From nobody Mon Apr 6 18:28:59 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CD03C4070EE; Wed, 18 Mar 2026 15:56:32 +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=1773849396; cv=none; b=EdZjQKecU44xzdkaT0BTi/hjIrM/iOImwvYkg5A5INSzqE56+0neugt14qSODJsPQBNCfaNZhu3k1wnYKtfn73Dpm2CgXkYVEOlyjyz8yQ+zi9pDYDTHzsG5vHxCO6TaN739RXzgPwmppx1iqqOwcXKaGcJQZT3s1xqTVJuLj9s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773849396; c=relaxed/simple; bh=nwD5+pUYCEmaAYkiT9V7YGERXs3gHR5ON1uhKjnhK1g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hl9V8jvtcSsudgyytt0m897FVtHBZIaAHLWHLhXeZ+zjsDHk3w84fJOY4OGl7REO/ANqYfdDJ++9CZwOTivsKPB26prWPjeNV2xsZDcZ9a367WHJiYt87QvUcxDRzYaF5yc4lLoKh2UAEEpgquVRr+vetLUX888GZVUTId+9tNc= 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 7ACC1201B; Wed, 18 Mar 2026 08:56:26 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.61.122]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 333BE3F73B; Wed, 18 Mar 2026 08:56:29 -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 v13 35/48] arm64: RMI: Allow checking SVE on VM instance Date: Wed, 18 Mar 2026 15:53:59 +0000 Message-ID: <20260318155413.793430-36-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260318155413.793430-1-steven.price@arm.com> References: <20260318155413.793430-1-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 --- Changes since v10: * RME->RMI renaming. * Adapt to move CAP check to kvm_realm_ext_allowed(). --- arch/arm64/include/asm/kvm_rmi.h | 2 ++ arch/arm64/kvm/arm.c | 2 ++ arch/arm64/kvm/rmi.c | 5 +++++ 3 files changed, 9 insertions(+) diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_= rmi.h index 1ee5ed0f5ab2..d6cf87de099b 100644 --- a/arch/arm64/include/asm/kvm_rmi.h +++ b/arch/arm64/include/asm/kvm_rmi.h @@ -87,6 +87,8 @@ struct realm_rec { void kvm_init_rmi(void); u32 kvm_realm_ipa_limit(void); =20 +bool kvm_rmi_supports_sve(void); + int kvm_init_realm_vm(struct kvm *kvm); int kvm_activate_realm(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 7d92ddb06460..3e6f1e810921 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -388,6 +388,8 @@ static bool kvm_realm_ext_allowed(long ext) case KVM_CAP_ARM_PTRAUTH_GENERIC: case KVM_CAP_ARM_RMI: return true; + case KVM_CAP_ARM_SVE: + return kvm_rmi_supports_sve(); } return false; } diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index e56c8af2ad61..7cc6dc14d325 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -33,6 +33,11 @@ static bool rmi_has_feature(unsigned long feature) return !!u64_get_bits(rmm_feat_reg0, feature); } =20 +bool kvm_rmi_supports_sve(void) +{ + return rmi_has_feature(RMI_FEATURE_REGISTER_0_SVE); +} + static int rmi_check_version(void) { struct arm_smccc_res res; --=20 2.43.0