static bool nested_vmx_l1_wants_exit()

in kvm/vmx/nested.c [5942:6060]

• 103 lines of code
• 57 McCabe index (conditional complexity)

static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu,
				     union vmx_exit_reason exit_reason)
{
	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
	u32 intr_info;

	switch ((u16)exit_reason.basic) {
	case EXIT_REASON_EXCEPTION_NMI:
		intr_info = vmx_get_intr_info(vcpu);
		if (is_nmi(intr_info))
			return true;
		else if (is_page_fault(intr_info))
			return true;
		return vmcs12->exception_bitmap &
				(1u << (intr_info & INTR_INFO_VECTOR_MASK));
	case EXIT_REASON_EXTERNAL_INTERRUPT:
		return nested_exit_on_intr(vcpu);
	case EXIT_REASON_TRIPLE_FAULT:
		return true;
	case EXIT_REASON_INTERRUPT_WINDOW:
		return nested_cpu_has(vmcs12, CPU_BASED_INTR_WINDOW_EXITING);
	case EXIT_REASON_NMI_WINDOW:
		return nested_cpu_has(vmcs12, CPU_BASED_NMI_WINDOW_EXITING);
	case EXIT_REASON_TASK_SWITCH:
		return true;
	case EXIT_REASON_CPUID:
		return true;
	case EXIT_REASON_HLT:
		return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);
	case EXIT_REASON_INVD:
		return true;
	case EXIT_REASON_INVLPG:
		return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
	case EXIT_REASON_RDPMC:
		return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING);
	case EXIT_REASON_RDRAND:
		return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDRAND_EXITING);
	case EXIT_REASON_RDSEED:
		return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDSEED_EXITING);
	case EXIT_REASON_RDTSC: case EXIT_REASON_RDTSCP:
		return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
	case EXIT_REASON_VMREAD:
		return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
			vmcs12->vmread_bitmap);
	case EXIT_REASON_VMWRITE:
		return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
			vmcs12->vmwrite_bitmap);
	case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
	case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
	case EXIT_REASON_VMPTRST: case EXIT_REASON_VMRESUME:
	case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
	case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID:
		/*
		 * VMX instructions trap unconditionally. This allows L1 to
		 * emulate them for its L2 guest, i.e., allows 3-level nesting!
		 */
		return true;
	case EXIT_REASON_CR_ACCESS:
		return nested_vmx_exit_handled_cr(vcpu, vmcs12);
	case EXIT_REASON_DR_ACCESS:
		return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING);
	case EXIT_REASON_IO_INSTRUCTION:
		return nested_vmx_exit_handled_io(vcpu, vmcs12);
	case EXIT_REASON_GDTR_IDTR: case EXIT_REASON_LDTR_TR:
		return nested_cpu_has2(vmcs12, SECONDARY_EXEC_DESC);
	case EXIT_REASON_MSR_READ:
	case EXIT_REASON_MSR_WRITE:
		return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason);
	case EXIT_REASON_INVALID_STATE:
		return true;
	case EXIT_REASON_MWAIT_INSTRUCTION:
		return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING);
	case EXIT_REASON_MONITOR_TRAP_FLAG:
		return nested_vmx_exit_handled_mtf(vmcs12);
	case EXIT_REASON_MONITOR_INSTRUCTION:
		return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING);
	case EXIT_REASON_PAUSE_INSTRUCTION:
		return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) ||
			nested_cpu_has2(vmcs12,
				SECONDARY_EXEC_PAUSE_LOOP_EXITING);
	case EXIT_REASON_MCE_DURING_VMENTRY:
		return true;
	case EXIT_REASON_TPR_BELOW_THRESHOLD:
		return nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW);
	case EXIT_REASON_APIC_ACCESS:
	case EXIT_REASON_APIC_WRITE:
	case EXIT_REASON_EOI_INDUCED:
		/*
		 * The controls for "virtualize APIC accesses," "APIC-
		 * register virtualization," and "virtual-interrupt
		 * delivery" only come from vmcs12.
		 */
		return true;
	case EXIT_REASON_INVPCID:
		return
			nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_INVPCID) &&
			nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
	case EXIT_REASON_WBINVD:
		return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING);
	case EXIT_REASON_XSETBV:
		return true;
	case EXIT_REASON_XSAVES: case EXIT_REASON_XRSTORS:
		/*
		 * This should never happen, since it is not possible to
		 * set XSS to a non-zero value---neither in L1 nor in L2.
		 * If if it were, XSS would have to be checked against
		 * the XSS exit bitmap in vmcs12.
		 */
		return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
	case EXIT_REASON_UMWAIT:
	case EXIT_REASON_TPAUSE:
		return nested_cpu_has2(vmcs12,
			SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE);
	case EXIT_REASON_ENCLS:
		return nested_vmx_exit_handled_encls(vcpu, vmcs12);
	default:
		return true;
	}
}