static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
				    struct vmx_capability *vmx_cap)
{
	u32 vmx_msr_low, vmx_msr_high;
	u32 min, opt, min2, opt2;
	u32 _pin_based_exec_control = 0;
	u32 _cpu_based_exec_control = 0;
	u32 _cpu_based_2nd_exec_control = 0;
	u32 _vmexit_control = 0;
	u32 _vmentry_control = 0;

	memset(vmcs_conf, 0, sizeof(*vmcs_conf));
	min = CPU_BASED_HLT_EXITING |
#ifdef CONFIG_X86_64
	      CPU_BASED_CR8_LOAD_EXITING |
	      CPU_BASED_CR8_STORE_EXITING |
#endif
	      CPU_BASED_CR3_LOAD_EXITING |
	      CPU_BASED_CR3_STORE_EXITING |
	      CPU_BASED_UNCOND_IO_EXITING |
	      CPU_BASED_MOV_DR_EXITING |
	      CPU_BASED_USE_TSC_OFFSETTING |
	      CPU_BASED_MWAIT_EXITING |
	      CPU_BASED_MONITOR_EXITING |
	      CPU_BASED_INVLPG_EXITING |
	      CPU_BASED_RDPMC_EXITING;

	opt = CPU_BASED_TPR_SHADOW |
	      CPU_BASED_USE_MSR_BITMAPS |
	      CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
				&_cpu_based_exec_control) < 0)
		return -EIO;
#ifdef CONFIG_X86_64
	if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
		_cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
					   ~CPU_BASED_CR8_STORE_EXITING;
#endif
	if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
		min2 = 0;
		opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
			SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
			SECONDARY_EXEC_WBINVD_EXITING |
			SECONDARY_EXEC_ENABLE_VPID |
			SECONDARY_EXEC_ENABLE_EPT |
			SECONDARY_EXEC_UNRESTRICTED_GUEST |
			SECONDARY_EXEC_PAUSE_LOOP_EXITING |
			SECONDARY_EXEC_DESC |
			SECONDARY_EXEC_ENABLE_RDTSCP |
			SECONDARY_EXEC_ENABLE_INVPCID |
			SECONDARY_EXEC_APIC_REGISTER_VIRT |
			SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
			SECONDARY_EXEC_SHADOW_VMCS |
			SECONDARY_EXEC_XSAVES |
			SECONDARY_EXEC_RDSEED_EXITING |
			SECONDARY_EXEC_RDRAND_EXITING |
			SECONDARY_EXEC_ENABLE_PML |
			SECONDARY_EXEC_TSC_SCALING |
			SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE |
			SECONDARY_EXEC_PT_USE_GPA |
			SECONDARY_EXEC_PT_CONCEAL_VMX |
			SECONDARY_EXEC_ENABLE_VMFUNC |
			SECONDARY_EXEC_BUS_LOCK_DETECTION;
		if (cpu_has_sgx())
			opt2 |= SECONDARY_EXEC_ENCLS_EXITING;
		if (adjust_vmx_controls(min2, opt2,
					MSR_IA32_VMX_PROCBASED_CTLS2,
					&_cpu_based_2nd_exec_control) < 0)
			return -EIO;
	}
#ifndef CONFIG_X86_64
	if (!(_cpu_based_2nd_exec_control &
				SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
		_cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
#endif

	if (!(_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
		_cpu_based_2nd_exec_control &= ~(
				SECONDARY_EXEC_APIC_REGISTER_VIRT |
				SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
				SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);

	rdmsr_safe(MSR_IA32_VMX_EPT_VPID_CAP,
		&vmx_cap->ept, &vmx_cap->vpid);

	if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
		/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
		   enabled */
		_cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
					     CPU_BASED_CR3_STORE_EXITING |
					     CPU_BASED_INVLPG_EXITING);
	} else if (vmx_cap->ept) {
		vmx_cap->ept = 0;
		pr_warn_once("EPT CAP should not exist if not support "
				"1-setting enable EPT VM-execution control\n");
	}
	if (!(_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_VPID) &&
		vmx_cap->vpid) {
		vmx_cap->vpid = 0;
		pr_warn_once("VPID CAP should not exist if not support "
				"1-setting enable VPID VM-execution control\n");
	}

	min = VM_EXIT_SAVE_DEBUG_CONTROLS | VM_EXIT_ACK_INTR_ON_EXIT;
#ifdef CONFIG_X86_64
	min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
	opt = VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL |
	      VM_EXIT_LOAD_IA32_PAT |
	      VM_EXIT_LOAD_IA32_EFER |
	      VM_EXIT_CLEAR_BNDCFGS |
	      VM_EXIT_PT_CONCEAL_PIP |
	      VM_EXIT_CLEAR_IA32_RTIT_CTL;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
				&_vmexit_control) < 0)
		return -EIO;

	min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
	opt = PIN_BASED_VIRTUAL_NMIS | PIN_BASED_POSTED_INTR |
		 PIN_BASED_VMX_PREEMPTION_TIMER;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
				&_pin_based_exec_control) < 0)
		return -EIO;

	if (cpu_has_broken_vmx_preemption_timer())
		_pin_based_exec_control &= ~PIN_BASED_VMX_PREEMPTION_TIMER;
	if (!(_cpu_based_2nd_exec_control &
		SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY))
		_pin_based_exec_control &= ~PIN_BASED_POSTED_INTR;

	min = VM_ENTRY_LOAD_DEBUG_CONTROLS;
	opt = VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL |
	      VM_ENTRY_LOAD_IA32_PAT |
	      VM_ENTRY_LOAD_IA32_EFER |
	      VM_ENTRY_LOAD_BNDCFGS |
	      VM_ENTRY_PT_CONCEAL_PIP |
	      VM_ENTRY_LOAD_IA32_RTIT_CTL;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
				&_vmentry_control) < 0)
		return -EIO;

	/*
	 * Some cpus support VM_{ENTRY,EXIT}_IA32_PERF_GLOBAL_CTRL but they
	 * can't be used due to an errata where VM Exit may incorrectly clear
	 * IA32_PERF_GLOBAL_CTRL[34:32].  Workaround the errata by using the
	 * MSR load mechanism to switch IA32_PERF_GLOBAL_CTRL.
	 */
	if (boot_cpu_data.x86 == 0x6) {
		switch (boot_cpu_data.x86_model) {
		case 26: /* AAK155 */
		case 30: /* AAP115 */
		case 37: /* AAT100 */
		case 44: /* BC86,AAY89,BD102 */
		case 46: /* BA97 */
			_vmentry_control &= ~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
			_vmexit_control &= ~VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
			pr_warn_once("kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL "
					"does not work properly. Using workaround\n");
			break;
		default:
			break;
		}
	}


	rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);

	/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
	if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
		return -EIO;

#ifdef CONFIG_X86_64
	/* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
	if (vmx_msr_high & (1u<<16))
		return -EIO;
#endif

	/* Require Write-Back (WB) memory type for VMCS accesses. */
	if (((vmx_msr_high >> 18) & 15) != 6)
		return -EIO;

	vmcs_conf->size = vmx_msr_high & 0x1fff;
	vmcs_conf->order = get_order(vmcs_conf->size);
	vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff;

	vmcs_conf->revision_id = vmx_msr_low;

	vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
	vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
	vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
	vmcs_conf->vmexit_ctrl         = _vmexit_control;
	vmcs_conf->vmentry_ctrl        = _vmentry_control;

#if IS_ENABLED(CONFIG_HYPERV)
	if (enlightened_vmcs)
		evmcs_sanitize_exec_ctrls(vmcs_conf);
#endif

	return 0;
}
Unknown