RE: [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support

["Wei, Gang" <gang.wei@xxxxxxxxx>]

Keir Fraser wrote on 2010-12-14:
>>> Writing any value to LVTT zaps TMICT,TMCCT,MSR_TDT? That seems
>>> pretty unlikely to me! This obviously has effects on behaviour
>>> outside TDT emulation as it affects TMICT/TMCCT emulation. Looks
>>> dangerous, as well as wrong.
>> 
>> It should be better to do the zaps only while the mode bits of LVTT changes.
> 
> What is real hardware behaviour here? I don't see any zappings documented.

SDM said "A write to the LVT Timer Register that changes the timer mode
disarms the local APIC timer".

Jimmy



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