[1/1] virtio: avoid using guest_notifier_mask in vhost-user mode

Commit Message

Wei Huang Dec. 15, 2016, 6:23 p.m. UTC

Because guest mask notifier cannot be used in vhost-user mode, a boolean
flag "use_guest_notifier_mask" was added in commit 5669655aafd to disable
the use of guest mask notifier under virtio-pci. However this flag wasn't
checked in other virtio devices, such as virtio-mmio. In our tests, it
caused assertion error under "vhost-user + virtio-mmio". This patch
addresses this problem by adding a check before guest_notifier_mask is
called.

Signed-off-by: Wei Huang <[e-mail]>
---
 hw/s390x/virtio-ccw.c   | 4 ++--
 hw/virtio/virtio-mmio.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

Patch

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index f5c1d98..0765068 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1098,7 +1098,7 @@  static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
          * We do not support individual masking for channel devices, so we
          * need to manually trigger any guest masking callbacks here.
          */
-        if (k->guest_notifier_mask) {
+        if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) {
             k->guest_notifier_mask(vdev, n, false);
         }
         /* get lost events and re-inject */
@@ -1107,7 +1107,7 @@  static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
             event_notifier_set(notifier);
         }
     } else {
-        if (k->guest_notifier_mask) {
+        if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) {
             k->guest_notifier_mask(vdev, n, true);
         }
         if (with_irqfd) {
diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index 17412cb..60654dc 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -402,7 +402,7 @@  static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
         event_notifier_cleanup(notifier);
     }
 
-    if (vdc->guest_notifier_mask) {
+    if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
         vdc->guest_notifier_mask(vdev, n, !assign);
     }