[MODERATED] Re: [PATCH v4 04/10] TAAv4 4

On Mon, Sep 23, 2019 at 09:13:12PM +0200, speck for Greg KH wrote:
> > > 
> > > $ ls /sys/devices/cpu/
> > > allow_tsx_force_abort  format                      power      type
> > > caps                   freeze_on_smi               rdpmc      uevent
> > > events                 perf_event_mux_interval_ms  subsystem
> > > 
> > > Oh look, a tsx-specific cpu sysfs file on my laptop...
> > 
> > Yes, but these are PMU attributes.
> > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/x86/events/core.c#L2211
> > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/x86/events/core.c#L1831
> 
> Ick, ok, then no, you are back to putting it in /sys/devices/system/cpu/
> then.
> 
> But that "feels" wrong given there really isn't anything else in that
> directory for cpu features like this, they are all buried in the
> individual cpuX directories, right?
> 
> Is there any other cpu feature you can turn on/off like this today in
> the system that is controlled in sysfs?  If so, where is it at?

I don't know if it counts, but there is one for turning SMT on/off.

	$ echo off > /sys/devices/system/cpu/smt/control

Thanks,
Pawan