linux-kernel - [RFC PATCH 2/9] x86/mm: Introduce Remote Action Request MSRs

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Message-ID: <20250506003811.92405-3-riel@surriel.com>
Date: Mon,  5 May 2025 20:37:40 -0400
From: Rik van Riel <riel@...riel.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	x86@...nel.org,
	kernel-team@...a.com,
	dave.hansen@...ux.intel.com,
	luto@...nel.org,
	peterz@...radead.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	hpa@...or.com,
	Yu-cheng Yu <yu-cheng.yu@...el.com>,
	Rik van Riel <riel@...riel.com>
Subject: [RFC PATCH 2/9] x86/mm: Introduce Remote Action Request MSRs

From: Yu-cheng Yu <yu-cheng.yu@...el.com>

Remote Action Request (RAR) is a TLB flushing broadcast facility.
This patch introduces RAR MSRs.  RAR is introduced in later patches.

There are five RAR MSRs:

  MSR_CORE_CAPABILITIES
  MSR_IA32_RAR_CTRL
  MSR_IA32_RAR_ACT_VEC
  MSR_IA32_RAR_PAYLOAD_BASE
  MSR_IA32_RAR_INFO

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Signed-off-by: Rik van Riel <riel@...riel.com>
---
 arch/x86/include/asm/msr-index.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 0828b891fe2e..923e17462712 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -122,6 +122,17 @@
 #define SNB_C3_AUTO_UNDEMOTE		(1UL << 27)
 #define SNB_C1_AUTO_UNDEMOTE		(1UL << 28)
 
+/*
+ * Remote Action Requests (RAR) MSRs
+ */
+#define MSR_IA32_RAR_CTRL		0x000000ed
+#define MSR_IA32_RAR_ACT_VEC		0x000000ee
+#define MSR_IA32_RAR_PAYLOAD_BASE	0x000000ef
+#define MSR_IA32_RAR_INFO		0x000000f0
+
+#define RAR_CTRL_ENABLE			BIT(31)
+#define RAR_CTRL_IGNORE_IF		BIT(30)
+
 #define MSR_MTRRcap			0x000000fe
 
 #define MSR_IA32_ARCH_CAPABILITIES	0x0000010a
-- 
2.49.0