When supervisor/privilige mode SVM is used, we bind init_mm.pgd with
a supervisor PASID. There should not be any page fault for init_mm.
Execution request with DMA read is also not supported.
This patch checks PRQ descriptor for both unsupported configurations,
reject them both with invalid responses.
Fixes: 1c4f88b7f1f92 ("iommu/vt-d: Shared virtual address in scalable
mode")
Acked-by: Lu Baolu <baolu...@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
---
drivers/iommu/intel/svm.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 23a1e4f58c54..ff7ae7cc17d5 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -1113,7 +1113,17 @@ static irqreturn_t prq_event_thread(int irq, void *d)
((unsigned long long *)req)[1]);
goto no_pasid;
}
-
+ /* We shall not receive page request for supervisor SVM */
+ if (req->pm_req && (req->rd_req | req->wr_req)) {
+ pr_err("Unexpected page request in Privilege Mode");
+ /* No need to find the matching sdev as for bad_req */
+ goto no_pasid;
+ }
+ /* DMA read with exec requeset is not supported. */
+ if (req->exe_req && req->rd_req) {
+ pr_err("Execution request not supported\n");
+ goto no_pasid;
+ }
if (!svm || svm->pasid != req->pasid) {
rcu_read_lock();
svm = ioasid_find(NULL, req->pasid, NULL);
--
2.25.1
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