linux-kernel - Re: [PATCH v2 2/2] x86/sgx: Add sgx_nr_{all, free}

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Date:   Thu, 8 Apr 2021 11:01:07 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     linux-sgx@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] x86/sgx: Add sgx_nr_{all, free}_pages to the
 debugfs

On Thu, Apr 08, 2021 at 11:52:40AM +0300, Jarkko Sakkinen wrote:
> I think these attributes are quite useful information to have available so
> I'd go actually doing sysfs attributes and create
> Documentation/ABI/stable/sysfs-driver-sgx to document them.

  testing/
        This directory documents interfaces that are felt to be stable,
        as the main development of this interface has been completed.

This sounds better for a start. From Documentation/ABI/README.

> Given that they would go then to the sysfs directory of the driver, then
> probably the legit names for the attributes ought to be:
> 
> - nr_all_epc_pages
> - nr_free_epc_pages
> 
> What do you think?

Sounds ok to me.

> PS. One useful case that I forgot to mention is that I use these to give
> idea what I gave EPC size in the BIOS. Now my EPC is set to 32 MB, and
> these report 20 MB of EPC pages. It's because other metadata (e.g. EPCM
> containing page attributes) is also stored in this area.

Just remember to put yourself in the user's shoes and think whether they
make sense to her/him.

Thx.

-- 
Regards/Gruss,
    Boris.

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