On Tue, Sep 15, 2015 at 03:19:25PM -0500, Major Hayden wrote:
> On 09/15/2015 03:03 PM, Cole Robinson wrote:
> > Anyone know how to get fedora + xen running in a KVM VM? I'd like to be able
> > to do basic xen/libxl/libvirt testing without needed to reboot a physical 
> > machine.
> > 
> > Trying with F23 AMD host, F22+xen L1, trying to boot into xen in the L1 VM
> > just reboots very soon after trying to boot the kernel. Tried disabling all
> > virtio for L1 VM, disabling virt extensions for the L1 VM, but it didn't 
> > seem
> > to change anything. Unfortunately the messages scroll by so quickly I can't
> > tell what's happening right before it reboots, and all efforts to convince 
> > it
> > to print more debugging haven't worked.
> > 
> > FWIW this does work with rhel5+xen L1, but that's a world away at this 
> > point.
> > 
> > So anyone know if it's even possible? Is there a trick to it? If not,
> > suggestions on getting more debug output from xen + grub2?
> 
> I've had a tubload of trouble with Xen 4.5 on Fedora 22.  However, you 
> *should* be able to boot a Xen hypervisor as a KVM guest.  It requires nested 
> virt on the host itself.  I'm not sure if AMD CPUs are capable of doing that, 
> but I've had luck with this on Intel Xeons (Nehalem and later).
> 
> If F22+Xen as a KVM guest isn't working out, you may need to try F21+Xen as a 
> guest and see if that works.
> a

It works great!

> Examples of the trouble I've had with Xen so far:
> 
>   https://bugzilla.redhat.com/show_bug.cgi?id=1219197
> 
> I usually end up following this page to get some serial output:
> 
>   http://wiki.xen.org/wiki/Xen_Serial_Console
> 
> Once you get some serial output and prevent Xen from rapidly power cycling, 
> you should get something moderately useful for troubleshooting on the 
> graphical or serial console.
> 
> The noreboot=true and sync_console options might help you troubleshoot, too:
> 
>   http://xenbits.xen.org/docs/4.2-testing/misc/xen-command-line.html
> 
> --
> Major Hayden
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