From patchwork Mon Oct 31 20:10:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Luck X-Patchwork-Id: 1697473 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.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=hH+8JOog; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4N1PRw4BKpz23lC for ; Tue, 1 Nov 2022 07:11:24 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4N1PRs1cqmz3cHs for ; Tue, 1 Nov 2022 07:11:21 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=hH+8JOog; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=intel.com (client-ip=134.134.136.20; helo=mga02.intel.com; envelope-from=tony.luck@intel.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=hH+8JOog; dkim-atps=neutral Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4N1PRR2CPwz30NS for ; Tue, 1 Nov 2022 07:10:53 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667247059; x=1698783059; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=gVin2FQfBiKKdgB/2PC5DT5M96qnAGhQxw1TWFWq2qw=; b=hH+8JOog47bM7cHRbLGIQK+pZ8PWM/bPri3g9ygdRdyCNuRRh8ydwVsb r1ySRZqQt9o07ks90NJodmK+bOHSySVFhWVxdgoAtdsaS1LkDCPPpzqDz IpELYxkgNqURkPCMKIGh6v7TQ9oSmeoEuAEHdvDLVzgIbZ4FwU0I/huFq Sk5sClJR/7DwRFTGUIJkj9BUR4ky3bXqp03pWou7nqW3GZQOHtk2mqw6H JhD8y0KiLfNdLU7sZUd/Bjiy6wZnazQd9OROdG0VslrxzKmGz6t6hq+ct GjxtHh7nb3TKerFErAMxKANUhP0rNmug3LMuzV9AQbBg7j6eJCf7DBTXl w==; X-IronPort-AV: E=McAfee;i="6500,9779,10517"; a="296408518" X-IronPort-AV: E=Sophos;i="5.95,228,1661842800"; d="scan'208";a="296408518" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Oct 2022 13:10:47 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10517"; a="722931438" X-IronPort-AV: E=Sophos;i="5.95,228,1661842800"; d="scan'208";a="722931438" Received: from agluck-desk3.sc.intel.com ([172.25.222.78]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Oct 2022 13:10:47 -0700 From: Tony Luck To: Andrew Morton Subject: [PATCH v4 0/2] Copy-on-write poison recovery Date: Mon, 31 Oct 2022 13:10:27 -0700 Message-Id: <20221031201029.102123-1-tony.luck@intel.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221021200120.175753-1-tony.luck@intel.com> References: <20221021200120.175753-1-tony.luck@intel.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Miaohe Lin , Tony Luck , Naoya Horiguchi , linux-kernel@vger.kernel.org, Matthew Wilcox , linux-mm@kvack.org, Alexander Potapenko , Shuai Xue , Nicholas Piggin , Dan Williams , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Recover from poison consumption while copying pages in the kernel for a copy-on-write fault. Changes since v3: 1) Miaohe Lin pointed out that a recent change by Alexander Potapenko to copy_user_highpage() added a call to kmsan_unpoison_memory(). Same is needed in my cloned copy_mc_user_highpage() ... at least in the successful case where the page was copied with no machine checks. 2) Picked up some additional Reviewed-by and Tested-by tags. Tony Luck (2): mm, hwpoison: Try to recover from copy-on write faults mm, hwpoison: When copy-on-write hits poison, take page offline include/linux/highmem.h | 26 ++++++++++++++++++++++++++ include/linux/mm.h | 5 ++++- mm/memory.c | 32 ++++++++++++++++++++++---------- 3 files changed, 52 insertions(+), 11 deletions(-) base-commit: 30a0b95b1335e12efef89dd78518ed3e4a71a763