linux-kernel - Re: [patch V3 27/40] x86/cpu: Provide a sane leaf 0xb/0x1f parser

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Message-ID: <874jl1im56.ffs@tglx>
Date:   Mon, 14 Aug 2023 19:12:05 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Zhang, Rui" <rui.zhang@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "Brown, Len" <len.brown@...el.com>,
        "Gross, Jurgen" <jgross@...e.com>,
        "mikelley@...rosoft.com" <mikelley@...rosoft.com>,
        "arjan@...ux.intel.com" <arjan@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "ray.huang@....com" <ray.huang@....com>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "Sivanich, Dimitri" <dimitri.sivanich@....com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>
Subject: Re: [patch V3 27/40] x86/cpu: Provide a sane leaf 0xb/0x1f parser

On Mon, Aug 14 2023 at 15:28, Rui Zhang wrote:
> On Mon, 2023-08-14 at 14:26 +0200, Thomas Gleixner wrote:
>> What's the problem you are trying to solve? Some real world issue or
>> some academic though experiment which might never become a real
>> problem?
>> 
> Maybe I was misleading previously, IMO, I totally agree with your
> points, and "using optional die/tile/module" is what I propose to
> address these concerns.

That's exactly what's implemented. If module, tile, die are not
advertised, then you end up with:

        N   threads
        N/2 cores
        1   module
        1   tile
        1   die

in a package because the bits occupied by module, tile and die are
exactly 0.

But from a conceptual and consistency point of view they exist, no?

Thanks,

        tglx