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Message-ID: <202404091519.B7B2221@keescook>
Date: Tue, 9 Apr 2024 15:19:48 -0700
From: Kees Cook <keescook@...omium.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
Masami Hiramatsu <mhiramat@...nel.org>,
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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,
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Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
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"H. Peter Anvin" <hpa@...or.com>,
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"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
linux-hardening@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
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Vineeth Remanan Pillai <vineeth@...byteword.org>,
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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, Apr 09, 2024 at 05:23:58PM -0400, Steven Rostedt wrote:
> On Tue, 09 Apr 2024 17:02:54 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
>
> > memmap=12M*4096:oops ramoops.mem_name=oops
>
> 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.
--
Kees Cook
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