linux-kernel - Re: [PATCH v13 6/8] x86/arch_prctl: Add ARCH_[GET|SET]

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Date:   Mon, 28 Nov 2016 08:13:49 -0800
From:   Kyle Huey <me@...ehuey.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Robert O'Callahan" <robert@...llahan.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Len Brown <len.brown@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Dmitry Safonov <dsafonov@...tuozzo.com>,
        David Matlack <dmatlack@...gle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Andi Kleen <andi@...stfloor.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH v13 6/8] x86/arch_prctl: Add ARCH_[GET|SET]_CPUID

On Mon, Nov 28, 2016 at 6:06 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Sun, 27 Nov 2016, Kyle Huey wrote:
>> +DEFINE_PER_CPU(u64, msr_misc_features_shadow);
>> +
>> +static void set_cpuid_faulting(bool on)
>> +{
>> +     u64 msrval;
>> +
>> +     DEBUG_LOCKS_WARN_ON(!irqs_disabled());
>
> The arch_prctl code path does not have interrupts disabled and there is no
> reason why it should have.

Yes, indeed. Removed.

- Kyle