linux-kernel - Re: [PATCH v8 38/43] arm64: RME: Configure max SVE vector length for a Realm

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Message-ID: <87f40de1-dd3b-43e2-aa67-8d7b6288acf8@redhat.com>
Date: Thu, 1 May 2025 13:50:31 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>,
 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>
Subject: Re: [PATCH v8 38/43] arm64: RME: Configure max SVE vector length for
 a Realm

On 4/16/25 11:42 PM, Steven Price wrote:
> From: Jean-Philippe Brucker <jean-philippe@...aro.org>
> 
> Obtain the max vector length configured by userspace on the vCPUs, and
> write it into the Realm parameters. By default the vCPU is configured
> with the max vector length reported by RMM, and userspace can reduce it
> with a write to KVM_REG_ARM64_SVE_VLS.
> 
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v6:
>   * Rename max_vl/realm_max_vl to vl/last_vl - there is nothing "maximum"
>     about them, we're just checking that all realms have the same vector
>     length
> ---
>   arch/arm64/kvm/guest.c |  3 ++-
>   arch/arm64/kvm/rme.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 44 insertions(+), 1 deletion(-)
> 

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