Add the detection code for the ARMv8.4-NV feature.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_nested.h | 6 ++++++
arch/arm64/kernel/cpufeature.c | 10 ++++++++++
arch/arm64/tools/cpucaps | 1 +
3 files changed, 17 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h
index 76fbf5de1f2c..7fb7ae97ed88 100644
--- a/arch/arm64/include/asm/kvm_nested.h
+++ b/arch/arm64/include/asm/kvm_nested.h
@@ -14,6 +14,12 @@ static inline bool nested_virt_in_use(const struct kvm_vcpu *vcpu)
test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features));
}
+static inline bool enhanced_nested_virt_in_use(const struct kvm_vcpu *vcpu)
+{
+ return cpus_have_final_cap(ARM64_HAS_ENHANCED_NESTED_VIRT) &&
+ nested_virt_in_use(vcpu);
+}
+
/* Translation helpers from non-VHE EL2 to EL1 */
static inline u64 tcr_el2_ips_to_tcr_el1_ps(u64 tcr_el2)
{
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 4d57e98cdde5..0c83f4b38ed8 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2018,6 +2018,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.field_pos = ID_AA64MMFR2_NV_SHIFT,
.min_field_value = 1,
},
+ {
+ .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_NV_SHIFT,
+ .min_field_value = 2,
+ },
{
.capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index a49864b56a07..3f6f567d2811 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -19,6 +19,7 @@ HAS_DCPODP
HAS_DCPOP
HAS_E0PD
HAS_ECV
+HAS_ENHANCED_NESTED_VIRT
HAS_EPAN
HAS_GENERIC_AUTH
HAS_GENERIC_AUTH_ARCH
--
2.30.2
