Re: SIGILL in grub in guest on 4365

["Gregory Haskins" <ghaskins-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org>]

>>> On Thu, Feb 1, 2007 at  7:46 AM, in message <45C1E116.1070802-atKUWr5tajBWk0Htik3J/w@public.gmane.org>,
Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote: 
> Gregory Haskins wrote:
>
>> 1) Is this how illegal- op would be handled, or would that stay entirely in 
> the domain of the guest?  
>>   
> 
> An illegal opcode in the guest is handled normally by generating #UD in 
> the guest, without host involvement at all.
> 

Ah, thank you.   Sounds like I need to do some more reading in the Intel docs ;)  Despite my failings here, I did learn a lot about KVM/QEMU in the process so it wasnt wasted effort.

> 
> My guess is that some horrible bug in the mmu is causing the guest to 
> jump to some random page and actually execute undefined opcodes. 

Yuk...that makese sense though.  I can run sync() from other applications just fine so its probably dependent on the locations resolved by the dynamic linker.  I have some ideas for a tool that might be helpful here.  More to follow.


Thanks for the info and quick reply, BTW.
-Greg


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