Virtual Machine Monitor
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1 Virtual Machine Monitor Applications Process File system Virtual memory I/O Devices Operating System Network Hardware Virtual Machine Monitor CPU Disk RAM 1
2 What is a VMM? OS offers illusion that each process is running on its own computer A VMM virtualizes an entire physical machine VMM offers illusion that OS has full control over the hardware VMM applications (OSes) run in virtual machines Implication: Can run multiple instances of different OSes simultaneously on a machine 2
3 Why do such a crazy thing? Resource utilization Machines today are powerful, multiplex their hardware» Example: Cloud services Migrate VMs across machines without shutdown Software use and development Can run multiple OSes simultaneously» No need to dual boot Can do system (e.g., OS) development at user-level Many other cool applications Debugging, emulation, security, fault tolerance, 3
4 Example of Cool VMM Tricks How to experiment with apps, protocols, and systems on future hardware? Example: How to experiment with 100 Gbps network? Time dilation VMM slows timer interrupt to make hardware (CPU, disk, network) appear faster to OS and apps Example:» OS reads 10 Gb of data from network in 1 second, but thinks only 0.1 second has elapsed» But, applications run 10x slower 4
5 VMM Requirements Fidelity OSes and applications work without modification» (although we may modify the OS a bit) Isolation VMM protects resources and VMs from each other Performance VMM is another layer of software à overhead» As with OS, want to minimize this overhead 5
6 VMware Hypervisor Model Applications Operating System Hardware Virtual Machine Monitor Hardware 6
7 VMware Hosted Architecture 7
8 Xen Architecture 8
9 What needs to be virtualized? Exactly what you would expect CPU Events Memory I/O devices Isn t this just duplicating OS functionality? Yes and no Approaches will be similar to what OS does» Simpler functionality (VMM much smaller than OS) But implements a different abstraction» Hardware interface vs. OS interface 9
10 Virtualizing Memory OS assumes full control over memory But VMM partitions memory among VMs VMM needs to control mappings for isolation» OS can only map to a physical page given to it by VMM Solution: Need MMU support to handle two-levels of page tables 10
11 Shadow Page Tables 11
12 Monitors for Synchronization Lack of race conditions relies on correct use of locks and condition variables For example, must remember to acquire correct lock before accessing shared set How to detect improper use of locks? 12
13 Dynamic analysis Monitor program s execution to detect unsafe access For example, detect possible simultaneous access using happensbefore relationship between synchronization events 13
14 Problem with happens-before Ability to detect race conditions depends on interleavings produced by scheduler 14
15 Eraser Associate every variable with a set of locks Initialize to union of all locks Whenever the variable is accessed thereafter, lockset = lockset set of locks held by current thread Race condition detected if lockset becomes empty 15
16 Scheduling Problems with scheduling strategies we ve discussed? Priority? Round robin? Trade-off between responsiveness and fairness 16
17 Priority Inversion P H x->acquire() time P L x->acquire() x->release() P H x->acquire() time P M P L x->acquire() 17
18 Lottery Scheduling Every process/thread is assigned some number of lottery tickets Winner of lottery gets access to resource Benefits? No starvation Responsive: can dynamically modify ticket allocation Easy handling of priority inversion problem Drawbacks? Complicates the policy of ticket allocation E.g.: what to do in the case of process birth/death? 18
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