linux-kernel - Re: [PATCH v3 08/10] x86/setcpuid: Add kernel option setcpuid

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Message-ID: <81d7b72e-1f8d-de0f-be42-0be7260f48ee@intel.com>
Date:   Tue, 12 Feb 2019 08:50:28 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Fenghua Yu <fenghua.yu@...el.com>, Borislav Petkov <bp@...en8.de>,
        Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v3 08/10] x86/setcpuid: Add kernel option setcpuid

On 2/12/19 8:48 AM, Peter Zijlstra wrote:
>>> IFF clearcpuid lives, it should also employ CPUID faulting and clear it
>>> for userspace too.
>> We have it already,
> D'0h right, I thought that was introduced here, but that's just
> extending it to multiple arguments.

... and making it take strings in addition to numbers so folks can use
the strings they see in /proc/cpuinfo.