SYSCALL instruction terminates guest => Fixed in SVN

[pellsson]

Issuing a SYSCALL instruction with EFER.SCE == 0 causes the virtual machine guest to gracefully terminate (with the "OK/Ignore"-dialog), rather than raising an #UD fault as you would expect.

I have not tested if the other #UD conditions (CS.L != 1 or EFER.LMA != 1 or LOCK-prefixed SYSCALL) raise the guest exception instead of terminating.

[Ramshankar Venkataraman]

Could you please try if this test build fixes the issue?

https://www.virtualbox.org/download/testcase/VirtualBox-4.3.13-93954-Win.exe (link expires in ~14 days)

[pellsson]

Absolutely. I will install and test the attached version some time early this weekend.

I'll get back to you once have I the results.

Thank you,

Pelle

[pellsson]

Hello ramshankar,

Sorry I was a bit delayed with my response.

I have now tested the version you gave me and it seems to have corrected the issue :)

#UD is correctly raised in guest context when I run SYSCALL with EFER.SCE = 0.

Thank you very much sir! Pelle.

[Ramshankar Venkataraman]

Great!

Thank you for confirming the fix. The fix will be available as part of the next maintenance release of VirtualBox.

[Frank Mehnert]

Fix is part of VBox 4.3.14.