From: Lu Baolu <baolu.lu@linux.intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>, Bjorn Helgaas <helgaas@kernel.org>
Cc: baolu.lu@linux.intel.com, Christoph Hellwig <hch@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Joerg Roedel <joro@8bytes.org>,
Alex Williamson <alex.williamson@redhat.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Kevin Tian <kevin.tian@intel.com>,
Ashok Raj <ashok.raj@intel.com>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Dan Williams <dan.j.williams@intel.com>,
rafael@kernel.org, Diana Craciun <diana.craciun@oss.nxp.com>,
Cornelia Huck <cohuck@redhat.com>,
Eric Auger <eric.auger@redhat.com>, Liu Yi L <yi.l.liu@intel.com>,
Jacob jun Pan <jacob.jun.pan@intel.com>,
Chaitanya Kulkarni <kch@nvidia.com>,
Stuart Yoder <stuyoder@gmail.com>,
Laurentiu Tudor <laurentiu.tudor@nxp.com>,
Thierry Reding <thierry.reding@gmail.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Jonathan Hunter <jonathanh@nvidia.com>,
Li Yang <leoyang.li@nxp.com>, Dmitry Osipenko <digetx@gmail.com>,
iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 01/14] iommu: Add dma ownership management interfaces
Date: Thu, 6 Jan 2022 11:18:24 +0800 [thread overview]
Message-ID: <370335ad-0a2f-3668-9229-c65896f12828@linux.intel.com> (raw)
In-Reply-To: <20220104192348.GK2328285@nvidia.com>
On 1/5/22 3:23 AM, Jason Gunthorpe wrote:
>>>> The vfio oriented interfaces are,
>>>>
>>>> int iommu_group_set_dma_owner(struct iommu_group *group,
>>>> void *owner);
>>>> void iommu_group_release_dma_owner(struct iommu_group *group);
>>>> bool iommu_group_dma_owner_claimed(struct iommu_group *group);
>>>>
>>>> The device userspace assignment must be disallowed if the set dma owner
>>>> interface returns failure.
>> Can you connect this back to the "never a mixture" from the beginning?
>> If all you cared about was prevent an IOMMU group from containing
>> devices with a mixture of kernel drivers and userspace drivers, I
>> assume you could do that without iommu_device_use_dma_api(). So is
>> this a way to*allow* a mixture under certain restricted conditions?
> It is not about user/kernel, it is about arbitrating the shared
> group->domain against multiple different requests to set it to
> something else.
>
> Lu, Given that the word 'user' was deleted from the API entirely it
> makes sense to reword these commit messages to focus less on user vs
> kernel and more on ownership of the domain pointer.
Sure. Will do it.
Best regards,
baolu
next prev parent reply other threads:[~2022-01-06 3:19 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-04 1:56 [PATCH v5 00/14] Fix BUG_ON in vfio_iommu_group_notifier() Lu Baolu
2022-01-04 1:56 ` [PATCH v5 01/14] iommu: Add dma ownership management interfaces Lu Baolu
2022-01-04 10:08 ` Christoph Hellwig
2022-01-04 16:41 ` Bjorn Helgaas
2022-01-04 19:23 ` Jason Gunthorpe
2022-01-06 3:18 ` Lu Baolu [this message]
2022-01-06 3:54 ` Lu Baolu
2022-01-06 15:46 ` Jason Gunthorpe
2022-01-07 1:50 ` Lu Baolu
2022-01-06 3:43 ` Lu Baolu
2022-01-06 3:47 ` Lu Baolu
2022-01-06 3:51 ` Lu Baolu
2022-01-05 6:57 ` Lu Baolu
2022-01-04 1:56 ` [PATCH v5 02/14] driver core: Add dma_cleanup callback in bus_type Lu Baolu
2022-01-04 10:08 ` Christoph Hellwig
2022-01-04 12:39 ` Jason Gunthorpe
2022-01-04 13:04 ` Greg Kroah-Hartman
2022-02-08 5:55 ` Lu Baolu
2022-02-08 11:35 ` Greg Kroah-Hartman
2022-02-14 10:01 ` Greg Kroah-Hartman
2022-02-14 10:02 ` Greg Kroah-Hartman
2022-01-04 1:56 ` [PATCH v5 03/14] amba: Stop sharing platform_dma_configure() Lu Baolu
2022-01-04 1:56 ` [PATCH v5 04/14] driver core: platform: Add driver dma ownership management Lu Baolu
2022-02-14 9:59 ` Greg Kroah-Hartman
2022-02-14 13:18 ` Jason Gunthorpe
2022-02-14 13:37 ` Greg Kroah-Hartman
2022-02-14 13:43 ` Jason Gunthorpe
2022-01-04 1:56 ` [PATCH v5 05/14] amba: " Lu Baolu
2022-01-04 1:56 ` [PATCH v5 06/14] bus: fsl-mc: " Lu Baolu
2022-01-04 1:56 ` [PATCH v5 07/14] PCI: " Lu Baolu
2022-02-14 10:03 ` Greg Kroah-Hartman
2022-02-14 12:38 ` Jason Gunthorpe
2022-02-14 12:51 ` Greg Kroah-Hartman
2022-02-14 13:11 ` Jason Gunthorpe
2022-02-14 13:39 ` Greg Kroah-Hartman
2022-02-14 13:43 ` Jason Gunthorpe
2022-02-15 3:06 ` Lu Baolu
2022-02-23 18:00 ` Bjorn Helgaas
2022-02-23 18:07 ` Jason Gunthorpe
2022-01-04 1:56 ` [PATCH v5 08/14] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming Lu Baolu
2022-01-04 1:56 ` [PATCH v5 09/14] PCI: portdrv: " Lu Baolu
2022-01-04 17:06 ` Bjorn Helgaas
2022-01-04 19:26 ` Jason Gunthorpe
2022-01-04 19:51 ` Bjorn Helgaas
2022-01-05 0:35 ` Jason Gunthorpe
2022-01-06 4:12 ` Lu Baolu
2022-01-06 18:32 ` Bjorn Helgaas
2022-01-07 1:53 ` Lu Baolu
2022-01-04 1:56 ` [PATCH v5 10/14] vfio: Set DMA ownership for VFIO devices Lu Baolu
2022-01-04 1:56 ` [PATCH v5 11/14] vfio: Remove use of vfio_group_viable() Lu Baolu
2022-01-04 1:56 ` [PATCH v5 12/14] vfio: Delete the unbound_list Lu Baolu
2022-01-04 1:56 ` [PATCH v5 13/14] vfio: Remove iommu group notifier Lu Baolu
2022-01-04 1:56 ` [PATCH v5 14/14] iommu: Remove iommu group changes notifier Lu Baolu
2022-01-04 12:48 ` [PATCH v5 00/14] Fix BUG_ON in vfio_iommu_group_notifier() Jason Gunthorpe
2022-01-05 6:52 ` Lu Baolu
2022-02-18 1:07 ` Lu Baolu
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