From patchwork Mon Nov 9 16:24:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 11891787 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A9E916A2 for ; Mon, 9 Nov 2020 16:24:39 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6831D21D46 for ; Mon, 9 Nov 2020 16:24:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="1Ir7Zuup"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="FlK7ALOw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6831D21D46 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=oBeqlWI3H+Z1S4GaRp6Ss62DDwAffoVqL7eiusV3V5g=; b=1Ir7ZuupPPefRsCNF3FxVHvVAY NHkUmqiRC8woojIVo23smeViS4e8kvqUuFdJUCkB90l1YUSxbvfUidvCLUoOB7waiLdKzcU2VAZ8t 9/RxpwoGYsRK1VsKY807VP1UqiCiZwUV362Olx58tDPEYilL3rtSaxwUouIpo2nHSIwawXNyfQP1+ OjEPyDK6blkSbv36W07FCI0FCneJ5/2O7hF3K8pAePluD5hnqwMIfj5jQE6jhHFb8+V/tZ3t75m8A BTv5rp9RmT43TiBvcNcBItI+ypUQ9gF2uH2qmUIopKFDbTzIN8a5Hh7KC/CPnWzLoFDFh33ue6twT Y1ch0xPA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kc9y8-0001mz-VV; Mon, 09 Nov 2020 16:24:37 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kc9y2-0001km-Vy; Mon, 09 Nov 2020 16:24:32 +0000 Received: from aquarius.haifa.ibm.com (nesher1.haifa.il.ibm.com [195.110.40.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 726A920897; Mon, 9 Nov 2020 16:24:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604939070; bh=QI/S2bKonE9QPk2rHnaHhCHzH5i3UX6jhCE4bfOQNYQ=; h=From:To:Cc:Subject:Date:From; b=FlK7ALOwN5RaezegimQIhwgT4B7iWXxCejJvk9ueUltK0GfO8CYsgRF6m3jUNGW46 rORXhX9eUX2aIhxthymY4Bv+kdsa0ju6iCooGI6kWrsFkSPcDQOiaMHbCTY+D6Ur3s Jufmhn49c0P5H+hfaQbDU9+xK9tgyxK994Lm8tRQ= From: Mike Rapoport To: Andrew Morton Subject: [PATCH v6 0/4] arch, mm: improve robustness of direct map manipulation Date: Mon, 9 Nov 2020 18:24:11 +0200 Message-Id: <20201109162415.13764-1-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201109_112431_237773_29F609F6 X-CRM114-Status: GOOD ( 16.13 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_HIGH DKIMwl.org - High trust sender X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Hildenbrand , Peter Zijlstra , Benjamin Herrenschmidt , Dave Hansen , linux-mm@kvack.org, Paul Mackerras , Pavel Machek , "H. Peter Anvin" , sparclinux@vger.kernel.org, Christoph Lameter , Will Deacon , linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, Mike Rapoport , Christian Borntraeger , Ingo Molnar , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Len Brown , Albert Ou , Vasily Gorbik , linux-pm@vger.kernel.org, Heiko Carstens , David Rientjes , Borislav Petkov , Andy Lutomirski , Paul Walmsley , "Kirill A. Shutemov" , Thomas Gleixner , Vlastimil Babka , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Pekka Enberg , Palmer Dabbelt , "Kirill A . Shutemov" , Joonsoo Kim , "Edgecombe, Rick P" , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , Mike Rapoport Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org From: Mike Rapoport Hi, During recent discussion about KVM protected memory, David raised a concern about usage of __kernel_map_pages() outside of DEBUG_PAGEALLOC scope [1]. Indeed, for architectures that define CONFIG_ARCH_HAS_SET_DIRECT_MAP it is possible that __kernel_map_pages() would fail, but since this function is void, the failure will go unnoticed. Moreover, there's lack of consistency of __kernel_map_pages() semantics across architectures as some guard this function with #ifdef DEBUG_PAGEALLOC, some refuse to update the direct map if page allocation debugging is disabled at run time and some allow modifying the direct map regardless of DEBUG_PAGEALLOC settings. This set straightens this out by restoring dependency of __kernel_map_pages() on DEBUG_PAGEALLOC and updating the call sites accordingly. Since currently the only user of __kernel_map_pages() outside DEBUG_PAGEALLOC is hibernation, it is updated to make direct map accesses there more explicit. [1] https://lore.kernel.org/lkml/2759b4bf-e1e3-d006-7d86-78a40348269d@redhat.com v6 changes: * revert slab changes to avoid redundant check of static key v5 changes: * use pairs of _map()/_unmap() functions instead of _map(..., int enable) as Vlastimil suggested https://lore.kernel.org/lkml/20201108065758.1815-1-rppt@kernel.org v4 changes: * s/WARN_ON/pr_warn_once/ per David and Kirill * rebase on v5.10-rc2 * add Acked/Reviewed tags https://lore.kernel.org/lkml/20201103162057.22916-1-rppt@kernel.org v3 changes: * update arm64 changes to avoid regression, per Rick's comments * fix bisectability https://lore.kernel.org/lkml/20201101170815.9795-1-rppt@kernel.org v2 changes: * Rephrase patch 2 changelog to better describe the change intentions and implications * Move removal of kernel_map_pages() from patch 1 to patch 2, per David https://lore.kernel.org/lkml/20201029161902.19272-1-rppt@kernel.org v1: https://lore.kernel.org/lkml/20201025101555.3057-1-rppt@kernel.org Mike Rapoport (4): mm: introduce debug_pagealloc_{map,unmap}_pages() helpers PM: hibernate: make direct map manipulations more explicit arch, mm: restore dependency of __kernel_map_pages() on DEBUG_PAGEALLOC arch, mm: make kernel_page_present() always available arch/Kconfig | 3 +++ arch/arm64/Kconfig | 4 +-- arch/arm64/include/asm/cacheflush.h | 1 + arch/arm64/mm/pageattr.c | 6 +++-- arch/powerpc/Kconfig | 5 +--- arch/riscv/Kconfig | 4 +-- arch/riscv/include/asm/pgtable.h | 2 -- arch/riscv/include/asm/set_memory.h | 1 + arch/riscv/mm/pageattr.c | 31 ++++++++++++++++++++++ arch/s390/Kconfig | 4 +-- arch/sparc/Kconfig | 4 +-- arch/x86/Kconfig | 4 +-- arch/x86/include/asm/set_memory.h | 1 + arch/x86/mm/pat/set_memory.c | 4 +-- include/linux/mm.h | 40 ++++++++++++++--------------- include/linux/set_memory.h | 5 ++++ kernel/power/snapshot.c | 38 +++++++++++++++++++++++++-- mm/memory_hotplug.c | 3 +-- mm/page_alloc.c | 6 ++--- 19 files changed, 113 insertions(+), 53 deletions(-)