invalid rdmsr instructions do not cause a #GP fault in the guest

[Tracy Camp]

executing rdmsr with explicitly or implicitly invalid MSR values does not cause a #GP fault to be reflected to the guest. I primarily have noticed this within a device driver running under windows 2008r2, but this seems to be a more fundamental feature of the architecture that should not have an OS dependency.

[Sander van Leeuwen]

True, but that's not likely to be the cause of any real world problems. Generating a #GP would cause an infinite amount of problems as many different CPU models support even more different MSRs.

[Frank Mehnert]

The behavior was changed in VBox 4.3.x.