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=-2.8 required=3.0 tests=DATE_IN_FUTURE_06_12, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT 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 0B3A4C5CFE7 for ; Tue, 10 Jul 2018 08:23:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AFADB20871 for ; Tue, 10 Jul 2018 08:23:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AFADB20871 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933313AbeGJIXl (ORCPT ); Tue, 10 Jul 2018 04:23:41 -0400 Received: from mga09.intel.com ([134.134.136.24]:43240 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751332AbeGJIXj (ORCPT ); Tue, 10 Jul 2018 04:23:39 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Jul 2018 01:23:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,333,1526367600"; d="scan'208";a="70108231" Received: from linux.intel.com ([10.54.29.200]) by fmsmga004.fm.intel.com with ESMTP; 10 Jul 2018 01:23:38 -0700 Received: from dazhang1-ssd.sh.intel.com (unknown [10.239.48.78]) by linux.intel.com (Postfix) with ESMTP id 43338580388; Tue, 10 Jul 2018 01:23:36 -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 V2 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Date: Wed, 11 Jul 2018 01:01:59 +0800 Message-Id: <7e20d862f96662e1a7736dbb747a71949933dcd4.1531241281.git.yi.z.zhang@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, NVDIMM pages will be marked 'PageReserved'. However, unlike other reserved PFNs, pages on NVDIMM shall still behave like normal ones in many cases, i.e. when used as backend memory of KVM guest. This patch introduces a new memory type, MEMORY_DEVICE_DEV_DAX. And set this flag while dax driver hotplug the device memory. Signed-off-by: Zhang Yi Signed-off-by: Zhang Yu --- drivers/dax/pmem.c | 1 + include/linux/memremap.h | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c index fd49b24..fb3f363 100644 --- a/drivers/dax/pmem.c +++ b/drivers/dax/pmem.c @@ -111,6 +111,7 @@ static int dax_pmem_probe(struct device *dev) return rc; dax_pmem->pgmap.ref = &dax_pmem->ref; + dax_pmem->pgmap.type = MEMORY_DEVICE_DEV_DAX; addr = devm_memremap_pages(dev, &dax_pmem->pgmap); if (IS_ERR(addr)) return PTR_ERR(addr); diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 5ebfff6..a36bce8 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -53,11 +53,20 @@ struct vmem_altmap { * wakeup event whenever a page is unpinned and becomes idle. This * wakeup is used to coordinate physical address space management (ex: * fs truncate/hole punch) vs pinned pages (ex: device dma). + * + * MEMORY_DEVICE_DEV_DAX: + * 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 differentiate the pages on NVDIMM with the + * normal reserved pages. */ enum memory_type { MEMORY_DEVICE_PRIVATE = 1, MEMORY_DEVICE_PUBLIC, MEMORY_DEVICE_FS_DAX, + MEMORY_DEVICE_DEV_DAX, }; /* -- 2.7.4