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authorChristoph Hellwig <hch@lst.de>2020-03-16 20:32:13 +0100
committerJason Gunthorpe <jgg@mellanox.com>2020-03-26 14:33:37 -0300
commitf894ddd5ff01d3bb48faf4dc533536bf5269c17a (patch)
tree6e62359994be7d1e61aab32864b6cc399cbb09e5 /include/linux/memremap.h
parent5a0c38d307afde167175602aa52ca4e6c5c42c44 (diff)
memremap: add an owner field to struct dev_pagemap
Add a new opaque owner field to struct dev_pagemap, which will allow the hmm and migrate_vma code to identify who owns ZONE_DEVICE memory, and refuse to work on mappings not owned by the calling entity. Link: https://lore.kernel.org/r/20200316193216.920734-2-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ralph Campbell <rcampbell@nvidia.com> Tested-by: Bharata B Rao <bharata@linux.ibm.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/linux/memremap.h')
-rw-r--r--include/linux/memremap.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 6fefb09af7c3..60d97e8fd3c0 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -103,6 +103,9 @@ struct dev_pagemap_ops {
* @type: memory type: see MEMORY_* in memory_hotplug.h
* @flags: PGMAP_* flags to specify defailed behavior
* @ops: method table
+ * @owner: an opaque pointer identifying the entity that manages this
+ * instance. Used by various helpers to make sure that no
+ * foreign ZONE_DEVICE memory is accessed.
*/
struct dev_pagemap {
struct vmem_altmap altmap;
@@ -113,6 +116,7 @@ struct dev_pagemap {
enum memory_type type;
unsigned int flags;
const struct dev_pagemap_ops *ops;
+ void *owner;
};
static inline struct vmem_altmap *pgmap_altmap(struct dev_pagemap *pgmap)