linux-kernel - Re: [PATCH 5.18 01/11] Documentation: Add documentation for Processor MMIO Stale Data

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Date:   Tue, 14 Jun 2022 20:25:07 -0700
From:   Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 5.18 01/11] Documentation: Add documentation for
 Processor MMIO Stale Data

On Wed, Jun 15, 2022 at 08:06:37AM +0700, Bagas Sanjaya wrote:
>On 6/15/22 01:40, Greg Kroah-Hartman wrote:
>> +  .. list-table::
>> +
>> +     * - 'Not affected'
>> +       - The processor is not vulnerable
>> +     * - 'Vulnerable'
>> +       - The processor is vulnerable, but no mitigation enabled
>> +     * - 'Vulnerable: Clear CPU buffers attempted, no microcode'
>> +       - The processor is vulnerable, but microcode is not updated. The
>> +         mitigation is enabled on a best effort basis.
>> +     * - 'Mitigation: Clear CPU buffers'
>> +       - The processor is vulnerable and the CPU buffer clearing mitigation is
>> +         enabled.
>> +
>> +If the processor is vulnerable then the following information is appended to
>> +the above information:
>> +
>> +  ========================  ===========================================
>> +  'SMT vulnerable'          SMT is enabled
>> +  'SMT disabled'            SMT is disabled
>> +  'SMT Host state unknown'  Kernel runs in a VM, Host SMT state unknown
>> +  ========================  ===========================================
>> +
>
>Why is list-table used in sysfs table instead of usual ASCII table in SMT
>vulnerabilities list above? I think using ASCII table in both cases is enough
>for the purpose.

Maybe you are right (and I am no expert in this), but quite a few
documents use list-table for sysfs status:

   https://www.kernel.org/doc/Documentation/admin-guide/hw-vuln/mds.rst
   https://www.kernel.org/doc/Documentation/admin-guide/hw-vuln/spectre.rst
   https://www.kernel.org/doc/Documentation/admin-guide/hw-vuln/tsx_async_abort.rst