vfio: Dirty page tracking when vIOMMU is enabled
When vIOMMU is enabled, register MAP notifier from log_sync when all devices in container are in stop and copy phase of migration. Call replay and get dirty pages from notifier callback. Suggested-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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@ -442,8 +442,8 @@ static bool vfio_listener_skipped_section(MemoryRegionSection *section)
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}
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/* Called with rcu_read_lock held. */
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static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr,
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bool *read_only)
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static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr,
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ram_addr_t *ram_addr, bool *read_only)
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{
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MemoryRegion *mr;
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hwaddr xlat;
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@ -474,8 +474,17 @@ static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr,
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return false;
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}
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if (vaddr) {
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*vaddr = memory_region_get_ram_ptr(mr) + xlat;
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}
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if (ram_addr) {
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*ram_addr = memory_region_get_ram_addr(mr) + xlat;
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}
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if (read_only) {
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*read_only = !writable || mr->readonly;
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}
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return true;
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}
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@ -485,7 +494,6 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
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VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
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VFIOContainer *container = giommu->container;
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hwaddr iova = iotlb->iova + giommu->iommu_offset;
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bool read_only;
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void *vaddr;
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int ret;
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@ -501,7 +509,9 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
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rcu_read_lock();
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if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
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if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) {
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bool read_only;
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if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) {
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goto out;
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}
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/*
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@ -899,11 +909,77 @@ err_out:
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return ret;
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}
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typedef struct {
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IOMMUNotifier n;
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VFIOGuestIOMMU *giommu;
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} vfio_giommu_dirty_notifier;
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static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
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{
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vfio_giommu_dirty_notifier *gdn = container_of(n,
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vfio_giommu_dirty_notifier, n);
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VFIOGuestIOMMU *giommu = gdn->giommu;
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VFIOContainer *container = giommu->container;
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hwaddr iova = iotlb->iova + giommu->iommu_offset;
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ram_addr_t translated_addr;
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trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask);
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if (iotlb->target_as != &address_space_memory) {
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error_report("Wrong target AS \"%s\", only system memory is allowed",
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iotlb->target_as->name ? iotlb->target_as->name : "none");
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return;
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}
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rcu_read_lock();
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if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) {
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int ret;
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ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1,
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translated_addr);
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if (ret) {
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error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
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"0x%"HWADDR_PRIx") = %d (%m)",
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container, iova,
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iotlb->addr_mask + 1, ret);
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}
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}
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rcu_read_unlock();
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}
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static int vfio_sync_dirty_bitmap(VFIOContainer *container,
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MemoryRegionSection *section)
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{
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ram_addr_t ram_addr;
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if (memory_region_is_iommu(section->mr)) {
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VFIOGuestIOMMU *giommu;
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QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
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if (MEMORY_REGION(giommu->iommu) == section->mr &&
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giommu->n.start == section->offset_within_region) {
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Int128 llend;
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vfio_giommu_dirty_notifier gdn = { .giommu = giommu };
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int idx = memory_region_iommu_attrs_to_index(giommu->iommu,
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MEMTXATTRS_UNSPECIFIED);
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llend = int128_add(int128_make64(section->offset_within_region),
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section->size);
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llend = int128_sub(llend, int128_one());
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iommu_notifier_init(&gdn.n,
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vfio_iommu_map_dirty_notify,
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IOMMU_NOTIFIER_MAP,
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section->offset_within_region,
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int128_get64(llend),
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idx);
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memory_region_iommu_replay(giommu->iommu, &gdn.n);
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break;
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}
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}
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return 0;
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}
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ram_addr = memory_region_get_ram_addr(section->mr) +
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section->offset_within_region;
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@ -164,3 +164,4 @@ vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
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vfio_load_state_device_data(const char *name, uint64_t data_offset, uint64_t data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64
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vfio_load_cleanup(const char *name) " (%s)"
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vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start) "container fd=%d, iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64
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vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu dirty @ 0x%"PRIx64" - 0x%"PRIx64
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