Changeset 46125 in vbox for trunk/src/VBox/VMM/VMMAll

Timestamp:

May 16, 2013 1:59:37 PM (12 years ago)

Author:

vboxsync

Message:

PGM: Optimized virtual memory searching by skipping empty tables.

File:

• trunk/src/VBox/VMM/VMMAll/PGMAll.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/PGMAll.cpp

@@ -1415 +1415 @@
 
 /**
+ * Performs a guest page table walk.
+ *
+ * The guest should be in paged protect mode or long mode when making a call to
+ * this function.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS on success.
+ * @retval  VERR_PAGE_TABLE_NOT_PRESENT on failure.  Check pWalk for details.
+ * @retval  VERR_PGM_NOT_USED_IN_MODE if not paging isn't enabled. @a pWalk is
+ *          not valid, except enmType is PGMPTWALKGSTTYPE_INVALID.
+ *
+ * @param   pVCpu       The current CPU.
+ * @param   GCPtr       The guest virtual address to walk by.
+ * @param   pWalk       Where to return the walk result. This is valid on some
+ *                      error codes as well.
+ */
+int pgmGstPtWalk(PVMCPU pVCpu, RTGCPTR GCPtr, PPGMPTWALKGST pWalk)
+{
+    VMCPU_ASSERT_EMT(pVCpu);
+    switch (pVCpu->pgm.s.enmGuestMode)
+    {
+        case PGMMODE_32_BIT:
+            pWalk->enmType = PGMPTWALKGSTTYPE_32BIT;
+            return PGM_GST_NAME_32BIT(Walk)(pVCpu, GCPtr, &pWalk->u.Legacy);
+
+        case PGMMODE_PAE:
+        case PGMMODE_PAE_NX:
+            pWalk->enmType = PGMPTWALKGSTTYPE_PAE;
+            return PGM_GST_NAME_PAE(Walk)(pVCpu, GCPtr, &pWalk->u.Pae);
+
+#if !defined(IN_RC)
+        case PGMMODE_AMD64:
+        case PGMMODE_AMD64_NX:
+            pWalk->enmType = PGMPTWALKGSTTYPE_AMD64;
+            return PGM_GST_NAME_AMD64(Walk)(pVCpu, GCPtr, &pWalk->u.Amd64);
+#endif
+
+        case PGMMODE_REAL:
+        case PGMMODE_PROTECTED:
+            pWalk->enmType = PGMPTWALKGSTTYPE_INVALID;
+            return VERR_PGM_NOT_USED_IN_MODE;
+
+#if defined(IN_RC)
+        case PGMMODE_AMD64:
+        case PGMMODE_AMD64_NX:
+#endif
+        case PGMMODE_NESTED:
+        case PGMMODE_EPT:
+        default:
+            AssertFailed();
+            pWalk->enmType = PGMPTWALKGSTTYPE_INVALID;
+            return VERR_PGM_NOT_USED_IN_MODE;
+    }
+}
+
+
+/**
  * Checks if the page is present.
  *