[PATCH v2 18/28] KVM: arm64: Add kvm_has_nv{2,3}() predicates
From: Marc Zyngier <maz@kernel.org>
Date: 2026-07-14 09:16:52
Also in:
kvm, kvmarm
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
Add a new set of predicates indicating whether VM is capable of NV2, NV3, and is in a nested NV3 context. This is going to become useful as we start dealing with a mix of behaviours (NV2, NV3, NV2 on NV3...). Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/kvm_emulate.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 9831166695186..c562d8171d5e1 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h@@ -266,6 +266,26 @@ static inline bool vserror_state_is_nested(struct kvm_vcpu *vcpu) (__vcpu_sys_reg(vcpu, HCRX_EL2) & HCRX_EL2_TMEA); } +static inline bool kvm_has_nv2(struct kvm *kvm) +{ + return (cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) && + kvm_has_feat(kvm, ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY)); +} + +static inline bool kvm_has_nv3(struct kvm *kvm) +{ + return (cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) && + cpus_have_final_cap(ARM64_HAS_NV3) && + kvm_has_feat(kvm, ID_AA64MMFR4_EL1, NV_frac, NV3)); +} + +static inline bool is_nested_nv3_ctxt(struct kvm_vcpu *vcpu) +{ + return (has_vhe() && kvm_has_nv3(vcpu->kvm) && is_nested_ctxt(vcpu) && + (__vcpu_sys_reg(vcpu, HCR_EL2) & HCR_EL2_NV) && + (__vcpu_sys_reg(vcpu, HCRX_EL2) & HCRX_EL2_NVTGE)); +} + /* * The layout of SPSR for an AArch32 state is different when observed from an * AArch64 SPSR_ELx or an AArch32 SPSR_*. This function generates the AArch32
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2.47.3