From: Michael S. Tsirkin <mst@redhat.com>
Date: Tue, 14 Oct 2014 00:10:29 +0000 (+1030)
Subject: virtio_pci: fix virtio spec compliance on restore
X-Git-Tag: fixes-against-v3.18-rc2~57^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fbc198cf623944ab60a1db6d306a4d55cdd820d;p=pandora-kernel.git

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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