diff options
| author | Fam Zheng <famz@redhat.com> | 2017-02-09 16:40:47 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-02-17 21:52:30 +0200 |
| commit | 0793169870f376bc9959b7d81df48ab4a90dcceb (patch) | |
| tree | 706cd7d990534f97bcf1dd9ca8ca09c4e7d350ff /include/hw/virtio/virtio.h | |
| parent | 4bb571d857d973d9308d9fdb1f48d983d6639bd4 (diff) | |
virtio: Report real progress in VQ aio poll handler
In virtio_queue_host_notifier_aio_poll, not all "!virtio_queue_empty()"
cases are making true progress.
Currently the offending one is virtio-scsi event queue, whose handler
does nothing if no event is pending. As a result aio_poll() will spin on
the "non-empty" VQ and take 100% host CPU.
Fix this by reporting actual progress from virtio queue aio handlers.
Reported-by: Ed Swierk <eswierk@skyportsystems.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Tested-by: Ed Swierk <eswierk@skyportsystems.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/hw/virtio/virtio.h')
| -rw-r--r-- | include/hw/virtio/virtio.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 525da24222..0863a254ba 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -154,6 +154,7 @@ void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3); void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name); typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *); +typedef bool (*VirtIOHandleAIOOutput)(VirtIODevice *, VirtQueue *); VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, VirtIOHandleOutput handle_output); @@ -284,8 +285,7 @@ bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev); EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); void virtio_queue_host_notifier_read(EventNotifier *n); void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, - void (*fn)(VirtIODevice *, - VirtQueue *)); + VirtIOHandleAIOOutput handle_output); VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); VirtQueue *virtio_vector_next_queue(VirtQueue *vq); |