Add CPUID subleaf capability to cpuctl/cpucontrol

[Konstantin Belousov]

On Fri, Mar 28, 2014 at 09:09:40PM +0800, Jia-Shiun Li wrote:
> On Thu, Mar 27, 2014 at 8:38 PM, Konstantin Belousov
> <kostikbel at gmail.com> wrote:
> >
> > From what I remember, in the multi-socket configuration Intel allows
> > CPUs to only differ by stepping. Due to this, I see only one possible
> > uses of executing CPUID on specific core, to get the stepping of the
> > package, to either test for the presence of the specific CPU bug, or to
> > select the proper microcode update.
> >
> > That said, I am curious why do you want this feature.
> 
> I'd like to do some CPU monitoring w/ MSR, thus need to identify CPU
> topology & CPU id on specific logical ones. I am sure there are some
> info from kernel, sysctl, etc. Even utilities readily available. But I
> am just curious on how it works anyway. With topology and MSR access
> via cpuctl, it should be able to do some monitoring from user space.
For the topology, my note about multi-socket configuration holds.
The advanced topology enumeration leafs must be identical on all
populated sockets for given machine.

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