[Xen-users] Intercept RDTSC in HVM Guest VM

["QI Wen" <qiwen@xxxxxxxxxx>]

Hi, all,

I want to do some experiments by adding noise to the RDTSC of Guest VMs.

For  HVM mode, I modified the code in hvm_rdtsc_intercept() as well as adding the printk log.

I tested the modification by running a test program in the HVM Guest. The test program just run the folling code:

1. __asm__ __volatile__
   
2.         (
   
3.          "rdtsc":"=a"(lo),"=d"(hi)
   
4.         );

However, I found that the function hvm_rdtsc_intercept() has not been called because there is no printk

 log I added, when I execute "xl dmesg".

For HVM mode, is it correct to modify hvm_rdtsc_intercept() ?

Any suggestion about intercept the RDTSC instruction in Guest VM? Thanks very much.

Regards 

QI

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