From nobody Sun Sep 14 03:54:57 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0CCD434AB14; Wed, 20 Aug 2025 14:59:31 +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=1755701972; cv=none; b=CCtYy6Ysf8xZ+vPRxtM1RLfJg+bBBviBMy4ezBAAmJXAYCkJZG9FkRUKy/sxzDt5chglgKNRZPqfdGWQNtOVz4g1QLgGwzEeMfDjyeD/NoK8vTMIGDiZG7tAyJQ4HnUg7AuFRkAt+vVZ3thKDC34c6d8xU1Xr835F8z3ntFd8k8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755701972; c=relaxed/simple; bh=HUvO3BJiXRZDPbYAdPO2URBrOA8N5gQsfJ695Wb8/zM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LWYRppfhC/HVFLVyBW35Khn21OUVhkE6QQSHT/6rcaRmHVK/Hxrsu3MFMM8ccQ+116aPImJIMccn7ih2ikCNQ9froNy43WDL3oOP6GO5h0w7yBoGCJF1z8Fg324d4xHwyaRRg9Dx2B6yBqY9290+GGGoeUE/A2xsC1/eYr8RdC4= 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 758F42C27; Wed, 20 Aug 2025 07:59:22 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.2.58]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F3CAC3F738; Wed, 20 Aug 2025 07:59:25 -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 , Vishal Annapurve , Steven Price Subject: [PATCH v10 28/43] arm64: RME: Allow checking SVE on VM instance Date: Wed, 20 Aug 2025 15:55:48 +0100 Message-ID: <20250820145606.180644-29-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250820145606.180644-1-steven.price@arm.com> References: <20250820145606.180644-1-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 7a4c82701e67..1490f57f3e14 100644 --- a/arch/arm64/include/asm/kvm_rme.h +++ b/arch/arm64/include/asm/kvm_rme.h @@ -90,6 +90,8 @@ 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 4a5d97b4e7d0..0fc76751c034 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -427,7 +427,10 @@ 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 71fb1e68f88d..4f52bb20c873 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