linux-kernel - [RFC PATCH 12/19] x86/resctrl: Add data structures and definitions for PLZA configuration

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: <d09bd17c80b6ab72202bf31a503b6a2fa0d9344d.1769029977.git.babu.moger@amd.com>
Date: Wed, 21 Jan 2026 15:12:50 -0600
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <tony.luck@...el.com>, <reinette.chatre@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <babu.moger@....com>,
	<tglx@...nel.org>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <peterz@...radead.org>,
	<juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
	<dietmar.eggemann@....com>, <rostedt@...dmis.org>, <bsegall@...gle.com>,
	<mgorman@...e.de>, <vschneid@...hat.com>, <akpm@...ux-foundation.org>,
	<pawan.kumar.gupta@...ux.intel.com>, <pmladek@...e.com>,
	<feng.tang@...ux.alibaba.com>, <kees@...nel.org>, <arnd@...db.de>,
	<fvdl@...gle.com>, <lirongqing@...du.com>, <bhelgaas@...gle.com>,
	<seanjc@...gle.com>, <xin@...or.com>, <manali.shukla@....com>,
	<dapeng1.mi@...ux.intel.com>, <chang.seok.bae@...el.com>,
	<mario.limonciello@....com>, <naveen@...nel.org>,
	<elena.reshetova@...el.com>, <thomas.lendacky@....com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kvm@...r.kernel.org>, <peternewman@...gle.com>, <eranian@...gle.com>,
	<gautham.shenoy@....com>
Subject: [RFC PATCH 12/19] x86/resctrl: Add data structures and definitions for PLZA configuration

Privilege Level Zero Association (PLZA) is configured with a Per Logical
Processor MSR: MSR_IA32_PQR_PLZA_ASSOC (0xc00003fc).

Add the necessary data structures and definitions to support PLZA
configuration.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/include/asm/msr-index.h       |  7 +++++++
 arch/x86/kernel/cpu/resctrl/internal.h | 26 ++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 0ef1f6a8f4bc..d42d31beaf3a 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1271,12 +1271,19 @@
 /* - AMD: */
 #define MSR_IA32_MBA_BW_BASE		0xc0000200
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280
+#define MSR_IA32_PQR_PLZA_ASSOC		0xc00003fc
 #define MSR_IA32_L3_QOS_ABMC_CFG	0xc00003fd
 #define MSR_IA32_L3_QOS_EXT_CFG		0xc00003ff
 #define MSR_IA32_EVT_CFG_BASE		0xc0000400
 #define MSR_IA32_GMBA_BW_BASE		0xc0000600
 #define MSR_IA32_GSMBA_BW_BASE		0xc0000680
 
+/* Lower 32 bits of MSR_IA32_PQR_PLZA_ASSOC */
+#define RMID_EN				BIT(31)
+/* Uppper 32 bits of  MSR_IA32_PQR_PLZA_ASSOC */
+#define CLOSID_EN			BIT(15)
+#define PLZA_EN				BIT(31)
+
 /* AMD-V MSRs */
 #define MSR_VM_CR                       0xc0010114
 #define MSR_VM_IGNNE                    0xc0010115
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 61a283652d39..4ea1ba659a01 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -219,6 +219,32 @@ union l3_qos_abmc_cfg {
 	unsigned long full;
 };
 
+/*
+ * PLZA can be configured on a CPU by writing to MSR_IA32_PQR_PLZA_ASSOC.
+ *
+ * @rmid		: The RMID to be configured for PLZA.
+ * @reserved1		: Reserved.
+ * @rmidid_en		: Asociate RMID or not.
+ * @closid		: The CLOSID to be configured for PLZA.
+ * @reserved2		: Reserved.
+ * @closid_en		: Asociate CLOSID or not.
+ * @reserved3		: Reserved.
+ * @plza_en		: configure PLZA or not
+ */
+union qos_pqr_plza_assoc {
+	struct {
+		unsigned long rmid	:12,
+			      reserved1	:19,
+			      rmid_en	: 1,
+			      closid	: 4,
+			      reserved2	:11,
+			      closid_en	: 1,
+			      reserved3	:15,
+			      plza_en	: 1;
+	} split;
+	unsigned long full;
+};
+
 void rdt_ctrl_update(void *arg);
 
 int rdt_get_l3_mon_config(struct rdt_resource *r);
-- 
2.34.1