linux-kernel - Re: [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto capabilities

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Date:   Fri, 4 Feb 2022 17:28:43 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Limonciello, Mario" <mario.limonciello@....com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Martin Fernandez <martin.fernandez@...ypsium.com>,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, ardb@...nel.org,
        dvhart@...radead.org, andy@...radead.org,
        gregkh@...uxfoundation.org, rafael@...nel.org, rppt@...nel.org,
        akpm@...ux-foundation.org, daniel.gutson@...ypsium.com,
        hughsient@...il.com, alex.bazhaniuk@...ypsium.com,
        alison.schofield@...el.com, keescook@...omium.org
Subject: Re: [PATCH v6 6/6] drivers/node: Show in sysfs node's crypto
 capabilities

On Fri, Feb 04, 2022 at 10:23:22AM -0600, Limonciello, Mario wrote:
> > > > As there is interest in seeing these capabilities from userspace, it

This needs to be explained in a lot more detail: why, what is going to
use it, how, etc.

We don't do user-visible APIs just because.

> As Tom agreed in previous post, Boris is mistaken here.  I just double
> checked on my side on a workstation that supports SME and comparing
> /proc/cpuinfo before and after SME is enabled via mem_encrypt=on.  I
> confirmed that nothing changed.

Then we should clear that "sme" flag if memory encryption is not
enabled. Like we do for all other flags.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette