linux-kernel - Re: [RFC PATCH 7/8] crypto: x86/aes-kl - Support AES algorithm using Key Locker instructions

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Message-ID: <61FFFEA5-3DD2-4625-9F3A-B7A589B92D95@intel.com>
Date:   Fri, 18 Dec 2020 10:34:28 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Sun, Ning" <ning.sun@...el.com>,
        "Dwarakanath, Kumar N" <kumar.n.dwarakanath@...el.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 7/8] crypto: x86/aes-kl - Support AES algorithm using
 Key Locker instructions


> On Dec 18, 2020, at 19:11, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> *groan*, so what actual version of binutils is needed and why is this
> driver important enough to build on ancient crud to warrant all this
> gunk?

The new Key Locker instructions look to be added a few month ago [1].
But the latest binutils release (2.35.1) does not include them yet.

I’m open to drop the macros if there is any better way to define them
without binutils support.

Thanks,
Chang

[1] https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c4694f172b51a2168b8cc15109ab1b97fc0bcb9c