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, Yu-cheng Yu <yu-cheng.yu@intel.com>,
Rik van Riel <riel@surriel.com>
Subject: [RFC PATCH 1/9] x86/mm: Introduce MSR_IA32_CORE_CAPABILITIES
Date: Mon, 5 May 2025 20:37:39 -0400 [thread overview]
Message-ID: <20250506003811.92405-2-riel@surriel.com> (raw)
In-Reply-To: <20250506003811.92405-1-riel@surriel.com>
From: Yu-cheng Yu <yu-cheng.yu@intel.com>
MSR_IA32_CORE_CAPABILITIES indicates the existence of other MSRs.
Bit[1] indicates Remote Action Request (RAR) TLB registers.
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 | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index ac21dc19dde2..0828b891fe2e 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -212,6 +212,12 @@
* File.
*/
+#define MSR_IA32_CORE_CAPABILITIES 0x000000cf
+#define CORE_CAP_RAR BIT(1) /*
+ * Remote Action Request. Used to directly
+ * flush the TLB on remote CPUs.
+ */
+
#define MSR_IA32_FLUSH_CMD 0x0000010b
#define L1D_FLUSH BIT(0) /*
* Writeback and invalidate the
--
2.49.0
next prev parent reply other threads:[~2025-05-06 0:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-06 0:37 [RFC PATCH 0/9] Intel RAR TLB invalidation Rik van Riel
2025-05-06 0:37 ` Rik van Riel [this message]
2025-05-06 0:37 ` [RFC PATCH 2/9] x86/mm: Introduce Remote Action Request MSRs Rik van Riel
2025-05-06 0:37 ` [RFC PATCH 3/9] x86/mm: enable BROADCAST_TLB_FLUSH on Intel, too Rik van Riel
2025-05-06 0:37 ` [RFC PATCH 4/9] x86/mm: Introduce X86_FEATURE_RAR Rik van Riel
2025-05-06 0:37 ` [RFC PATCH 5/9] x86/mm: Change cpa_flush() to call flush_kernel_range() directly Rik van Riel
2025-05-06 0:37 ` [RFC PATCH 6/9] x86/apic: Introduce Remote Action Request Operations Rik van Riel
2025-05-06 0:37 ` [RFC PATCH 7/9] x86/mm: Introduce Remote Action Request Rik van Riel
2025-05-06 6:59 ` Nadav Amit
2025-05-06 15:16 ` Rik van Riel
2025-05-06 15:27 ` Dave Hansen
2025-05-06 15:50 ` Nadav Amit
2025-05-06 16:00 ` Rik van Riel
2025-05-06 16:31 ` Ingo Molnar
2025-05-06 0:37 ` [RFC PATCH 8/9] x86/mm: use RAR for kernel TLB flushes Rik van Riel
2025-05-06 0:37 ` [RFC PATCH 9/9] x86/mm: userspace & pageout flushing using Intel RAR Rik van Riel
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