From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754157AbbFDQ44 (ORCPT ); Thu, 4 Jun 2015 12:56:56 -0400 Received: from mail.skyhub.de ([78.46.96.112]:51700 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754128AbbFDQzo (ORCPT ); Thu, 4 Jun 2015 12:55:44 -0400 From: Borislav Petkov To: Ingo Molnar Cc: LKML Subject: [PATCH 05/20] x86/mm/pat: Change reserve_memtype() for Write-Through type Date: Thu, 4 Jun 2015 18:55:13 +0200 Message-Id: <1433436928-31903-6-git-send-email-bp@alien8.de> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1433436928-31903-1-git-send-email-bp@alien8.de> References: <1433436928-31903-1-git-send-email-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Toshi Kani When a target range is in RAM, reserve_ram_pages_type() verifies the requested type. Change it to fail WT and WP requests with -EINVAL since set_page_memtype() is limited to handle three types: WB, WC and UC-. Signed-off-by: Toshi Kani Cc: Andrew Morton Cc: Andy Lutomirski Cc: arnd@arndb.de Cc: Elliott@hp.com Cc: hch@lst.de Cc: hmh@hmh.eng.br Cc: H. Peter Anvin Cc: Ingo Molnar Cc: jgross@suse.com Cc: konrad.wilk@oracle.com Cc: linux-mm Cc: linux-nvdimm@lists.01.org Cc: Luis R. Rodriguez Cc: stefan.bader@canonical.com Cc: x86-ml Cc: yigal@plexistor.com Link: http://lkml.kernel.org/r/1433187393-22688-3-git-send-email-toshi.kani@hp.com Signed-off-by: Borislav Petkov --- arch/x86/mm/pat.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 59ab1a0fe21b..6311193fd1a2 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -401,9 +401,12 @@ static int pat_pagerange_is_ram(resource_size_t start, resource_size_t end) /* * For RAM pages, we use page flags to mark the pages with appropriate type. - * Here we do two pass: - * - Find the memtype of all the pages in the range, look for any conflicts - * - In case of no conflicts, set the new memtype for pages in the range + * The page flags are limited to three types, WB, WC and UC-. WT and WP requests + * fail with -EINVAL, and UC gets redirected to UC-. + * + * Here we do two passes: + * - Find the memtype of all the pages in the range, look for any conflicts. + * - In case of no conflicts, set the new memtype for pages in the range. */ static int reserve_ram_pages_type(u64 start, u64 end, enum page_cache_mode req_type, @@ -412,6 +415,13 @@ static int reserve_ram_pages_type(u64 start, u64 end, struct page *page; u64 pfn; + if ((req_type == _PAGE_CACHE_MODE_WT) || + (req_type == _PAGE_CACHE_MODE_WP)) { + if (new_type) + *new_type = _PAGE_CACHE_MODE_UC_MINUS; + return -EINVAL; + } + if (req_type == _PAGE_CACHE_MODE_UC) { /* We do not support strong UC */ WARN_ON_ONCE(1); @@ -461,6 +471,7 @@ static int free_ram_pages_type(u64 start, u64 end) * - _PAGE_CACHE_MODE_WC * - _PAGE_CACHE_MODE_UC_MINUS * - _PAGE_CACHE_MODE_UC + * - _PAGE_CACHE_MODE_WT * * If new_type is NULL, function will return an error if it cannot reserve the * region with req_type. If new_type is non-NULL, function will return -- 2.3.5