diff options
| author | Si-Wei Liu <si-wei.liu@oracle.com> | 2022-05-06 19:28:16 -0700 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-05-16 16:15:41 -0400 |
| commit | 6aee7e4233f6467f69531fcd352adff028f3f5ea (patch) | |
| tree | 24d52d877a59592b38c993289fccef1146adcbb5 /hw/virtio | |
| parent | 6f3910b5eee00b8cc959e94659c0d524c482a418 (diff) | |
vhost-vdpa: backend feature should set only once
The vhost_vdpa_one_time_request() branch in
vhost_vdpa_set_backend_cap() incorrectly sends down
ioctls on vhost_dev with non-zero index. This may
end up with multiple VHOST_SET_BACKEND_FEATURES
ioctl calls sent down on the vhost-vdpa fd that is
shared between all these vhost_dev's.
To fix it, send down ioctl only once via the first
vhost_dev with index 0. Toggle the polarity of the
vhost_vdpa_one_time_request() test should do the
trick.
Fixes: 4d191cfdc7de ("vhost-vdpa: classify one time request")
Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <1651890498-24478-6-git-send-email-si-wei.liu@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/virtio')
| -rw-r--r-- | hw/virtio/vhost-vdpa.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index ed106bff47..870ab74b04 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -667,7 +667,7 @@ static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) features &= f; - if (vhost_vdpa_one_time_request(dev)) { + if (!vhost_vdpa_one_time_request(dev)) { r = vhost_vdpa_call(dev, VHOST_SET_BACKEND_FEATURES, &features); if (r) { return -EFAULT; |