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17
Extending Intel Virtualization
Technology
support for I/O device virtualization
direct I/O virtualization to the chipset(“VT-d”).
Currently, I/O devices aren’t aware of virtualization
and must go through the VMM before being
assigned to a virtual machine.
software emulation slow
Performance
>
I/O requests must traverse two I/O stacks (guest and host)
Functionality
>
Guest OSes “see” only restricted sets of legacy devices
Reliability
>
Drivers are potentially undependable if they run as part of privileged
software