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Re: [PATCH v2 5/7] xen/arm: Use sanitize values for p2m

On 23/08/2021 12:47, Julien Grall wrote:
Hi Bertrand,

On 23/08/2021 11:32, Bertrand Marquis wrote:
Replace the code in p2m trying to find a sane value for the VMID size
supported and the PAR to use. We are now using the boot cpuinfo as the
values there are sanitized during boot and the value for those
parameters is now the safest possible value on the system.

On arm32, the system will panic if there are different types of core so
those checks were not needed anyway.

So the assumption is that if you have the same MIDR, then you must have the same features. I understand this is what Xen assumes today but I never viewed that check as the truth. It is more to limit the damage on most platform.

So can you confirm whether this is something that Arm guarantees?

That said, I am not against removing the code. But I would like the comment to be amended if this is not a correct assumption.

s/comment/commit message/.


Julien Grall



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