linux-kernel - Re: [PATCH v6 10/24] x86/resctrl: Allocate the cleanest CLOSID by searching closid_num_dirty

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]

Date:   Tue, 24 Oct 2023 14:06:35 +0200
From:   Maciej Wieczór-Retman 
        <maciej.wieczor-retman@...el.com>
To:     James Morse <james.morse@....com>
CC:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        "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>,
        <xingxin.hx@...nanolis.org>, <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>
Subject: Re: [PATCH v6 10/24] x86/resctrl: Allocate the cleanest CLOSID by
 searching closid_num_dirty_rmid

On 2023-09-14 at 17:21:24 +0000, James Morse wrote:
>MPAM's PMG bits extend its PARTID space, meaning the same PMG value can be
>used for different control groups.
>
>This means once a CLOSID is allocated, all its monitoring ids may still be
>dirty, and held in limbo.
>
>Instead of allocating the first free CLOSID, on architectures where
>CONFIG_RESCTRL_RMID_DEPENDS_ON_COSID is enabled, search

"CONFIG_RESCTRL_RMID_DEPENDS_ON_COSID" >
"CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID"?

>closid_num_dirty_rmid[] to find the cleanest CLOSID.
>
>The CLOSID found is returned to closid_alloc() for the free list
>to be updated.

-- 
Kind regards
Maciej Wieczór-Retman