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vdpa: Add device migration blocker

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Since the vhost-vdpa device is exposing _F_LOG, adding a migration blocker if
it uses CVQ.

However, qemu is able to migrate simple devices with no CVQ as long as
they use SVQ. To allow it, add a placeholder error to vhost_vdpa, and
only add to vhost_dev when used. vhost_dev machinery place the migration
blocker if needed.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-07-20 08:59:45 +02:00 • committed by Jason Wang
parent 8170ab3f43
commit c156d5bf2b
2 changed files with 16 additions and 0 deletions
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15
hw/virtio/vhost-vdpa.c
View file

@ -20,6 +20,7 @@
#include "hw/virtio/vhost-shadow-virtqueue.h"
#include "hw/virtio/vhost-vdpa.h"
#include "exec/address-spaces.h"
#include "migration/blocker.h"
#include "qemu/cutils.h"
#include "qemu/main-loop.h"
#include "cpu.h"
@ -1022,6 +1023,13 @@ static bool vhost_vdpa_svqs_start(struct vhost_dev *dev)
return true;
}
if (v->migration_blocker) {
int r = migrate_add_blocker(v->migration_blocker, &err);
if (unlikely(r < 0)) {
return false;
}
}
for (i = 0; i < v->shadow_vqs->len; ++i) {
VirtQueue *vq = virtio_get_queue(dev->vdev, dev->vq_index + i);
VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, i);
@ -1064,6 +1072,10 @@ err:
vhost_svq_stop(svq);
}
if (v->migration_blocker) {
migrate_del_blocker(v->migration_blocker);
}
return false;
}
@ -1083,6 +1095,9 @@ static bool vhost_vdpa_svqs_stop(struct vhost_dev *dev)
}
}
if (v->migration_blocker) {
migrate_del_blocker(v->migration_blocker);
}
return true;
}