From: Jérôme Glisse <[email protected]> When faulting or updating the device page table properly handle the case of device memory entry.
Signed-off-by: Jérôme Glisse <[email protected]> --- mm/hmm.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/mm/hmm.c b/mm/hmm.c index 761905a..e4585b7 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -613,6 +613,13 @@ static void hmm_mirror_update_pte(struct hmm_mirror *mirror, goto out; } + if (hmm_pte_test_valid_dev(hmm_pte)) { + *hmm_pte &= event->pte_mask; + if (!hmm_pte_test_valid_dev(hmm_pte)) + hmm_pt_iter_directory_unref(iter, mirror->pt.llevel); + return; + } + if (!hmm_pte_test_valid_dma(hmm_pte)) return; @@ -813,6 +820,13 @@ static int hmm_mirror_fault_pmd(pmd_t *pmdp, do { next = hmm_pt_level_next(&mirror->pt, addr, hmm_end, mirror->pt.llevel); + + if (hmm_pte_test_valid_dev(&hmm_pte[i])) { + if (write) + hmm_pte_set_write(&hmm_pte[i]); + continue; + } + if (!pte_present(*ptep) || (write && !pte_write(*ptep))) { ret = -ENOENT; ptep++; -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
