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Re: [PATCH v10 02/12] xen/arm: add initial support for LLC coloring on arm64
- To: Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 28 Nov 2024 11:42:31 +0100
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- Cc: andrea.bastoni@xxxxxxxxxxxxxxx, marco.solieri@xxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 28 Nov 2024 10:42:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.11.2024 15:13, Carlo Nonato wrote:
> LLC coloring needs to know the last level cache layout in order to make the
> best use of it. This can be probed by inspecting the CLIDR_EL1 register,
> so the Last Level is defined as the last level visible by this register.
> Note that this excludes system caches in some platforms.
>
> Static memory allocation and cache coloring are incompatible because static
> memory can't be guaranteed to use only colors assigned to the domain.
> Panic during DomUs creation when both are enabled.
>
> Based on original work from: Luca Miccio <lucmiccio@xxxxxxxxx>
>
> Signed-off-by: Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>
> Signed-off-by: Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
(As this is inapplicable to Arm code, it's independent of Michal's comments.)
Jan
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