对于一个kvm，就对应一个线程。
Kvm完全利用了硬件虚拟化技术，通过cat /proc/cpuinfo 查看信息，如果是intel处理器，那么就加载kvm-intel.ko
用户态创建一个虚拟机就是通过ioctl向/dev/kvm字符设备进行设置和管理kvm的。
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struct kvm {
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spinlock_t mmu_lock;
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spinlock_t requests_lock;
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struct rw_semaphore slots_lock;
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struct mm_struct *mm; /* userspace tied to this vm */
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int nmemslots;
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struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
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KVM_PRIVATE_MEM_SLOTS];
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#ifdef CONFIG_KVM_APIC_ARCHITECTURE
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u32 bsp_vcpu_id;
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struct kvm_vcpu *bsp_vcpu;
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#endif
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struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
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atomic_t online_vcpus;
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struct list_head vm_list;
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struct mutex lock;
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struct kvm_io_bus mmio_bus;
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struct kvm_io_bus pio_bus;
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#ifdef CONFIG_HAVE_KVM_EVENTFD
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struct {
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spinlock_t lock;
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struct list_head items;
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} irqfds;
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struct list_head ioeventfds;
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#endif
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struct kvm_vm_stat stat;
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struct kvm_arch arch;
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atomic_t users_count;
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#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
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struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
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struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
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#endif
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struct mutex irq_lock;
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#ifdef CONFIG_HAVE_KVM_IRQCHIP
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struct list_head irq_routing; /* of kvm_kernel_irq_routing_entry */
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struct hlist_head mask_notifier_list;
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#endif
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#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
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struct mmu_notifier mmu_notifier;
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unsigned long mmu_notifier_seq;
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long mmu_notifier_count;
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#endif
- };
kvm_x86_ops 结构体中的所有成员都是函数指针，在kvm-intel.ko 和 kvm-amd.ko这两个不同的模块中，针对各自体系做不同的函数。KVM子系统代码将通过该结构体函数进行实际的硬件操作。
针对kvm的fd，通过KVM_CREATE_VCPU指令字可以创建KVM的vCPU，并且获得该vcpu_fd,vcpu_fd的操作主要包含在kvm_vcpu_fops中，kvm_vcpu_fops的实现方法如下：
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static struct file_operations kvm_vcpu_fops = {
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.release = kvm_vcpu_release,
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.unlocked_ioctl = kvm_vcpu_ioctl,
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.compat_ioctl = kvm_vcpu_ioctl,
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.mmap = kvm_vcpu_mmap,
- };
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