Changeset 93397 in vbox for trunk/src/VBox

Timestamp:

Jan 21, 2022 1:21:21 PM (3 years ago)

Author:

vboxsync

Message:

VMM/NEMR3Native-darwin: Need to ensure that the A20 gate is actually enabled before running the guest in HV in each run or we might run into semi random memory corruptions, bugref:9044

File:

• trunk/src/VBox/VMM/VMMR3/NEMR3Native-darwin.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/VMMR3/NEMR3Native-darwin.cpp

@@ -2694 +2694 @@
 #endif
 
+    AssertReturn(NEMR3CanExecuteGuest(pVM, pVCpu), VERR_NEM_IPE_9);
+
     /*
      * Try switch to NEM runloop state.
@@ -2739 +2741 @@
             if (rcStrict == VINF_EM_RAW_TO_R3)
                 rcStrict = VINF_SUCCESS;
+            break;
+        }
+
+        /*
+         * Do not execute in HV if the A20 isn't enabled.
+         */
+        if (PGMPhysIsA20Enabled(pVCpu))
+        { /* likely */ }
+        else
+        {
+            rcStrict = VINF_EM_RESCHEDULE_REM;
+            LogFlow(("NEM/%u: breaking: A20 disabled\n", pVCpu->idCpu));
             break;
         }