[Xen-devel] Question about time measure in Guest Windows

[XuNanxuan <nanxuan_xu@xxxxxxx>]

Hi:
 
I intend to use RDTSC to make some time tests in Xen guest WinXP. However, from Intel Developer's Manual I noticed that RDTSC will cause VMExit if "RETSC exiting" VM-Execution control field is 1. So I wonder: How to query VM-Execution control field in a programmable way?
 
BTW: On Intel Developer's Manual, it mentioned a method using IA32_VMX_PROCBASED_CTLS MSR, but this is just to report which bits can be set on processor-based VM-EXECUTION controls, rather than telling you the content of this structure.
 
Thanks!

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