[RFT] kvm with Windows optimization

Avi Kivity
2007-10-25T17:23:46Z

This is a request for testing of an experimental kvm feature that
dramatically accelerates some Windows releases (when running with the
ACPI HAL, and especially with guest SMP). The feature detects accesses
by the guest to the Task Priority Register (TPR) and patches them at
runtime to a kvm-friendly code snipped that is provided by the BIOS.

The upshot of all that is that
http://kvm.qumranet.com/kvmwiki/Windows_ACPI_Workaround is no longer
required, and Windows SMP no longer runs like a dog; it's quite snappy
from my very limited testing.

Please download the test release from
http://people.qumranet.com/avi/tpr-opt-1.tar.gz and give it a spin.
Once it has received some exposure, I'll merge it into mainline.

Credit for the original idea is due to Ben Serebrin.

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