Migrating from Xen 3.2 to KVM

Migrating from Xen 3.2 to KVM

[Mike Power]

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Hello,

I currently (I think) have XP installed on an LVM
volume /dev/mapper/vol_group1-windows.  I have been trying to power this
VM up on KVM (Ubuntu 8.10 dropped Xen).  Come to think of it I am not
even sure if the on disk format KVM expects is the same the Xen wrote to
disk.

What is the likely hood that I will succeed?

At this time using the attached config file I boot up into the windows
boot strap.  I immediately hit the safe mode menu.  Once I step pass the
safe mode menu then the vm reboots.  Known problem?

Mike Power

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Re: Migrating from Xen 3.2 to KVM

[Sheng Yang]

On Friday 09 January 2009 15:41:27 Mike Power wrote:
> Hello,
>
> I currently (I think) have XP installed on an LVM
> volume /dev/mapper/vol_group1-windows.  I have been trying to power this
> VM up on KVM (Ubuntu 8.10 dropped Xen).  Come to think of it I am not
> even sure if the on disk format KVM expects is the same the Xen wrote to
> disk.
>
> What is the likely hood that I will succeed?
>
> At this time using the attached config file I boot up into the windows
> boot strap.  I immediately hit the safe mode menu.  Once I step pass the
> safe mode menu then the vm reboots.  Known problem?
>
Hi Mike

Did you use some Xen specific driver in the image? If so, that's a problem... 
You can post dmesg here also.

>From the description above, I think you are using KVM distributed by Ubuntu? I 
checked KVM version from Ubuntu upstream, seems it's kvm-72, and now it's 
kvm-82... You can refer to http://kvm.qumranet.com/kvmwiki/HOWTO1 to try new 
KVM release.

-- 
regards
Yang, Sheng

Re: Migrating from Xen 3.2 to KVM

[Todd Deshane]

On Fri, Jan 9, 2009 at 2:41 AM, Mike Power <mpower@dodtsair.mine.nu> wrote:
> Hello,
>
> I currently (I think) have XP installed on an LVM
> volume /dev/mapper/vol_group1-windows.  I have been trying to power this
> VM up on KVM (Ubuntu 8.10 dropped Xen).  Come to think of it I am not
> even sure if the on disk format KVM expects is the same the Xen wrote to
> disk.
>
> What is the likely hood that I will succeed?
>
> At this time using the attached config file I boot up into the windows
> boot strap.  I immediately hit the safe mode menu.  Once I step pass the
> safe mode menu then the vm reboots.  Known problem?
>

Ubuntu recently updated their KVM docs, maybe some hints in there:
https://help.ubuntu.com/community/KVM

Also, Boris has some Ubuntu Xen Howtos, if you are simply looking to
upgrade Xen.
http://bderzhavets.blogspot.com/2009/01/setup-xen-3.html
http://bderzhavets.wordpress.com/2008/11/13/backport-intrepid-xen-33-hypervisor-at-ubuntu-hardy-dom0-2624-21-xen/

Hope that helps.

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

Re: Migrating from Xen 3.2 to KVM

[Avi Kivity]

Mike Power wrote:
> Hello,
>
> I currently (I think) have XP installed on an LVM
> volume /dev/mapper/vol_group1-windows.  I have been trying to power this
> VM up on KVM (Ubuntu 8.10 dropped Xen).  Come to think of it I am not
> even sure if the on disk format KVM expects is the same the Xen wrote to
> disk.
>
>   

If you're using an lvm volume. the on-disk format is the same.

> What is the likely hood that I will succeed?
>   

I'm surprised it failed -- kvm and Xen use the same device model (qemu) 
so they should be highly compatible.

> At this time using the attached config file I boot up into the windows
> boot strap.  I immediately hit the safe mode menu.  Once I step pass the
> safe mode menu then the vm reboots.  Known problem?
>   

Anything interesting in dmesg?  Any Xen specific drivers installed?

-- 
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