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libvhost-user: support resuming vq->last_avail_idx based on used_idx

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This is the same workaround as commit 523b018dde, which was lost
with libvhost-user transition in commit e10e798c85.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-08-29 17:27:50 +02:00 • committed by Michael S. Tsirkin
parent 0b4a775188
commit 35480cbfcb
2 changed files with 20 additions and 0 deletions
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13
contrib/libvhost-user/libvhost-user.c
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@ -521,6 +521,19 @@ vu_set_vring_addr_exec(VuDev *dev, VhostUserMsg *vmsg)
vq->used_idx = vq->vring.used->idx;
if (vq->last_avail_idx != vq->used_idx) {
bool resume = dev->iface->queue_is_processed_in_order &&
dev->iface->queue_is_processed_in_order(dev, index);
DPRINT("Last avail index != used index: %u != %u%s\n",
vq->last_avail_idx, vq->used_idx,
resume ? ", resuming" : "");
if (resume) {
vq->shadow_avail_idx = vq->last_avail_idx = vq->used_idx;
}
}
return false;
}