From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from CH4PR04CU002.outbound.protection.outlook.com (mail-northcentralusazon11013051.outbound.protection.outlook.com [40.107.201.51]) (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 E5B0734F275 for ; Tue, 7 Apr 2026 06:33:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.201.51 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775543617; cv=fail; b=fsCxrACj802wQxPyiN0WU4dSxQlMKeHU33Ouh9gyBJwJqDIHRZB6iXY46AqCsBsI1ODn95z0QOXEn5AT4QMGP95xdwguMuWfKH2xy4rfmEsDEQQS8m9IvsdbnxBS8w/vCt9z2g2OiFunoFzLPM6Wm0QtHcw4TDFjObz9IXmVEIY= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775543617; c=relaxed/simple; bh=/uSBaYqZ4iHJDW/b9PzeyifqjkyYAvrnEKhUoy5tHvI=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EBfzu/N+MhSQRURCpOESu981zXOe+I2Kc9/gU4GEYheSJUL7V6zsDjrKOBxf62HWCBJ+pt0wFelFlgodzE5tIwgDOiZ+hcaWv81VOxAEPmUS1o9n6DPWlNW9+AdME8Z7/3YqO9zI7qKG0NrvTO0pDOyOpghKqxPeit2IQWaxiS8= 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=W7ye88jd; arc=fail smtp.client-ip=40.107.201.51 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="W7ye88jd" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=DG31KuvuNLmRh42Kf3W+d/m+GGPq3MekLEeHhMNUUyRTTw5+eDLsXcsLxzFKkzO4hD7+XKgSx4hxlSIJTaDd8Lr/StG4s5tCWzC080HZcdMhbgMzirf7b+MEH4jQOTExbxQtp9XDef6jM52SzqBHIPWsH8yqSh5VPUEvtcY614Zk3RWPF8I6RUkdrQKE5Z4kAcKoCyg1RGj81L3/WbUVm3VS2RKg2xuCNyA6kOkL13Nh4BY+G1rSdOy0OdhOy3tYXJ8x2MWI9cQj5cDxPALnnDnY1vQCAcno1yofF6dfubgo8z310SjcERcR/rjUVPBQ0uN3bXe3Ip/6SCf+QzUAeQ== 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=SnsVUkxrBOHlkSWWeLiCt93WJV+dPAJZ6mAJ64nuw8M=; b=IDELMI8fNKpOI5lJx3+96vz+HNc4Ox87BfY1vnWyds1jYewM/DDEaqajZ+bLrL6wPDnCpG8MZ4FdCKdkr/YUdzW/k7MdzWhyTb/4stnwnhhyeLIWIq5HPXK8uoo1t0EffY4GUZJIHbbJnVVPN9MNI8rkVosejl31I2+Xa89jB1e+1S3ZffdSFtVGywSDLGKMSUzJjj5DuST/vUea7tgk4dPc5XR2a0lHP1oKW7m10UekqJ3BSEiaPLPlhY6leQJhVmdQXVql2sjE+PAVKjAzKq6loPmMtvfEqJ9Ici4BbpajI7aex4Cnbk98I/MBfIPm0nzlqPXZ97JucE+zS1CTDQ== 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=SnsVUkxrBOHlkSWWeLiCt93WJV+dPAJZ6mAJ64nuw8M=; b=W7ye88jd+FxlAcnniwL4P4oaWUmwQ2gyFiq+pZwMXckPYSBv3M6H8h3dJvi8tKVwA+fR2hC42xYLl7KtSlinBQzisRNDaIyKv2mu+aO8mU3cZG4Jb1XYdmzm7wqPhErEpVllu2Yjjtj/Gaq7uZHUBVOrEsaEWrLke4QM5xESH1o= Received: from SJ0PR03CA0128.namprd03.prod.outlook.com (2603:10b6:a03:33c::13) by LV2PR12MB6013.namprd12.prod.outlook.com (2603:10b6:408:171::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.19; Tue, 7 Apr 2026 06:33:30 +0000 Received: from SJ1PEPF00002319.namprd03.prod.outlook.com (2603:10b6:a03:33c:cafe::dc) by SJ0PR03CA0128.outlook.office365.com (2603:10b6:a03:33c::13) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9769.32 via Frontend Transport; Tue, 7 Apr 2026 06:33:29 +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=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ1PEPF00002319.mail.protection.outlook.com (10.167.242.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.17 via Frontend Transport; Tue, 7 Apr 2026 06:33:29 +0000 Received: from gomati.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Tue, 7 Apr 2026 01:33:26 -0500 From: Nikunj A Dadhania To: , , CC: , , , , Subject: [PATCH v6 4/7] x86/cpufeatures: Add Page modification logging Date: Tue, 7 Apr 2026 06:32:42 +0000 Message-ID: <20260407063245.2755579-5-nikunj@amd.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20260407063245.2755579-1-nikunj@amd.com> References: <20260407063245.2755579-1-nikunj@amd.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002319:EE_|LV2PR12MB6013:EE_ X-MS-Office365-Filtering-Correlation-Id: ea5d2c7f-f9c3-4b99-8113-08de946f9532 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|376014|36860700016|22082099003|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(376014)(36860700016)(22082099003)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 2jX2ywWxI+khjv41OHuG05Gt6ZdBMr1lhPSPBTnNfbixKcMDWixGIhgjVdWk4OHAviGAJaWYhhvWQQ4gZxcnk2a1th+8gOPD7XPM+2APNJgwZduIMcPbmCTOjAzKrWCkDKRS/yILBco3UrUM5YLHA0tzg5+aZANKrTJ0brX/OX3vB/KaVSyY9XINXv53Bm9/ObbLYGiiE5g/bzZlPpwsoV3sDo0EPdZBMjILTU5K2Rb5a8ph0uaGgXZLlmyggrDlmKojooDNHwVq8qS/OVmkNvLB/r9gC8ney7Es/huBuNj87oG9kPWtYAL4zty5ILwYNeJeOnXY3eB3PLfakQMFkVwIgrjXYn5TXjJd2jJCerozMTusSVDuu3sNUuIk6P6pct2siNrPCNs25VuHrgvmdA92f+HlecoTaJjpAukhh6eSpQ2jCiTWimw1PHRXnFW/ X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Apr 2026 06:33:29.7238 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ea5d2c7f-f9c3-4b99-8113-08de946f9532 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002319.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB6013 Page modification logging(PML) is a hardware feature designed to track guest modified memory pages. PML enables the hypervisor to identify which pages in a guest's memory have been changed since the last checkpoint or during live migration. The PML feature is advertised via CPUID leaf 0x8000000A ECX[4] bit. Acked-by: Borislav Petkov (AMD) Signed-off-by: Nikunj A Dadhania --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kernel/cpu/scattered.c | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index dbe104df339b..8c669c9b11d0 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -228,6 +228,7 @@ #define X86_FEATURE_PVUNLOCK ( 8*32+20) /* PV unlock function */ #define X86_FEATURE_VCPUPREEMPT ( 8*32+21) /* PV vcpu_is_preempted function */ #define X86_FEATURE_TDX_GUEST ( 8*32+22) /* "tdx_guest" Intel Trust Domain Extensions Guest */ +#define X86_FEATURE_PML ( 8*32+23) /* AMD Page Modification logging */ /* Intel-defined CPU features, CPUID level 0x00000007:0 (EBX), word 9 */ #define X86_FEATURE_FSGSBASE ( 9*32+ 0) /* "fsgsbase" RDFSBASE, WRFSBASE, RDGSBASE, WRGSBASE instructions*/ diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c index 42c7eac0c387..cdda4e72c5e6 100644 --- a/arch/x86/kernel/cpu/scattered.c +++ b/arch/x86/kernel/cpu/scattered.c @@ -53,6 +53,7 @@ static const struct cpuid_bit cpuid_bits[] = { { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, { X86_FEATURE_AMD_FAST_CPPC, CPUID_EDX, 15, 0x80000007, 0 }, { X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 }, + { X86_FEATURE_PML, CPUID_ECX, 4, 0x8000000a, 0 }, { X86_FEATURE_X2AVIC_EXT, CPUID_ECX, 6, 0x8000000a, 0 }, { X86_FEATURE_COHERENCY_SFW_NO, CPUID_EBX, 31, 0x8000001f, 0 }, { X86_FEATURE_SMBA, CPUID_EBX, 2, 0x80000020, 0 }, -- 2.48.1