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

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Message-ID: <20200420141320.GC608746@tassilo.jf.intel.com>
Date:   Mon, 20 Apr 2020 07:13:20 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     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@...or.com" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "bp@...en8.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@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 00/17] Enable FSGSBASE instructions

> Now maybe no one cares about #4.  

Yes noone cares. Selectors are largely obsolete.

> 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.

Thanks,
-Andi