This reverts commit aff8fd18f1.
Both virtio-net and virtio-crypto do not balance
virtio_queue_set_notification() enable and disable calls. This makes
the notifications_disabled counter unreliable and Doug Goldstein
reported the following assertion failure:
#3 0x00007ffff44d1c62 in __GI___assert_fail (
assertion=assertion@entry=0x555555ae8e8a "vq->notification_disabled > 0",
file=file@entry=0x555555ae89c0 "/home/doug/work/qemu/hw/virtio/virtio.c",
line=line@entry=215,
function=function@entry=0x555555ae9630 <__PRETTY_FUNCTION__.43707>
"virtio_queue_set_notification") at assert.c:101
#4 0x00005555557f25d6 in virtio_queue_set_notification (vq=0x55555666aa90,
enable=enable@entry=1) at /home/doug/work/qemu/hw/virtio/virtio.c:215
#5 0x00005555557dc311 in virtio_net_has_buffers (q=<optimized out>,
q=<optimized out>, bufsize=102)
at /home/doug/work/qemu/hw/net/virtio-net.c:1008
#6 virtio_net_receive (nc=<optimized out>, buf=0x555557386b88 "", size=102)
at /home/doug/work/qemu/hw/net/virtio-net.c:1148
#7 0x00005555559cad33 in nc_sendv_compat (flags=<optimized out>, iovcnt=1,
iov=0x7fffead746d0, nc=0x55555788b340) at net/net.c:705
#8 qemu_deliver_packet_iov (sender=<optimized out>, flags=<optimized out>,
iov=0x7fffead746d0, iovcnt=1, opaque=0x55555788b340) at net/net.c:732
#9 0x00005555559cd929 in qemu_net_queue_deliver (size=<optimized out>,
data=<optimized out>, flags=<optimized out>, sender=<optimized out>,
queue=0x55555788b550) at net/queue.c:164
#10 qemu_net_queue_flush (queue=0x55555788b550) at net/queue.c:261
This patch is safe to revert since it's just an optimization for
virtqueue polling. The next patch will improve the situation again
without resorting to nesting.
Reported-by: Doug Goldstein <cardoe@cardoe.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Richard Henderson <rth@twiddle.net>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
332fa82d09