linux-kernel - Re: [patch V3 12/60] x86/of: Fix the APIC address registration

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Message-ID: <973ae60f-15cd-19a3-7314-d165696b833c@intel.com>
Date:   Thu, 3 Aug 2023 15:42:15 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Andrew Cooper <andrew.cooper3@...rix.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wei Liu <wei.liu@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Juergen Gross <jgross@...e.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Peter Keresztes Schmidt <peter@...esztesschmidt.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [patch V3 12/60] x86/of: Fix the APIC address registration

On 8/1/23 03:46, Thomas Gleixner wrote:
> The device tree APIC parser tries to force enable the local APIC when it is
> not set in CPUID. apic_force_enable() registers the boot CPU apic on
> success.

I went looking for how this registration happens.  I was expecting to
see something apic_force_enable() do something similar to
register_lapic_address().

But the apic_force_enable()=>apic_verify() call chain is pretty shallow
and I'm not seeing a lot of overlap.

Am I reading the "registers" part of this too literally?