From patchwork Wed Sep 11 18:09:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philip Cox X-Patchwork-Id: 1984161 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com (client-ip=185.125.189.65; helo=lists.ubuntu.com; envelope-from=kernel-team-bounces@lists.ubuntu.com; receiver=patchwork.ozlabs.org) Received: from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4X3pZH3myJz1y1S for ; Thu, 12 Sep 2024 04:12:23 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=lists.ubuntu.com) by lists.ubuntu.com with esmtp (Exim 4.86_2) (envelope-from ) id 1soRp5-0005xl-Kk; Wed, 11 Sep 2024 18:12:11 +0000 Received: from smtp-relay-internal-1.internal ([10.131.114.114] helo=smtp-relay-internal-1.canonical.com) by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1soRp4-0005xb-4X for kernel-team@lists.ubuntu.com; Wed, 11 Sep 2024 18:12:10 +0000 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id E27713F174 for ; Wed, 11 Sep 2024 18:12:09 +0000 (UTC) Received: by mail-io1-f70.google.com with SMTP id ca18e2360f4ac-82ce11bc50eso22283439f.0 for ; Wed, 11 Sep 2024 11:12:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726078327; x=1726683127; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=29auSIgdmrbxsOQZ9z5SAHlWb5NUlXqMJ758GjmhC74=; b=VQRpjo/ClZNmApuOAq0uku10CFrC2GaVC6MJdyL+ycf9ggDADvecc3z+uu7tEMU3Va P/vo7ld7XjyX6dBqMjUYlC4eDS3otTfwPew2n5t2iBWQ91KM2iQaffGLR9ctAcytw0B7 XENK75WSUYdjcL5VFOQtygq9IsqxatSi2hcu4/ylG4ECErzZMCTxsakN+0YZPqGVFpTW HrKL2I1+CtAUWoIW/NpWWCz8e6C0XsOS5INvtklNHA279oOjDSWnMFX/ArlDwP6ydxYi ZG1vGnujsUYAyid8rE3nFjtT35s64fZAV9vd8tnuO3HsxK7BOPe79BcZanZDffZIALbg qCDQ== X-Gm-Message-State: AOJu0YzQ+LloMoHbN8WcmloAsb6T7ZKsHic9Dex/4XGtwJXpJZ2FzkiF 3Spn8TDdeLGpt4jYv9jcL3rl4sljcnzeNwwxwRqRn/GU8mpiAa3b77BGNy8naysw9GjG2n10zwL IGJyNO9SSuJWqktBmf98Uv2JrEzOly33p/I+Xrurb95wB6Uqol/DXS4QBdHnVI7lFYl2csbukhu P4J6/f638+bA== X-Received: by 2002:a05:6602:6d14:b0:82c:f43f:bafe with SMTP id ca18e2360f4ac-82d1f8dae02mr58265939f.8.1726078327570; Wed, 11 Sep 2024 11:12:07 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGne623mEG3S03KL5i271m0cBoXSmxSWKW7TfnKhYstz2B+jVjmgNPafQEAInXgJaWxz67j9Q== X-Received: by 2002:a05:6602:6d14:b0:82c:f43f:bafe with SMTP id ca18e2360f4ac-82d1f8dae02mr58263139f.8.1726078327118; Wed, 11 Sep 2024 11:12:07 -0700 (PDT) Received: from cox.home.arpa ([174.91.65.196]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4d35f43447fsm116962173.30.2024.09.11.11.12.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Sep 2024 11:12:05 -0700 (PDT) From: Philip Cox To: kernel-team@lists.ubuntu.com Subject: [PATCH 0/1] [N][linux-aws]Backport x86/kaslr fix impacting ML/HPC workloads Date: Wed, 11 Sep 2024 14:09:51 -0400 Message-Id: <20240911180952.21076-1-philip.cox@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" BugLink: https://bugs.launchpad.net/bugs/2080414 SRU Justification: [Impact] EC2 team discovered a Linux bug during ML/HPC workload testing on P5 instances. The issue is described at https://lore.kernel.org/all/87ed6soy3z.ffs@tglx/ ("iounmap() on x86 occasionally fails to unmap because the provided valid ioremap address is not below high_memory."). [Fix] This is fixed by upstream commit ea72ce5da22806d5713f3ffb39a6d5ae73841f93: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea72ce5da22806d5713f3ffb39a6d5ae73841f93 [Test Plan] AWS tested [Where problems could occur] If there was code that made incorrect assumptions on how memory was laid out and used, it might break the functionality, but seeing as this is fixing an error, the chances of that should be fairly low. [Other Info] SF #00392654 Acked-by: Thibault Ferrante Acked-by: Cengiz Can