Re: [Xen-devel] [PATCH] x86/apic: remove DMI checks in bigsmp driver for obsolete systems

[Matt Wilson <msw@xxxxxxxxxx>]

On Wed, Aug 28, 2013 at 08:25:08PM +0100, Andrew Cooper wrote:
> On 28/08/13 19:59, Matt Wilson wrote:
> > The DMI checks that force the use of the bigsmp APIC driver are for
> > systems that are no longer supported by Xen (32-bit x86).
> >
> > Signed-off-by: Matt Wilson <msw@xxxxxxxxxx>
> > Cc: Keir Fraser <keir@xxxxxxx>
> > Cc: Jan Beulich <jbeulich@xxxxxxxx>
> > Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 
> I did some googling.
> 
> While the two HP machines do indeed only support 32bit cpus (Intel
> 'Gallatin' series),
> 
> http://www.serverwatch.com/hreviews/article.php/3655386
> 
> indicates that the ES7000/ONE can be configured with 64bit Xeon CPUs,
> and is therefore still supported by Xen.

Indeed. I'm hoping that such systems would be setting the clustered
APIC flag in FADT, which would have the same effect. I've added some
@unisys.com email addresses from past discussions.

--msw

> >  static __init int probe_bigsmp(void)
> >  { 
> >     /*
> > @@ -47,8 +20,7 @@ static __init int probe_bigsmp(void)
> >     if (acpi_gbl_FADT.flags &
> >         (ACPI_FADT_APIC_CLUSTER | ACPI_FADT_APIC_PHYSICAL))
> >             def_to_bigsmp = 1;
> > -   else if (!def_to_bigsmp)
> > -           dmi_check_system(bigsmp_dmi_table);
> > +
> >     return def_to_bigsmp;
> >  } 
> >  
> 

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