On 30/04/21 11:03, Thomas Gleixner wrote:
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?
NMIs are sent through a different vmexit code (the same one as
exceptions). This one is for interrupts.
Paolo
