linux-kernel - Re: [PATCH v9 14/43] KVM: arm64: Support timers in realm RECs

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Message-ID: <5d520f90-f49d-4926-bc04-80979531aa11@redhat.com>
Date: Tue, 1 Jul 2025 16:42:01 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>,
 Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
 <yuzenghui@...wei.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Joey Gouly <joey.gouly@....com>,
 Alexandru Elisei <alexandru.elisei@....com>,
 Christoffer Dall <christoffer.dall@....com>, Fuad Tabba <tabba@...gle.com>,
 linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Shanker Donthineni <sdonthineni@...dia.com>, Alper Gun
 <alpergun@...gle.com>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
 Emi Kisanuki <fj0570is@...itsu.com>
Subject: Re: [PATCH v9 14/43] KVM: arm64: Support timers in realm RECs

On 6/11/25 8:48 PM, Steven Price wrote:
> The RMM keeps track of the timer while the realm REC is running, but on
> exit to the normal world KVM is responsible for handling the timers.
> 
> The RMM doesn't provide a mechanism to set the counter offset, so don't
> expose KVM_CAP_COUNTER_OFFSET for a realm VM.
> 
> A later patch adds the support for propagating the timer values from the
> exit data structure and calling kvm_realm_timers_update().
> 
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v7:
>   * Hide KVM_CAP_COUNTER_OFFSET for realm guests.
> ---
>   arch/arm64/kvm/arch_timer.c  | 48 +++++++++++++++++++++++++++++++++---
>   arch/arm64/kvm/arm.c         |  2 +-
>   include/kvm/arm_arch_timer.h |  2 ++
>   3 files changed, 47 insertions(+), 5 deletions(-)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>