linux-kernel - Re: [PATCH V1 3/6] xen/virtio: Add option to restrict memory access under Xen

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Date:   Sat, 23 Apr 2022 11:10:07 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Oleksandr <olekstysh@...il.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Julien Grall <julien@....org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH V1 3/6] xen/virtio: Add option to restrict memory access
 under Xen

On 23.04.22 09:05, Oleksandr wrote:
> 
> On 23.04.22 02:00, Stefano Stabellini wrote:
> 
> Hello Stefano
> 
> 
>> On Fri, 22 Apr 2022, Oleksandr Tyshchenko wrote:
>>> From: Juergen Gross <jgross@...e.com>
>>>
>>> Introduce Xen grant DMA-mapping layer which contains special DMA-mapping
>>> routines for providing grant references as DMA addresses to be used by
>>> frontends (e.g. virtio) in Xen guests.
>>>
>>> In order to support virtio in Xen guests add a config option XEN_VIRTIO
>>> enabling the user to specify whether in all Xen guests virtio should
>>> be able to access memory via Xen grant mappings only on the host side.
>>>
>>> As this also requires providing arch_has_restricted_virtio_memory_access
>>> implementation, switch from a pure stub to a real function on Arm
>>> and combine with existing implementation for the SEV guests on x86.
>>>
>>> Add the needed functionality by providing a special set of DMA ops
>>> handling the needed grant operations for the I/O pages.
>>>
>>> Signed-off-by: Juergen Gross <jgross@...e.com>
>>> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
>> There are a couple of minor things that checkpatch.pl reports,
> 
> Thank you for pointing this out, my fault.
> 
> 
>>   but aside
>> from those the patch looks fine to me.
> 
> good
> 
> 
> The attached diff to be squashed for the new version. One thing remains:
> 
> checkpatch.pl says regarding drivers/xen/grant-dma-ops.c:
> 
> WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
> #151:
> new file mode 100644
> 
> 
> Which, I assume, this is not an issue as new file falls under XEN HYPERVISOR 
> INTERFACE maintainership?

Yes.


Juergen

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