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Re: [PATCH v6 5/9] vfio/iommufd: Probe and request hwpt dirty tracking c
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From: |
Jason Gunthorpe |
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Subject: |
Re: [PATCH v6 5/9] vfio/iommufd: Probe and request hwpt dirty tracking capability |
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Date: |
Tue, 23 Jul 2024 08:59:05 -0300 |
On Tue, Jul 23, 2024 at 10:09:13AM +0200, Eric Auger wrote:
> > In pratice I don't know if such HW platforms even exist where different
> > IOMMU
> > instances present different value of dirty tracking, given that this is a
> > IOMMU
> > feature, rather than endpoint dependent. In x86 it's homogeneous, and
> > likely on
> > smmuv3 server too. There are indeed endpoint related features
> > which may be
> on ARM you may have several SMMU instances. I do agree that the
> likelyhood of those instances having heterogeneous dirty page
> tracking support is low but well I don't know. Maybe we should add a
> wanrning at least, later on if this case arises.
>From what I understand about ARM IP there are additional system wide
complexities to implement HTTU, it requires the SMMU have CPU coherent
atomics, which means it has to use a different kind of bus..
Hopefully nobody does this, but still, I wouldn't assume the same
consistency as x86...
Jason
[PATCH v6 2/9] vfio/{iommufd,container}: Remove caps::aw_bits, Joao Martins, 2024/07/22
[PATCH v6 7/9] vfio/iommufd: Implement VFIOIOMMUClass::query_dirty_bitmap support, Joao Martins, 2024/07/22
[PATCH v6 4/9] vfio/{iommufd, container}: Invoke HostIOMMUDevice::realize() during attach_device(), Joao Martins, 2024/07/22
- Re: [PATCH v6 4/9] vfio/{iommufd,container}: Invoke HostIOMMUDevice::realize() during attach_device(), Eric Auger, 2024/07/23
- Re: [PATCH v6 4/9] vfio/{iommufd,container}: Invoke HostIOMMUDevice::realize() during attach_device(), Cédric Le Goater, 2024/07/23
- Re: [PATCH v6 4/9] vfio/{iommufd,container}: Invoke HostIOMMUDevice::realize() during attach_device(), Eric Auger, 2024/07/23
- Re: [PATCH v6 4/9] vfio/{iommufd,container}: Invoke HostIOMMUDevice::realize() during attach_device(), Joao Martins, 2024/07/23
- Re: [PATCH v6 4/9] vfio/{iommufd,container}: Invoke HostIOMMUDevice::realize() during attach_device(), Cédric Le Goater, 2024/07/23
- Re: [PATCH v6 4/9] vfio/{iommufd,container}: Invoke HostIOMMUDevice::realize() during attach_device(), Eric Auger, 2024/07/23