From nobody Sun Feb 8 16:05:18 2026 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2066.outbound.protection.outlook.com [40.107.94.66]) (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 F2FE118C93F for ; Tue, 30 Jul 2024 19:40:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.94.66 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722368439; cv=fail; b=rgIbXMUUHBmhLCAErGqCrPzhqQvz2VOiDleWp1caOhBZvAWyCtgDUIodfT/aSNz3VloXy2o807pI2JVUluj0BTogrZpTbFaGZw/sCKw0qHPU4wgdQKBxwteBWKxcRjrgW/CfgRdplCUHdoqA8R0H5ima0fXohvHNKfjagon7clY= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722368439; c=relaxed/simple; bh=T+AuwQVlO4kVy2UTybr9Ssl+QOUDs4z7w0Yl9022B30=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=SoZckVaIWYIr5bX0tLbngodtbHtk0CB4BB5/LaQY9GPqRkjeAlJpHqAiIFJ/9ap92xloDQbQQo1WbT43pirrPSKxfrBwKs2/OgvZE9rynhfJcOOJjXpMZlmQipZB6iN6QJETnGT0jPmySs0w4gGBZoYbye0pHdSafGg7zKcMxFk= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=m3ZP6rz/; arc=fail smtp.client-ip=40.107.94.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="m3ZP6rz/" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=jvA89MEtHemkwARsKEeEexMl6kgVh4exJj2xCdI4u2ngcSpD2RxCijtf4xVaK5jDXUmfdjZ7yDV3F3tQ2YVzwGP0wY6KCTSqKVGR6LrItJ+Mrm5tpH0QVm5kLjOr6k8hk3d1+NKNDlUMu/EI3/2Fcoh8TDt9cWEbCES5yeqSmIw4XNLPcsR37kSEE/ThmW53SY4riE33Rb6iPUDCNTNcrLcdSYKNuOo7rOtF7WuiE8D4wgaBzi9Us49NSPMR1K+/rjTvoR2ZmTkR8vjNDCCvXCbvXrpc2SEiuupkljFPp4zicWPA/KBAhgzUVGOL4gBef0oiMB/DrottxINjiPyPAg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=nNzdsdorqmzdI1TX0wknVPixlglwQ7l2/ZAdfw+j/XY=; b=ukeQRfbxKypaEeVCcijEq22QmTiKfVfMdoMYSXVHJ4jk3Y3wlweurmJsfwWbFH4PcHKi844B54LGzKvt0tYGsSqo35DJGmdKfGxeakE9DDtgcOOddM8uFgORUGWYUuqK46Rbto5m+zOT9RNX+fHSM2dMtxurLciFiRyZoMrNkQQuqWBZdnV1C9bQtUy0ii8I66Bi8ACCivISRgPFtPlpDTeGL1qdwDJ3ZJl1Tmdkwidx+KSnFlxp8D8DQwKgI2HC2ixBvymI5n6GHLl4RGHEvMZMXcqcaZKbxmpVPvSxxFndsaAKp8zgmLIeWMh7vwbpFyDei4lmklyhdxgXycTX4A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=nNzdsdorqmzdI1TX0wknVPixlglwQ7l2/ZAdfw+j/XY=; b=m3ZP6rz/obpyfrdzb1+F7H6uongHWBS+ejsfenVwixTCo/u/Or04A1hOTjqvNe2/ILo0FZMqst0SSAEIGrqnSmq1ZMW1PWyPPUDFiroLrKu/6dzMlgqlyNlECTVVdCT1N4SPlfYk9q3ashhD+c258JgKW89j/KeLniyVV0S9mxw= Received: from MW4PR04CA0351.namprd04.prod.outlook.com (2603:10b6:303:8a::26) by CY8PR12MB7707.namprd12.prod.outlook.com (2603:10b6:930:86::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7807.27; Tue, 30 Jul 2024 19:40:35 +0000 Received: from MWH0EPF000A6733.namprd04.prod.outlook.com (2603:10b6:303:8a:cafe::6f) by MW4PR04CA0351.outlook.office365.com (2603:10b6:303:8a::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7828.21 via Frontend Transport; Tue, 30 Jul 2024 19:40:35 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by MWH0EPF000A6733.mail.protection.outlook.com (10.167.249.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7828.19 via Frontend Transport; Tue, 30 Jul 2024 19:40:35 +0000 Received: from tlendack-t1.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 30 Jul 2024 14:40:32 -0500 From: Tom Lendacky To: , CC: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Michael Roth , Ashish Kalra Subject: [PATCH v2 2/7] x86/sev: Add support for the RMPREAD instruction Date: Tue, 30 Jul 2024 14:40:02 -0500 Message-ID: <97c2a5756294188cf4b32cd87046fdc7116eb5b7.1722368407.git.thomas.lendacky@amd.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: References: 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 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000A6733:EE_|CY8PR12MB7707:EE_ X-MS-Office365-Filtering-Correlation-Id: cc339a2b-c3ab-47c5-656f-08dcb0cf7b4c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?O92gG3PUFJn63BCacKYEDeDs6/zkAbBZAZZ58VeZiU8lXgCvgWuIkKukxetV?= =?us-ascii?Q?Seylc8D6mFR/eoZ1XPxDhpWmy9P2oHrf2AbZnQuwjkzoq0Gx98h45BLMLKvN?= =?us-ascii?Q?bNo8hL/GA25DQ1nlRUcCfqMeYVLOQ7poPODZ93qzr41EU6oGmmuSa/PKxvfu?= =?us-ascii?Q?GAvMyb8io5/48AfM8tjVj97Vw3wqXJlKnNy0MSmJVgRAOVV34CCjCPUP1sct?= =?us-ascii?Q?vJ1dur08US83CBiBLLviKEddlOyYdEmSzaMr3/txwQUZx61+klDNRI0xeSlA?= =?us-ascii?Q?9OT0Nfl5PJlIjh/YQRb/yrCx4mGuZuV4efHlECbPaub5XpTRJTU4ifXPiI5h?= =?us-ascii?Q?p0D1YG0Y038YD7PHqXjGZEbuGQak3y54HcpRXwH70AwU69f3GkeASca+FgZ3?= =?us-ascii?Q?N2yOY7ReUkq1gzf/OzxpSAWF1cTlbrfZrUTVxyjnJiZJRKhGl82MkFFhQkYv?= =?us-ascii?Q?K9V27FVlTsQNoz8pf/1/oVVDIq6DdrOu+sbVgpOpir8PJboxu3MTXOh6PKSi?= =?us-ascii?Q?SobvA5Q5TUn9OM7botuj1obWEOX17vSFZobz46bbCYERHWem+vWnRy1NvDL8?= =?us-ascii?Q?V3oOtWLgeUmDUnkj2IANhCuQP1zAjDWhy/GIt+CyTB7VeFX/VB0+LVRdJjEv?= =?us-ascii?Q?9JcXJdi+ZnGgUViHgozGDGWhYZX7TEYBKieTqkDRlkPhYw2W4JeEzOwWYIQl?= =?us-ascii?Q?FyCCzStizqJjqj7R52WOoQRQmMO9I6N+F4tqZTbd82Sjh7Ubn1Qd9gGvJxBy?= =?us-ascii?Q?EUAzFl8/sXXqm199UArRdQ0ls60xd1QA7EaJAUCPhubMV1cXvm4wClhs8XRi?= =?us-ascii?Q?Yf+G7pXN4Lv7rMe7S7OQnTZ80bcXP+K4zpj2A+gzhuDFSE5icxQWI7TH4DlT?= =?us-ascii?Q?yrKBDLOTvQZi3oAyxCH2ctQ6EKI3A/J5H7dA+LKOnLDTu50nUnhXJpqIyX0W?= =?us-ascii?Q?OnpPFk45VGceMIV/J4DKpjMBYwwpR9Nmrx1pWYDEhSsSQRvv+IB9zFgjW436?= =?us-ascii?Q?F/xwDh8M2jJzx8Ceai5tvpKQogHknq8xR+OB4ZhTTeibo5DrocWmkbzXNTm3?= =?us-ascii?Q?lf9ykDyeIoCUKNvwhujCMLKgrp3QOf4hZVNnzRCIfD5Nn3Q0r9xr2Ao3SCfb?= =?us-ascii?Q?JYuadjCHzcxY1dmq1cyxLFmRKn381bbKWM/8p1ZPgEFMabr2Y5tQDqjoHHwR?= =?us-ascii?Q?rGRNyVuqWghCZVY1AuGNw6QBnDV/FBH88OT4d5FRJDnko13oHGEjkyj4qMO2?= =?us-ascii?Q?clr0VQbRRRccrmUTymeSac5Ene9nO/JEgW+tUNAWF5jYzzaF0x6hB1U2u2Ox?= =?us-ascii?Q?sK6Hj3WYGUJacKGDzBU1OOfrbQKZURCYezACsWkiwegg3RNGpGhmK4Jz2grw?= =?us-ascii?Q?7RxxX1N6elkefc6rPgR72d3XiiGEnHqa3umeBwmrGo7XXgNVhUsAVPcUrRgL?= =?us-ascii?Q?8tWkoSWKGYdiLWQPgwvOmwxoAqxWn3Fq?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jul 2024 19:40:35.1215 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cc339a2b-c3ab-47c5-656f-08dcb0cf7b4c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000A6733.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7707 Content-Type: text/plain; charset="utf-8" The RMPREAD instruction returns an architecture defined format of an RMP table entry. This is the preferred method for examining RMP entries. The instruction is advertised in CPUID 0x8000001f_EAX[21]. Use this instruction when available. Signed-off-by: Tom Lendacky --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/virt/svm/sev.c | 11 +++++++++++ 2 files changed, 12 insertions(+) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpuf= eatures.h index dd4682857c12..93620a4c5b15 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -447,6 +447,7 @@ #define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* Virtual TSC_AUX */ #define X86_FEATURE_SME_COHERENT (19*32+10) /* AMD hardware-enforced cache= coherency */ #define X86_FEATURE_DEBUG_SWAP (19*32+14) /* "debug_swap" AMD SEV-ES full= debug state swap support */ +#define X86_FEATURE_RMPREAD (19*32+21) /* RMPREAD instruction */ #define X86_FEATURE_SVSM (19*32+28) /* "svsm" SVSM present */ =20 /* AMD-defined Extended Feature 2 EAX, CPUID level 0x80000021 (EAX), word = 20 */ diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c index 103a2dd6e81d..73d4f422829a 100644 --- a/arch/x86/virt/svm/sev.c +++ b/arch/x86/virt/svm/sev.c @@ -301,6 +301,17 @@ static int get_rmpentry(u64 pfn, struct rmpentry *entr= y) { struct rmpentry_raw *e; =20 + if (cpu_feature_enabled(X86_FEATURE_RMPREAD)) { + int ret; + + asm volatile(".byte 0xf2, 0x0f, 0x01, 0xfd" + : "=3Da" (ret) + : "a" (pfn << PAGE_SHIFT), "c" (entry) + : "memory", "cc"); + + return ret; + } + e =3D __get_rmpentry(pfn); if (IS_ERR(e)) return PTR_ERR(e); --=20 2.43.2