From: Drew Fustini <fustini@kernel.org>
To: Reinette Chatre <reinette.chatre@intel.com>
Cc: "Luck, Tony" <tony.luck@intel.com>,
Babu Moger <babu.moger@amd.com>,
James Morse <james.morse@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
Ben Horgan <ben.horgan@arm.com>,
corbet@lwn.net, tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
vschneid@redhat.com, akpm@linux-foundation.org,
pawan.kumar.gupta@linux.intel.com, pmladek@suse.com,
feng.tang@linux.alibaba.com, kees@kernel.org, arnd@arndb.de,
fvdl@google.com, lirongqing@baidu.com, bhelgaas@google.com,
seanjc@google.com, xin@zytor.com, manali.shukla@amd.com,
dapeng1.mi@linux.intel.com, chang.seok.bae@intel.com,
mario.limonciello@amd.com, naveen@kernel.org,
elena.reshetova@intel.com, thomas.lendacky@amd.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, peternewman@google.com, eranian@google.com,
gautham.shenoy@amd.com
Subject: Re: [RFC PATCH 00/19] x86,fs/resctrl: Support for Global Bandwidth Enforcement and Priviledge Level Zero Association
Date: Tue, 10 Feb 2026 16:40:23 -0800 [thread overview]
Message-ID: <aYvP98xGoKPrDBCE@gen8> (raw)
In-Reply-To: <d2ccabb1-e1de-4767-a7b0-9d72982e52af@intel.com>
On Mon, Feb 09, 2026 at 04:27:47PM -0800, Reinette Chatre wrote:
> Adding Ben
>
> On 2/3/26 11:58 AM, Luck, Tony wrote:
> > On Wed, Jan 21, 2026 at 03:12:38PM -0600, Babu Moger wrote:
> >> Privilege Level Zero Association (PLZA)
> >>
> >> Privilege Level Zero Association (PLZA) allows the hardware to
> >> automatically associate execution in Privilege Level Zero (CPL=0) with a
> >> specific COS (Class of Service) and/or RMID (Resource Monitoring
> >> Identifier). The QoS feature set already has a mechanism to associate
> >> execution on each logical processor with an RMID or COS. PLZA allows the
> >> system to override this per-thread association for a thread that is
> >> executing with CPL=0.
> >
> > Adding Drew, and prodding Dave & James, for this discussion.
> >
> > At LPC it was stated that both ARM and RISC-V already have support
> > to run kernel code with different quality of service parameters from
> > user code.
Sorry, for RISC-V, I should clarify that there is no hardware feature
that changes the QoS identifier value when switching between kernel mode
and user mode. This could be done in the kernel task switching code, but
there is no implicit hardware operation.
Thanks,
Drew
prev parent reply other threads:[~2026-02-11 0:40 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-21 21:12 [RFC PATCH 00/19] x86,fs/resctrl: Support for Global Bandwidth Enforcement and Priviledge Level Zero Association Babu Moger
2026-01-21 21:12 ` [RFC PATCH 01/19] x86,fs/resctrl: Add support for Global Bandwidth Enforcement (GLBE) Babu Moger
2026-02-09 18:44 ` Reinette Chatre
2026-02-11 1:07 ` Moger, Babu
2026-02-11 16:54 ` Reinette Chatre
2026-02-11 21:18 ` Babu Moger
2026-02-12 3:51 ` Reinette Chatre
2026-02-12 19:09 ` Babu Moger
2026-02-13 0:05 ` Reinette Chatre
2026-02-13 1:51 ` Moger, Babu
2026-02-13 16:17 ` Reinette Chatre
2026-02-13 23:14 ` Moger, Babu
2026-02-14 0:01 ` Reinette Chatre
2026-02-16 16:05 ` Babu Moger
2026-02-20 10:07 ` Ben Horgan
2026-02-20 18:39 ` Reinette Chatre
2026-02-23 9:29 ` Ben Horgan
2026-02-21 0:12 ` Moger, Babu
2026-02-23 13:21 ` Fenghua Yu
2026-02-23 17:38 ` Reinette Chatre
2026-02-23 13:21 ` Fenghua Yu
2026-01-21 21:12 ` [RFC PATCH 02/19] x86,fs/resctrl: Add the resource for Global Memory Bandwidth Allocation Babu Moger
2026-01-21 21:12 ` [RFC PATCH 03/19] fs/resctrl: Add new interface max_bandwidth Babu Moger
2026-02-06 23:58 ` Reinette Chatre
2026-02-09 23:52 ` Moger, Babu
2026-01-21 21:12 ` [RFC PATCH 04/19] fs/resctrl: Add the documentation for Global Memory Bandwidth Allocation Babu Moger
2026-02-03 0:00 ` Luck, Tony
2026-02-03 16:38 ` Babu Moger
2026-02-09 16:32 ` Reinette Chatre
2026-02-10 19:44 ` Babu Moger
2026-01-21 21:12 ` [RFC PATCH 05/19] x86,fs/resctrl: Add support for Global Slow Memory Bandwidth Allocation (GSMBA) Babu Moger
2026-01-21 21:12 ` [RFC PATCH 06/19] x86,fs/resctrl: Add the resource for Global Slow Memory Bandwidth Enforcement(GLSBE) Babu Moger
2026-01-21 21:12 ` [RFC PATCH 07/19] fs/resctrl: Add the documentation for Global Slow Memory Bandwidth Allocation Babu Moger
2026-01-21 21:12 ` [RFC PATCH 08/19] x86/resctrl: Support Privilege-Level Zero Association (PLZA) Babu Moger
2026-01-21 21:12 ` [RFC PATCH 09/19] x86/resctrl: Add plza_capable in rdt_resource data structure Babu Moger
2026-02-11 15:19 ` Ben Horgan
2026-02-11 16:54 ` Reinette Chatre
2026-02-11 17:48 ` Ben Horgan
2026-02-13 15:50 ` Moger, Babu
2026-01-21 21:12 ` [RFC PATCH 10/19] fs/resctrl: Expose plza_capable via control info file Babu Moger
2026-01-21 21:12 ` [RFC PATCH 11/19] resctrl: Introduce PLZA static key enable/disable helpers Babu Moger
2026-01-21 21:12 ` [RFC PATCH 12/19] x86/resctrl: Add data structures and definitions for PLZA configuration Babu Moger
2026-01-21 21:12 ` [RFC PATCH 13/19] x86/resctrl: Add PLZA state tracking and context switch handling Babu Moger
2026-01-27 22:30 ` Luck, Tony
2026-01-28 16:01 ` Moger, Babu
2026-01-28 17:12 ` Luck, Tony
2026-01-28 17:41 ` Moger, Babu
2026-01-28 17:44 ` Moger, Babu
2026-01-28 19:17 ` Luck, Tony
2026-02-10 16:17 ` Reinette Chatre
2026-02-10 18:04 ` Reinette Chatre
2026-02-11 16:40 ` Ben Horgan
2026-02-11 19:46 ` Luck, Tony
2026-02-11 22:22 ` Reinette Chatre
2026-02-12 13:55 ` Ben Horgan
2026-02-12 18:37 ` Reinette Chatre
2026-02-16 15:18 ` Ben Horgan
2026-02-17 18:51 ` Reinette Chatre
2026-02-17 21:44 ` Luck, Tony
2026-02-17 22:37 ` Reinette Chatre
2026-02-17 22:52 ` Luck, Tony
2026-02-17 23:55 ` Reinette Chatre
2026-02-18 16:44 ` Luck, Tony
2026-02-19 17:03 ` Luck, Tony
2026-02-19 17:45 ` Ben Horgan
2026-02-20 8:21 ` Drew Fustini
2026-02-19 17:33 ` Ben Horgan
2026-02-20 2:53 ` Reinette Chatre
2026-02-20 22:44 ` Moger, Babu
2026-02-23 17:12 ` Reinette Chatre
2026-02-23 22:35 ` Moger, Babu
2026-02-23 23:13 ` Reinette Chatre
2026-02-24 19:37 ` Babu Moger
2026-02-23 10:08 ` Ben Horgan
2026-02-23 16:38 ` Reinette Chatre
2026-02-24 9:36 ` Ben Horgan
2026-02-24 16:13 ` Reinette Chatre
2026-02-19 11:06 ` Ben Horgan
2026-02-19 18:12 ` Luck, Tony
2026-02-19 18:36 ` Reinette Chatre
2026-02-19 10:21 ` Ben Horgan
2026-02-19 18:14 ` Reinette Chatre
2026-02-23 9:48 ` Ben Horgan
2026-02-13 16:37 ` Moger, Babu
2026-02-13 17:02 ` Luck, Tony
2026-02-16 19:24 ` Babu Moger
2026-02-14 0:10 ` Reinette Chatre
2026-02-16 15:41 ` Ben Horgan
2026-02-16 22:52 ` Moger, Babu
2026-02-17 15:56 ` Ben Horgan
2026-02-17 16:38 ` Babu Moger
2026-02-18 9:54 ` Ben Horgan
2026-02-18 6:22 ` Stephane Eranian
2026-02-18 9:35 ` Ben Horgan
2026-02-19 10:27 ` Ben Horgan
2026-02-16 22:36 ` Moger, Babu
2026-02-12 10:00 ` Ben Horgan
2026-01-21 21:12 ` [RFC PATCH 14/19] x86,fs/resctrl: Add the functionality to configure PLZA Babu Moger
2026-01-29 19:13 ` Luck, Tony
2026-01-29 19:53 ` Babu Moger
2026-01-21 21:12 ` [RFC PATCH 15/19] fs/resctrl: Introduce PLZA attribute in rdtgroup interface Babu Moger
2026-01-21 21:12 ` [RFC PATCH 16/19] fs/resctrl: Implement rdtgroup_plza_write() to configure PLZA in a group Babu Moger
2026-01-28 22:03 ` Luck, Tony
2026-01-29 18:54 ` Luck, Tony
2026-01-29 19:31 ` Babu Moger
2026-01-29 19:42 ` Babu Moger
2026-02-10 0:05 ` Reinette Chatre
2026-02-11 23:10 ` Moger, Babu
2026-01-21 21:12 ` [RFC PATCH 17/19] fs/resctrl: Update PLZA configuration when cpu_mask changes Babu Moger
2026-01-21 21:12 ` [RFC PATCH 18/19] x86/resctrl: Refactor show_rdt_tasks() to support PLZA task matching Babu Moger
2026-01-21 21:12 ` [RFC PATCH 19/19] fs/resctrl: Add per-task PLZA enable support via rdtgroup Babu Moger
2026-02-03 19:58 ` [RFC PATCH 00/19] x86,fs/resctrl: Support for Global Bandwidth Enforcement and Priviledge Level Zero Association Luck, Tony
2026-02-10 0:27 ` Reinette Chatre
2026-02-11 0:40 ` Drew Fustini [this message]
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