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Re: [PATCH v7 2/3] arm/mpu: Introduce `v8r_el1_msa` device tree property for domains
- To: Luca Fancellu <luca.fancellu@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Wed, 13 May 2026 14:44:26 +0200
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- Cc: Harry Ramsey <harry.ramsey@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Wed, 13 May 2026 12:44:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13-May-26 14:41, Luca Fancellu wrote:
> From: Harry Ramsey <harry.ramsey@xxxxxxx>
>
> Add a new device tree property `v8r_el1_msa` to select the MSA (memory
> system architecture) at EL1 for Armv8-R architecture: MPU or MMU, the
> former is the default if the property is not passed.
>
> Implement the dom0less path to parse the new device tree property, add
> a new domctl hypercall input parameter `v8r_el1_msa` for arm and
> add the sanitisation in arch_sanitise_domain_config(), the parameter
> is intended to be used on CONFIG_MPU systems and returns an error if
> selected for MMU.
>
> While there, add explicit padding and check that it's zero during
> arch domain config sanitisation, given the breaking change, bump the
> XEN_DOMCTL_INTERFACE_VERSION.
>
> Signed-off-by: Harry Ramsey <harry.ramsey@xxxxxxx>
> Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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