Only check instruction-fetch data triggers on complete instructions

Signed-off-by: Andrew Waterman <andrew@sifive.com>

riscv/mmu.cc

@@ -137,15 +137,7 @@ mmu_t::insn_parcel_t mmu_t::fetch_slow_path(reg_t vaddr)
     refill_tlb(vaddr, paddr, (char*)host_addr, FETCH);
   }
 
-  auto res = perform_intrapage_fetch(vaddr, host_addr, paddr);
-
-  if (!check_triggers_fetch)
-    return res;
-
-  check_triggers(triggers::OPERATION_EXECUTE, vaddr,
-    access_info.effective_virt, sizeof(insn_parcel_t), res);
-
-  return res;
+  return perform_intrapage_fetch(vaddr, host_addr, paddr);
 }
 
 static reg_t reg_from_bytes(size_t len, const uint8_t* bytes)

riscv/mmu.h

@@ -545,6 +545,12 @@ private:
       length = insn_length(insn);
     }
 
+    if (check_triggers_fetch) {
+      auto access_info = generate_access_info(addr, FETCH, {});
+      check_triggers(triggers::OPERATION_EXECUTE, addr,
+        access_info.effective_virt, length, insn);
+    }
+
     return std::make_tuple(insn, length);
   }