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virtio-scsi: fix race between .ioeventfd_stop() and vq handler 

If the main loop thread invokes .ioeventfd_stop() just as the vq handler
function begins in the IOThread then the handler may lose the race for
the AioContext lock.  By the time the vq handler is able to acquire the
AioContext lock the ioeventfd has already been removed and the handler
isn't supposed to run anymore!

Use the new aio_wait_bh_oneshot() function to perform ioeventfd removal
from within the IOThread.  This way no races with the vq handler are
possible.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20180307144205.20619-4-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-03-07 14:42:04 +00:00
parent 1010cadf62
commit 184b962346
1 changed files with 5 additions and 4 deletions
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9
hw/scsi/virtio-scsi-dataplane.c
View File

@ -107,9 +107,10 @@ static int virtio_scsi_vring_init(VirtIOSCSI *s, VirtQueue *vq, int n,
return 0;
}
/* assumes s->ctx held */
static void virtio_scsi_clear_aio(VirtIOSCSI *s)
/* Context: BH in IOThread */
static void virtio_scsi_dataplane_stop_bh(void *opaque)
{
VirtIOSCSI *s = opaque;
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
int i;
@ -171,7 +172,7 @@ int virtio_scsi_dataplane_start(VirtIODevice *vdev)
return 0;
fail_vrings:
virtio_scsi_clear_aio(s);
aio_wait_bh_oneshot(s->ctx, virtio_scsi_dataplane_stop_bh, s);
aio_context_release(s->ctx);
for (i = 0; i < vs->conf.num_queues + 2; i++) {
virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false);
@ -207,7 +208,7 @@ void virtio_scsi_dataplane_stop(VirtIODevice *vdev)
s->dataplane_stopping = true;
aio_context_acquire(s->ctx);
virtio_scsi_clear_aio(s);
aio_wait_bh_oneshot(s->ctx, virtio_scsi_dataplane_stop_bh, s);
aio_context_release(s->ctx);
blk_drain_all(); /* ensure there are no in-flight requests */