linux-hardening - RE: [PATCH 1/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up

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Message-ID: <SJ1PR11MB60836B1DBD5C41BF22A66430FCF82@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Tue, 4 Jun 2024 16:05:04 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>, Ard Biesheuvel <ardb@...nel.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>, Kees Cook <keescook@...omium.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>, Mike Rapoport
	<rppt@...nel.org>
Subject: RE: [PATCH 1/2] mm/memblock: Add "reserve_mem" to reserved named
 memory at boot up

> I have been using this on two different test machines, as well as a
> chromebook, and it appears to work on all ofthem. As well as for VMs. I
> plan on adding this to my workstation and server too (they use EFI).

I think that BIOS on Intel servers with ECC memory will stomp on all
memory (to ensure that ECC bits are all set to good values). There
might be a "fast boot" BIOS option to skip this (but using it leaves you
vulnerable after a crash due to ECC fail to hit the same error again).

-Tony