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virtio: fix 1.0 virtqueue migration

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1.0 does not requires physically-contiguous pages layout for a
virtqueue. So we could not infer avail and used from desc. This means
we need to migrate vring.avail and vring.used when host support virtio
1.0. This fixes malfunction of virtio 1.0 device after migration.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2015-08-05 17:50:07 +08:00 • committed by Michael S. Tsirkin
parent 2be4f242b5
commit 74aae7b22b
2 changed files with 62 additions and 0 deletions
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6
include/hw/virtio/virtio.h
View file

@ -272,6 +272,12 @@ static inline bool virtio_has_feature(VirtIODevice *vdev, unsigned int fbit)
return __virtio_has_feature(vdev->guest_features, fbit);
}
static inline bool virtio_host_has_feature(VirtIODevice *vdev,
unsigned int fbit)
{
return __virtio_has_feature(vdev->host_features, fbit);
}
static inline bool virtio_is_big_endian(VirtIODevice *vdev)
{
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {