[RFT] kvm with Windows optimization

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

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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