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 49FB6C64EC7 for ; Tue, 21 Feb 2023 19:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229626AbjBUTMA (ORCPT ); Tue, 21 Feb 2023 14:12:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229468AbjBUTL6 (ORCPT ); Tue, 21 Feb 2023 14:11:58 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0CA8B30B1E; Tue, 21 Feb 2023 11:11:34 -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=3OEWjiyzMl2pG8LRV3O7lueWlZQKsHY3A1b3qWEktBs=; b=rf5uoIPj6a+8INaHu5M7WX3UIo q5fIEHxQ+YFjSDnlKWbht9nm299bseHcKLqXgb2PSXwkAWZZLc3lwH6wOdIeEUJ+987XspJsKi8N9 +MCEq4DHLijCbiLaJpL6A9kJsdnCTz+Kay5RappIMhvR2sRbKcCjiahWUpRpiCpN9BVghLfOs2NTW 4+qRORx0VIrIEA7IIX4xFp5Z6CCEZKsN4tTsUJj63JaU5bmjOcbfEa0yicse4K4DbL/yMVERbfCjt UK3vTI8jMlk/hw7ISDPf2PypDhQKdqPtOR3lXPSM7iyMOIF9NuftB+Zop0IB0b8U7UdSx2CwSDfmc PKxiHFow==; 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 1pUY2R-00CqYh-Pf; Tue, 21 Feb 2023 19:10:56 +0000 Message-ID: Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64 From: David Woodhouse To: Oleksandr Natalenko Cc: Kim Phillips , tglx@linutronix.de, Usama Arif , arjan@linux.intel.com, 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, "Limonciello, Mario" , Piotr Gorski Date: Tue, 21 Feb 2023 19:10:54 +0000 In-Reply-To: <9153284c37a79d303aa79dbf07c10329@natalenko.name> References: <20230215145425.420125-1-usama.arif@bytedance.com> <2668869.mvXUDI8C0e@natalenko.name> <2a67f6cf18dd2c1879fad9fd8a28242918d3e5d2.camel@infradead.org> <982e1d6140705414e8fd60b990bd259a@natalenko.name> <715CBABF-4017-4784-8F30-5386F1524830@infradead.org> <67dbc69f-b712-8971-f1c9-5d07f506a19c@amd.com> <42dc683e2846ae8fc1e09715aaf7884660e1a386.camel@infradead.org> <37c18c3aeea2e558633b6da6886111d0@natalenko.name> <5A3B7074-0C6D-472B-803B-D76541828C1F@infradead.org> <3d8ed6e157df10c5175c636de0e21849@natalenko.name> <5c557f9b6f55dc2a612ee89142971298e6ae12d8.camel@infradead.org> <5b8f9c89f7015fa80c966c6c7f6fa259db6744f8.camel@infradead.org> <85ceb3f92abf3c013924de2f025517372bed19c0.camel@infradead.org> <3e5944de08ef0d23584d19bad7bae66c@natalenko.name> <26E5DC9C-0F19-4E4F-9076-04506A197374@infradead.org> <10CA27BB-ADC6-4421-86D2-A83BD7FA12E0@infradead.org> <9153284c37a79d303aa79dbf07c10329@natalenko.name> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-OeN2sLt7BB7srnVVcy8t" 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 --=-OeN2sLt7BB7srnVVcy8t Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-02-21 at 13:14 +0100, Oleksandr Natalenko wrote: >=20 > With this in place: >=20 > ``` > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0early_gdt_descr.address = =3D (unsigned long)get_cpu_gdt_rw(0); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0initial_gs =3D per_cpu_of= fset(0); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0smpboot_control =3D 0; > ``` >=20 > the resume does not work. Yeah, I think it's always running on CPU0 after the other CPUs are taken down anyway. We definitely *do* need to clear smpboot_control because we absolutely want it using the temp_stack we explicitly put into initial_stack, not finding its own idle thread. The problem was that it was never being restored to STARTUP_SECONDARY in the parallel modes, because that's a one-time setup in native_smp_prepare_cpus(). So we can just restore it in arch_thaw_secondary_cpus_begin() too, by working this into patch 6 of the series. (Usama, I think my tree is fairly out of date now so I'll let you do that? Thanks!). diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 50621793671d..3db77a257ae2 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1571,6 +1571,17 @@ void __init native_smp_prepare_cpus(unsigned int max= _cpus) =20 void arch_thaw_secondary_cpus_begin(void) { + /* + * On suspend, smpboot_control will have been zeroed to allow the + * boot CPU to use explicitly passed values including a temporary + * stack. Since native_smp_prepare_cpus() won't be called again, + * restore the appropriate value for the parallel startup modes. + */ + if (do_parallel_bringup) { + smpboot_control =3D STARTUP_SECONDARY | + (x2apic_mode ? STARTUP_APICID_CPUID_0B : STARTUP_APICID_CPUID_01); + } + set_cache_aps_delayed_init(true); } =20 --=-OeN2sLt7BB7srnVVcy8t Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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