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KVM: arm64: Add kvm_has_nv{2,3}() predicates

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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...).

Reviewed-by: Yuan Yao <yaoyuan@linux.alibaba.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260730071022.296811-19-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>
This commit is contained in:
Marc Zyngier 2026-07-30 08:10:11 +01:00 committed by Oliver Upton
parent 6ec15c963e
commit 3908e30272
1 changed files with 19 additions and 0 deletions
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19
arch/arm64/include/asm/kvm_emulate.h
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@ -266,6 +266,25 @@ 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_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