Michael S. Tsirkin 6fbc198cf6
virtio_pci: fix virtio spec compliance on restore ...
On restore, virtio pci does the following:
+ set features
+ init vqs etc - device can be used at this point!
+ set ACKNOWLEDGE,DRIVER and DRIVER_OK status bits
This is in violation of the virtio spec, which
requires the following order:
- ACKNOWLEDGE
- DRIVER
- init vqs
- DRIVER_OK
This behaviour will break with hypervisors that assume spec compliant
behaviour. It seems like a good idea to have this patch applied to
stable branches to reduce the support butden for the hypervisors.
Cc: stable@vger.kernel.org
Cc: Amit Shah <amit.shah@redhat.com >
Signed-off-by: Michael S. Tsirkin <mst@redhat.com >
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au >
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