ether with xen4.2.1 : The Xp Blue Screen

[王乐]

 I want to patch ether in xen4.2.1 and compiled  ether controller. After that I rebooted in ether, start the command sudo ./ether 1 systrace,
but the xp sp3 32bit was Blue Screen and shows "A problem has been detected and windows has been shut down to prevent damage to your computer. "
 
I also refer to https://code.google.com/p/mether/source/browse/trunk/?r=2#trunk%2Fether
and start the syscall trace command, and the Xp system had the same error.

Does anyone have any suggestions on how to fix this?

Thank you for your help,

[王乐]

It may relate to __vmwrite(GUEST_SYSENTER_EIP, new_eip);?

[Artem D]

Hi,

I am not sure if anyone else had tried porting ehther to Xen 4.2.1. There are many possibilities about what could be wrong. 

Here are some questions to answer:

- Are you getting vmexits for your faked sysenter_eip? Maybe the address you picked is a valid VA in the guest. Maybe there is some vm control setting that prevents vmexits on page faults. 

An option is to set sysenter_cs to an invalid segment, which will cause a vmexit and be more portable. 

- if you also have instruction tracing, is your guest in non-pae mode and does your shadow page table modification code work?

Finally, if you get it working I hope you release your code. Many people have asked about porting ether to a newer Xen, but no one has had the time to do it. An updated version would be very useful.

Arten

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[王乐]

Thanks very much for your reply!

(1) When I  start the syscall command, the domU  Blue Screen Immediately and reboot with another domid. I agree that some vm control setting that prevents vmexits on page faults because no printk in dmesg. The faked VA is 0xFFFFD0AE. I try set The CS later.

(2) When   instruction tracing in no-pae mode , the command  suspend  at xc_evtchn_pending function, Maybe there are some problems.

(3) I am very happy to share and discuss the code because my limited capacity, quickly I will copy some key codes, welcome to discuss and guide!

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