[Xen-devel] Fam10+ extended config space enabling

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

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).

Thanks, Jan


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