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

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Date: Tue, 9 Apr 2024 22:25:33 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Kees Cook <keescook@...omium.org>, Steven Rostedt <rostedt@...dmis.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-trace-kernel@...r.kernel.org" <linux-trace-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
	<akpm@...ux-foundation.org>, "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 <mingo@...hat.com>, Borislav Petkov
	<bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra
	<peterz@...radead.org>, "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
	"linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>, "Guenter
 Roeck" <linux@...ck-us.net>, Ross Zwisler <zwisler@...gle.com>,
	"wklin@...gle.com" <wklin@...gle.com>, Vineeth 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

>> I forgot to mention that this makes it trivial for any machine that doesn't
>> clear memory on soft-reboot, to enable console ramoops (to have access to
>> the last boot dmesg without needing serial).
>> 
>> I tested this on a couple of my test boxes and on QEMU, and it works rather
>> well.
>
> I've long wanted a "stable for this machine and kernel" memory region
> like this for pstore. It would make testing much easier.

Which systems does this work on? I'd assume that servers (and anything
else with ECC memory) would nuke contents while resetting ECC to clean
state.

-Tony