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=-9.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS, UNWANTED_LANGUAGE_BODY,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 3FFCDC43387 for ; Mon, 17 Dec 2018 18:22:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1686920675 for ; Mon, 17 Dec 2018 18:22:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388780AbeLQSWs (ORCPT ); Mon, 17 Dec 2018 13:22:48 -0500 Received: from terminus.zytor.com ([198.137.202.136]:51859 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726887AbeLQSWs (ORCPT ); Mon, 17 Dec 2018 13:22:48 -0500 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id wBHIMOD82561342 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 17 Dec 2018 10:22:24 -0800 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id wBHIMOdt2561339; Mon, 17 Dec 2018 10:22:24 -0800 Date: Mon, 17 Dec 2018 10:22:24 -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: dave.hansen@linux.intel.com, hpa@zytor.com, luto@kernel.org, peterz@infradead.org, riel@surriel.com, mingo@kernel.org, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, tglx@linutronix.de, bp@alien8.de Reply-To: linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de, bp@alien8.de, torvalds@linux-foundation.org, hpa@zytor.com, luto@kernel.org, dave.hansen@linux.intel.com, peterz@infradead.org, riel@surriel.com In-Reply-To: <20181203171043.295174892@infradead.org> References: <20181203171043.295174892@infradead.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/mm] x86/mm/cpa: Make cpa_data::vaddr invariant Git-Commit-ID: 98bfc9b038cde1ce108f69a50720e394fe774cb7 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: 98bfc9b038cde1ce108f69a50720e394fe774cb7 Gitweb: https://git.kernel.org/tip/98bfc9b038cde1ce108f69a50720e394fe774cb7 Author: Peter Zijlstra AuthorDate: Mon, 3 Dec 2018 18:03:47 +0100 Committer: Ingo Molnar CommitDate: Mon, 17 Dec 2018 18:54:24 +0100 x86/mm/cpa: Make cpa_data::vaddr invariant Currently __change_page_attr_set_clr() will modify cpa->vaddr when !(CPA_ARRAY | CPA_PAGES_ARRAY), whereas in the array cases it will increment cpa->curpage. Change __cpa_addr() such that its @idx argument also works in the !array case and use cpa->curpage increments for all cases. NOTE: since cpa_data::numpages is 'unsigned long' so should cpa_data::curpage be. NOTE: after this only cpa->numpages is still modified. 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/20181203171043.295174892@infradead.org Signed-off-by: Ingo Molnar --- arch/x86/mm/pageattr.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 6e6900ebea30..ce8af3f08628 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -35,11 +35,11 @@ struct cpa_data { pgprot_t mask_set; pgprot_t mask_clr; unsigned long numpages; - int flags; + unsigned long curpage; unsigned long pfn; - unsigned force_split : 1, + unsigned int flags; + unsigned int force_split : 1, force_static_prot : 1; - int curpage; struct page **pages; }; @@ -228,7 +228,7 @@ static bool __cpa_pfn_in_highmap(unsigned long pfn) #endif -static unsigned long __cpa_addr(struct cpa_data *cpa, int idx) +static unsigned long __cpa_addr(struct cpa_data *cpa, unsigned long idx) { if (cpa->flags & CPA_PAGES_ARRAY) { struct page *page = cpa->pages[idx]; @@ -242,7 +242,7 @@ static unsigned long __cpa_addr(struct cpa_data *cpa, int idx) if (cpa->flags & CPA_ARRAY) return cpa->vaddr[idx]; - return *cpa->vaddr; + return *cpa->vaddr + idx * PAGE_SIZE; } /* @@ -1581,6 +1581,7 @@ static int cpa_process_alias(struct cpa_data *cpa) alias_cpa = *cpa; alias_cpa.vaddr = &laddr; alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); + alias_cpa.curpage = 0; ret = __change_page_attr_set_clr(&alias_cpa, 0); if (ret) @@ -1600,6 +1601,7 @@ static int cpa_process_alias(struct cpa_data *cpa) alias_cpa = *cpa; alias_cpa.vaddr = &temp_cpa_vaddr; alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); + alias_cpa.curpage = 0; /* * The high mapping range is imprecise, so ignore the @@ -1648,11 +1650,7 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias) */ BUG_ON(cpa->numpages > numpages || !cpa->numpages); numpages -= cpa->numpages; - if (cpa->flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) - cpa->curpage++; - else - *cpa->vaddr += cpa->numpages * PAGE_SIZE; - + cpa->curpage += cpa->numpages; } return 0; }