对于cpu体系架构和Linux内核的KVM架构来说，两者需要相互配合，以实现整个虚拟化的统一。
对于X86来说，它主要是一个 vmx_x86_ops对象，并且定义一个全局对象struct kvm_x86_ops *kvm_x86_ops;
这样，X86下的vmx_x86_ops 向内核的KVM层注册，KVM层回调这些函数。
对于X86来说，它自定义了一个struct kvm_x86_ops *kvm_x86_ops对象，这样，在KVM层回调时，在X86下面通过全局的kvm_x86_ops
来回调处理。
对于KVM来说，X86向KVM层注册回调函数是通过kvm_init()进行的，这个函数实现在Linux kernel的KVM架构层，各个具体支持KVM虚拟化的cpu
需要调用这个kvm_init函数。对X86来说，其通过函数kvm_arch_init设置全局的kvm_x86_ops = ops;
x86实现的体系架构的vmx操作如下：
arch/x86/include/asm/kvm_host.h
static struct kvm_x86_ops vmx_x86_ops = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
.hardware_setup = hardware_setup,
.hardware_unsetup = hardware_unsetup,
.check_processor_compatibility = vmx_check_processor_compat,
.hardware_enable = hardware_enable,
.hardware_disable = hardware_disable,
.cpu_has_accelerated_tpr = report_flexpriority,
.cpu_has_high_real_mode_segbase = vmx_has_high_real_mode_segbase,
.vcpu_create = vmx_create_vcpu,
.vcpu_free = vmx_free_vcpu,
.vcpu_reset = vmx_vcpu_reset,
.prepare_guest_switch = vmx_save_host_state,
.vcpu_load = vmx_vcpu_load,
.vcpu_put = vmx_vcpu_put,
.update_bp_intercept = update_exception_bitmap,
.get_msr = vmx_get_msr,
.set_msr = vmx_set_msr,
.get_segment_base = vmx_get_segment_base,
.get_segment = vmx_get_segment,
.set_segment = vmx_set_segment,
.get_cpl = vmx_get_cpl,
.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
.decache_cr0_guest_bits = vmx_decache_cr0_guest_bits,
.decache_cr3 = vmx_decache_cr3,
.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
.set_cr0 = vmx_set_cr0,
.set_cr3 = vmx_set_cr3,
.set_cr4 = vmx_set_cr4,
.set_efer = vmx_set_efer,
.get_idt = vmx_get_idt,
.set_idt = vmx_set_idt,
.get_gdt = vmx_get_gdt,
.set_gdt = vmx_set_gdt,
.get_dr6 = vmx_get_dr6,
.set_dr6 = vmx_set_dr6,
.set_dr7 = vmx_set_dr7,
.sync_dirty_debug_regs = vmx_sync_dirty_debug_regs,
.cache_reg = vmx_cache_reg,
.get_rflags = vmx_get_rflags,
.set_rflags = vmx_set_rflags,
.get_pkru = vmx_get_pkru,
.fpu_activate = vmx_fpu_activate,
.fpu_deactivate = vmx_fpu_deactivate,
.tlb_flush = vmx_flush_tlb,
.run = vmx_vcpu_run,
.handle_exit = vmx_handle_exit,
.skip_emulated_instruction = skip_emulated_instruction,
.set_interrupt_shadow = vmx_set_interrupt_shadow,
.get_interrupt_shadow = vmx_get_interrupt_shadow,
.patch_hypercall = vmx_patch_hypercall,
.set_irq = vmx_inject_irq,
.set_nmi = vmx_inject_nmi,
.queue_exception = vmx_queue_exception,
.cancel_injection = vmx_cancel_injection,
.interrupt_allowed = vmx_interrupt_allowed,
.nmi_allowed = vmx_nmi_allowed,
.get_nmi_mask = vmx_get_nmi_mask,
.set_nmi_mask = vmx_set_nmi_mask,
.enable_nmi_window = enable_nmi_window,
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
.set_virtual_x2apic_mode = vmx_set_virtual_x2apic_mode,
.set_apic_access_page_addr = vmx_set_apic_access_page_addr,
.get_enable_apicv = vmx_get_enable_apicv,
.refresh_apicv_exec_ctrl = vmx_refresh_apicv_exec_ctrl,
.load_eoi_exitmap = vmx_load_eoi_exitmap,
.hwapic_irr_update = vmx_hwapic_irr_update,
.hwapic_isr_update = vmx_hwapic_isr_update,
.sync_pir_to_irr = vmx_sync_pir_to_irr,
.deliver_posted_interrupt = vmx_deliver_posted_interrupt,
.set_tss_addr = vmx_set_tss_addr,
.get_tdp_level = get_ept_level,
.get_mt_mask = vmx_get_mt_mask,
.get_exit_info = vmx_get_exit_info,
.get_lpage_level = vmx_get_lpage_level,
.cpuid_update = vmx_cpuid_update,
.rdtscp_supported = vmx_rdtscp_supported,
.invpcid_supported = vmx_invpcid_supported,
.set_supported_cpuid = vmx_set_supported_cpuid,
.has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
.write_tsc_offset = vmx_write_tsc_offset,
.set_tdp_cr3 = vmx_set_cr3,
.check_intercept = vmx_check_intercept,
.handle_external_intr = vmx_handle_external_intr,
.mpx_supported = vmx_mpx_supported,
.xsaves_supported = vmx_xsaves_supported,
.check_nested_events = vmx_check_nested_events,
.sched_in = vmx_sched_in,
.slot_enable_log_dirty = vmx_slot_enable_log_dirty,
.slot_disable_log_dirty = vmx_slot_disable_log_dirty,
.flush_log_dirty = vmx_flush_log_dirty,
.enable_log_dirty_pt_masked = vmx_enable_log_dirty_pt_masked,
.pre_block = vmx_pre_block,
.post_block = vmx_post_block,
.pmu_ops = &intel_pmu_ops,
.update_pi_irte = vmx_update_pi_irte,
#ifdef CONFIG_X86_64
.set_hv_timer = vmx_set_hv_timer,
.cancel_hv_timer = vmx_cancel_hv_timer,
#endif
.setup_mce = vmx_setup_mce,
};
