| /* |
| * Virtio MMIO bindings |
| * |
| * Copyright (c) 2011 Linaro Limited |
| * |
| * Author: |
| * Peter Maydell <peter.maydell@linaro.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "standard-headers/linux/virtio_mmio.h" |
| #include "hw/irq.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/sysbus.h" |
| #include "hw/virtio/virtio.h" |
| #include "migration/qemu-file-types.h" |
| #include "qemu/host-utils.h" |
| #include "qemu/module.h" |
| #include "sysemu/kvm.h" |
| #include "sysemu/replay.h" |
| #include "hw/virtio/virtio-mmio.h" |
| #include "qemu/error-report.h" |
| #include "qemu/log.h" |
| #include "trace.h" |
| |
| static bool virtio_mmio_ioeventfd_enabled(DeviceState *d) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| |
| return (proxy->flags & VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD) != 0; |
| } |
| |
| static int virtio_mmio_ioeventfd_assign(DeviceState *d, |
| EventNotifier *notifier, |
| int n, bool assign) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| |
| if (assign) { |
| memory_region_add_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4, |
| true, n, notifier); |
| } else { |
| memory_region_del_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4, |
| true, n, notifier); |
| } |
| return 0; |
| } |
| |
| static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy) |
| { |
| virtio_bus_start_ioeventfd(&proxy->bus); |
| } |
| |
| static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy) |
| { |
| virtio_bus_stop_ioeventfd(&proxy->bus); |
| } |
| |
| static void virtio_mmio_soft_reset(VirtIOMMIOProxy *proxy) |
| { |
| int i; |
| |
| virtio_bus_reset(&proxy->bus); |
| |
| if (!proxy->legacy) { |
| for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| proxy->vqs[i].enabled = 0; |
| } |
| } |
| } |
| |
| static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size) |
| { |
| VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque; |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| |
| trace_virtio_mmio_read(offset); |
| |
| if (!vdev) { |
| /* If no backend is present, we treat most registers as |
| * read-as-zero, except for the magic number, version and |
| * vendor ID. This is not strictly sanctioned by the virtio |
| * spec, but it allows us to provide transports with no backend |
| * plugged in which don't confuse Linux's virtio code: the |
| * probe won't complain about the bad magic number, but the |
| * device ID of zero means no backend will claim it. |
| */ |
| switch (offset) { |
| case VIRTIO_MMIO_MAGIC_VALUE: |
| return VIRT_MAGIC; |
| case VIRTIO_MMIO_VERSION: |
| if (proxy->legacy) { |
| return VIRT_VERSION_LEGACY; |
| } else { |
| return VIRT_VERSION; |
| } |
| case VIRTIO_MMIO_VENDOR_ID: |
| return VIRT_VENDOR; |
| default: |
| return 0; |
| } |
| } |
| |
| if (offset >= VIRTIO_MMIO_CONFIG) { |
| offset -= VIRTIO_MMIO_CONFIG; |
| if (proxy->legacy) { |
| switch (size) { |
| case 1: |
| return virtio_config_readb(vdev, offset); |
| case 2: |
| return virtio_config_readw(vdev, offset); |
| case 4: |
| return virtio_config_readl(vdev, offset); |
| default: |
| abort(); |
| } |
| } else { |
| switch (size) { |
| case 1: |
| return virtio_config_modern_readb(vdev, offset); |
| case 2: |
| return virtio_config_modern_readw(vdev, offset); |
| case 4: |
| return virtio_config_modern_readl(vdev, offset); |
| default: |
| abort(); |
| } |
| } |
| } |
| if (size != 4) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: wrong size access to register!\n", |
| __func__); |
| return 0; |
| } |
| switch (offset) { |
| case VIRTIO_MMIO_MAGIC_VALUE: |
| return VIRT_MAGIC; |
| case VIRTIO_MMIO_VERSION: |
| if (proxy->legacy) { |
| return VIRT_VERSION_LEGACY; |
| } else { |
| return VIRT_VERSION; |
| } |
| case VIRTIO_MMIO_DEVICE_ID: |
| return vdev->device_id; |
| case VIRTIO_MMIO_VENDOR_ID: |
| return VIRT_VENDOR; |
| case VIRTIO_MMIO_DEVICE_FEATURES: |
| if (proxy->legacy) { |
| if (proxy->host_features_sel) { |
| return 0; |
| } else { |
| return vdev->host_features; |
| } |
| } else { |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
| return (vdev->host_features & ~vdc->legacy_features) |
| >> (32 * proxy->host_features_sel); |
| } |
| case VIRTIO_MMIO_QUEUE_NUM_MAX: |
| if (!virtio_queue_get_num(vdev, vdev->queue_sel)) { |
| return 0; |
| } |
| return VIRTQUEUE_MAX_SIZE; |
| case VIRTIO_MMIO_QUEUE_PFN: |
| if (!proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: read from legacy register (0x%" |
| HWADDR_PRIx ") in non-legacy mode\n", |
| __func__, offset); |
| return 0; |
| } |
| return virtio_queue_get_addr(vdev, vdev->queue_sel) |
| >> proxy->guest_page_shift; |
| case VIRTIO_MMIO_QUEUE_READY: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: read from non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return 0; |
| } |
| return proxy->vqs[vdev->queue_sel].enabled; |
| case VIRTIO_MMIO_INTERRUPT_STATUS: |
| return qatomic_read(&vdev->isr); |
| case VIRTIO_MMIO_STATUS: |
| return vdev->status; |
| case VIRTIO_MMIO_CONFIG_GENERATION: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: read from non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return 0; |
| } |
| return vdev->generation; |
| case VIRTIO_MMIO_SHM_LEN_LOW: |
| case VIRTIO_MMIO_SHM_LEN_HIGH: |
| /* |
| * VIRTIO_MMIO_SHM_SEL is unimplemented |
| * according to the linux driver, if region length is -1 |
| * the shared memory doesn't exist |
| */ |
| return -1; |
| case VIRTIO_MMIO_DEVICE_FEATURES_SEL: |
| case VIRTIO_MMIO_DRIVER_FEATURES: |
| case VIRTIO_MMIO_DRIVER_FEATURES_SEL: |
| case VIRTIO_MMIO_GUEST_PAGE_SIZE: |
| case VIRTIO_MMIO_QUEUE_SEL: |
| case VIRTIO_MMIO_QUEUE_NUM: |
| case VIRTIO_MMIO_QUEUE_ALIGN: |
| case VIRTIO_MMIO_QUEUE_NOTIFY: |
| case VIRTIO_MMIO_INTERRUPT_ACK: |
| case VIRTIO_MMIO_QUEUE_DESC_LOW: |
| case VIRTIO_MMIO_QUEUE_DESC_HIGH: |
| case VIRTIO_MMIO_QUEUE_AVAIL_LOW: |
| case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: |
| case VIRTIO_MMIO_QUEUE_USED_LOW: |
| case VIRTIO_MMIO_QUEUE_USED_HIGH: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: read of write-only register (0x%" HWADDR_PRIx ")\n", |
| __func__, offset); |
| return 0; |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: bad register offset (0x%" HWADDR_PRIx ")\n", |
| __func__, offset); |
| return 0; |
| } |
| return 0; |
| } |
| |
| static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value, |
| unsigned size) |
| { |
| VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque; |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| |
| trace_virtio_mmio_write_offset(offset, value); |
| |
| if (!vdev) { |
| /* If no backend is present, we just make all registers |
| * write-ignored. This allows us to provide transports with |
| * no backend plugged in. |
| */ |
| return; |
| } |
| |
| if (offset >= VIRTIO_MMIO_CONFIG) { |
| offset -= VIRTIO_MMIO_CONFIG; |
| if (proxy->legacy) { |
| switch (size) { |
| case 1: |
| virtio_config_writeb(vdev, offset, value); |
| break; |
| case 2: |
| virtio_config_writew(vdev, offset, value); |
| break; |
| case 4: |
| virtio_config_writel(vdev, offset, value); |
| break; |
| default: |
| abort(); |
| } |
| return; |
| } else { |
| switch (size) { |
| case 1: |
| virtio_config_modern_writeb(vdev, offset, value); |
| break; |
| case 2: |
| virtio_config_modern_writew(vdev, offset, value); |
| break; |
| case 4: |
| virtio_config_modern_writel(vdev, offset, value); |
| break; |
| default: |
| abort(); |
| } |
| return; |
| } |
| } |
| if (size != 4) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: wrong size access to register!\n", |
| __func__); |
| return; |
| } |
| switch (offset) { |
| case VIRTIO_MMIO_DEVICE_FEATURES_SEL: |
| if (value) { |
| proxy->host_features_sel = 1; |
| } else { |
| proxy->host_features_sel = 0; |
| } |
| break; |
| case VIRTIO_MMIO_DRIVER_FEATURES: |
| if (proxy->legacy) { |
| if (proxy->guest_features_sel) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: attempt to write guest features with " |
| "guest_features_sel > 0 in legacy mode\n", |
| __func__); |
| } else { |
| virtio_set_features(vdev, value); |
| } |
| } else { |
| proxy->guest_features[proxy->guest_features_sel] = value; |
| } |
| break; |
| case VIRTIO_MMIO_DRIVER_FEATURES_SEL: |
| if (value) { |
| proxy->guest_features_sel = 1; |
| } else { |
| proxy->guest_features_sel = 0; |
| } |
| break; |
| case VIRTIO_MMIO_GUEST_PAGE_SIZE: |
| if (!proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to legacy register (0x%" |
| HWADDR_PRIx ") in non-legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->guest_page_shift = ctz32(value); |
| if (proxy->guest_page_shift > 31) { |
| proxy->guest_page_shift = 0; |
| } |
| trace_virtio_mmio_guest_page(value, proxy->guest_page_shift); |
| break; |
| case VIRTIO_MMIO_QUEUE_SEL: |
| if (value < VIRTIO_QUEUE_MAX) { |
| vdev->queue_sel = value; |
| } |
| break; |
| case VIRTIO_MMIO_QUEUE_NUM: |
| trace_virtio_mmio_queue_write(value, VIRTQUEUE_MAX_SIZE); |
| virtio_queue_set_num(vdev, vdev->queue_sel, value); |
| |
| if (proxy->legacy) { |
| virtio_queue_update_rings(vdev, vdev->queue_sel); |
| } else { |
| proxy->vqs[vdev->queue_sel].num = value; |
| } |
| break; |
| case VIRTIO_MMIO_QUEUE_ALIGN: |
| if (!proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to legacy register (0x%" |
| HWADDR_PRIx ") in non-legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| virtio_queue_set_align(vdev, vdev->queue_sel, value); |
| break; |
| case VIRTIO_MMIO_QUEUE_PFN: |
| if (!proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to legacy register (0x%" |
| HWADDR_PRIx ") in non-legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| if (value == 0) { |
| virtio_mmio_soft_reset(proxy); |
| } else { |
| virtio_queue_set_addr(vdev, vdev->queue_sel, |
| value << proxy->guest_page_shift); |
| } |
| break; |
| case VIRTIO_MMIO_QUEUE_READY: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| if (value) { |
| virtio_queue_set_num(vdev, vdev->queue_sel, |
| proxy->vqs[vdev->queue_sel].num); |
| virtio_queue_set_rings(vdev, vdev->queue_sel, |
| ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | |
| proxy->vqs[vdev->queue_sel].desc[0], |
| ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | |
| proxy->vqs[vdev->queue_sel].avail[0], |
| ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | |
| proxy->vqs[vdev->queue_sel].used[0]); |
| proxy->vqs[vdev->queue_sel].enabled = 1; |
| } else { |
| proxy->vqs[vdev->queue_sel].enabled = 0; |
| } |
| break; |
| case VIRTIO_MMIO_QUEUE_NOTIFY: |
| if (value < VIRTIO_QUEUE_MAX) { |
| virtio_queue_notify(vdev, value); |
| } |
| break; |
| case VIRTIO_MMIO_INTERRUPT_ACK: |
| qatomic_and(&vdev->isr, ~value); |
| virtio_update_irq(vdev); |
| break; |
| case VIRTIO_MMIO_STATUS: |
| if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| virtio_mmio_stop_ioeventfd(proxy); |
| } |
| |
| if (!proxy->legacy && (value & VIRTIO_CONFIG_S_FEATURES_OK)) { |
| virtio_set_features(vdev, |
| ((uint64_t)proxy->guest_features[1]) << 32 | |
| proxy->guest_features[0]); |
| } |
| |
| virtio_set_status(vdev, value & 0xff); |
| |
| if (value & VIRTIO_CONFIG_S_DRIVER_OK) { |
| virtio_mmio_start_ioeventfd(proxy); |
| } |
| |
| if (vdev->status == 0) { |
| virtio_mmio_soft_reset(proxy); |
| } |
| break; |
| case VIRTIO_MMIO_QUEUE_DESC_LOW: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->vqs[vdev->queue_sel].desc[0] = value; |
| break; |
| case VIRTIO_MMIO_QUEUE_DESC_HIGH: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->vqs[vdev->queue_sel].desc[1] = value; |
| break; |
| case VIRTIO_MMIO_QUEUE_AVAIL_LOW: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->vqs[vdev->queue_sel].avail[0] = value; |
| break; |
| case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->vqs[vdev->queue_sel].avail[1] = value; |
| break; |
| case VIRTIO_MMIO_QUEUE_USED_LOW: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->vqs[vdev->queue_sel].used[0] = value; |
| break; |
| case VIRTIO_MMIO_QUEUE_USED_HIGH: |
| if (proxy->legacy) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to non-legacy register (0x%" |
| HWADDR_PRIx ") in legacy mode\n", |
| __func__, offset); |
| return; |
| } |
| proxy->vqs[vdev->queue_sel].used[1] = value; |
| break; |
| case VIRTIO_MMIO_MAGIC_VALUE: |
| case VIRTIO_MMIO_VERSION: |
| case VIRTIO_MMIO_DEVICE_ID: |
| case VIRTIO_MMIO_VENDOR_ID: |
| case VIRTIO_MMIO_DEVICE_FEATURES: |
| case VIRTIO_MMIO_QUEUE_NUM_MAX: |
| case VIRTIO_MMIO_INTERRUPT_STATUS: |
| case VIRTIO_MMIO_CONFIG_GENERATION: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: write to read-only register (0x%" HWADDR_PRIx ")\n", |
| __func__, offset); |
| break; |
| |
| default: |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "%s: bad register offset (0x%" HWADDR_PRIx ")\n", |
| __func__, offset); |
| } |
| } |
| |
| static const MemoryRegionOps virtio_legacy_mem_ops = { |
| .read = virtio_mmio_read, |
| .write = virtio_mmio_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| }; |
| |
| static const MemoryRegionOps virtio_mem_ops = { |
| .read = virtio_mmio_read, |
| .write = virtio_mmio_write, |
| .endianness = DEVICE_LITTLE_ENDIAN, |
| }; |
| |
| static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| int level; |
| |
| if (!vdev) { |
| return; |
| } |
| level = (qatomic_read(&vdev->isr) != 0); |
| trace_virtio_mmio_setting_irq(level); |
| qemu_set_irq(proxy->irq, level); |
| } |
| |
| static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| |
| proxy->host_features_sel = qemu_get_be32(f); |
| proxy->guest_features_sel = qemu_get_be32(f); |
| proxy->guest_page_shift = qemu_get_be32(f); |
| return 0; |
| } |
| |
| static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| |
| qemu_put_be32(f, proxy->host_features_sel); |
| qemu_put_be32(f, proxy->guest_features_sel); |
| qemu_put_be32(f, proxy->guest_page_shift); |
| } |
| |
| static const VMStateDescription vmstate_virtio_mmio_queue_state = { |
| .name = "virtio_mmio/queue_state", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT16(num, VirtIOMMIOQueue), |
| VMSTATE_BOOL(enabled, VirtIOMMIOQueue), |
| VMSTATE_UINT32_ARRAY(desc, VirtIOMMIOQueue, 2), |
| VMSTATE_UINT32_ARRAY(avail, VirtIOMMIOQueue, 2), |
| VMSTATE_UINT32_ARRAY(used, VirtIOMMIOQueue, 2), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const VMStateDescription vmstate_virtio_mmio_state_sub = { |
| .name = "virtio_mmio/state", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32_ARRAY(guest_features, VirtIOMMIOProxy, 2), |
| VMSTATE_STRUCT_ARRAY(vqs, VirtIOMMIOProxy, VIRTIO_QUEUE_MAX, 0, |
| vmstate_virtio_mmio_queue_state, |
| VirtIOMMIOQueue), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const VMStateDescription vmstate_virtio_mmio = { |
| .name = "virtio_mmio", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_END_OF_LIST() |
| }, |
| .subsections = (const VMStateDescription * []) { |
| &vmstate_virtio_mmio_state_sub, |
| NULL |
| } |
| }; |
| |
| static void virtio_mmio_save_extra_state(DeviceState *opaque, QEMUFile *f) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| |
| vmstate_save_state(f, &vmstate_virtio_mmio, proxy, NULL); |
| } |
| |
| static int virtio_mmio_load_extra_state(DeviceState *opaque, QEMUFile *f) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| |
| return vmstate_load_state(f, &vmstate_virtio_mmio, proxy, 1); |
| } |
| |
| static bool virtio_mmio_has_extra_state(DeviceState *opaque) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| |
| return !proxy->legacy; |
| } |
| |
| static void virtio_mmio_reset(DeviceState *d) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| int i; |
| |
| virtio_mmio_soft_reset(proxy); |
| |
| proxy->host_features_sel = 0; |
| proxy->guest_features_sel = 0; |
| proxy->guest_page_shift = 0; |
| |
| if (!proxy->legacy) { |
| proxy->guest_features[0] = proxy->guest_features[1] = 0; |
| |
| for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| proxy->vqs[i].num = 0; |
| proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; |
| proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; |
| proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; |
| } |
| } |
| } |
| |
| static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign, |
| bool with_irqfd) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
| VirtQueue *vq = virtio_get_queue(vdev, n); |
| EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
| |
| if (assign) { |
| int r = event_notifier_init(notifier, 0); |
| if (r < 0) { |
| return r; |
| } |
| virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); |
| } else { |
| virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); |
| event_notifier_cleanup(notifier); |
| } |
| |
| if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { |
| vdc->guest_notifier_mask(vdev, n, !assign); |
| } |
| |
| return 0; |
| } |
| static int virtio_mmio_set_config_guest_notifier(DeviceState *d, bool assign, |
| bool with_irqfd) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
| EventNotifier *notifier = virtio_config_get_guest_notifier(vdev); |
| int r = 0; |
| |
| if (assign) { |
| r = event_notifier_init(notifier, 0); |
| if (r < 0) { |
| return r; |
| } |
| virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd); |
| } else { |
| virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd); |
| event_notifier_cleanup(notifier); |
| } |
| if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { |
| vdc->guest_notifier_mask(vdev, VIRTIO_CONFIG_IRQ_IDX, !assign); |
| } |
| return r; |
| } |
| static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs, |
| bool assign) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| /* TODO: need to check if kvm-arm supports irqfd */ |
| bool with_irqfd = false; |
| int r, n; |
| |
| nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); |
| |
| for (n = 0; n < nvqs; n++) { |
| if (!virtio_queue_get_num(vdev, n)) { |
| break; |
| } |
| |
| r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd); |
| if (r < 0) { |
| goto assign_error; |
| } |
| } |
| r = virtio_mmio_set_config_guest_notifier(d, assign, with_irqfd); |
| if (r < 0) { |
| goto assign_error; |
| } |
| |
| return 0; |
| |
| assign_error: |
| /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ |
| assert(assign); |
| while (--n >= 0) { |
| virtio_mmio_set_guest_notifier(d, n, !assign, false); |
| } |
| return r; |
| } |
| |
| static void virtio_mmio_pre_plugged(DeviceState *d, Error **errp) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| |
| if (!proxy->legacy) { |
| virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); |
| } |
| } |
| |
| /* virtio-mmio device */ |
| |
| static Property virtio_mmio_properties[] = { |
| DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy, |
| format_transport_address, true), |
| DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true), |
| DEFINE_PROP_BIT("ioeventfd", VirtIOMMIOProxy, flags, |
| VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT, true), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void virtio_mmio_realizefn(DeviceState *d, Error **errp) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| SysBusDevice *sbd = SYS_BUS_DEVICE(d); |
| |
| qbus_init(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS, d, NULL); |
| sysbus_init_irq(sbd, &proxy->irq); |
| |
| if (!kvm_eventfds_enabled()) { |
| proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; |
| } |
| |
| /* fd-based ioevents can't be synchronized in record/replay */ |
| if (replay_mode != REPLAY_MODE_NONE) { |
| proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; |
| } |
| |
| if (proxy->legacy) { |
| memory_region_init_io(&proxy->iomem, OBJECT(d), |
| &virtio_legacy_mem_ops, proxy, |
| TYPE_VIRTIO_MMIO, 0x200); |
| } else { |
| memory_region_init_io(&proxy->iomem, OBJECT(d), |
| &virtio_mem_ops, proxy, |
| TYPE_VIRTIO_MMIO, 0x200); |
| } |
| sysbus_init_mmio(sbd, &proxy->iomem); |
| } |
| |
| static void virtio_mmio_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| dc->realize = virtio_mmio_realizefn; |
| dc->reset = virtio_mmio_reset; |
| set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| device_class_set_props(dc, virtio_mmio_properties); |
| } |
| |
| static const TypeInfo virtio_mmio_info = { |
| .name = TYPE_VIRTIO_MMIO, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(VirtIOMMIOProxy), |
| .class_init = virtio_mmio_class_init, |
| }; |
| |
| /* virtio-mmio-bus. */ |
| |
| static char *virtio_mmio_bus_get_dev_path(DeviceState *dev) |
| { |
| BusState *virtio_mmio_bus; |
| VirtIOMMIOProxy *virtio_mmio_proxy; |
| char *proxy_path; |
| char *path; |
| MemoryRegionSection section; |
| |
| virtio_mmio_bus = qdev_get_parent_bus(dev); |
| virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent); |
| proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy)); |
| |
| /* |
| * If @format_transport_address is false, then we just perform the same as |
| * virtio_bus_get_dev_path(): we delegate the address formatting for the |
| * device on the virtio-mmio bus to the bus that the virtio-mmio proxy |
| * (i.e., the device that implements the virtio-mmio bus) resides on. In |
| * this case the base address of the virtio-mmio transport will be |
| * invisible. |
| */ |
| if (!virtio_mmio_proxy->format_transport_address) { |
| return proxy_path; |
| } |
| |
| /* Otherwise, we append the base address of the transport. */ |
| section = memory_region_find(&virtio_mmio_proxy->iomem, 0, 0x200); |
| assert(section.mr); |
| |
| if (proxy_path) { |
| path = g_strdup_printf("%s/virtio-mmio@" HWADDR_FMT_plx, proxy_path, |
| section.offset_within_address_space); |
| } else { |
| path = g_strdup_printf("virtio-mmio@" HWADDR_FMT_plx, |
| section.offset_within_address_space); |
| } |
| memory_region_unref(section.mr); |
| |
| g_free(proxy_path); |
| return path; |
| } |
| |
| static void virtio_mmio_vmstate_change(DeviceState *d, bool running) |
| { |
| VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| |
| if (running) { |
| virtio_mmio_start_ioeventfd(proxy); |
| } else { |
| virtio_mmio_stop_ioeventfd(proxy); |
| } |
| } |
| |
| static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data) |
| { |
| BusClass *bus_class = BUS_CLASS(klass); |
| VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); |
| |
| k->notify = virtio_mmio_update_irq; |
| k->save_config = virtio_mmio_save_config; |
| k->load_config = virtio_mmio_load_config; |
| k->save_extra_state = virtio_mmio_save_extra_state; |
| k->load_extra_state = virtio_mmio_load_extra_state; |
| k->has_extra_state = virtio_mmio_has_extra_state; |
| k->set_guest_notifiers = virtio_mmio_set_guest_notifiers; |
| k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled; |
| k->ioeventfd_assign = virtio_mmio_ioeventfd_assign; |
| k->pre_plugged = virtio_mmio_pre_plugged; |
| k->vmstate_change = virtio_mmio_vmstate_change; |
| k->has_variable_vring_alignment = true; |
| bus_class->max_dev = 1; |
| bus_class->get_dev_path = virtio_mmio_bus_get_dev_path; |
| } |
| |
| static const TypeInfo virtio_mmio_bus_info = { |
| .name = TYPE_VIRTIO_MMIO_BUS, |
| .parent = TYPE_VIRTIO_BUS, |
| .instance_size = sizeof(VirtioBusState), |
| .class_init = virtio_mmio_bus_class_init, |
| }; |
| |
| static void virtio_mmio_register_types(void) |
| { |
| type_register_static(&virtio_mmio_bus_info); |
| type_register_static(&virtio_mmio_info); |
| } |
| |
| type_init(virtio_mmio_register_types) |
