linux-kernel - [PATCH v6 28/43] arm64: rme: Allow checking SVE on VM instance

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Message-ID: <20241212155610.76522-29-steven.price@arm.com>
Date: Thu, 12 Dec 2024 15:55:53 +0000
From: Steven Price <steven.price@....com>
To: kvm@...r.kernel.org,
	kvmarm@...ts.linux.dev
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Zenghui Yu <yuzenghui@...wei.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Joey Gouly <joey.gouly@....com>,
	Alexandru Elisei <alexandru.elisei@....com>,
	Christoffer Dall <christoffer.dall@....com>,
	Fuad Tabba <tabba@...gle.com>,
	linux-coco@...ts.linux.dev,
	Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
	Gavin Shan <gshan@...hat.com>,
	Shanker Donthineni <sdonthineni@...dia.com>,
	Alper Gun <alpergun@...gle.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Steven Price <steven.price@....com>
Subject: [PATCH v6 28/43] arm64: rme: Allow checking SVE on VM instance

From: Suzuki K Poulose <suzuki.poulose@....com>

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 <suzuki.poulose@....com>
Signed-off-by: Steven Price <steven.price@....com>
---
 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 90a4537ad38d..0d89ab1645c1 100644
--- a/arch/arm64/include/asm/kvm_rme.h
+++ b/arch/arm64/include/asm/kvm_rme.h
@@ -85,6 +85,8 @@ 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 134acb4ee26f..6f7f96ab781d 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -456,7 +456,10 @@ 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 5831d379760a..27a479feb907 100644
--- a/arch/arm64/kvm/rme.c
+++ b/arch/arm64/kvm/rme.c
@@ -20,6 +20,11 @@ static bool rme_supports(unsigned long feature)
 	return !!u64_get_bits(rmm_feat_reg0, feature);
 }
 
+bool kvm_rme_supports_sve(void)
+{
+	return rme_supports(RMI_FEATURE_REGISTER_0_SVE_EN);
+}
+
 static int rmi_check_version(void)
 {
 	struct arm_smccc_res res;
-- 
2.43.0