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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6F58C433E0 for ; Thu, 21 May 2020 23:03:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89BA020814 for ; Thu, 21 May 2020 23:03:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730770AbgEUXDz (ORCPT ); Thu, 21 May 2020 19:03:55 -0400 Received: from mga07.intel.com ([134.134.136.100]:45111 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730675AbgEUXDy (ORCPT ); Thu, 21 May 2020 19:03:54 -0400 IronPort-SDR: cza8/45+rUTZ9oiNlwpHYZWX7FHBJ5+rVpGlZyA2uoErR5jWm2RNmJ1jtkHEoc2onF4CMOmFlk okuj+y4PE98g== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2020 16:03:53 -0700 IronPort-SDR: DgQs7SXd1szE8NYyxhw5lecmu2lqp8tyfYL/jmYBJ3sXju5AphXshjek1tw+1OScKjKlSKjuv1 UTnwC46WcgEA== X-IronPort-AV: E=Sophos;i="5.73,419,1583222400"; d="scan'208";a="255441198" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2020 16:03:53 -0700 Subject: [PATCH v4 0/2] Renovate memcpy_mcsafe with copy_mc_to_{user, kernel} From: Dan Williams To: tglx@linutronix.de, mingo@redhat.com Cc: Tony Luck , Vivek Goyal , Peter Zijlstra , Linus Torvalds , Alexander Viro , Borislav Petkov , stable@vger.kernel.org, x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Paul Mackerras , Benjamin Herrenschmidt , Erwin Tsaur , Michael Ellerman , Mikulas Patocka , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org Date: Thu, 21 May 2020 15:47:41 -0700 Message-ID: <159010126119.975921.6614194205409771984.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Changes since v3 [1]: - Drop extern for new function declarations (Michael) - Rename memcpy_mcsafe_64.S to copy_mc_64.S instead of copy_mc.S and related fixups (Michael) - Add a new symlink (tools/testing/selftests/powerpc/copyloops/copy_mc_64.S) to the new copy_mc_64.S to fix selftest build breakage (Michael) - Drop one instance of copy_safe() that survived from v2 of the patchset (Vivek) - Fix 32-bit x86 build breakage (kbuild robot) - Kill off rather than rename tools/arch/x86/include/asm/mcsafe_test.h since perf is no longer burden with dealing with the copy_mc_generic() implementation. - Build success notification received for revised set (kbuild robot) [1]: http://lore.kernel.org/r/158992635164.403910.2616621400995359522.stgit@dwillia2-desk3.amr.corp.intel.com --- The primary motivation to go touch memcpy_mcsafe() is that the existing benefit of doing slow "handle with care" copies is obviated on newer CPUs. With that concern lifted it also obviates the need to continue to update the MCA-recovery capability detection code currently gated by "mcsafe_key". Now the old "mcsafe_key" opt-in to perform the copy with concerns for recovery fragility can instead be made an opt-out from the default fast copy implementation (enable_copy_mc_fragile()). The discussion with Linus on the first iteration of this patch identified that memcpy_mcsafe() was misnamed relative to its usage. The new names copy_mc_to_user() and copy_mc_to_kernel() clearly indicate the intended use case and lets the architecture organize the implementation accordingly. For both powerpc and x86 a copy_mc_generic() implementation is added as the backend for these interfaces. Patches are relative to tip/master. --- Dan Williams (2): x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user,kernel}() x86/copy_mc: Introduce copy_mc_generic() arch/powerpc/Kconfig | 2 arch/powerpc/include/asm/string.h | 2 arch/powerpc/include/asm/uaccess.h | 40 +++-- arch/powerpc/lib/Makefile | 2 arch/powerpc/lib/copy_mc_64.S | 4 arch/x86/Kconfig | 2 arch/x86/Kconfig.debug | 2 arch/x86/include/asm/copy_mc_test.h | 75 +++++++++ arch/x86/include/asm/mcsafe_test.h | 75 --------- arch/x86/include/asm/string_64.h | 32 ---- arch/x86/include/asm/uaccess.h | 21 +++ arch/x86/include/asm/uaccess_64.h | 20 -- arch/x86/kernel/cpu/mce/core.c | 8 - arch/x86/kernel/quirks.c | 9 - arch/x86/lib/Makefile | 1 arch/x86/lib/copy_mc.c | 64 ++++++++ arch/x86/lib/copy_mc_64.S | 165 ++++++++++++++++++++ arch/x86/lib/memcpy_64.S | 115 -------------- arch/x86/lib/usercopy_64.c | 21 --- drivers/md/dm-writecache.c | 15 +- drivers/nvdimm/claim.c | 2 drivers/nvdimm/pmem.c | 6 - include/linux/string.h | 9 - include/linux/uaccess.h | 9 + include/linux/uio.h | 10 + lib/Kconfig | 7 + lib/iov_iter.c | 43 +++-- tools/arch/x86/include/asm/mcsafe_test.h | 13 -- tools/arch/x86/lib/memcpy_64.S | 115 -------------- tools/objtool/check.c | 5 - tools/perf/bench/Build | 1 tools/perf/bench/mem-memcpy-x86-64-lib.c | 24 --- tools/testing/nvdimm/test/nfit.c | 48 +++--- .../testing/selftests/powerpc/copyloops/.gitignore | 2 tools/testing/selftests/powerpc/copyloops/Makefile | 6 - .../selftests/powerpc/copyloops/copy_mc_64.S | 1 .../selftests/powerpc/copyloops/memcpy_mcsafe_64.S | 1 37 files changed, 451 insertions(+), 526 deletions(-) rename arch/powerpc/lib/{memcpy_mcsafe_64.S => copy_mc_64.S} (98%) create mode 100644 arch/x86/include/asm/copy_mc_test.h delete mode 100644 arch/x86/include/asm/mcsafe_test.h create mode 100644 arch/x86/lib/copy_mc.c create mode 100644 arch/x86/lib/copy_mc_64.S delete mode 100644 tools/arch/x86/include/asm/mcsafe_test.h delete mode 100644 tools/perf/bench/mem-memcpy-x86-64-lib.c create mode 120000 tools/testing/selftests/powerpc/copyloops/copy_mc_64.S delete mode 120000 tools/testing/selftests/powerpc/copyloops/memcpy_mcsafe_64.S base-commit: bba413deb1065f1291cb1f366247513f11215520