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[Qemu-devel] [PATCH 2/2] virtio: disable notifications again after poll
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 2/2] virtio: disable notifications again after poll succeeded |
Date: |
Thu, 12 Jan 2017 11:46:11 +0000 |
While AioContext is in polling mode virtqueue notifications are not
necessary. Some device virtqueue handlers enable notifications. Make
sure they stay disabled to avoid unnecessary vmexits.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
hw/virtio/virtio.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index f04ab7a..34065c7 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -2126,6 +2126,9 @@ static bool virtio_queue_host_notifier_aio_poll(void
*opaque)
}
virtio_queue_notify_aio_vq(vq);
+
+ /* In case the handler function re-enabled notifications */
+ virtio_queue_set_notification(vq, 0);
return true;
}
--
2.9.3
- [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Stefan Hajnoczi, 2017/01/12
- [Qemu-devel] [PATCH 1/2] Revert "virtio: turn vq->notification into a nested counter", Stefan Hajnoczi, 2017/01/12
- [Qemu-devel] [PATCH 2/2] virtio: disable notifications again after poll succeeded,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Doug Goldstein, 2017/01/12
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Michael S. Tsirkin, 2017/01/12
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Stefan Hajnoczi, 2017/01/13
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Doug Goldstein, 2017/01/13
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Stefan Hajnoczi, 2017/01/16
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Doug Goldstein, 2017/01/16
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Michael S. Tsirkin, 2017/01/16
- Re: [Qemu-devel] [PATCH 0/2] virtio: revert virtio_queue_set_notification() nesting, Stefan Hajnoczi, 2017/01/17