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[PATCH v11 05/14] HMM: handle HMM device page table entry on mirror page table fault and update.

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When faulting or updating the device page table properly handle the case of
device memory entry.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
---
 mm/hmm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mm/hmm.c b/mm/hmm.c
index 1c81c68..6224131 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -607,6 +607,13 @@ 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);
+		return;
+	}
+
 	if (!hmm_pte_test_valid_dma(hmm_pte))
 		return;
 
@@ -804,6 +811,12 @@ static int hmm_mirror_fault_pmd(pmd_t *pmdp,
 		ptep = pte_offset_map(pmdp, start);
 		hmm_pt_iter_directory_lock(iter);
 		do {
+			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)) ||
 			    pte_protnone(*ptep)) {
-- 
2.4.3

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Thread

[PATCH v11 00/14] HMM anomymous memory migration to device memory Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 07/14] HMM: mm add helper to update page table when migrating memory v2. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 06/14] HMM: mm add helper to update page table when migrating memory back v2. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 05/14] HMM: handle HMM device page table entry on mirror page table fault and update. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 11/14] HMM: add helpers for migration back to system memory v3. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 02/14] HMM: add special swap filetype for memory migrated to device v2. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 14/14] HMM: add mirror fault support for system to device memory migration v3. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 09/14] HMM: allow to get pointer to spinlock protecting a directory. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 04/14] HMM: add new HMM page table flag (select flag). Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 13/14] HMM: CPU page fault on migrated memory. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 10/14] HMM: split DMA mapping function in two. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 12/14] HMM: fork copy migrated memory into system memory for child process. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:20 +0200
  [PATCH v11 08/14] HMM: new callback for copying memory from and to device memory v2. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:30 +0200
  [PATCH v11 01/14] fork: pass the dst vma to copy_page_range() and its sub-functions. Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:30 +0200
  [PATCH v11 03/14] HMM: add new HMM page table flag (valid device memory). Jérôme Glisse <jglisse@redhat.com> - 2015-10-21 22:30 +0200

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