RE: [PATCH v8 33/33] KVM: x86/vmx: refactor VMX_DO_EVENT_IRQOFF to generate FRED stack frames

[Li, Xin3]

> 
>  	kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ);
> -	vmx_do_interrupt_irqoff(gate_offset(desc));
> +	if (cpu_feature_enabled(X86_FEATURE_FRED))
> +		vmx_do_fred_interrupt_irqoff(vector);
> +	else
> +		vmx_do_interrupt_irqoff(gate_offset((gate_desc *)host_idt_base


external_interrupt() is always available on x86_64, even when CONFIG_X86_FRED
is not defined. I prefer to always call external_interrupt() on x86_64 for IRQ
handling, which avoids re-entering noinstr code. how do you think? Too
aggressive?

Thanks!
  Xin


> +
> +vector));
>  	kvm_after_interrupt(vcpu);