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Wed, 30 Apr 2025 20:50:40 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF+2TUVWiAQRNStfJKlXXyrEy8i+Rkh7KlouLhbtQWVsBfOICdI6sUfx8nwE+QueIaBYA6F7Q== X-Received: by 2002:a05:6a00:2da3:b0:736:a82a:58ad with SMTP id d2e1a72fcca58-7404923a33dmr1298168b3a.15.1746071440658; Wed, 30 Apr 2025 20:50:40 -0700 (PDT) Received: from [192.168.68.51] ([180.233.125.65]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74039a2e5ccsm2541439b3a.110.2025.04.30.20.50.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Apr 2025 20:50:40 -0700 (PDT) Message-ID: <87f40de1-dd3b-43e2-aa67-8d7b6288acf8@redhat.com> Date: Thu, 1 May 2025 13:50:31 +1000 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 38/43] arm64: RME: Configure max SVE vector length for a Realm To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Jean-Philippe Brucker , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20250416134208.383984-1-steven.price@arm.com> <20250416134208.383984-39-steven.price@arm.com> From: Gavin Shan In-Reply-To: <20250416134208.383984-39-steven.price@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: cLeAAI-fsc6fTm3h-1HarXwetxk7a0EL1P5ssW-zjBs_1746071441 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/16/25 11:42 PM, Steven Price wrote: > From: Jean-Philippe Brucker > > 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 > Signed-off-by: Steven Price > --- > 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