kfdtest: Workaround delayed page faults

Delayed page faults from a terminated process can be attributed to the
next process with the same PASID. Work around that by adding a delay
after the Exception tests to allow the kernel to clean up any fault
storms before the next test.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Change-Id: Id310c13ea9eb92b04d37b95d91a0dd60bd9954e5

tests/kfdtest/src/KFDExceptionTest.cpp

@@ -47,6 +47,11 @@ void KFDExceptionTest::TearDown() {
 
     KFDBaseComponentTest::TearDown();
 
+    // WORKAROUND: This needs to be fixed in the kernel
+    // Wait 500ms for the kernel to process any fault storms before the
+    // next test to avoid reporting incorrect faults in the next test.
+    Delay(500);
+
     ROUTINE_END
 }