From: Rik van Riel <riel@surriel.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, x86@kernel.org, kernel-team@meta.com,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, hpa@zytor.com, nadav.amit@gmail.com,
Yu-cheng Yu <yu-cheng.yu@intel.com>,
Rik van Riel <riel@surriel.com>
Subject: [RFC v2 2/9] x86/mm: Introduce Remote Action Request MSRs
Date: Mon, 19 May 2025 21:02:27 -0400 [thread overview]
Message-ID: <20250520010350.1740223-3-riel@surriel.com> (raw)
In-Reply-To: <20250520010350.1740223-1-riel@surriel.com>
From: Yu-cheng Yu <yu-cheng.yu@intel.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@intel.com>
Signed-off-by: Rik van Riel <riel@surriel.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 c848dd4bfceb..adff8f0dc7bb 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
next prev parent reply other threads:[~2025-05-20 1:04 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-20 1:02 [RFC v2 PATCH 0/9] Intel RAR TLB invalidation Rik van Riel
2025-05-20 1:02 ` [RFC v2 1/9] x86/mm: Introduce MSR_IA32_CORE_CAPABILITIES Rik van Riel
2025-05-21 14:57 ` Dave Hansen
2025-05-22 15:10 ` Sean Christopherson
2025-05-20 1:02 ` Rik van Riel [this message]
2025-05-21 11:49 ` [RFC v2 2/9] x86/mm: Introduce Remote Action Request MSRs Borislav Petkov
2025-05-20 1:02 ` [RFC v2 3/9] x86/mm: enable BROADCAST_TLB_FLUSH on Intel, too Rik van Riel
2025-05-20 1:02 ` [RFC v2 4/9] x86/mm: Introduce X86_FEATURE_RAR Rik van Riel
2025-05-21 11:53 ` Borislav Petkov
2025-05-21 13:57 ` Rik van Riel
2025-05-21 14:53 ` Borislav Petkov
2025-05-21 16:06 ` Rik van Riel
2025-05-21 19:39 ` Borislav Petkov
2025-05-20 1:02 ` [RFC v2 5/9] x86/mm: Change cpa_flush() to call flush_kernel_range() directly Rik van Riel
2025-05-21 11:54 ` Borislav Petkov
2025-05-21 15:16 ` Dave Hansen
2025-05-20 1:02 ` [RFC v2 6/9] x86/apic: Introduce Remote Action Request Operations Rik van Riel
2025-05-20 9:16 ` Ingo Molnar
2025-06-04 0:11 ` Rik van Riel
2025-05-21 15:28 ` Dave Hansen
2025-05-21 15:59 ` Rik van Riel
2025-05-20 1:02 ` [RFC v2 7/9] x86/mm: Introduce Remote Action Request Rik van Riel
2025-05-20 9:28 ` Ingo Molnar
2025-05-20 12:57 ` Rik van Riel
2025-05-24 9:22 ` Ingo Molnar
2025-05-20 11:29 ` Nadav Amit
2025-05-20 13:00 ` Rik van Riel
2025-05-20 20:26 ` Nadav Amit
2025-05-20 20:31 ` Rik van Riel
2025-05-21 16:38 ` Dave Hansen
2025-05-21 19:06 ` Thomas Gleixner
2025-06-03 20:08 ` Rik van Riel
2025-05-20 1:02 ` [RFC v2 8/9] x86/mm: use RAR for kernel TLB flushes Rik van Riel
2025-05-20 1:02 ` [RFC v2 9/9] x86/mm: userspace & pageout flushing using Intel RAR Rik van Riel
2025-05-20 2:48 ` [RFC v2.1 " Rik van Riel
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