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Re: [PATCH] SUPPORT.MD: Clarify the support state for the Arm SMMUv{1, 2} drivers
- To: Julien Grall <julien@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 23 Sep 2020 13:55:26 +0000
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- Cc: "open list:X86" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
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- Thread-topic: [PATCH] SUPPORT.MD: Clarify the support state for the Arm SMMUv{1, 2} drivers
> On 23 Sep 2020, at 12:17, Julien Grall <julien@xxxxxxx> wrote:
>
>
>
> On 23/09/2020 11:50, Bertrand Marquis wrote:
>> Hi,
>>> On 23 Sep 2020, at 09:28, Julien Grall <julien@xxxxxxx> wrote:
>>>
>>> From: Julien Grall <jgrall@xxxxxxxxxx>
>>>
>>> SMMUv{1, 2} are both marked as security supported, so we would
>>> technically have to issue an XSA for any IOMMU security bug.
>>>
>>> However, at the moment, device passthrough is not security supported
>>> on Arm and there is no plan to change that in the next few months.
>>>
>>> Therefore, mark Arm SMMUv{1, 2} as supported but not security supported.
>>>
>>> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
>> Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
>
> Thanks!
>
>> We will publish in the next week a first implementation of SMMUv3 support
>> which might make sense to have fully Supported.
>
> I am not sure whether you include security supported in your "fully supported"
If we something is missing we will be happy to fix it to reach this goal.
>
> However, I would consider to follow the same model as we did with the IPMMU.
> The driver would first be marked as a technical preview to allow more testing
> in the community.
I was not meaning to have this at the very beginning.
More that it make more sense in general to have SMMUv3 with 2 level of page
table supporting this then old SMMU versions.
Cheers
Bertrand
>
> Cheers,
>
> --
> Julien Grall
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