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Sat, 11 Mar 2023 04:53:08 -0800 Date: Sat, 11 Mar 2023 04:53:07 -0800 From: Nicolin Chen To: Jason Gunthorpe CC: Robin Murphy , , , , , , , , , , Subject: Re: [PATCH v1 14/14] iommu/arm-smmu-v3: Add arm_smmu_cache_invalidate_user Message-ID: References: <1467e666-1b6c-c285-3f79-f8e8b088718b@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT089:EE_|BL1PR12MB5852:EE_ X-MS-Office365-Filtering-Correlation-Id: 4cdd582a-f792-44fa-4132-08db222f9196 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(396003)(346002)(136003)(39860400002)(376002)(451199018)(46966006)(40470700004)(36840700001)(82310400005)(33716001)(82740400003)(36860700001)(426003)(47076005)(54906003)(55016003)(6636002)(40480700001)(478600001)(26005)(7636003)(316002)(356005)(336012)(41300700001)(40460700003)(8936002)(186003)(9686003)(5660300002)(7416002)(4744005)(8676002)(2906002)(6862004)(4326008)(70586007)(86362001)(70206006);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Mar 11, 2023 at 03:56:56AM -0800, Nicolin Chen wrote: > I recall that one difficulty is to pass the vSID from the guest > down to the host kernel driver and to link with the pSID. What I > did previously for VCMDQ was to set the SID_MATCH register with > iommu_group_id(group) and set the SID_REPLACE register with the > pSID. Then hyper will use the iommu_group_id to search for the > pair of the registers, and to set vSID. Perhaps we should think > of something smarter. I just found that the CFGI_STE command has the SID field, yet we just didn't pack it in the data structure for a hwpt_alloc ioctl. So, perhaps it isn't that difficult at all. I'll try a bit of a test run next week. Thanks Nic _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel