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virtio: Report real progress in VQ aio poll handler

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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>
This commit is contained in:
Fam Zheng 2017-02-09 16:40:47 +08:00 • committed by Michael S. Tsirkin
parent 4bb571d857
commit 0793169870
8 changed files with 45 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/hw/virtio/virtio-blk.h
View file

@ -80,6 +80,6 @@ typedef struct MultiReqBuffer {
bool is_write;
} MultiReqBuffer;
void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq);
bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq);
#endif

6
include/hw/virtio/virtio-scsi.h
View file

@ -126,9 +126,9 @@ void virtio_scsi_common_realize(DeviceState *dev, Error **errp,
VirtIOHandleOutput cmd);
void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp);
void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq);
void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq);
void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq);
bool virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq);
bool virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq);
bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq);
void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req);
void virtio_scsi_free_req(VirtIOSCSIReq *req);
void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,

4
include/hw/virtio/virtio.h
View file

@ -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);