linux-kernel - Re: [PATCH v2 01/15] virtio_pci: fix virtio spec compliance on restore

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Date:	Tue, 7 Oct 2014 17:35:13 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 01/15] virtio_pci: fix virtio spec compliance on
 restore

On (Mon) 06 Oct 2014 [18:10:40], Michael S. Tsirkin wrote:
> 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@...r.kernel.org
> Cc: Amit Shah <amit.shah@...hat.com>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

I didn't see my previous questions answered from the initial posting
-- can you please respond to them?

		Amit
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