From patchwork Fri Oct 4 05:33:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manali Shukla X-Patchwork-Id: 833143 Received: from NAM04-BN8-obe.outbound.protection.outlook.com (mail-bn8nam04on2067.outbound.protection.outlook.com [40.107.100.67]) (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 0AC4A4E1CA; Fri, 4 Oct 2024 05:34:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.100.67 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728020050; cv=fail; b=jRSVqIp9z7Pqt6tJxkuuse8cQeLX+OCnwxwTGQLIxJrBRwk/AH4hNqhPG+Ry0O0XTNUFGfFSe/q/iZIibAhZ6ps9HDrw+eAAvzK6Nb7z0argBQcQUOeys6qf3gcNhiWFebDpaJBTfD7g6uEfn4jo6WLlJdkDouFbsvtoTehSg9g= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728020050; c=relaxed/simple; bh=OswI/hEF8eFzEhj0t5ju8ib/RdAClRd9j48wGTeArCk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=YMds6wZX6lgR6Q7FdKa69eqaq7oPKGe9qrjujaFCS/LDSNlrtTrYdYa3lyzHOc2N+AxhPBIaVtVZrDUmJAjnRmLKCFTW8xmq3FUiuU42TU1U94onzZgm8lNC/BE3C1tigvn78lL3WEeDEvGvRvLCoHIZM5QAarcHUJowO/VlNtc= 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=wMaeVq/2; arc=fail smtp.client-ip=40.107.100.67 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="wMaeVq/2" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=MbzEGMnVgea45/LmXbRG5W74Ldvmvr9Q57iyjtnIdd1waa5gG7rTfDtuVFBXBVeOuiq1Ubl9zT4zfcR1wPq+/cRyzbsmi4MDbjJEu8lZr4RBPStV+CLikWUp0Ui2gzZlsJnEFNphuOuWMlnAWtpOjQjiIXCzR4hwLugYIWUXPMnYieUVchnlr6UXsps4mGqsVtJa35gT/zkzNpteazSVhSVZPQT1B6T9TxUJ2X1hWh6gjN+EOVYLgWSJA3DoAVZ2SsbA7sIbtZmNqCUmskoXk9qW6maU8olYE4x0VgU3Wx6dkfTVeiJlMo6bRCUYU79UjanEbGPz7qKsVYuJXjo16Q== 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=c/Lm0mCfn1GVpAXQ4WMcHLi7/LD9RQcYLhewAIPAPX8=; b=PJdtjtqc3QcyzaG8RG8M1oe8K34/va8xAoDiBm6OtEQXWxB6UCHLoi9czlX4V2iaDuYnE0AyDTKH5H0x+dpxPoA/wYaMnmt8gl8i3shY2E2cAZsl1iQBclMIuN/TrqlwbarpQr3/DEhsB6P4xP+iDhBxphI/jJRIW0/4l8/koKCg0cXTdmyDa+xQhk91WU0ILEBtw2VToKesqEAbEAtF3E26n/wxA6GQikslkyRNm1tjAFXxSFr5GV8OQ/Mot83WgZTTf8Dm+8T4D7PbPM799UZ1nPeMSqR1A6/phjqc0A/Exv+kzaHnQGgLluaeHkcY/ZlDSE83igEhbqk8sKRZkg== 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=c/Lm0mCfn1GVpAXQ4WMcHLi7/LD9RQcYLhewAIPAPX8=; b=wMaeVq/2yjjlnCnQsl3SKPLBALxvBrpr+xlvyoAqT2xAMsRnWNE2klMyp8tBwU2gBauKth5i6PqLucWBPlAe+a9O659a1wuU8T6pYcLoG9/LS3ToAQMEredccY579cU3wJ2XWk6c7ZU2vHDeIGozrH/kpLEA8Y7whGXnofbOUP0= Received: from BN8PR04CA0019.namprd04.prod.outlook.com (2603:10b6:408:70::32) by BY5PR12MB4051.namprd12.prod.outlook.com (2603:10b6:a03:20c::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8026.16; Fri, 4 Oct 2024 05:34:05 +0000 Received: from BL6PEPF0001AB59.namprd02.prod.outlook.com (2603:10b6:408:70:cafe::d0) by BN8PR04CA0019.outlook.office365.com (2603:10b6:408:70::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8026.18 via Frontend Transport; Fri, 4 Oct 2024 05:34:04 +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 BL6PEPF0001AB59.mail.protection.outlook.com (10.167.241.11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8026.11 via Frontend Transport; Fri, 4 Oct 2024 05:34:04 +0000 Received: from chalupa-d178host.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; Fri, 4 Oct 2024 00:34:01 -0500 From: Manali Shukla To: , CC: , , , , , , , , Subject: [PATCH v3 3/4] KVM: X86: Add documentation about behavioral difference for KVM_EXIT_BUS_LOCK Date: Fri, 4 Oct 2024 05:33:40 +0000 Message-ID: <20241004053341.5726-4-manali.shukla@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241004053341.5726-1-manali.shukla@amd.com> References: <20241004053341.5726-1-manali.shukla@amd.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: BL6PEPF0001AB59:EE_|BY5PR12MB4051:EE_ X-MS-Office365-Filtering-Correlation-Id: 55aa22ec-0f07-402f-56ea-08dce4362918 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|376014|36860700013|1800799024|82310400026|30052699003; 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:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(376014)(36860700013)(1800799024)(82310400026)(30052699003); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Oct 2024 05:34:04.7970 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 55aa22ec-0f07-402f-56ea-08dce4362918 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: BL6PEPF0001AB59.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4051 Add a note about behavioral difference for KVM_EXIT_X86_BUS_LOCK between AMD CPUs and Intel CPUs in KVM_CAP_X86_BUS_LOCK_EXIT capability documentation. Signed-off-by: Manali Shukla --- Documentation/virt/kvm/api.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index e32471977d0a..49465323dc62 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -7884,6 +7884,10 @@ Note! Detected bus locks may be coincident with other exits to userspace, i.e. KVM_RUN_X86_BUS_LOCK should be checked regardless of the primary exit reason if userspace wants to take action on all detected bus locks. +Note! On AMD CPUs, the bus lock exit to user space occurs with RIP pointing at +the offending instruction. In contrast, on Intel CPUs, the RIP points to the +instruction right after the guilty one after the bus lock exit to user space. + 7.23 KVM_CAP_PPC_DAWR1 ----------------------