Re: [Xen-devel] Fam10+ extended config space enabling

[Keir Fraser <keir@xxxxxxx>]

On 06/01/2011 10:15, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

> Robert,
> 
> starting with 2.6.27 Linux is doing this, using MSR accesses (these
> days in CPU hotplug notification callbacks). Is there a reason this
> cannot be done through PCI config space writes (as the register is
> aliased), and then only once at boot time (perhaps utilizing some
> of the code in arch/x86/kernel/k8.c)?
> 
> I'm particularly asking from the Xen perspective, where the MSR
> based mechanism won't reliably work (since there's no guarantee
> all of Dom0's virtual CPUs would, at initialization time, actually
> cover all physical CPUs that Dom0 may ever run on).

Just thinking, could we simply do this in Xen, either unconditionally, or as
soon as we detect dom0 doing it for at least one CPU?

 -- Keir

> Thanks, Jan
> 
> 
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