On 7/23/22 06:32, Jason Gunthorpe wrote:
On Fri, Jul 22, 2022 at 03:56:32PM -0700, Ralph Campbell wrote:If hmm_range_fault() is called with the HMM_PFN_REQ_FAULT flag and a device private PTE is found, the hmm_range::dev_private_owner page is used to determine if the device private page should not be faulted in. However, if the device private page is not owned by the caller, hmm_range_fault() returns an error instead of calling migrate_to_ram() to fault in the page. Cc: stable@xxxxxxxxxxxxxxx Fixes: 76612d6ce4cc ("mm/hmm: reorganize how !pte_present is handled in hmm_vma_handle_pte()") Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx> Reported-by: Felix Kuehling <felix.kuehling@xxxxxxx> --- mm/hmm.c | 3 +++ 1 file changed, 3 insertions(+)Should we have a test for this ? Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Jason
Sure, I'll add something to tools/testing/selftests/vm/hmm-tests.c
