesc *desc, |
| 967 | MemoryRegionCache *desc_cache, |
| 968 | unsigned int max, unsigned int *next) |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 969 | { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 970 | /* If this descriptor says it doesn't chain, we're done. */ |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 971 | if (!(desc->flags & VRING_DESC_F_NEXT)) { |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 972 | return VIRTQUEUE_READ_DESC_DONE; |
Rusty Russell | cee3ca0 | 2014-06-24 19:40:16 +0200 | [diff] [blame] | 973 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 974 | |
| 975 | /* Check they're not leading us off end of descriptors. */ |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 976 | *next = desc->next; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 977 | /* Make sure compiler knows to grab that: we don't want it changing! */ |
David Gibson | b90d2f3 | 2011-09-20 12:05:20 +1000 | [diff] [blame] | 978 | smp_wmb(); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 979 | |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 980 | if (*next >= max) { |
| 981 | virtio_error(vdev, "Desc next is %u", *next); |
| 982 | return VIRTQUEUE_READ_DESC_ERROR; |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 983 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 984 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 985 | vring_split_desc_read(vdev, desc, desc_cache, *next); |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 986 | return VIRTQUEUE_READ_DESC_MORE; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 987 | } |
| 988 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 989 | static void virtqueue_split_get_avail_bytes(VirtQueue *vq, |
| 990 | unsigned int *in_bytes, unsigned int *out_bytes, |
| 991 | unsigned max_in_bytes, unsigned max_out_bytes) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 992 | { |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 993 | VirtIODevice *vdev = vq->vdev; |
| 994 | unsigned int max, idx; |
Amit Shah | 385ce95 | 2012-09-25 00:05:14 +0530 | [diff] [blame] | 995 | unsigned int total_bufs, in_total, out_total; |
Paolo Bonzini | 991976f | 2017-01-27 16:40:18 +0100 | [diff] [blame] | 996 | VRingMemoryRegionCaches *caches; |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 997 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
| 998 | int64_t len = 0; |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 999 | int rc; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1000 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 1001 | RCU_READ_LOCK_GUARD(); |
| 1002 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1003 | idx = vq->last_avail_idx; |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1004 | total_bufs = in_total = out_total = 0; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1005 | |
| 1006 | max = vq->vring.num; |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 1007 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 1008 | if (!caches) { |
| 1009 | goto err; |
| 1010 | } |
| 1011 | |
Stefan Hajnoczi | 4355c1a | 2016-09-21 16:52:25 +0100 | [diff] [blame] | 1012 | while ((rc = virtqueue_num_heads(vq, idx)) > 0) { |
Paolo Bonzini | 991976f | 2017-01-27 16:40:18 +0100 | [diff] [blame] | 1013 | MemoryRegionCache *desc_cache = &caches->desc; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1014 | unsigned int num_bufs; |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1015 | VRingDesc desc; |
Stefan Hajnoczi | b1c7c07 | 2016-09-21 16:52:23 +0100 | [diff] [blame] | 1016 | unsigned int i; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1017 | |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1018 | num_bufs = total_bufs; |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 1019 | |
| 1020 | if (!virtqueue_get_head(vq, idx++, &i)) { |
| 1021 | goto err; |
| 1022 | } |
| 1023 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1024 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1025 | |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1026 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
Dima Stepanov | 7423192 | 2019-01-15 13:08:47 +0300 | [diff] [blame] | 1027 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
Stefan Hajnoczi | d65abf8 | 2016-09-21 16:52:22 +0100 | [diff] [blame] | 1028 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
| 1029 | goto err; |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1030 | } |
| 1031 | |
| 1032 | /* If we've got too many, that implies a descriptor loop. */ |
| 1033 | if (num_bufs >= max) { |
Stefan Hajnoczi | d65abf8 | 2016-09-21 16:52:22 +0100 | [diff] [blame] | 1034 | virtio_error(vdev, "Looped descriptor"); |
| 1035 | goto err; |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1036 | } |
| 1037 | |
| 1038 | /* loop over the indirect descriptor table */ |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 1039 | len = address_space_cache_init(&indirect_desc_cache, |
| 1040 | vdev->dma_as, |
| 1041 | desc.addr, desc.len, false); |
| 1042 | desc_cache = &indirect_desc_cache; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1043 | if (len < desc.len) { |
| 1044 | virtio_error(vdev, "Cannot map indirect buffer"); |
| 1045 | goto err; |
| 1046 | } |
| 1047 | |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1048 | max = desc.len / sizeof(VRingDesc); |
yinyin | 1ae2757 | 2013-08-22 14:47:16 +0800 | [diff] [blame] | 1049 | num_bufs = i = 0; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1050 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1051 | } |
| 1052 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1053 | do { |
| 1054 | /* If we've got too many, that implies a descriptor loop. */ |
Mark McLoughlin | 5774cf9 | 2009-06-17 11:37:32 +0100 | [diff] [blame] | 1055 | if (++num_bufs > max) { |
Stefan Hajnoczi | d65abf8 | 2016-09-21 16:52:22 +0100 | [diff] [blame] | 1056 | virtio_error(vdev, "Looped descriptor"); |
| 1057 | goto err; |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 1058 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1059 | |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1060 | if (desc.flags & VRING_DESC_F_WRITE) { |
| 1061 | in_total += desc.len; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1062 | } else { |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1063 | out_total += desc.len; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1064 | } |
Michael S. Tsirkin | e1f7b48 | 2012-11-30 00:02:56 +0200 | [diff] [blame] | 1065 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
| 1066 | goto done; |
| 1067 | } |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 1068 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1069 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 1070 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
| 1071 | |
| 1072 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { |
| 1073 | goto err; |
| 1074 | } |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1075 | |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 1076 | if (desc_cache == &indirect_desc_cache) { |
| 1077 | address_space_cache_destroy(&indirect_desc_cache); |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1078 | total_bufs++; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1079 | } else { |
| 1080 | total_bufs = num_bufs; |
| 1081 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1082 | } |
Stefan Hajnoczi | 4355c1a | 2016-09-21 16:52:25 +0100 | [diff] [blame] | 1083 | |
| 1084 | if (rc < 0) { |
| 1085 | goto err; |
| 1086 | } |
| 1087 | |
Michael S. Tsirkin | e1f7b48 | 2012-11-30 00:02:56 +0200 | [diff] [blame] | 1088 | done: |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 1089 | address_space_cache_destroy(&indirect_desc_cache); |
Amit Shah | 0d8d769 | 2012-09-25 00:05:15 +0530 | [diff] [blame] | 1090 | if (in_bytes) { |
| 1091 | *in_bytes = in_total; |
| 1092 | } |
| 1093 | if (out_bytes) { |
| 1094 | *out_bytes = out_total; |
| 1095 | } |
Stefan Hajnoczi | d65abf8 | 2016-09-21 16:52:22 +0100 | [diff] [blame] | 1096 | return; |
| 1097 | |
| 1098 | err: |
| 1099 | in_total = out_total = 0; |
| 1100 | goto done; |
Amit Shah | 0d8d769 | 2012-09-25 00:05:15 +0530 | [diff] [blame] | 1101 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1102 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1103 | static int virtqueue_packed_read_next_desc(VirtQueue *vq, |
| 1104 | VRingPackedDesc *desc, |
| 1105 | MemoryRegionCache |
| 1106 | *desc_cache, |
| 1107 | unsigned int max, |
| 1108 | unsigned int *next, |
| 1109 | bool indirect) |
| 1110 | { |
| 1111 | /* If this descriptor says it doesn't chain, we're done. */ |
| 1112 | if (!indirect && !(desc->flags & VRING_DESC_F_NEXT)) { |
| 1113 | return VIRTQUEUE_READ_DESC_DONE; |
| 1114 | } |
| 1115 | |
| 1116 | ++*next; |
| 1117 | if (*next == max) { |
| 1118 | if (indirect) { |
| 1119 | return VIRTQUEUE_READ_DESC_DONE; |
| 1120 | } else { |
| 1121 | (*next) -= vq->vring.num; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | vring_packed_desc_read(vq->vdev, desc, desc_cache, *next, false); |
| 1126 | return VIRTQUEUE_READ_DESC_MORE; |
| 1127 | } |
| 1128 | |
| 1129 | static void virtqueue_packed_get_avail_bytes(VirtQueue *vq, |
| 1130 | unsigned int *in_bytes, |
| 1131 | unsigned int *out_bytes, |
| 1132 | unsigned max_in_bytes, |
| 1133 | unsigned max_out_bytes) |
| 1134 | { |
| 1135 | VirtIODevice *vdev = vq->vdev; |
| 1136 | unsigned int max, idx; |
| 1137 | unsigned int total_bufs, in_total, out_total; |
| 1138 | MemoryRegionCache *desc_cache; |
| 1139 | VRingMemoryRegionCaches *caches; |
| 1140 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
| 1141 | int64_t len = 0; |
| 1142 | VRingPackedDesc desc; |
| 1143 | bool wrap_counter; |
| 1144 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 1145 | RCU_READ_LOCK_GUARD(); |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1146 | idx = vq->last_avail_idx; |
| 1147 | wrap_counter = vq->last_avail_wrap_counter; |
| 1148 | total_bufs = in_total = out_total = 0; |
| 1149 | |
| 1150 | max = vq->vring.num; |
| 1151 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 1152 | if (!caches) { |
| 1153 | goto err; |
| 1154 | } |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1155 | |
| 1156 | for (;;) { |
| 1157 | unsigned int num_bufs = total_bufs; |
| 1158 | unsigned int i = idx; |
| 1159 | int rc; |
| 1160 | |
| 1161 | desc_cache = &caches->desc; |
| 1162 | vring_packed_desc_read(vdev, &desc, desc_cache, idx, true); |
| 1163 | if (!is_desc_avail(desc.flags, wrap_counter)) { |
| 1164 | break; |
| 1165 | } |
| 1166 | |
| 1167 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
| 1168 | if (desc.len % sizeof(VRingPackedDesc)) { |
| 1169 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
| 1170 | goto err; |
| 1171 | } |
| 1172 | |
| 1173 | /* If we've got too many, that implies a descriptor loop. */ |
| 1174 | if (num_bufs >= max) { |
| 1175 | virtio_error(vdev, "Looped descriptor"); |
| 1176 | goto err; |
| 1177 | } |
| 1178 | |
| 1179 | /* loop over the indirect descriptor table */ |
| 1180 | len = address_space_cache_init(&indirect_desc_cache, |
| 1181 | vdev->dma_as, |
| 1182 | desc.addr, desc.len, false); |
| 1183 | desc_cache = &indirect_desc_cache; |
| 1184 | if (len < desc.len) { |
| 1185 | virtio_error(vdev, "Cannot map indirect buffer"); |
| 1186 | goto err; |
| 1187 | } |
| 1188 | |
| 1189 | max = desc.len / sizeof(VRingPackedDesc); |
| 1190 | num_bufs = i = 0; |
| 1191 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); |
| 1192 | } |
| 1193 | |
| 1194 | do { |
| 1195 | /* If we've got too many, that implies a descriptor loop. */ |
| 1196 | if (++num_bufs > max) { |
| 1197 | virtio_error(vdev, "Looped descriptor"); |
| 1198 | goto err; |
| 1199 | } |
| 1200 | |
| 1201 | if (desc.flags & VRING_DESC_F_WRITE) { |
| 1202 | in_total += desc.len; |
| 1203 | } else { |
| 1204 | out_total += desc.len; |
| 1205 | } |
| 1206 | if (in_total >= max_in_bytes && out_total >= max_out_bytes) { |
| 1207 | goto done; |
| 1208 | } |
| 1209 | |
| 1210 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, |
| 1211 | &i, desc_cache == |
| 1212 | &indirect_desc_cache); |
| 1213 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
| 1214 | |
| 1215 | if (desc_cache == &indirect_desc_cache) { |
| 1216 | address_space_cache_destroy(&indirect_desc_cache); |
| 1217 | total_bufs++; |
| 1218 | idx++; |
| 1219 | } else { |
| 1220 | idx += num_bufs - total_bufs; |
| 1221 | total_bufs = num_bufs; |
| 1222 | } |
| 1223 | |
| 1224 | if (idx >= vq->vring.num) { |
| 1225 | idx -= vq->vring.num; |
| 1226 | wrap_counter ^= 1; |
| 1227 | } |
| 1228 | } |
| 1229 | |
| 1230 | /* Record the index and wrap counter for a kick we want */ |
| 1231 | vq->shadow_avail_idx = idx; |
| 1232 | vq->shadow_avail_wrap_counter = wrap_counter; |
| 1233 | done: |
| 1234 | address_space_cache_destroy(&indirect_desc_cache); |
| 1235 | if (in_bytes) { |
| 1236 | *in_bytes = in_total; |
| 1237 | } |
| 1238 | if (out_bytes) { |
| 1239 | *out_bytes = out_total; |
| 1240 | } |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1241 | return; |
| 1242 | |
| 1243 | err: |
| 1244 | in_total = out_total = 0; |
| 1245 | goto done; |
| 1246 | } |
| 1247 | |
| 1248 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, |
| 1249 | unsigned int *out_bytes, |
| 1250 | unsigned max_in_bytes, unsigned max_out_bytes) |
| 1251 | { |
| 1252 | uint16_t desc_size; |
| 1253 | VRingMemoryRegionCaches *caches; |
| 1254 | |
| 1255 | if (unlikely(!vq->vring.desc)) { |
| 1256 | goto err; |
| 1257 | } |
| 1258 | |
| 1259 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 1260 | if (!caches) { |
| 1261 | goto err; |
| 1262 | } |
| 1263 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1264 | desc_size = virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED) ? |
| 1265 | sizeof(VRingPackedDesc) : sizeof(VRingDesc); |
| 1266 | if (caches->desc.len < vq->vring.num * desc_size) { |
| 1267 | virtio_error(vq->vdev, "Cannot map descriptor ring"); |
| 1268 | goto err; |
| 1269 | } |
| 1270 | |
| 1271 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 1272 | virtqueue_packed_get_avail_bytes(vq, in_bytes, out_bytes, |
| 1273 | max_in_bytes, max_out_bytes); |
| 1274 | } else { |
| 1275 | virtqueue_split_get_avail_bytes(vq, in_bytes, out_bytes, |
| 1276 | max_in_bytes, max_out_bytes); |
| 1277 | } |
| 1278 | |
| 1279 | return; |
| 1280 | err: |
| 1281 | if (in_bytes) { |
| 1282 | *in_bytes = 0; |
| 1283 | } |
| 1284 | if (out_bytes) { |
| 1285 | *out_bytes = 0; |
| 1286 | } |
| 1287 | } |
| 1288 | |
Amit Shah | 0d8d769 | 2012-09-25 00:05:15 +0530 | [diff] [blame] | 1289 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
| 1290 | unsigned int out_bytes) |
| 1291 | { |
| 1292 | unsigned int in_total, out_total; |
| 1293 | |
Michael S. Tsirkin | e1f7b48 | 2012-11-30 00:02:56 +0200 | [diff] [blame] | 1294 | virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); |
| 1295 | return in_bytes <= in_total && out_bytes <= out_total; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1296 | } |
| 1297 | |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1298 | static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg, |
| 1299 | hwaddr *addr, struct iovec *iov, |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1300 | unsigned int max_num_sg, bool is_write, |
| 1301 | hwaddr pa, size_t sz) |
| 1302 | { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1303 | bool ok = false; |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1304 | unsigned num_sg = *p_num_sg; |
| 1305 | assert(num_sg <= max_num_sg); |
| 1306 | |
Prasad J Pandit | 1e7aed7 | 2016-07-27 21:07:56 +0530 | [diff] [blame] | 1307 | if (!sz) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1308 | virtio_error(vdev, "virtio: zero sized buffers are not allowed"); |
| 1309 | goto out; |
Prasad J Pandit | 1e7aed7 | 2016-07-27 21:07:56 +0530 | [diff] [blame] | 1310 | } |
| 1311 | |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1312 | while (sz) { |
| 1313 | hwaddr len = sz; |
| 1314 | |
| 1315 | if (num_sg == max_num_sg) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1316 | virtio_error(vdev, "virtio: too many write descriptors in " |
| 1317 | "indirect table"); |
| 1318 | goto out; |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1319 | } |
| 1320 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1321 | iov[num_sg].iov_base = dma_memory_map(vdev->dma_as, pa, &len, |
| 1322 | is_write ? |
| 1323 | DMA_DIRECTION_FROM_DEVICE : |
| 1324 | DMA_DIRECTION_TO_DEVICE); |
Prasad J Pandit | 973e717 | 2016-09-19 23:55:45 +0530 | [diff] [blame] | 1325 | if (!iov[num_sg].iov_base) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1326 | virtio_error(vdev, "virtio: bogus descriptor or out of resources"); |
| 1327 | goto out; |
Prasad J Pandit | 973e717 | 2016-09-19 23:55:45 +0530 | [diff] [blame] | 1328 | } |
| 1329 | |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1330 | iov[num_sg].iov_len = len; |
| 1331 | addr[num_sg] = pa; |
| 1332 | |
| 1333 | sz -= len; |
| 1334 | pa += len; |
| 1335 | num_sg++; |
| 1336 | } |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1337 | ok = true; |
| 1338 | |
| 1339 | out: |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1340 | *p_num_sg = num_sg; |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1341 | return ok; |
| 1342 | } |
| 1343 | |
| 1344 | /* Only used by error code paths before we have a VirtQueueElement (therefore |
| 1345 | * virtqueue_unmap_sg() can't be used). Assumes buffers weren't written to |
| 1346 | * yet. |
| 1347 | */ |
| 1348 | static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num, |
| 1349 | struct iovec *iov) |
| 1350 | { |
| 1351 | unsigned int i; |
| 1352 | |
| 1353 | for (i = 0; i < out_num + in_num; i++) { |
| 1354 | int is_write = i >= out_num; |
| 1355 | |
| 1356 | cpu_physical_memory_unmap(iov->iov_base, iov->iov_len, is_write, 0); |
| 1357 | iov++; |
| 1358 | } |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1359 | } |
| 1360 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1361 | static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg, |
Dongli Zhang | e4fbf5b | 2018-11-02 14:16:36 +0800 | [diff] [blame] | 1362 | hwaddr *addr, unsigned int num_sg, |
Philippe Mathieu-Daudé | 2295336 | 2020-02-19 19:19:53 +0100 | [diff] [blame] | 1363 | bool is_write) |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1364 | { |
| 1365 | unsigned int i; |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 1366 | hwaddr len; |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1367 | |
Dongli Zhang | e4fbf5b | 2018-11-02 14:16:36 +0800 | [diff] [blame] | 1368 | for (i = 0; i < num_sg; i++) { |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1369 | len = sg[i].iov_len; |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1370 | sg[i].iov_base = dma_memory_map(vdev->dma_as, |
| 1371 | addr[i], &len, is_write ? |
| 1372 | DMA_DIRECTION_FROM_DEVICE : |
| 1373 | DMA_DIRECTION_TO_DEVICE); |
Michael S. Tsirkin | 8059fee | 2015-10-27 10:01:44 +0200 | [diff] [blame] | 1374 | if (!sg[i].iov_base) { |
Michael Tokarev | 1a28589 | 2014-06-10 19:56:27 +0400 | [diff] [blame] | 1375 | error_report("virtio: error trying to map MMIO memory"); |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1376 | exit(1); |
| 1377 | } |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1378 | if (len != sg[i].iov_len) { |
| 1379 | error_report("virtio: unexpected memory split"); |
Michael S. Tsirkin | 8059fee | 2015-10-27 10:01:44 +0200 | [diff] [blame] | 1380 | exit(1); |
| 1381 | } |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1382 | } |
| 1383 | } |
| 1384 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1385 | void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem) |
Michael S. Tsirkin | 8059fee | 2015-10-27 10:01:44 +0200 | [diff] [blame] | 1386 | { |
Philippe Mathieu-Daudé | 2295336 | 2020-02-19 19:19:53 +0100 | [diff] [blame] | 1387 | virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, elem->in_num, true); |
| 1388 | virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, elem->out_num, |
| 1389 | false); |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1390 | } |
| 1391 | |
Ladi Prosek | bf91bd2 | 2016-11-03 09:55:50 +0100 | [diff] [blame] | 1392 | static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num) |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1393 | { |
| 1394 | VirtQueueElement *elem; |
| 1395 | size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0])); |
| 1396 | size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]); |
| 1397 | size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]); |
| 1398 | size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0])); |
| 1399 | size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]); |
| 1400 | size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]); |
| 1401 | |
| 1402 | assert(sz >= sizeof(VirtQueueElement)); |
| 1403 | elem = g_malloc(out_sg_end); |
Paolo Bonzini | b0ac429 | 2017-06-01 15:54:47 +0200 | [diff] [blame] | 1404 | trace_virtqueue_alloc_element(elem, sz, in_num, out_num); |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1405 | elem->out_num = out_num; |
| 1406 | elem->in_num = in_num; |
| 1407 | elem->in_addr = (void *)elem + in_addr_ofs; |
| 1408 | elem->out_addr = (void *)elem + out_addr_ofs; |
| 1409 | elem->in_sg = (void *)elem + in_sg_ofs; |
| 1410 | elem->out_sg = (void *)elem + out_sg_ofs; |
| 1411 | return elem; |
Michael S. Tsirkin | 8059fee | 2015-10-27 10:01:44 +0200 | [diff] [blame] | 1412 | } |
| 1413 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1414 | static void *virtqueue_split_pop(VirtQueue *vq, size_t sz) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1415 | { |
Mark McLoughlin | 5774cf9 | 2009-06-17 11:37:32 +0100 | [diff] [blame] | 1416 | unsigned int i, head, max; |
Paolo Bonzini | 991976f | 2017-01-27 16:40:18 +0100 | [diff] [blame] | 1417 | VRingMemoryRegionCaches *caches; |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 1418 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
| 1419 | MemoryRegionCache *desc_cache; |
| 1420 | int64_t len; |
Rusty Russell | cee3ca0 | 2014-06-24 19:40:16 +0200 | [diff] [blame] | 1421 | VirtIODevice *vdev = vq->vdev; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1422 | VirtQueueElement *elem = NULL; |
Wolfgang Bumiller | 37ef70b | 2017-09-20 08:09:33 +0200 | [diff] [blame] | 1423 | unsigned out_num, in_num, elem_entries; |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1424 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; |
| 1425 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1426 | VRingDesc desc; |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 1427 | int rc; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1428 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 1429 | RCU_READ_LOCK_GUARD(); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 1430 | if (virtio_queue_empty_rcu(vq)) { |
| 1431 | goto done; |
Paolo Bonzini | 51b19eb | 2016-02-04 16:26:51 +0200 | [diff] [blame] | 1432 | } |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 1433 | /* Needed after virtio_queue_empty(), see comment in |
| 1434 | * virtqueue_num_heads(). */ |
| 1435 | smp_rmb(); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1436 | |
| 1437 | /* When we start there are none of either input nor output. */ |
Wolfgang Bumiller | 37ef70b | 2017-09-20 08:09:33 +0200 | [diff] [blame] | 1438 | out_num = in_num = elem_entries = 0; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1439 | |
Mark McLoughlin | 5774cf9 | 2009-06-17 11:37:32 +0100 | [diff] [blame] | 1440 | max = vq->vring.num; |
| 1441 | |
Stefan Hajnoczi | afd9096 | 2016-07-19 13:07:13 +0100 | [diff] [blame] | 1442 | if (vq->inuse >= vq->vring.num) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1443 | virtio_error(vdev, "Virtqueue size exceeded"); |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 1444 | goto done; |
Stefan Hajnoczi | afd9096 | 2016-07-19 13:07:13 +0100 | [diff] [blame] | 1445 | } |
| 1446 | |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 1447 | if (!virtqueue_get_head(vq, vq->last_avail_idx++, &head)) { |
Paolo Bonzini | 97cd965 | 2017-01-27 16:40:20 +0100 | [diff] [blame] | 1448 | goto done; |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 1449 | } |
| 1450 | |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 1451 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
Michael S. Tsirkin | e9600c6 | 2015-02-16 22:35:46 +0100 | [diff] [blame] | 1452 | vring_set_avail_event(vq, vq->last_avail_idx); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 1453 | } |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1454 | |
Stefan Hajnoczi | fb1131b | 2016-09-21 16:52:26 +0100 | [diff] [blame] | 1455 | i = head; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1456 | |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 1457 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 1458 | if (!caches) { |
| 1459 | virtio_error(vdev, "Region caches not initialized"); |
| 1460 | goto done; |
| 1461 | } |
| 1462 | |
Paolo Bonzini | 991976f | 2017-01-27 16:40:18 +0100 | [diff] [blame] | 1463 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1464 | virtio_error(vdev, "Cannot map descriptor ring"); |
| 1465 | goto done; |
| 1466 | } |
| 1467 | |
Paolo Bonzini | 991976f | 2017-01-27 16:40:18 +0100 | [diff] [blame] | 1468 | desc_cache = &caches->desc; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1469 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1470 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
Dima Stepanov | 7423192 | 2019-01-15 13:08:47 +0300 | [diff] [blame] | 1471 | if (!desc.len || (desc.len % sizeof(VRingDesc))) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1472 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1473 | goto done; |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | /* loop over the indirect descriptor table */ |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 1477 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, |
| 1478 | desc.addr, desc.len, false); |
| 1479 | desc_cache = &indirect_desc_cache; |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1480 | if (len < desc.len) { |
| 1481 | virtio_error(vdev, "Cannot map indirect buffer"); |
| 1482 | goto done; |
| 1483 | } |
| 1484 | |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1485 | max = desc.len / sizeof(VRingDesc); |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1486 | i = 0; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1487 | vring_split_desc_read(vdev, &desc, desc_cache, i); |
Mark McLoughlin | efeea6d | 2009-06-17 11:38:28 +0100 | [diff] [blame] | 1488 | } |
| 1489 | |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1490 | /* Collect all the descriptors */ |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1491 | do { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1492 | bool map_ok; |
| 1493 | |
Paolo Bonzini | aa570d6 | 2016-01-31 11:29:03 +0100 | [diff] [blame] | 1494 | if (desc.flags & VRING_DESC_F_WRITE) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1495 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, |
| 1496 | iov + out_num, |
| 1497 | VIRTQUEUE_MAX_SIZE - out_num, true, |
| 1498 | desc.addr, desc.len); |
Kevin Wolf | 42fb2e0 | 2010-08-03 16:54:38 +0200 | [diff] [blame] | 1499 | } else { |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1500 | if (in_num) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1501 | virtio_error(vdev, "Incorrect order for descriptors"); |
| 1502 | goto err_undo_map; |
Michael S. Tsirkin | c8eac1c | 2011-06-20 13:42:27 +0300 | [diff] [blame] | 1503 | } |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1504 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, |
| 1505 | VIRTQUEUE_MAX_SIZE, false, |
| 1506 | desc.addr, desc.len); |
| 1507 | } |
| 1508 | if (!map_ok) { |
| 1509 | goto err_undo_map; |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 1510 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1511 | |
| 1512 | /* If we've got too many, that implies a descriptor loop. */ |
Wolfgang Bumiller | 37ef70b | 2017-09-20 08:09:33 +0200 | [diff] [blame] | 1513 | if (++elem_entries > max) { |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1514 | virtio_error(vdev, "Looped descriptor"); |
| 1515 | goto err_undo_map; |
aliguori | bb6834c | 2008-12-04 21:28:28 +0000 | [diff] [blame] | 1516 | } |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 1517 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1518 | rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, max, &i); |
Stefan Hajnoczi | 412e0e8 | 2016-09-21 16:52:24 +0100 | [diff] [blame] | 1519 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
| 1520 | |
| 1521 | if (rc == VIRTQUEUE_READ_DESC_ERROR) { |
| 1522 | goto err_undo_map; |
| 1523 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1524 | |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1525 | /* Now copy what we have collected and mapped */ |
| 1526 | elem = virtqueue_alloc_element(sz, out_num, in_num); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1527 | elem->index = head; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1528 | elem->ndescs = 1; |
Paolo Bonzini | 3b3b062 | 2016-01-31 11:29:01 +0100 | [diff] [blame] | 1529 | for (i = 0; i < out_num; i++) { |
| 1530 | elem->out_addr[i] = addr[i]; |
| 1531 | elem->out_sg[i] = iov[i]; |
| 1532 | } |
| 1533 | for (i = 0; i < in_num; i++) { |
| 1534 | elem->in_addr[i] = addr[out_num + i]; |
| 1535 | elem->in_sg[i] = iov[out_num + i]; |
| 1536 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1537 | |
| 1538 | vq->inuse++; |
| 1539 | |
Stefan Hajnoczi | 64979a4 | 2010-05-24 13:19:21 +0100 | [diff] [blame] | 1540 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1541 | done: |
Paolo Bonzini | 5eba040 | 2017-01-27 16:40:16 +0100 | [diff] [blame] | 1542 | address_space_cache_destroy(&indirect_desc_cache); |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1543 | |
Paolo Bonzini | 51b19eb | 2016-02-04 16:26:51 +0200 | [diff] [blame] | 1544 | return elem; |
Stefan Hajnoczi | ec55da1 | 2016-09-21 16:52:21 +0100 | [diff] [blame] | 1545 | |
| 1546 | err_undo_map: |
| 1547 | virtqueue_undo_map_desc(out_num, in_num, iov); |
Paolo Bonzini | 9796d0a | 2017-01-27 16:40:14 +0100 | [diff] [blame] | 1548 | goto done; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1549 | } |
| 1550 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1551 | static void *virtqueue_packed_pop(VirtQueue *vq, size_t sz) |
| 1552 | { |
| 1553 | unsigned int i, max; |
| 1554 | VRingMemoryRegionCaches *caches; |
| 1555 | MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; |
| 1556 | MemoryRegionCache *desc_cache; |
| 1557 | int64_t len; |
| 1558 | VirtIODevice *vdev = vq->vdev; |
| 1559 | VirtQueueElement *elem = NULL; |
| 1560 | unsigned out_num, in_num, elem_entries; |
| 1561 | hwaddr addr[VIRTQUEUE_MAX_SIZE]; |
| 1562 | struct iovec iov[VIRTQUEUE_MAX_SIZE]; |
| 1563 | VRingPackedDesc desc; |
| 1564 | uint16_t id; |
| 1565 | int rc; |
| 1566 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 1567 | RCU_READ_LOCK_GUARD(); |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1568 | if (virtio_queue_packed_empty_rcu(vq)) { |
| 1569 | goto done; |
| 1570 | } |
| 1571 | |
| 1572 | /* When we start there are none of either input nor output. */ |
| 1573 | out_num = in_num = elem_entries = 0; |
| 1574 | |
| 1575 | max = vq->vring.num; |
| 1576 | |
| 1577 | if (vq->inuse >= vq->vring.num) { |
| 1578 | virtio_error(vdev, "Virtqueue size exceeded"); |
| 1579 | goto done; |
| 1580 | } |
| 1581 | |
| 1582 | i = vq->last_avail_idx; |
| 1583 | |
| 1584 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 1585 | if (!caches) { |
| 1586 | virtio_error(vdev, "Region caches not initialized"); |
| 1587 | goto done; |
| 1588 | } |
| 1589 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1590 | if (caches->desc.len < max * sizeof(VRingDesc)) { |
| 1591 | virtio_error(vdev, "Cannot map descriptor ring"); |
| 1592 | goto done; |
| 1593 | } |
| 1594 | |
| 1595 | desc_cache = &caches->desc; |
| 1596 | vring_packed_desc_read(vdev, &desc, desc_cache, i, true); |
| 1597 | id = desc.id; |
| 1598 | if (desc.flags & VRING_DESC_F_INDIRECT) { |
| 1599 | if (desc.len % sizeof(VRingPackedDesc)) { |
| 1600 | virtio_error(vdev, "Invalid size for indirect buffer table"); |
| 1601 | goto done; |
| 1602 | } |
| 1603 | |
| 1604 | /* loop over the indirect descriptor table */ |
| 1605 | len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, |
| 1606 | desc.addr, desc.len, false); |
| 1607 | desc_cache = &indirect_desc_cache; |
| 1608 | if (len < desc.len) { |
| 1609 | virtio_error(vdev, "Cannot map indirect buffer"); |
| 1610 | goto done; |
| 1611 | } |
| 1612 | |
| 1613 | max = desc.len / sizeof(VRingPackedDesc); |
| 1614 | i = 0; |
| 1615 | vring_packed_desc_read(vdev, &desc, desc_cache, i, false); |
| 1616 | } |
| 1617 | |
| 1618 | /* Collect all the descriptors */ |
| 1619 | do { |
| 1620 | bool map_ok; |
| 1621 | |
| 1622 | if (desc.flags & VRING_DESC_F_WRITE) { |
| 1623 | map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num, |
| 1624 | iov + out_num, |
| 1625 | VIRTQUEUE_MAX_SIZE - out_num, true, |
| 1626 | desc.addr, desc.len); |
| 1627 | } else { |
| 1628 | if (in_num) { |
| 1629 | virtio_error(vdev, "Incorrect order for descriptors"); |
| 1630 | goto err_undo_map; |
| 1631 | } |
| 1632 | map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov, |
| 1633 | VIRTQUEUE_MAX_SIZE, false, |
| 1634 | desc.addr, desc.len); |
| 1635 | } |
| 1636 | if (!map_ok) { |
| 1637 | goto err_undo_map; |
| 1638 | } |
| 1639 | |
| 1640 | /* If we've got too many, that implies a descriptor loop. */ |
| 1641 | if (++elem_entries > max) { |
| 1642 | virtio_error(vdev, "Looped descriptor"); |
| 1643 | goto err_undo_map; |
| 1644 | } |
| 1645 | |
| 1646 | rc = virtqueue_packed_read_next_desc(vq, &desc, desc_cache, max, &i, |
| 1647 | desc_cache == |
| 1648 | &indirect_desc_cache); |
| 1649 | } while (rc == VIRTQUEUE_READ_DESC_MORE); |
| 1650 | |
| 1651 | /* Now copy what we have collected and mapped */ |
| 1652 | elem = virtqueue_alloc_element(sz, out_num, in_num); |
| 1653 | for (i = 0; i < out_num; i++) { |
| 1654 | elem->out_addr[i] = addr[i]; |
| 1655 | elem->out_sg[i] = iov[i]; |
| 1656 | } |
| 1657 | for (i = 0; i < in_num; i++) { |
| 1658 | elem->in_addr[i] = addr[out_num + i]; |
| 1659 | elem->in_sg[i] = iov[out_num + i]; |
| 1660 | } |
| 1661 | |
| 1662 | elem->index = id; |
| 1663 | elem->ndescs = (desc_cache == &indirect_desc_cache) ? 1 : elem_entries; |
| 1664 | vq->last_avail_idx += elem->ndescs; |
| 1665 | vq->inuse += elem->ndescs; |
| 1666 | |
| 1667 | if (vq->last_avail_idx >= vq->vring.num) { |
| 1668 | vq->last_avail_idx -= vq->vring.num; |
| 1669 | vq->last_avail_wrap_counter ^= 1; |
| 1670 | } |
| 1671 | |
| 1672 | vq->shadow_avail_idx = vq->last_avail_idx; |
| 1673 | vq->shadow_avail_wrap_counter = vq->last_avail_wrap_counter; |
| 1674 | |
| 1675 | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
| 1676 | done: |
| 1677 | address_space_cache_destroy(&indirect_desc_cache); |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1678 | |
| 1679 | return elem; |
| 1680 | |
| 1681 | err_undo_map: |
| 1682 | virtqueue_undo_map_desc(out_num, in_num, iov); |
| 1683 | goto done; |
| 1684 | } |
| 1685 | |
| 1686 | void *virtqueue_pop(VirtQueue *vq, size_t sz) |
| 1687 | { |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 1688 | if (virtio_device_disabled(vq->vdev)) { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1689 | return NULL; |
| 1690 | } |
| 1691 | |
| 1692 | if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { |
| 1693 | return virtqueue_packed_pop(vq, sz); |
| 1694 | } else { |
| 1695 | return virtqueue_split_pop(vq, sz); |
| 1696 | } |
| 1697 | } |
| 1698 | |
| 1699 | static unsigned int virtqueue_packed_drop_all(VirtQueue *vq) |
| 1700 | { |
| 1701 | VRingMemoryRegionCaches *caches; |
| 1702 | MemoryRegionCache *desc_cache; |
| 1703 | unsigned int dropped = 0; |
| 1704 | VirtQueueElement elem = {}; |
| 1705 | VirtIODevice *vdev = vq->vdev; |
| 1706 | VRingPackedDesc desc; |
| 1707 | |
| 1708 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 1709 | if (!caches) { |
| 1710 | return 0; |
| 1711 | } |
| 1712 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1713 | desc_cache = &caches->desc; |
| 1714 | |
| 1715 | virtio_queue_set_notification(vq, 0); |
| 1716 | |
| 1717 | while (vq->inuse < vq->vring.num) { |
| 1718 | unsigned int idx = vq->last_avail_idx; |
| 1719 | /* |
| 1720 | * works similar to virtqueue_pop but does not map buffers |
| 1721 | * and does not allocate any memory. |
| 1722 | */ |
| 1723 | vring_packed_desc_read(vdev, &desc, desc_cache, |
| 1724 | vq->last_avail_idx , true); |
| 1725 | if (!is_desc_avail(desc.flags, vq->last_avail_wrap_counter)) { |
| 1726 | break; |
| 1727 | } |
| 1728 | elem.index = desc.id; |
| 1729 | elem.ndescs = 1; |
| 1730 | while (virtqueue_packed_read_next_desc(vq, &desc, desc_cache, |
| 1731 | vq->vring.num, &idx, false)) { |
| 1732 | ++elem.ndescs; |
| 1733 | } |
| 1734 | /* |
| 1735 | * immediately push the element, nothing to unmap |
| 1736 | * as both in_num and out_num are set to 0. |
| 1737 | */ |
| 1738 | virtqueue_push(vq, &elem, 0); |
| 1739 | dropped++; |
| 1740 | vq->last_avail_idx += elem.ndescs; |
| 1741 | if (vq->last_avail_idx >= vq->vring.num) { |
| 1742 | vq->last_avail_idx -= vq->vring.num; |
| 1743 | vq->last_avail_wrap_counter ^= 1; |
| 1744 | } |
| 1745 | } |
| 1746 | |
| 1747 | return dropped; |
| 1748 | } |
| 1749 | |
| 1750 | static unsigned int virtqueue_split_drop_all(VirtQueue *vq) |
Yuri Benditovich | 54e1770 | 2016-12-13 10:12:07 +0200 | [diff] [blame] | 1751 | { |
| 1752 | unsigned int dropped = 0; |
| 1753 | VirtQueueElement elem = {}; |
| 1754 | VirtIODevice *vdev = vq->vdev; |
| 1755 | bool fEventIdx = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); |
| 1756 | |
Yuri Benditovich | 54e1770 | 2016-12-13 10:12:07 +0200 | [diff] [blame] | 1757 | while (!virtio_queue_empty(vq) && vq->inuse < vq->vring.num) { |
| 1758 | /* works similar to virtqueue_pop but does not map buffers |
| 1759 | * and does not allocate any memory */ |
| 1760 | smp_rmb(); |
| 1761 | if (!virtqueue_get_head(vq, vq->last_avail_idx, &elem.index)) { |
| 1762 | break; |
| 1763 | } |
| 1764 | vq->inuse++; |
| 1765 | vq->last_avail_idx++; |
| 1766 | if (fEventIdx) { |
| 1767 | vring_set_avail_event(vq, vq->last_avail_idx); |
| 1768 | } |
| 1769 | /* immediately push the element, nothing to unmap |
| 1770 | * as both in_num and out_num are set to 0 */ |
| 1771 | virtqueue_push(vq, &elem, 0); |
| 1772 | dropped++; |
| 1773 | } |
| 1774 | |
| 1775 | return dropped; |
| 1776 | } |
| 1777 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1778 | /* virtqueue_drop_all: |
| 1779 | * @vq: The #VirtQueue |
| 1780 | * Drops all queued buffers and indicates them to the guest |
| 1781 | * as if they are done. Useful when buffers can not be |
| 1782 | * processed but must be returned to the guest. |
| 1783 | */ |
| 1784 | unsigned int virtqueue_drop_all(VirtQueue *vq) |
| 1785 | { |
| 1786 | struct VirtIODevice *vdev = vq->vdev; |
| 1787 | |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 1788 | if (virtio_device_disabled(vq->vdev)) { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1789 | return 0; |
| 1790 | } |
| 1791 | |
| 1792 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 1793 | return virtqueue_packed_drop_all(vq); |
| 1794 | } else { |
| 1795 | return virtqueue_split_drop_all(vq); |
| 1796 | } |
| 1797 | } |
| 1798 | |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1799 | /* Reading and writing a structure directly to QEMUFile is *awful*, but |
| 1800 | * it is what QEMU has always done by mistake. We can change it sooner |
| 1801 | * or later by bumping the version number of the affected vm states. |
| 1802 | * In the meanwhile, since the in-memory layout of VirtQueueElement |
| 1803 | * has changed, we need to marshal to and from the layout that was |
| 1804 | * used before the change. |
| 1805 | */ |
| 1806 | typedef struct VirtQueueElementOld { |
| 1807 | unsigned int index; |
| 1808 | unsigned int out_num; |
| 1809 | unsigned int in_num; |
| 1810 | hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; |
| 1811 | hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; |
| 1812 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; |
| 1813 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; |
| 1814 | } VirtQueueElementOld; |
| 1815 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1816 | void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz) |
Paolo Bonzini | ab281c1 | 2016-01-31 11:28:59 +0100 | [diff] [blame] | 1817 | { |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1818 | VirtQueueElement *elem; |
| 1819 | VirtQueueElementOld data; |
| 1820 | int i; |
| 1821 | |
| 1822 | qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); |
| 1823 | |
Michael S. Tsirkin | 6bdc21c | 2017-01-18 21:32:22 +0200 | [diff] [blame] | 1824 | /* TODO: teach all callers that this can fail, and return failure instead |
| 1825 | * of asserting here. |
Eric Blake | 262a69f | 2017-09-11 16:13:20 -0500 | [diff] [blame] | 1826 | * This is just one thing (there are probably more) that must be |
| 1827 | * fixed before we can allow NDEBUG compilation. |
Michael S. Tsirkin | 6bdc21c | 2017-01-18 21:32:22 +0200 | [diff] [blame] | 1828 | */ |
Michael S. Tsirkin | 6bdc21c | 2017-01-18 21:32:22 +0200 | [diff] [blame] | 1829 | assert(ARRAY_SIZE(data.in_addr) >= data.in_num); |
| 1830 | assert(ARRAY_SIZE(data.out_addr) >= data.out_num); |
| 1831 | |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1832 | elem = virtqueue_alloc_element(sz, data.out_num, data.in_num); |
| 1833 | elem->index = data.index; |
| 1834 | |
| 1835 | for (i = 0; i < elem->in_num; i++) { |
| 1836 | elem->in_addr[i] = data.in_addr[i]; |
| 1837 | } |
| 1838 | |
| 1839 | for (i = 0; i < elem->out_num; i++) { |
| 1840 | elem->out_addr[i] = data.out_addr[i]; |
| 1841 | } |
| 1842 | |
| 1843 | for (i = 0; i < elem->in_num; i++) { |
| 1844 | /* Base is overwritten by virtqueue_map. */ |
| 1845 | elem->in_sg[i].iov_base = 0; |
| 1846 | elem->in_sg[i].iov_len = data.in_sg[i].iov_len; |
| 1847 | } |
| 1848 | |
| 1849 | for (i = 0; i < elem->out_num; i++) { |
| 1850 | /* Base is overwritten by virtqueue_map. */ |
| 1851 | elem->out_sg[i].iov_base = 0; |
| 1852 | elem->out_sg[i].iov_len = data.out_sg[i].iov_len; |
| 1853 | } |
| 1854 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1855 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 1856 | qemu_get_be32s(f, &elem->ndescs); |
| 1857 | } |
| 1858 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1859 | virtqueue_map(vdev, elem); |
Paolo Bonzini | ab281c1 | 2016-01-31 11:28:59 +0100 | [diff] [blame] | 1860 | return elem; |
| 1861 | } |
| 1862 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1863 | void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, |
| 1864 | VirtQueueElement *elem) |
Paolo Bonzini | ab281c1 | 2016-01-31 11:28:59 +0100 | [diff] [blame] | 1865 | { |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1866 | VirtQueueElementOld data; |
| 1867 | int i; |
| 1868 | |
| 1869 | memset(&data, 0, sizeof(data)); |
| 1870 | data.index = elem->index; |
| 1871 | data.in_num = elem->in_num; |
| 1872 | data.out_num = elem->out_num; |
| 1873 | |
| 1874 | for (i = 0; i < elem->in_num; i++) { |
| 1875 | data.in_addr[i] = elem->in_addr[i]; |
| 1876 | } |
| 1877 | |
| 1878 | for (i = 0; i < elem->out_num; i++) { |
| 1879 | data.out_addr[i] = elem->out_addr[i]; |
| 1880 | } |
| 1881 | |
| 1882 | for (i = 0; i < elem->in_num; i++) { |
| 1883 | /* Base is overwritten by virtqueue_map when loading. Do not |
| 1884 | * save it, as it would leak the QEMU address space layout. */ |
| 1885 | data.in_sg[i].iov_len = elem->in_sg[i].iov_len; |
| 1886 | } |
| 1887 | |
| 1888 | for (i = 0; i < elem->out_num; i++) { |
| 1889 | /* Do not save iov_base as above. */ |
| 1890 | data.out_sg[i].iov_len = elem->out_sg[i].iov_len; |
| 1891 | } |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 1892 | |
| 1893 | if (virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 1894 | qemu_put_be32s(f, &elem->ndescs); |
| 1895 | } |
| 1896 | |
Paolo Bonzini | 3724650 | 2016-01-31 11:29:00 +0100 | [diff] [blame] | 1897 | qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld)); |
Paolo Bonzini | ab281c1 | 2016-01-31 11:28:59 +0100 | [diff] [blame] | 1898 | } |
| 1899 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1900 | /* virtio device */ |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 1901 | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
| 1902 | { |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 1903 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 1904 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 1905 | |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 1906 | if (virtio_device_disabled(vdev)) { |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 1907 | return; |
| 1908 | } |
| 1909 | |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 1910 | if (k->notify) { |
| 1911 | k->notify(qbus->parent, vector); |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 1912 | } |
| 1913 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1914 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 1915 | void virtio_update_irq(VirtIODevice *vdev) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1916 | { |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 1917 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1918 | } |
| 1919 | |
Cornelia Huck | 0b352fd | 2015-06-04 12:34:15 +0200 | [diff] [blame] | 1920 | static int virtio_validate_features(VirtIODevice *vdev) |
| 1921 | { |
| 1922 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 1923 | |
Jason Wang | 8607f5c | 2016-12-30 18:09:10 +0800 | [diff] [blame] | 1924 | if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM) && |
| 1925 | !virtio_vdev_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { |
| 1926 | return -EFAULT; |
| 1927 | } |
| 1928 | |
Cornelia Huck | 0b352fd | 2015-06-04 12:34:15 +0200 | [diff] [blame] | 1929 | if (k->validate_features) { |
| 1930 | return k->validate_features(vdev); |
| 1931 | } else { |
| 1932 | return 0; |
| 1933 | } |
| 1934 | } |
| 1935 | |
| 1936 | int virtio_set_status(VirtIODevice *vdev, uint8_t val) |
Stefan Hajnoczi | 4e1837f | 2011-09-13 13:34:37 +0100 | [diff] [blame] | 1937 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 1938 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
Stefan Hajnoczi | 4e1837f | 2011-09-13 13:34:37 +0100 | [diff] [blame] | 1939 | trace_virtio_set_status(vdev, val); |
| 1940 | |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 1941 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
Cornelia Huck | 0b352fd | 2015-06-04 12:34:15 +0200 | [diff] [blame] | 1942 | if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && |
| 1943 | val & VIRTIO_CONFIG_S_FEATURES_OK) { |
| 1944 | int ret = virtio_validate_features(vdev); |
| 1945 | |
| 1946 | if (ret) { |
| 1947 | return ret; |
| 1948 | } |
| 1949 | } |
| 1950 | } |
Xie Yongji | e57f2c3 | 2019-06-26 10:31:26 +0800 | [diff] [blame] | 1951 | |
Xie Yongji | 4c5cf37 | 2019-06-26 10:31:30 +0800 | [diff] [blame] | 1952 | if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) != |
| 1953 | (val & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| 1954 | virtio_set_started(vdev, val & VIRTIO_CONFIG_S_DRIVER_OK); |
| 1955 | } |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 1956 | |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 1957 | if (k->set_status) { |
| 1958 | k->set_status(vdev, val); |
Stefan Hajnoczi | 4e1837f | 2011-09-13 13:34:37 +0100 | [diff] [blame] | 1959 | } |
| 1960 | vdev->status = val; |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 1961 | |
Cornelia Huck | 0b352fd | 2015-06-04 12:34:15 +0200 | [diff] [blame] | 1962 | return 0; |
Stefan Hajnoczi | 4e1837f | 2011-09-13 13:34:37 +0100 | [diff] [blame] | 1963 | } |
| 1964 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 1965 | static enum virtio_device_endian virtio_default_endian(void) |
| 1966 | { |
| 1967 | if (target_words_bigendian()) { |
| 1968 | return VIRTIO_DEVICE_ENDIAN_BIG; |
| 1969 | } else { |
| 1970 | return VIRTIO_DEVICE_ENDIAN_LITTLE; |
| 1971 | } |
| 1972 | } |
| 1973 | |
| 1974 | static enum virtio_device_endian virtio_current_cpu_endian(void) |
| 1975 | { |
| 1976 | CPUClass *cc = CPU_GET_CLASS(current_cpu); |
| 1977 | |
| 1978 | if (cc->virtio_is_big_endian(current_cpu)) { |
| 1979 | return VIRTIO_DEVICE_ENDIAN_BIG; |
| 1980 | } else { |
| 1981 | return VIRTIO_DEVICE_ENDIAN_LITTLE; |
| 1982 | } |
| 1983 | } |
| 1984 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 1985 | void virtio_reset(void *opaque) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1986 | { |
| 1987 | VirtIODevice *vdev = opaque; |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 1988 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 1989 | int i; |
| 1990 | |
Michael S. Tsirkin | e0c472d | 2010-09-27 18:32:52 +0200 | [diff] [blame] | 1991 | virtio_set_status(vdev, 0); |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 1992 | if (current_cpu) { |
| 1993 | /* Guest initiated reset */ |
| 1994 | vdev->device_endian = virtio_current_cpu_endian(); |
| 1995 | } else { |
| 1996 | /* System reset */ |
| 1997 | vdev->device_endian = virtio_default_endian(); |
| 1998 | } |
Michael S. Tsirkin | e0c472d | 2010-09-27 18:32:52 +0200 | [diff] [blame] | 1999 | |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2000 | if (k->reset) { |
| 2001 | k->reset(vdev); |
| 2002 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2003 | |
Xie Yongji | 868a8f4 | 2019-06-26 10:31:28 +0800 | [diff] [blame] | 2004 | vdev->start_on_kick = false; |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2005 | vdev->started = false; |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 2006 | vdev->broken = false; |
Michael S. Tsirkin | 704a76f | 2010-01-10 13:52:47 +0200 | [diff] [blame] | 2007 | vdev->guest_features = 0; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2008 | vdev->queue_sel = 0; |
| 2009 | vdev->status = 0; |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 2010 | vdev->disabled = false; |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 2011 | qatomic_set(&vdev->isr, 0); |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 2012 | vdev->config_vector = VIRTIO_NO_VECTOR; |
| 2013 | virtio_notify_vector(vdev, vdev->config_vector); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2014 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2015 | for(i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2016 | vdev->vq[i].vring.desc = 0; |
| 2017 | vdev->vq[i].vring.avail = 0; |
| 2018 | vdev->vq[i].vring.used = 0; |
| 2019 | vdev->vq[i].last_avail_idx = 0; |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 2020 | vdev->vq[i].shadow_avail_idx = 0; |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 2021 | vdev->vq[i].used_idx = 0; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 2022 | vdev->vq[i].last_avail_wrap_counter = true; |
| 2023 | vdev->vq[i].shadow_avail_wrap_counter = true; |
| 2024 | vdev->vq[i].used_wrap_counter = true; |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 2025 | virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2026 | vdev->vq[i].signalled_used = 0; |
| 2027 | vdev->vq[i].signalled_used_valid = false; |
Stefan Hajnoczi | 332fa82 | 2017-01-12 11:46:10 +0000 | [diff] [blame] | 2028 | vdev->vq[i].notification = true; |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2029 | vdev->vq[i].vring.num = vdev->vq[i].vring.num_default; |
Stefan Hajnoczi | 4b7f91e | 2016-09-07 11:51:25 -0400 | [diff] [blame] | 2030 | vdev->vq[i].inuse = 0; |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 2031 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2032 | } |
| 2033 | } |
| 2034 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2035 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2036 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2037 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2038 | uint8_t val; |
| 2039 | |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2040 | if (addr + sizeof(val) > vdev->config_len) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2041 | return (uint32_t)-1; |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2042 | } |
| 2043 | |
| 2044 | k->get_config(vdev, vdev->config); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2045 | |
Alexander Graf | 06dbfc6 | 2012-01-10 23:33:10 +0100 | [diff] [blame] | 2046 | val = ldub_p(vdev->config + addr); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2047 | return val; |
| 2048 | } |
| 2049 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2050 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2051 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2052 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2053 | uint16_t val; |
| 2054 | |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2055 | if (addr + sizeof(val) > vdev->config_len) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2056 | return (uint32_t)-1; |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2057 | } |
| 2058 | |
| 2059 | k->get_config(vdev, vdev->config); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2060 | |
Alexander Graf | 06dbfc6 | 2012-01-10 23:33:10 +0100 | [diff] [blame] | 2061 | val = lduw_p(vdev->config + addr); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2062 | return val; |
| 2063 | } |
| 2064 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2065 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2066 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2067 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2068 | uint32_t val; |
| 2069 | |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2070 | if (addr + sizeof(val) > vdev->config_len) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2071 | return (uint32_t)-1; |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2072 | } |
| 2073 | |
| 2074 | k->get_config(vdev, vdev->config); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2075 | |
Alexander Graf | 06dbfc6 | 2012-01-10 23:33:10 +0100 | [diff] [blame] | 2076 | val = ldl_p(vdev->config + addr); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2077 | return val; |
| 2078 | } |
| 2079 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2080 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2081 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2082 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2083 | uint8_t val = data; |
| 2084 | |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2085 | if (addr + sizeof(val) > vdev->config_len) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2086 | return; |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2087 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2088 | |
Alexander Graf | 06dbfc6 | 2012-01-10 23:33:10 +0100 | [diff] [blame] | 2089 | stb_p(vdev->config + addr, val); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2090 | |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2091 | if (k->set_config) { |
| 2092 | k->set_config(vdev, vdev->config); |
| 2093 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2094 | } |
| 2095 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2096 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2097 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2098 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2099 | uint16_t val = data; |
| 2100 | |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2101 | if (addr + sizeof(val) > vdev->config_len) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2102 | return; |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2103 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2104 | |
Alexander Graf | 06dbfc6 | 2012-01-10 23:33:10 +0100 | [diff] [blame] | 2105 | stw_p(vdev->config + addr, val); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2106 | |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2107 | if (k->set_config) { |
| 2108 | k->set_config(vdev, vdev->config); |
| 2109 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2110 | } |
| 2111 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2112 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2113 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2114 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2115 | uint32_t val = data; |
| 2116 | |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2117 | if (addr + sizeof(val) > vdev->config_len) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2118 | return; |
Jason Wang | 5f5a131 | 2013-05-07 13:42:49 +0800 | [diff] [blame] | 2119 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2120 | |
Alexander Graf | 06dbfc6 | 2012-01-10 23:33:10 +0100 | [diff] [blame] | 2121 | stl_p(vdev->config + addr, val); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2122 | |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2123 | if (k->set_config) { |
| 2124 | k->set_config(vdev, vdev->config); |
| 2125 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2126 | } |
| 2127 | |
Michael S. Tsirkin | adfb743 | 2015-06-04 12:34:24 +0200 | [diff] [blame] | 2128 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr) |
| 2129 | { |
| 2130 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 2131 | uint8_t val; |
| 2132 | |
| 2133 | if (addr + sizeof(val) > vdev->config_len) { |
| 2134 | return (uint32_t)-1; |
| 2135 | } |
| 2136 | |
| 2137 | k->get_config(vdev, vdev->config); |
| 2138 | |
| 2139 | val = ldub_p(vdev->config + addr); |
| 2140 | return val; |
| 2141 | } |
| 2142 | |
| 2143 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr) |
| 2144 | { |
| 2145 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 2146 | uint16_t val; |
| 2147 | |
| 2148 | if (addr + sizeof(val) > vdev->config_len) { |
| 2149 | return (uint32_t)-1; |
| 2150 | } |
| 2151 | |
| 2152 | k->get_config(vdev, vdev->config); |
| 2153 | |
| 2154 | val = lduw_le_p(vdev->config + addr); |
| 2155 | return val; |
| 2156 | } |
| 2157 | |
| 2158 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr) |
| 2159 | { |
| 2160 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 2161 | uint32_t val; |
| 2162 | |
| 2163 | if (addr + sizeof(val) > vdev->config_len) { |
| 2164 | return (uint32_t)-1; |
| 2165 | } |
| 2166 | |
| 2167 | k->get_config(vdev, vdev->config); |
| 2168 | |
| 2169 | val = ldl_le_p(vdev->config + addr); |
| 2170 | return val; |
| 2171 | } |
| 2172 | |
| 2173 | void virtio_config_modern_writeb(VirtIODevice *vdev, |
| 2174 | uint32_t addr, uint32_t data) |
| 2175 | { |
| 2176 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 2177 | uint8_t val = data; |
| 2178 | |
| 2179 | if (addr + sizeof(val) > vdev->config_len) { |
| 2180 | return; |
| 2181 | } |
| 2182 | |
| 2183 | stb_p(vdev->config + addr, val); |
| 2184 | |
| 2185 | if (k->set_config) { |
| 2186 | k->set_config(vdev, vdev->config); |
| 2187 | } |
| 2188 | } |
| 2189 | |
| 2190 | void virtio_config_modern_writew(VirtIODevice *vdev, |
| 2191 | uint32_t addr, uint32_t data) |
| 2192 | { |
| 2193 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 2194 | uint16_t val = data; |
| 2195 | |
| 2196 | if (addr + sizeof(val) > vdev->config_len) { |
| 2197 | return; |
| 2198 | } |
| 2199 | |
| 2200 | stw_le_p(vdev->config + addr, val); |
| 2201 | |
| 2202 | if (k->set_config) { |
| 2203 | k->set_config(vdev, vdev->config); |
| 2204 | } |
| 2205 | } |
| 2206 | |
| 2207 | void virtio_config_modern_writel(VirtIODevice *vdev, |
| 2208 | uint32_t addr, uint32_t data) |
| 2209 | { |
| 2210 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 2211 | uint32_t val = data; |
| 2212 | |
| 2213 | if (addr + sizeof(val) > vdev->config_len) { |
| 2214 | return; |
| 2215 | } |
| 2216 | |
| 2217 | stl_le_p(vdev->config + addr, val); |
| 2218 | |
| 2219 | if (k->set_config) { |
| 2220 | k->set_config(vdev, vdev->config); |
| 2221 | } |
| 2222 | } |
| 2223 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 2224 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2225 | { |
Prasad J Pandit | 758ead3 | 2017-11-29 23:14:27 +0530 | [diff] [blame] | 2226 | if (!vdev->vq[n].vring.num) { |
| 2227 | return; |
| 2228 | } |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 2229 | vdev->vq[n].vring.desc = addr; |
| 2230 | virtio_queue_update_rings(vdev, n); |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2231 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2232 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 2233 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2234 | { |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 2235 | return vdev->vq[n].vring.desc; |
| 2236 | } |
| 2237 | |
| 2238 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, |
| 2239 | hwaddr avail, hwaddr used) |
| 2240 | { |
Prasad J Pandit | 758ead3 | 2017-11-29 23:14:27 +0530 | [diff] [blame] | 2241 | if (!vdev->vq[n].vring.num) { |
| 2242 | return; |
| 2243 | } |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 2244 | vdev->vq[n].vring.desc = desc; |
| 2245 | vdev->vq[n].vring.avail = avail; |
| 2246 | vdev->vq[n].vring.used = used; |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 2247 | virtio_init_region_cache(vdev, n); |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2248 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2249 | |
Peter Maydell | e63c0ba | 2013-07-16 13:25:07 +0100 | [diff] [blame] | 2250 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) |
| 2251 | { |
Peter Maydell | f6049f4 | 2013-07-26 16:41:27 +0100 | [diff] [blame] | 2252 | /* Don't allow guest to flip queue between existent and |
| 2253 | * nonexistent states, or to set it to an invalid size. |
| 2254 | */ |
| 2255 | if (!!num != !!vdev->vq[n].vring.num || |
| 2256 | num > VIRTQUEUE_MAX_SIZE || |
| 2257 | num < 0) { |
| 2258 | return; |
Peter Maydell | e63c0ba | 2013-07-16 13:25:07 +0100 | [diff] [blame] | 2259 | } |
Peter Maydell | f6049f4 | 2013-07-26 16:41:27 +0100 | [diff] [blame] | 2260 | vdev->vq[n].vring.num = num; |
Peter Maydell | e63c0ba | 2013-07-16 13:25:07 +0100 | [diff] [blame] | 2261 | } |
| 2262 | |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 2263 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) |
| 2264 | { |
| 2265 | return QLIST_FIRST(&vdev->vector_queues[vector]); |
| 2266 | } |
| 2267 | |
| 2268 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq) |
| 2269 | { |
| 2270 | return QLIST_NEXT(vq, node); |
| 2271 | } |
| 2272 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2273 | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
| 2274 | { |
| 2275 | return vdev->vq[n].vring.num; |
| 2276 | } |
| 2277 | |
Michael S. Tsirkin | 8c797e7 | 2017-01-12 23:26:22 +0200 | [diff] [blame] | 2278 | int virtio_queue_get_max_num(VirtIODevice *vdev, int n) |
| 2279 | { |
| 2280 | return vdev->vq[n].vring.num_default; |
| 2281 | } |
| 2282 | |
Jason Wang | 8ad176a | 2015-05-29 14:15:26 +0800 | [diff] [blame] | 2283 | int virtio_get_num_queues(VirtIODevice *vdev) |
| 2284 | { |
| 2285 | int i; |
| 2286 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2287 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
Jason Wang | 8ad176a | 2015-05-29 14:15:26 +0800 | [diff] [blame] | 2288 | if (!virtio_queue_get_num(vdev, i)) { |
| 2289 | break; |
| 2290 | } |
| 2291 | } |
| 2292 | |
| 2293 | return i; |
| 2294 | } |
| 2295 | |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 2296 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) |
| 2297 | { |
| 2298 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 2299 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 2300 | |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 2301 | /* virtio-1 compliant devices cannot change the alignment */ |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 2302 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 2303 | error_report("tried to modify queue alignment for virtio-1 device"); |
| 2304 | return; |
| 2305 | } |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 2306 | /* Check that the transport told us it was going to do this |
| 2307 | * (so a buggy transport will immediately assert rather than |
| 2308 | * silently failing to migrate this state) |
| 2309 | */ |
| 2310 | assert(k->has_variable_vring_alignment); |
| 2311 | |
Prasad J Pandit | 758ead3 | 2017-11-29 23:14:27 +0530 | [diff] [blame] | 2312 | if (align) { |
| 2313 | vdev->vq[n].vring.align = align; |
| 2314 | virtio_queue_update_rings(vdev, n); |
| 2315 | } |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 2316 | } |
| 2317 | |
Fam Zheng | 0793169 | 2017-02-09 16:40:47 +0800 | [diff] [blame] | 2318 | static bool virtio_queue_notify_aio_vq(VirtQueue *vq) |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 2319 | { |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2320 | bool ret = false; |
| 2321 | |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 2322 | if (vq->vring.desc && vq->handle_aio_output) { |
| 2323 | VirtIODevice *vdev = vq->vdev; |
| 2324 | |
| 2325 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2326 | ret = vq->handle_aio_output(vdev, vq); |
| 2327 | |
| 2328 | if (unlikely(vdev->start_on_kick)) { |
Xie Yongji | e57f2c3 | 2019-06-26 10:31:26 +0800 | [diff] [blame] | 2329 | virtio_set_started(vdev, true); |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2330 | } |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 2331 | } |
Fam Zheng | 0793169 | 2017-02-09 16:40:47 +0800 | [diff] [blame] | 2332 | |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2333 | return ret; |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 2334 | } |
| 2335 | |
Paolo Bonzini | 2b2cbca | 2016-04-06 12:16:22 +0200 | [diff] [blame] | 2336 | static void virtio_queue_notify_vq(VirtQueue *vq) |
Stefan Hajnoczi | 25db9eb | 2010-12-17 12:01:50 +0000 | [diff] [blame] | 2337 | { |
Jason Wang | 9e0f5b8 | 2015-03-12 17:50:18 +0800 | [diff] [blame] | 2338 | if (vq->vring.desc && vq->handle_output) { |
Stefan Hajnoczi | 25db9eb | 2010-12-17 12:01:50 +0000 | [diff] [blame] | 2339 | VirtIODevice *vdev = vq->vdev; |
Jason Wang | 9e0f5b8 | 2015-03-12 17:50:18 +0800 | [diff] [blame] | 2340 | |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 2341 | if (unlikely(vdev->broken)) { |
| 2342 | return; |
| 2343 | } |
| 2344 | |
Stefan Hajnoczi | 25db9eb | 2010-12-17 12:01:50 +0000 | [diff] [blame] | 2345 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
| 2346 | vq->handle_output(vdev, vq); |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2347 | |
| 2348 | if (unlikely(vdev->start_on_kick)) { |
Xie Yongji | e57f2c3 | 2019-06-26 10:31:26 +0800 | [diff] [blame] | 2349 | virtio_set_started(vdev, true); |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2350 | } |
Stefan Hajnoczi | 25db9eb | 2010-12-17 12:01:50 +0000 | [diff] [blame] | 2351 | } |
| 2352 | } |
| 2353 | |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 2354 | void virtio_queue_notify(VirtIODevice *vdev, int n) |
| 2355 | { |
Paolo Bonzini | e49a661 | 2017-02-28 14:21:32 +0100 | [diff] [blame] | 2356 | VirtQueue *vq = &vdev->vq[n]; |
| 2357 | |
| 2358 | if (unlikely(!vq->vring.desc || vdev->broken)) { |
| 2359 | return; |
| 2360 | } |
| 2361 | |
| 2362 | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
Stefan Hajnoczi | fcccb27 | 2019-11-05 15:09:46 +0100 | [diff] [blame] | 2363 | if (vq->host_notifier_enabled) { |
Paolo Bonzini | e49a661 | 2017-02-28 14:21:32 +0100 | [diff] [blame] | 2364 | event_notifier_set(&vq->host_notifier); |
| 2365 | } else if (vq->handle_output) { |
| 2366 | vq->handle_output(vdev, vq); |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2367 | |
Xie Yongji | 8b04e2c | 2019-06-26 10:31:29 +0800 | [diff] [blame] | 2368 | if (unlikely(vdev->start_on_kick)) { |
| 2369 | virtio_set_started(vdev, true); |
| 2370 | } |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2371 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2372 | } |
| 2373 | |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 2374 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) |
| 2375 | { |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2376 | return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector : |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 2377 | VIRTIO_NO_VECTOR; |
| 2378 | } |
| 2379 | |
| 2380 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
| 2381 | { |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 2382 | VirtQueue *vq = &vdev->vq[n]; |
| 2383 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2384 | if (n < VIRTIO_QUEUE_MAX) { |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 2385 | if (vdev->vector_queues && |
| 2386 | vdev->vq[n].vector != VIRTIO_NO_VECTOR) { |
| 2387 | QLIST_REMOVE(vq, node); |
| 2388 | } |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 2389 | vdev->vq[n].vector = vector; |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 2390 | if (vdev->vector_queues && |
| 2391 | vector != VIRTIO_NO_VECTOR) { |
| 2392 | QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); |
| 2393 | } |
| 2394 | } |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 2395 | } |
| 2396 | |
Paolo Bonzini | f1ac6a5 | 2016-10-21 22:48:11 +0200 | [diff] [blame] | 2397 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
| 2398 | VirtIOHandleOutput handle_output) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2399 | { |
| 2400 | int i; |
| 2401 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2402 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2403 | if (vdev->vq[i].vring.num == 0) |
| 2404 | break; |
| 2405 | } |
| 2406 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2407 | if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2408 | abort(); |
| 2409 | |
| 2410 | vdev->vq[i].vring.num = queue_size; |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2411 | vdev->vq[i].vring.num_default = queue_size; |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 2412 | vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2413 | vdev->vq[i].handle_output = handle_output; |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 2414 | vdev->vq[i].handle_aio_output = NULL; |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 2415 | vdev->vq[i].used_elems = g_malloc0(sizeof(VirtQueueElement) * |
| 2416 | queue_size); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2417 | |
| 2418 | return &vdev->vq[i]; |
| 2419 | } |
| 2420 | |
Michael S. Tsirkin | 722f8c5 | 2019-12-09 11:46:13 -0500 | [diff] [blame] | 2421 | void virtio_delete_queue(VirtQueue *vq) |
| 2422 | { |
| 2423 | vq->vring.num = 0; |
| 2424 | vq->vring.num_default = 0; |
| 2425 | vq->handle_output = NULL; |
| 2426 | vq->handle_aio_output = NULL; |
| 2427 | g_free(vq->used_elems); |
Michael S. Tsirkin | 8cd353e | 2019-12-09 11:47:24 -0500 | [diff] [blame] | 2428 | vq->used_elems = NULL; |
Yuri Benditovich | 421afd2 | 2019-12-26 06:36:48 +0200 | [diff] [blame] | 2429 | virtio_virtqueue_reset_region_cache(vq); |
Michael S. Tsirkin | 722f8c5 | 2019-12-09 11:46:13 -0500 | [diff] [blame] | 2430 | } |
| 2431 | |
Jason Wang | f23fd81 | 2013-01-30 19:12:36 +0800 | [diff] [blame] | 2432 | void virtio_del_queue(VirtIODevice *vdev, int n) |
| 2433 | { |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2434 | if (n < 0 || n >= VIRTIO_QUEUE_MAX) { |
Jason Wang | f23fd81 | 2013-01-30 19:12:36 +0800 | [diff] [blame] | 2435 | abort(); |
| 2436 | } |
| 2437 | |
Michael S. Tsirkin | 722f8c5 | 2019-12-09 11:46:13 -0500 | [diff] [blame] | 2438 | virtio_delete_queue(&vdev->vq[n]); |
Jason Wang | f23fd81 | 2013-01-30 19:12:36 +0800 | [diff] [blame] | 2439 | } |
| 2440 | |
Paolo Bonzini | 0687c37 | 2016-11-18 16:07:01 +0100 | [diff] [blame] | 2441 | static void virtio_set_isr(VirtIODevice *vdev, int value) |
| 2442 | { |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 2443 | uint8_t old = qatomic_read(&vdev->isr); |
Paolo Bonzini | 0687c37 | 2016-11-18 16:07:01 +0100 | [diff] [blame] | 2444 | |
| 2445 | /* Do not write ISR if it does not change, so that its cacheline remains |
| 2446 | * shared in the common case where the guest does not read it. |
| 2447 | */ |
| 2448 | if ((old & value) != value) { |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 2449 | qatomic_or(&vdev->isr, value); |
Paolo Bonzini | 0687c37 | 2016-11-18 16:07:01 +0100 | [diff] [blame] | 2450 | } |
| 2451 | } |
| 2452 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 2453 | static bool virtio_split_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2454 | { |
| 2455 | uint16_t old, new; |
| 2456 | bool v; |
Michael S. Tsirkin | a281ebc | 2012-04-22 16:45:53 +0300 | [diff] [blame] | 2457 | /* We need to expose used array entries before checking used event. */ |
| 2458 | smp_mb(); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2459 | /* Always notify when queue is empty (when feature acknowledge) */ |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 2460 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) && |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 2461 | !vq->inuse && virtio_queue_empty(vq)) { |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2462 | return true; |
| 2463 | } |
| 2464 | |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 2465 | if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2466 | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); |
| 2467 | } |
| 2468 | |
| 2469 | v = vq->signalled_used_valid; |
| 2470 | vq->signalled_used_valid = true; |
| 2471 | old = vq->signalled_used; |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 2472 | new = vq->signalled_used = vq->used_idx; |
Michael S. Tsirkin | e9600c6 | 2015-02-16 22:35:46 +0100 | [diff] [blame] | 2473 | return !v || vring_need_event(vring_get_used_event(vq), new, old); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2474 | } |
| 2475 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 2476 | static bool vring_packed_need_event(VirtQueue *vq, bool wrap, |
| 2477 | uint16_t off_wrap, uint16_t new, |
| 2478 | uint16_t old) |
| 2479 | { |
| 2480 | int off = off_wrap & ~(1 << 15); |
| 2481 | |
| 2482 | if (wrap != off_wrap >> 15) { |
| 2483 | off -= vq->vring.num; |
| 2484 | } |
| 2485 | |
| 2486 | return vring_need_event(off, new, old); |
| 2487 | } |
| 2488 | |
| 2489 | static bool virtio_packed_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
| 2490 | { |
| 2491 | VRingPackedDescEvent e; |
| 2492 | uint16_t old, new; |
| 2493 | bool v; |
| 2494 | VRingMemoryRegionCaches *caches; |
| 2495 | |
| 2496 | caches = vring_get_region_caches(vq); |
Stefan Hajnoczi | abdd16f | 2020-02-07 10:46:19 +0000 | [diff] [blame] | 2497 | if (!caches) { |
| 2498 | return false; |
| 2499 | } |
| 2500 | |
Jason Wang | 683f766 | 2019-10-25 10:35:25 +0200 | [diff] [blame] | 2501 | vring_packed_event_read(vdev, &caches->avail, &e); |
| 2502 | |
| 2503 | old = vq->signalled_used; |
| 2504 | new = vq->signalled_used = vq->used_idx; |
| 2505 | v = vq->signalled_used_valid; |
| 2506 | vq->signalled_used_valid = true; |
| 2507 | |
| 2508 | if (e.flags == VRING_PACKED_EVENT_FLAG_DISABLE) { |
| 2509 | return false; |
| 2510 | } else if (e.flags == VRING_PACKED_EVENT_FLAG_ENABLE) { |
| 2511 | return true; |
| 2512 | } |
| 2513 | |
| 2514 | return !v || vring_packed_need_event(vq, vq->used_wrap_counter, |
| 2515 | e.off_wrap, new, old); |
| 2516 | } |
| 2517 | |
| 2518 | /* Called within rcu_read_lock(). */ |
| 2519 | static bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq) |
| 2520 | { |
| 2521 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 2522 | return virtio_packed_should_notify(vdev, vq); |
| 2523 | } else { |
| 2524 | return virtio_split_should_notify(vdev, vq); |
| 2525 | } |
| 2526 | } |
| 2527 | |
Paolo Bonzini | 83d768b | 2016-11-18 16:07:02 +0100 | [diff] [blame] | 2528 | void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq) |
| 2529 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 2530 | WITH_RCU_READ_LOCK_GUARD() { |
| 2531 | if (!virtio_should_notify(vdev, vq)) { |
| 2532 | return; |
| 2533 | } |
Paolo Bonzini | 83d768b | 2016-11-18 16:07:02 +0100 | [diff] [blame] | 2534 | } |
| 2535 | |
| 2536 | trace_virtio_notify_irqfd(vdev, vq); |
| 2537 | |
| 2538 | /* |
| 2539 | * virtio spec 1.0 says ISR bit 0 should be ignored with MSI, but |
| 2540 | * windows drivers included in virtio-win 1.8.0 (circa 2015) are |
| 2541 | * incorrectly polling this bit during crashdump and hibernation |
| 2542 | * in MSI mode, causing a hang if this bit is never updated. |
| 2543 | * Recent releases of Windows do not really shut down, but rather |
| 2544 | * log out and hibernate to make the next startup faster. Hence, |
| 2545 | * this manifested as a more serious hang during shutdown with |
| 2546 | * |
| 2547 | * Next driver release from 2016 fixed this problem, so working around it |
| 2548 | * is not a must, but it's easy to do so let's do it here. |
| 2549 | * |
| 2550 | * Note: it's safe to update ISR from any thread as it was switched |
| 2551 | * to an atomic operation. |
| 2552 | */ |
| 2553 | virtio_set_isr(vq->vdev, 0x1); |
| 2554 | event_notifier_set(&vq->guest_notifier); |
| 2555 | } |
| 2556 | |
Michael S. Tsirkin | b4b9862 | 2017-02-17 04:52:16 +0200 | [diff] [blame] | 2557 | static void virtio_irq(VirtQueue *vq) |
| 2558 | { |
| 2559 | virtio_set_isr(vq->vdev, 0x1); |
| 2560 | virtio_notify_vector(vq->vdev, vq->vector); |
| 2561 | } |
| 2562 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2563 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) |
| 2564 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 2565 | WITH_RCU_READ_LOCK_GUARD() { |
| 2566 | if (!virtio_should_notify(vdev, vq)) { |
| 2567 | return; |
| 2568 | } |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 2569 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2570 | |
Stefan Hajnoczi | 64979a4 | 2010-05-24 13:19:21 +0100 | [diff] [blame] | 2571 | trace_virtio_notify(vdev, vq); |
Michael S. Tsirkin | b4b9862 | 2017-02-17 04:52:16 +0200 | [diff] [blame] | 2572 | virtio_irq(vq); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2573 | } |
| 2574 | |
| 2575 | void virtio_notify_config(VirtIODevice *vdev) |
| 2576 | { |
aliguori | 7625162 | 2009-01-29 17:02:13 +0000 | [diff] [blame] | 2577 | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) |
| 2578 | return; |
| 2579 | |
Paolo Bonzini | 0687c37 | 2016-11-18 16:07:01 +0100 | [diff] [blame] | 2580 | virtio_set_isr(vdev, 0x3); |
Michael S. Tsirkin | b8f0590 | 2015-06-04 12:34:23 +0200 | [diff] [blame] | 2581 | vdev->generation++; |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 2582 | virtio_notify_vector(vdev, vdev->config_vector); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2583 | } |
| 2584 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 2585 | static bool virtio_device_endian_needed(void *opaque) |
| 2586 | { |
| 2587 | VirtIODevice *vdev = opaque; |
| 2588 | |
| 2589 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); |
Cornelia Huck | 95129d6 | 2015-08-17 11:48:29 +0200 | [diff] [blame] | 2590 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
Cornelia Huck | 3c18559 | 2015-06-04 12:34:11 +0200 | [diff] [blame] | 2591 | return vdev->device_endian != virtio_default_endian(); |
| 2592 | } |
| 2593 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ |
| 2594 | return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE; |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 2595 | } |
| 2596 | |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 2597 | static bool virtio_64bit_features_needed(void *opaque) |
| 2598 | { |
| 2599 | VirtIODevice *vdev = opaque; |
| 2600 | |
| 2601 | return (vdev->host_features >> 32) != 0; |
| 2602 | } |
| 2603 | |
Jason Wang | 74aae7b | 2015-08-05 17:50:07 +0800 | [diff] [blame] | 2604 | static bool virtio_virtqueue_needed(void *opaque) |
| 2605 | { |
| 2606 | VirtIODevice *vdev = opaque; |
| 2607 | |
| 2608 | return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1); |
| 2609 | } |
| 2610 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 2611 | static bool virtio_packed_virtqueue_needed(void *opaque) |
| 2612 | { |
| 2613 | VirtIODevice *vdev = opaque; |
| 2614 | |
| 2615 | return virtio_host_has_feature(vdev, VIRTIO_F_RING_PACKED); |
| 2616 | } |
| 2617 | |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2618 | static bool virtio_ringsize_needed(void *opaque) |
| 2619 | { |
| 2620 | VirtIODevice *vdev = opaque; |
| 2621 | int i; |
| 2622 | |
| 2623 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| 2624 | if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) { |
| 2625 | return true; |
| 2626 | } |
| 2627 | } |
| 2628 | return false; |
| 2629 | } |
| 2630 | |
Jason Wang | a6df8ad | 2015-11-06 16:02:44 +0800 | [diff] [blame] | 2631 | static bool virtio_extra_state_needed(void *opaque) |
| 2632 | { |
| 2633 | VirtIODevice *vdev = opaque; |
| 2634 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 2635 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 2636 | |
| 2637 | return k->has_extra_state && |
| 2638 | k->has_extra_state(qbus->parent); |
| 2639 | } |
| 2640 | |
Stefan Hajnoczi | 791b1da | 2016-09-21 16:52:20 +0100 | [diff] [blame] | 2641 | static bool virtio_broken_needed(void *opaque) |
| 2642 | { |
| 2643 | VirtIODevice *vdev = opaque; |
| 2644 | |
| 2645 | return vdev->broken; |
| 2646 | } |
| 2647 | |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2648 | static bool virtio_started_needed(void *opaque) |
| 2649 | { |
| 2650 | VirtIODevice *vdev = opaque; |
| 2651 | |
| 2652 | return vdev->started; |
| 2653 | } |
| 2654 | |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 2655 | static bool virtio_disabled_needed(void *opaque) |
| 2656 | { |
| 2657 | VirtIODevice *vdev = opaque; |
| 2658 | |
| 2659 | return vdev->disabled; |
| 2660 | } |
| 2661 | |
Dr. David Alan Gilbert | 50e5ae4 | 2016-01-06 12:23:39 +0000 | [diff] [blame] | 2662 | static const VMStateDescription vmstate_virtqueue = { |
Jason Wang | 74aae7b | 2015-08-05 17:50:07 +0800 | [diff] [blame] | 2663 | .name = "virtqueue_state", |
Dr. David Alan Gilbert | 50e5ae4 | 2016-01-06 12:23:39 +0000 | [diff] [blame] | 2664 | .version_id = 1, |
| 2665 | .minimum_version_id = 1, |
| 2666 | .fields = (VMStateField[]) { |
| 2667 | VMSTATE_UINT64(vring.avail, struct VirtQueue), |
| 2668 | VMSTATE_UINT64(vring.used, struct VirtQueue), |
| 2669 | VMSTATE_END_OF_LIST() |
| 2670 | } |
Jason Wang | 74aae7b | 2015-08-05 17:50:07 +0800 | [diff] [blame] | 2671 | }; |
| 2672 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 2673 | static const VMStateDescription vmstate_packed_virtqueue = { |
| 2674 | .name = "packed_virtqueue_state", |
| 2675 | .version_id = 1, |
| 2676 | .minimum_version_id = 1, |
| 2677 | .fields = (VMStateField[]) { |
| 2678 | VMSTATE_UINT16(last_avail_idx, struct VirtQueue), |
| 2679 | VMSTATE_BOOL(last_avail_wrap_counter, struct VirtQueue), |
| 2680 | VMSTATE_UINT16(used_idx, struct VirtQueue), |
| 2681 | VMSTATE_BOOL(used_wrap_counter, struct VirtQueue), |
| 2682 | VMSTATE_UINT32(inuse, struct VirtQueue), |
| 2683 | VMSTATE_END_OF_LIST() |
| 2684 | } |
| 2685 | }; |
| 2686 | |
Jason Wang | 74aae7b | 2015-08-05 17:50:07 +0800 | [diff] [blame] | 2687 | static const VMStateDescription vmstate_virtio_virtqueues = { |
| 2688 | .name = "virtio/virtqueues", |
| 2689 | .version_id = 1, |
| 2690 | .minimum_version_id = 1, |
| 2691 | .needed = &virtio_virtqueue_needed, |
| 2692 | .fields = (VMStateField[]) { |
Dr. David Alan Gilbert | 3e996cc | 2016-01-29 13:18:56 +0000 | [diff] [blame] | 2693 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
| 2694 | VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue), |
Jason Wang | 74aae7b | 2015-08-05 17:50:07 +0800 | [diff] [blame] | 2695 | VMSTATE_END_OF_LIST() |
| 2696 | } |
| 2697 | }; |
| 2698 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 2699 | static const VMStateDescription vmstate_virtio_packed_virtqueues = { |
| 2700 | .name = "virtio/packed_virtqueues", |
| 2701 | .version_id = 1, |
| 2702 | .minimum_version_id = 1, |
| 2703 | .needed = &virtio_packed_virtqueue_needed, |
| 2704 | .fields = (VMStateField[]) { |
| 2705 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
| 2706 | VIRTIO_QUEUE_MAX, 0, vmstate_packed_virtqueue, VirtQueue), |
| 2707 | VMSTATE_END_OF_LIST() |
| 2708 | } |
| 2709 | }; |
| 2710 | |
Dr. David Alan Gilbert | 50e5ae4 | 2016-01-06 12:23:39 +0000 | [diff] [blame] | 2711 | static const VMStateDescription vmstate_ringsize = { |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2712 | .name = "ringsize_state", |
Dr. David Alan Gilbert | 50e5ae4 | 2016-01-06 12:23:39 +0000 | [diff] [blame] | 2713 | .version_id = 1, |
| 2714 | .minimum_version_id = 1, |
| 2715 | .fields = (VMStateField[]) { |
| 2716 | VMSTATE_UINT32(vring.num_default, struct VirtQueue), |
| 2717 | VMSTATE_END_OF_LIST() |
| 2718 | } |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2719 | }; |
| 2720 | |
| 2721 | static const VMStateDescription vmstate_virtio_ringsize = { |
| 2722 | .name = "virtio/ringsize", |
| 2723 | .version_id = 1, |
| 2724 | .minimum_version_id = 1, |
| 2725 | .needed = &virtio_ringsize_needed, |
| 2726 | .fields = (VMStateField[]) { |
Dr. David Alan Gilbert | 3e996cc | 2016-01-29 13:18:56 +0000 | [diff] [blame] | 2727 | VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice, |
| 2728 | VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue), |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2729 | VMSTATE_END_OF_LIST() |
| 2730 | } |
| 2731 | }; |
| 2732 | |
Jianjun Duan | 2c21ee7 | 2017-01-19 11:00:50 -0800 | [diff] [blame] | 2733 | static int get_extra_state(QEMUFile *f, void *pv, size_t size, |
Marc-André Lureau | 03fee66 | 2018-11-14 17:29:30 +0400 | [diff] [blame] | 2734 | const VMStateField *field) |
Jason Wang | a6df8ad | 2015-11-06 16:02:44 +0800 | [diff] [blame] | 2735 | { |
| 2736 | VirtIODevice *vdev = pv; |
| 2737 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 2738 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 2739 | |
| 2740 | if (!k->load_extra_state) { |
| 2741 | return -1; |
| 2742 | } else { |
| 2743 | return k->load_extra_state(qbus->parent, f); |
| 2744 | } |
| 2745 | } |
| 2746 | |
Jianjun Duan | 2c21ee7 | 2017-01-19 11:00:50 -0800 | [diff] [blame] | 2747 | static int put_extra_state(QEMUFile *f, void *pv, size_t size, |
Markus Armbruster | 3ddba9a | 2020-12-11 18:11:48 +0100 | [diff] [blame] | 2748 | const VMStateField *field, JSONWriter *vmdesc) |
Jason Wang | a6df8ad | 2015-11-06 16:02:44 +0800 | [diff] [blame] | 2749 | { |
| 2750 | VirtIODevice *vdev = pv; |
| 2751 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 2752 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 2753 | |
| 2754 | k->save_extra_state(qbus->parent, f); |
Jianjun Duan | 2c21ee7 | 2017-01-19 11:00:50 -0800 | [diff] [blame] | 2755 | return 0; |
Jason Wang | a6df8ad | 2015-11-06 16:02:44 +0800 | [diff] [blame] | 2756 | } |
| 2757 | |
| 2758 | static const VMStateInfo vmstate_info_extra_state = { |
| 2759 | .name = "virtqueue_extra_state", |
| 2760 | .get = get_extra_state, |
| 2761 | .put = put_extra_state, |
| 2762 | }; |
| 2763 | |
| 2764 | static const VMStateDescription vmstate_virtio_extra_state = { |
| 2765 | .name = "virtio/extra_state", |
| 2766 | .version_id = 1, |
| 2767 | .minimum_version_id = 1, |
| 2768 | .needed = &virtio_extra_state_needed, |
| 2769 | .fields = (VMStateField[]) { |
| 2770 | { |
| 2771 | .name = "extra_state", |
| 2772 | .version_id = 0, |
| 2773 | .field_exists = NULL, |
| 2774 | .size = 0, |
| 2775 | .info = &vmstate_info_extra_state, |
| 2776 | .flags = VMS_SINGLE, |
| 2777 | .offset = 0, |
| 2778 | }, |
| 2779 | VMSTATE_END_OF_LIST() |
| 2780 | } |
| 2781 | }; |
| 2782 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 2783 | static const VMStateDescription vmstate_virtio_device_endian = { |
| 2784 | .name = "virtio/device_endian", |
| 2785 | .version_id = 1, |
| 2786 | .minimum_version_id = 1, |
Juan Quintela | 5cd8cad | 2014-09-23 14:09:54 +0200 | [diff] [blame] | 2787 | .needed = &virtio_device_endian_needed, |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 2788 | .fields = (VMStateField[]) { |
| 2789 | VMSTATE_UINT8(device_endian, VirtIODevice), |
| 2790 | VMSTATE_END_OF_LIST() |
| 2791 | } |
| 2792 | }; |
| 2793 | |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 2794 | static const VMStateDescription vmstate_virtio_64bit_features = { |
| 2795 | .name = "virtio/64bit_features", |
| 2796 | .version_id = 1, |
| 2797 | .minimum_version_id = 1, |
Juan Quintela | 5cd8cad | 2014-09-23 14:09:54 +0200 | [diff] [blame] | 2798 | .needed = &virtio_64bit_features_needed, |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 2799 | .fields = (VMStateField[]) { |
| 2800 | VMSTATE_UINT64(guest_features, VirtIODevice), |
| 2801 | VMSTATE_END_OF_LIST() |
| 2802 | } |
| 2803 | }; |
| 2804 | |
Stefan Hajnoczi | 791b1da | 2016-09-21 16:52:20 +0100 | [diff] [blame] | 2805 | static const VMStateDescription vmstate_virtio_broken = { |
| 2806 | .name = "virtio/broken", |
| 2807 | .version_id = 1, |
| 2808 | .minimum_version_id = 1, |
| 2809 | .needed = &virtio_broken_needed, |
| 2810 | .fields = (VMStateField[]) { |
| 2811 | VMSTATE_BOOL(broken, VirtIODevice), |
| 2812 | VMSTATE_END_OF_LIST() |
| 2813 | } |
| 2814 | }; |
| 2815 | |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2816 | static const VMStateDescription vmstate_virtio_started = { |
| 2817 | .name = "virtio/started", |
| 2818 | .version_id = 1, |
| 2819 | .minimum_version_id = 1, |
| 2820 | .needed = &virtio_started_needed, |
| 2821 | .fields = (VMStateField[]) { |
| 2822 | VMSTATE_BOOL(started, VirtIODevice), |
| 2823 | VMSTATE_END_OF_LIST() |
| 2824 | } |
| 2825 | }; |
| 2826 | |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 2827 | static const VMStateDescription vmstate_virtio_disabled = { |
| 2828 | .name = "virtio/disabled", |
| 2829 | .version_id = 1, |
| 2830 | .minimum_version_id = 1, |
| 2831 | .needed = &virtio_disabled_needed, |
| 2832 | .fields = (VMStateField[]) { |
| 2833 | VMSTATE_BOOL(disabled, VirtIODevice), |
| 2834 | VMSTATE_END_OF_LIST() |
| 2835 | } |
| 2836 | }; |
| 2837 | |
Greg Kurz | 6b321a3 | 2014-06-24 19:22:30 +0200 | [diff] [blame] | 2838 | static const VMStateDescription vmstate_virtio = { |
| 2839 | .name = "virtio", |
| 2840 | .version_id = 1, |
| 2841 | .minimum_version_id = 1, |
| 2842 | .minimum_version_id_old = 1, |
| 2843 | .fields = (VMStateField[]) { |
| 2844 | VMSTATE_END_OF_LIST() |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 2845 | }, |
Juan Quintela | 5cd8cad | 2014-09-23 14:09:54 +0200 | [diff] [blame] | 2846 | .subsections = (const VMStateDescription*[]) { |
| 2847 | &vmstate_virtio_device_endian, |
| 2848 | &vmstate_virtio_64bit_features, |
Jason Wang | 74aae7b | 2015-08-05 17:50:07 +0800 | [diff] [blame] | 2849 | &vmstate_virtio_virtqueues, |
Cornelia Huck | 46c5d08 | 2015-09-11 15:16:41 +0200 | [diff] [blame] | 2850 | &vmstate_virtio_ringsize, |
Stefan Hajnoczi | 791b1da | 2016-09-21 16:52:20 +0100 | [diff] [blame] | 2851 | &vmstate_virtio_broken, |
Jason Wang | a6df8ad | 2015-11-06 16:02:44 +0800 | [diff] [blame] | 2852 | &vmstate_virtio_extra_state, |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 2853 | &vmstate_virtio_started, |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 2854 | &vmstate_virtio_packed_virtqueues, |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 2855 | &vmstate_virtio_disabled, |
Juan Quintela | 5cd8cad | 2014-09-23 14:09:54 +0200 | [diff] [blame] | 2856 | NULL |
Greg Kurz | 6b321a3 | 2014-06-24 19:22:30 +0200 | [diff] [blame] | 2857 | } |
| 2858 | }; |
| 2859 | |
Dr. David Alan Gilbert | 2f168d0 | 2017-09-25 12:29:17 +0100 | [diff] [blame] | 2860 | int virtio_save(VirtIODevice *vdev, QEMUFile *f) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2861 | { |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 2862 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 2863 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
Greg Kurz | 1b5fc0d | 2014-06-24 19:15:31 +0200 | [diff] [blame] | 2864 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 2865 | uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2866 | int i; |
| 2867 | |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 2868 | if (k->save_config) { |
| 2869 | k->save_config(qbus->parent, f); |
| 2870 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2871 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2872 | qemu_put_8s(f, &vdev->status); |
| 2873 | qemu_put_8s(f, &vdev->isr); |
| 2874 | qemu_put_be16s(f, &vdev->queue_sel); |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 2875 | qemu_put_be32s(f, &guest_features_lo); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2876 | qemu_put_be32(f, vdev->config_len); |
| 2877 | qemu_put_buffer(f, vdev->config, vdev->config_len); |
| 2878 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2879 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2880 | if (vdev->vq[i].vring.num == 0) |
| 2881 | break; |
| 2882 | } |
| 2883 | |
| 2884 | qemu_put_be32(f, i); |
| 2885 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 2886 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2887 | if (vdev->vq[i].vring.num == 0) |
| 2888 | break; |
| 2889 | |
| 2890 | qemu_put_be32(f, vdev->vq[i].vring.num); |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 2891 | if (k->has_variable_vring_alignment) { |
| 2892 | qemu_put_be32(f, vdev->vq[i].vring.align); |
| 2893 | } |
Stefan Hajnoczi | 874adf4 | 2017-02-22 16:37:34 +0000 | [diff] [blame] | 2894 | /* |
| 2895 | * Save desc now, the rest of the ring addresses are saved in |
| 2896 | * subsections for VIRTIO-1 devices. |
| 2897 | */ |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 2898 | qemu_put_be64(f, vdev->vq[i].vring.desc); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2899 | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 2900 | if (k->save_queue) { |
| 2901 | k->save_queue(qbus->parent, i, f); |
| 2902 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2903 | } |
Greg Kurz | 1b5fc0d | 2014-06-24 19:15:31 +0200 | [diff] [blame] | 2904 | |
| 2905 | if (vdc->save != NULL) { |
| 2906 | vdc->save(vdev, f); |
| 2907 | } |
Greg Kurz | 6b321a3 | 2014-06-24 19:22:30 +0200 | [diff] [blame] | 2908 | |
Dr. David Alan Gilbert | ea43e25 | 2016-10-27 18:36:36 +0100 | [diff] [blame] | 2909 | if (vdc->vmsd) { |
Dr. David Alan Gilbert | 2f168d0 | 2017-09-25 12:29:17 +0100 | [diff] [blame] | 2910 | int ret = vmstate_save_state(f, vdc->vmsd, vdev, NULL); |
| 2911 | if (ret) { |
| 2912 | return ret; |
| 2913 | } |
Dr. David Alan Gilbert | ea43e25 | 2016-10-27 18:36:36 +0100 | [diff] [blame] | 2914 | } |
| 2915 | |
Greg Kurz | 6b321a3 | 2014-06-24 19:22:30 +0200 | [diff] [blame] | 2916 | /* Subsections */ |
Dr. David Alan Gilbert | 2f168d0 | 2017-09-25 12:29:17 +0100 | [diff] [blame] | 2917 | return vmstate_save_state(f, &vmstate_virtio, vdev, NULL); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 2918 | } |
| 2919 | |
Dr. David Alan Gilbert | 5943124 | 2016-07-14 18:22:45 +0100 | [diff] [blame] | 2920 | /* A wrapper for use as a VMState .put function */ |
Jianjun Duan | 2c21ee7 | 2017-01-19 11:00:50 -0800 | [diff] [blame] | 2921 | static int virtio_device_put(QEMUFile *f, void *opaque, size_t size, |
Markus Armbruster | 3ddba9a | 2020-12-11 18:11:48 +0100 | [diff] [blame] | 2922 | const VMStateField *field, JSONWriter *vmdesc) |
Halil Pasic | 1a66585 | 2016-10-06 14:55:39 +0200 | [diff] [blame] | 2923 | { |
Dr. David Alan Gilbert | 2f168d0 | 2017-09-25 12:29:17 +0100 | [diff] [blame] | 2924 | return virtio_save(VIRTIO_DEVICE(opaque), f); |
Halil Pasic | 1a66585 | 2016-10-06 14:55:39 +0200 | [diff] [blame] | 2925 | } |
| 2926 | |
| 2927 | /* A wrapper for use as a VMState .get function */ |
Jianjun Duan | 2c21ee7 | 2017-01-19 11:00:50 -0800 | [diff] [blame] | 2928 | static int virtio_device_get(QEMUFile *f, void *opaque, size_t size, |
Marc-André Lureau | 03fee66 | 2018-11-14 17:29:30 +0400 | [diff] [blame] | 2929 | const VMStateField *field) |
Halil Pasic | 1a66585 | 2016-10-06 14:55:39 +0200 | [diff] [blame] | 2930 | { |
| 2931 | VirtIODevice *vdev = VIRTIO_DEVICE(opaque); |
| 2932 | DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev)); |
| 2933 | |
| 2934 | return virtio_load(vdev, f, dc->vmsd->version_id); |
| 2935 | } |
| 2936 | |
| 2937 | const VMStateInfo virtio_vmstate_info = { |
| 2938 | .name = "virtio", |
| 2939 | .get = virtio_device_get, |
| 2940 | .put = virtio_device_put, |
| 2941 | }; |
| 2942 | |
Cornelia Huck | 6c0196d | 2015-06-04 12:34:14 +0200 | [diff] [blame] | 2943 | static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) |
Paolo Bonzini | ad0c933 | 2011-11-24 13:28:52 +0100 | [diff] [blame] | 2944 | { |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2945 | VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
Cornelia Huck | 6b8f102 | 2015-05-26 16:34:47 +0200 | [diff] [blame] | 2946 | bool bad = (val & ~(vdev->host_features)) != 0; |
Paolo Bonzini | ad0c933 | 2011-11-24 13:28:52 +0100 | [diff] [blame] | 2947 | |
Cornelia Huck | 6b8f102 | 2015-05-26 16:34:47 +0200 | [diff] [blame] | 2948 | val &= vdev->host_features; |
KONRAD Frederic | 181103c | 2013-04-24 10:21:20 +0200 | [diff] [blame] | 2949 | if (k->set_features) { |
| 2950 | k->set_features(vdev, val); |
Paolo Bonzini | ad0c933 | 2011-11-24 13:28:52 +0100 | [diff] [blame] | 2951 | } |
| 2952 | vdev->guest_features = val; |
| 2953 | return bad ? -1 : 0; |
| 2954 | } |
| 2955 | |
Cornelia Huck | 6c0196d | 2015-06-04 12:34:14 +0200 | [diff] [blame] | 2956 | int virtio_set_features(VirtIODevice *vdev, uint64_t val) |
| 2957 | { |
Paolo Bonzini | db812c4 | 2018-08-23 14:21:23 +0200 | [diff] [blame] | 2958 | int ret; |
| 2959 | /* |
Cornelia Huck | 6c0196d | 2015-06-04 12:34:14 +0200 | [diff] [blame] | 2960 | * The driver must not attempt to set features after feature negotiation |
| 2961 | * has finished. |
| 2962 | */ |
| 2963 | if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { |
| 2964 | return -EINVAL; |
| 2965 | } |
Paolo Bonzini | db812c4 | 2018-08-23 14:21:23 +0200 | [diff] [blame] | 2966 | ret = virtio_set_features_nocheck(vdev, val); |
Li Qiang | 2d69eba | 2020-09-19 01:27:06 -0700 | [diff] [blame] | 2967 | if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { |
| 2968 | /* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */ |
| 2969 | int i; |
| 2970 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| 2971 | if (vdev->vq[i].vring.num != 0) { |
| 2972 | virtio_init_region_cache(vdev, i); |
Paolo Bonzini | db812c4 | 2018-08-23 14:21:23 +0200 | [diff] [blame] | 2973 | } |
| 2974 | } |
Li Qiang | 2d69eba | 2020-09-19 01:27:06 -0700 | [diff] [blame] | 2975 | } |
| 2976 | if (!ret) { |
Xie Yongji | 868a8f4 | 2019-06-26 10:31:28 +0800 | [diff] [blame] | 2977 | if (!virtio_device_started(vdev, vdev->status) && |
| 2978 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
| 2979 | vdev->start_on_kick = true; |
| 2980 | } |
Paolo Bonzini | db812c4 | 2018-08-23 14:21:23 +0200 | [diff] [blame] | 2981 | } |
| 2982 | return ret; |
Cornelia Huck | 6c0196d | 2015-06-04 12:34:14 +0200 | [diff] [blame] | 2983 | } |
| 2984 | |
Stefano Garzarella | ba55085 | 2019-02-21 11:33:08 +0100 | [diff] [blame] | 2985 | size_t virtio_feature_get_config_size(VirtIOFeature *feature_sizes, |
| 2986 | uint64_t host_features) |
| 2987 | { |
| 2988 | size_t config_size = 0; |
| 2989 | int i; |
| 2990 | |
| 2991 | for (i = 0; feature_sizes[i].flags != 0; i++) { |
| 2992 | if (host_features & feature_sizes[i].flags) { |
| 2993 | config_size = MAX(feature_sizes[i].end, config_size); |
| 2994 | } |
| 2995 | } |
| 2996 | |
| 2997 | return config_size; |
| 2998 | } |
| 2999 | |
Greg Kurz | 1b5fc0d | 2014-06-24 19:15:31 +0200 | [diff] [blame] | 3000 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3001 | { |
Michael S. Tsirkin | cc45995 | 2014-04-03 19:51:14 +0300 | [diff] [blame] | 3002 | int i, ret; |
Michael S. Tsirkin | a890a2f | 2014-04-28 16:08:23 +0300 | [diff] [blame] | 3003 | int32_t config_len; |
Michael S. Tsirkin | cc45995 | 2014-04-03 19:51:14 +0300 | [diff] [blame] | 3004 | uint32_t num; |
Michael S. Tsirkin | 6d74ca5 | 2009-12-08 20:07:48 +0200 | [diff] [blame] | 3005 | uint32_t features; |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 3006 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3007 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
Greg Kurz | 1b5fc0d | 2014-06-24 19:15:31 +0200 | [diff] [blame] | 3008 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3009 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3010 | /* |
| 3011 | * We poison the endianness to ensure it does not get used before |
| 3012 | * subsections have been loaded. |
| 3013 | */ |
| 3014 | vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN; |
| 3015 | |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 3016 | if (k->load_config) { |
| 3017 | ret = k->load_config(qbus->parent, f); |
Michael S. Tsirkin | ff24bd5 | 2009-06-21 19:50:40 +0300 | [diff] [blame] | 3018 | if (ret) |
| 3019 | return ret; |
| 3020 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3021 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3022 | qemu_get_8s(f, &vdev->status); |
| 3023 | qemu_get_8s(f, &vdev->isr); |
| 3024 | qemu_get_be16s(f, &vdev->queue_sel); |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 3025 | if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) { |
Michael Roth | 4b53c2c | 2014-04-03 19:51:46 +0300 | [diff] [blame] | 3026 | return -1; |
| 3027 | } |
Michael S. Tsirkin | 6d74ca5 | 2009-12-08 20:07:48 +0200 | [diff] [blame] | 3028 | qemu_get_be32s(f, &features); |
Paolo Bonzini | ad0c933 | 2011-11-24 13:28:52 +0100 | [diff] [blame] | 3029 | |
Michael S. Tsirkin | 62cee1a | 2016-07-04 14:39:10 +0300 | [diff] [blame] | 3030 | /* |
| 3031 | * Temporarily set guest_features low bits - needed by |
| 3032 | * virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS |
| 3033 | * VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ. |
| 3034 | * |
| 3035 | * Note: devices should always test host features in future - don't create |
| 3036 | * new dependencies like this. |
| 3037 | */ |
| 3038 | vdev->guest_features = features; |
| 3039 | |
Michael S. Tsirkin | a890a2f | 2014-04-28 16:08:23 +0300 | [diff] [blame] | 3040 | config_len = qemu_get_be32(f); |
Dr. David Alan Gilbert | 2f5732e | 2014-06-27 20:02:48 +0100 | [diff] [blame] | 3041 | |
| 3042 | /* |
| 3043 | * There are cases where the incoming config can be bigger or smaller |
| 3044 | * than what we have; so load what we have space for, and skip |
| 3045 | * any excess that's in the stream. |
| 3046 | */ |
| 3047 | qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len)); |
| 3048 | |
| 3049 | while (config_len > vdev->config_len) { |
| 3050 | qemu_get_byte(f); |
| 3051 | config_len--; |
Michael S. Tsirkin | a890a2f | 2014-04-28 16:08:23 +0300 | [diff] [blame] | 3052 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3053 | |
| 3054 | num = qemu_get_be32(f); |
| 3055 | |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 3056 | if (num > VIRTIO_QUEUE_MAX) { |
Cornelia Huck | 8a1be66 | 2016-01-08 11:00:00 +0100 | [diff] [blame] | 3057 | error_report("Invalid number of virtqueues: 0x%x", num); |
Michael S. Tsirkin | cc45995 | 2014-04-03 19:51:14 +0300 | [diff] [blame] | 3058 | return -1; |
| 3059 | } |
| 3060 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3061 | for (i = 0; i < num; i++) { |
| 3062 | vdev->vq[i].vring.num = qemu_get_be32(f); |
Peter Maydell | 6ce69d1 | 2013-07-16 13:25:08 +0100 | [diff] [blame] | 3063 | if (k->has_variable_vring_alignment) { |
| 3064 | vdev->vq[i].vring.align = qemu_get_be32(f); |
| 3065 | } |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 3066 | vdev->vq[i].vring.desc = qemu_get_be64(f); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3067 | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
Michael S. Tsirkin | bcbabae | 2011-06-12 16:21:57 +0300 | [diff] [blame] | 3068 | vdev->vq[i].signalled_used_valid = false; |
Stefan Hajnoczi | 332fa82 | 2017-01-12 11:46:10 +0000 | [diff] [blame] | 3069 | vdev->vq[i].notification = true; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3070 | |
Stefan Hajnoczi | 874adf4 | 2017-02-22 16:37:34 +0000 | [diff] [blame] | 3071 | if (!vdev->vq[i].vring.desc && vdev->vq[i].last_avail_idx) { |
Michael S. Tsirkin | 1abeb5a | 2010-11-23 21:55:39 +0200 | [diff] [blame] | 3072 | error_report("VQ %d address 0x0 " |
Markus Armbruster | 6daf194 | 2011-06-22 14:03:54 +0200 | [diff] [blame] | 3073 | "inconsistent with Host index 0x%x", |
Michael S. Tsirkin | 1abeb5a | 2010-11-23 21:55:39 +0200 | [diff] [blame] | 3074 | i, vdev->vq[i].last_avail_idx); |
Stefan Hajnoczi | 874adf4 | 2017-02-22 16:37:34 +0000 | [diff] [blame] | 3075 | return -1; |
Stefan Hajnoczi | 8275e2f | 2016-09-21 16:52:18 +0100 | [diff] [blame] | 3076 | } |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 3077 | if (k->load_queue) { |
| 3078 | ret = k->load_queue(qbus->parent, i, f); |
Michael S. Tsirkin | ff24bd5 | 2009-06-21 19:50:40 +0300 | [diff] [blame] | 3079 | if (ret) |
| 3080 | return ret; |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 3081 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3082 | } |
| 3083 | |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 3084 | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
Greg Kurz | 1b5fc0d | 2014-06-24 19:15:31 +0200 | [diff] [blame] | 3085 | |
| 3086 | if (vdc->load != NULL) { |
Greg Kurz | 6b321a3 | 2014-06-24 19:22:30 +0200 | [diff] [blame] | 3087 | ret = vdc->load(vdev, f, version_id); |
| 3088 | if (ret) { |
| 3089 | return ret; |
| 3090 | } |
Greg Kurz | 1b5fc0d | 2014-06-24 19:15:31 +0200 | [diff] [blame] | 3091 | } |
| 3092 | |
Dr. David Alan Gilbert | ea43e25 | 2016-10-27 18:36:36 +0100 | [diff] [blame] | 3093 | if (vdc->vmsd) { |
| 3094 | ret = vmstate_load_state(f, vdc->vmsd, vdev, version_id); |
| 3095 | if (ret) { |
| 3096 | return ret; |
| 3097 | } |
| 3098 | } |
| 3099 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3100 | /* Subsections */ |
| 3101 | ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1); |
| 3102 | if (ret) { |
| 3103 | return ret; |
| 3104 | } |
| 3105 | |
| 3106 | if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) { |
| 3107 | vdev->device_endian = virtio_default_endian(); |
| 3108 | } |
| 3109 | |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 3110 | if (virtio_64bit_features_needed(vdev)) { |
| 3111 | /* |
| 3112 | * Subsection load filled vdev->guest_features. Run them |
| 3113 | * through virtio_set_features to sanity-check them against |
| 3114 | * host_features. |
| 3115 | */ |
| 3116 | uint64_t features64 = vdev->guest_features; |
Cornelia Huck | 6c0196d | 2015-06-04 12:34:14 +0200 | [diff] [blame] | 3117 | if (virtio_set_features_nocheck(vdev, features64) < 0) { |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 3118 | error_report("Features 0x%" PRIx64 " unsupported. " |
| 3119 | "Allowed features: 0x%" PRIx64, |
| 3120 | features64, vdev->host_features); |
| 3121 | return -1; |
| 3122 | } |
| 3123 | } else { |
Cornelia Huck | 6c0196d | 2015-06-04 12:34:14 +0200 | [diff] [blame] | 3124 | if (virtio_set_features_nocheck(vdev, features) < 0) { |
Gerd Hoffmann | 019a3ed | 2015-06-01 10:45:40 +0200 | [diff] [blame] | 3125 | error_report("Features 0x%x unsupported. " |
| 3126 | "Allowed features: 0x%" PRIx64, |
| 3127 | features, vdev->host_features); |
| 3128 | return -1; |
| 3129 | } |
| 3130 | } |
| 3131 | |
Xie Yongji | 868a8f4 | 2019-06-26 10:31:28 +0800 | [diff] [blame] | 3132 | if (!virtio_device_started(vdev, vdev->status) && |
| 3133 | !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
| 3134 | vdev->start_on_kick = true; |
| 3135 | } |
| 3136 | |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 3137 | RCU_READ_LOCK_GUARD(); |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3138 | for (i = 0; i < num; i++) { |
Cornelia Huck | ab223c9 | 2015-06-04 12:34:12 +0200 | [diff] [blame] | 3139 | if (vdev->vq[i].vring.desc) { |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3140 | uint16_t nheads; |
Stefan Hajnoczi | 874adf4 | 2017-02-22 16:37:34 +0000 | [diff] [blame] | 3141 | |
| 3142 | /* |
| 3143 | * VIRTIO-1 devices migrate desc, used, and avail ring addresses so |
| 3144 | * only the region cache needs to be set up. Legacy devices need |
| 3145 | * to calculate used and avail ring addresses based on the desc |
| 3146 | * address. |
| 3147 | */ |
| 3148 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
| 3149 | virtio_init_region_cache(vdev, i); |
| 3150 | } else { |
| 3151 | virtio_queue_update_rings(vdev, i); |
| 3152 | } |
| 3153 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3154 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3155 | vdev->vq[i].shadow_avail_idx = vdev->vq[i].last_avail_idx; |
| 3156 | vdev->vq[i].shadow_avail_wrap_counter = |
| 3157 | vdev->vq[i].last_avail_wrap_counter; |
| 3158 | continue; |
| 3159 | } |
| 3160 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3161 | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
| 3162 | /* Check it isn't doing strange things with descriptor numbers. */ |
| 3163 | if (nheads > vdev->vq[i].vring.num) { |
John Levon | 4aedda2 | 2020-11-20 18:51:07 +0000 | [diff] [blame] | 3164 | virtio_error(vdev, "VQ %d size 0x%x Guest index 0x%x " |
| 3165 | "inconsistent with Host index 0x%x: delta 0x%x", |
| 3166 | i, vdev->vq[i].vring.num, |
| 3167 | vring_avail_idx(&vdev->vq[i]), |
| 3168 | vdev->vq[i].last_avail_idx, nheads); |
| 3169 | vdev->vq[i].used_idx = 0; |
| 3170 | vdev->vq[i].shadow_avail_idx = 0; |
| 3171 | vdev->vq[i].inuse = 0; |
| 3172 | continue; |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3173 | } |
Vincenzo Maffione | b796fcd | 2016-01-31 11:29:04 +0100 | [diff] [blame] | 3174 | vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]); |
Vincenzo Maffione | be1fea9 | 2016-01-31 11:29:05 +0100 | [diff] [blame] | 3175 | vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]); |
Stefan Hajnoczi | bccdef6 | 2016-08-15 13:54:15 +0100 | [diff] [blame] | 3176 | |
| 3177 | /* |
| 3178 | * Some devices migrate VirtQueueElements that have been popped |
| 3179 | * from the avail ring but not yet returned to the used ring. |
Halil Pasic | e66bcc4 | 2016-12-19 16:44:44 +0100 | [diff] [blame] | 3180 | * Since max ring size < UINT16_MAX it's safe to use modulo |
| 3181 | * UINT16_MAX + 1 subtraction. |
Stefan Hajnoczi | bccdef6 | 2016-08-15 13:54:15 +0100 | [diff] [blame] | 3182 | */ |
Halil Pasic | e66bcc4 | 2016-12-19 16:44:44 +0100 | [diff] [blame] | 3183 | vdev->vq[i].inuse = (uint16_t)(vdev->vq[i].last_avail_idx - |
| 3184 | vdev->vq[i].used_idx); |
Stefan Hajnoczi | bccdef6 | 2016-08-15 13:54:15 +0100 | [diff] [blame] | 3185 | if (vdev->vq[i].inuse > vdev->vq[i].vring.num) { |
| 3186 | error_report("VQ %d size 0x%x < last_avail_idx 0x%x - " |
| 3187 | "used_idx 0x%x", |
| 3188 | i, vdev->vq[i].vring.num, |
| 3189 | vdev->vq[i].last_avail_idx, |
| 3190 | vdev->vq[i].used_idx); |
| 3191 | return -1; |
| 3192 | } |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3193 | } |
| 3194 | } |
| 3195 | |
Michael S. Tsirkin | 1dd7138 | 2019-10-11 15:58:03 +0200 | [diff] [blame] | 3196 | if (vdc->post_load) { |
| 3197 | ret = vdc->post_load(vdev); |
| 3198 | if (ret) { |
| 3199 | return ret; |
| 3200 | } |
| 3201 | } |
| 3202 | |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3203 | return 0; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3204 | } |
| 3205 | |
KONRAD Frederic | 6a1a8cc | 2013-04-24 10:21:22 +0200 | [diff] [blame] | 3206 | void virtio_cleanup(VirtIODevice *vdev) |
aliguori | b946a15 | 2009-04-17 17:11:08 +0000 | [diff] [blame] | 3207 | { |
Michael S. Tsirkin | 85cf2a8 | 2011-01-10 14:28:40 +0200 | [diff] [blame] | 3208 | qemu_del_vm_change_state_handler(vdev->vmstate); |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3209 | } |
| 3210 | |
Philippe Mathieu-Daudé | 538f049 | 2021-01-11 16:20:20 +0100 | [diff] [blame] | 3211 | static void virtio_vmstate_change(void *opaque, bool running, RunState state) |
Michael S. Tsirkin | 85cf2a8 | 2011-01-10 14:28:40 +0200 | [diff] [blame] | 3212 | { |
| 3213 | VirtIODevice *vdev = opaque; |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 3214 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3215 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
Xie Yongji | e57f2c3 | 2019-06-26 10:31:26 +0800 | [diff] [blame] | 3216 | bool backend_run = running && virtio_device_started(vdev, vdev->status); |
Michael S. Tsirkin | 9e8e8c4 | 2014-09-11 18:42:02 +0300 | [diff] [blame] | 3217 | vdev->vm_running = running; |
Michael S. Tsirkin | 85cf2a8 | 2011-01-10 14:28:40 +0200 | [diff] [blame] | 3218 | |
| 3219 | if (backend_run) { |
| 3220 | virtio_set_status(vdev, vdev->status); |
| 3221 | } |
| 3222 | |
KONRAD Frederic | 1c81944 | 2013-04-24 10:21:21 +0200 | [diff] [blame] | 3223 | if (k->vmstate_change) { |
| 3224 | k->vmstate_change(qbus->parent, backend_run); |
Michael S. Tsirkin | 85cf2a8 | 2011-01-10 14:28:40 +0200 | [diff] [blame] | 3225 | } |
| 3226 | |
| 3227 | if (!backend_run) { |
| 3228 | virtio_set_status(vdev, vdev->status); |
| 3229 | } |
| 3230 | } |
| 3231 | |
Gonglei | c8075ca | 2014-09-30 14:10:38 +0800 | [diff] [blame] | 3232 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
| 3233 | size_t vdev_size, const char *vdev_name) |
| 3234 | { |
| 3235 | DeviceState *vdev = data; |
| 3236 | |
Markus Armbruster | 9fc7fc4 | 2020-06-10 07:32:25 +0200 | [diff] [blame] | 3237 | object_initialize_child_with_props(proxy_obj, "virtio-backend", vdev, |
| 3238 | vdev_size, vdev_name, &error_abort, |
| 3239 | NULL); |
Gonglei | c8075ca | 2014-09-30 14:10:38 +0800 | [diff] [blame] | 3240 | qdev_alias_all_properties(vdev, proxy_obj); |
| 3241 | } |
| 3242 | |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3243 | void virtio_init(VirtIODevice *vdev, const char *name, |
| 3244 | uint16_t device_id, size_t config_size) |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3245 | { |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 3246 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3247 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
Michael S. Tsirkin | b8193ad | 2009-09-07 21:20:15 +0300 | [diff] [blame] | 3248 | int i; |
Jason Wang | e0d686b | 2015-04-23 14:21:46 +0800 | [diff] [blame] | 3249 | int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; |
| 3250 | |
| 3251 | if (nvectors) { |
| 3252 | vdev->vector_queues = |
| 3253 | g_malloc0(sizeof(*vdev->vector_queues) * nvectors); |
| 3254 | } |
| 3255 | |
Xie Yongji | 868a8f4 | 2019-06-26 10:31:28 +0800 | [diff] [blame] | 3256 | vdev->start_on_kick = false; |
Xie Yongji | badaf79 | 2019-03-20 19:26:40 +0800 | [diff] [blame] | 3257 | vdev->started = false; |
Paul Brook | 53c25ce | 2009-05-18 14:51:59 +0100 | [diff] [blame] | 3258 | vdev->device_id = device_id; |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3259 | vdev->status = 0; |
Stefan Hajnoczi | d73415a | 2020-09-23 11:56:46 +0100 | [diff] [blame] | 3260 | qatomic_set(&vdev->isr, 0); |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3261 | vdev->queue_sel = 0; |
Michael S. Tsirkin | 7055e68 | 2009-06-21 19:50:13 +0300 | [diff] [blame] | 3262 | vdev->config_vector = VIRTIO_NO_VECTOR; |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 3263 | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX); |
Luiz Capitulino | 1354869 | 2011-07-29 15:36:43 -0300 | [diff] [blame] | 3264 | vdev->vm_running = runstate_is_running(); |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 3265 | vdev->broken = false; |
Jason Wang | 87b3bd1 | 2015-05-29 14:15:31 +0800 | [diff] [blame] | 3266 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
Michael S. Tsirkin | b8193ad | 2009-09-07 21:20:15 +0300 | [diff] [blame] | 3267 | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3268 | vdev->vq[i].vdev = vdev; |
Jason Wang | e78a2b4 | 2013-01-30 19:12:37 +0800 | [diff] [blame] | 3269 | vdev->vq[i].queue_index = i; |
Stefan Hajnoczi | fcccb27 | 2019-11-05 15:09:46 +0100 | [diff] [blame] | 3270 | vdev->vq[i].host_notifier_enabled = false; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3271 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3272 | |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3273 | vdev->name = name; |
| 3274 | vdev->config_len = config_size; |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3275 | if (vdev->config_len) { |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 3276 | vdev->config = g_malloc0(config_size); |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3277 | } else { |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3278 | vdev->config = NULL; |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3279 | } |
Stefan Hajnoczi | 1a8c091 | 2019-06-20 18:37:09 +0100 | [diff] [blame] | 3280 | vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev), |
| 3281 | virtio_vmstate_change, vdev); |
Greg Kurz | 616a655 | 2014-06-24 19:38:54 +0200 | [diff] [blame] | 3282 | vdev->device_endian = virtio_default_endian(); |
Victor Kaplansky | 5669655 | 2016-02-18 16:12:23 +0200 | [diff] [blame] | 3283 | vdev->use_guest_notifier_mask = true; |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3284 | } |
aliguori | 967f97f | 2008-12-04 19:38:57 +0000 | [diff] [blame] | 3285 | |
Cornelia Huck | 7c78bdd | 2020-07-07 12:54:45 +0200 | [diff] [blame] | 3286 | /* |
| 3287 | * Only devices that have already been around prior to defining the virtio |
| 3288 | * standard support legacy mode; this includes devices not specified in the |
| 3289 | * standard. All newer devices conform to the virtio standard only. |
| 3290 | */ |
| 3291 | bool virtio_legacy_allowed(VirtIODevice *vdev) |
| 3292 | { |
| 3293 | switch (vdev->device_id) { |
| 3294 | case VIRTIO_ID_NET: |
| 3295 | case VIRTIO_ID_BLOCK: |
| 3296 | case VIRTIO_ID_CONSOLE: |
| 3297 | case VIRTIO_ID_RNG: |
| 3298 | case VIRTIO_ID_BALLOON: |
| 3299 | case VIRTIO_ID_RPMSG: |
| 3300 | case VIRTIO_ID_SCSI: |
| 3301 | case VIRTIO_ID_9P: |
| 3302 | case VIRTIO_ID_RPROC_SERIAL: |
| 3303 | case VIRTIO_ID_CAIF: |
| 3304 | return true; |
| 3305 | default: |
| 3306 | return false; |
| 3307 | } |
| 3308 | } |
| 3309 | |
Stefano Garzarella | d55f518 | 2020-09-21 14:25:03 +0200 | [diff] [blame] | 3310 | bool virtio_legacy_check_disabled(VirtIODevice *vdev) |
| 3311 | { |
| 3312 | return vdev->disable_legacy_check; |
| 3313 | } |
| 3314 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 3315 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3316 | { |
| 3317 | return vdev->vq[n].vring.desc; |
| 3318 | } |
| 3319 | |
Laurent Vivier | 0c9753e | 2020-07-27 17:33:19 +0200 | [diff] [blame] | 3320 | bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n) |
| 3321 | { |
| 3322 | return virtio_queue_get_desc_addr(vdev, n) != 0; |
| 3323 | } |
| 3324 | |
Jason Wang | 23bfaf7 | 2019-03-25 11:40:36 +0800 | [diff] [blame] | 3325 | bool virtio_queue_enabled(VirtIODevice *vdev, int n) |
| 3326 | { |
Jason Wang | b2a5f62 | 2020-07-01 22:55:27 +0800 | [diff] [blame] | 3327 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3328 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 3329 | |
| 3330 | if (k->queue_enabled) { |
| 3331 | return k->queue_enabled(qbus->parent, n); |
| 3332 | } |
Laurent Vivier | 0c9753e | 2020-07-27 17:33:19 +0200 | [diff] [blame] | 3333 | return virtio_queue_enabled_legacy(vdev, n); |
Jason Wang | 23bfaf7 | 2019-03-25 11:40:36 +0800 | [diff] [blame] | 3334 | } |
| 3335 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 3336 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3337 | { |
| 3338 | return vdev->vq[n].vring.avail; |
| 3339 | } |
| 3340 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 3341 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3342 | { |
| 3343 | return vdev->vq[n].vring.used; |
| 3344 | } |
| 3345 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 3346 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3347 | { |
| 3348 | return sizeof(VRingDesc) * vdev->vq[n].vring.num; |
| 3349 | } |
| 3350 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 3351 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3352 | { |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 3353 | int s; |
| 3354 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3355 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3356 | return sizeof(struct VRingPackedDescEvent); |
| 3357 | } |
| 3358 | |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 3359 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3360 | return offsetof(VRingAvail, ring) + |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 3361 | sizeof(uint16_t) * vdev->vq[n].vring.num + s; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3362 | } |
| 3363 | |
Avi Kivity | a8170e5 | 2012-10-23 12:30:10 +0200 | [diff] [blame] | 3364 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3365 | { |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 3366 | int s; |
| 3367 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3368 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3369 | return sizeof(struct VRingPackedDescEvent); |
| 3370 | } |
| 3371 | |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 3372 | s = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3373 | return offsetof(VRingUsed, ring) + |
Wei Xu | f90cda6 | 2019-10-25 10:35:21 +0200 | [diff] [blame] | 3374 | sizeof(VRingUsedElem) * vdev->vq[n].vring.num + s; |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3375 | } |
| 3376 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3377 | static unsigned int virtio_queue_packed_get_last_avail_idx(VirtIODevice *vdev, |
| 3378 | int n) |
| 3379 | { |
| 3380 | unsigned int avail, used; |
| 3381 | |
| 3382 | avail = vdev->vq[n].last_avail_idx; |
| 3383 | avail |= ((uint16_t)vdev->vq[n].last_avail_wrap_counter) << 15; |
| 3384 | |
| 3385 | used = vdev->vq[n].used_idx; |
| 3386 | used |= ((uint16_t)vdev->vq[n].used_wrap_counter) << 15; |
| 3387 | |
| 3388 | return avail | used << 16; |
| 3389 | } |
| 3390 | |
| 3391 | static uint16_t virtio_queue_split_get_last_avail_idx(VirtIODevice *vdev, |
| 3392 | int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3393 | { |
| 3394 | return vdev->vq[n].last_avail_idx; |
| 3395 | } |
| 3396 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3397 | unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3398 | { |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3399 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3400 | return virtio_queue_packed_get_last_avail_idx(vdev, n); |
| 3401 | } else { |
| 3402 | return virtio_queue_split_get_last_avail_idx(vdev, n); |
| 3403 | } |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3404 | } |
| 3405 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3406 | static void virtio_queue_packed_set_last_avail_idx(VirtIODevice *vdev, |
| 3407 | int n, unsigned int idx) |
| 3408 | { |
| 3409 | struct VirtQueue *vq = &vdev->vq[n]; |
| 3410 | |
| 3411 | vq->last_avail_idx = vq->shadow_avail_idx = idx & 0x7fff; |
| 3412 | vq->last_avail_wrap_counter = |
| 3413 | vq->shadow_avail_wrap_counter = !!(idx & 0x8000); |
| 3414 | idx >>= 16; |
| 3415 | vq->used_idx = idx & 0x7ffff; |
| 3416 | vq->used_wrap_counter = !!(idx & 0x8000); |
| 3417 | } |
| 3418 | |
| 3419 | static void virtio_queue_split_set_last_avail_idx(VirtIODevice *vdev, |
| 3420 | int n, unsigned int idx) |
| 3421 | { |
| 3422 | vdev->vq[n].last_avail_idx = idx; |
| 3423 | vdev->vq[n].shadow_avail_idx = idx; |
| 3424 | } |
| 3425 | |
| 3426 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, |
| 3427 | unsigned int idx) |
| 3428 | { |
| 3429 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3430 | virtio_queue_packed_set_last_avail_idx(vdev, n, idx); |
| 3431 | } else { |
| 3432 | virtio_queue_split_set_last_avail_idx(vdev, n, idx); |
| 3433 | } |
| 3434 | } |
| 3435 | |
| 3436 | static void virtio_queue_packed_restore_last_avail_idx(VirtIODevice *vdev, |
| 3437 | int n) |
| 3438 | { |
| 3439 | /* We don't have a reference like avail idx in shared memory */ |
| 3440 | return; |
| 3441 | } |
| 3442 | |
| 3443 | static void virtio_queue_split_restore_last_avail_idx(VirtIODevice *vdev, |
| 3444 | int n) |
Maxime Coquelin | 2d4ba6c | 2017-11-16 19:48:34 +0100 | [diff] [blame] | 3445 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 3446 | RCU_READ_LOCK_GUARD(); |
Maxime Coquelin | 2d4ba6c | 2017-11-16 19:48:34 +0100 | [diff] [blame] | 3447 | if (vdev->vq[n].vring.desc) { |
| 3448 | vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]); |
| 3449 | vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx; |
| 3450 | } |
Maxime Coquelin | 2d4ba6c | 2017-11-16 19:48:34 +0100 | [diff] [blame] | 3451 | } |
| 3452 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3453 | void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n) |
| 3454 | { |
| 3455 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3456 | virtio_queue_packed_restore_last_avail_idx(vdev, n); |
| 3457 | } else { |
| 3458 | virtio_queue_split_restore_last_avail_idx(vdev, n); |
| 3459 | } |
| 3460 | } |
| 3461 | |
| 3462 | static void virtio_queue_packed_update_used_idx(VirtIODevice *vdev, int n) |
| 3463 | { |
| 3464 | /* used idx was updated through set_last_avail_idx() */ |
| 3465 | return; |
| 3466 | } |
| 3467 | |
| 3468 | static void virtio_split_packed_update_used_idx(VirtIODevice *vdev, int n) |
Yuri Benditovich | 312d3b3 | 2016-12-13 10:12:05 +0200 | [diff] [blame] | 3469 | { |
Dr. David Alan Gilbert | b5f53d0 | 2019-10-28 16:11:09 +0000 | [diff] [blame] | 3470 | RCU_READ_LOCK_GUARD(); |
Paolo Bonzini | ca0176a | 2017-01-27 16:40:19 +0100 | [diff] [blame] | 3471 | if (vdev->vq[n].vring.desc) { |
| 3472 | vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]); |
| 3473 | } |
Yuri Benditovich | 312d3b3 | 2016-12-13 10:12:05 +0200 | [diff] [blame] | 3474 | } |
| 3475 | |
Jason Wang | 86044b2 | 2019-10-25 10:35:24 +0200 | [diff] [blame] | 3476 | void virtio_queue_update_used_idx(VirtIODevice *vdev, int n) |
| 3477 | { |
| 3478 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { |
| 3479 | return virtio_queue_packed_update_used_idx(vdev, n); |
| 3480 | } else { |
| 3481 | return virtio_split_packed_update_used_idx(vdev, n); |
| 3482 | } |
| 3483 | } |
| 3484 | |
Stefan Hajnoczi | 6793dfd | 2013-08-12 11:08:09 +0200 | [diff] [blame] | 3485 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n) |
| 3486 | { |
| 3487 | vdev->vq[n].signalled_used_valid = false; |
| 3488 | } |
| 3489 | |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3490 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) |
| 3491 | { |
| 3492 | return vdev->vq + n; |
| 3493 | } |
| 3494 | |
Jason Wang | e78a2b4 | 2013-01-30 19:12:37 +0800 | [diff] [blame] | 3495 | uint16_t virtio_get_queue_index(VirtQueue *vq) |
| 3496 | { |
| 3497 | return vq->queue_index; |
| 3498 | } |
| 3499 | |
Paolo Bonzini | 15b2bd1 | 2012-07-05 17:16:30 +0200 | [diff] [blame] | 3500 | static void virtio_queue_guest_notifier_read(EventNotifier *n) |
| 3501 | { |
| 3502 | VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); |
| 3503 | if (event_notifier_test_and_clear(n)) { |
Michael S. Tsirkin | b4b9862 | 2017-02-17 04:52:16 +0200 | [diff] [blame] | 3504 | virtio_irq(vq); |
Paolo Bonzini | 15b2bd1 | 2012-07-05 17:16:30 +0200 | [diff] [blame] | 3505 | } |
| 3506 | } |
| 3507 | |
| 3508 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, |
| 3509 | bool with_irqfd) |
| 3510 | { |
| 3511 | if (assign && !with_irqfd) { |
Paolo Bonzini | d6da1e9 | 2017-01-10 11:54:52 +0100 | [diff] [blame] | 3512 | event_notifier_set_handler(&vq->guest_notifier, |
Paolo Bonzini | 15b2bd1 | 2012-07-05 17:16:30 +0200 | [diff] [blame] | 3513 | virtio_queue_guest_notifier_read); |
| 3514 | } else { |
Paolo Bonzini | d6da1e9 | 2017-01-10 11:54:52 +0100 | [diff] [blame] | 3515 | event_notifier_set_handler(&vq->guest_notifier, NULL); |
Paolo Bonzini | 15b2bd1 | 2012-07-05 17:16:30 +0200 | [diff] [blame] | 3516 | } |
| 3517 | if (!assign) { |
| 3518 | /* Test and clear notifier before closing it, |
| 3519 | * in case poll callback didn't have time to run. */ |
| 3520 | virtio_queue_guest_notifier_read(&vq->guest_notifier); |
| 3521 | } |
| 3522 | } |
| 3523 | |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3524 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
| 3525 | { |
| 3526 | return &vq->guest_notifier; |
| 3527 | } |
Paolo Bonzini | b1f416a | 2012-07-05 17:16:29 +0200 | [diff] [blame] | 3528 | |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 3529 | static void virtio_queue_host_notifier_aio_read(EventNotifier *n) |
Paolo Bonzini | b1f416a | 2012-07-05 17:16:29 +0200 | [diff] [blame] | 3530 | { |
| 3531 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); |
| 3532 | if (event_notifier_test_and_clear(n)) { |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 3533 | virtio_queue_notify_aio_vq(vq); |
Paolo Bonzini | b1f416a | 2012-07-05 17:16:29 +0200 | [diff] [blame] | 3534 | } |
| 3535 | } |
| 3536 | |
Stefan Hajnoczi | a7c8215 | 2016-12-01 19:26:50 +0000 | [diff] [blame] | 3537 | static void virtio_queue_host_notifier_aio_poll_begin(EventNotifier *n) |
| 3538 | { |
| 3539 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); |
| 3540 | |
| 3541 | virtio_queue_set_notification(vq, 0); |
| 3542 | } |
| 3543 | |
Stefan Hajnoczi | 0062ea0 | 2016-12-01 19:26:43 +0000 | [diff] [blame] | 3544 | static bool virtio_queue_host_notifier_aio_poll(void *opaque) |
| 3545 | { |
| 3546 | EventNotifier *n = opaque; |
| 3547 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); |
| 3548 | |
Paolo Bonzini | dd3dd4b | 2017-02-23 09:51:30 +0100 | [diff] [blame] | 3549 | if (!vq->vring.desc || virtio_queue_empty(vq)) { |
Stefan Hajnoczi | 0062ea0 | 2016-12-01 19:26:43 +0000 | [diff] [blame] | 3550 | return false; |
| 3551 | } |
| 3552 | |
Stefan Hajnoczi | d0435bc | 2019-12-09 21:09:57 +0000 | [diff] [blame] | 3553 | return virtio_queue_notify_aio_vq(vq); |
Stefan Hajnoczi | 0062ea0 | 2016-12-01 19:26:43 +0000 | [diff] [blame] | 3554 | } |
| 3555 | |
Stefan Hajnoczi | a7c8215 | 2016-12-01 19:26:50 +0000 | [diff] [blame] | 3556 | static void virtio_queue_host_notifier_aio_poll_end(EventNotifier *n) |
| 3557 | { |
| 3558 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); |
| 3559 | |
| 3560 | /* Caller polls once more after this to catch requests that race with us */ |
| 3561 | virtio_queue_set_notification(vq, 1); |
| 3562 | } |
| 3563 | |
Paolo Bonzini | a1afb60 | 2016-02-14 18:17:06 +0100 | [diff] [blame] | 3564 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, |
Fam Zheng | 0793169 | 2017-02-09 16:40:47 +0800 | [diff] [blame] | 3565 | VirtIOHandleAIOOutput handle_output) |
Paolo Bonzini | a1afb60 | 2016-02-14 18:17:06 +0100 | [diff] [blame] | 3566 | { |
Paolo Bonzini | a378b49 | 2016-04-06 12:16:28 +0200 | [diff] [blame] | 3567 | if (handle_output) { |
| 3568 | vq->handle_aio_output = handle_output; |
Paolo Bonzini | a1afb60 | 2016-02-14 18:17:06 +0100 | [diff] [blame] | 3569 | aio_set_event_notifier(ctx, &vq->host_notifier, true, |
Stefan Hajnoczi | 0062ea0 | 2016-12-01 19:26:43 +0000 | [diff] [blame] | 3570 | virtio_queue_host_notifier_aio_read, |
| 3571 | virtio_queue_host_notifier_aio_poll); |
Stefan Hajnoczi | a7c8215 | 2016-12-01 19:26:50 +0000 | [diff] [blame] | 3572 | aio_set_event_notifier_poll(ctx, &vq->host_notifier, |
| 3573 | virtio_queue_host_notifier_aio_poll_begin, |
| 3574 | virtio_queue_host_notifier_aio_poll_end); |
Paolo Bonzini | a1afb60 | 2016-02-14 18:17:06 +0100 | [diff] [blame] | 3575 | } else { |
Stefan Hajnoczi | f6a51c8 | 2016-12-01 19:26:41 +0000 | [diff] [blame] | 3576 | aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL); |
Paolo Bonzini | a1afb60 | 2016-02-14 18:17:06 +0100 | [diff] [blame] | 3577 | /* Test and clear notifier before after disabling event, |
| 3578 | * in case poll callback didn't have time to run. */ |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 3579 | virtio_queue_host_notifier_aio_read(&vq->host_notifier); |
Paolo Bonzini | a378b49 | 2016-04-06 12:16:28 +0200 | [diff] [blame] | 3580 | vq->handle_aio_output = NULL; |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 3581 | } |
| 3582 | } |
| 3583 | |
Paolo Bonzini | fa283a4 | 2016-10-21 22:48:15 +0200 | [diff] [blame] | 3584 | void virtio_queue_host_notifier_read(EventNotifier *n) |
Michael S. Tsirkin | 344dc16 | 2016-04-06 12:16:25 +0200 | [diff] [blame] | 3585 | { |
| 3586 | VirtQueue *vq = container_of(n, VirtQueue, host_notifier); |
| 3587 | if (event_notifier_test_and_clear(n)) { |
| 3588 | virtio_queue_notify_vq(vq); |
Paolo Bonzini | a1afb60 | 2016-02-14 18:17:06 +0100 | [diff] [blame] | 3589 | } |
| 3590 | } |
| 3591 | |
Michael S. Tsirkin | 1cbdabe | 2010-03-17 13:08:02 +0200 | [diff] [blame] | 3592 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
| 3593 | { |
| 3594 | return &vq->host_notifier; |
| 3595 | } |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3596 | |
Stefan Hajnoczi | fcccb27 | 2019-11-05 15:09:46 +0100 | [diff] [blame] | 3597 | void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled) |
| 3598 | { |
| 3599 | vq->host_notifier_enabled = enabled; |
| 3600 | } |
| 3601 | |
Tiwei Bie | 6f80e61 | 2018-04-12 23:12:30 +0800 | [diff] [blame] | 3602 | int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, |
| 3603 | MemoryRegion *mr, bool assign) |
| 3604 | { |
| 3605 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3606 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 3607 | |
| 3608 | if (k->set_host_notifier_mr) { |
| 3609 | return k->set_host_notifier_mr(qbus->parent, n, mr, assign); |
| 3610 | } |
| 3611 | |
| 3612 | return -1; |
| 3613 | } |
| 3614 | |
KONRAD Frederic | 1034e9c | 2013-04-30 16:08:48 +0200 | [diff] [blame] | 3615 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name) |
| 3616 | { |
Markus Armbruster | 9e28840 | 2014-06-06 18:43:29 +0200 | [diff] [blame] | 3617 | g_free(vdev->bus_name); |
Markus Armbruster | 80e0090 | 2014-06-06 18:43:30 +0200 | [diff] [blame] | 3618 | vdev->bus_name = g_strdup(bus_name); |
KONRAD Frederic | 1034e9c | 2013-04-30 16:08:48 +0200 | [diff] [blame] | 3619 | } |
| 3620 | |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 3621 | void GCC_FMT_ATTR(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...) |
| 3622 | { |
| 3623 | va_list ap; |
| 3624 | |
| 3625 | va_start(ap, fmt); |
| 3626 | error_vreport(fmt, ap); |
| 3627 | va_end(ap); |
| 3628 | |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 3629 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
Michael S. Tsirkin | 8fc47c8 | 2017-12-13 21:59:54 +0200 | [diff] [blame] | 3630 | vdev->status = vdev->status | VIRTIO_CONFIG_S_NEEDS_RESET; |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 3631 | virtio_notify_config(vdev); |
| 3632 | } |
Greg Kurz | 66453cf | 2017-05-17 10:17:51 +0200 | [diff] [blame] | 3633 | |
| 3634 | vdev->broken = true; |
Stefan Hajnoczi | f5ed366 | 2016-09-21 16:52:19 +0100 | [diff] [blame] | 3635 | } |
| 3636 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3637 | static void virtio_memory_listener_commit(MemoryListener *listener) |
| 3638 | { |
| 3639 | VirtIODevice *vdev = container_of(listener, VirtIODevice, listener); |
| 3640 | int i; |
| 3641 | |
| 3642 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| 3643 | if (vdev->vq[i].vring.num == 0) { |
| 3644 | break; |
| 3645 | } |
| 3646 | virtio_init_region_cache(vdev, i); |
| 3647 | } |
| 3648 | } |
| 3649 | |
Andreas Färber | 1d244b4 | 2013-07-30 00:50:27 +0200 | [diff] [blame] | 3650 | static void virtio_device_realize(DeviceState *dev, Error **errp) |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3651 | { |
Andreas Färber | 1d244b4 | 2013-07-30 00:50:27 +0200 | [diff] [blame] | 3652 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 3653 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
| 3654 | Error *err = NULL; |
| 3655 | |
Dr. David Alan Gilbert | ea43e25 | 2016-10-27 18:36:36 +0100 | [diff] [blame] | 3656 | /* Devices should either use vmsd or the load/save methods */ |
| 3657 | assert(!vdc->vmsd || !vdc->load); |
| 3658 | |
Andreas Färber | 1d244b4 | 2013-07-30 00:50:27 +0200 | [diff] [blame] | 3659 | if (vdc->realize != NULL) { |
| 3660 | vdc->realize(dev, &err); |
| 3661 | if (err != NULL) { |
| 3662 | error_propagate(errp, err); |
| 3663 | return; |
| 3664 | } |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3665 | } |
Jason Wang | e839804 | 2015-05-29 14:15:25 +0800 | [diff] [blame] | 3666 | |
| 3667 | virtio_bus_device_plugged(vdev, &err); |
| 3668 | if (err != NULL) { |
| 3669 | error_propagate(errp, err); |
Markus Armbruster | b69c3c2 | 2020-05-05 17:29:24 +0200 | [diff] [blame] | 3670 | vdc->unrealize(dev); |
Jason Wang | e839804 | 2015-05-29 14:15:25 +0800 | [diff] [blame] | 3671 | return; |
| 3672 | } |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3673 | |
| 3674 | vdev->listener.commit = virtio_memory_listener_commit; |
| 3675 | memory_listener_register(&vdev->listener, vdev->dma_as); |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3676 | } |
| 3677 | |
Markus Armbruster | b69c3c2 | 2020-05-05 17:29:24 +0200 | [diff] [blame] | 3678 | static void virtio_device_unrealize(DeviceState *dev) |
KONRAD Frederic | 1034e9c | 2013-04-30 16:08:48 +0200 | [diff] [blame] | 3679 | { |
Andreas Färber | 1d244b4 | 2013-07-30 00:50:27 +0200 | [diff] [blame] | 3680 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
Andreas Färber | 306ec6c | 2013-07-30 03:50:44 +0200 | [diff] [blame] | 3681 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev); |
KONRAD Frederic | 1034e9c | 2013-04-30 16:08:48 +0200 | [diff] [blame] | 3682 | |
Eugenio Pérez | f6ab64c | 2021-01-25 20:25:05 +0100 | [diff] [blame] | 3683 | memory_listener_unregister(&vdev->listener); |
Paolo Bonzini | 83d0704 | 2013-12-20 19:48:51 +0100 | [diff] [blame] | 3684 | virtio_bus_device_unplugged(vdev); |
| 3685 | |
Andreas Färber | 306ec6c | 2013-07-30 03:50:44 +0200 | [diff] [blame] | 3686 | if (vdc->unrealize != NULL) { |
Markus Armbruster | b69c3c2 | 2020-05-05 17:29:24 +0200 | [diff] [blame] | 3687 | vdc->unrealize(dev); |
Paolo Bonzini | 5e96f5d | 2013-09-20 13:59:08 +0200 | [diff] [blame] | 3688 | } |
Andreas Färber | 1d244b4 | 2013-07-30 00:50:27 +0200 | [diff] [blame] | 3689 | |
Markus Armbruster | 9e28840 | 2014-06-06 18:43:29 +0200 | [diff] [blame] | 3690 | g_free(vdev->bus_name); |
| 3691 | vdev->bus_name = NULL; |
KONRAD Frederic | 1034e9c | 2013-04-30 16:08:48 +0200 | [diff] [blame] | 3692 | } |
| 3693 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3694 | static void virtio_device_free_virtqueues(VirtIODevice *vdev) |
| 3695 | { |
| 3696 | int i; |
| 3697 | if (!vdev->vq) { |
| 3698 | return; |
| 3699 | } |
| 3700 | |
| 3701 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3702 | if (vdev->vq[i].vring.num == 0) { |
| 3703 | break; |
| 3704 | } |
Jason Wang | e0e2d64 | 2017-03-15 19:48:31 +0800 | [diff] [blame] | 3705 | virtio_virtqueue_reset_region_cache(&vdev->vq[i]); |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3706 | } |
| 3707 | g_free(vdev->vq); |
| 3708 | } |
| 3709 | |
| 3710 | static void virtio_device_instance_finalize(Object *obj) |
| 3711 | { |
| 3712 | VirtIODevice *vdev = VIRTIO_DEVICE(obj); |
| 3713 | |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3714 | virtio_device_free_virtqueues(vdev); |
| 3715 | |
| 3716 | g_free(vdev->config); |
| 3717 | g_free(vdev->vector_queues); |
| 3718 | } |
| 3719 | |
Cornelia Huck | 6b8f102 | 2015-05-26 16:34:47 +0200 | [diff] [blame] | 3720 | static Property virtio_properties[] = { |
| 3721 | DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features), |
Xie Yongji | e57f2c3 | 2019-06-26 10:31:26 +0800 | [diff] [blame] | 3722 | DEFINE_PROP_BOOL("use-started", VirtIODevice, use_started, true), |
Michael Roth | 9d7bd08 | 2019-11-19 18:50:03 -0600 | [diff] [blame] | 3723 | DEFINE_PROP_BOOL("use-disabled-flag", VirtIODevice, use_disabled_flag, true), |
Stefano Garzarella | d55f518 | 2020-09-21 14:25:03 +0200 | [diff] [blame] | 3724 | DEFINE_PROP_BOOL("x-disable-legacy-check", VirtIODevice, |
| 3725 | disable_legacy_check, false), |
Cornelia Huck | 6b8f102 | 2015-05-26 16:34:47 +0200 | [diff] [blame] | 3726 | DEFINE_PROP_END_OF_LIST(), |
| 3727 | }; |
| 3728 | |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3729 | static int virtio_device_start_ioeventfd_impl(VirtIODevice *vdev) |
| 3730 | { |
| 3731 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3732 | int i, n, r, err; |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3733 | |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3734 | memory_region_transaction_begin(); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3735 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
Paolo Bonzini | fa283a4 | 2016-10-21 22:48:15 +0200 | [diff] [blame] | 3736 | VirtQueue *vq = &vdev->vq[n]; |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3737 | if (!virtio_queue_get_num(vdev, n)) { |
| 3738 | continue; |
| 3739 | } |
Paolo Bonzini | ed08a2a | 2016-10-21 22:48:14 +0200 | [diff] [blame] | 3740 | r = virtio_bus_set_host_notifier(qbus, n, true); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3741 | if (r < 0) { |
| 3742 | err = r; |
| 3743 | goto assign_error; |
| 3744 | } |
Paolo Bonzini | d6da1e9 | 2017-01-10 11:54:52 +0100 | [diff] [blame] | 3745 | event_notifier_set_handler(&vq->host_notifier, |
Paolo Bonzini | fa283a4 | 2016-10-21 22:48:15 +0200 | [diff] [blame] | 3746 | virtio_queue_host_notifier_read); |
Paolo Bonzini | 6019f3b | 2016-10-21 22:48:12 +0200 | [diff] [blame] | 3747 | } |
| 3748 | |
| 3749 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
| 3750 | /* Kick right away to begin processing requests already in vring */ |
| 3751 | VirtQueue *vq = &vdev->vq[n]; |
| 3752 | if (!vq->vring.num) { |
| 3753 | continue; |
| 3754 | } |
| 3755 | event_notifier_set(&vq->host_notifier); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3756 | } |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3757 | memory_region_transaction_commit(); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3758 | return 0; |
| 3759 | |
| 3760 | assign_error: |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3761 | i = n; /* save n for a second iteration after transaction is committed. */ |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3762 | while (--n >= 0) { |
Paolo Bonzini | fa283a4 | 2016-10-21 22:48:15 +0200 | [diff] [blame] | 3763 | VirtQueue *vq = &vdev->vq[n]; |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3764 | if (!virtio_queue_get_num(vdev, n)) { |
| 3765 | continue; |
| 3766 | } |
| 3767 | |
Paolo Bonzini | d6da1e9 | 2017-01-10 11:54:52 +0100 | [diff] [blame] | 3768 | event_notifier_set_handler(&vq->host_notifier, NULL); |
Paolo Bonzini | ed08a2a | 2016-10-21 22:48:14 +0200 | [diff] [blame] | 3769 | r = virtio_bus_set_host_notifier(qbus, n, false); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3770 | assert(r >= 0); |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3771 | } |
| 3772 | memory_region_transaction_commit(); |
| 3773 | |
| 3774 | while (--i >= 0) { |
| 3775 | if (!virtio_queue_get_num(vdev, i)) { |
| 3776 | continue; |
| 3777 | } |
| 3778 | virtio_bus_cleanup_host_notifier(qbus, i); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3779 | } |
| 3780 | return err; |
| 3781 | } |
| 3782 | |
| 3783 | int virtio_device_start_ioeventfd(VirtIODevice *vdev) |
| 3784 | { |
| 3785 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3786 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 3787 | |
| 3788 | return virtio_bus_start_ioeventfd(vbus); |
| 3789 | } |
| 3790 | |
| 3791 | static void virtio_device_stop_ioeventfd_impl(VirtIODevice *vdev) |
| 3792 | { |
| 3793 | VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3794 | int n, r; |
| 3795 | |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3796 | memory_region_transaction_begin(); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3797 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
Paolo Bonzini | fa283a4 | 2016-10-21 22:48:15 +0200 | [diff] [blame] | 3798 | VirtQueue *vq = &vdev->vq[n]; |
| 3799 | |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3800 | if (!virtio_queue_get_num(vdev, n)) { |
| 3801 | continue; |
| 3802 | } |
Paolo Bonzini | d6da1e9 | 2017-01-10 11:54:52 +0100 | [diff] [blame] | 3803 | event_notifier_set_handler(&vq->host_notifier, NULL); |
Paolo Bonzini | ed08a2a | 2016-10-21 22:48:14 +0200 | [diff] [blame] | 3804 | r = virtio_bus_set_host_notifier(qbus, n, false); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3805 | assert(r >= 0); |
Gal Hammer | 710fccf | 2018-01-29 16:20:57 +0200 | [diff] [blame] | 3806 | } |
| 3807 | memory_region_transaction_commit(); |
| 3808 | |
| 3809 | for (n = 0; n < VIRTIO_QUEUE_MAX; n++) { |
| 3810 | if (!virtio_queue_get_num(vdev, n)) { |
| 3811 | continue; |
| 3812 | } |
Gal Hammer | 7614361 | 2018-01-29 16:20:56 +0200 | [diff] [blame] | 3813 | virtio_bus_cleanup_host_notifier(qbus, n); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3814 | } |
| 3815 | } |
| 3816 | |
Paolo Bonzini | 310837d | 2016-11-18 16:07:00 +0100 | [diff] [blame] | 3817 | int virtio_device_grab_ioeventfd(VirtIODevice *vdev) |
| 3818 | { |
| 3819 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3820 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 3821 | |
| 3822 | return virtio_bus_grab_ioeventfd(vbus); |
| 3823 | } |
| 3824 | |
| 3825 | void virtio_device_release_ioeventfd(VirtIODevice *vdev) |
| 3826 | { |
| 3827 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3828 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 3829 | |
| 3830 | virtio_bus_release_ioeventfd(vbus); |
| 3831 | } |
| 3832 | |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3833 | static void virtio_device_class_init(ObjectClass *klass, void *data) |
| 3834 | { |
| 3835 | /* Set the default value here. */ |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3836 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3837 | DeviceClass *dc = DEVICE_CLASS(klass); |
Andreas Färber | 1d244b4 | 2013-07-30 00:50:27 +0200 | [diff] [blame] | 3838 | |
| 3839 | dc->realize = virtio_device_realize; |
| 3840 | dc->unrealize = virtio_device_unrealize; |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3841 | dc->bus_type = TYPE_VIRTIO_BUS; |
Marc-André Lureau | 4f67d30 | 2020-01-10 19:30:32 +0400 | [diff] [blame] | 3842 | device_class_set_props(dc, virtio_properties); |
Paolo Bonzini | ff4c07d | 2016-10-21 22:48:07 +0200 | [diff] [blame] | 3843 | vdc->start_ioeventfd = virtio_device_start_ioeventfd_impl; |
| 3844 | vdc->stop_ioeventfd = virtio_device_stop_ioeventfd_impl; |
Michael S. Tsirkin | 9b706db | 2016-11-04 12:04:23 +0200 | [diff] [blame] | 3845 | |
| 3846 | vdc->legacy_features |= VIRTIO_LEGACY_FEATURES; |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3847 | } |
| 3848 | |
Paolo Bonzini | 8e93cef | 2016-10-21 22:48:08 +0200 | [diff] [blame] | 3849 | bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev) |
| 3850 | { |
| 3851 | BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); |
| 3852 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 3853 | |
| 3854 | return virtio_bus_ioeventfd_enabled(vbus); |
| 3855 | } |
| 3856 | |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3857 | static const TypeInfo virtio_device_info = { |
| 3858 | .name = TYPE_VIRTIO_DEVICE, |
| 3859 | .parent = TYPE_DEVICE, |
| 3860 | .instance_size = sizeof(VirtIODevice), |
| 3861 | .class_init = virtio_device_class_init, |
Paolo Bonzini | c611c76 | 2017-01-27 16:40:17 +0100 | [diff] [blame] | 3862 | .instance_finalize = virtio_device_instance_finalize, |
KONRAD Frederic | 8e05db9 | 2013-01-15 00:08:02 +0100 | [diff] [blame] | 3863 | .abstract = true, |
| 3864 | .class_size = sizeof(VirtioDeviceClass), |
| 3865 | }; |
| 3866 | |
| 3867 | static void virtio_register_types(void) |
| 3868 | { |
| 3869 | type_register_static(&virtio_device_info); |
| 3870 | } |
| 3871 | |
| 3872 | type_init(virtio_register_types) |