From patchwork Wed Apr 16 13:41:50 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 14053994 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 65E251B6D06; Wed, 16 Apr 2025 13:45:41 +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=1744811142; cv=none; b=XyPC4RnvBZXVehq7K2qxXnmltoaBLU2S0djh+DjRO4hNGW3oArWHIbIWviQYbvLWDdU8+mBsxjLysSMzo7mqxbuQTVrtS+NnQeJlP/5+JwBbqnzsHb24+VpTMmkg7kNcv+JHn2L5aShdYmMHPB5eXegkbESJwKB5xGxfphntvp0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744811142; c=relaxed/simple; bh=aqmECmQ+wrTHucABMXsLYQiinczJIfkG3f+r7EzrpTU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=b01Gl9pDMT9MFUoKfBeI1G5WpW0LOWd3GEflLt2cXvf0+837J8HTPF//kYHXQpNTecSEkGczU4x3NtnW78skaDy+rrZmPxw/WzzpuMwDoRsuU243d1dM9EMvGt/hlkk2Fv7qV1M3yjM3fYafX2PXL99EioeWkW6yR/yyTYPjIVU= 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 DA4DF1E7D; Wed, 16 Apr 2025 06:45:38 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.90.52]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4FC2D3F59E; Wed, 16 Apr 2025 06:45:36 -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" , Steven Price Subject: [PATCH v8 28/43] arm64: RME: Allow checking SVE on VM instance Date: Wed, 16 Apr 2025 14:41:50 +0100 Message-ID: <20250416134208.383984-29-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250416134208.383984-1-steven.price@arm.com> References: <20250416134208.383984-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 --- 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 7000fa1227d0..f786fd978cf6 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); +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 97c5efbe47a6..850708db660e 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -420,7 +420,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = get_kvm_ipa_limit(); break; case KVM_CAP_ARM_SVE: - r = system_supports_sve(); + if (kvm_is_realm(kvm)) + r = kvm_rme_supports_sve(); + else + r = 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 70244e01c161..a89bd1c29e99 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); } +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;