linux-hardening - RE: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently

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Message-ID: <SJ1PR11MB60838302CF7A80B660B30F2AFC072@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Tue, 9 Apr 2024 23:52:27 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Kees Cook <keescook@...omium.org>
CC: Steven Rostedt <rostedt@...dmis.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-trace-kernel@...r.kernel.org"
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	Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers
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	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
	<vbabka@...e.cz>, Lorenzo Stoakes <lstoakes@...il.com>, "linux-mm@...ck.org"
	<linux-mm@...ck.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
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	<linux-hardening@...r.kernel.org>, Guenter Roeck <linux@...ck-us.net>, "Ross
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 Remanan Pillai <vineeth@...byteword.org>, Joel Fernandes
	<joel@...lfernandes.org>, Suleiman Souhlal <suleiman@...gle.com>, "Linus
 Torvalds" <torvalds@...uxfoundation.org>, Catalin Marinas
	<catalin.marinas@....com>, Will Deacon <will@...nel.org>
Subject: RE: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map
 pstore consistently

> Do ECC servers wipe their RAM by default? I know that if you build with
> CONFIG_RESET_ATTACK_MITIGATION=y on an EFI system that supports the
> MemoryOverwriteRequestControl EFI variable you'll get a RAM wipe...

I know that after I've been running RAS tests that inject ECC errors into thousands of
pages, those errors all disappear after a reboot.

I think some BIOS have options to speed up boot by skipping memory initialization.
I don't know if anyone makes that the default mode.

-Tony