handle_exception: nmi was ignored in vmx-exit handler function,cause
it has been dealt in vmx_vcpu_run before.
4222 static int handle_exception(struct kvm_vcpu *vcpu)
....
4246
4247 if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
4248 return 1; /* already handled by vmx_vcpu_run() */**
vmx_vcpu_run:this function will launch the vmx virtual pc,and the last
three lines handle the vmx_exit,so they are actuall in vmx host
status.the NMI is handled in vmx_complete_atomic_exit.
6133 static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
...
vmx_complete_atomic_exit(vmx);
6303 vmx_recover_nmi_blocking(vmx);
6304 vmx_complete_interrupts(vmx);
6305 }
vmx_complete_atomic_exit:in this function,nmi is handled by execute
"int $2",rasise a nmi IRQ in vmx_host.how does this work????
5963 static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
....
5967 if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY
5968 || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
5969 return;
5970
5971 vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5972 exit_intr_info = vmx->exit_intr_info;
...
5977
5978 /* We need to handle NMIs before interrupts are enabled */
5979 if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) ==
INTR_TYPE_NMI_INTR &&
5980 (exit_intr_info & INTR_INFO_VALID_MASK)) {
5981 kvm_before_handle_nmi(&vmx->vcpu);
5982 asm("int $2");
5983 kvm_after_handle_nmi(&vmx->vcpu);
5984 }
5985 }
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