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Sampat" , Scott Soule Cheloha , Ackerley Tng , Fuad Tabba , Dan Williams Subject: [RFC PATCH kernel 10/17] x86, dma: Allow accepted devices to map private memory Date: Wed, 16 Sep 2026 21:51:50 +1000 Message-ID: <20260916115159.1938195-11-aik@amd.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260916115159.1938195-1-aik@amd.com> References: <20260916115159.1938195-1-aik@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: BN1PEPF0001854A:EE_|SJ2PR12MB8111:EE_ X-MS-Office365-Filtering-Correlation-Id: c49f70c9-81ce-478f-dac0-08df13e9dd27 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|1800799024|376014|36860700016|7416014|82310400026|32650700020|11063799006|10067099003|56012099006|22082099003|18002099003; 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)(23010399003)(1800799024)(376014)(36860700016)(7416014)(82310400026)(32650700020)(11063799006)(10067099003)(56012099006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: qK/f3bcE1ASam6x2JuApZeSzxgwli4lwEhb+EPtO5GlbcvqWi2n0k+nCmOHidWa9c57wxnSKyVw6rpTH9uNaDmg3oJNXlIBXvGR1R/KFN/gP+3nnPsanWwrd57y/UdARYtTQx0oclZLQ0BGPI91gFjNkAlX5ujD1fxxig+qClAg8/i1f9m8YX9y28sjNZGmBEwP33TPzxrpHnN+hFi9AJNhz+zn1fgjuz4xCrtBlZIiJKBNAa55ix5MqPrc/Hp0hNMUb1/YlmECGfzThwtN1CwLiUVLLQlBKO1fcb1JIi5Qgv+5uPUz+SYTP5gl8NeH5pRlAUwiBM8wDq7PFX6NC37IA+rMpo1xfWlWcVjunL8MiE56oFApW110XZtgRGjDSOijBETZIzUKDFueWDJ8SMcnlpUO0wFZzFrYSoIR3W1JjxXGiUODmzMgF+4duPdAm X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Sep 2026 11:58:46.8022 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c49f70c9-81ce-478f-dac0-08df13e9dd27 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: BN1PEPF0001854A.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8111 From: Dan Williams With the arrival of "accepted" devices, devices that have been enabled to DMA to private encrypted memory, coherent DMA allocation no longer requires page conversion. Update force_dma_unencrypted() to skip accepted devices. Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: x86@kernel.org Cc: "H. Peter Anvin" Signed-off-by: Dan Williams [aik: re-added device_cc_accepted()] Signed-off-by: Alexey Kardashevskiy --- arch/x86/mm/mem_encrypt.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index 95bae74fdab2..805800ddbd79 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -20,10 +20,11 @@ bool force_dma_unencrypted(struct device *dev) { /* - * For SEV, all DMA must be to unencrypted addresses. + * Require unencrypted DMA unless the device has been "accepted", + * enabled by a TSM driver to DMA to private encrypted memory. */ if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) - return true; + return !__device_cc_accepted(dev); /* * For SME, all DMA must be to unencrypted addresses if the -- 2.55.0