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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Andi Kleen <ak@linux.intel.com>, Don Porter <porter@cs.unc.edu>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Sasha Levin <sashal@kernel.org>, linux-kernel@vger.kernel.org,
        bp@alien8.de, luto@kernel.org, hpa@zytor.com,
        dave.hansen@intel.com, tony.luck@intel.com,
        ravi.v.shankar@intel.com, chang.seok.bae@intel.com
Subject: Re: Re: [PATCH v12 00/18] Enable FSGSBASE instructions
In-Reply-To: <20200523041928.GU499505@tassilo.jf.intel.com>
References: <20200511045311.4785-1-sashal@kernel.org> <0186c22a8a6be1516df0703c421faaa581041774.camel@linux.intel.com> <20200515164013.GF29995@sasha-vm> <c566b89cc3ef6c164160cc56a820abac3fd70839.camel@linux.intel.com> <20200518153407.GA499505@tassilo.jf.intel.com> <371e6a92cad25cbe7a8489785efa7d3457ecef3b.camel@linux.intel.com> <87v9ksvoaq.fsf@nanos.tec.linutronix.de> <20200519164853.GA19706@linux.intel.com> <7eb45e02-03bf-0af0-c915-794bf49d66d7@cs.unc.edu> <20200523041928.GU499505@tassilo.jf.intel.com>
Date:   Thu, 28 May 2020 12:36:12 +0200
Message-ID: <87a71spcrn.fsf@nanos.tec.linutronix.de>
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Andi,

Andi Kleen <ak@linux.intel.com> writes:
>> Setting the fs register in userspace is an essential feature for running
>> legacy code in SGX.  We have been following LKML discussions on this
>> instruction for years, and hoping this feature would be supported by Linux,
>
> If you need a feature you should comment on it. One of the reasons
> it took so long is that the users didn't speak up.

nice try to rewrite history.

You know very well that the only reason why FSGSBASE support is not
upstream is Intel.

It has absolutely nothing to do with users not speaking up, unless you
mean the Intel SGX people.

Thanks,

        tglx