linux-kernel - Re: [PATCH 4/5] x86/svm: Direct access to MSR_IA32_SPEC

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Message-ID: <1515751984.22302.423.camel@infradead.org>
Date:   Fri, 12 Jan 2018 10:13:04 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ashok Raj <ashok.raj@...el.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>
Subject: Re: [PATCH 4/5] x86/svm: Direct access to MSR_IA32_SPEC_CTRL

On Fri, 2018-01-12 at 10:58 +0100, Peter Zijlstra wrote:
> I disagree, and if you worry about that, we should write a testcase. But
> we rely on GCC for correct code generation in lots of places, this isn't
> different.

It's different because it's not a *correctness* issue... unless we let
you make it one.
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