[RFC,10/18] vdpa: move iommu_list to vhost_vdpa_shared

Commit Message

Eugenio Perez Martin Oct. 19, 2023, 2:34 p.m. UTC

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 <[e-mail]>
---
 include/hw/virtio/vhost-vdpa.h | 2 +-
 hw/virtio/vhost-vdpa.c         | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

Patch

diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
index 5bd964dac5..3880b9e7f2 100644
--- a/include/hw/virtio/vhost-vdpa.h
+++ b/include/hw/virtio/vhost-vdpa.h
@@ -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;
 
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 66ae8ff6f4..2295daa7cc 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -278,7 +278,7 @@  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;
@@ -291,7 +291,7 @@  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) {