linux-kernel - Re: [PATCH 5/7] x86/bugs: Only harden syscalls when needed

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Message-ID: <0a718cd3-d0ff-48ab-8d16-d513d95563d3@citrix.com>
Date: Fri, 12 Apr 2024 11:36:04 +0100
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>,
 Alexandre Chartre <alexandre.chartre@...cle.com>,
 Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Sean Christopherson <seanjc@...gle.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Nikolay Borisov <nik.borisov@...e.com>, KP Singh <kpsingh@...nel.org>,
 Waiman Long <longman@...hat.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 5/7] x86/bugs: Only harden syscalls when needed

On 12/04/2024 6:20 am, Josh Poimboeuf wrote:
> On Thu, Apr 11, 2024 at 09:17:27PM -0700, Josh Poimboeuf wrote:
>> On Thu, Apr 11, 2024 at 08:57:42PM -0700, Josh Poimboeuf wrote:
>>> For similar reasons I'm thinking we should also remove the non-eIBRS
>>> version (SPECTRE_V2_LFENCE).
>> Actually I guess that's still the default mitigation for AMD so I'll
>> leave that one in.
> Never mind, I forgot that got deprecated for AMD.

And then became necessary on two Atoms, although I can't for the life of
of me find Intel's footnote about this in the maze of speculation docs...

~Andrew