[PATCH v16 36/45] KVM: arm64: CCA: Allow checking SVE on VM instance
From: Steven Price <steven.price@arm.com>
Date: 2026-08-03 13:47:07
Also in:
kvm, kvmarm, linux-arm-kernel, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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> --- 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 0fb685004d5c..13933f0e555d 100644
--- a/arch/arm64/include/asm/kvm_rmi.h
+++ b/arch/arm64/include/asm/kvm_rmi.h@@ -98,6 +98,8 @@ struct realm_rec { void kvm_init_rmi(void); u32 kvm_rmm_ipa_limit(void); +bool kvm_rmi_supports_sve(void); + int kvm_init_realm(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 96e536d2dda8..3242108be7c5 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c@@ -151,6 +151,8 @@ static bool kvm_realm_ext_allowed(long ext) case KVM_CAP_ARM_RMI: case KVM_CAP_SYNC_MMU: 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 904df7c7245d..0d46768022df 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c@@ -26,6 +26,11 @@ static bool rmi_has_feature(int reg, unsigned long feature) return !!u64_get_bits(rmi_feat_reg(reg), feature); } +bool kvm_rmi_supports_sve(void) +{ + return rmi_has_feature(0, RMI_FEATURE_REGISTER_0_SVE); +} + u32 kvm_rmm_ipa_limit(void) { return u64_get_bits(rmi_feat_reg(0), RMI_FEATURE_REGISTER_0_S2SZ);
--
2.43.0