Virtual Machines. Virtual Machines
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1 Virtual Machines Virtual Machines What is a virtual machine? Examples? Benefits? 1
2 Virtualization Creation of an isomorphism that maps a virtual guest system to a real host: Maps guest state S to host state V(S) For any sequence of operations on the guest that changes guest state S1 to S2, there is a sequence of operations on the host that maps state V(S1) to V(S2) Important Interfaces Application programmer interface: High-level language library such asclib Application binary interface (ABI): User instruction (User ISA) System calls Hardware-software interface: Instruction set architecture (ISA) 2
3 What s a Machine? Machine is an entity that provides an interface Program view: Machine = Entity that provides the API (language) Process view: Machine = Entity that provides the ABI Operating system view: Machine = Entity that provides the ISA What s a Virtual Machine? Virtual machine is an entity that emulates a guest interface on top of a host machine Language view: Virtual machine = Entity that emulates an API (e.g., JAVA) on top of another Virtualizing software = compiler/interpreter Process view: Machine = Entity that emulates an ABI on top of another Virtualizing software = runtime Operating system view: Machine = Entity that emulates an ISA Virtualizing software = virtual machine monitor (VMM) 3
4 Purpose of a Virtual Machine Emulation Create the illusion of having one type of machine on top of another Replication Create the illusion of multiple independent smaller guest machines on top of one host machine Optimization Optimize a generic guest interface for one type of host Types of Virtual Machines Emulate (ISA/ABI/API) for purposes of (Emulation/Replication/Optimization) on top of (the same/different) one. 4
5 Types of Virtual Machines Emulate (ISA/ABI/API) for purposes of (Emulation/Replication/Optimization) on top of (the same/different) one. Process/language virtual machines (emulate ABI/API) System virtual machines (emulate ISA) Types of Virtual Machines Emulate (ISA/ABI/API) for purposes of (Emulation/Replication/Optimization) on top of (the same/different) one. Process/language virtual machines (emulate ABI/API) System virtual machines (emulate ISA) 5
6 Example 1 - Multiprogramming Emulate what interface? For what purpose? On top of what? Example 1 - Multiprogramming Emulate the ABI (user ISA + OS system calls) For purposes of replication (multiple processes share a physical machine) On top of the same ISA/OS 6
7 Example 2: Emulation Emulate one ABI on top of another Emulate a Intel IA-32 running WindowsXP on top of PowerPC running MacOS (i.e., run a process compiled for IA-32/Windows on PowerPC/MacOS) Interpreters: Pick one guest instruction at a time, update (simulated) host state using a set of host instructions Binary translation: Do the translation in one step, not one line at a time. Run the translated binary Example 3: Binary Optimization Emulate one ABI on top of itself for purposes of optimization Run the process binary, collect profiling data, then implement it more efficiently on top of the same machine/os interface. 7
8 Example 4: Language Virtual Machines Emulate one API on top of a set of different ABIs Compile guest API to intermediate form (e.g., JAVA source to JAVA bytecode) Interpret the bytecode on top of different host ABIs Examples: JAVA Microsoft Common Language Infrastructure (CLI), the foundation of.net Types of Virtual Machines Emulate (ISA/ABI/API) for purposes of (Emulation/Replication/Optimization) on top of (the same/different) one. Process/language virtual machines (emulate ABI/API) System virtual machines (emulate ISA) 8
9 Types of Virtual Machines Emulate (ISA/ABI/API) for purposes of (Emulation/Replication/Optimization) on top of (the same/different) one. Process/language virtual machines (emulate ABI/API) System virtual machines (emulate ISA) System Virtual Machines (Conventional Same ISA) Implement VMM (ISA emulation) on bare hardware Efficient Must wipe out current operating system to install Must support drivers for VMM Implement VMM on top of a host OS (Hosted VM) Less efficient Easy to install on top of host OS Leverages host OS drivers 9
10 Whole System Virtual Machines Emulate one ISA on top of another Typically runs on top of host OS (e.g., install Windows compiled for IA-32 on top of MacOS running on PowerPC) Note: this is different from a process virtual machine that emulates the Windows interface and user IA-32 instructions on top of MacOS running on PowerPC) Taxonomy Process VMs Same ISA Multiprogrammed systems Different ISA Dynamic translators (Java) System VMs Same ISA Classic VMs Hosted VMs (VMWare) Different ISA Whole system VMs 10
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