From: David Laight <David.Laight@ACULAB.COM>
To: 'Jue Wang' <juew@google.com>, Tony Luck <tony.luck@intel.com>,
"Borislav Petkov" <bp@alien8.de>
Cc: "x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"patches@lists.linux.dev" <patches@lists.linux.dev>
Subject: RE: [PATCH] x86/mce: work around an erratum on fast string copy instructions.
Date: Wed, 16 Feb 2022 09:04:35 +0000 [thread overview]
Message-ID: <3288f39e32f04d67a875775414dd1c14@AcuMS.aculab.com> (raw)
In-Reply-To: <20220216055629.1542654-1-juew@google.com>
From: Jue Wang
> Sent: 16 February 2022 05:56
>
> The fast string copy instructions ("REP; MOVS*") could consume an
> uncorrectable memory error in the cache line _right after_ the
> desired region to copy and raise an MCE.
s/consume/trap due to/
Isn't this just putting off the inevitable panic when the
following cache line is accesses for real?
Or is this all due to that pseudo dynamic memory (xpoint?) that is
byte addressable but only really has the quality of a diak?
It which case I thought it wasn't actually usable for
normal memory anyway - so the copies are all ones which can fault.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2022-02-16 9:04 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 4:36 [RFC] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks Jue Wang
2022-02-07 18:23 ` Luck, Tony
2022-02-07 18:52 ` Borislav Petkov
2022-02-07 19:24 ` Luck, Tony
2022-02-07 20:27 ` Borislav Petkov
2022-02-07 21:07 ` Luck, Tony
2022-02-07 21:20 ` Borislav Petkov
2022-02-07 21:51 ` Luck, Tony
2022-02-08 15:04 ` Jue Wang
2022-02-08 15:09 ` [PATCH] " Jue Wang
2022-02-11 20:08 ` Jue Wang
2022-02-11 20:18 ` Borislav Petkov
2022-02-11 20:23 ` Jue Wang
2022-02-15 18:42 ` Luck, Tony
2022-02-15 22:08 ` Borislav Petkov
2022-02-15 22:22 ` Luck, Tony
2022-02-16 10:28 ` Borislav Petkov
2022-02-16 15:50 ` Jue Wang
2022-02-16 18:02 ` Borislav Petkov
2022-02-16 18:41 ` Luck, Tony
2022-02-16 18:52 ` Borislav Petkov
2022-02-16 18:58 ` Luck, Tony
2022-02-16 18:59 ` Jue Wang
2022-02-16 21:53 ` [PATCH] x86/mce: work around an erratum on fast string copy instructions Jue Wang
2022-02-17 16:30 ` Borislav Petkov
2022-02-17 16:32 ` Borislav Petkov
2022-02-18 1:32 ` [PATCH v2] " Jue Wang
2022-02-18 15:07 ` Borislav Petkov
2022-02-18 16:03 ` Jue Wang
2022-02-18 16:14 ` Borislav Petkov
2022-02-18 16:21 ` Jue Wang
2022-02-18 17:16 ` Borislav Petkov
2022-02-18 17:39 ` Jue Wang
[not found] ` <CAPcxDJ7=hCz6KRih4OBVv-k8WLcBL4n+VSpeP_zky7Uunq89zg@mail.gmail.com>
2022-02-18 22:05 ` Borislav Petkov
2022-02-18 22:38 ` Luck, Tony
2022-02-18 22:58 ` Borislav Petkov
2022-02-18 17:58 ` Luck, Tony
2022-02-19 18:09 ` [tip: ras/core] x86/mce: Work " tip-bot2 for Jue Wang
2022-02-16 5:40 ` [PATCH] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks Jue Wang
2022-02-16 5:56 ` [PATCH] x86/mce: work around an erratum on fast string copy instructions Jue Wang
2022-02-16 9:04 ` David Laight [this message]
2022-02-16 15:33 ` Jue Wang
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