diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-03-16 20:32:13 +0100 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-03-26 14:33:37 -0300 |
| commit | f894ddd5ff01d3bb48faf4dc533536bf5269c17a (patch) | |
| tree | 6e62359994be7d1e61aab32864b6cc399cbb09e5 /include/linux/memremap.h | |
| parent | 5a0c38d307afde167175602aa52ca4e6c5c42c44 (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.h | 4 |
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) |