Changeset 74097 in vbox for trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp

Timestamp:

Sep 6, 2018 2:43:53 AM (6 years ago)

Author:

vboxsync

Message:

VMM/CPUM: Nested VMX: bugref:9180 Disallow nested hwvirt on 32-bit hosts.

File:

• trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp

@@ -3949 +3949 @@
         /** @cfgm{/CPUM/NestedHWVirt, bool, false}
          * Whether to expose the hardware virtualization (VMX/SVM) feature to the guest.
-         * The default is false, and when enabled requires nested paging and AMD-V or
-         * unrestricted guest mode.
+         * The default is false, and when enabled requires a 64-bit CPU with support for
+         * nested-paging and AMD-V or unrestricted guest mode.
          */
         rc = CFGMR3QueryBoolDef(pCpumCfg, "NestedHWVirt", &pConfig->fNestedHWVirt, false);
@@ -3966 +3966 @@
             pConfig->fNestedHWVirt = false;
         }
+
+#if HC_ARCH_BITS == 32
+        /* We don't support nested hardware virtualization on 32-bit hosts. */
+        if (pConfig->fNestedHWVirt)
+            return VMSetError(pVM, VERR_CPUM_INVALID_HWVIRT_CONFIG, RT_SRC_POS,
+                              "Cannot enable nested VT-x/AMD-V on a 32-bit host\n");
+#endif
     }