[Qemu-devel] [PATCH] qemu:virtio: Allow guest to defer VIRTIO_F_NOTIFY_ON_EMPTY

[Qemu-devel] [PATCH] qemu:virtio: Allow guest to defer VIRTIO_F_NOTIFY_ON_EMPTY

[Alex Williamson]

There may be cases where the guest does not want the avail queue
interrupt, even when it's empty.  For the virtio-net case, the
guest may use a different buffering scheme or decide polling for
used buffers is more efficient.  This can be accomplished by simply
checking for whether the guest has acknowledged the existing notify
on empty flag.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
---

 hw/virtio.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/virtio.c b/hw/virtio.c
index b94ab0f..08ea16d 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -726,9 +726,10 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 
 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
 {
-    /* Always notify when queue is empty */
-    if ((vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx) &&
-        (vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT))
+    /* Always notify when queue is empty (when feature acknowledge) */
+    if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
+        (!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
+         (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx)))
         return;
 
     vdev->isr |= 0x01;

[Qemu-devel] Re: [PATCH] qemu:virtio: Allow guest to defer VIRTIO_F_NOTIFY_ON_EMPTY

[Anthony Liguori]

Alex Williamson wrote:
> There may be cases where the guest does not want the avail queue
> interrupt, even when it's empty.  For the virtio-net case, the
> guest may use a different buffering scheme or decide polling for
> used buffers is more efficient.  This can be accomplished by simply
> checking for whether the guest has acknowledged the existing notify
> on empty flag.
>
> Signed-off-by: Alex Williamson <alex.williamson@hp.com>
>   

Applied to trunk and stable.  Thanks.

Regards,

Anthony Liguori

>