Re: MSR support for x86

Stephan Meyer (
Sat, 1 Mar 1997 08:13:46 +0100 (MET)

On 28 Feb 1997, H. Peter Anvin wrote:
> > This is an interesting suggestion :)
> > If we implement this, it should be tightly secured since any user could
> > mess around with the 2nd level cache. A possible application could be a
> > CPU manager!
> >
> I think letting any non-root user messing with the MSRs or anything
> like that is asking for trouble in a big way. /dev/msr definitely
> should be a root-only device!

I think you are definitely right. :)

BTW, who is maintaining the /dev/MAKEDEV script? IMHO /dev/msr should be
added to it with permissions set to crw-------.

> -hpa

Cheers, Stephan

Stephan Meyer