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 CC50AEB64DD for ; Mon, 3 Jul 2023 09:19:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230090AbjGCJTc (ORCPT ); Mon, 3 Jul 2023 05:19:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229644AbjGCJTa (ORCPT ); Mon, 3 Jul 2023 05:19:30 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9840018D; Mon, 3 Jul 2023 02:19:29 -0700 (PDT) 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=SGJKKlGPHOOO++xI1ULSrW0mAjDOrbHmkxIaOKoddPI=; b=VuVjK31kSCz1duS2onqd9u5Rsl 8C+Qbwt7+6JMMwiQEFQPW/uqVYXGekqN6HBtj95A15MwxAf+y/9gt+LXfW7IjepxYDQmHwuyzEgiR 9UPMbVM7Su7YdqCAq8B1jjmxg0v8CbwGzyB3GAimQZuR2GeMsLqEc/wvCHTOY+C8smw4/lLp29erB xALaaV9pDddh3Xa9fBx86XvTbPzbp/AgfL30j3DVnCXXmJKxjPRUUpVxMXDReTd9tv4a+tiT5xYQH jUDPHy4GNrin5aD+lbzGUdY6vQemH5U7OG4kGo0LqXaT4bjBBp5qe0ss32LiZTpONzr5GVCE/J4dG 6mLPGPHw==; Received: from [2001:8b0:10b:5:86a3:26f9:cd4a:d44b] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qGFiO-0085rM-MF; Mon, 03 Jul 2023 09:19:24 +0000 Message-ID: <937d902965db22fa54668c985a09dc4c07dbb0b1.camel@infradead.org> Subject: Re: [EXTERNAL] [PATCH AUTOSEL 6.4 02/15] x86/smpboot: Implement a bit spinlock to protect the realmode stack From: David Woodhouse To: Sasha Levin , linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Gleixner , Peter Zijlstra , Michael Kelley , Oleksandr Natalenko , Helge Deller , "Guilherme G . Piccoli" , mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, usama.arif@bytedance.com, brgerst@gmail.com, jgross@suse.com, jpoimboe@kernel.org, thomas.lendacky@amd.com Date: Mon, 03 Jul 2023 10:19:23 +0100 In-Reply-To: <20230702194020.1776895-2-sashal@kernel.org> References: <20230702194020.1776895-1-sashal@kernel.org> <20230702194020.1776895-2-sashal@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-FpwvptRCF8S1OMYGfgb3" 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 --=-FpwvptRCF8S1OMYGfgb3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2023-07-02 at 15:40 -0400, Sasha Levin wrote: > From: Thomas Gleixner >=20 > [ Upstream commit f6f1ae9128d2a080ecdd55f85e8a0ca3ed1d58eb ] >=20 > Parallel AP bringup requires that the APs can run fully parallel through > the early startup code including the real mode trampoline. >=20 > To prepare for this implement a bit-spinlock to serialize access to the > real mode stack so that parallel upcoming APs are not going to corrupt ea= ch > others stack while going through the real mode startup code. This is also preparation for the parallel CPU bringup and (again, unless I'm missing something) doesn't need to be backported to stable. --=-FpwvptRCF8S1OMYGfgb3 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 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