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

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Message-ID: <20240509133122.474130be@rorschach.local.home>
Date: Thu, 9 May 2024 13:31:22 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: "Guilherme G. Piccoli" <gpiccoli@...lia.com>, "Luck, Tony"
 <tony.luck@...el.com>, Kees Cook <keescook@...omium.org>, Joel Fernandes
 <joel@...lfernandes.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>, "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>, 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 Thu, 9 May 2024 00:00:23 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> I tried this approach and it unfortunately picks a different physical
> location every time :-(
> 
> So it is either adding to e820 tables or we create a new way to
> allocate memory at early boot up.
> 

Hmm, now I'm testing it more and it always seems to end up in the same
location. I'm not sure why it failed the first three times I tried it :-/

-- Steve