linux-kernel - Re: [PATCH 14/15] x86/fsgsbase/64: Support legacy behavior when FS/GS updated by ptracer

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Message-ID: <CALCETrUZk0m2-aJpzBbUR1-rSZkKCX6hKS3K3O_3LQJSkKKKGg@mail.gmail.com>
Date:   Thu, 22 Mar 2018 16:53:26 +0000
From:   Andy Lutomirski <luto@...nel.org>
To:     "Bae, Chang Seok" <chang.seok.bae@...el.com>
Cc:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Metzger, Markus T" <markus.t.metzger@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 14/15] x86/fsgsbase/64: Support legacy behavior when FS/GS
 updated by ptracer

On Thu, Mar 22, 2018 at 4:46 PM, Bae, Chang Seok
<chang.seok.bae@...el.com> wrote:
>> But your patch doesn't actually do this, since gdb will just do
>> SETREGS anyway, right?
> GDB does SETREGS on any exclusive (FS/GS) updates in inferior call.
>
>
>

This means that your patch has exactly the same effect as the code in
my git tree, right?  Then let's stick with something like what's in my
git tree, since it's far simpler.