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From: Zhang Yi <yi.z.zhang@linux.intel.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvdimm@lists.01.org, pbonzini@redhat.com,
	dan.j.williams@intel.com, dave.jiang@intel.com,
	yu.c.zhang@intel.com, pagupta@redhat.com, david@redhat.com,
	jack@suse.cz, hch@lst.de
Cc: linux-mm@kvack.org, rkrcmar@redhat.com, jglisse@redhat.com,
	yi.z.zhang@intel.com, Zhang Yi <yi.z.zhang@linux.intel.com>
Subject: [PATCH V5 3/4] mm: add a function to differentiate the pages is from DAX device memory
Date: Sat,  8 Sep 2018 02:03:55 +0800
Message-ID: <044309496afbb4121447dff6a453bd6b96d6068d.1536342881.git.yi.z.zhang@linux.intel.com> (raw)
In-Reply-To: <cover.1536342881.git.yi.z.zhang@linux.intel.com>

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 <yi.z.zhang@linux.intel.com>
Signed-off-by: Zhang Yu <yu.c.zhang@linux.intel.com>
Acked-by: Jan Kara <jack@suse.cz>
---
 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)
-- 
2.7.4


  parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-07 18:03 [PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Zhang Yi
2018-09-07 17:04 ` Ahmed S. Darwish
2018-09-18 14:31   ` Yi Zhang
2018-09-07 18:03 ` [PATCH V5 1/4] kvm: remove redundant reserved page check Zhang Yi
2018-10-24 14:32   ` Yi Zhang
2018-09-07 18:03 ` [PATCH V5 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Zhang Yi
2018-09-07 18:03 ` Zhang Yi [this message]
2018-09-07 18:04 ` [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem Zhang Yi
2018-09-19  2:53   ` Dan Williams
2018-09-19  7:20     ` David Hildenbrand
2018-09-20 22:49       ` Yi Zhang
2018-09-20 21:19         ` Dan Williams
2018-09-21 22:47           ` Yi Zhang
2018-09-21 14:23             ` David Hildenbrand
2018-09-21 18:17               ` Dan Williams
2018-09-21 19:29                 ` David Hildenbrand
2018-10-19 16:33                   ` Barret Rhoden
2018-10-22  8:47                     ` Yi Zhang
2018-09-19 10:55 ` [PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Yi Zhang
2018-09-19  2:43   ` Pankaj Gupta

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