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Fri, 15 Nov 2024 14:32:29 -0800 Received: from rnnvmail205.nvidia.com (10.129.68.10) by rnnvmail205.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.4; Fri, 15 Nov 2024 14:32:29 -0800 Received: from Asurada-Nvidia (10.127.8.12) by mail.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.4 via Frontend Transport; Fri, 15 Nov 2024 14:32:28 -0800 Date: Fri, 15 Nov 2024 14:32:26 -0800 From: Nicolin Chen To: Shameerali Kolothum Thodi CC: "eric.auger@redhat.com" , "qemu-arm@nongnu.org" , "qemu-devel@nongnu.org" , "peter.maydell@linaro.org" , "jgg@nvidia.com" , "ddutile@redhat.com" , Linuxarm , "Wangzhou (B)" , jiangkunkun , Jonathan Cameron , "zhangfei.gao@linaro.org" Subject: Re: [RFC PATCH 2/5] hw/arm/smmuv3: Add initial support for SMMUv3 Nested device Message-ID: References: <20241108125242.60136-1-shameerali.kolothum.thodi@huawei.com> <20241108125242.60136-3-shameerali.kolothum.thodi@huawei.com> <00e8a5d6-c926-44bb-8d11-dab4ddc4820d@redhat.com> <7a3b6dcb5db349f5a7e718784ef46c97@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; 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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge1.nvidia.com; CAT:NONE; SFS:(13230040)(1800799024)(36860700013)(7416014)(376014)(82310400026); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Nov 2024 22:32:42.6003 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4e6b1f6e-0944-49fc-d350-08dd05c56b8c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF00021F6E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6432 Received-SPF: softfail client-ip=2a01:111:f403:2414::61f; envelope-from=nicolinc@nvidia.com; helo=NAM11-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.12, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Nov 14, 2024 at 08:20:08AM +0000, Shameerali Kolothum Thodi wrote: > > > diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h index > > > 46f48fe561..50e47a4ef3 100644 > > > --- a/include/hw/arm/virt.h > > > +++ b/include/hw/arm/virt.h > > > @@ -50,6 +50,9 @@ > > > /* MMIO region size for SMMUv3 */ > > > #define SMMU_IO_LEN 0x20000 > > > > > > +/* Max supported nested SMMUv3 */ > > > +#define MAX_SMMU_NESTED 128 > > Ouch, that many?! > > 😊. I just came up with the max we can support the allocated MMIO space. > We do have systems at present which has 8 physical SMMUv3s at the moment. > Probably 16/32 would be a better number I guess. FWIW, we have systems having 20 physical SMMUs at this moment :) Thanks Nicolin