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virtio-net: don't touch virtqueue if vm is stopped

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Guest state should not be touched if VM is stopped, unfortunately we
didn't check running state and tried to drain tx queue unconditionally
in virtio_net_set_status(). A crash was then noticed as a migration
destination when user type quit after virtqueue state is loaded but
before region cache is initialized. In this case,
virtio_net_drop_tx_queue_data() tries to access the uninitialized
region cache.

Fix this by only dropping tx queue data when vm is running.

Fixes: 283e2c2adc ("net: virtio-net discards TX data after link down")
Cc: Yuri Benditovich <yuri.benditovich@daynix.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2017-11-22 17:57:19 +08:00
parent 5e19aed59a
commit 70e53e6e4d
1 changed files with 2 additions and 1 deletions
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3
hw/net/virtio-net.c
View file

@ -288,7 +288,8 @@ static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
qemu_bh_cancel(q->tx_bh);
}
if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
(queue_status & VIRTIO_CONFIG_S_DRIVER_OK)) {
(queue_status & VIRTIO_CONFIG_S_DRIVER_OK) &&
vdev->vm_running) {
/* if tx is waiting we are likely have some packets in tx queue
* and disabled notification */
q->tx_waiting = 0;