Re: [Qemu-devel] Are VM snapshots on Ubuntu host compatible with Fedora host?

[David Barrett <dbarrett@quinthar.com>]

Anthony Liguori wrote:
> David Barrett wrote:
>> Following up on this, I created a brand-new WinXP image from scratch 
>> (on my Ubuntu box), uploaded to my headless Fedora box, and it still 
>> has the  exact same crash:
>>
>> qemu: warning: error while loading state for instance 0x0 of device 'ram'
>> qemu: fatal: triple fault
>>
>> So is it safe to say that QEMU VM snapshots are not transferable 
>> between hosts?
> 
> KVM images are not compatible with QEMU.  If one of your servers is 
> running KVM, that's likely your problem.

Ahh, very interesting.

Just to make sure I understand correctly, this means VM snapshots made 
when QEMU has KQEMU enabled will not transfer between machines, right?

Or do you mean that the *whole image* (the entire qcow2) cannot be 
transferred?

I ask because now that I've got VNC working on my headless server, I 
note that my XP guest -- despite being started from a binary identical 
image that works fine on my Ubuntu host -- immediately and infinitely 
BSoDs on startup.

I assumed (perhaps incorrectly) that the same QEMU XP image would work 
across multiple hosts, even those with different processors and 
motherboards.  Am I misunderstanding this?

(Just for grins I even converted the qcow2 image to raw, to filter out 
any special qcow2 issues.  No effect.)

-david