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Date:   Sun, 17 Jun 2018 09:35:31 -0700
From:   Andi Kleen <andi@firstfloor.org>
To:     Keno Fischer <keno@juliacomputing.com>
Cc:     linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@suse.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andi Kleen <andi@firstfloor.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Kyle Huey <khuey@kylehuey.com>,
        Robert O'Callahan <robert@ocallahan.org>
Subject: Re: [RFC PATCH] x86/arch_prctl: Add ARCH_SET_XCR0 to mask XCR0
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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