RE: [Xen-devel] Guest TSC and Xen (Intel and AMD feedback please)

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Dan Magenheimer [mailto:dan.magenheimer@xxxxxxxxxx] 
>Sent: 2008年7月5日 1:32
>
>> >Is this something that you (or Intel in general) could look at?
>> >I would be happy to participate but I don't think I understand
>> >VT well enough.  Once the trap occurs, I suppose Xen system time
>> >could be used as the virtual TSC, possibly scaled up.
>> >
>>
>> There should be tiny related to VT, as only turning on some bit to
>> allow RDTSC trapping and then the rest stuff should be common
>> how to handle it. We'll take a look, but can't commit the time due
>> to other scheduled bandwidth. But if you'd like to jump in early
>> we definitely can help with VT side.
>
>If you can post a patch with code that:
>
>1) declares a boolean global variable: softtsc = 0
>2) if the variable is set, a rdtsc instruction in any hvm
>   domain causes a trap
>3) the trap handler just does a physical rdtsc and returns
>
>then I could probably take it from there.

OK, and Li in CC will take a look and bake a patch for you.

Thanks,
Kevin

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