linux-kernel - Re: [PATCH RFC] virtio-spec: flexible configuration layout

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Message-ID: <1320836793.3259.151.camel@hornet.cambridge.arm.com>
Date:	Wed, 09 Nov 2011 11:06:33 +0000
From:	Pawel Moll <pawel.moll@....com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Amit Shah <amit.shah@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Krishna Kumar <krkumar2@...ibm.com>,
	Wang Sheng-Hui <shhuiw@...il.com>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"avi@...hat.com" <avi@...hat.com>,
	Peter Maydell <peter.maydell@...aro.org>
Subject: Re: [PATCH RFC] virtio-spec: flexible configuration layout

On Wed, 2011-11-09 at 10:55 +0000, Sasha Levin wrote:
> On Wed, 2011-11-09 at 10:47 +0000, Pawel Moll wrote:
> > Yep, it's actually already in 3.2-rc1 (drivers/virtio/virtio_mmio.c) and
> > in the spec (see Appendix X). And actually the control registers layout
> > I used was originally based on the PCI "legacy" headers (slightly
> > simplified), but evolved a bit since. My understanding is that the
> > changes Michael is proposing affect the PCI device interface only so
> > they shouldn't affect "my" interface.
> 
> I didn't know it's in already, might be interesting adding support to it
> to x86 userspace tools.

Do you mean the qemu or the (non-qemu) KVM tools I know nothing
about? ;-)

If qemu, Peter got it already running with virtio_mmio on ARM models
(not upstream yet as far as I know), but I presume the code would we
mostly non-ARM specific.

Cheers!

Pawel


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