tree 1ecd1a445ec24aee7a9d3d013ff4257f7ba2753b
parent cd7fdfe59f4f965665dcd9868fe3764f5256d6aa
author Stefan Hajnoczi <stefanha@redhat.com> 1358437614 +0100
committer Stefan Hajnoczi <stefanha@redhat.com> 1358524760 +0100

dataplane: support viostor virtio-pci status bit setting

The viostor virtio-blk driver for Windows does not use the
VIRTIO_CONFIG_S_DRIVER bit.  It only sets the VIRTIO_CONFIG_S_DRIVER_OK
bit.

The viostor driver refreshes the virtio-pci status byte sometimes while
the guest is running.  We misinterpret 0x4 (VIRTIO_CONFIG_S_DRIVER_OK)
as an indication that virtio-blk-data-plane should be stopped since 0x2
(VIRTIO_CONFIG_S_DRIVER) is missing.  The result is that the device
becomes unresponsive.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>