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 8060CC6379F for ; Tue, 7 Feb 2023 11:27:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229512AbjBGL14 (ORCPT ); Tue, 7 Feb 2023 06:27:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230354AbjBGL1x (ORCPT ); Tue, 7 Feb 2023 06:27:53 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B251E8A7E; Tue, 7 Feb 2023 03:27:51 -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=apLf+sbjLK+sSLLDB0nN/3blFMPyvroDzl04yUCr5T8=; b=c3G+X3NtjSvHiPu3Xuh1yWzMMO WC/Cotdo8hBlYr59wsxj0y50m5+y/rqYdfDFDPK5YAaEZfZqjLIVWLMwJWaz+iX5i8cE8lBEDACdl 4WHQuxLuchSMAyuLl/DvcK3YYDWoDIJscJLFsyHVlmPhq8GKQcVU/OvYNCcPvCloeg98BsQBaxBO6 NcvMiuallTACkQQUKz0E96GPzLrpvBpy3N4wVONqEjyjm4NfhunqwA3ZKbqDOGiQVjk6sVspJUnZC G2WZoUqHN6TqMop4ln2MLtW4ia04GYJHcEZU7Al1zTxILPkRBE/97amfWwAiUcjZv8lIEmSefDlE4 Jo+nfn7w==; 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 1pPM89-0006sJ-5C; Tue, 07 Feb 2023 11:27:21 +0000 Message-ID: <921cfe295fcd398168e5454e01193045de312688.camel@infradead.org> Subject: Re: [PATCH v6 01/11] x86/apic/x2apic: Fix parallel handling of cluster_mask From: David Woodhouse To: Thomas Gleixner , Usama Arif , 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 Date: Tue, 07 Feb 2023 11:27:20 +0000 In-Reply-To: References: <20230202215625.3248306-1-usama.arif@bytedance.com> <20230202215625.3248306-2-usama.arif@bytedance.com> <87a61qxtx0.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-g5Zc/zoCM36Kyb2oKOzS" 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 --=-g5Zc/zoCM36Kyb2oKOzS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-02-07 at 10:57 +0000, David Woodhouse wrote: >=20 > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * On post boot hotplug iter= ate over the present CPUs to handle the > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * case of partial clusters = as they might be presented by > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * virtualization. > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0for_each_present_cpu(cpu_i) = { >=20 >=20 > So... if this CPU was *present* at boot time (and if any other CPU in > this cluster was present), it will already have a cluster_mask. >=20 > Which means we get here in two cases:=20 >=20 > =C2=A0=E2=80=A2 This CPU wasn't actually present (was just 'possible') at= boot time. > =C2=A0=C2=A0 (Is that actually a thing that happens?) >=20 > =C2=A0=E2=80=A2 This CPU was present but no other CPU in this cluster was= actually > =C2=A0=C2=A0 brought up at boot time so the cluster_mask wasn't allocated= . >=20 > The code looks right, I don't grok the comment about partial clusters > and virtualization, and would have worded it something along the above > lines? As I get my head around that, I think the code needs to change too. What if we *unplug* the only CPU in a cluster (present=E2=86=92possible), t= hen add a new one in the same cluster? The new one would get a new cluster_mask. Which is kind of OK for now but then if we re-add the original CPU it'd continue to use its old cluster_mask. Now, that's kind of weird if it's physical CPUs because that cluster is within a given chip, isn't it? But with virtualization maybe that's something that could happen, and it doesn't hurt to be completely safe by using for_each_possible_cpu() instead? Now looks like this: /* * On post boot hotplug for a CPU which was not present at boot time, * iterate over all possible CPUs (even those which are not present * any more) to find any existing cluster mask. */ for_each_possible_cpu(cpu_i) { --=-g5Zc/zoCM36Kyb2oKOzS 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 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