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vdpa: move memory listener 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 memory listener to a common place 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: <20231221174322.3130442-14-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 18:43:22 +01:00 • committed by Michael S. Tsirkin
parent b06a38f2b0
commit f6fe3e333f
2 changed files with 40 additions and 46 deletions
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2
include/hw/virtio/vhost-vdpa.h
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@ -33,6 +33,7 @@ typedef struct VhostVDPAHostNotifier {
/* Info shared by all vhost_vdpa device models */
typedef struct vhost_vdpa_shared {
int device_fd;
MemoryListener listener;
struct vhost_vdpa_iova_range iova_range;
QLIST_HEAD(, vdpa_iommu) iommu_list;
@ -51,7 +52,6 @@ typedef struct vhost_vdpa_shared {
typedef struct vhost_vdpa {
int index;
uint32_t address_space_id;
MemoryListener listener;
uint64_t acked_features;
bool shadow_vqs_enabled;
/* Device suspended successfully */