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Message-ID: <714cf8b2-b02d-15d4-22a7-5e0dbec3c078@infradead.org>
Date: Mon, 9 Jan 2023 13:08:37 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Dave Hansen <dave.hansen@...el.com>, linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2] x86/retbleed: add "stuff" mode admin documentation
On 1/9/23 09:19, Dave Hansen wrote:
> On 1/9/23 08:08, Randy Dunlap wrote:
>> + stuff - Enables "stuffing" mode mitigation,
>> + which uses return thunking and call depth
>> + tracking. Only in effect if
>> + CONFIG_CALL_DEPTH_TRACKING is set and
>> + Spectre V2 mitigation mode is
>> + "retpoline".
>> + IBRS is fully secure mitigation but is
>> + more costly (slower) than stuffing.
>
> The "fully secure" thing makes me cringe a bit.
>
> I'd suggest saying:
>
> IBRS is a stronger mitigation
> but is more costly than stuffing
> (slower).
OK, will do (v3). :)
Thanks.
--
~Randy
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