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KVM: VMX: Add a helper for NMI handling

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Add a helper to handles NMI exit.

TDX handles the NMI exit the same as VMX case.  Add a helper to share the
code with TDX, expose the helper in common.h.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Co-developed-by: Binbin Wu <binbin.wu@linux.intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250222014757.897978-15-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2025-02-22 09:47:55 +08:00 committed by Paolo Bonzini
parent d5bc91e8e7
commit 7e548b0d90
2 changed files with 17 additions and 9 deletions
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2
arch/x86/kvm/vmx/common.h
View File

@ -177,4 +177,6 @@ static inline void __vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu,
kvm_vcpu_trigger_posted_interrupt(vcpu, POSTED_INTR_VECTOR);
}
noinstr void vmx_handle_nmi(struct kvm_vcpu *vcpu);
#endif /* __KVM_X86_VMX_COMMON_H */

24
arch/x86/kvm/vmx/vmx.c
View File

@ -7214,6 +7214,20 @@ static fastpath_t vmx_exit_handlers_fastpath(struct kvm_vcpu *vcpu,
}
}
noinstr void vmx_handle_nmi(struct kvm_vcpu *vcpu)
{
if ((u16)vmx_get_exit_reason(vcpu).basic != EXIT_REASON_EXCEPTION_NMI ||
!is_nmi(vmx_get_intr_info(vcpu)))
return;
kvm_before_interrupt(vcpu, KVM_HANDLING_NMI);
if (cpu_feature_enabled(X86_FEATURE_FRED))
fred_entry_from_kvm(EVENT_TYPE_NMI, NMI_VECTOR);
else
vmx_do_nmi_irqoff();
kvm_after_interrupt(vcpu);
}
static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu,
unsigned int flags)
{
@ -7257,15 +7271,7 @@ static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu,
if (likely(!vmx_get_exit_reason(vcpu).failed_vmentry))
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
if ((u16)vmx_get_exit_reason(vcpu).basic == EXIT_REASON_EXCEPTION_NMI &&
is_nmi(vmx_get_intr_info(vcpu))) {
kvm_before_interrupt(vcpu, KVM_HANDLING_NMI);
if (cpu_feature_enabled(X86_FEATURE_FRED))
fred_entry_from_kvm(EVENT_TYPE_NMI, NMI_VECTOR);
else
vmx_do_nmi_irqoff();
kvm_after_interrupt(vcpu);
}
vmx_handle_nmi(vcpu);
out:
guest_state_exit_irqoff();