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

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To: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: RE: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
From: "Luck, Tony" <tony.luck@xxxxxxxxx>
Date: Tue, 9 Apr 2024 23:52:27 +0000
Accept-language: en-US
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-trace-kernel@xxxxxxxxxxxxxxx" <linux-trace-kernel@xxxxxxxxxxxxxxx>, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxx>, "linux-hardening@xxxxxxxxxxxxxxx" <linux-hardening@xxxxxxxxxxxxxxx>, Guenter Roeck <linux@xxxxxxxxxxxx>, "Ross Zwisler" <zwisler@xxxxxxxxxx>, "wklin@xxxxxxxxxx" <wklin@xxxxxxxxxx>, Vineeth Remanan Pillai <vineeth@xxxxxxxxxxxxxxx>, Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>, Suleiman Souhlal <suleiman@xxxxxxxxxx>, "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>
In-reply-to: <202404091628.BEC1FAC8@keescook>
References: <20240409210254.660888920@goodmis.org> <20240409172358.34ea19f0@gandalf.local.home> <202404091519.B7B2221@keescook> <SJ1PR11MB608317E066B6B3390F55FCB1FC072@SJ1PR11MB6083.namprd11.prod.outlook.com> <202404091628.BEC1FAC8@keescook>

> 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

References:
- [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
  - From: Steven Rostedt
- Re: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
  - From: Steven Rostedt
- Re: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
  - From: Kees Cook
- RE: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
  - From: Luck, Tony
- Re: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently
  - From: Kees Cook

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