Re: [Xen-devel] [PATCH RFC 2/2] linux/vnuma: Enables NUMA support for PV guest

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Aug 27, 2013 at 02:35:18PM +0100, David Vrabel wrote:
> On 27/08/13 09:53, Elena Ufimtseva wrote:
> > Enables NUMA support for PV guest and uses vNUMA
> > interface to discover topology provided by XEN.
> > 
> > Signed-off-by: Elena Ufimtseva <ufimtseva@xxxxxxxxx>
> > ---
> >  arch/x86/xen/setup.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
> > index 056d11f..7e0c93b 100644
> > --- a/arch/x86/xen/setup.c
> > +++ b/arch/x86/xen/setup.c
> > @@ -561,6 +561,6 @@ void __init xen_arch_setup(void)
> >     WARN_ON(xen_set_default_idle());
> >     fiddle_vdso();
> >  #ifdef CONFIG_NUMA
> > -   numa_off = 1;
> > +   numa_off = 0;
> >  #endif
> >  }
> 
> Hmm. This is either safe to turn on now or it will break on hosts
> without vNUMA support as it will cause a fallback to try all the
> hardware specific NUMA initialization.
> 
> Which is it?

It will blow up when booting as dom0 on certain AMD machines.

> 
> David
> 
> 
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