| /* |
| * vhost support |
| * |
| * Copyright Red Hat, Inc. 2010 |
| * |
| * Authors: |
| * Michael S. Tsirkin <mst@redhat.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| * Contributions after 2012-01-13 are licensed under the terms of the |
| * GNU GPL, version 2 or (at your option) any later version. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "hw/virtio/vhost.h" |
| #include "qemu/atomic.h" |
| #include "qemu/range.h" |
| #include "qemu/error-report.h" |
| #include "qemu/memfd.h" |
| #include "standard-headers/linux/vhost_types.h" |
| #include "exec/address-spaces.h" |
| #include "hw/virtio/virtio-bus.h" |
| #include "hw/virtio/virtio-access.h" |
| #include "migration/blocker.h" |
| #include "migration/qemu-file-types.h" |
| #include "sysemu/dma.h" |
| #include "trace.h" |
| |
| /* enabled until disconnected backend stabilizes */ |
| #define _VHOST_DEBUG 1 |
| |
| #ifdef _VHOST_DEBUG |
| #define VHOST_OPS_DEBUG(fmt, ...) \ |
| do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \ |
| strerror(errno), errno); } while (0) |
| #else |
| #define VHOST_OPS_DEBUG(fmt, ...) \ |
| do { } while (0) |
| #endif |
| |
| static struct vhost_log *vhost_log; |
| static struct vhost_log *vhost_log_shm; |
| |
| static unsigned int used_memslots; |
| static QLIST_HEAD(, vhost_dev) vhost_devices = |
| QLIST_HEAD_INITIALIZER(vhost_devices); |
| |
| bool vhost_has_free_slot(void) |
| { |
| unsigned int slots_limit = ~0U; |
| struct vhost_dev *hdev; |
| |
| QLIST_FOREACH(hdev, &vhost_devices, entry) { |
| unsigned int r = hdev->vhost_ops->vhost_backend_memslots_limit(hdev); |
| slots_limit = MIN(slots_limit, r); |
| } |
| return slots_limit > used_memslots; |
| } |
| |
| static void vhost_dev_sync_region(struct vhost_dev *dev, |
| MemoryRegionSection *section, |
| uint64_t mfirst, uint64_t mlast, |
| uint64_t rfirst, uint64_t rlast) |
| { |
| vhost_log_chunk_t *log = dev->log->log; |
| |
| uint64_t start = MAX(mfirst, rfirst); |
| uint64_t end = MIN(mlast, rlast); |
| vhost_log_chunk_t *from = log + start / VHOST_LOG_CHUNK; |
| vhost_log_chunk_t *to = log + end / VHOST_LOG_CHUNK + 1; |
| uint64_t addr = QEMU_ALIGN_DOWN(start, VHOST_LOG_CHUNK); |
| |
| if (end < start) { |
| return; |
| } |
| assert(end / VHOST_LOG_CHUNK < dev->log_size); |
| assert(start / VHOST_LOG_CHUNK < dev->log_size); |
| |
| for (;from < to; ++from) { |
| vhost_log_chunk_t log; |
| /* We first check with non-atomic: much cheaper, |
| * and we expect non-dirty to be the common case. */ |
| if (!*from) { |
| addr += VHOST_LOG_CHUNK; |
| continue; |
| } |
| /* Data must be read atomically. We don't really need barrier semantics |
| * but it's easier to use atomic_* than roll our own. */ |
| log = atomic_xchg(from, 0); |
| while (log) { |
| int bit = ctzl(log); |
| hwaddr page_addr; |
| hwaddr section_offset; |
| hwaddr mr_offset; |
| page_addr = addr + bit * VHOST_LOG_PAGE; |
| section_offset = page_addr - section->offset_within_address_space; |
| mr_offset = section_offset + section->offset_within_region; |
| memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE); |
| log &= ~(0x1ull << bit); |
| } |
| addr += VHOST_LOG_CHUNK; |
| } |
| } |
| |
| static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, |
| MemoryRegionSection *section, |
| hwaddr first, |
| hwaddr last) |
| { |
| int i; |
| hwaddr start_addr; |
| hwaddr end_addr; |
| |
| if (!dev->log_enabled || !dev->started) { |
| return 0; |
| } |
| start_addr = section->offset_within_address_space; |
| end_addr = range_get_last(start_addr, int128_get64(section->size)); |
| start_addr = MAX(first, start_addr); |
| end_addr = MIN(last, end_addr); |
| |
| for (i = 0; i < dev->mem->nregions; ++i) { |
| struct vhost_memory_region *reg = dev->mem->regions + i; |
| vhost_dev_sync_region(dev, section, start_addr, end_addr, |
| reg->guest_phys_addr, |
| range_get_last(reg->guest_phys_addr, |
| reg->memory_size)); |
| } |
| for (i = 0; i < dev->nvqs; ++i) { |
| struct vhost_virtqueue *vq = dev->vqs + i; |
| |
| if (!vq->used_phys && !vq->used_size) { |
| continue; |
| } |
| |
| vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, |
| range_get_last(vq->used_phys, vq->used_size)); |
| } |
| return 0; |
| } |
| |
| static void vhost_log_sync(MemoryListener *listener, |
| MemoryRegionSection *section) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| memory_listener); |
| vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL); |
| } |
| |
| static void vhost_log_sync_range(struct vhost_dev *dev, |
| hwaddr first, hwaddr last) |
| { |
| int i; |
| /* FIXME: this is N^2 in number of sections */ |
| for (i = 0; i < dev->n_mem_sections; ++i) { |
| MemoryRegionSection *section = &dev->mem_sections[i]; |
| vhost_sync_dirty_bitmap(dev, section, first, last); |
| } |
| } |
| |
| static uint64_t vhost_get_log_size(struct vhost_dev *dev) |
| { |
| uint64_t log_size = 0; |
| int i; |
| for (i = 0; i < dev->mem->nregions; ++i) { |
| struct vhost_memory_region *reg = dev->mem->regions + i; |
| uint64_t last = range_get_last(reg->guest_phys_addr, |
| reg->memory_size); |
| log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); |
| } |
| for (i = 0; i < dev->nvqs; ++i) { |
| struct vhost_virtqueue *vq = dev->vqs + i; |
| |
| if (!vq->used_phys && !vq->used_size) { |
| continue; |
| } |
| |
| uint64_t last = vq->used_phys + vq->used_size - 1; |
| log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1); |
| } |
| return log_size; |
| } |
| |
| static struct vhost_log *vhost_log_alloc(uint64_t size, bool share) |
| { |
| Error *err = NULL; |
| struct vhost_log *log; |
| uint64_t logsize = size * sizeof(*(log->log)); |
| int fd = -1; |
| |
| log = g_new0(struct vhost_log, 1); |
| if (share) { |
| log->log = qemu_memfd_alloc("vhost-log", logsize, |
| F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, |
| &fd, &err); |
| if (err) { |
| error_report_err(err); |
| g_free(log); |
| return NULL; |
| } |
| memset(log->log, 0, logsize); |
| } else { |
| log->log = g_malloc0(logsize); |
| } |
| |
| log->size = size; |
| log->refcnt = 1; |
| log->fd = fd; |
| |
| return log; |
| } |
| |
| static struct vhost_log *vhost_log_get(uint64_t size, bool share) |
| { |
| struct vhost_log *log = share ? vhost_log_shm : vhost_log; |
| |
| if (!log || log->size != size) { |
| log = vhost_log_alloc(size, share); |
| if (share) { |
| vhost_log_shm = log; |
| } else { |
| vhost_log = log; |
| } |
| } else { |
| ++log->refcnt; |
| } |
| |
| return log; |
| } |
| |
| static void vhost_log_put(struct vhost_dev *dev, bool sync) |
| { |
| struct vhost_log *log = dev->log; |
| |
| if (!log) { |
| return; |
| } |
| |
| --log->refcnt; |
| if (log->refcnt == 0) { |
| /* Sync only the range covered by the old log */ |
| if (dev->log_size && sync) { |
| vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1); |
| } |
| |
| if (vhost_log == log) { |
| g_free(log->log); |
| vhost_log = NULL; |
| } else if (vhost_log_shm == log) { |
| qemu_memfd_free(log->log, log->size * sizeof(*(log->log)), |
| log->fd); |
| vhost_log_shm = NULL; |
| } |
| |
| g_free(log); |
| } |
| |
| dev->log = NULL; |
| dev->log_size = 0; |
| } |
| |
| static bool vhost_dev_log_is_shared(struct vhost_dev *dev) |
| { |
| return dev->vhost_ops->vhost_requires_shm_log && |
| dev->vhost_ops->vhost_requires_shm_log(dev); |
| } |
| |
| static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) |
| { |
| struct vhost_log *log = vhost_log_get(size, vhost_dev_log_is_shared(dev)); |
| uint64_t log_base = (uintptr_t)log->log; |
| int r; |
| |
| /* inform backend of log switching, this must be done before |
| releasing the current log, to ensure no logging is lost */ |
| r = dev->vhost_ops->vhost_set_log_base(dev, log_base, log); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_log_base failed"); |
| } |
| |
| vhost_log_put(dev, true); |
| dev->log = log; |
| dev->log_size = size; |
| } |
| |
| static int vhost_dev_has_iommu(struct vhost_dev *dev) |
| { |
| VirtIODevice *vdev = dev->vdev; |
| |
| /* |
| * For vhost, VIRTIO_F_IOMMU_PLATFORM means the backend support |
| * incremental memory mapping API via IOTLB API. For platform that |
| * does not have IOMMU, there's no need to enable this feature |
| * which may cause unnecessary IOTLB miss/update trnasactions. |
| */ |
| return vdev->dma_as != &address_space_memory && |
| virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); |
| } |
| |
| static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, |
| hwaddr *plen, bool is_write) |
| { |
| if (!vhost_dev_has_iommu(dev)) { |
| return cpu_physical_memory_map(addr, plen, is_write); |
| } else { |
| return (void *)(uintptr_t)addr; |
| } |
| } |
| |
| static void vhost_memory_unmap(struct vhost_dev *dev, void *buffer, |
| hwaddr len, int is_write, |
| hwaddr access_len) |
| { |
| if (!vhost_dev_has_iommu(dev)) { |
| cpu_physical_memory_unmap(buffer, len, is_write, access_len); |
| } |
| } |
| |
| static int vhost_verify_ring_part_mapping(void *ring_hva, |
| uint64_t ring_gpa, |
| uint64_t ring_size, |
| void *reg_hva, |
| uint64_t reg_gpa, |
| uint64_t reg_size) |
| { |
| uint64_t hva_ring_offset; |
| uint64_t ring_last = range_get_last(ring_gpa, ring_size); |
| uint64_t reg_last = range_get_last(reg_gpa, reg_size); |
| |
| if (ring_last < reg_gpa || ring_gpa > reg_last) { |
| return 0; |
| } |
| /* check that whole ring's is mapped */ |
| if (ring_last > reg_last) { |
| return -ENOMEM; |
| } |
| /* check that ring's MemoryRegion wasn't replaced */ |
| hva_ring_offset = ring_gpa - reg_gpa; |
| if (ring_hva != reg_hva + hva_ring_offset) { |
| return -EBUSY; |
| } |
| |
| return 0; |
| } |
| |
| static int vhost_verify_ring_mappings(struct vhost_dev *dev, |
| void *reg_hva, |
| uint64_t reg_gpa, |
| uint64_t reg_size) |
| { |
| int i, j; |
| int r = 0; |
| const char *part_name[] = { |
| "descriptor table", |
| "available ring", |
| "used ring" |
| }; |
| |
| if (vhost_dev_has_iommu(dev)) { |
| return 0; |
| } |
| |
| for (i = 0; i < dev->nvqs; ++i) { |
| struct vhost_virtqueue *vq = dev->vqs + i; |
| |
| if (vq->desc_phys == 0) { |
| continue; |
| } |
| |
| j = 0; |
| r = vhost_verify_ring_part_mapping( |
| vq->desc, vq->desc_phys, vq->desc_size, |
| reg_hva, reg_gpa, reg_size); |
| if (r) { |
| break; |
| } |
| |
| j++; |
| r = vhost_verify_ring_part_mapping( |
| vq->avail, vq->avail_phys, vq->avail_size, |
| reg_hva, reg_gpa, reg_size); |
| if (r) { |
| break; |
| } |
| |
| j++; |
| r = vhost_verify_ring_part_mapping( |
| vq->used, vq->used_phys, vq->used_size, |
| reg_hva, reg_gpa, reg_size); |
| if (r) { |
| break; |
| } |
| } |
| |
| if (r == -ENOMEM) { |
| error_report("Unable to map %s for ring %d", part_name[j], i); |
| } else if (r == -EBUSY) { |
| error_report("%s relocated for ring %d", part_name[j], i); |
| } |
| return r; |
| } |
| |
| static bool vhost_section(struct vhost_dev *dev, MemoryRegionSection *section) |
| { |
| bool result; |
| bool log_dirty = memory_region_get_dirty_log_mask(section->mr) & |
| ~(1 << DIRTY_MEMORY_MIGRATION); |
| result = memory_region_is_ram(section->mr) && |
| !memory_region_is_rom(section->mr); |
| |
| /* Vhost doesn't handle any block which is doing dirty-tracking other |
| * than migration; this typically fires on VGA areas. |
| */ |
| result &= !log_dirty; |
| |
| if (result && dev->vhost_ops->vhost_backend_mem_section_filter) { |
| result &= |
| dev->vhost_ops->vhost_backend_mem_section_filter(dev, section); |
| } |
| |
| trace_vhost_section(section->mr->name, result); |
| return result; |
| } |
| |
| static void vhost_begin(MemoryListener *listener) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| memory_listener); |
| dev->tmp_sections = NULL; |
| dev->n_tmp_sections = 0; |
| } |
| |
| static void vhost_commit(MemoryListener *listener) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| memory_listener); |
| MemoryRegionSection *old_sections; |
| int n_old_sections; |
| uint64_t log_size; |
| size_t regions_size; |
| int r; |
| int i; |
| bool changed = false; |
| |
| /* Note we can be called before the device is started, but then |
| * starting the device calls set_mem_table, so we need to have |
| * built the data structures. |
| */ |
| old_sections = dev->mem_sections; |
| n_old_sections = dev->n_mem_sections; |
| dev->mem_sections = dev->tmp_sections; |
| dev->n_mem_sections = dev->n_tmp_sections; |
| |
| if (dev->n_mem_sections != n_old_sections) { |
| changed = true; |
| } else { |
| /* Same size, lets check the contents */ |
| for (int i = 0; i < n_old_sections; i++) { |
| if (!MemoryRegionSection_eq(&old_sections[i], |
| &dev->mem_sections[i])) { |
| changed = true; |
| break; |
| } |
| } |
| } |
| |
| trace_vhost_commit(dev->started, changed); |
| if (!changed) { |
| goto out; |
| } |
| |
| /* Rebuild the regions list from the new sections list */ |
| regions_size = offsetof(struct vhost_memory, regions) + |
| dev->n_mem_sections * sizeof dev->mem->regions[0]; |
| dev->mem = g_realloc(dev->mem, regions_size); |
| dev->mem->nregions = dev->n_mem_sections; |
| used_memslots = dev->mem->nregions; |
| for (i = 0; i < dev->n_mem_sections; i++) { |
| struct vhost_memory_region *cur_vmr = dev->mem->regions + i; |
| struct MemoryRegionSection *mrs = dev->mem_sections + i; |
| |
| cur_vmr->guest_phys_addr = mrs->offset_within_address_space; |
| cur_vmr->memory_size = int128_get64(mrs->size); |
| cur_vmr->userspace_addr = |
| (uintptr_t)memory_region_get_ram_ptr(mrs->mr) + |
| mrs->offset_within_region; |
| cur_vmr->flags_padding = 0; |
| } |
| |
| if (!dev->started) { |
| goto out; |
| } |
| |
| for (i = 0; i < dev->mem->nregions; i++) { |
| if (vhost_verify_ring_mappings(dev, |
| (void *)(uintptr_t)dev->mem->regions[i].userspace_addr, |
| dev->mem->regions[i].guest_phys_addr, |
| dev->mem->regions[i].memory_size)) { |
| error_report("Verify ring failure on region %d", i); |
| abort(); |
| } |
| } |
| |
| if (!dev->log_enabled) { |
| r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
| } |
| goto out; |
| } |
| log_size = vhost_get_log_size(dev); |
| /* We allocate an extra 4K bytes to log, |
| * to reduce the * number of reallocations. */ |
| #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log) |
| /* To log more, must increase log size before table update. */ |
| if (dev->log_size < log_size) { |
| vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER); |
| } |
| r = dev->vhost_ops->vhost_set_mem_table(dev, dev->mem); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
| } |
| /* To log less, can only decrease log size after table update. */ |
| if (dev->log_size > log_size + VHOST_LOG_BUFFER) { |
| vhost_dev_log_resize(dev, log_size); |
| } |
| |
| out: |
| /* Deref the old list of sections, this must happen _after_ the |
| * vhost_set_mem_table to ensure the client isn't still using the |
| * section we're about to unref. |
| */ |
| while (n_old_sections--) { |
| memory_region_unref(old_sections[n_old_sections].mr); |
| } |
| g_free(old_sections); |
| return; |
| } |
| |
| /* Adds the section data to the tmp_section structure. |
| * It relies on the listener calling us in memory address order |
| * and for each region (via the _add and _nop methods) to |
| * join neighbours. |
| */ |
| static void vhost_region_add_section(struct vhost_dev *dev, |
| MemoryRegionSection *section) |
| { |
| bool need_add = true; |
| uint64_t mrs_size = int128_get64(section->size); |
| uint64_t mrs_gpa = section->offset_within_address_space; |
| uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + |
| section->offset_within_region; |
| RAMBlock *mrs_rb = section->mr->ram_block; |
| |
| trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size, |
| mrs_host); |
| |
| if (dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER) { |
| /* Round the section to it's page size */ |
| /* First align the start down to a page boundary */ |
| size_t mrs_page = qemu_ram_pagesize(mrs_rb); |
| uint64_t alignage = mrs_host & (mrs_page - 1); |
| if (alignage) { |
| mrs_host -= alignage; |
| mrs_size += alignage; |
| mrs_gpa -= alignage; |
| } |
| /* Now align the size up to a page boundary */ |
| alignage = mrs_size & (mrs_page - 1); |
| if (alignage) { |
| mrs_size += mrs_page - alignage; |
| } |
| trace_vhost_region_add_section_aligned(section->mr->name, mrs_gpa, |
| mrs_size, mrs_host); |
| } |
| |
| if (dev->n_tmp_sections) { |
| /* Since we already have at least one section, lets see if |
| * this extends it; since we're scanning in order, we only |
| * have to look at the last one, and the FlatView that calls |
| * us shouldn't have overlaps. |
| */ |
| MemoryRegionSection *prev_sec = dev->tmp_sections + |
| (dev->n_tmp_sections - 1); |
| uint64_t prev_gpa_start = prev_sec->offset_within_address_space; |
| uint64_t prev_size = int128_get64(prev_sec->size); |
| uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); |
| uint64_t prev_host_start = |
| (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + |
| prev_sec->offset_within_region; |
| uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); |
| |
| if (mrs_gpa <= (prev_gpa_end + 1)) { |
| /* OK, looks like overlapping/intersecting - it's possible that |
| * the rounding to page sizes has made them overlap, but they should |
| * match up in the same RAMBlock if they do. |
| */ |
| if (mrs_gpa < prev_gpa_start) { |
| error_report("%s:Section '%s' rounded to %"PRIx64 |
| " prior to previous '%s' %"PRIx64, |
| __func__, section->mr->name, mrs_gpa, |
| prev_sec->mr->name, prev_gpa_start); |
| /* A way to cleanly fail here would be better */ |
| return; |
| } |
| /* Offset from the start of the previous GPA to this GPA */ |
| size_t offset = mrs_gpa - prev_gpa_start; |
| |
| if (prev_host_start + offset == mrs_host && |
| section->mr == prev_sec->mr && |
| (!dev->vhost_ops->vhost_backend_can_merge || |
| dev->vhost_ops->vhost_backend_can_merge(dev, |
| mrs_host, mrs_size, |
| prev_host_start, prev_size))) { |
| uint64_t max_end = MAX(prev_host_end, mrs_host + mrs_size); |
| need_add = false; |
| prev_sec->offset_within_address_space = |
| MIN(prev_gpa_start, mrs_gpa); |
| prev_sec->offset_within_region = |
| MIN(prev_host_start, mrs_host) - |
| (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr); |
| prev_sec->size = int128_make64(max_end - MIN(prev_host_start, |
| mrs_host)); |
| trace_vhost_region_add_section_merge(section->mr->name, |
| int128_get64(prev_sec->size), |
| prev_sec->offset_within_address_space, |
| prev_sec->offset_within_region); |
| } else { |
| /* adjoining regions are fine, but overlapping ones with |
| * different blocks/offsets shouldn't happen |
| */ |
| if (mrs_gpa != prev_gpa_end + 1) { |
| error_report("%s: Overlapping but not coherent sections " |
| "at %"PRIx64, |
| __func__, mrs_gpa); |
| return; |
| } |
| } |
| } |
| } |
| |
| if (need_add) { |
| ++dev->n_tmp_sections; |
| dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, |
| dev->n_tmp_sections); |
| dev->tmp_sections[dev->n_tmp_sections - 1] = *section; |
| /* The flatview isn't stable and we don't use it, making it NULL |
| * means we can memcmp the list. |
| */ |
| dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL; |
| memory_region_ref(section->mr); |
| } |
| } |
| |
| /* Used for both add and nop callbacks */ |
| static void vhost_region_addnop(MemoryListener *listener, |
| MemoryRegionSection *section) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| memory_listener); |
| |
| if (!vhost_section(dev, section)) { |
| return; |
| } |
| vhost_region_add_section(dev, section); |
| } |
| |
| static void vhost_iommu_unmap_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
| { |
| struct vhost_iommu *iommu = container_of(n, struct vhost_iommu, n); |
| struct vhost_dev *hdev = iommu->hdev; |
| hwaddr iova = iotlb->iova + iommu->iommu_offset; |
| |
| if (vhost_backend_invalidate_device_iotlb(hdev, iova, |
| iotlb->addr_mask + 1)) { |
| error_report("Fail to invalidate device iotlb"); |
| } |
| } |
| |
| static void vhost_iommu_region_add(MemoryListener *listener, |
| MemoryRegionSection *section) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| iommu_listener); |
| struct vhost_iommu *iommu; |
| Int128 end; |
| int iommu_idx, ret; |
| IOMMUMemoryRegion *iommu_mr; |
| Error *err = NULL; |
| |
| if (!memory_region_is_iommu(section->mr)) { |
| return; |
| } |
| |
| iommu_mr = IOMMU_MEMORY_REGION(section->mr); |
| |
| iommu = g_malloc0(sizeof(*iommu)); |
| end = int128_add(int128_make64(section->offset_within_region), |
| section->size); |
| end = int128_sub(end, int128_one()); |
| iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, |
| MEMTXATTRS_UNSPECIFIED); |
| iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify, |
| IOMMU_NOTIFIER_UNMAP, |
| section->offset_within_region, |
| int128_get64(end), |
| iommu_idx); |
| iommu->mr = section->mr; |
| iommu->iommu_offset = section->offset_within_address_space - |
| section->offset_within_region; |
| iommu->hdev = dev; |
| ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, &err); |
| if (ret) { |
| error_report_err(err); |
| exit(1); |
| } |
| QLIST_INSERT_HEAD(&dev->iommu_list, iommu, iommu_next); |
| /* TODO: can replay help performance here? */ |
| } |
| |
| static void vhost_iommu_region_del(MemoryListener *listener, |
| MemoryRegionSection *section) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| iommu_listener); |
| struct vhost_iommu *iommu; |
| |
| if (!memory_region_is_iommu(section->mr)) { |
| return; |
| } |
| |
| QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) { |
| if (iommu->mr == section->mr && |
| iommu->n.start == section->offset_within_region) { |
| memory_region_unregister_iommu_notifier(iommu->mr, |
| &iommu->n); |
| QLIST_REMOVE(iommu, iommu_next); |
| g_free(iommu); |
| break; |
| } |
| } |
| } |
| |
| static int vhost_virtqueue_set_addr(struct vhost_dev *dev, |
| struct vhost_virtqueue *vq, |
| unsigned idx, bool enable_log) |
| { |
| struct vhost_vring_addr addr = { |
| .index = idx, |
| .desc_user_addr = (uint64_t)(unsigned long)vq->desc, |
| .avail_user_addr = (uint64_t)(unsigned long)vq->avail, |
| .used_user_addr = (uint64_t)(unsigned long)vq->used, |
| .log_guest_addr = vq->used_phys, |
| .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0, |
| }; |
| int r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_vring_addr failed"); |
| return -errno; |
| } |
| return 0; |
| } |
| |
| static int vhost_dev_set_features(struct vhost_dev *dev, |
| bool enable_log) |
| { |
| uint64_t features = dev->acked_features; |
| int r; |
| if (enable_log) { |
| features |= 0x1ULL << VHOST_F_LOG_ALL; |
| } |
| if (!vhost_dev_has_iommu(dev)) { |
| features &= ~(0x1ULL << VIRTIO_F_IOMMU_PLATFORM); |
| } |
| r = dev->vhost_ops->vhost_set_features(dev, features); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_features failed"); |
| } |
| return r < 0 ? -errno : 0; |
| } |
| |
| static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log) |
| { |
| int r, i, idx; |
| r = vhost_dev_set_features(dev, enable_log); |
| if (r < 0) { |
| goto err_features; |
| } |
| for (i = 0; i < dev->nvqs; ++i) { |
| idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
| r = vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, |
| enable_log); |
| if (r < 0) { |
| goto err_vq; |
| } |
| } |
| return 0; |
| err_vq: |
| for (; i >= 0; --i) { |
| idx = dev->vhost_ops->vhost_get_vq_index(dev, dev->vq_index + i); |
| vhost_virtqueue_set_addr(dev, dev->vqs + i, idx, |
| dev->log_enabled); |
| } |
| vhost_dev_set_features(dev, dev->log_enabled); |
| err_features: |
| return r; |
| } |
| |
| static int vhost_migration_log(MemoryListener *listener, int enable) |
| { |
| struct vhost_dev *dev = container_of(listener, struct vhost_dev, |
| memory_listener); |
| int r; |
| if (!!enable == dev->log_enabled) { |
| return 0; |
| } |
| if (!dev->started) { |
| dev->log_enabled = enable; |
| return 0; |
| } |
| if (!enable) { |
| r = vhost_dev_set_log(dev, false); |
| if (r < 0) { |
| return r; |
| } |
| vhost_log_put(dev, false); |
| } else { |
| vhost_dev_log_resize(dev, vhost_get_log_size(dev)); |
| r = vhost_dev_set_log(dev, true); |
| if (r < 0) { |
| return r; |
| } |
| } |
| dev->log_enabled = enable; |
| return 0; |
| } |
| |
| static void vhost_log_global_start(MemoryListener *listener) |
| { |
| int r; |
| |
| r = vhost_migration_log(listener, true); |
| if (r < 0) { |
| abort(); |
| } |
| } |
| |
| static void vhost_log_global_stop(MemoryListener *listener) |
| { |
| int r; |
| |
| r = vhost_migration_log(listener, false); |
| if (r < 0) { |
| abort(); |
| } |
| } |
| |
| static void vhost_log_start(MemoryListener *listener, |
| MemoryRegionSection *section, |
| int old, int new) |
| { |
| /* FIXME: implement */ |
| } |
| |
| static void vhost_log_stop(MemoryListener *listener, |
| MemoryRegionSection *section, |
| int old, int new) |
| { |
| /* FIXME: implement */ |
| } |
| |
| /* The vhost driver natively knows how to handle the vrings of non |
| * cross-endian legacy devices and modern devices. Only legacy devices |
| * exposed to a bi-endian guest may require the vhost driver to use a |
| * specific endianness. |
| */ |
| static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) |
| { |
| if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
| return false; |
| } |
| #ifdef HOST_WORDS_BIGENDIAN |
| return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_LITTLE; |
| #else |
| return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; |
| #endif |
| } |
| |
| static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, |
| bool is_big_endian, |
| int vhost_vq_index) |
| { |
| struct vhost_vring_state s = { |
| .index = vhost_vq_index, |
| .num = is_big_endian |
| }; |
| |
| if (!dev->vhost_ops->vhost_set_vring_endian(dev, &s)) { |
| return 0; |
| } |
| |
| VHOST_OPS_DEBUG("vhost_set_vring_endian failed"); |
| if (errno == ENOTTY) { |
| error_report("vhost does not support cross-endian"); |
| return -ENOSYS; |
| } |
| |
| return -errno; |
| } |
| |
| static int vhost_memory_region_lookup(struct vhost_dev *hdev, |
| uint64_t gpa, uint64_t *uaddr, |
| uint64_t *len) |
| { |
| int i; |
| |
| for (i = 0; i < hdev->mem->nregions; i++) { |
| struct vhost_memory_region *reg = hdev->mem->regions + i; |
| |
| if (gpa >= reg->guest_phys_addr && |
| reg->guest_phys_addr + reg->memory_size > gpa) { |
| *uaddr = reg->userspace_addr + gpa - reg->guest_phys_addr; |
| *len = reg->guest_phys_addr + reg->memory_size - gpa; |
| return 0; |
| } |
| } |
| |
| return -EFAULT; |
| } |
| |
| int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write) |
| { |
| IOMMUTLBEntry iotlb; |
| uint64_t uaddr, len; |
| int ret = -EFAULT; |
| |
| RCU_READ_LOCK_GUARD(); |
| |
| trace_vhost_iotlb_miss(dev, 1); |
| |
| iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, |
| iova, write, |
| MEMTXATTRS_UNSPECIFIED); |
| if (iotlb.target_as != NULL) { |
| ret = vhost_memory_region_lookup(dev, iotlb.translated_addr, |
| &uaddr, &len); |
| if (ret) { |
| trace_vhost_iotlb_miss(dev, 3); |
| error_report("Fail to lookup the translated address " |
| "%"PRIx64, iotlb.translated_addr); |
| goto out; |
| } |
| |
| len = MIN(iotlb.addr_mask + 1, len); |
| iova = iova & ~iotlb.addr_mask; |
| |
| ret = vhost_backend_update_device_iotlb(dev, iova, uaddr, |
| len, iotlb.perm); |
| if (ret) { |
| trace_vhost_iotlb_miss(dev, 4); |
| error_report("Fail to update device iotlb"); |
| goto out; |
| } |
| } |
| |
| trace_vhost_iotlb_miss(dev, 2); |
| |
| out: |
| return ret; |
| } |
| |
| static int vhost_virtqueue_start(struct vhost_dev *dev, |
| struct VirtIODevice *vdev, |
| struct vhost_virtqueue *vq, |
| unsigned idx) |
| { |
| BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
| VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); |
| hwaddr s, l, a; |
| int r; |
| int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
| struct vhost_vring_file file = { |
| .index = vhost_vq_index |
| }; |
| struct vhost_vring_state state = { |
| .index = vhost_vq_index |
| }; |
| struct VirtQueue *vvq = virtio_get_queue(vdev, idx); |
| |
| a = virtio_queue_get_desc_addr(vdev, idx); |
| if (a == 0) { |
| /* Queue might not be ready for start */ |
| return 0; |
| } |
| |
| vq->num = state.num = virtio_queue_get_num(vdev, idx); |
| r = dev->vhost_ops->vhost_set_vring_num(dev, &state); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_set_vring_num failed"); |
| return -errno; |
| } |
| |
| state.num = virtio_queue_get_last_avail_idx(vdev, idx); |
| r = dev->vhost_ops->vhost_set_vring_base(dev, &state); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_set_vring_base failed"); |
| return -errno; |
| } |
| |
| if (vhost_needs_vring_endian(vdev)) { |
| r = vhost_virtqueue_set_vring_endian_legacy(dev, |
| virtio_is_big_endian(vdev), |
| vhost_vq_index); |
| if (r) { |
| return -errno; |
| } |
| } |
| |
| vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); |
| vq->desc_phys = a; |
| vq->desc = vhost_memory_map(dev, a, &l, false); |
| if (!vq->desc || l != s) { |
| r = -ENOMEM; |
| goto fail_alloc_desc; |
| } |
| vq->avail_size = s = l = virtio_queue_get_avail_size(vdev, idx); |
| vq->avail_phys = a = virtio_queue_get_avail_addr(vdev, idx); |
| vq->avail = vhost_memory_map(dev, a, &l, false); |
| if (!vq->avail || l != s) { |
| r = -ENOMEM; |
| goto fail_alloc_avail; |
| } |
| vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx); |
| vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx); |
| vq->used = vhost_memory_map(dev, a, &l, true); |
| if (!vq->used || l != s) { |
| r = -ENOMEM; |
| goto fail_alloc_used; |
| } |
| |
| r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled); |
| if (r < 0) { |
| r = -errno; |
| goto fail_alloc; |
| } |
| |
| file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); |
| r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_set_vring_kick failed"); |
| r = -errno; |
| goto fail_kick; |
| } |
| |
| /* Clear and discard previous events if any. */ |
| event_notifier_test_and_clear(&vq->masked_notifier); |
| |
| /* Init vring in unmasked state, unless guest_notifier_mask |
| * will do it later. |
| */ |
| if (!vdev->use_guest_notifier_mask) { |
| /* TODO: check and handle errors. */ |
| vhost_virtqueue_mask(dev, vdev, idx, false); |
| } |
| |
| if (k->query_guest_notifiers && |
| k->query_guest_notifiers(qbus->parent) && |
| virtio_queue_vector(vdev, idx) == VIRTIO_NO_VECTOR) { |
| file.fd = -1; |
| r = dev->vhost_ops->vhost_set_vring_call(dev, &file); |
| if (r) { |
| goto fail_vector; |
| } |
| } |
| |
| return 0; |
| |
| fail_vector: |
| fail_kick: |
| fail_alloc: |
| vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
| 0, 0); |
| fail_alloc_used: |
| vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), |
| 0, 0); |
| fail_alloc_avail: |
| vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), |
| 0, 0); |
| fail_alloc_desc: |
| return r; |
| } |
| |
| static void vhost_virtqueue_stop(struct vhost_dev *dev, |
| struct VirtIODevice *vdev, |
| struct vhost_virtqueue *vq, |
| unsigned idx) |
| { |
| int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); |
| struct vhost_vring_state state = { |
| .index = vhost_vq_index, |
| }; |
| int r; |
| |
| if (virtio_queue_get_desc_addr(vdev, idx) == 0) { |
| /* Don't stop the virtqueue which might have not been started */ |
| return; |
| } |
| |
| r = dev->vhost_ops->vhost_get_vring_base(dev, &state); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost VQ %u ring restore failed: %d", idx, r); |
| /* Connection to the backend is broken, so let's sync internal |
| * last avail idx to the device used idx. |
| */ |
| virtio_queue_restore_last_avail_idx(vdev, idx); |
| } else { |
| virtio_queue_set_last_avail_idx(vdev, idx, state.num); |
| } |
| virtio_queue_invalidate_signalled_used(vdev, idx); |
| virtio_queue_update_used_idx(vdev, idx); |
| |
| /* In the cross-endian case, we need to reset the vring endianness to |
| * native as legacy devices expect so by default. |
| */ |
| if (vhost_needs_vring_endian(vdev)) { |
| vhost_virtqueue_set_vring_endian_legacy(dev, |
| !virtio_is_big_endian(vdev), |
| vhost_vq_index); |
| } |
| |
| vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), |
| 1, virtio_queue_get_used_size(vdev, idx)); |
| vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), |
| 0, virtio_queue_get_avail_size(vdev, idx)); |
| vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), |
| 0, virtio_queue_get_desc_size(vdev, idx)); |
| } |
| |
| static void vhost_eventfd_add(MemoryListener *listener, |
| MemoryRegionSection *section, |
| bool match_data, uint64_t data, EventNotifier *e) |
| { |
| } |
| |
| static void vhost_eventfd_del(MemoryListener *listener, |
| MemoryRegionSection *section, |
| bool match_data, uint64_t data, EventNotifier *e) |
| { |
| } |
| |
| static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, |
| int n, uint32_t timeout) |
| { |
| int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); |
| struct vhost_vring_state state = { |
| .index = vhost_vq_index, |
| .num = timeout, |
| }; |
| int r; |
| |
| if (!dev->vhost_ops->vhost_set_vring_busyloop_timeout) { |
| return -EINVAL; |
| } |
| |
| r = dev->vhost_ops->vhost_set_vring_busyloop_timeout(dev, &state); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed"); |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int vhost_virtqueue_init(struct vhost_dev *dev, |
| struct vhost_virtqueue *vq, int n) |
| { |
| int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, n); |
| struct vhost_vring_file file = { |
| .index = vhost_vq_index, |
| }; |
| int r = event_notifier_init(&vq->masked_notifier, 0); |
| if (r < 0) { |
| return r; |
| } |
| |
| file.fd = event_notifier_get_fd(&vq->masked_notifier); |
| r = dev->vhost_ops->vhost_set_vring_call(dev, &file); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_set_vring_call failed"); |
| r = -errno; |
| goto fail_call; |
| } |
| |
| vq->dev = dev; |
| |
| return 0; |
| fail_call: |
| event_notifier_cleanup(&vq->masked_notifier); |
| return r; |
| } |
| |
| static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq) |
| { |
| event_notifier_cleanup(&vq->masked_notifier); |
| } |
| |
| int vhost_dev_init(struct vhost_dev *hdev, void *opaque, |
| VhostBackendType backend_type, uint32_t busyloop_timeout) |
| { |
| uint64_t features; |
| int i, r, n_initialized_vqs = 0; |
| Error *local_err = NULL; |
| |
| hdev->vdev = NULL; |
| hdev->migration_blocker = NULL; |
| |
| r = vhost_set_backend_type(hdev, backend_type); |
| assert(r >= 0); |
| |
| r = hdev->vhost_ops->vhost_backend_init(hdev, opaque); |
| if (r < 0) { |
| goto fail; |
| } |
| |
| r = hdev->vhost_ops->vhost_set_owner(hdev); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_owner failed"); |
| goto fail; |
| } |
| |
| r = hdev->vhost_ops->vhost_get_features(hdev, &features); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_get_features failed"); |
| goto fail; |
| } |
| |
| for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) { |
| r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i); |
| if (r < 0) { |
| goto fail; |
| } |
| } |
| |
| if (busyloop_timeout) { |
| for (i = 0; i < hdev->nvqs; ++i) { |
| r = vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, |
| busyloop_timeout); |
| if (r < 0) { |
| goto fail_busyloop; |
| } |
| } |
| } |
| |
| hdev->features = features; |
| |
| hdev->memory_listener = (MemoryListener) { |
| .begin = vhost_begin, |
| .commit = vhost_commit, |
| .region_add = vhost_region_addnop, |
| .region_nop = vhost_region_addnop, |
| .log_start = vhost_log_start, |
| .log_stop = vhost_log_stop, |
| .log_sync = vhost_log_sync, |
| .log_global_start = vhost_log_global_start, |
| .log_global_stop = vhost_log_global_stop, |
| .eventfd_add = vhost_eventfd_add, |
| .eventfd_del = vhost_eventfd_del, |
| .priority = 10 |
| }; |
| |
| hdev->iommu_listener = (MemoryListener) { |
| .region_add = vhost_iommu_region_add, |
| .region_del = vhost_iommu_region_del, |
| }; |
| |
| if (hdev->migration_blocker == NULL) { |
| if (!(hdev->features & (0x1ULL << VHOST_F_LOG_ALL))) { |
| error_setg(&hdev->migration_blocker, |
| "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature."); |
| } else if (vhost_dev_log_is_shared(hdev) && !qemu_memfd_alloc_check()) { |
| error_setg(&hdev->migration_blocker, |
| "Migration disabled: failed to allocate shared memory"); |
| } |
| } |
| |
| if (hdev->migration_blocker != NULL) { |
| r = migrate_add_blocker(hdev->migration_blocker, &local_err); |
| if (local_err) { |
| error_report_err(local_err); |
| error_free(hdev->migration_blocker); |
| goto fail_busyloop; |
| } |
| } |
| |
| hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions)); |
| hdev->n_mem_sections = 0; |
| hdev->mem_sections = NULL; |
| hdev->log = NULL; |
| hdev->log_size = 0; |
| hdev->log_enabled = false; |
| hdev->started = false; |
| memory_listener_register(&hdev->memory_listener, &address_space_memory); |
| QLIST_INSERT_HEAD(&vhost_devices, hdev, entry); |
| |
| if (used_memslots > hdev->vhost_ops->vhost_backend_memslots_limit(hdev)) { |
| error_report("vhost backend memory slots limit is less" |
| " than current number of present memory slots"); |
| r = -1; |
| if (busyloop_timeout) { |
| goto fail_busyloop; |
| } else { |
| goto fail; |
| } |
| } |
| |
| return 0; |
| |
| fail_busyloop: |
| while (--i >= 0) { |
| vhost_virtqueue_set_busyloop_timeout(hdev, hdev->vq_index + i, 0); |
| } |
| fail: |
| hdev->nvqs = n_initialized_vqs; |
| vhost_dev_cleanup(hdev); |
| return r; |
| } |
| |
| void vhost_dev_cleanup(struct vhost_dev *hdev) |
| { |
| int i; |
| |
| for (i = 0; i < hdev->nvqs; ++i) { |
| vhost_virtqueue_cleanup(hdev->vqs + i); |
| } |
| if (hdev->mem) { |
| /* those are only safe after successful init */ |
| memory_listener_unregister(&hdev->memory_listener); |
| QLIST_REMOVE(hdev, entry); |
| } |
| if (hdev->migration_blocker) { |
| migrate_del_blocker(hdev->migration_blocker); |
| error_free(hdev->migration_blocker); |
| } |
| g_free(hdev->mem); |
| g_free(hdev->mem_sections); |
| if (hdev->vhost_ops) { |
| hdev->vhost_ops->vhost_backend_cleanup(hdev); |
| } |
| assert(!hdev->log); |
| |
| memset(hdev, 0, sizeof(struct vhost_dev)); |
| } |
| |
| /* Stop processing guest IO notifications in qemu. |
| * Start processing them in vhost in kernel. |
| */ |
| int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
| { |
| BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
| int i, r, e; |
| |
| /* We will pass the notifiers to the kernel, make sure that QEMU |
| * doesn't interfere. |
| */ |
| r = virtio_device_grab_ioeventfd(vdev); |
| if (r < 0) { |
| error_report("binding does not support host notifiers"); |
| goto fail; |
| } |
| |
| for (i = 0; i < hdev->nvqs; ++i) { |
| r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
| true); |
| if (r < 0) { |
| error_report("vhost VQ %d notifier binding failed: %d", i, -r); |
| goto fail_vq; |
| } |
| } |
| |
| return 0; |
| fail_vq: |
| while (--i >= 0) { |
| e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
| false); |
| if (e < 0) { |
| error_report("vhost VQ %d notifier cleanup error: %d", i, -r); |
| } |
| assert (e >= 0); |
| virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); |
| } |
| virtio_device_release_ioeventfd(vdev); |
| fail: |
| return r; |
| } |
| |
| /* Stop processing guest IO notifications in vhost. |
| * Start processing them in qemu. |
| * This might actually run the qemu handlers right away, |
| * so virtio in qemu must be completely setup when this is called. |
| */ |
| void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev) |
| { |
| BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
| int i, r; |
| |
| for (i = 0; i < hdev->nvqs; ++i) { |
| r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i, |
| false); |
| if (r < 0) { |
| error_report("vhost VQ %d notifier cleanup failed: %d", i, -r); |
| } |
| assert (r >= 0); |
| virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i); |
| } |
| virtio_device_release_ioeventfd(vdev); |
| } |
| |
| /* Test and clear event pending status. |
| * Should be called after unmask to avoid losing events. |
| */ |
| bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n) |
| { |
| struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index; |
| assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs); |
| return event_notifier_test_and_clear(&vq->masked_notifier); |
| } |
| |
| /* Mask/unmask events from this vq. */ |
| void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, |
| bool mask) |
| { |
| struct VirtQueue *vvq = virtio_get_queue(vdev, n); |
| int r, index = n - hdev->vq_index; |
| struct vhost_vring_file file; |
| |
| /* should only be called after backend is connected */ |
| assert(hdev->vhost_ops); |
| |
| if (mask) { |
| assert(vdev->use_guest_notifier_mask); |
| file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); |
| } else { |
| file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); |
| } |
| |
| file.index = hdev->vhost_ops->vhost_get_vq_index(hdev, n); |
| r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_vring_call failed"); |
| } |
| } |
| |
| uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, |
| uint64_t features) |
| { |
| const int *bit = feature_bits; |
| while (*bit != VHOST_INVALID_FEATURE_BIT) { |
| uint64_t bit_mask = (1ULL << *bit); |
| if (!(hdev->features & bit_mask)) { |
| features &= ~bit_mask; |
| } |
| bit++; |
| } |
| return features; |
| } |
| |
| void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, |
| uint64_t features) |
| { |
| const int *bit = feature_bits; |
| while (*bit != VHOST_INVALID_FEATURE_BIT) { |
| uint64_t bit_mask = (1ULL << *bit); |
| if (features & bit_mask) { |
| hdev->acked_features |= bit_mask; |
| } |
| bit++; |
| } |
| } |
| |
| int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, |
| uint32_t config_len) |
| { |
| assert(hdev->vhost_ops); |
| |
| if (hdev->vhost_ops->vhost_get_config) { |
| return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); |
| } |
| |
| return -1; |
| } |
| |
| int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, |
| uint32_t offset, uint32_t size, uint32_t flags) |
| { |
| assert(hdev->vhost_ops); |
| |
| if (hdev->vhost_ops->vhost_set_config) { |
| return hdev->vhost_ops->vhost_set_config(hdev, data, offset, |
| size, flags); |
| } |
| |
| return -1; |
| } |
| |
| void vhost_dev_set_config_notifier(struct vhost_dev *hdev, |
| const VhostDevConfigOps *ops) |
| { |
| hdev->config_ops = ops; |
| } |
| |
| void vhost_dev_free_inflight(struct vhost_inflight *inflight) |
| { |
| if (inflight->addr) { |
| qemu_memfd_free(inflight->addr, inflight->size, inflight->fd); |
| inflight->addr = NULL; |
| inflight->fd = -1; |
| } |
| } |
| |
| static int vhost_dev_resize_inflight(struct vhost_inflight *inflight, |
| uint64_t new_size) |
| { |
| Error *err = NULL; |
| int fd = -1; |
| void *addr = qemu_memfd_alloc("vhost-inflight", new_size, |
| F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL, |
| &fd, &err); |
| |
| if (err) { |
| error_report_err(err); |
| return -1; |
| } |
| |
| vhost_dev_free_inflight(inflight); |
| inflight->offset = 0; |
| inflight->addr = addr; |
| inflight->fd = fd; |
| inflight->size = new_size; |
| |
| return 0; |
| } |
| |
| void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f) |
| { |
| if (inflight->addr) { |
| qemu_put_be64(f, inflight->size); |
| qemu_put_be16(f, inflight->queue_size); |
| qemu_put_buffer(f, inflight->addr, inflight->size); |
| } else { |
| qemu_put_be64(f, 0); |
| } |
| } |
| |
| int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f) |
| { |
| uint64_t size; |
| |
| size = qemu_get_be64(f); |
| if (!size) { |
| return 0; |
| } |
| |
| if (inflight->size != size) { |
| if (vhost_dev_resize_inflight(inflight, size)) { |
| return -1; |
| } |
| } |
| inflight->queue_size = qemu_get_be16(f); |
| |
| qemu_get_buffer(f, inflight->addr, size); |
| |
| return 0; |
| } |
| |
| int vhost_dev_set_inflight(struct vhost_dev *dev, |
| struct vhost_inflight *inflight) |
| { |
| int r; |
| |
| if (dev->vhost_ops->vhost_set_inflight_fd && inflight->addr) { |
| r = dev->vhost_ops->vhost_set_inflight_fd(dev, inflight); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_set_inflight_fd failed"); |
| return -errno; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size, |
| struct vhost_inflight *inflight) |
| { |
| int r; |
| |
| if (dev->vhost_ops->vhost_get_inflight_fd) { |
| r = dev->vhost_ops->vhost_get_inflight_fd(dev, queue_size, inflight); |
| if (r) { |
| VHOST_OPS_DEBUG("vhost_get_inflight_fd failed"); |
| return -errno; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Host notifiers must be enabled at this point. */ |
| int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) |
| { |
| int i, r; |
| |
| /* should only be called after backend is connected */ |
| assert(hdev->vhost_ops); |
| |
| hdev->started = true; |
| hdev->vdev = vdev; |
| |
| r = vhost_dev_set_features(hdev, hdev->log_enabled); |
| if (r < 0) { |
| goto fail_features; |
| } |
| |
| if (vhost_dev_has_iommu(hdev)) { |
| memory_listener_register(&hdev->iommu_listener, vdev->dma_as); |
| } |
| |
| r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_mem_table failed"); |
| r = -errno; |
| goto fail_mem; |
| } |
| for (i = 0; i < hdev->nvqs; ++i) { |
| r = vhost_virtqueue_start(hdev, |
| vdev, |
| hdev->vqs + i, |
| hdev->vq_index + i); |
| if (r < 0) { |
| goto fail_vq; |
| } |
| } |
| |
| if (hdev->log_enabled) { |
| uint64_t log_base; |
| |
| hdev->log_size = vhost_get_log_size(hdev); |
| hdev->log = vhost_log_get(hdev->log_size, |
| vhost_dev_log_is_shared(hdev)); |
| log_base = (uintptr_t)hdev->log->log; |
| r = hdev->vhost_ops->vhost_set_log_base(hdev, |
| hdev->log_size ? log_base : 0, |
| hdev->log); |
| if (r < 0) { |
| VHOST_OPS_DEBUG("vhost_set_log_base failed"); |
| r = -errno; |
| goto fail_log; |
| } |
| } |
| |
| if (vhost_dev_has_iommu(hdev)) { |
| hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true); |
| |
| /* Update used ring information for IOTLB to work correctly, |
| * vhost-kernel code requires for this.*/ |
| for (i = 0; i < hdev->nvqs; ++i) { |
| struct vhost_virtqueue *vq = hdev->vqs + i; |
| vhost_device_iotlb_miss(hdev, vq->used_phys, true); |
| } |
| } |
| return 0; |
| fail_log: |
| vhost_log_put(hdev, false); |
| fail_vq: |
| while (--i >= 0) { |
| vhost_virtqueue_stop(hdev, |
| vdev, |
| hdev->vqs + i, |
| hdev->vq_index + i); |
| } |
| |
| fail_mem: |
| fail_features: |
| |
| hdev->started = false; |
| return r; |
| } |
| |
| /* Host notifiers must be enabled at this point. */ |
| void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev) |
| { |
| int i; |
| |
| /* should only be called after backend is connected */ |
| assert(hdev->vhost_ops); |
| |
| for (i = 0; i < hdev->nvqs; ++i) { |
| vhost_virtqueue_stop(hdev, |
| vdev, |
| hdev->vqs + i, |
| hdev->vq_index + i); |
| } |
| |
| if (vhost_dev_has_iommu(hdev)) { |
| hdev->vhost_ops->vhost_set_iotlb_callback(hdev, false); |
| memory_listener_unregister(&hdev->iommu_listener); |
| } |
| vhost_log_put(hdev, true); |
| hdev->started = false; |
| hdev->vdev = NULL; |
| } |
| |
| int vhost_net_set_backend(struct vhost_dev *hdev, |
| struct vhost_vring_file *file) |
| { |
| if (hdev->vhost_ops->vhost_net_set_backend) { |
| return hdev->vhost_ops->vhost_net_set_backend(hdev, file); |
| } |
| |
| return -1; |
| } |