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=-12.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 99287C43387 for ; Mon, 17 Dec 2018 18:23:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6A9D120675 for ; Mon, 17 Dec 2018 18:23:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388799AbeLQSXY (ORCPT ); Mon, 17 Dec 2018 13:23:24 -0500 Received: from terminus.zytor.com ([198.137.202.136]:51101 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726887AbeLQSXX (ORCPT ); Mon, 17 Dec 2018 13:23:23 -0500 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id wBHIN0wY2561412 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 17 Dec 2018 10:23:00 -0800 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id wBHIN0HP2561409; Mon, 17 Dec 2018 10:23:00 -0800 Date: Mon, 17 Dec 2018 10:23:00 -0800 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Peter Zijlstra Message-ID: Cc: riel@surriel.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, luto@kernel.org, dave.hansen@linux.intel.com, hpa@zytor.com, torvalds@linux-foundation.org, bp@alien8.de, mingo@kernel.org, peterz@infradead.org Reply-To: peterz@infradead.org, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, riel@surriel.com, tglx@linutronix.de, dave.hansen@linux.intel.com, mingo@kernel.org, torvalds@linux-foundation.org, bp@alien8.de In-Reply-To: <20181203171043.366619025@infradead.org> References: <20181203171043.366619025@infradead.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/mm] x86/mm/cpa: Simplify the code after making cpa->vaddr invariant Git-Commit-ID: 5fe26b7a8f4693d532c7a3c3632e47e7d7016238 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 5fe26b7a8f4693d532c7a3c3632e47e7d7016238 Gitweb: https://git.kernel.org/tip/5fe26b7a8f4693d532c7a3c3632e47e7d7016238 Author: Peter Zijlstra AuthorDate: Mon, 3 Dec 2018 18:03:48 +0100 Committer: Ingo Molnar CommitDate: Mon, 17 Dec 2018 18:54:25 +0100 x86/mm/cpa: Simplify the code after making cpa->vaddr invariant Since cpa->vaddr is invariant, this means we can remove all workarounds that deal with it changing. Signed-off-by: Peter Zijlstra (Intel) Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Cc: Tom.StDenis@amd.com Cc: dave.hansen@intel.com Link: http://lkml.kernel.org/r/20181203171043.366619025@infradead.org Signed-off-by: Ingo Molnar --- arch/x86/mm/pageattr-test.c | 7 ++----- arch/x86/mm/pageattr.c | 13 ++++--------- 2 files changed, 6 insertions(+), 14 deletions(-) diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c index b6b6468530f1..facce271e8b9 100644 --- a/arch/x86/mm/pageattr-test.c +++ b/arch/x86/mm/pageattr-test.c @@ -124,7 +124,6 @@ static int pageattr_test(void) unsigned int level; int i, k; int err; - unsigned long test_addr; if (print) printk(KERN_INFO "CPA self-test:\n"); @@ -181,8 +180,7 @@ static int pageattr_test(void) switch (i % 3) { case 0: - test_addr = addr[i]; - err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0); + err = change_page_attr_set(&addr[i], len[i], PAGE_CPA_TEST, 0); break; case 1: @@ -226,8 +224,7 @@ static int pageattr_test(void) failed++; continue; } - test_addr = addr[i]; - err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0); + err = change_page_attr_clear(&addr[i], len[i], PAGE_CPA_TEST, 0); if (err < 0) { printk(KERN_ERR "CPA reverting failed: %d\n", err); failed++; diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index ce8af3f08628..afa98b7b6050 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -1908,15 +1908,13 @@ EXPORT_SYMBOL_GPL(set_memory_array_wt); int _set_memory_wc(unsigned long addr, int numpages) { int ret; - unsigned long addr_copy = addr; ret = change_page_attr_set(&addr, numpages, cachemode2pgprot(_PAGE_CACHE_MODE_UC_MINUS), 0); if (!ret) { - ret = change_page_attr_set_clr(&addr_copy, numpages, - cachemode2pgprot( - _PAGE_CACHE_MODE_WC), + ret = change_page_attr_set_clr(&addr, numpages, + cachemode2pgprot(_PAGE_CACHE_MODE_WC), __pgprot(_PAGE_CACHE_MASK), 0, 0, NULL); } @@ -2064,7 +2062,6 @@ int set_memory_global(unsigned long addr, int numpages) static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) { struct cpa_data cpa; - unsigned long start; int ret; /* Nothing to do if memory encryption is not active */ @@ -2075,8 +2072,6 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) if (WARN_ONCE(addr & ~PAGE_MASK, "misaligned address: %#lx\n", addr)) addr &= PAGE_MASK; - start = addr; - memset(&cpa, 0, sizeof(cpa)); cpa.vaddr = &addr; cpa.numpages = numpages; @@ -2091,7 +2086,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) /* * Before changing the encryption attribute, we need to flush caches. */ - cpa_flush_range(start, numpages, 1); + cpa_flush_range(addr, numpages, 1); ret = __change_page_attr_set_clr(&cpa, 1); @@ -2102,7 +2097,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) * in case TLB flushing gets optimized in the cpa_flush_range() * path use the same logic as above. */ - cpa_flush_range(start, numpages, 0); + cpa_flush_range(addr, numpages, 0); return ret; }