From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 005D21DFFC; Tue, 24 Jun 2025 12:50:41 +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=1750769445; cv=none; b=oE9eEVfnRAuoDAtWlcXRP3nWlUeRvKBB63AA0qP0gJZpZrMLBm6qSeBlzvgy0pee07iNfLWIREjYnjd/u8ib0I4IQhc5nXYdmqszaDMIWQPMHMP84jYc0lFCF3smfP+UXBpO8uUfoU8yBj5dxZhg3CIRq1t+r1B3rkPZXhQeh+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750769445; c=relaxed/simple; bh=GyodmIXznG8GSgL/Ai3LAgH/nDuaIi0hljP1HBMPTe4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=di3X5Z+Ufu3AIldNgj+3U5n0oE4uWtLt5GfLjBco8uxWJopUJPkDeWwagkCDJ6GUMKr8zbeGZQ2JBKM5OXdHnxzdZStMwNFl0ZNGVk+kFHbhdsN28uG6t7joYtM/nr+wIQC5PxHGMr738c5FU/alN00U5fNKksxUU02EQGH8Si4= 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 25A03106F; Tue, 24 Jun 2025 05:50:23 -0700 (PDT) Received: from e124191.cambridge.arm.com (e124191.cambridge.arm.com [10.1.197.45]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8D7073F66E; Tue, 24 Jun 2025 05:50:37 -0700 (PDT) Date: Tue, 24 Jun 2025 13:50:32 +0100 From: Joey Gouly To: Steven Price Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, 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, 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 Subject: Re: [PATCH v9 28/43] arm64: RME: Allow checking SVE on VM instance Message-ID: <20250624125032.GA111675@e124191.cambridge.arm.com> References: <20250611104844.245235-1-steven.price@arm.com> <20250611104844.245235-29-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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250611104844.245235-29-steven.price@arm.com> On Wed, Jun 11, 2025 at 11:48:25AM +0100, Steven Price wrote: > 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); > > +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 = 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 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); > } > > +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; > -- > 2.43.0 >