> I'd like to know which requirements the MSR driver needs to meet in order
> to get included in the 2.1.x and 2.2.x kernels. I have received some
> suggestions now and I myself can't really decide on the quality of each
> solution.
>
> a) character device
>
> This is the currently implemented method.
> It was criticized by Linus and I get the problem. I believe that
> this way, it would be very easy to grant specific users access to
> the MSR registers.
Why was it criticized? IMHO it's the best solution because it gives
all the flexibility of unix permissions for the access control.
AFAIK OpenBSD does it the same way.
-Andi