[PATCH 4/4] iommu/vt-d: Calculate and set flags for handle_mm_fault

[Jacob Pan]

Page requests are originated from the user page fault. Therefore, we
shall set FAULT_FLAG_USER. 

FAULT_FLAG_REMOTE indicates that we are walking an mm which is not
guaranteed to be the same as the current->mm and should not be subject
to protection key enforcement. Therefore, we should set FAULT_FLAG_REMOTE
to avoid faults when both SVM and PKEY are used.

References: commit 1b2ee1266ea6 ("mm/core: Do not enforce PKEY permissions on remote mm access")
Reviewed-by: Raj Ashok <ashok.raj@xxxxxxxxx>
Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
---
 drivers/iommu/intel/svm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ff7ae7cc17d5..7bfd20a24a60 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -1086,6 +1086,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 	struct intel_iommu *iommu = d;
 	struct intel_svm *svm = NULL;
 	int head, tail, handled = 0;
+	unsigned int flags = 0;
 
 	/* Clear PPR bit before reading head/tail registers, to
 	 * ensure that we get a new interrupt if needed. */
@@ -1186,9 +1187,11 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 		if (access_error(vma, req))
 			goto invalid;
 
-		ret = handle_mm_fault(vma, address,
-				      req->wr_req ? FAULT_FLAG_WRITE : 0,
-				      NULL);
+		flags = FAULT_FLAG_USER | FAULT_FLAG_REMOTE;
+		if (req->wr_req)
+			flags |= FAULT_FLAG_WRITE;
+
+		ret = handle_mm_fault(vma, address, flags, NULL);
 		if (ret & VM_FAULT_ERROR)
 			goto invalid;
 
-- 
2.25.1