From: Peter Zijlstra <peterz@infradead.org>
To: Ben Hutchings <ben@decadent.org.uk>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
1017425@bugs.debian.org,
"Martin-Éric Racine" <martin-eric.racine@iki.fi>,
stable@vger.kernel.org, regressions@lists.linux.dev,
"Daniel Sneddon" <daniel.sneddon@linux.intel.com>,
"Pawan Gupta" <pawan.kumar.gupta@linux.intel.com>
Subject: Re: [PATCH] x86/speculation: Avoid LFENCE in FILL_RETURN_BUFFER on CPUs that lack it
Date: Fri, 19 Aug 2022 10:47:21 +0200 [thread overview]
Message-ID: <Yv9OGVc+WpoDAB0X@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <Yv7aRJ/SvVhSdnSB@decadent.org.uk>
On Fri, Aug 19, 2022 at 02:33:08AM +0200, Ben Hutchings wrote:
> From: Ben Hutchings <benh@debian.org>
>
> The mitigation for PBRSB includes adding LFENCE instructions to the
> RSB filling sequence. However, RSB filling is done on some older CPUs
> that don't support the LFENCE instruction.
>
Wait; what? There are chips that enable the RSB mitigations and DONT
have LFENCE ?!?
next prev parent reply other threads:[~2022-08-19 8:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-19 0:33 [PATCH] x86/speculation: Avoid LFENCE in FILL_RETURN_BUFFER on CPUs that lack it Ben Hutchings
2022-08-19 8:47 ` Peter Zijlstra [this message]
2022-08-19 11:01 ` Peter Zijlstra
2022-08-19 11:33 ` Martin-Éric Racine
2022-08-19 11:38 ` Ben Hutchings
2022-08-19 12:15 ` Peter Zijlstra
2022-08-30 11:42 ` Martin-Éric Racine
2022-08-30 12:00 ` Peter Zijlstra
2022-08-30 12:18 ` Martin-Éric Racine
2022-08-30 13:35 ` Bug#1017425: " Salvatore Bonaccorso
2022-08-19 11:02 ` Ben Hutchings
-- strict thread matches above, loose matches on Subject: below --
2022-08-18 23:08 Ben Hutchings
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