From nobody Tue Dec 16 07:08:14 2025 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8E34B1D5ADE for ; Tue, 20 May 2025 01:04:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.67.55.147 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747703058; cv=none; b=H5WBibpDPpCXoFW+etIL5WntJUmOjHcDbt52A51XN3xKpcrSi2VVGmn5JW9gXs4kbOA5Z8LKj6LbkTqDiVjxlbwjSJhnUKpGis1EuJrICNFFAXmsDw8rHsjnyBOjRQjlaXo99wapSPIvlqzN4BYDBUHh5Vt87nyc+qCsADzTAes= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747703058; c=relaxed/simple; bh=GYOrWHOgXKndKAS+zujXkprS9J2OU3xFf/JcbdsGsUA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qikK9UWqQdYuLMlYPzLEw5G0NNsP3s5SMnq7DY2YCHZY8OJAmRSOCeTQfE3SirQGKnRm1ztL4bQy6KfBIUTLfuGaPuZ9MQpQ9q9wKrSv5rjK3JFP5brlDyHkbltjuZSBsCx/xKHyrCKCcXEV0dpUNfW0WM288omKn3Bn8NFNuZo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com; spf=pass smtp.mailfrom=shelob.surriel.com; arc=none smtp.client-ip=96.67.55.147 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=shelob.surriel.com Received: from fangorn.home.surriel.com ([10.0.13.7]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.97.1) (envelope-from ) id 1uHBOc-000000000aB-42pv; Mon, 19 May 2025 21:03:54 -0400 From: Rik van Riel 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 , Rik van Riel Subject: [RFC v2 2/9] x86/mm: Introduce Remote Action Request MSRs Date: Mon, 19 May 2025 21:02:27 -0400 Message-ID: <20250520010350.1740223-3-riel@surriel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250520010350.1740223-1-riel@surriel.com> References: <20250520010350.1740223-1-riel@surriel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: riel@surriel.com Content-Type: text/plain; charset="utf-8" From: Yu-cheng Yu 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 Signed-off-by: Rik van Riel --- 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-in= dex.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) =20 +/* + * 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 =20 #define MSR_IA32_ARCH_CAPABILITIES 0x0000010a --=20 2.49.0