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[PULL,10/15] virtio: invalidate memory in vring_set_avail_event()

Message ID 1488435591-17882-11-git-send-email-mst@redhat.com
State New
Headers show

Commit Message

Michael S. Tsirkin March 2, 2017, 6:20 a.m. UTC 
From: Stefan Hajnoczi <stefanha@redhat.com>

Remember to invalidate the avail event field so the memory pages are
marked dirty.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
---
 hw/virtio/virtio.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index bf8a644..294c909 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -282,6 +282,7 @@  static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val)
     caches = atomic_rcu_read(&vq->vring.caches);
     pa = offsetof(VRingUsed, ring[vq->vring.num]);
     virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val);
+    address_space_cache_invalidate(&caches->used, pa, sizeof(val));
 }
 
 void virtio_queue_set_notification(VirtQueue *vq, int enable)