[Xen-devel] FXSAVE instruction emulation

[Abhinav Srivastava <abhinavs_iitkgp@xxxxxxxxxxx>]

Hi there,

I am using Xen-3.2 on Intel-VT hardware. My guest VM is running Linux kernel 
2.6.21 in HVM mode.

I was trying to do some emulation from the hypervisor and my code was failing 
to emulate FXSAVE instructions. I looked on the mailing list and found the 
following patch that does that:

"[Xen-devel] [PATCH 2/4] Enable VirtualPC 2007 run on top of XEN: fxsave" from 
[Su, Disheng]

However, when I applied this patch it is still not working. I am going to the 
default case of this patch that directly calls "goto cannot_emulate". When I 
printed the instruction it is like this: 0f ae e8. The value of modrm_reg that 
patch uses to check which case statement to execute is 05. 
The patch only handles the value 0.

Could some explain what does this mean? And, how to solve this problem? 

Any help would be appreciated.

Thanks,
Abhinav



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