From: Babu Moger <babu.moger@amd.com>
To: Reinette Chatre <reinette.chatre@intel.com>,
corbet@lwn.net, tony.luck@intel.com, Dave.Martin@arm.com,
james.morse@arm.com, tglx@kernel.org, bp@alien8.de,
ben.horgan@arm.com, fenghuay@nvidia.com
Cc: skhan@linuxfoundation.org, x86@kernel.org, mingo@redhat.com,
dave.hansen@linux.intel.com, hpa@zytor.com,
akpm@linux-foundation.org, rdunlap@infradead.org,
peterz@infradead.org, feng.tang@linux.alibaba.com,
dapeng1.mi@linux.intel.com, elver@google.com,
enelsonmoore@gmail.com, kuba@kernel.org, ebiggers@kernel.org,
lirongqing@baidu.com, seanjc@google.com, nikunj@amd.com,
xin@zytor.com, pawan.kumar.gupta@linux.intel.com,
tiala@microsoft.com, chang.seok.bae@intel.com,
kprateek.nayak@amd.com, prathyushi.nangia@amd.com,
kim.phillips@amd.com, naveen@kernel.org, darwi@linutronix.de,
elena.reshetova@intel.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, thomas.lendacky@amd.com,
eranian@google.com, peternewman@google.com,
qinyuntan@linux.alibaba.com
Subject: Re: [RESEND PATCH v4 02/15] x86/resctrl: Add PLZA support to command-line options
Date: Tue, 11 Aug 2026 15:03:20 -0500 [thread overview]
Message-ID: <21503e4f-710a-429b-b6e4-957141d31fa1@amd.com> (raw)
In-Reply-To: <d828905f-2194-4447-a1c2-7b604407bafb@intel.com>
Hi Reinette,
On 8/10/26 21:53, Reinette Chatre wrote:
> Hi Babu,
>
> On 7/7/26 2:50 PM, Babu Moger wrote:
>> Add a kernel command-line parameter to enable or disable the exposure of
>> the PLZA (Privilege Level Zero Association) feature to resctrl.
>>
>> This allows administrators to control PLZA visibility at boot time via the
>> rdt= option (e.g. rdt=plza or rdt=!plza).
>
> nit: Since this provides examples of the only two supported usages it may be helpful
> to make clear when these options are required since users should not need to always
> boot with rdt=plza to use this feature.
>
Will add text:
On systems that support PLZA, resctrl exposes kernel-mode PLZA control
by default without requiring any explicit rdt= option. The rdt=!plza
parameter can be used to disable PLZA exposure to resctrl, while
rdt=plza explicitly enables it.
Thanks
Babu
next prev parent reply other threads:[~2026-08-11 20:03 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-07 21:50 [RESEND PATCH v4 00/15] x86/resctrl: Add kernel-mode (e.g., PLZA) support to the resctrl subsystem Babu Moger
2026-07-07 21:50 ` [RESEND PATCH v4 01/15] x86/resctrl: Support Privilege Level Zero Association (PLZA) Babu Moger
2026-07-07 22:01 ` Borislav Petkov
2026-07-08 14:51 ` Babu Moger
2026-07-08 17:27 ` Borislav Petkov
2026-07-08 16:55 ` Babu Moger
2026-07-08 23:28 ` Borislav Petkov
2026-07-09 0:00 ` Namhyung Kim
2026-07-09 0:12 ` Borislav Petkov
2026-07-10 0:55 ` Namhyung Kim
2026-07-10 1:46 ` Borislav Petkov
2026-08-11 2:51 ` Reinette Chatre
2026-08-11 20:02 ` Babu Moger
2026-07-07 21:50 ` [RESEND PATCH v4 02/15] x86/resctrl: Add PLZA support to command-line options Babu Moger
2026-07-08 17:39 ` Babu Moger
2026-08-11 2:53 ` Reinette Chatre
2026-08-11 20:03 ` Babu Moger [this message]
2026-07-07 21:50 ` [RESEND PATCH v4 03/15] x86/resctrl: Add data structures and definitions for PLZA configuration Babu Moger
2026-07-08 20:20 ` Babu Moger
2026-08-11 2:58 ` Reinette Chatre
2026-08-11 21:10 ` Babu Moger
2026-08-11 23:51 ` Reinette Chatre
2026-08-12 14:18 ` Moger, Babu
2026-07-07 21:50 ` [RESEND PATCH v4 04/15] fs/resctrl: Introduce kernel mode (kmode) data structures Babu Moger
2026-07-08 20:56 ` Babu Moger
2026-08-11 3:03 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 05/15] x86,fs/resctrl: Introduce architecture hooks to program kernel-mode Babu Moger
2026-07-08 23:04 ` Moger, Babu
2026-08-11 3:14 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 06/15] fs/resctrl: Introduce resctrl_set_kmode_support() to initialize supported modes Babu Moger
2026-08-11 3:16 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 07/15] x86/resctrl: Expose the supported PLZA kernel-mode policies during init Babu Moger
2026-07-09 15:15 ` Babu Moger
2026-07-07 21:50 ` [RESEND PATCH v4 08/15] fs/resctrl: Add interface to display supported and active kernel-mode policy Babu Moger
2026-08-11 3:18 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 09/15] fs/resctrl: Introduce kmode_cpus/kmode_cpus_list per rdtgroup Babu Moger
2026-08-11 3:20 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 10/15] fs/resctrl: Reset the kernel-mode binding when an rdtgroup is removed Babu Moger
2026-07-09 18:15 ` Babu Moger
2026-08-11 3:29 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 11/15] fs/resctrl: Program kernel-mode binding when CPU comes online Babu Moger
2026-07-09 20:01 ` Babu Moger
2026-07-07 21:50 ` [RESEND PATCH v4 12/15] fs/resctrl: Hide kmode_cpus[_list] on groups not bound to kernel-mode Babu Moger
2026-08-11 3:30 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 13/15] fs/resctrl: Add interface to modify kernel-mode via info/kernel_mode Babu Moger
2026-07-09 22:46 ` Moger, Babu
2026-08-11 3:40 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 14/15] fs/resctrl: Allow user space to write kmode_cpus/kmode_cpus_list Babu Moger
2026-07-09 23:14 ` Moger, Babu
2026-08-11 3:49 ` Reinette Chatre
2026-07-07 21:50 ` [RESEND PATCH v4 15/15] fs/resctrl: Add documentation on kernel_mode with example Babu Moger
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