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

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Message-ID: <20240409191615.3e3b01d3@gandalf.local.home>
Date: Tue, 9 Apr 2024 19:16:15 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Luck, Tony" <tony.luck@...el.com>
Cc: Kees Cook <keescook@...omium.org>, "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

On Tue, 9 Apr 2024 22:25:33 +0000
"Luck, Tony" <tony.luck@...el.com> wrote:

> >> 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.
>

Well I tested it on a couple of chromebooks, a test box and a laptop (as
well as QEMU). I know that ramoops has an ecc option. I'm guessing that
would help here (but I'd have to defer to others to answer that).

-- Steve