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virtio-blk: Add blk_drain() to virtio_blk_device_unrealize()

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QEMU does not wait for completed I/O requests, assuming that the guest
driver will reset the device before calling unrealize(). This does not
happen on Windows, and QEMU crashes in virtio_notify(), getting the
result of a completed I/O request on hot-unplugged device.

Signed-off-by: Julia Suvorova <jusual@redhat.com>
Message-Id: <20191018142856.31870-1-jusual@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Julia Suvorova 2019-10-18 16:28:56 +02:00 committed by Stefan Hajnoczi
parent 58560ad254
commit 7bfde688fb
1 changed files with 1 additions and 0 deletions
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hw/block/virtio-blk.c
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@ -1207,6 +1207,7 @@ static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp)
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOBlock *s = VIRTIO_BLK(dev);
blk_drain(s->blk);
virtio_blk_data_plane_destroy(s->dataplane);
s->dataplane = NULL;
qemu_del_vm_change_state_handler(s->change);