Re: [RFC PATCH v1 2/2] cgroup/misc: Add support for Arm CCA MECIDs

Michal Koutný <[email protected]> Fri, 24 Jul 2026 14:52:19 +0200

Newsgroups	org.kernel.vger.cgroups,dev.linux.lists.kvmarm,dev.linux.lists.linux-coco,org.infradead.lists.linux-arm-kernel,org.kernel.vger.kvm
Message-ID	<[email protected]>

Hello Kohei.

On Fri, Jul 24, 2026 at 06:40:56PM +0900, Kohei Enju <[email protected]> wrote:
> Arm CCA MECIDs are limited platform resources. Add a misc cgroup
> resource to allow the system administrator to account for and limit
> their use.
> 
> The cca_mec resource represents the number of Realm VMs using the
> private MEC policy. Each such Realm consumes one MECID. Charge the
> resource when the Realm is created, and uncharge it when the Realm is
> successfully destroyed.
> 
> Realms using the shared MEC policy don't consume this resource.
> 
> Signed-off-by: Kohei Enju <[email protected]>
> ---
>  arch/arm64/include/asm/kvm_rmi.h |  2 ++
>  arch/arm64/kvm/rmi.c             | 44 +++++++++++++++++++++++++++++++-
>  drivers/firmware/arm_rmm/rmi.c   |  4 +++

(mainly for this)
>  include/linux/misc_cgroup.h      |  4 +++
>  kernel/cgroup/misc.c             |  4 +++
>  5 files changed, 57 insertions(+), 1 deletion(-)

Conditional
Acked-by: Michal Koutný <[email protected]>
(it makes sense along the other arches' miscresurces)

Why? I see this [1] (or followup) needs to be added first.

Thanks,
Michal

[1] https://lore.kernel.org/r/[email protected]/

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