Re: [PATCH v9 28/43] arm64: RME: Allow checking SVE on VM instance
From: Joey Gouly <joey.gouly@arm.com>
Date: 2025-06-24 12:50:41
Also in:
kvm, kvmarm, linux-coco, lkml
On Wed, Jun 11, 2025 at 11:48:25AM +0100, Steven Price wrote:
From: Suzuki K Poulose <suzuki.poulose@arm.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@arm.com> Signed-off-by: Steven Price <steven.price@arm.com> Reviewed-by: Gavin Shan <redacted>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
quoted hunk ↗ jump to hunk
--- 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