對於一個kvm，就對應一個線程。
Kvm完全利用了硬件虛擬化技術，通過cat /proc/cpuinfo 查看信息，如果是intel處理器，那麼就加載kvm-intel.ko
用戶態創建一個虛擬機就是通過ioctl向/dev/kvm字符設備進行設置和管理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 結構體中的所有成員都是函數指針，在kvm-intel.ko 和 kvm-amd.ko這兩個不同的模塊中，針對各自體系做不同的函數。KVM子系統代碼將通過該結構體函數進行實際的硬件操作。
針對kvm的fd，通過KVM_CREATE_VCPU指令字可以創建KVM的vCPU，並且獲得該vcpu_fd,vcpu_fd的操作主要包含在kvm_vcpu_fops中，kvm_vcpu_fops的實現方法如下：
點擊(此處)摺疊或打開
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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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