TMAllCpu.cpp

Timestamp:

Mar 6, 2013 3:08:46 PM (12 years ago)

Author:

vboxsync

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

84135

Message:

TM: Do not return the same value, either.

File:

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

-              r44932
+              r44933
             u64 = ASMReadTSC();
+        /* Never return a value lower than what the guest has already seen. */
+        if (u64 < pVCpu->tm.s.u64TSCLastSeen)
+        /* Always return a value higher than what the guest has already seen. */
+        if (RT_LIKELY(u64 > pVCpu->tm.s.u64TSCLastSeen))
+            pVCpu->tm.s.u64TSCLastSeen = u64;
+        else
+        {
             STAM_COUNTER_INC(&pVM->tm.s.StatTSCUnderflow);
 …
             u64 = pVCpu->tm.s.u64TSCLastSeen;
+        }
-        else
-            pVCpu->tm.s.u64TSCLastSeen = u64;
+    }
     else

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