Lai,
On Tue, Apr 27 2021 at 07:09, Lai Jiangshan wrote:
> u32 intr_info = vmx_get_intr_info(&vmx->vcpu);
> @@ -6427,12 +6417,19 @@ static void handle_exception_nmi_irqoff(struct vcpu_vmx *vmx)
> static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu)
> {
> u32 intr_info = vmx_get_intr_info(vcpu);
> + unsigned int vector;
> + gate_desc *desc;
>
> if (WARN_ONCE(!is_external_intr(intr_info),
> "KVM: unexpected VM-Exit interrupt info: 0x%x", intr_info))
> return;
>
> - handle_interrupt_nmi_irqoff(vcpu, intr_info);
> + vector = intr_info & INTR_INFO_VECTOR_MASK;
> + desc = (gate_desc *)host_idt_base + vector;
> +
> + kvm_before_interrupt(vcpu);
> + vmx_do_interrupt_nmi_irqoff(gate_offset(desc));
> + kvm_after_interrupt(vcpu);
So the previous patch does:
+ kvm_before_interrupt(&vmx->vcpu);
+ vmx_do_interrupt_nmi_irqoff((unsigned long)asm_noist_exc_nmi);
+ kvm_after_interrupt(&vmx->vcpu);
What is this idt gate descriptor dance for in this code?
Thanks,
tglx
