linux-kernel - Re: [PATCH v9 15/27] x86/resctrl: Move pseudo lock prototypes to include/linux/resctrl.h

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: <d590fa55-667a-4da8-a414-12e6f3ab06a2@intel.com>
Date: Thu, 1 May 2025 10:29:44 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: James Morse <james.morse@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>, Babu Moger
	<Babu.Moger@....com>, <shameerali.kolothum.thodi@...wei.com>, "D Scott
 Phillips OS" <scott@...amperecomputing.com>, <carl@...amperecomputing.com>,
	<lcherian@...vell.com>, <bobo.shaobowang@...wei.com>,
	<tan.shaopeng@...itsu.com>, <baolin.wang@...ux.alibaba.com>, Jamie Iles
	<quic_jiles@...cinc.com>, Xin Hao <xhao@...ux.alibaba.com>,
	<peternewman@...gle.com>, <dfustini@...libre.com>, <amitsinght@...vell.com>,
	David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>,
	"Dave Martin" <dave.martin@....com>, Koba Ko <kobak@...dia.com>, Shanker
 Donthineni <sdonthineni@...dia.com>, <fenghuay@...dia.com>
Subject: Re: [PATCH v9 15/27] x86/resctrl: Move pseudo lock prototypes to
 include/linux/resctrl.h

Hi James,

On 4/25/25 10:37 AM, James Morse wrote:
> The resctrl pseudo-lock feature allows an architecture to allocate data
> into particular cache portions, which are then treated as reserved to
> avoid that data ever being evicted. Setting this up is deeply architecture
> specific as it involves disabling prefetchers etc. It is not possible
> to support this kind of feature on arm64. Risc-V is assumed to be the
> same.
> 
> The prototypes for the architecture code were added to x86's asm/resctrl.h,
> with other architectures able to provide subs for their architecture. This

subs -> stubs?

> forces other architectures to provide identical stubs.
> 
> Move the prototypes and stubs to linux/resctrl.h, and switch between them
> using the existing Kconfig symbol.
> 
> Signed-off-by: James Morse <james.morse@....com>
> ---

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette