linux-kernel - Re: [PATCH] xen: don't require virtio with grants for non-PV guests

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Date:   Wed, 15 Jun 2022 15:46:59 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     xen-devel@...ts.xenproject.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: Re: [PATCH] xen: don't require virtio with grants for non-PV guests

On 15.06.22 15:43, Christoph Hellwig wrote:
> On Wed, Jun 15, 2022 at 02:53:54PM +0200, Juergen Gross wrote:
>> On 15.06.22 13:54, Christoph Hellwig wrote:
>>> On Wed, Jun 15, 2022 at 01:39:01PM +0200, Juergen Gross wrote:
>>>> No, it doesn't. I'm working on a qemu patch series enabling the qemu
>>>> based backends to support grants with virtio. The code is working fine
>>>> on x86, too (apart from the fact that the backends aren't ready yet).
>>>
>>> The code right now in mainline only ever sets the ops for DMA.  So
>>> I can't see how you could make it work.
>>
>> Ah, you are right. I was using a guest with an older version of the series.
>> Sorry for the noise.
> 
> No problem.  But whatever you end up using to enable the grant DMA
> ops n x86 should also require the platform access feature.  We already
> have that information so we can make use of it.

Yes, of course.


Juergen

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