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Wed, 13 Jul 2022 16:57:34 -0700 Date: Wed, 13 Jul 2022 16:57:32 -0700 From: Nicolin Chen To: , Alex Williamson Subject: Re: [PATCH v5 0/5] cover-letter: Simplify vfio_iommu_type1 attach/detach routine Message-ID: References: <20220701214455.14992-1-nicolinc@nvidia.com> <20220706114217.105f4f61.alex.williamson@redhat.com> <20220706120325.4741ff34.alex.williamson@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220706120325.4741ff34.alex.williamson@redhat.com> X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e132a6f9-c9a7-4f8e-9a24-08da652b7689 X-MS-TrafficTypeDiagnostic: SA1PR12MB5638:EE_ 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:12.22.5.238;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(136003)(346002)(376002)(39860400002)(396003)(36840700001)(46966006)(40470700004)(8936002)(7416002)(9686003)(7406005)(110136005)(83380400001)(26005)(55016003)(54906003)(186003)(5660300002)(47076005)(478600001)(336012)(316002)(426003)(966005)(8676002)(2906002)(41300700001)(36860700001)(40480700001)(81166007)(33716001)(82740400003)(40460700003)(82310400005)(356005)(4326008)(86362001)(70206006)(70586007)(36900700001);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 Wed, Jul 06, 2022 at 12:03:25PM -0600, Alex Williamson wrote: > On Wed, 6 Jul 2022 10:53:52 -0700 > Nicolin Chen wrote: > > > On Wed, Jul 06, 2022 at 11:42:17AM -0600, Alex Williamson wrote: > > > > > On Fri, 1 Jul 2022 14:44:50 -0700 > > > Nicolin Chen wrote: > > > > > > > This is a preparatory series for IOMMUFD v2 patches. It enforces error > > > > code -EMEDIUMTYPE in iommu_attach_device() and iommu_attach_group() when > > > > an IOMMU domain and a device/group are incompatible. It also drops the > > > > useless domain->ops check since it won't fail in current environment. > > > > > > > > These allow VFIO iommu code to simplify its group attachment routine, by > > > > avoiding the extra IOMMU domain allocations and attach/detach sequences > > > > of the old code. > > > > > > > > Worths mentioning the exact match for enforce_cache_coherency is removed > > > > with this series, since there's very less value in doing that as KVM will > > > > not be able to take advantage of it -- this just wastes domain memory. > > > > Instead, we rely on Intel IOMMU driver taking care of that internally. > > > > > > > > This is on github: > > > > https://github.com/nicolinc/iommufd/commits/vfio_iommu_attach > > > > > > How do you foresee this going in, I'm imagining Joerg would merge the > > > first patch via the IOMMU tree and provide a topic branch that I'd > > > merge into the vfio tree along with the remaining patches. Sound > > > right? Thanks, > > > > We don't have any build dependency between the IOMMU change and > > VFIO changes, yet, without the IOMMU one, any iommu_attach_group() > > failure now would be a hard failure without a chance falling back > > to a new_domain, which is slightly different from the current flow. > > > > For a potential existing use case that relies on reusing existing > > domain, I think it'd be safer to have Joerg acking the first change > > so you merge them all? Thank! > > Works for me, I'll look for buy-in + ack from Joerg. Thanks, > > Alex Joerg, would it be possible for you to ack at the IOMMU patch? Thanks! Nic _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel