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vhost: allow batching hint without size
authorJason Wang <jasowang@redhat.com>
Thu, 10 Mar 2022 07:52:11 +0000 (15:52 +0800)
committerMichael S. Tsirkin <mst@redhat.com>
Thu, 10 Mar 2022 13:12:04 +0000 (08:12 -0500)
commit95932ab2ea07b79cdb33121e2f40ccda9e6a73b5
tree168fc062bd85d9bdf0f2437df3f610b293218d85
parent3dd7d135e75cb37c8501ba02977332a2a487dd39
vhost: allow batching hint without size

Commit e2ae38cf3d91 ("vhost: fix hung thread due to erroneous iotlb
entries") tries to reject the IOTLB message whose size is zero. But
the size is not necessarily meaningful, one example is the batching
hint, so the commit breaks that.

Fixing this be reject zero size message only if the message is used to
update/invalidate the IOTLB.

Fixes: e2ae38cf3d91 ("vhost: fix hung thread due to erroneous iotlb entries")
Reported-by: Eli Cohen <elic@nvidia.com>
Cc: Anirudh Rayabharam <mail@anirudhrb.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20220310075211.4801-1-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Eli Cohen <elic@nvidia.com>
drivers/vhost/vhost.c