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Re: [PATCH v3 2/2] xen/arm: Restrict Kconfig configuration for LLC coloring
- To: Jan Beulich <jbeulich@xxxxxxxx>, Luca Fancellu <luca.fancellu@xxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Tue, 18 Feb 2025 16:01:11 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 18 Feb 2025 15:01:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18/02/2025 14:44, Jan Beulich wrote:
>
>
> On 18.02.2025 10:51, Luca Fancellu wrote:
>> LLC coloring can be used only on MMU system,
>
> Just for my own education: Why is this?
I read this as it refers to the feature we have in Xen, not the generic concept.
You could in theory achieve cache coloring without MMU using static allocation
or some custom allocator but in general we benefit from being able to map VA
to PA aligning with cache coloring scheme.
P.S. Personally, I've never seen a solution without MMU.
~Michal
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