linux-kernel - Re: [PATCH 08/29] x86/boot/e820: Print E820_TYPE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aAc3wxUI2Jvqj2xx@surfacebook.localdomain>
Date: Tue, 22 Apr 2025 09:31:31 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
	Arnd Bergmann <arnd@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Juergen Gross <jgross@...e.com>, "H . Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Rapoport <rppt@...nel.org>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [PATCH 08/29] x86/boot/e820: Print E820_TYPE_RAM entries as ...
 RAM entries

Mon, Apr 21, 2025 at 08:51:48PM +0200, Ingo Molnar kirjoitti:
> So it is a bit weird that the actual RAM entries of the E820 table
> are not actually called RAM, but 'usable':
> 
> 	BIOS-e820: [mem 0x0000000000100000-0x000000007ffdbfff]    1.9 GB usable
> 
> 'usable' is pretty passive-aggressive in that context and ambiguous,
> most E820 entries denote 'usable' address ranges - reserved ranges
> may be used by devices, or the platform.
> 
> Clarify and disambiguate this by making the boot log entry
> explicitly say 'kernel usable RAM':
> 
> 	BIOS-e820: [mem 0x0000000000100000-0x000000007ffdbfff]    1.9 GB kernel usable RAM

Can't user space use that RAM?

Shouldn't we rather refer to "OS usable RAM"?


-- 
With Best Regards,
Andy Shevchenko