[Qemu-devel] Re: Live Migration of 32-bit Linux guest broken since 2.6.35-rc2

[Avi Kivity]

On 06/09/2010 11:29 AM, Peter Lieven wrote:
> Avi Kivity wrote:
> > On 06/08/2010 04:44 PM, Peter Lieven wrote:
> > > > -cpu host is good if you have identical machines and don't plan to 
> > > > add new ones.
> > >
> > > i will likely add new ones, but my plan would be to use qemu64 and 
> > > then add all flags manually that
> > > are common to all cpus in the pool.
> > > would that be safe?
> >
> > Yes.
> 2 last questions:
>
> a) i remember that there (have been) are instructions that have a high 
> virtualization penalty.
> are there flags that should better not be offered to a VM?

Not that I know of.

> b) you told you fixed another bug in 2.6.35. is the nx virtualization 
> not working in guests
> before 2.6.35 and therefore my case worked with 2.6.34?

On 2.6.34, your guest lost nx protection after migration.  On 2.6.35, it 
died.

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