| /* |
| * virtio ccw target implementation |
| * |
| * Copyright 2012,2015 IBM Corp. |
| * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
| * Pierre Morel <pmorel@linux.vnet.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or (at |
| * your option) any later version. See the COPYING file in the top-level |
| * directory. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "exec/address-spaces.h" |
| #include "sysemu/kvm.h" |
| #include "net/net.h" |
| #include "hw/virtio/virtio.h" |
| #include "migration/qemu-file-types.h" |
| #include "hw/virtio/virtio-net.h" |
| #include "qemu/bitops.h" |
| #include "qemu/error-report.h" |
| #include "qemu/log.h" |
| #include "qemu/module.h" |
| #include "hw/virtio/virtio-access.h" |
| #include "hw/virtio/virtio-bus.h" |
| #include "hw/s390x/adapter.h" |
| #include "hw/s390x/s390_flic.h" |
| |
| #include "hw/s390x/ioinst.h" |
| #include "hw/s390x/css.h" |
| #include "virtio-ccw.h" |
| #include "trace.h" |
| #include "hw/s390x/css-bridge.h" |
| #include "hw/s390x/s390-virtio-ccw.h" |
| #include "sysemu/replay.h" |
| |
| #define NR_CLASSIC_INDICATOR_BITS 64 |
| |
| bool have_virtio_ccw = true; |
| |
| static int virtio_ccw_dev_post_load(void *opaque, int version_id) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); |
| CcwDevice *ccw_dev = CCW_DEVICE(dev); |
| CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); |
| |
| ccw_dev->sch->driver_data = dev; |
| if (ccw_dev->sch->thinint_active) { |
| dev->routes.adapter.adapter_id = css_get_adapter_id( |
| CSS_IO_ADAPTER_VIRTIO, |
| dev->thinint_isc); |
| } |
| /* Re-fill subch_id after loading the subchannel states.*/ |
| if (ck->refill_ids) { |
| ck->refill_ids(ccw_dev); |
| } |
| return 0; |
| } |
| |
| typedef struct VirtioCcwDeviceTmp { |
| VirtioCcwDevice *parent; |
| uint16_t config_vector; |
| } VirtioCcwDeviceTmp; |
| |
| static int virtio_ccw_dev_tmp_pre_save(void *opaque) |
| { |
| VirtioCcwDeviceTmp *tmp = opaque; |
| VirtioCcwDevice *dev = tmp->parent; |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| |
| tmp->config_vector = vdev->config_vector; |
| |
| return 0; |
| } |
| |
| static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) |
| { |
| VirtioCcwDeviceTmp *tmp = opaque; |
| VirtioCcwDevice *dev = tmp->parent; |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| |
| vdev->config_vector = tmp->config_vector; |
| return 0; |
| } |
| |
| const VMStateDescription vmstate_virtio_ccw_dev_tmp = { |
| .name = "s390_virtio_ccw_dev_tmp", |
| .pre_save = virtio_ccw_dev_tmp_pre_save, |
| .post_load = virtio_ccw_dev_tmp_post_load, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| const VMStateDescription vmstate_virtio_ccw_dev = { |
| .name = "s390_virtio_ccw_dev", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .post_load = virtio_ccw_dev_post_load, |
| .fields = (VMStateField[]) { |
| VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), |
| VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), |
| VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), |
| VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), |
| /* |
| * Ugly hack because VirtIODevice does not migrate itself. |
| * This also makes legacy via vmstate_save_state possible. |
| */ |
| VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, |
| vmstate_virtio_ccw_dev_tmp), |
| VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, |
| AdapterRoutes), |
| VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), |
| VMSTATE_INT32(revision, VirtioCcwDevice), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, |
| VirtioCcwDevice *dev); |
| |
| VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) |
| { |
| VirtIODevice *vdev = NULL; |
| VirtioCcwDevice *dev = sch->driver_data; |
| |
| if (dev) { |
| vdev = virtio_bus_get_device(&dev->bus); |
| } |
| return vdev; |
| } |
| |
| static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) |
| { |
| virtio_bus_start_ioeventfd(&dev->bus); |
| } |
| |
| static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) |
| { |
| virtio_bus_stop_ioeventfd(&dev->bus); |
| } |
| |
| static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| |
| return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; |
| } |
| |
| static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, |
| int n, bool assign) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| CcwDevice *ccw_dev = CCW_DEVICE(dev); |
| SubchDev *sch = ccw_dev->sch; |
| uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; |
| |
| return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); |
| } |
| |
| /* Communication blocks used by several channel commands. */ |
| typedef struct VqInfoBlockLegacy { |
| uint64_t queue; |
| uint32_t align; |
| uint16_t index; |
| uint16_t num; |
| } QEMU_PACKED VqInfoBlockLegacy; |
| |
| typedef struct VqInfoBlock { |
| uint64_t desc; |
| uint32_t res0; |
| uint16_t index; |
| uint16_t num; |
| uint64_t avail; |
| uint64_t used; |
| } QEMU_PACKED VqInfoBlock; |
| |
| typedef struct VqConfigBlock { |
| uint16_t index; |
| uint16_t num_max; |
| } QEMU_PACKED VqConfigBlock; |
| |
| typedef struct VirtioFeatDesc { |
| uint32_t features; |
| uint8_t index; |
| } QEMU_PACKED VirtioFeatDesc; |
| |
| typedef struct VirtioThinintInfo { |
| hwaddr summary_indicator; |
| hwaddr device_indicator; |
| uint64_t ind_bit; |
| uint8_t isc; |
| } QEMU_PACKED VirtioThinintInfo; |
| |
| typedef struct VirtioRevInfo { |
| uint16_t revision; |
| uint16_t length; |
| uint8_t data[]; |
| } QEMU_PACKED VirtioRevInfo; |
| |
| /* Specify where the virtqueues for the subchannel are in guest memory. */ |
| static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, |
| VqInfoBlockLegacy *linfo) |
| { |
| VirtIODevice *vdev = virtio_ccw_get_vdev(sch); |
| uint16_t index = info ? info->index : linfo->index; |
| uint16_t num = info ? info->num : linfo->num; |
| uint64_t desc = info ? info->desc : linfo->queue; |
| |
| if (index >= VIRTIO_QUEUE_MAX) { |
| return -EINVAL; |
| } |
| |
| /* Current code in virtio.c relies on 4K alignment. */ |
| if (linfo && desc && (linfo->align != 4096)) { |
| return -EINVAL; |
| } |
| |
| if (!vdev) { |
| return -EINVAL; |
| } |
| |
| if (info) { |
| virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); |
| } else { |
| virtio_queue_set_addr(vdev, index, desc); |
| } |
| if (!desc) { |
| virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); |
| } else { |
| if (info) { |
| /* virtio-1 allows changing the ring size. */ |
| if (virtio_queue_get_max_num(vdev, index) < num) { |
| /* Fail if we exceed the maximum number. */ |
| return -EINVAL; |
| } |
| virtio_queue_set_num(vdev, index, num); |
| virtio_init_region_cache(vdev, index); |
| } else if (virtio_queue_get_num(vdev, index) > num) { |
| /* Fail if we don't have a big enough queue. */ |
| return -EINVAL; |
| } |
| /* We ignore possible increased num for legacy for compatibility. */ |
| virtio_queue_set_vector(vdev, index, index); |
| } |
| /* tell notify handler in case of config change */ |
| vdev->config_vector = VIRTIO_QUEUE_MAX; |
| return 0; |
| } |
| |
| static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev) |
| { |
| CcwDevice *ccw_dev = CCW_DEVICE(dev); |
| |
| virtio_bus_reset(&dev->bus); |
| if (dev->indicators) { |
| release_indicator(&dev->routes.adapter, dev->indicators); |
| dev->indicators = NULL; |
| } |
| if (dev->indicators2) { |
| release_indicator(&dev->routes.adapter, dev->indicators2); |
| dev->indicators2 = NULL; |
| } |
| if (dev->summary_indicator) { |
| release_indicator(&dev->routes.adapter, dev->summary_indicator); |
| dev->summary_indicator = NULL; |
| } |
| ccw_dev->sch->thinint_active = false; |
| } |
| |
| static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, |
| bool is_legacy) |
| { |
| int ret; |
| VqInfoBlock info; |
| VqInfoBlockLegacy linfo; |
| size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); |
| |
| if (check_len) { |
| if (ccw.count != info_len) { |
| return -EINVAL; |
| } |
| } else if (ccw.count < info_len) { |
| /* Can't execute command. */ |
| return -EINVAL; |
| } |
| if (!ccw.cda) { |
| return -EFAULT; |
| } |
| if (is_legacy) { |
| ret = ccw_dstream_read(&sch->cds, linfo); |
| if (ret) { |
| return ret; |
| } |
| linfo.queue = be64_to_cpu(linfo.queue); |
| linfo.align = be32_to_cpu(linfo.align); |
| linfo.index = be16_to_cpu(linfo.index); |
| linfo.num = be16_to_cpu(linfo.num); |
| ret = virtio_ccw_set_vqs(sch, NULL, &linfo); |
| } else { |
| ret = ccw_dstream_read(&sch->cds, info); |
| if (ret) { |
| return ret; |
| } |
| info.desc = be64_to_cpu(info.desc); |
| info.index = be16_to_cpu(info.index); |
| info.num = be16_to_cpu(info.num); |
| info.avail = be64_to_cpu(info.avail); |
| info.used = be64_to_cpu(info.used); |
| ret = virtio_ccw_set_vqs(sch, &info, NULL); |
| } |
| sch->curr_status.scsw.count = 0; |
| return ret; |
| } |
| |
| static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) |
| { |
| int ret; |
| VirtioRevInfo revinfo; |
| uint8_t status; |
| VirtioFeatDesc features; |
| hwaddr indicators; |
| VqConfigBlock vq_config; |
| VirtioCcwDevice *dev = sch->driver_data; |
| VirtIODevice *vdev = virtio_ccw_get_vdev(sch); |
| bool check_len; |
| int len; |
| VirtioThinintInfo thinint; |
| |
| if (!dev) { |
| return -EINVAL; |
| } |
| |
| trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, |
| ccw.cmd_code); |
| check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); |
| |
| if (dev->revision < 0 && ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { |
| if (dev->force_revision_1) { |
| /* |
| * virtio-1 drivers must start with negotiating to a revision >= 1, |
| * so post a command reject for all other commands |
| */ |
| return -ENOSYS; |
| } else { |
| /* |
| * If the driver issues any command that is not SET_VIRTIO_REV, |
| * we'll have to operate the device in legacy mode. |
| */ |
| dev->revision = 0; |
| } |
| } |
| |
| /* Look at the command. */ |
| switch (ccw.cmd_code) { |
| case CCW_CMD_SET_VQ: |
| ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); |
| break; |
| case CCW_CMD_VDEV_RESET: |
| virtio_ccw_reset_virtio(dev); |
| ret = 0; |
| break; |
| case CCW_CMD_READ_FEAT: |
| if (check_len) { |
| if (ccw.count != sizeof(features)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(features)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
| |
| ccw_dstream_advance(&sch->cds, sizeof(features.features)); |
| ret = ccw_dstream_read(&sch->cds, features.index); |
| if (ret) { |
| break; |
| } |
| if (features.index == 0) { |
| if (dev->revision >= 1) { |
| /* Don't offer legacy features for modern devices. */ |
| features.features = (uint32_t) |
| (vdev->host_features & ~vdc->legacy_features); |
| } else { |
| features.features = (uint32_t)vdev->host_features; |
| } |
| } else if ((features.index == 1) && (dev->revision >= 1)) { |
| /* |
| * Only offer feature bits beyond 31 if the guest has |
| * negotiated at least revision 1. |
| */ |
| features.features = (uint32_t)(vdev->host_features >> 32); |
| } else { |
| /* Return zeroes if the guest supports more feature bits. */ |
| features.features = 0; |
| } |
| ccw_dstream_rewind(&sch->cds); |
| features.features = cpu_to_le32(features.features); |
| ret = ccw_dstream_write(&sch->cds, features.features); |
| if (!ret) { |
| sch->curr_status.scsw.count = ccw.count - sizeof(features); |
| } |
| } |
| break; |
| case CCW_CMD_WRITE_FEAT: |
| if (check_len) { |
| if (ccw.count != sizeof(features)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(features)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| ret = ccw_dstream_read(&sch->cds, features); |
| if (ret) { |
| break; |
| } |
| features.features = le32_to_cpu(features.features); |
| if (features.index == 0) { |
| virtio_set_features(vdev, |
| (vdev->guest_features & 0xffffffff00000000ULL) | |
| features.features); |
| } else if ((features.index == 1) && (dev->revision >= 1)) { |
| /* |
| * If the guest did not negotiate at least revision 1, |
| * we did not offer it any feature bits beyond 31. Such a |
| * guest passing us any bit here is therefore buggy. |
| */ |
| virtio_set_features(vdev, |
| (vdev->guest_features & 0x00000000ffffffffULL) | |
| ((uint64_t)features.features << 32)); |
| } else { |
| /* |
| * If the guest supports more feature bits, assert that it |
| * passes us zeroes for those we don't support. |
| */ |
| if (features.features) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "Guest bug: features[%i]=%x (expected 0)", |
| features.index, features.features); |
| /* XXX: do a unit check here? */ |
| } |
| } |
| sch->curr_status.scsw.count = ccw.count - sizeof(features); |
| ret = 0; |
| } |
| break; |
| case CCW_CMD_READ_CONF: |
| if (check_len) { |
| if (ccw.count > vdev->config_len) { |
| ret = -EINVAL; |
| break; |
| } |
| } |
| len = MIN(ccw.count, vdev->config_len); |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| virtio_bus_get_vdev_config(&dev->bus, vdev->config); |
| ret = ccw_dstream_write_buf(&sch->cds, vdev->config, len); |
| if (ret) { |
| sch->curr_status.scsw.count = ccw.count - len; |
| } |
| } |
| break; |
| case CCW_CMD_WRITE_CONF: |
| if (check_len) { |
| if (ccw.count > vdev->config_len) { |
| ret = -EINVAL; |
| break; |
| } |
| } |
| len = MIN(ccw.count, vdev->config_len); |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); |
| if (!ret) { |
| virtio_bus_set_vdev_config(&dev->bus, vdev->config); |
| sch->curr_status.scsw.count = ccw.count - len; |
| } |
| } |
| break; |
| case CCW_CMD_READ_STATUS: |
| if (check_len) { |
| if (ccw.count != sizeof(status)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(status)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| address_space_stb(&address_space_memory, ccw.cda, vdev->status, |
| MEMTXATTRS_UNSPECIFIED, NULL); |
| sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); |
| ret = 0; |
| } |
| break; |
| case CCW_CMD_WRITE_STATUS: |
| if (check_len) { |
| if (ccw.count != sizeof(status)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(status)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| ret = ccw_dstream_read(&sch->cds, status); |
| if (ret) { |
| break; |
| } |
| if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| virtio_ccw_stop_ioeventfd(dev); |
| } |
| if (virtio_set_status(vdev, status) == 0) { |
| if (vdev->status == 0) { |
| virtio_ccw_reset_virtio(dev); |
| } |
| if (status & VIRTIO_CONFIG_S_DRIVER_OK) { |
| virtio_ccw_start_ioeventfd(dev); |
| } |
| sch->curr_status.scsw.count = ccw.count - sizeof(status); |
| ret = 0; |
| } else { |
| /* Trigger a command reject. */ |
| ret = -ENOSYS; |
| } |
| } |
| break; |
| case CCW_CMD_SET_IND: |
| if (check_len) { |
| if (ccw.count != sizeof(indicators)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(indicators)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (sch->thinint_active) { |
| /* Trigger a command reject. */ |
| ret = -ENOSYS; |
| break; |
| } |
| if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { |
| /* More queues than indicator bits --> trigger a reject */ |
| ret = -ENOSYS; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| ret = ccw_dstream_read(&sch->cds, indicators); |
| if (ret) { |
| break; |
| } |
| indicators = be64_to_cpu(indicators); |
| dev->indicators = get_indicator(indicators, sizeof(uint64_t)); |
| sch->curr_status.scsw.count = ccw.count - sizeof(indicators); |
| ret = 0; |
| } |
| break; |
| case CCW_CMD_SET_CONF_IND: |
| if (check_len) { |
| if (ccw.count != sizeof(indicators)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(indicators)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| ret = ccw_dstream_read(&sch->cds, indicators); |
| if (ret) { |
| break; |
| } |
| indicators = be64_to_cpu(indicators); |
| dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); |
| sch->curr_status.scsw.count = ccw.count - sizeof(indicators); |
| ret = 0; |
| } |
| break; |
| case CCW_CMD_READ_VQ_CONF: |
| if (check_len) { |
| if (ccw.count != sizeof(vq_config)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(vq_config)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else { |
| ret = ccw_dstream_read(&sch->cds, vq_config.index); |
| if (ret) { |
| break; |
| } |
| vq_config.index = be16_to_cpu(vq_config.index); |
| if (vq_config.index >= VIRTIO_QUEUE_MAX) { |
| ret = -EINVAL; |
| break; |
| } |
| vq_config.num_max = virtio_queue_get_num(vdev, |
| vq_config.index); |
| vq_config.num_max = cpu_to_be16(vq_config.num_max); |
| ret = ccw_dstream_write(&sch->cds, vq_config.num_max); |
| if (!ret) { |
| sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); |
| } |
| } |
| break; |
| case CCW_CMD_SET_IND_ADAPTER: |
| if (check_len) { |
| if (ccw.count != sizeof(thinint)) { |
| ret = -EINVAL; |
| break; |
| } |
| } else if (ccw.count < sizeof(thinint)) { |
| /* Can't execute command. */ |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| } else if (dev->indicators && !sch->thinint_active) { |
| /* Trigger a command reject. */ |
| ret = -ENOSYS; |
| } else { |
| if (ccw_dstream_read(&sch->cds, thinint)) { |
| ret = -EFAULT; |
| } else { |
| thinint.ind_bit = be64_to_cpu(thinint.ind_bit); |
| thinint.summary_indicator = |
| be64_to_cpu(thinint.summary_indicator); |
| thinint.device_indicator = |
| be64_to_cpu(thinint.device_indicator); |
| |
| dev->summary_indicator = |
| get_indicator(thinint.summary_indicator, sizeof(uint8_t)); |
| dev->indicators = |
| get_indicator(thinint.device_indicator, |
| thinint.ind_bit / 8 + 1); |
| dev->thinint_isc = thinint.isc; |
| dev->routes.adapter.ind_offset = thinint.ind_bit; |
| dev->routes.adapter.summary_offset = 7; |
| dev->routes.adapter.adapter_id = css_get_adapter_id( |
| CSS_IO_ADAPTER_VIRTIO, |
| dev->thinint_isc); |
| sch->thinint_active = ((dev->indicators != NULL) && |
| (dev->summary_indicator != NULL)); |
| sch->curr_status.scsw.count = ccw.count - sizeof(thinint); |
| ret = 0; |
| } |
| } |
| break; |
| case CCW_CMD_SET_VIRTIO_REV: |
| len = sizeof(revinfo); |
| if (ccw.count < len) { |
| ret = -EINVAL; |
| break; |
| } |
| if (!ccw.cda) { |
| ret = -EFAULT; |
| break; |
| } |
| ret = ccw_dstream_read_buf(&sch->cds, &revinfo, 4); |
| if (ret < 0) { |
| break; |
| } |
| revinfo.revision = be16_to_cpu(revinfo.revision); |
| revinfo.length = be16_to_cpu(revinfo.length); |
| if (ccw.count < len + revinfo.length || |
| (check_len && ccw.count > len + revinfo.length)) { |
| ret = -EINVAL; |
| break; |
| } |
| /* |
| * Once we start to support revisions with additional data, we'll |
| * need to fetch it here. Nothing to do for now, though. |
| */ |
| if (dev->revision >= 0 || |
| revinfo.revision > virtio_ccw_rev_max(dev) || |
| (dev->force_revision_1 && !revinfo.revision)) { |
| ret = -ENOSYS; |
| break; |
| } |
| ret = 0; |
| dev->revision = revinfo.revision; |
| break; |
| default: |
| ret = -ENOSYS; |
| break; |
| } |
| return ret; |
| } |
| |
| static void virtio_sch_disable_cb(SubchDev *sch) |
| { |
| VirtioCcwDevice *dev = sch->driver_data; |
| |
| dev->revision = -1; |
| } |
| |
| static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) |
| { |
| VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); |
| CcwDevice *ccw_dev = CCW_DEVICE(dev); |
| CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); |
| SubchDev *sch; |
| Error *err = NULL; |
| int i; |
| |
| sch = css_create_sch(ccw_dev->devno, errp); |
| if (!sch) { |
| return; |
| } |
| if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { |
| error_setg(&err, "Invalid value of property max_rev " |
| "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); |
| goto out_err; |
| } |
| |
| sch->driver_data = dev; |
| sch->ccw_cb = virtio_ccw_cb; |
| sch->disable_cb = virtio_sch_disable_cb; |
| sch->id.reserved = 0xff; |
| sch->id.cu_type = VIRTIO_CCW_CU_TYPE; |
| sch->do_subchannel_work = do_subchannel_work_virtual; |
| sch->irb_cb = build_irb_virtual; |
| ccw_dev->sch = sch; |
| dev->indicators = NULL; |
| dev->revision = -1; |
| for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { |
| dev->routes.gsi[i] = -1; |
| } |
| css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); |
| |
| trace_virtio_ccw_new_device( |
| sch->cssid, sch->ssid, sch->schid, sch->devno, |
| ccw_dev->devno.valid ? "user-configured" : "auto-configured"); |
| |
| if (kvm_enabled() && !kvm_eventfds_enabled()) { |
| dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; |
| } |
| |
| /* fd-based ioevents can't be synchronized in record/replay */ |
| if (replay_mode != REPLAY_MODE_NONE) { |
| dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; |
| } |
| |
| if (k->realize) { |
| k->realize(dev, &err); |
| if (err) { |
| goto out_err; |
| } |
| } |
| |
| ck->realize(ccw_dev, &err); |
| if (err) { |
| goto out_err; |
| } |
| |
| return; |
| |
| out_err: |
| error_propagate(errp, err); |
| css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); |
| ccw_dev->sch = NULL; |
| g_free(sch); |
| } |
| |
| static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev) |
| { |
| VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); |
| CcwDevice *ccw_dev = CCW_DEVICE(dev); |
| SubchDev *sch = ccw_dev->sch; |
| |
| if (dc->unrealize) { |
| dc->unrealize(dev); |
| } |
| |
| if (sch) { |
| css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); |
| g_free(sch); |
| ccw_dev->sch = NULL; |
| } |
| if (dev->indicators) { |
| release_indicator(&dev->routes.adapter, dev->indicators); |
| dev->indicators = NULL; |
| } |
| } |
| |
| /* DeviceState to VirtioCcwDevice. Note: used on datapath, |
| * be careful and test performance if you change this. |
| */ |
| static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) |
| { |
| CcwDevice *ccw_dev = to_ccw_dev_fast(d); |
| |
| return container_of(ccw_dev, VirtioCcwDevice, parent_obj); |
| } |
| |
| static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, |
| uint8_t to_be_set) |
| { |
| uint8_t expected, actual; |
| hwaddr len = 1; |
| /* avoid multiple fetches */ |
| uint8_t volatile *ind_addr; |
| |
| ind_addr = cpu_physical_memory_map(ind_loc, &len, true); |
| if (!ind_addr) { |
| error_report("%s(%x.%x.%04x): unable to access indicator", |
| __func__, sch->cssid, sch->ssid, sch->schid); |
| return -1; |
| } |
| actual = *ind_addr; |
| do { |
| expected = actual; |
| actual = qatomic_cmpxchg(ind_addr, expected, expected | to_be_set); |
| } while (actual != expected); |
| trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set); |
| cpu_physical_memory_unmap((void *)ind_addr, len, 1, len); |
| |
| return actual; |
| } |
| |
| static void virtio_ccw_notify(DeviceState *d, uint16_t vector) |
| { |
| VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); |
| CcwDevice *ccw_dev = to_ccw_dev_fast(d); |
| SubchDev *sch = ccw_dev->sch; |
| uint64_t indicators; |
| |
| if (vector == VIRTIO_NO_VECTOR) { |
| return; |
| } |
| /* |
| * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue |
| * vector == VIRTIO_QUEUE_MAX: configuration change notification |
| * bits beyond that are unused and should never be notified for |
| */ |
| assert(vector <= VIRTIO_QUEUE_MAX); |
| |
| if (vector < VIRTIO_QUEUE_MAX) { |
| if (!dev->indicators) { |
| return; |
| } |
| if (sch->thinint_active) { |
| /* |
| * In the adapter interrupt case, indicators points to a |
| * memory area that may be (way) larger than 64 bit and |
| * ind_bit indicates the start of the indicators in a big |
| * endian notation. |
| */ |
| uint64_t ind_bit = dev->routes.adapter.ind_offset; |
| |
| virtio_set_ind_atomic(sch, dev->indicators->addr + |
| (ind_bit + vector) / 8, |
| 0x80 >> ((ind_bit + vector) % 8)); |
| if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, |
| 0x01)) { |
| css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); |
| } |
| } else { |
| assert(vector < NR_CLASSIC_INDICATOR_BITS); |
| indicators = address_space_ldq(&address_space_memory, |
| dev->indicators->addr, |
| MEMTXATTRS_UNSPECIFIED, |
| NULL); |
| indicators |= 1ULL << vector; |
| address_space_stq(&address_space_memory, dev->indicators->addr, |
| indicators, MEMTXATTRS_UNSPECIFIED, NULL); |
| css_conditional_io_interrupt(sch); |
| } |
| } else { |
| if (!dev->indicators2) { |
| return; |
| } |
| indicators = address_space_ldq(&address_space_memory, |
| dev->indicators2->addr, |
| MEMTXATTRS_UNSPECIFIED, |
| NULL); |
| indicators |= 1ULL; |
| address_space_stq(&address_space_memory, dev->indicators2->addr, |
| indicators, MEMTXATTRS_UNSPECIFIED, NULL); |
| css_conditional_io_interrupt(sch); |
| } |
| } |
| |
| static void virtio_ccw_reset(DeviceState *d) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); |
| |
| virtio_ccw_reset_virtio(dev); |
| if (vdc->parent_reset) { |
| vdc->parent_reset(d); |
| } |
| } |
| |
| static void virtio_ccw_vmstate_change(DeviceState *d, bool running) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| |
| if (running) { |
| virtio_ccw_start_ioeventfd(dev); |
| } else { |
| virtio_ccw_stop_ioeventfd(dev); |
| } |
| } |
| |
| static bool virtio_ccw_query_guest_notifiers(DeviceState *d) |
| { |
| CcwDevice *dev = CCW_DEVICE(d); |
| |
| return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); |
| } |
| |
| static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) |
| { |
| int r; |
| CcwDevice *ccw_dev = CCW_DEVICE(dev); |
| |
| if (!ccw_dev->sch->thinint_active) { |
| return -EINVAL; |
| } |
| |
| r = map_indicator(&dev->routes.adapter, dev->summary_indicator); |
| if (r) { |
| return r; |
| } |
| r = map_indicator(&dev->routes.adapter, dev->indicators); |
| if (r) { |
| return r; |
| } |
| dev->routes.adapter.summary_addr = dev->summary_indicator->map; |
| dev->routes.adapter.ind_addr = dev->indicators->map; |
| |
| return 0; |
| } |
| |
| static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) |
| { |
| int i; |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| int ret; |
| S390FLICState *fs = s390_get_flic(); |
| S390FLICStateClass *fsc = s390_get_flic_class(fs); |
| |
| ret = virtio_ccw_get_mappings(dev); |
| if (ret) { |
| return ret; |
| } |
| for (i = 0; i < nvqs; i++) { |
| if (!virtio_queue_get_num(vdev, i)) { |
| break; |
| } |
| } |
| dev->routes.num_routes = i; |
| return fsc->add_adapter_routes(fs, &dev->routes); |
| } |
| |
| static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) |
| { |
| S390FLICState *fs = s390_get_flic(); |
| S390FLICStateClass *fsc = s390_get_flic_class(fs); |
| |
| fsc->release_adapter_routes(fs, &dev->routes); |
| } |
| |
| static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) |
| { |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| VirtQueue *vq = virtio_get_queue(vdev, n); |
| EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
| |
| return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, |
| dev->routes.gsi[n]); |
| } |
| |
| static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) |
| { |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| VirtQueue *vq = virtio_get_queue(vdev, n); |
| EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
| int ret; |
| |
| ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, |
| dev->routes.gsi[n]); |
| assert(ret == 0); |
| } |
| |
| static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, |
| bool assign, bool with_irqfd) |
| { |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| VirtQueue *vq = virtio_get_queue(vdev, n); |
| EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); |
| VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); |
| |
| 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); |
| if (with_irqfd) { |
| r = virtio_ccw_add_irqfd(dev, n); |
| if (r) { |
| virtio_queue_set_guest_notifier_fd_handler(vq, false, |
| with_irqfd); |
| return r; |
| } |
| } |
| /* |
| * We do not support individual masking for channel devices, so we |
| * need to manually trigger any guest masking callbacks here. |
| */ |
| if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { |
| k->guest_notifier_mask(vdev, n, false); |
| } |
| /* get lost events and re-inject */ |
| if (k->guest_notifier_pending && |
| k->guest_notifier_pending(vdev, n)) { |
| event_notifier_set(notifier); |
| } |
| } else { |
| if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { |
| k->guest_notifier_mask(vdev, n, true); |
| } |
| if (with_irqfd) { |
| virtio_ccw_remove_irqfd(dev, n); |
| } |
| virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); |
| event_notifier_cleanup(notifier); |
| } |
| return 0; |
| } |
| |
| static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, |
| bool assigned) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| CcwDevice *ccw_dev = CCW_DEVICE(d); |
| bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); |
| int r, n; |
| |
| if (with_irqfd && assigned) { |
| /* irq routes need to be set up before assigning irqfds */ |
| r = virtio_ccw_setup_irqroutes(dev, nvqs); |
| if (r < 0) { |
| goto irqroute_error; |
| } |
| } |
| for (n = 0; n < nvqs; n++) { |
| if (!virtio_queue_get_num(vdev, n)) { |
| break; |
| } |
| r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); |
| if (r < 0) { |
| goto assign_error; |
| } |
| } |
| if (with_irqfd && !assigned) { |
| /* release irq routes after irqfds have been released */ |
| virtio_ccw_release_irqroutes(dev, nvqs); |
| } |
| return 0; |
| |
| assign_error: |
| while (--n >= 0) { |
| virtio_ccw_set_guest_notifier(dev, n, !assigned, false); |
| } |
| irqroute_error: |
| if (with_irqfd && assigned) { |
| virtio_ccw_release_irqroutes(dev, nvqs); |
| } |
| return r; |
| } |
| |
| static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| |
| qemu_put_be16(f, virtio_queue_vector(vdev, n)); |
| } |
| |
| static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| uint16_t vector; |
| |
| qemu_get_be16s(f, &vector); |
| virtio_queue_set_vector(vdev, n , vector); |
| |
| return 0; |
| } |
| |
| static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); |
| } |
| |
| static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); |
| } |
| |
| static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| |
| if (dev->max_rev >= 1) { |
| virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); |
| } |
| } |
| |
| /* This is called by virtio-bus just after the device is plugged. */ |
| static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); |
| CcwDevice *ccw_dev = CCW_DEVICE(d); |
| SubchDev *sch = ccw_dev->sch; |
| int n = virtio_get_num_queues(vdev); |
| S390FLICState *flic = s390_get_flic(); |
| |
| if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { |
| dev->max_rev = 0; |
| } |
| |
| if (!virtio_ccw_rev_max(dev) && !virtio_legacy_allowed(vdev)) { |
| /* |
| * To avoid migration issues, we allow legacy mode when legacy |
| * check is disabled in the old machine types (< 5.1). |
| */ |
| if (virtio_legacy_check_disabled(vdev)) { |
| warn_report("device requires revision >= 1, but for backward " |
| "compatibility max_revision=0 is allowed"); |
| } else { |
| error_setg(errp, "Invalid value of property max_rev " |
| "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); |
| return; |
| } |
| } |
| |
| if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { |
| error_setg(errp, "The number of virtqueues %d " |
| "exceeds virtio limit %d", n, |
| VIRTIO_QUEUE_MAX); |
| return; |
| } |
| if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { |
| error_setg(errp, "The number of virtqueues %d " |
| "exceeds flic adapter route limit %d", n, |
| flic->adapter_routes_max_batch); |
| return; |
| } |
| |
| sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); |
| |
| |
| css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, |
| d->hotplugged, 1); |
| } |
| |
| static void virtio_ccw_device_unplugged(DeviceState *d) |
| { |
| VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); |
| |
| virtio_ccw_stop_ioeventfd(dev); |
| } |
| /**************** Virtio-ccw Bus Device Descriptions *******************/ |
| |
| static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) |
| { |
| VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; |
| |
| virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); |
| virtio_ccw_device_realize(_dev, errp); |
| } |
| |
| static void virtio_ccw_busdev_unrealize(DeviceState *dev) |
| { |
| VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; |
| |
| virtio_ccw_device_unrealize(_dev); |
| } |
| |
| static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, |
| DeviceState *dev, Error **errp) |
| { |
| VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); |
| |
| virtio_ccw_stop_ioeventfd(_dev); |
| } |
| |
| static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); |
| VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); |
| |
| k->unplug = virtio_ccw_busdev_unplug; |
| dc->realize = virtio_ccw_busdev_realize; |
| dc->unrealize = virtio_ccw_busdev_unrealize; |
| device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); |
| } |
| |
| static const TypeInfo virtio_ccw_device_info = { |
| .name = TYPE_VIRTIO_CCW_DEVICE, |
| .parent = TYPE_CCW_DEVICE, |
| .instance_size = sizeof(VirtioCcwDevice), |
| .class_init = virtio_ccw_device_class_init, |
| .class_size = sizeof(VirtIOCCWDeviceClass), |
| .abstract = true, |
| }; |
| |
| /* virtio-ccw-bus */ |
| |
| static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, |
| VirtioCcwDevice *dev) |
| { |
| DeviceState *qdev = DEVICE(dev); |
| char virtio_bus_name[] = "virtio-bus"; |
| |
| qbus_init(bus, bus_size, TYPE_VIRTIO_CCW_BUS, qdev, virtio_bus_name); |
| } |
| |
| static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) |
| { |
| VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); |
| BusClass *bus_class = BUS_CLASS(klass); |
| |
| bus_class->max_dev = 1; |
| k->notify = virtio_ccw_notify; |
| k->vmstate_change = virtio_ccw_vmstate_change; |
| k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; |
| k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; |
| k->save_queue = virtio_ccw_save_queue; |
| k->load_queue = virtio_ccw_load_queue; |
| k->save_config = virtio_ccw_save_config; |
| k->load_config = virtio_ccw_load_config; |
| k->pre_plugged = virtio_ccw_pre_plugged; |
| k->device_plugged = virtio_ccw_device_plugged; |
| k->device_unplugged = virtio_ccw_device_unplugged; |
| k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; |
| k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; |
| } |
| |
| static const TypeInfo virtio_ccw_bus_info = { |
| .name = TYPE_VIRTIO_CCW_BUS, |
| .parent = TYPE_VIRTIO_BUS, |
| .instance_size = sizeof(VirtioCcwBusState), |
| .class_size = sizeof(VirtioCcwBusClass), |
| .class_init = virtio_ccw_bus_class_init, |
| }; |
| |
| static void virtio_ccw_register(void) |
| { |
| type_register_static(&virtio_ccw_bus_info); |
| type_register_static(&virtio_ccw_device_info); |
| } |
| |
| type_init(virtio_ccw_register) |
