test fault-on-AP and affinity; report the faulting core

fault-ap-df pins a #DF to an AP (its own IST must catch it); affinity checks a pinned task never migrates. onException now names the core, so an AP fault is attributed and shown contained. Both teeth-checked.

test/qemu_test.py

@@ -119,6 +119,11 @@ CASES = [
      "smp":    4,
      "expect": r"DANOS-TEST-RESULT: PASS",
      "fail":   r"DANOS-TEST-RESULT: FAIL"},
+    # Affinity: a pinned task must never migrate off its core.
+    {"name": "affinity",
+     "smp":    4,
+     "expect": r"DANOS-TEST-RESULT: PASS",
+     "fail":   r"DANOS-TEST-RESULT: FAIL"},
     # Stress the big kernel lock across cores; heavier, so a longer timeout.
     {"name": "smp-stress",
      "smp":    4,
@@ -133,6 +138,12 @@ CASES = [
     {"name": "fault-ud", "expect": r"invalid opcode \(vector 6\)"},
     {"name": "fault-pf", "expect": r"page fault \(vector 14\)"},
     {"name": "fault-df", "expect": r"double fault \(vector 8\)"},
+    # Fault on an application processor: a #DF pinned to core 1 must be caught by that
+    # core's own IST (N >= 1), proving per-core TSS works; a broken one triple-faults.
+    {"name": "fault-ap-df",
+     "smp":    4,
+     "expect": r"core [1-9]\d*: double fault \(vector 8\)",
+     "fail":   r"could not pin"},
     {"name": "fault-nx",
      "expect": r"page fault \(vector 14\)",
      "fail":   r"NX not enforced"},