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

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Message-ID: <CAFEAcA8Ci1_t=qruaAwU_NeR=_WD=7NUsDwqL_qMTyDb4HVBxA@mail.gmail.com>
Date:	Wed, 9 Nov 2011 11:39:44 +0000
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	"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>
Subject: Re: [PATCH RFC] virtio-spec: flexible configuration layout

On 9 November 2011 11:06, Pawel Moll <pawel.moll@....com> wrote:
> 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.

The QEMU code is completely non-ARM-specific (apart from the line
in the relevant ARM board models where we instantiate the devices).
I haven't submitted it upstream yet though because really the
virtio transport layer in QEMU needs to be refactored as a qdev
bus first.

-- PMM
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