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Wed, 22 May 2024 20:09:14 -0700 Date: Wed, 22 May 2024 20:09:12 -0700 From: Nicolin Chen To: Jason Gunthorpe , "Tian, Kevin" CC: "will@kernel.org" , "robin.murphy@arm.com" , "suravee.suthikulpanit@amd.com" , "joro@8bytes.org" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-tegra@vger.kernel.org" , "Liu, Yi L" , "eric.auger@redhat.com" , "vasant.hegde@amd.com" , "jon.grimm@amd.com" , "santosh.shukla@amd.com" , "Dhaval.Giani@amd.com" , "shameerali.kolothum.thodi@huawei.com" Subject: Re: [PATCH RFCv1 00/14] Add Tegra241 (Grace) CMDQV Support (part 2/2) Message-ID: References: <20240522164818.GB20229@nvidia.com> <20240522232833.GH20229@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000042A7:EE_|MW4PR12MB6731:EE_ X-MS-Office365-Filtering-Correlation-Id: 2e79f045-2b4d-4815-cc20-08dc7ad5c441 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|82310400017|7416005|1800799015|36860700004|376005; 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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 Wed, May 22, 2024 at 11:43:51PM +0000, Tian, Kevin wrote: > > From: Jason Gunthorpe > > Sent: Thursday, May 23, 2024 7:29 AM > > On Wed, May 22, 2024 at 12:47:19PM -0700, Nicolin Chen wrote: > > > Yea, SMMU also has Event Queue and PRI queue. Though I haven't > > > got time to sit down to look at Baolu's work closely, the uAPI > > > seems to be a unified one for all IOMMUs. And though I have no > > > intention to be against that design, yet maybe there could be > > > an alternative in a somewhat HW specific language as we do for > > > invalidation? Or not worth it? > > > > I was thinking not worth it, I expect a gain here is to do as AMD has > > done and make the HW dma the queues directly to guest memory. > > > > IMHO the primary issue with the queues is DOS, as having any shared > > queue across VMs is dangerous in that way. Allowing each VIOMMU to > > have its own private queue and own flow control helps with that. > > > > and also shorter delivering path with less data copy? Should I interpret that as a yes for fault report via VQUEUE? We only have AMD that can HW dma the events to the guest queue memory. Others all need a backward translation of (at least) a physical dev ID to a virtual dev ID. This is now doable in the kernel by the ongoing vdev_id design by the way. So kernel then can write the guest memory directly to report events? Thanks Nicolin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel