Re: [PATCH v3 2/2] xen/arm: Restrict Kconfig configuration for LLC coloring

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 4 Mar 2025, Luca Fancellu wrote:
> Hi,
> 
> > On 18 Feb 2025, at 15:06, Jan Beulich <jbeulich@xxxxxxxx> wrote:
> > 
> > On 18.02.2025 16:01, Orzel, Michal wrote:
> >> 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.
> > 
> > Oh, okay. Then maybe the sentence would better be worded to express that
> > it's our present choice, rather than an inherent limitation?
> 
> Is this better? Can be addressed on commit?
> 
> Xen LLC coloring feature can be used only on MMU system, move the code
> that selects it from ARM_64 to MMU and add the ARM_64 dependency.

Hi Luca, I think that's OK. Can this patch be committed without the
previous patch in the series?