Function svm_inj_interrupts

freebsd/amd64/vmm/amd/svm.c:1607–1785

* Inject event to virtual cpu. */

 * Inject event to virtual cpu.
 */
static void
svm_inj_interrupts(struct svm_softc *sc, int vcpu, struct vlapic *vlapic)
{
	struct vmcb_ctrl *ctrl;
	struct vmcb_state *state;
	struct svm_vcpu *vcpustate;
	uint8_t v_tpr;
	int vector, need_intr_window;
	int extint_pending;

	state = svm_get_vmcb_state(sc, vcpu);
	ctrl  = svm_get_vmcb_ctrl(sc, vcpu);
	vcpustate = svm_get_vcpu(sc, vcpu);

	need_intr_window = 0;

	if (vcpustate->nextrip != state->rip) {
		ctrl->intr_shadow = 0;
		VCPU_CTR2(sc->vm, vcpu, "Guest interrupt blocking "
		    "cleared due to rip change: %#lx/%#lx",
		    vcpustate->nextrip, state->rip);
	}

	/*
	 * Inject pending events or exceptions for this vcpu.
	 *
	 * An event might be pending because the previous #VMEXIT happened
	 * during event delivery (i.e. ctrl->exitintinfo).
	 *
	 * An event might also be pending because an exception was injected
	 * by the hypervisor (e.g. #PF during instruction emulation).
	 */
	svm_inj_intinfo(sc, vcpu);

	/* NMI event has priority over interrupts. */
	if (vm_nmi_pending(sc->vm, vcpu)) {
		if (nmi_blocked(sc, vcpu)) {
			/*
			 * Can't inject another NMI if the guest has not
			 * yet executed an "iret" after the last NMI.
			 */
			VCPU_CTR0(sc->vm, vcpu, "Cannot inject NMI due "
			    "to NMI-blocking");
		} else if (ctrl->intr_shadow) {
			/*
			 * Can't inject an NMI if the vcpu is in an intr_shadow.
			 */
			VCPU_CTR0(sc->vm, vcpu, "Cannot inject NMI due to "
			    "interrupt shadow");
			need_intr_window = 1;
			goto done;
		} else if (ctrl->eventinj & VMCB_EVENTINJ_VALID) {
			/*
			 * If there is already an exception/interrupt pending
			 * then defer the NMI until after that.
			 */
			VCPU_CTR1(sc->vm, vcpu, "Cannot inject NMI due to "
			    "eventinj %#lx", ctrl->eventinj);