linux-kernel - Re: [PATCH v8 00/17] Enable FSGSBASE instructions

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Date:   Wed, 18 Sep 2019 21:02:20 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "gdb-patches@...rceware.org" <gdb-patches@...rceware.org>,
        Joel Brobecker <brobecker@...core.com>,
        Pedro Alves <palves@...hat.com>
Subject: Re: [PATCH v8 00/17] Enable FSGSBASE instructions


> On Sep 12, 2019, at 21:10, Andy Lutomirski <luto@...nel.org> wrote:
> 
> I also think that, before this series can have my ack, it needs an actual gdb maintainer to chime in, publicly, and state that they have thought about and tested the ABI changes and that gdb still works on patched kernels with and without FSGSBASE enabled.  I realize that there were all kinds of discussions, but they were all quite theoretical, and I think that the actual patches need to be considered by people who understand the concerns.  Specific test cases would be nice, too.
> 
> Finally, I wrote up some notes here:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/fixes&id=70a7d284989e3539ee84f9d709d6450099f773fb
> 
> I want to make sure that they're accounted for, and that patch should possibly be applied.  The parent (broken link, but should fix itself soon):
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?h=x86/fixes&id=166324e907f8a71c823b41bbc2e1b5bc711532d8
> 
> may also help understand the relevant code.

Adds GDB folks and here is a link to the patch0 entry in this series for them:

https://lore.kernel.org/lkml/1568318818-4091-1-git-send-email-chang.seok.bae@intel.com/

Thanks,
Chang