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?8? IaaS?????

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Title: ?8? IaaS?????

1
?8? IaaS?????

8.1 ??????
8.2 ?????
8.3 ?????
8.4 ????

2
XaaS
3
IaaS

Infrastructure as a Service
?????????????
????
?????
???????????
????
EC2 from Amazon

4
IaaS

I, infrastructure
device or capability
????
????
S, service
????????,????
?????????
?????
???
????
????
????
????

5
8.1 ??????

???????????(Virtual Machine, VM)
??CPU
????
??I/O
????
????

6
????????

???(VM)??????????????
???????????
Popek and Goldberg, Formal Requirements for
Virtualizable Third Generation Architectures,
1974
???
?????????????????????????????????????,?????????,?
?????????
???
VMM(??????)??????????????????,???????,??????
???
??????????????????????VMM????

7
?????
8
????? ????(Hosted)

Host OS VMM Guest OS

????
9
????? ?????(Bare-metal)

VMM OS

(Host OS ) OS
10
Hosted vs. Bare-metal
Bare-metal (Type I) Hosted (Type II)
??? (??Host OS???I/O??)
????
????
????(e.g. 3D??)

??????? ??????
11
???????

????(Emulation)
????(Full Virtualization)
????(Parairtulization)
???????(Hardware Assisted Virtualization)
????????(Operating System Level Virtualization)

12
????(Emulation)

??Hosted??
Host OS ? VMM (Emulator) ? Guest OS?
????
????(Guest)gtgt??gtgtVMMgtgt??gtgt????(Host)
????
Bochs (open source)
QEMU (free)
Virtual PC (Microsoft)

13
????(Full Virtualization)

?????????????
Hosted ? Bare-metal??
????
??????????????????????????????,???????????????
????
IBM CP/CMS
Oracle VirtualBox
KVM
VMware ESX

14
????(Parairtulization)

Bare-metal??
????
???????,??VMM??????????
Guest OS????????????,???VMM
?????????????,?????????
????
Xen
Microsoft Hyper-V

15
Hardware Assisted Virtualization

??????????
????/???????
????
???????????????????????????(????????)?????
????
Intel VT-x
AMD-V (AMD SVM)

16
Operating System Level Virtualization

????Virtual Private Server
????
?????????????????
(????????)
????
chroot for Unix like
Solaris Zone
FreeBSD Jail
Linux-VServer

17
Comparisons
??????? ???? ???? ??????? ????????
?? lt30 3080 80 80 80
?? Hosted Hosted/Bare-metal Bare-metal Hosted/Bare-metal ?Bare-metal
?? Guest OS???? ??????????OS??? Guest OS????,????????,?????? ??????????,?????? ??? ??? ???
?? ????? (??????????100???) ??Hosted???????,???I/O?? ???Guest OS????,?????? ???????? ???OS
?? ????? ?? ???? ???? ????(VPS)
18
CPU????(????)

?????(Ring Compression)??
???????VMM?Guest??????????
?VMM??????Guest????????,?????????
X86??VMM????????Ring 0?,Guest????????Ring
1?,Guest????????Ring 3??
?????????(Binary Translation)??
??????????????
???????Guest??????????????????????????????

19
CPU????( ??????)

??OS????
????Guest OS???,?????????????????????VMM?Hypercall
(????)
Hypercall??Batch(???)??????????,?Hypercall????????
????

20
CPU???????

?????????????,??VMM?Guest OS?????????????
VT-x???????????
Root??(Operation),VMM??????,????????
Non-Root??(Operation),Guest OS?????
??Non-Root ??Guest??????????,?????????Root??VMM,?V
MM??????????

21
?????

??
??????????????,????????????????????,????????????
???????? Shadow Page Table
???Guest?????????,????????????????,?Guest
OS????????
VMM???????MMU??????
?????????
?Guest OS?????????,???VMM?????
???Guest?????,VMM????????????,?Guest??????????????
??
???????????EPT(Extended Page Table)
EPT????????,??????????,?????EPT??
?????????Guest?????????????????

22
I/O???

??
???????????????I/O??,??????????????,?????,????????
??????
????
????I/O??(??????)???????
Guest OS??I/O???????VMM,?VMM????
?Guest OS??,??????????I/O??,?????
????
????(Front-End)/??(Back-End)??,?Guest?I/O????????(
Privileged Domain,????Domain-0)?

23
I/O???