Changeset 16552 in vbox for trunk/src/VBox/VMM/PATM

Timestamp:

Feb 6, 2009 3:41:53 PM (16 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

42493

Message:

Ignore patch writes that don't change anything

File:

• trunk/src/VBox/VMM/PATM/CSAM.cpp (modified) (1 diff)

trunk/src/VBox/VMM/PATM/CSAM.cpp

@@ -1943 +1943 @@
     Log(("CSAMCodePageWriteHandler: write to %RGv size=%zu\n", GCPtr, cbBuf));
 
+    if (    PAGE_ADDRESS(pvPtr) == PAGE_ADDRESS((uintptr_t)pvPtr + cbBuf - 1)
+         && !memcmp(pvPtr, pvBuf, cbBuf))
+    {
+        Log(("CSAMCodePageWriteHandler: dummy write -> ignore\n"));
+        return VINF_PGM_HANDLER_DO_DEFAULT;
+    }
+
     if (VM_IS_EMT(pVM))
     {