From patchwork Thu Aug 9 10:53:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhang, Yi" X-Patchwork-Id: 10560727 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DBC7314E5 for ; Thu, 9 Aug 2018 02:14:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C50602AC87 for ; Thu, 9 Aug 2018 02:14:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B8D9F2AD81; Thu, 9 Aug 2018 02:14:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=2.0 tests=BAYES_00,DATE_IN_FUTURE_06_12, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E6062AC87 for ; Thu, 9 Aug 2018 02:14:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727674AbeHIEhD (ORCPT ); Thu, 9 Aug 2018 00:37:03 -0400 Received: from mga09.intel.com ([134.134.136.24]:59918 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725757AbeHIEhC (ORCPT ); Thu, 9 Aug 2018 00:37:02 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Aug 2018 19:14:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,213,1531810800"; d="scan'208";a="74999559" Received: from linux.intel.com ([10.54.29.200]) by fmsmga002.fm.intel.com with ESMTP; 08 Aug 2018 19:14:38 -0700 Received: from dazhang1-ssd.sh.intel.com (unknown [10.239.48.78]) by linux.intel.com (Postfix) with ESMTP id E129B5801BD; Wed, 8 Aug 2018 19:14:35 -0700 (PDT) From: Zhang Yi To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, pbonzini@redhat.com, dan.j.williams@intel.com, jack@suse.cz, hch@lst.de, yu.c.zhang@intel.com Cc: linux-mm@kvack.org, rkrcmar@redhat.com, yi.z.zhang@intel.com, Zhang Yi Subject: [PATCH V3 3/4] mm: add a function to differentiate the pages is from DAX device memory Date: Thu, 9 Aug 2018 18:53:21 +0800 Message-Id: <2b7856596e519130946c834d5d61b00b7f592770.1533811181.git.yi.z.zhang@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP DAX driver hotplug the device memory and move it to memory zone, these pages will be marked reserved flag, however, some other kernel componet will misconceive these pages are reserved mmio (ex: we map these dev_dax or fs_dax pages to kvm for DIMM/NVDIMM backend). Together with the type MEMORY_DEVICE_FS_DAX, we can use is_dax_page() to differentiate the pages is DAX device memory or not. Signed-off-by: Zhang Yi Signed-off-by: Zhang Yu --- include/linux/mm.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 68a5121..de5cbc3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -889,6 +889,13 @@ static inline bool is_device_public_page(const struct page *page) page->pgmap->type == MEMORY_DEVICE_PUBLIC; } +static inline bool is_dax_page(const struct page *page) +{ + return is_zone_device_page(page) && + (page->pgmap->type == MEMORY_DEVICE_FS_DAX || + page->pgmap->type == MEMORY_DEVICE_DEV_DAX); +} + #else /* CONFIG_DEV_PAGEMAP_OPS */ static inline void dev_pagemap_get_ops(void) { @@ -912,6 +919,11 @@ static inline bool is_device_public_page(const struct page *page) { return false; } + +static inline bool is_dax_page(const struct page *page) +{ + return false; +} #endif /* CONFIG_DEV_PAGEMAP_OPS */ static inline void get_page(struct page *page)