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Re: [PATCH v2 02/23] xen/arm: smmuv3: Add support for stage-1 and nested stage translation
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Milan Djokic <milan_djokic@xxxxxxxx>
- Date: Fri, 19 Jun 2026 16:05:42 +0200
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- Cc: Rahul Singh <rahul.singh@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Fri, 19 Jun 2026 14:06:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Julien,
On 6/16/26 22:08, Julien Grall wrote:
Hi Milan,
On 23/03/2026 22:51, Milan Djokic wrote:
From: Rahul Singh <rahul.singh@xxxxxxx>
Xen SMMUv3 driver only supports stage-2 translation. Add support for
Stage-1 translation that is required to support nested stage
translation.
In true nested mode, both s1_cfg and s2_cfg will coexist.
Let's remove the union. When nested stage translation is setup, both
s1_cfg and s2_cfg are valid.
I am not entirely sure where to comment. Looking at Linux [1], it seems
some SMMU variant have errata for the nesting mode. Should we at least
prevent nested on both variant for now?
Yes, that makes sense. I will do so.
Cheers,
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0bfbfc526c70606bf0fad302e4821087cbecfaf4
BR,
Milan
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