void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
		       u32 exit_intr_info, unsigned long exit_qualification)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);

	/* trying to cancel vmlaunch/vmresume is a bug */
	WARN_ON_ONCE(vmx->nested.nested_run_pending);

	leave_guest_mode(vcpu);

	if (nested_cpu_has_preemption_timer(vmcs12))
		hrtimer_cancel(&to_vmx(vcpu)->nested.preemption_timer);

	if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
		vcpu->arch.tsc_offset -= vmcs12->tsc_offset;

	if (likely(!vmx->fail)) {
		if (exit_reason == -1)
			sync_vmcs12(vcpu, vmcs12);
		else
			prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info,
				       exit_qualification);

		/*
		 * Must happen outside of sync_vmcs12() as it will
		 * also be used to capture vmcs12 cache as part of
		 * capturing nVMX state for snapshot (migration).
		 *
		 * Otherwise, this flush will dirty guest memory at a
		 * point it is already assumed by user-space to be
		 * immutable.
		 */
		nested_flush_cached_shadow_vmcs12(vcpu, vmcs12);
	} else {
		/*
		 * The only expected VM-instruction error is "VM entry with
		 * invalid control field(s)." Anything else indicates a
		 * problem with L0.  And we should never get here with a
		 * VMFail of any type if early consistency checks are enabled.
		 */
		WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) !=
			     VMXERR_ENTRY_INVALID_CONTROL_FIELD);
		WARN_ON_ONCE(nested_early_check);
	}

	vmx_switch_vmcs(vcpu, &vmx->vmcs01);

	/* Update any VMCS fields that might have changed while L2 ran */
	vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
	vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);

	if (kvm_has_tsc_control)
		decache_tsc_multiplier(vmx);

	if (vmx->nested.change_vmcs01_virtual_apic_mode) {
		vmx->nested.change_vmcs01_virtual_apic_mode = false;
		vmx_set_virtual_apic_mode(vcpu);
	} else if (!nested_cpu_has_ept(vmcs12) &&
		   nested_cpu_has2(vmcs12,
				   SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
		vmx_flush_tlb(vcpu, true);
	}

	/* Unpin physical memory we referred to in vmcs02 */
	if (vmx->nested.apic_access_page) {
		kvm_release_page_dirty(vmx->nested.apic_access_page);
		vmx->nested.apic_access_page = NULL;
	}
	if (vmx->nested.virtual_apic_page) {
		kvm_release_page_dirty(vmx->nested.virtual_apic_page);
		vmx->nested.virtual_apic_page = NULL;
	}
	if (vmx->nested.pi_desc_page) {
		kunmap(vmx->nested.pi_desc_page);
		kvm_release_page_dirty(vmx->nested.pi_desc_page);
		vmx->nested.pi_desc_page = NULL;
		vmx->nested.pi_desc = NULL;
	}

	/*
	 * We are now running in L2, mmu_notifier will force to reload the
	 * page's hpa for L2 vmcs. Need to reload it for L1 before entering L1.
	 */
	kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu);

	if ((exit_reason != -1) && (enable_shadow_vmcs || vmx->nested.hv_evmcs))
		vmx->nested.need_vmcs12_sync = true;

	/* in case we halted in L2 */
	vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;

	if (likely(!vmx->fail)) {
		/*
		 * TODO: SDM says that with acknowledge interrupt on
		 * exit, bit 31 of the VM-exit interrupt information
		 * (valid interrupt) is always set to 1 on
		 * EXIT_REASON_EXTERNAL_INTERRUPT, so we shouldn't
		 * need kvm_cpu_has_interrupt().  See the commit
		 * message for details.
		 */
		if (nested_exit_intr_ack_set(vcpu) &&
		    exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
		    kvm_cpu_has_interrupt(vcpu)) {
			int irq = kvm_cpu_get_interrupt(vcpu);
			WARN_ON(irq < 0);
			vmcs12->vm_exit_intr_info = irq |
				INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
		}

		if (exit_reason != -1)
			trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason,
						       vmcs12->exit_qualification,
						       vmcs12->idt_vectoring_info_field,
						       vmcs12->vm_exit_intr_info,
						       vmcs12->vm_exit_intr_error_code,
						       KVM_ISA_VMX);

		load_vmcs12_host_state(vcpu, vmcs12);

		return;
	}

	/*
	 * After an early L2 VM-entry failure, we're now back
	 * in L1 which thinks it just finished a VMLAUNCH or
	 * VMRESUME instruction, so we need to set the failure
	 * flag and the VM-instruction error field of the VMCS
	 * accordingly, and skip the emulated instruction.
	 */
	(void)nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);

	/*
	 * Restore L1's host state to KVM's software model.  We're here
	 * because a consistency check was caught by hardware, which
	 * means some amount of guest state has been propagated to KVM's
	 * model and needs to be unwound to the host's state.
	 */
	nested_vmx_restore_host_state(vcpu);

	vmx->fail = 0;
}
Unknown