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

["Aravindh Puthiyaparambil (aravindp)" <aravindp@xxxxxxxxx>]

> > > 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.

I should know the answer to the question as I got Xen running on those systems 
but I don't remember :-) Some ES7000s ran in clustered APIC mode while some of 
the later models could run in physical flat mode. I have CCed Natalie 
Protasevich who might remember.

Thanks,
Aravindh

> > >  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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