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 ED15DC61DA4 for ; Thu, 2 Feb 2023 10:07:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232526AbjBBKHX (ORCPT ); Thu, 2 Feb 2023 05:07:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229671AbjBBKHV (ORCPT ); Thu, 2 Feb 2023 05:07:21 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A35196EAC0; Thu, 2 Feb 2023 02:07:19 -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=zazcIZWTS106UY5KbWguJvMoPbEyZL7+9aLHdaTrA5M=; b=e2zGNQjFp6ohv0EK/GXZstSYME m+yzIIXS4s45wFH8AIfMEKlqBITvIUhaYYjep67O0gIXFOABb0Sk8gVvY5BMEKhk+7V0Tq6YEHJzl DVf1OS0p+lQxuz3OD1VrpVW7CUkG07xHDMOAuoTMJD9p3JAuvddl0EuQvauPVribTs+EaITYUxAgD zYS6ZmusKfZiBRWQwEQrxNBOcJr1qXDVF/NrOEI0WX3m3eAMBr9QAdOEuCrpsjiR+R6ql2wuapovv 9VrfXEuWi7hnD+gJI0J7/6IU+LlQKYPXqneiMTgnrBmDPlFcwt+pAV+X2ACv0dYOBYmyJEh/fyXlv 9YLptbAw==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pNWUa-00DHvA-UL; Thu, 02 Feb 2023 10:06:57 +0000 Message-ID: Subject: Re: [External] Re: [PATCH v4 0/9] Parallel CPU bringup for x86_64 From: David Woodhouse To: "H. Peter Anvin" , Usama Arif , Thomas Gleixner Cc: Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Paolo Bonzini , "Paul E . McKenney" , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com, hushiyuan@huawei.com, luolongjun@huawei.com, hejingxian@huawei.com, Tom Lendacky , Sean Christopherson , Paul Menzel , Fam Zheng , Punit Agrawal , simon.evans@bytedance.com, liangma@liangbit.com Date: Thu, 02 Feb 2023 10:06:55 +0000 In-Reply-To: <4C7F2481-0B0B-4399-A8E1-30731EFD02D2@zytor.com> References: <20220201205328.123066-1-dwmw2@infradead.org> <1d0ed92ab68409b62a14cd29d0021f92c6e2568a.camel@infradead.org> <7fda05c9-9d4a-6005-0ce5-91bda1bb06c1@bytedance.com> <4C7F2481-0B0B-4399-A8E1-30731EFD02D2@zytor.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-908WNcSLOvTrr71TRNtV" 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 --=-908WNcSLOvTrr71TRNtV Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-02-01 at 08:55 -0800, H. Peter Anvin wrote: > This should be a CPU bug flag in my option. This is in the tree that I've just rebased to v6.2-rc6 for Usama to continue testing and repost as appropriate. (Oh, as I post it in email I realise we should probably retcon the explicit check for AMD out of the previous patch in the series. You can see it being *removed* in this patch.) =46rom 1f7cece1241e5b9c9988f943962155bb7154d4f8 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Thu, 2 Feb 2023 09:53:26 +0000 Subject: [PATCH 07/15] x86/smpboot: Disable parallel boot for AMD CPUs Signed-off-by: David Woodhouse --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kernel/cpu/amd.c | 11 +++++++++++ arch/x86/kernel/smpboot.c | 9 +++++++-- 3 files changed, 19 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpuf= eatures.h index 61012476d66e..ed7f32354edc 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -466,5 +466,6 @@ #define X86_BUG_MMIO_UNKNOWN X86_BUG(26) /* CPU is too old and its MMIO S= tale Data status is unknown */ #define X86_BUG_RETBLEED X86_BUG(27) /* CPU is affected by RETBleed */ #define X86_BUG_EIBRS_PBRSB X86_BUG(28) /* EIBRS is vulnerable to Post Ba= rrier RSB Predictions */ +#define X86_BUG_NO_PARALLEL_BRINGUP X86_BUG(29) /* CPU has hardware issues= with parallel AP bringup */ =20 #endif /* _ASM_X86_CPUFEATURES_H */ diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index f769d6d08b43..19b5c8342d7e 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -941,6 +941,17 @@ static void init_amd(struct cpuinfo_x86 *c) case 0x19: init_amd_zn(c); break; } =20 + /* + * Various AMD CPUs appear to not to cope with APs being brought up + * in parallel. In debugging, the AP doesn't even seem to reach an + * outb to port 0x3f8 right at the top of the startup trampoline. + * We don't *think* there are any remaining software issues which + * may contribute to this, although it's possible. So far, attempts + * to get AMD to investigate this have been to no avail. So just + * disable parallel bring up for all AMD CPUs for now. + */ + set_cpu_bug(c, X86_BUG_NO_PARALLEL_BRINGUP); + /* * Enable workaround for FXSAVE leak on CPUs * without a XSaveErPtr feature diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 7920823d5a3b..95c182023d09 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1538,9 +1538,14 @@ void __init native_smp_prepare_cpus(unsigned int max= _cpus) * it for all AMD CPUs to be on the safe side. */ if (IS_ENABLED(CONFIG_X86_32) || boot_cpu_data.cpuid_level < 0x0B || - cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT) || - boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_AMD) + cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) { 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"); + do_parallel_bringup =3D false; + } =20 snp_set_wakeup_secondary_cpu(); } --=20 2.39.0 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