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SubjectRe: [PATCH v3 08/10] x86/setcpuid: Add kernel option setcpuid
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On 2/4/19 9:49 AM, Thomas Gleixner wrote:
> On Fri, 1 Feb 2019, Fenghua Yu wrote:
>> This option behaves like existing kernel option clearcpuid.
>
> No it does NOT. clearcpuid allows to disable things.
>
> This allows to enable random CPUID bits without any sanity checking. Not
> going to happen. We made it clear in the past that functionality needs to
> be detectable by enumeration. We do quirks for broken crap, but this is
> just not how it works.

Hi Thomas,

I think we are trying persuade you like mentioned here:

> http://lkml.kernel.org/r/alpine.DEB.2.21.1807122153170.1597@nanos.tec.linutronix.de

But, we're not being very persuasive because we kinda forgot about the
"if and only if" condition that you mentioned.

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