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Re: [PATCH v3 2/6] xen/arm: mpu: Introduce choice between MMU and MPU





On 14/10/2024 19:43, Luca Fancellu wrote:
Hi Ayan,

On 10 Oct 2024, at 15:03, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx> wrote:

There are features in the forthcoming patches which are dependent on
MPU. For eg fixed start address.
Also, some of the Xen features (eg STATIC_MEMORY) will be selected
by the MPU configuration.

Thus, this patch introduces a choice between MMU and MPU for the type
of memory management system. By default, MMU is selected.
MPU is now gated by UNSUPPORTED.

Update SUPPORT.md to state that the support for MPU is experimental.

Maybe I’m wrong, but shouldn’t we add this only when MPU is supported?

The support of the MPU will happen quite a long way down the line. We will first start with experimental (which implies the code may or may not work) and I think this is correct to do that now.

Cheers,

--
Julien Grall




 


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