linux-kernel - Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

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Message-ID: <874jpc3s3r.ffs@tglx>
Date:   Wed, 19 Apr 2023 15:43:20 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        David Woodhouse <dwmw2@...radead.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Brian Gerst <brgerst@...il.com>,
        Arjan van de Veen <arjan@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul McKenney <paulmck@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Piotr Gorski <lucjan.lucjanov@...il.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Usama Arif <usama.arif@...edance.com>,
        Jürgen Groß <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        "James E. J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Sabin Rapan <sabrapan@...zon.com>
Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

On Wed, Apr 19 2023 at 14:38, Thomas Gleixner wrote:
> On Wed, Apr 19 2023 at 11:38, Thomas Gleixner wrote:
> IOW, the BIOS assignes random numbers to the AP APICs for whatever
> raisins, which leaves the parallel startup low level code up a creek
> without a paddle, except for actually reading the APICID back from the
> APIC. *SHUDDER*

So Andrew just pointed out on IRC that this might be related to the
ancient issue of the 3-wire APIC bus where IO/APIC and APIC shared the
ID space, but that system is definitely post 3-wire APIC :)

Thanks,

        tglx