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b=XgXWPtQbhL+jQXbbD5EDtB7Dxx1eCEdwNCUxL47QatWHibRFpXzrVA2FgBkicwuDU1WX1hqvjh9zM6s2OsD0BzuM3r/IOdCilMEwUBHvz/ftj5w9dOuKWhOtCAQ+w1wWJBPXbpuyrzo3nDgcbiWrq7bdyooZV7GnNWiBGmVOwH4= Authentication-Results: mx.microsoft.com 1; dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from BL4PR12MB9505.namprd12.prod.outlook.com (2603:10b6:208:591::16) by PH8PR12MB6820.namprd12.prod.outlook.com (2603:10b6:510:1cb::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.472.16; Fri, 2 Oct 2026 03:45:13 +0000 Received: from BL4PR12MB9505.namprd12.prod.outlook.com ([fe80::73aa:eb8c:a86b:5a83]) by BL4PR12MB9505.namprd12.prod.outlook.com ([fe80::73aa:eb8c:a86b:5a83%5]) with mapi id 15.21.0451.022; Fri, 2 Oct 2026 03:45:08 +0000 Message-ID: Date: Fri, 2 Oct 2026 09:14:59 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4] iommu/amd: Make PerfOpt compulsory To: "Mario Limonciello (AMD)" , Jason Gunthorpe Cc: Alex Deucher , Joerg Roedel , Suravee Suthikulpanit , "open list:RADEON and AMDGPU DRM DRIVERS" , open list , "open list:AMD IOMMU (AMD-VI)" References: <20261001182410.1525285-1-superm1@kernel.org> Content-Language: en-US From: Vasant Hegde In-Reply-To: <20261001182410.1525285-1-superm1@kernel.org> Content-Type: text/plain; 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Instead of leaving a policy knob in amdgpu, just turn it on when > an integrated GPU is in identity. > > PerfOpt locks the GPU into identity mode where the DTE is ignored, so mark > it require_direct (blocks VFIO/iommufd claims) and disable PASID (no GCR3 > table in the fast path). > > This drops quite a bit of compatibility glue. There was a refcounting > system, exported symbols, and device attach/detach logic. By just setting > it immediately it's a lot more straightforward. > > Suggested-by: Jason Gunthorpe > Signed-off-by: Mario Limonciello (AMD) > --- > v4: > * Disable PASID for PerfOpt devices > * Don't allow attaching a blocked domain This will block attaching device to guest via vfio-pci. Is that fine? -Vasant