From nobody Sat Oct 11 08:18:37 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4A0932749E9; Wed, 11 Jun 2025 10:50:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749639047; cv=none; b=NFIy0mCbPomII/PhMD3djCFATkxvOko4ckLVXXRiwZDMVSEWFm+Rw2LkBs9Bs1zvc7kNpJtbpg1xHR0T1ZioSNGiE09PNckdHLf2jpScfx0l9XGyTST8gzxkEi8NCBOnkMXlHIZoCcmlCdbQZIYiEYACpp0GThouTlNWw5AKA0c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749639047; c=relaxed/simple; bh=M714u42u99a2KKumu5RtFSysJYHvKrNdmTtwgZYCtYM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lQMCdcbnR3RK7JkIZ6QWvKIFTppg7l9SidxkqINva0Q9xxEKMbNO40Zbr6Qn34IKRa+EXi8kkcsmgL5b4N6LKhUXDyszup1D1j+KRZJc2KHW+0s2fQxIcP5dfERd8spS5b4G4fpHsQzl4hIeRYATt7KMUR0wLyZnDuyuwYDVzJ8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 52B941BCB; Wed, 11 Jun 2025 03:50:25 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.67.107]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F3EC93F673; Wed, 11 Jun 2025 03:50:40 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Suzuki K Poulose , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , 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 , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Steven Price Subject: [PATCH v9 28/43] arm64: RME: Allow checking SVE on VM instance Date: Wed, 11 Jun 2025 11:48:25 +0100 Message-ID: <20250611104844.245235-29-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250611104844.245235-1-steven.price@arm.com> References: <20250611104844.245235-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Suzuki K Poulose Given we have different types of VMs supported, check the support for SVE for the given instance of the VM to accurately report the status. Signed-off-by: Suzuki K Poulose Signed-off-by: Steven Price Reviewed-by: Gavin Shan Reviewed-by: Joey Gouly --- arch/arm64/include/asm/kvm_rme.h | 2 ++ arch/arm64/kvm/arm.c | 5 ++++- arch/arm64/kvm/rme.c | 5 +++++ 3 files changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_= rme.h index 2d7d7233c525..af5150c084ce 100644 --- a/arch/arm64/include/asm/kvm_rme.h +++ b/arch/arm64/include/asm/kvm_rme.h @@ -94,6 +94,8 @@ void kvm_init_rme(void); u32 kvm_realm_ipa_limit(void); u32 kvm_realm_vgic_nr_lr(void); =20 +bool kvm_rme_supports_sve(void); + int kvm_realm_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap); int kvm_init_realm_vm(struct kvm *kvm); void kvm_destroy_realm(struct kvm *kvm); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 4eb229b6c315..d1ef12fe6176 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -426,7 +426,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long= ext) r =3D get_kvm_ipa_limit(); break; case KVM_CAP_ARM_SVE: - r =3D system_supports_sve(); + if (kvm_is_realm(kvm)) + r =3D kvm_rme_supports_sve(); + else + r =3D system_supports_sve(); break; case KVM_CAP_ARM_PTRAUTH_ADDRESS: case KVM_CAP_ARM_PTRAUTH_GENERIC: diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c index 5f1fdefc0364..6bd21223a8be 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -38,6 +38,11 @@ static bool rme_has_feature(unsigned long feature) return !!u64_get_bits(rmm_feat_reg0, feature); } =20 +bool kvm_rme_supports_sve(void) +{ + return rme_has_feature(RMI_FEATURE_REGISTER_0_SVE_EN); +} + static int rmi_check_version(void) { struct arm_smccc_res res; --=20 2.43.0