On  xen-ia64-devel-boun...@lists.xensource.com wrote:
> Hi,
> When I try recently Xen (Xen 3.4 rc3) on IA64 machine
> (Tiger4), I found some strange issue.
> My two systems have 4 and 8 pcpus separately
> If VTI guest's vcpus is near pcpus, guest booting will meet
> some issues:
> 1. Guest boot might be hang at "switch to new root and run
> init; unmounting old /dev ...; unmounting old /sys" for a long time.
> 2. After guest boot up, it might report "illegal instructions"
> for command or report "readonly filesystem".
> I didn't catch it in UP or 2 vcpus conditions.
> Looks a qemu issue? Did you meet it also?

If I double vcpus ( 2*pcups), this issue is more easy to happen. I didn't try 
multi guest yet. 

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