diff mbox series

[v8,61/69] KVM: arm64: Add FEAT_NV2 cpu feature

Message ID 20230131092504.2880505-62-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: ARMv8.3/8.4 Nested Virtualization support | expand

Commit Message

Marc Zyngier Jan. 31, 2023, 9:24 a.m. UTC
Add the detection code for the FEAT_NV2 feature.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_nested.h |  6 ++++++
 arch/arm64/kernel/cpufeature.c      | 11 +++++++++++
 2 files changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h
index 5dd6b12b6ec0..86e89ace1746 100644
--- a/arch/arm64/include/asm/kvm_nested.h
+++ b/arch/arm64/include/asm/kvm_nested.h
@@ -14,6 +14,12 @@  static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
 		test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features));
 }
 
+static inline bool vcpu_has_nv2(const struct kvm_vcpu *vcpu)
+{
+	return cpus_have_final_cap(ARM64_HAS_ENHANCED_NESTED_VIRT) &&
+		vcpu_has_nv(vcpu);
+}
+
 /* Translation helpers from non-VHE EL2 to EL1 */
 static inline u64 tcr_el2_ps_to_tcr_el1_ips(u64 tcr_el2)
 {
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 3fc14ee86239..49e632aa1756 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2240,6 +2240,17 @@  static const struct arm64_cpu_capabilities arm64_features[] = {
 		.field_width = 4,
 		.min_field_value = ID_AA64MMFR2_EL1_NV_IMP,
 	},
+	{
+		.desc = "Enhanced Nested Virtualization Support",
+		.capability = ARM64_HAS_ENHANCED_NESTED_VIRT,
+		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.matches = has_nested_virt_support,
+		.sys_reg = SYS_ID_AA64MMFR2_EL1,
+		.sign = FTR_UNSIGNED,
+		.field_pos = ID_AA64MMFR2_EL1_NV_SHIFT,
+		.field_width = 4,
+		.min_field_value = ID_AA64MMFR2_EL1_NV_NV2,
+	},
 	{
 		.capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE,
 		.type = ARM64_CPUCAP_SYSTEM_FEATURE,