Opened 11 years ago
Closed 11 years ago
#12649 closed defect (obsolete)
BMI2 cpuid feature mistakenly enabled in VM
| Reported by: | Wim Heirman | Owned by: | |
|---|---|---|---|
| Component: | other | Version: | VirtualBox 4.3.6 |
| Keywords: | Cc: | ||
| Guest type: | Linux | Host type: | Windows |
Description
When running VirtualBox on a Haswell i5-3427U, the BMI2 cpuid feature bit is turned on in the VM while it is off on the host. Applications running in the VM therefore think the CPU supports instructions such as SHLX, which it doesn't, and generate illegal instruction traps.
CPU: Intel(R) Core(TM) i5-3427U CPU @ 1.80GHz
Host: Windows 8
VM: Ubuntu 13.10
Change History (2)
comment:1 by , 11 years ago
comment:2 by , 11 years ago
| Resolution: | → obsolete |
|---|---|
| Status: | new → closed |
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I cannot confirm this. Please attach a VBox.log file of such a VM session. And which application did you execute which wrongly assumed that the BMI2 bit is set? Could you also attach the output of
as well as the output of
executed inside your guest? You might need to install the 'cpuid' package to do so.