From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8B30C77B75 for ; Wed, 19 Apr 2023 13:43:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233248AbjDSNn0 (ORCPT ); Wed, 19 Apr 2023 09:43:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233226AbjDSNnZ (ORCPT ); Wed, 19 Apr 2023 09:43:25 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F914146EA; Wed, 19 Apr 2023 06:43:23 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1681911801; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jFu1BiBIiZJxXn+1gDPlWVAOg5qQuCy99rAdIveUYFI=; b=GioJJVLP3xsJ8meXcrDWG5s5gdc8c0v+E+hPsGfax24KRpT161PXreAJ6xSi1/ffGHB7Ig QiBx1CCi33pppdwmwttJl7f18G3nqG0JMirkvI2B/KLs1tu2KE0oys4tguZIBjdpC698x5 qJxDi+HpdhZXd4d+95gQdCA+EcnPYPHRun+2UdCS7FOBBh/HuWgOjO1wzT9vOvsEMfGXhZ Bp60sCQp4nsgLMYaR72tlHdyX8qr1HW2HBQ6txx5eUn8Q1HfGVvmcQX/+2gPF1pOlVbSvA J67MiipF05Kzmx+7IpQU6gIRKBAfRvBEfF5UQtkBc9rk1oQMLK4aT2yGkLma2g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1681911801; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jFu1BiBIiZJxXn+1gDPlWVAOg5qQuCy99rAdIveUYFI=; b=PpcgZgskhULkL7/jgakP7Wurg7G56yGaYp+uPBAUp/opltoRjM69gQ7OhILB+Kv0LHnaHA BEEUccjsOmhHz0CA== To: Paul Menzel Cc: linux-kernel@vger.kernel.org, x86@kernel.org, David Woodhouse , Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , "Guilherme G. Piccoli" , Piotr Gorski , David Woodhouse , Usama Arif , =?utf-8?B?SsO8cmdlbiBHcm/Dnw==?= , Boris Ostrovsky , xen-devel@lists.xenproject.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Guo Ren , linux-csky@vger.kernel.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, "James E. J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Mark Rutland , Sabin Rapan Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup In-Reply-To: <877cu83v45.ffs@tglx> References: <20230414225551.858160935@linutronix.de> <8247ce4d-15b7-03b2-0c9b-74f8cd6cad50@molgen.mpg.de> <87wn2a4la5.ffs@tglx> <87ttxd4qxz.ffs@tglx> <87r0sh4m7a.ffs@tglx> <8592a301-9933-1cad-bd61-8d97e7c7493b@molgen.mpg.de> <87a5z443g2.ffs@tglx> <877cu83v45.ffs@tglx> Date: Wed, 19 Apr 2023 15:43:20 +0200 Message-ID: <874jpc3s3r.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org 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