From: Philip Yang <philip.y...@amd.com> While the page is migrating by NUMA balancing, HMM failed to detect this condition and still return the old page. Application will use the new page migrated, but driver pass the old page physical address to GPU, this crash the application later.
Use pte_protnone(pte) to return this condition and then hmm_vma_do_fault will allocate new page. Link: http://lkml.kernel.org/r/20190510195258.9930-2-felix.kuehl...@amd.com Signed-off-by: Philip Yang <philip.y...@amd.com> Signed-off-by: Felix Kuehling <felix.kuehl...@amd.com> Reviewed-by: Jérôme Glisse <jgli...@redhat.com> Cc: Alex Deucher <alex.deuc...@amd.com> Cc: Dave Airlie <airl...@gmail.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> --- mm/hmm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/hmm.c b/mm/hmm.c index 0db8491090b8..599d8e82db67 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -559,7 +559,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk, static inline uint64_t pte_to_hmm_pfn_flags(struct hmm_range *range, pte_t pte) { - if (pte_none(pte) || !pte_present(pte)) + if (pte_none(pte) || !pte_present(pte) || pte_protnone(pte)) return 0; return pte_write(pte) ? range->flags[HMM_PFN_VALID] | range->flags[HMM_PFN_WRITE] : -- 2.17.1 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
