Re: x2APIC and many-APIC systems...

[Yinghai Lu]

On Tue, Mar 13, 2012 at 2:29 AM, Daniel J Blueman
<daniel@xxxxxxxxxxxxxxxxxx> wrote:
> Ingo, Suresh,
>
> Commit a35fd28256e7736cc84af8931a16224f0bfaaf6c prevents x2APIC structures
> being used from the ACPI MADT if the cores don't advertise the x2APIC
> feature. Commit c284b42abadbb22083bfde24d308899c08d44ffa prevents onlining
> cores with APIC ID >255 in non-x2APIC mode. Since NumaChip/NumaConnect uses
> x2APIC structures to describe non-x2APIC systems (AMD Opteron) with lots of
> APICs, we thus now can't boot all the cores.
>
> We are able to set the x2APIC bit in the processor feature flags, so get
> caught by the second patch. Is there an appropriate approach to use in these
> circumstances? Otherwise, would a patch that separates the APIC ID handover
> and future x2APIC MSR access be appropriate?
>

add is_apicid_valid() in struct apic?

Yinghai
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