linux-kernel - Re: [PATCH v9 00/17] Enable FSGSBASE instructions

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Message-ID: <87y2qqaxkp.fsf@nanos.tec.linutronix.de>
Date:   Mon, 20 Apr 2020 19:14:46 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <ak@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>
Cc:     Sasha Levin <sashal@...nel.org>,
        "Bae\, Chang Seok" <chang.seok.bae@...el.com>,
        "Metzger\, Markus T" <markus.t.metzger@...el.com>,
        "hpa\@zytor.com" <hpa@...or.com>, "bp\@alien8.de" <bp@...en8.de>,
        "Hansen\, Dave" <dave.hansen@...el.com>,
        "Luck\, Tony" <tony.luck@...el.com>,
        Pedro Alves <palves@...hat.com>,
        Simon Marchi <simark@...ark.ca>,
        "Shankar\, Ravi V" <ravi.v.shankar@...el.com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 00/17] Enable FSGSBASE instructions

Andi Kleen <ak@...ux.intel.com> writes:
>> the *gdb developers* don't care.  But gdb isn't exactly a good example
>> of a piece of software that tries to work correctly when dealing with
>> unusual software.  Maybe other things like rr will care more.  It
>
> rr is used to replay modern software, and modern software
> doesn't care about selectors, thus rr doesn't care either.
>
> Please stop the FUD.

There is absolutely no FUD. Being careful about not breaking existing
user space is a legitimate request.

It's up to those who change the ABI to prove that it does not matter and
not up to the maintainers to figure it out.

This sits in limbo for months now just because Intel doesn't get it's
homework done.

Stop making false accusations and provide factual information instead.

Thanks,

        tglx