[Qemu-devel] kqemu in 0.7.2 no longer boots Xen

[Qemu-devel] kqemu in 0.7.2 no longer boots Xen

[Anthony Liguori]

Admittedly this is probably not a standard usage, but I'm using qemu for 
Xen development (Xen is an Open Source hypervisor).  It works quite well 
so far.

0.7.2 seems to have broken support for kqemu.  Linux freezes during boot 
(running in ring 1 under Xen) right before launching the INIT process.  
Passing -no-kqemu or reverting to 0.7.1 makes the problem go away.

Without knowing the differences in kqemu between versions, it's hard to 
narrow down any further.  I looked at the diffs for qemu though and did 
not see anything obvious.

Let me know if there's anything I can do to help narrow down the problem.

Thanks!

Regards,

Anthony Liguori

Re: [Qemu-devel] kqemu in 0.7.2 no longer boots Xen

[Paul Brook]

On Monday 12 September 2005 22:37, Anthony Liguori wrote:
> Admittedly this is probably not a standard usage, but I'm using qemu for
> Xen development (Xen is an Open Source hypervisor).  It works quite well
> so far.
>
> 0.7.2 seems to have broken support for kqemu.  Linux freezes during boot
> (running in ring 1 under Xen) right before launching the INIT process.
> Passing -no-kqemu or reverting to 0.7.1 makes the problem go away.
>
> Without knowing the differences in kqemu between versions, it's hard to
> narrow down any further.  I looked at the diffs for qemu though and did
> not see anything obvious.

kqemu is a proprierary module only available as a binary object. You have 
approximately zero chance of finding or fixing bugs in it.

Paul

Re: [Qemu-devel] kqemu in 0.7.2 no longer boots Xen

[Anthony Liguori]

Paul Brook wrote:

>On Monday 12 September 2005 22:37, Anthony Liguori wrote:
>
>>Without knowing the differences in kqemu between versions, it's hard to
>>narrow down any further.  I looked at the diffs for qemu though and did
>>not see anything obvious.
>>    
>>
>
>kqemu is a proprierary module only available as a binary object. You have 
>approximately zero chance of finding or fixing bugs in it.
>  
>
Hi Paul,

FWIW, I've also tried to get Xen running under qvm86 with no success.  
The accelerator module generates an error part-way into the Linux boot 
sequence (right after disk probing).

dmesg shows that shadow faulting the GDT is failing but that's occuring 
a bit before it bails out (according to the timestamps).

I can provide a script that can take a built Xen tree and launchs qemu 
with Xen automatically (you could provide an empty disk since it dies 
long before it mounts the disk).  It's not as simple as just passing a 
-kernel because Xen needs to be booted via multiboot.

Regards,

Anthony Liguori

>Paul
>
>  
>

Re: [Qemu-devel] kqemu in 0.7.2 no longer boots Xen

[Jim C. Brown]

On Mon, Sep 12, 2005 at 04:37:58PM -0500, Anthony Liguori wrote:
> 0.7.2 seems to have broken support for kqemu.

You are using both qemu 0.7.2 and kqemu 0.7.2 right? qemu 0.7.2 introduced
some incompatible changes and no longer works with older versions of kqemu.

-- 
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.

Re: [Qemu-devel] kqemu in 0.7.2 no longer boots Xen

[Anthony Liguori]

Jim C. Brown wrote:

>On Mon, Sep 12, 2005 at 04:37:58PM -0500, Anthony Liguori wrote:
>  
>
>>0.7.2 seems to have broken support for kqemu.
>>    
>>
>
>You are using both qemu 0.7.2 and kqemu 0.7.2 right? qemu 0.7.2 introduced
>some incompatible changes and no longer works with older versions of kqemu.
>  
>
Yup.

Regards,

Anthony Liguori