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mm: handle multiple owners of device private pages in migrate_vma

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Add a new src_owner field to struct migrate_vma.  If the field is set,
only device private pages with page->pgmap->owner equal to that field are
migrated.  If the field is not set only "normal" pages are migrated.

Fixes: df6ad69838 ("mm/device-public-memory: device memory cache coherent with CPU")
Link: https://lore.kernel.org/r/20200316193216.920734-3-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>
This commit is contained in:
Christoph Hellwig
2020-03-16 20:32:14 +01:00
committed by Jason Gunthorpe
parent f894ddd5ff
commit 800bb1c8dc
4 changed files with 16 additions and 3 deletions
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8
include/linux/migrate.h
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@@ -196,6 +196,14 @@ struct migrate_vma {
unsigned long npages;
unsigned long start;
unsigned long end;
/*
* Set to the owner value also stored in page->pgmap->owner for
* migrating out of device private memory. If set only device
* private pages with this owner are migrated. If not set
* device private pages are not migrated at all.
*/
void *src_owner;
};
int migrate_vma_setup(struct migrate_vma *args);