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virtio-blk: live migrate s->rq with multiqueue

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Add a field for the virtqueue index when migrating the s->rq request
list.  The new field is only needed when num_queues > 1.  Existing QEMUs
are unaffected by this change and therefore virtio-blk migration stays
compatible.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1466511196-12612-6-git-send-email-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2016-06-21 13:13:14 +01:00
parent edaffd9f0b
commit 30d8bf6d17
1 changed files with 19 additions and 1 deletions
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20
hw/block/virtio-blk.c
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@ -808,6 +808,11 @@ static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
while (req) {
qemu_put_sbyte(f, 1);
if (s->conf.num_queues > 1) {
qemu_put_be32(f, virtio_get_queue_index(req->vq));
}
qemu_put_virtqueue_element(f, &req->elem);
req = req->next;
}
@ -831,9 +836,22 @@ static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
VirtIOBlock *s = VIRTIO_BLK(vdev);
while (qemu_get_sbyte(f)) {
unsigned nvqs = s->conf.num_queues;
unsigned vq_idx = 0;
VirtIOBlockReq *req;
if (nvqs > 1) {
vq_idx = qemu_get_be32(f);
if (vq_idx >= nvqs) {
error_report("Invalid virtqueue index in request list: %#x",
vq_idx);
return -EINVAL;
}
}
req = qemu_get_virtqueue_element(f, sizeof(VirtIOBlockReq));
virtio_blk_init_request(s, s->vq, req);
virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
req->next = s->rq;
s->rq = req;
}