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vdpa: move iommu_list to vhost_vdpa_shared

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Next patches will register the vhost_vdpa memory listener while the VM
is migrating at the destination, so we can map the memory to the device
before stopping the VM at the source.  The main goal is to reduce the
downtime.

However, the destination QEMU is unaware of which vhost_vdpa device will
register its memory_listener.  If the source guest has CVQ enabled, it
will be the CVQ device.  Otherwise, it  will be the first one.

Move the iommu_list member to VhostVDPAShared so all vhost_vdpa can use
it, rather than always in the first / last vhost_vdpa.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20231221174322.3130442-11-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2023-12-21 18:43:19 +01:00 committed by Michael S. Tsirkin
parent 74e76c7d5b
commit 3c6d12a3b1
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
hw/virtio/vhost-vdpa.c
View File

@ -279,7 +279,7 @@ static void vhost_vdpa_iommu_region_add(MemoryListener *listener,
return;
}
QLIST_INSERT_HEAD(&v->iommu_list, iommu, iommu_next);
QLIST_INSERT_HEAD(&v->shared->iommu_list, iommu, iommu_next);
memory_region_iommu_replay(iommu->iommu_mr, &iommu->n);
return;
@ -292,7 +292,7 @@ static void vhost_vdpa_iommu_region_del(MemoryListener *listener,
struct vdpa_iommu *iommu;
QLIST_FOREACH(iommu, &v->iommu_list, iommu_next)
QLIST_FOREACH(iommu, &v->shared->iommu_list, iommu_next)
{
if (MEMORY_REGION(iommu->iommu_mr) == section->mr &&
iommu->n.start == section->offset_within_region) {

2
include/hw/virtio/vhost-vdpa.h
View File

@ -34,6 +34,7 @@ typedef struct VhostVDPAHostNotifier {
typedef struct vhost_vdpa_shared {
int device_fd;
struct vhost_vdpa_iova_range iova_range;
QLIST_HEAD(, vdpa_iommu) iommu_list;
/* IOVA mapping used by the Shadow Virtqueue */
VhostIOVATree *iova_tree;
@ -62,7 +63,6 @@ typedef struct vhost_vdpa {
struct vhost_dev *dev;
Error *migration_blocker;
VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX];
QLIST_HEAD(, vdpa_iommu) iommu_list;
IOMMUNotifier n;
} VhostVDPA;