From patchwork Thu Oct 29 16:18:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 11866755 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 C993B6A2 for ; Thu, 29 Oct 2020 16:19:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 615FB20790 for ; Thu, 29 Oct 2020 16:19:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="niaN+8JA" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 615FB20790 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 593A96B0070; Thu, 29 Oct 2020 12:19:31 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 544226B0071; Thu, 29 Oct 2020 12:19:31 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 433006B0072; Thu, 29 Oct 2020 12:19:31 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0073.hostedemail.com [216.40.44.73]) by kanga.kvack.org (Postfix) with ESMTP id 103226B0070 for ; Thu, 29 Oct 2020 12:19:31 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id ACC5E1EFD for ; Thu, 29 Oct 2020 16:19:30 +0000 (UTC) X-FDA: 77425473300.23.anger30_1e079972728e Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id 8450737609 for ; Thu, 29 Oct 2020 16:19:30 +0000 (UTC) X-Spam-Summary: 1,0,0,1e491a8ea49ea844,d41d8cd98f00b204,rppt@kernel.org,,RULES_HIT:41:69:355:379:541:800:960:967:973:988:989:1260:1311:1314:1345:1437:1515:1535:1542:1711:1730:1747:1777:1792:1801:2393:2525:2559:2564:2682:2685:2693:2859:2895:2899:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3353:3865:3866:3867:3868:3871:3872:3874:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4184:4250:4321:4605:5007:6119:6261:6653:6742:6743:7576:7903:8660:9025:9389:10004:11026:11473:11657:11658:11914:12043:12291:12296:12297:12438:12517:12519:12555:12679:12895:12986:13148:13230:13845:13846:13894:14096:14180:14181:14394:14721:14819:21060:21080:21325:21451:21627:21795:21811:21939:21966:30051:30054:30069:30070,0,RBL:198.145.29.99:@kernel.org:.lbl8.mailshell.net-64.100.201.201 62.2.0.100;04ygasr9ks3k8jhgwj6fheu8k1n3kyc37kj7p8y4rjz5u415max6ydzpj9uaxwc.s6w53hmn6qyf9f9yojn56kjzpnwynrab6rf5ao38tpi4jmogn36z3q5nc67niaq.w-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian :0.5,0.5 X-HE-Tag: anger30_1e079972728e X-Filterd-Recvd-Size: 5400 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Thu, 29 Oct 2020 16:19:29 +0000 (UTC) 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 CABCB206FB; Thu, 29 Oct 2020 16:19:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603988368; bh=2JTyiuhHlVkYEp7vxXi6FfQYN8dW7lOInW1H++QF+hs=; h=From:To:Cc:Subject:Date:From; b=niaN+8JAS/4W9JHksJm0Q47SN+sHL1+VOaj2NJjOvyy7ijmitrj/o/I742YBGzdgm RYf21PgV+5zFn96YUbLlJ0Sm8wW5GsFIcfLtN818zpU8fifkY4xz/A49MdemMhRkE2 Y7tJjHsmXKkJ4YxbW7vNBYXxmEywtkArNYd8+PAQ= From: Mike Rapoport To: Andrew Morton Cc: Albert Ou , Andy Lutomirski , Benjamin Herrenschmidt , Borislav Petkov , Catalin Marinas , Christian Borntraeger , Christoph Lameter , "David S. Miller" , Dave Hansen , David Hildenbrand , David Rientjes , "Edgecombe, Rick P" , "H. Peter Anvin" , Heiko Carstens , Ingo Molnar , Joonsoo Kim , "Kirill A. Shutemov" , Len Brown , Michael Ellerman , Mike Rapoport , Mike Rapoport , Palmer Dabbelt , Paul Mackerras , Paul Walmsley , Pavel Machek , Pekka Enberg , Peter Zijlstra , "Rafael J. Wysocki" , Thomas Gleixner , Vasily Gorbik , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v2 0/4] arch, mm: improve robustness of direct map manipulation Date: Thu, 29 Oct 2020 18:18:58 +0200 Message-Id: <20201029161902.19272-1-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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, it is updated to make direct map accesses there more explicit. [1] https://lore.kernel.org/lkml/2759b4bf-e1e3-d006-7d86-78a40348269d@redhat.com 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 v1: https://lore.kernel.org/lkml/20201025101555.3057-1-rppt@kernel.org Mike Rapoport (4): mm: introduce debug_pagealloc_map_pages() helper PM: hibernate: make direct map manipulations more explicit arch, mm: restore dependency of __kernel_map_pages() of 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 | 35 +++++++++++++---------------- include/linux/set_memory.h | 5 +++++ kernel/power/snapshot.c | 30 +++++++++++++++++++++++-- mm/memory_hotplug.c | 3 +-- mm/page_alloc.c | 6 ++--- mm/slab.c | 8 +++---- 20 files changed, 103 insertions(+), 58 deletions(-)