Messages in this thread | | | Date | Tue, 21 Feb 2023 10:00:54 +0100 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH V2 0/1] x86: cpu topology fix and question on x86_max_cores |
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On Mon, Feb 20, 2023 at 11:49:45PM +0100, Thomas Gleixner wrote:
> > I thought of improving this by parsing all the valid APIC-IDs in MADT > > during BSP bootup, and get such information by decoding the APIC-IDs > > using the APIC-ID layout information retrieved from BSP. But this is > > likely to be a fertile new source of bugs as Dave concerned. > > The APIC-IDs are only usefull if there is an architected scheme how they > are assigned. Is there such a thing?
Isn't that given through CPUID? Or are we worried each CPU will have different values in the topology leafs?
We really should have added that CPUID uniformity sanity check a long while ago :-(
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