diff options
Diffstat (limited to 'src/VBox/VMM/VMMAll/TMAllCpu.cpp')
| -rw-r--r-- | src/VBox/VMM/VMMAll/TMAllCpu.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/VBox/VMM/VMMAll/TMAllCpu.cpp b/src/VBox/VMM/VMMAll/TMAllCpu.cpp index f41adfa4..7dc770cc 100644 --- a/src/VBox/VMM/VMMAll/TMAllCpu.cpp +++ b/src/VBox/VMM/VMMAll/TMAllCpu.cpp @@ -4,7 +4,7 @@ */ /* - * Copyright (C) 2006-2007 Oracle Corporation + * Copyright (C) 2006-2012 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; @@ -320,8 +320,10 @@ DECLINLINE(uint64_t) tmCpuTickGetInternal(PVMCPU pVCpu, bool fCheckTimers) else 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); pVCpu->tm.s.u64TSCLastSeen += 64; /* @todo choose a good increment here */ |