[PATCH v2 22/28] KVM: arm64: Add routing for NVHCR_EL2 trap
From: Marc Zyngier <maz@kernel.org>
Date: 2026-07-14 09:16:53
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
NVHCR_EL2 accesses from EL1 are taken to EL2 when HCRX_EL2.NVTGE==0 and HCR_EL2.NV==1. Describe this in the exception routing tables. Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/kvm/emulate-nested.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index b7f3d86a94031..625604019fb32 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c@@ -136,6 +136,8 @@ enum cgt_group_id { CGT_CPTR_TTA, CGT_MDCR_HPMN, + CGT_HCR_NV_HCRX_nNVTGE, + /* Must be last */ __NR_CGT_GROUP_IDS__ };
@@ -588,6 +590,15 @@ static enum trap_behaviour check_mdcr_hpmn(struct kvm_vcpu *vcpu) return BEHAVE_HANDLE_LOCALLY; } +static enum trap_behaviour check_hcr_nv_hcrx_nnvtge(struct kvm_vcpu *vcpu) +{ + if ((__vcpu_sys_reg(vcpu, HCR_EL2) & HCR_EL2_NV) && + !(__vcpu_sys_reg(vcpu, HCRX_EL2) & HCRX_EL2_NVTGE)) + return BEHAVE_FORWARD_RW; + + return BEHAVE_HANDLE_LOCALLY; +} + #define CCC(id, fn) \ [id - __COMPLEX_CONDITIONS__] = fn
@@ -598,6 +609,7 @@ static const complex_condition_check ccc[] = { CCC(CGT_CNTHCTL_EL1NVVCT, check_cnthctl_el1nvvct), CCC(CGT_CPTR_TTA, check_cptr_tta), CCC(CGT_MDCR_HPMN, check_mdcr_hpmn), + CCC(CGT_HCR_NV_HCRX_nNVTGE, check_hcr_nv_hcrx_nnvtge), }; /*
@@ -853,6 +865,7 @@ static const struct encoding_to_trap_config encoding_to_cgt[] __initconst = { SR_TRAP(SYS_SCTLR2_EL2, CGT_HCR_NV), SR_RANGE_TRAP(SYS_HCR_EL2, SYS_HCRX_EL2, CGT_HCR_NV), + SR_TRAP(SYS_NVHCR_EL2, CGT_HCR_NV_HCRX_nNVTGE), SR_TRAP(SYS_SMPRIMAP_EL2, CGT_HCR_NV), SR_TRAP(SYS_SMCR_EL2, CGT_HCR_NV), SR_RANGE_TRAP(SYS_TTBR0_EL2,
--
2.47.3