Re: kvm-kmod.git

[Avi Kivity <avi@redhat.com>]

Ryan Harper wrote:
>> So:
>>  LINUX= is for the kvm sources (further controlled by whatever branch 
>> is checked out)
>>  --kerneldir= is for the host kernel
>>     
>
> Ah, excellent, I didn't see it documented on the Code page of the wiki
> and I blindly assumed that it went away.  Thanks for correction.
>   

It actually did go away, but Jan brought it back.

>>> The reason I'm digging is that I'm seeing 64-bit migration failing on
>>> maint/2.6.29 kvm modules, but not on upstream kvm kernel bits and I
>>> wanted to bisect to find where 64-bit migration is fixed so I can
>>> suggest what to pull into maint/2.6.29.
>>>  
>>>       
>> Thanks, that's helpful.  How does it fail?  maybe I can supply an 
>> educated guess.
>>     
>
> Migration succeeds, but source and target are frozen (though monitor of
> guest is still interactive. 
>
> Nothing interesting in host dmesg, and of course no output from either
> guest (they seemed locked).  Reproduced this sort of hang for any number
> of guests (RHEL4u7/8, SLES10 SP2, SLES11, Win2k3-r2, win2k8, etc.) as
> long as they are 64-bit
>   

SMP?  Uniprocessor?

Try 'info registers' on both source and target and compare.  Maybe we 
lose some bit in EFER.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.