linux-kernel - Re: [PATCH 06/18] x86, barrier: stop speculation for failed access

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Message-ID: <20180108182138.kzdwkdwmhc3564s2@gmail.com>
Date:   Mon, 8 Jan 2018 19:21:38 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Willy Tarreau <w@....eu>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Network Development <netdev@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 06/18] x86, barrier: stop speculation for failed access_ok


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Sun, Jan 07, 2018 at 06:24:11PM -0800, Alexei Starovoitov wrote:
> > How about:
> > CONFIG_SPECTRE1_WORKAROUND_INDEX_MASK
> > CONFIG_SPECTRE1_WORKAROUND_LOAD_FENCE
> 
> INSTRUCTION_FENCE if anything. LFENCE for Intel (and now also for AMD as
> per 0592b0bce169) is a misnomer, IFENCE would be a better name for it.

Btw., we should probably propagate that naming to most places and only point it 
out in comments/documentation that Intel/AMD calls this CPU functionality 'LFENCE' 
for historic reasons and that the opcode got stolen for the Spectre fixes.

Thanks,

	Ingo