diff options
| author | Ralph Campbell <rcampbell@nvidia.com> | 2019-10-23 12:55:14 -0700 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-10-29 14:26:28 -0300 |
| commit | ac541f2503722943a9f13e0c92ed07632ba7fd38 (patch) | |
| tree | 66c9f31f41501650ebfc34378d0bed0addb111cd /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | d6d5df1db6e9d7f8f76d2911707f7d5877251b02 (diff) | |
mm/hmm: allow snapshot of the special zero page
If a device driver like nouveau tries to use hmm_range_fault() to access
the special shared zero page in system memory, hmm_range_fault() will
return -EFAULT and kill the process.
Allow hmm_range_fault() to return success (0) when the CPU pagetable entry
points to the special shared zero page.
page_to_pfn() and pfn_to_page() are defined on the zero page so just
handle it like any other page.
Link: https://lore.kernel.org/r/20191023195515.13168-3-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: "Jérôme Glisse" <jglisse@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions