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

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Message-ID: <20141007165439.GB823@grmbl.mre>
Date:	Tue, 7 Oct 2014 22:24:39 +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 (Tue) 07 Oct 2014 [15:53:55], Michael S. Tsirkin wrote:
> On Mon, Oct 06, 2014 at 06:10:40PM +0300, 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.
> 
> Tested suspend to ram with virtio net and blk.

I'd recommend running a continuous ping for virtio-net and a dd
process running across s3/s4 for testing.

That's what I had run while doing the original set of patches.

		Amit
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