On Fri, Jun 19, 2020 at 08:48:47AM -0700, Andy Lutomirski wrote:
> Boris, it wouldn’t be totally crazy for cpuinfo to learn to
> distinguish between “your platform has this feature but Linux
> isn’t using it” and “your platform doesn’t have this feature
> in the first place”. And I suppose there’s this extra silly state
> “your platform has this feature, but your firmware didn’t enable
> it”. This would be a big job.
Well, I believe all the kernel can do is supply bits of information -
just like MSRs - and depending on the settings of those bits, userspace
can decide what the situation is. For example:
bit 0 - CPUID support
bit 1 - BIOS enabled
bit 2 - quirk applied
bit 3 - microcode fixes present
...
and so on.
It needs a proper definition though and userspace to say, yes, we want
that and that is useful for us.
Where it ends up is then beside the point - /proc/cpuinfo,
/sys/devices/system/cpu, whatever...
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
