Changeset 91422 in vbox for trunk/include/VBox/vmm

Timestamp:

Sep 28, 2021 7:39:10 AM (3 years ago)

Author:

vboxsync

Message:

VMM: Nested VMX: bugref:10092 Add CPUMArePaePdpesValid.

File:

• trunk/include/VBox/vmm/cpum.h (modified) (1 diff)

trunk/include/VBox/vmm/cpum.h

@@ -1764 +1764 @@
 }
 
+
+/**
+ * Tests if PAE PDPE ("PDPTE" in Intel nomenclature) entries are valid.
+ *
+ * @returns @c true if all PDPEs are valid, @c false otherwise.
+ * @param   paPdpes         Pointer to the 4 PAE PDPEs.
+ * @param   pidxInvalid     Where to store the index of the first invalid PDPE.
+ *                          Optional, can be NULL. Mainly used for diagnostics.
+ */
+DECLINLINE(bool) CPUMArePaePdpesValid(PCX86PDPE paPdpes, uint8_t *pidxInvalid)
+{
+    for (unsigned idx = 0; idx < X86_PG_PAE_PDPE_ENTRIES; idx++)
+    {
+        if (   !(paPdpes[idx].u & X86_PDPE_P)
+            || !(paPdpes[idx].u & X86_PDPE_PAE_MBZ_MASK))
+        { /* likely */ }
+        else
+        {
+            if (pidxInvalid)
+                *pidxInvalid = idx;
+            return false;
+        }
+    }
+    return true;
+}
+
+
 /**
  * Tests if the guest has AMD SVM enabled or not.