static __init int hardware_setup(void)
{
	int r = -ENOMEM, i, msr;

	rdmsrl_safe(MSR_EFER, &host_efer);

	for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i)
		kvm_define_shared_msr(i, vmx_msr_index[i]);

	vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_io_bitmap_a)
		return r;

	vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_io_bitmap_b)
		goto out;

	vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_msr_bitmap_legacy)
		goto out1;

	vmx_msr_bitmap_legacy_x2apic =
				(unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_msr_bitmap_legacy_x2apic)
		goto out2;

	vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_msr_bitmap_longmode)
		goto out3;

	vmx_msr_bitmap_longmode_x2apic =
				(unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_msr_bitmap_longmode_x2apic)
		goto out4;

	if (nested) {
		vmx_msr_bitmap_nested =
			(unsigned long *)__get_free_page(GFP_KERNEL);
		if (!vmx_msr_bitmap_nested)
			goto out5;
	}

	vmx_vmread_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_vmread_bitmap)
		goto out6;

	vmx_vmwrite_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_vmwrite_bitmap)
		goto out7;

	memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE);
	memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE);

	/*
	 * Allow direct access to the PC debug port (it is often used for I/O
	 * delays, but the vmexits simply slow things down).
	 */
	memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
	clear_bit(0x80, vmx_io_bitmap_a);

	memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);

	memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
	memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
	if (nested)
		memset(vmx_msr_bitmap_nested, 0xff, PAGE_SIZE);

	if (setup_vmcs_config(&vmcs_config) < 0) {
		r = -EIO;
		goto out8;
	}

	if (boot_cpu_has(X86_FEATURE_NX))
		kvm_enable_efer_bits(EFER_NX);

	if (!cpu_has_vmx_vpid())
		enable_vpid = 0;
	if (!cpu_has_vmx_shadow_vmcs())
		enable_shadow_vmcs = 0;
	if (enable_shadow_vmcs)
		init_vmcs_shadow_fields();

	if (!cpu_has_vmx_ept() ||
	    !cpu_has_vmx_ept_4levels()) {
		enable_ept = 0;
		enable_unrestricted_guest = 0;
		enable_ept_ad_bits = 0;
	}

	if (!cpu_has_vmx_ept_ad_bits())
		enable_ept_ad_bits = 0;

	if (!cpu_has_vmx_unrestricted_guest())
		enable_unrestricted_guest = 0;

	if (!cpu_has_vmx_flexpriority())
		flexpriority_enabled = 0;

	/*
	 * set_apic_access_page_addr() is used to reload apic access
	 * page upon invalidation.  No need to do anything if not
	 * using the APIC_ACCESS_ADDR VMCS field.
	 */
	if (!flexpriority_enabled)
		kvm_x86_ops->set_apic_access_page_addr = NULL;

	if (!cpu_has_vmx_tpr_shadow())
		kvm_x86_ops->update_cr8_intercept = NULL;

	if (enable_ept && !cpu_has_vmx_ept_2m_page())
		kvm_disable_largepages();

	if (!cpu_has_vmx_ple())
		ple_gap = 0;

	if (!cpu_has_vmx_apicv())
		enable_apicv = 0;

	if (cpu_has_vmx_tsc_scaling()) {
		kvm_has_tsc_control = true;
		kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
		kvm_tsc_scaling_ratio_frac_bits = 48;
	}

	vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
	vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
	vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
	vmx_disable_intercept_for_msr(MSR_IA32_BNDCFGS, true);

	memcpy(vmx_msr_bitmap_legacy_x2apic,
			vmx_msr_bitmap_legacy, PAGE_SIZE);
	memcpy(vmx_msr_bitmap_longmode_x2apic,
			vmx_msr_bitmap_longmode, PAGE_SIZE);

	set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */

	if (enable_apicv) {
		for (msr = 0x800; msr <= 0x8ff; msr++)
			vmx_disable_intercept_msr_read_x2apic(msr);

		/* According SDM, in x2apic mode, the whole id reg is used.
		 * But in KVM, it only use the highest eight bits. Need to
		 * intercept it */
		vmx_enable_intercept_msr_read_x2apic(0x802);
		/* TMCCT */
		vmx_enable_intercept_msr_read_x2apic(0x839);
		/* TPR */
		vmx_disable_intercept_msr_write_x2apic(0x808);
		/* EOI */
		vmx_disable_intercept_msr_write_x2apic(0x80b);
		/* SELF-IPI */
		vmx_disable_intercept_msr_write_x2apic(0x83f);
	}

	if (enable_ept) {
		kvm_mmu_set_mask_ptes(0ull,
			(enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
			(enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
			0ull, VMX_EPT_EXECUTABLE_MASK);
		ept_set_mmio_spte_mask();
		kvm_enable_tdp();
	} else
		kvm_disable_tdp();

	update_ple_window_actual_max();

	/*
	 * Only enable PML when hardware supports PML feature, and both EPT
	 * and EPT A/D bit features are enabled -- PML depends on them to work.
	 */
	if (!enable_ept || !enable_ept_ad_bits || !cpu_has_vmx_pml())
		enable_pml = 0;

	if (!enable_pml) {
		kvm_x86_ops->slot_enable_log_dirty = NULL;
		kvm_x86_ops->slot_disable_log_dirty = NULL;
		kvm_x86_ops->flush_log_dirty = NULL;
		kvm_x86_ops->enable_log_dirty_pt_masked = NULL;
	}

	kvm_set_posted_intr_wakeup_handler(wakeup_handler);

	return alloc_kvm_area();

out8:
	free_page((unsigned long)vmx_vmwrite_bitmap);
out7:
	free_page((unsigned long)vmx_vmread_bitmap);
out6:
	if (nested)
		free_page((unsigned long)vmx_msr_bitmap_nested);
out5:
	free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic);
out4:
	free_page((unsigned long)vmx_msr_bitmap_longmode);
out3:
	free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic);
out2:
	free_page((unsigned long)vmx_msr_bitmap_legacy);
out1:
	free_page((unsigned long)vmx_io_bitmap_b);
out:
	free_page((unsigned long)vmx_io_bitmap_a);

    return r;
}