Changeset 16921 in vbox for trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp

Timestamp:

Feb 18, 2009 4:31:09 PM (16 years ago)

Author:

vboxsync

Message:

VBOX_WITH_PGMPOOL_PAGING_ONLY: updates

File:

• trunk/src/VBox/VMM/VMMAll/PGMAllPool.cpp (modified) (2 diffs)

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

@@ -1201 +1201 @@
 }
 
+#ifdef VBOX_WITH_PGMPOOL_PAGING_ONLY
+/**
+ * Checks if the page is the active CR3 or is one of the four PDs of a PAE PDPT
+ *
+ * @returns VBox status code (appropriate for GC return).
+ * @param   pVM         VM Handle.
+ * @param   pPage       PGM pool page
+ */
+bool pgmPoolIsActiveRootpage(PVM pVM, PPGMPOOLPAGE pPage)
+{
+    /* First check the simple case. */
+    if (pPage == pVM->pgm.s.CTX_SUFF(pShwPageCR3))
+    {
+        LogFlow(("pgmPoolIsActiveRootpage found CR3 root\n"));
+        pPage->cModifications = 0; /* reset counter */
+        return true;
+    }
+
+    switch (PGMGetShadowMode(pVM))
+    {
+        case PGMMODE_PAE:
+        case PGMMODE_PAE_NX:
+        {
+            switch (pPage->enmKind)
+            {
+                case PGMPOOLKIND_PAE_PD_FOR_PAE_PD:
+                case PGMPOOLKIND_PAE_PD0_FOR_32BIT_PD:
+                case PGMPOOLKIND_PAE_PD1_FOR_32BIT_PD:
+                case PGMPOOLKIND_PAE_PD2_FOR_32BIT_PD:
+                case PGMPOOLKIND_PAE_PD3_FOR_32BIT_PD:
+                {
+                    PX86PDPT pPdpt = pgmShwGetPaePDPTPtr(&pVM->pgm.s);
+                    Assert(pPdpt);
+
+                    for (unsigned i=0;i<X86_PG_PAE_PDPE_ENTRIES;i++)
+                    {
+                        if (    pPdpt->a[i].n.u1Present
+                            &&  pPage->Core.Key == pPdpt->a[i].u & X86_PDPE_PG_MASK)
+                        {
+                            LogFlow(("pgmPoolIsActiveRootpage found PAE PDPE root\n"));
+                            pPage->cModifications = 0; /* reset counter */
+                            return true;
+                        }
+                    }
+                    break;
+                }
+            }
+
+            break;
+        }
+    }
+
+    return false;
+}
+#endif
 
 /**
@@ -1239 +1294 @@
     bool fReused = false;
     if (    (   pPage->cModifications < 48   /** @todo #define */ /** @todo need to check that it's not mapping EIP. */ /** @todo adjust this! */
-#ifndef VBOX_WITH_PGMPOOL_PAGING_ONLY
+#ifdef VBOX_WITH_PGMPOOL_PAGING_ONLY
+             || pgmPoolIsActiveRootpage(pVM, pPage)
+#else
              || pPage->fCR3Mix
 #endif