kvm搭建完成了，那么问题来了，到底是什么原理

ｋｖｍ中到底是怎么模拟的ＣＰＵ和内存？

收到了大量的

这里有一个裸的调用ｋｖｍ接口的实例，超赞：

http://www.cnblogs.com/Bozh/p/5753379.html

使用ｋｖｍ的API来实现Emulator Demo，同样赞：

http://soulxu.github.io/blog/2014/08/11/use-kvm-api-write-emulator/

//-----2017.12.17  打开tracepoint，这是研究kvm的好方法：

qemu-system-x86-10102 [001] d... 13485.390144: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .N.. 13485.393300: kvm_exit: reason EXTERNAL_INTERRUPT rip 0x4009b2 info 0 800000ef
 qemu-system-x86-10102 [001] d... 13485.393301: kvm_fpu: unload
 qemu-system-x86-10102 [001] .... 13485.401393: kvm_ple_window: vcpu 0: ple_window 4096 (shrink 4096)
 qemu-system-x86-10102 [001] .... 13485.401398: kvm_fpu: load
 qemu-system-x86-10102 [001] .... 13485.401399: kvm_apic_accept_irq: apicid 0 vec 239 (Fixed|edge)
 qemu-system-x86-10102 [001] .... 13485.401400: kvm_inj_virq: irq 239
 qemu-system-x86-10102 [001] d... 13485.401401: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .... 13485.401419: kvm_eoi: apicid 0 vector 239
 qemu-system-x86-10102 [001] .... 13485.401419: kvm_pv_eoi: apicid 0 vector 239
 qemu-system-x86-10102 [001] .... 13485.401420: kvm_exit: reason MSR_WRITE rip 0xffffffff81064508 info 0 0
 qemu-system-x86-10102 [001] .... 13485.401421: kvm_apic: apic_write APIC_TMICT = 0xafd2
 qemu-system-x86-10102 [001] .... 13485.401422: kvm_msr: msr_write 838 = 0xafd2
 qemu-system-x86-10102 [001] d... 13485.401422: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .... 13485.402142: kvm_exit: reason EXTERNAL_INTERRUPT rip 0x4009b2 info 0 800000ef
 qemu-system-x86-10102 [001] .... 13485.402142: kvm_apic_accept_irq: apicid 0 vec 239 (Fixed|edge)
 qemu-system-x86-10102 [001] .... 13485.402143: kvm_inj_virq: irq 239
 qemu-system-x86-10102 [001] d... 13485.402143: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .... 13485.402146: kvm_eoi: apicid 0 vector 239
 qemu-system-x86-10102 [001] .... 13485.402146: kvm_pv_eoi: apicid 0 vector 239
 qemu-system-x86-10102 [001] .... 13485.402146: kvm_exit: reason MSR_WRITE rip 0xffffffff81064508 info 0 0
 qemu-system-x86-10102 [001] .... 13485.402146: kvm_apic: apic_write APIC_TMICT = 0x3cee0
 qemu-system-x86-10102 [001] .... 13485.402146: kvm_msr: msr_write 838 = 0x3cee0
 qemu-system-x86-10102 [001] d... 13485.402147: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .N.. 13485.403339: kvm_exit: reason EXTERNAL_INTERRUPT rip 0x4009b2 info 0 800000ef
 qemu-system-x86-10102 [001] d... 13485.403341: kvm_fpu: unload
 qemu-system-x86-10102 [001] .... 13485.403521: kvm_ple_window: vcpu 0: ple_window 4096 (shrink 4096)
 qemu-system-x86-10102 [001] .... 13485.403523: kvm_fpu: load
 qemu-system-x86-10102 [001] d... 13485.403523: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .N.. 13485.404571: kvm_exit: reason EXTERNAL_INTERRUPT rip 0x4009b2 info 0 800000ef
 qemu-system-x86-10102 [001] d... 13485.404573: kvm_fpu: unload
 qemu-system-x86-10102 [001] .... 13485.406671: kvm_ple_window: vcpu 0: ple_window 4096 (shrink 4096)
 qemu-system-x86-10102 [001] .... 13485.406676: kvm_fpu: load
 qemu-system-x86-10102 [001] .... 13485.406677: kvm_apic_accept_irq: apicid 0 vec 239 (Fixed|edge)
 qemu-system-x86-10102 [001] .... 13485.406679: kvm_inj_virq: irq 239
 qemu-system-x86-10102 [001] d... 13485.406680: kvm_entry: vcpu 0
 qemu-system-x86-10102 [001] .... 13485.406702: kvm_eoi: apicid 0 vector 239
 qemu-system-x86-10102 [001] .... 13485.406703: kvm_pv_eoi: apicid 0 vector 239
 qemu-system-x86-10102 [001] .... 13485.406704: kvm_exit: reason MSR_WRITE rip 0xffffffff81064508 info 0 0
 qemu-system-x86-10102 [001] .... 13485.406706: kvm_apic: apic_write APIC_TMICT = 0x34720
 qemu-sys

神秘的kvm，服务器端直接运行在，guest按理说也是要有中断的：

   39839 __apic_accept_irq ([kvm])
	           3aa20 kvm_apic_local_deliver ([kvm])
	           3ac7d kvm_inject_apic_timer_irqs ([kvm])
	           3824e kvm_inject_pending_timer_irqs ([kvm])
	           1ebfe kvm_arch_vcpu_ioctl_run ([kvm])
	            610d kvm_vcpu_ioctl ([kvm])
	          4200ff do_vfs_ioctl ([kernel.kallsyms])
	          420369 sys_ioctl ([kernel.kallsyms])
	          a244f2 entry_SYSCALL_64_fastpath ([kernel.kallsyms])

关键函数是

kvm是如何模拟时钟中断的？

kvm_create_pit　  create_pit_timer

kvm_create_

有专门的一章，是讨论中断的虚拟化；

还要个超有意思的函数是：kvm_ｍsr事件，