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 AB58BC636CD for ; Sat, 4 Feb 2023 10:10:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233583AbjBDKKR (ORCPT ); Sat, 4 Feb 2023 05:10:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233625AbjBDKJx (ORCPT ); Sat, 4 Feb 2023 05:09:53 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 338226A716; Sat, 4 Feb 2023 02:09:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rkdS3e/CDXt4ULzF7aE5UQVsl0abBhAiBhvW4qfc3iM=; b=Tt/vvhhSyB01gGgGii/I8IO9Df I4TRNIYUlgw8/IK7uR1C6RT2wmO82BlRQY4PFqrl4Q35Tggle+2/77HddGxDmj3NRXXbLdN5D0LLU qcgZrXA9apzmfELnfXc8qqGYONocNdRV0zQWob/zk7fw7ZuZ9x5LT9AJBfD8PFHhW23RLXrMBxNtv Pqx/aCaGC+Jy4BxLzKGXFc6BjMuBNeqcI3Q62p9gxKAluZH+wz2jlZkXrFbk2ZFVEDlh4jfkrkL8R 0tpQZkY63PVgHc0lBDW1fn6ncKfZLwClmzMI9tP5QuQKfG53Vzr/+9L6JwAYs0fu2b3bF1R81yV+g oJgtoEWw==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pOFTh-00F5b8-IY; Sat, 04 Feb 2023 10:09:02 +0000 Message-ID: <675d56c5e9dbbe32a0142a3a5290b0c35c52c568.camel@infradead.org> Subject: Re: [PATCH v6 07/11] x86/smpboot: Disable parallel boot for AMD CPUs From: David Woodhouse To: Kim Phillips , Usama Arif , tglx@linutronix.de, arjan@linux.intel.com Cc: mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com, pmenzel@molgen.mpg.de, fam.zheng@bytedance.com, punit.agrawal@bytedance.com, simon.evans@bytedance.com, liangma@liangbit.com, Mario Limonciello Date: Sat, 04 Feb 2023 10:09:00 +0000 In-Reply-To: References: <20230202215625.3248306-1-usama.arif@bytedance.com> <20230202215625.3248306-8-usama.arif@bytedance.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-SFrINvRE+lDv0B/prUnO" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-SFrINvRE+lDv0B/prUnO Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2023-02-03 at 13:48 -0600, Kim Phillips wrote: > [=C2=A0=C2=A0=C2=A0 3.204580] [Firmware Bug]: CPU0: APIC id mismatch. Fir= mware: 0 > APIC: 2 Could it just be that some processors have CPUID leaves above 0xb but don't actually support 0xb? What does this do? --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1578,6 +1578,18 @@ void __init native_smp_prepare_cpus(unsigned int max= _cpus) cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) do_parallel_bringup =3D false; =20 + if (do_parallel_bringup) { + /* Check that CPUID 0x0B really does look sane. */ + unsigned int eax, ebx, ecx, edx; + + cpuid_count(0xb, 0, &eax, &ebx, &ecx, &edx); + printk("CPUID 0xB level 0: %x %x %x %x\n", eax, ebx, ecx, edx); + if (!eax && !ebx) { + pr_info("Disabling parallel bringup because CPUID 0xb looks untrustwort= hy\n"); + do_parallel_bringup =3D false; + } + } + if (do_parallel_bringup && boot_cpu_has_bug(X86_BUG_NO_PARALLEL_BRINGUP)) { pr_info("Disabling parallel bringup due to CPU bugs\n"); --=-SFrINvRE+lDv0B/prUnO Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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