From nobody Wed Dec 17 16:12:52 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6677A354AF0; Wed, 17 Dec 2025 10:14:22 +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=1765966463; cv=none; b=KBAgmWk8q6i5NOHSY02rQtWXkt7mKixGVz+JizzaYkEh2yPbWYn3EnPZNtadrK8kJoSmFxgDTflT3yOcyTccedTTPgVRO8fkOdJIfYAba8Qvaz6fzxmwiE3mTvRESXcWz7CrKsilPBNdBlWI3ijlWcMXaxrWoq2sVZl1oUHhLzY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765966463; c=relaxed/simple; bh=d14954VjBX17v5VO8Xzbjh0DTbfgEJZxH6htT7HNxI4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AjSB5E9UnfjrqrKoNkUTx9pXKjuG/Kp/W3pTdXpmGJC3EOxhpsJN8Ph+2GhvR48bgnFQTvGhVFFsjUiewwKFiZnpY16SPsGfRPkFjsnn/IbNeiZ+6T5E3XypEcYEYX3H98aQrVupVb7U3BVAQLXZ4BA3v87oQFnFGMqILp57QSA= 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 AF2FD1688; Wed, 17 Dec 2025 02:14:14 -0800 (PST) Received: from e122027.arm.com (unknown [10.57.45.201]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5AB873F73B; Wed, 17 Dec 2025 02:14:17 -0800 (PST) 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 v12 32/46] arm64: RMI: Allow checking SVE on VM instance Date: Wed, 17 Dec 2025 10:11:09 +0000 Message-ID: <20251217101125.91098-33-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251217101125.91098-1-steven.price@arm.com> References: <20251217101125.91098-1-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 | 10 ++++++++++ 3 files changed, 14 insertions(+) diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_= rmi.h index 77da297ca09d..82280c138935 100644 --- a/arch/arm64/include/asm/kvm_rmi.h +++ b/arch/arm64/include/asm/kvm_rmi.h @@ -89,6 +89,8 @@ void kvm_init_rmi(void); u32 kvm_realm_ipa_limit(void); u32 kvm_realm_vgic_nr_lr(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 403f9119543e..f8255de92902 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -342,6 +342,8 @@ 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 5f50566c701d..7ef5d7f48d0b 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -33,6 +33,16 @@ static inline unsigned long rmi_rtt_level_mapsize(int le= vel) return (1UL << RMM_RTT_LEVEL_SHIFT(level)); } =20 +static bool rmi_has_feature(unsigned long feature) +{ + return !!u64_get_bits(rmm_feat_reg0, feature); +} + +bool kvm_rmi_supports_sve(void) +{ + return rmi_has_feature(RMI_FEATURE_REGISTER_0_SVE_EN); +} + static int rmi_check_version(void) { struct arm_smccc_res res; --=20 2.43.0