linux-kernel - Re: [RFC PATCH 13/13] Documentation: Document PowerPC kernel DEXCR interface

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Message-Id: <CQZWS8VFIL3Q.G9POORQXDKE0@bobo>
Date:   Tue, 07 Mar 2023 15:40:53 +1000
From:   "Nicholas Piggin" <npiggin@...il.com>
To:     "Benjamin Gray" <bgray@...ux.ibm.com>,
        <linuxppc-dev@...ts.ozlabs.org>
Cc:     <ajd@...ux.ibm.com>, <linux-kernel@...r.kernel.org>,
        <linux-hardening@...r.kernel.org>, <cmr@...escreens.de>
Subject: Re: [RFC PATCH 13/13] Documentation: Document PowerPC kernel DEXCR
 interface

On Mon Nov 28, 2022 at 12:44 PM AEST, Benjamin Gray wrote:
> Describe the DEXCR and document how to interact with it via the
> prctl and sysctl interfaces.

Oh you've got the docs here, sorry. Thanks for that. I don't know enough
yet to give much useful feedback on the API. I think at least all the
mechanism stuff up to the prctl API looks pretty straightfoward so would
like to get that merged if we can.

Might need a bit more time and discussion on the API. Interestingly
because the hashchk aspect is architectural, we may not be able to
necessarily sanely enable that, because if it was disabled to start
out with, our callchain up to the prctl call I think would have no
return hashes set so we'd immediately fail on our first return.

Thanks,
Nick