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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by MN1PEPF0000ECDA.mail.protection.outlook.com (10.167.242.134) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.360.3 via Frontend Transport; Fri, 21 Aug 2026 07:42:05 +0000 Received: from [10.85.45.224] (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 15.2.2562.45; Fri, 21 Aug 2026 02:41:55 -0500 Message-ID: Date: Fri, 21 Aug 2026 13:11:53 +0530 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird CC: Subject: Re: [PATCH v4 7/7] iommu/amd: Provide kernel command line option to enable GAPPI To: Randy Dunlap , "Borislav Petkov (AMD)" , "H. Peter Anvin" , "Joerg Roedel (AMD)" , "Paul E. McKenney" , Andrew Morton , Breno Leitao , "Christian Brauner" , Dapeng Mi , "Dave Hansen" , Eric Biggers , Ingo Molnar , Jakub Kicinski , "Jonathan Corbet" , Kiryl Shutsemau , Li RongQing , Marco Elver , Paolo Bonzini , Rick Edgecombe , "Robin Murphy" , Sean Christopherson , "Shuah Khan" , Suravee Suthikulpanit , Thomas Gleixner , "Vasant Hegde" , Will Deacon , , , , , , References: <20260821055611.27138-1-sarunkod@amd.com> <20260821055611.27138-8-sarunkod@amd.com> <352a7732-86e7-437a-9e2e-e1e117bbe95a@infradead.org> From: Sairaj Kodilkar Content-Language: en-US In-Reply-To: <352a7732-86e7-437a-9e2e-e1e117bbe95a@infradead.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECDA:EE_|DS2PR12MB9752:EE_ X-MS-Office365-Filtering-Correlation-Id: 433f2de1-0ac5-461d-8a91-08deff57b280 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|1800799024|7416014|376014|82310400026|921020|56012099006|3023799007|11063799006|4143699003|22082099003|18002099003|10067099003; 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)(36860700016)(23010399003)(1800799024)(7416014)(376014)(82310400026)(921020)(56012099006)(3023799007)(11063799006)(4143699003)(22082099003)(18002099003)(10067099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: uZSJmLPGpFRisg96X7ElX15sgK4oavgu7R15k/pyBRCV5NYIMYfABq2p5RXiIu+q3qkplS9l33jOQOWG7LWd04YN+IBiCg/OdR/RK88maNDwZZHAZP/n2aVYrwRBr6t559l6ISGodYaE4i7AlbuhO9jyymKDatFv3Bf0/uEy13dZ5PQxfpDBTXAa4bup4uhN2wnHCMlXbZRBI5h1ixUA5H2WMSsmTOLTFiBFKZYIY24bMtznY40PbP2kgYUUs5KtMycTWKV/7fJnekTtfcHwYTSvwRk5JavOP9T8ZDviVM1/RwD4c/lhkmm4LXpNkCYJRm98zl+rmgNEsUUua+GTbIaJQoTgdcjciqZidmXbPaJcg2aAFZqB+aTqPEio+lnScbN6lLcPQ6kW0LZYXbI6A6eiN73lEPEIR2wNSjQgYb/9McAa5wuO0gs7+Xas+OiC X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Aug 2026 07:42:05.4749 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 433f2de1-0ac5-461d-8a91-08deff57b280 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: MN1PEPF0000ECDA.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS2PR12MB9752 On 8/21/2026 11:43 AM, Randy Dunlap wrote: > > > On 8/20/26 10:56 PM, Sairaj Kodilkar wrote: >> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt >> index 97007f4f69d4..7bea1bbaa0e0 100644 >> --- a/Documentation/admin-guide/kernel-parameters.txt >> +++ b/Documentation/admin-guide/kernel-parameters.txt >> @@ -455,7 +455,8 @@ Kernel parameters >> to 4 KiB. >> v2_pgsizes_only - Limit page-sizes used for v1 page-tables >> to 4KiB/2Mib/1GiB. >> - >> + gappi - Use GAPPI instead of GALOG for vCPU >> + wakeup notification. > > Is GALOG documented somewhere? Should it be? > I can't find it... Its not documented. Maybe we can add small documentation in arch/x86/iommu.rst Thanks Sairaj > > thanks.