Re: arm64: MPAM2_EL2 and MPAMHCR_EL2 are left UNKNOWN under arm64.nompam

[Bradley Morgan]

On 2 September 2026 16:31:02 BST, Fuad Tabba <fuad.tabba@xxxxxxxxx> wrote:
>On Wed, 2 Sept 2026 at 16:29, Bradley Morgan <brads@xxxxxxxxxxxxxx> wrote:
>>
>> On 2 September 2026 16:26:55 BST, Xi Ruoyao <xry111@xxxxxxxxxxx> wrote:
>> >On Thu, 2026-08-27 at 09:41 +0100, Ben Horgan wrote:
>> >> > not, could the caveat go the other way round: arm64.nompam is for
>> >> > systems where firmware ignores MPAM, and should only be set on a
>> >> > machine that does not boot without it?
>> >>
>> >> Yes, seems fine.
>> >
>> >Sorry for the late reply.  This is indeed the original purpose for
>> >arm64.nompam, a dirty hack when we have no other ways to make the
>system
>> >boot.  If you think it causes an inconsistent state I'd not complain
>> >against adding a loud warning or something.
>>
>> Sorry to impede in the discussion, would you like me to submit a patch
>for
>> that?
>
>No, thanks. It's written already in the form Ben suggested. Will send it
>soon.
>
>/fuad
>
>>
>> >
>> >
>>
>> --- Thanks!
>>
>https://lore.kernel.org/all/EE579805-42F2-4C58-B752-F28779EEB717@xxxxxxxxx/
Ok, could you cc me in it?
--- Thanks!
https://lore.kernel.org/all/EE579805-42F2-4C58-B752-F28779EEB717@xxxxxxxxx/