Re: [PATCH] x86/rapl: Do not load in a guest

Borislav Petkov
2015-12-04T18:28:18Z

On Fri, Dec 04, 2015 at 10:16:10AM -0800, Jacob Pan wrote:
> CPU model detection is the first level checking.

And in the case of RAPL, the only checking you can do. This is why it
should've had a CPUID bit.

> The error is about no valid domains (e.g. counters not working). So
> the error on minnowboard board could be a real problem if you expect
> to use RAPL.

Right, and if you need to disable it there, you would need to add a
quirk table looking at DMI strings or so. A CPUID bit might've been a
bit better if BIOS update would clear it on those boards. Then, sw won't
even try to load there.

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.