linux-kernel - Re: [RFC PATCH] x86/arch_prctl: Add ARCH_SET

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Message-ID: <20180617163530.rvwf7fcukmoletgo@two.firstfloor.org>
Date:   Sun, 17 Jun 2018 09:35:31 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Keno Fischer <keno@...iacomputing.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andi Kleen <andi@...stfloor.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Kyle Huey <khuey@...ehuey.com>,
        Robert O'Callahan <robert@...llahan.org>
Subject: Re: [RFC PATCH] x86/arch_prctl: Add ARCH_SET_XCR0 to mask XCR0
 per-thread


Patch seems pointless if you can already control CPUID, which rr
supports. Just disable AVX512 in CPUID. All code using AVX should check
cpuid (or will fail anyways). 

-Andi