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SubjectRe: This combination of AMDprocessors is not suitable for SMP?
Michael Tokarev wrote:
> (yes there's no typo in $subject, it's an old formatting
> bug in printk).
>
> When booting kvm guest on an AMD CPU, guest kernel prints
> this warning:
>
> WARNING: This combination of AMDprocessors is not suitable for SMP.
>
> be it SMP or UP guest. What's wrong with this "combination",
> and can it be fixed?
The qemu64 CPU model KVM injects into the guest lets it see an AMD K7
with 64bit extension. Only some AMD K7 (Athlon-MP) were certified for
SMP support, so this code warns the user about an unsupported hardware.
When running KVM you can ignore this warning, as it only applies to
non-KVM capable processors and has no meaning for virtual SMP anyway.

If you like this warning to disappear, you can use "-cpu host" (and
probably loose migration capability) or wait for the new safe64 CPU
type, which will use family 15 instead of 6.

Regards,
Andre.

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448 3567 12
----to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Thomas M. McCoy; Giuliano Meroni
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632



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