linux-kernel - Re: [PATCH v5 3/3] x86/bugs: Add 'spectre

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Message-ID: <20240508051953.oz3q3hdvifo6lb7o@treble>
Date: Tue, 7 May 2024 22:19:53 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Daniel Sneddon <daniel.sneddon@...ux.intel.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pawan Gupta <pawan.kumar.gupta@...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>,
	Andrew Cooper <andrew.cooper3@...rix.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>, Ingo Molnar <mingo@...nel.org>,
	Maksim Davydov <davydov-max@...dex-team.ru>
Subject: Re: [PATCH v5 3/3] x86/bugs: Add 'spectre_bhi=vmexit' cmdline option

On Tue, May 07, 2024 at 07:58:07AM -0700, Daniel Sneddon wrote:
> On 5/6/24 22:30, Josh Poimboeuf wrote:
> > In cloud environments it can be useful to *only* enable the vmexit
> > mitigation and leave syscalls vulnerable.  Add that as an option.
> > 
> > This is similar to the old spectre_bhi=auto option which was removed
> > with the following commit:
> > 
> >   36d4fe147c87 ("x86/bugs: Remove CONFIG_BHI_MITIGATION_AUTO and spectre_bhi=auto")
> > 
> > with the main difference being that this has a more descriptive name and
> > is disabled by default.
> > 
> > Requested-by: Maksim Davydov <davydov-max@...dex-team.ru>
> > Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
> > ---
> 
> Does the KConfig option need to be updated to support this as well?

In general we don't provide a config option for every possible
mitigation cmdline option.  If someone requests it we could add it
later.

> Reviewed-by: Daniel Sneddon <daniel.sneddon@...ux.intel.com>

Thanks!

-- 
Josh