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

["Zhang, Li" <li.zhang@xxxxxxxxx>]

Hi, Dan

I just add some code to produce vmexit. The function vmx_rdtsc_intercept() is 
not completed. It is needed to add some code to get the guest tsc.

Thanks 
--Li

>  -----Original Message-----
>  From: Tian, Kevin
>  Sent: Tuesday, July 08, 2008 9:39 AM
>  To: 'dan.magenheimer@xxxxxxxxxx'; Xen-Devel (E-mail)
>  Cc: Zhang, Li
>  Subject: RE: [Xen-devel] Guest TSC and Xen (Intel and AMD feedback please)
>  
>  >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

Attachment: tsc.patch
Description: tsc.patch

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