From: Jason Gunthorpe <jgg@nvidia.com>
To: Eric Auger <eric.auger@redhat.com>
Cc: Joao Martins <joao.m.martins@oracle.com>,
qemu-devel@nongnu.org, Yi Liu <yi.l.liu@intel.com>,
Zhenzhong Duan <zhenzhong.duan@intel.com>,
Alex Williamson <alex.williamson@redhat.com>,
Cedric Le Goater <clg@redhat.com>,
Avihai Horon <avihaih@nvidia.com>
Subject: Re: [PATCH v6 5/9] vfio/iommufd: Probe and request hwpt dirty tracking capability
Date: Tue, 23 Jul 2024 08:59:05 -0300 [thread overview]
Message-ID: <20240723115905.GL3371438@nvidia.com> (raw)
In-Reply-To: <9245593d-4347-422d-8cd1-d1e694e93562@redhat.com>
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
next prev parent reply other threads:[~2024-07-23 12:05 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-22 21:13 [PATCH v6 0/9] hw/iommufd: IOMMUFD Dirty Tracking Joao Martins
2024-07-22 21:13 ` [PATCH v6 1/9] vfio/iommufd: Introduce auto domain creation Joao Martins
2024-07-23 4:38 ` Duan, Zhenzhong
2024-07-23 6:57 ` Cédric Le Goater
2024-07-23 7:18 ` Eric Auger
2024-07-22 21:13 ` [PATCH v6 2/9] vfio/{iommufd,container}: Remove caps::aw_bits Joao Martins
2024-07-23 7:21 ` Eric Auger
2024-07-22 21:13 ` [PATCH v6 3/9] vfio/iommufd: Add hw_caps field to HostIOMMUDeviceCaps Joao Martins
2024-07-23 5:11 ` Duan, Zhenzhong
2024-07-23 7:26 ` Eric Auger
2024-07-22 21:13 ` [PATCH v6 4/9] vfio/{iommufd, container}: Invoke HostIOMMUDevice::realize() during attach_device() Joao Martins via
2024-07-23 7:38 ` [PATCH v6 4/9] vfio/{iommufd,container}: " Eric Auger
2024-07-23 7:44 ` Cédric Le Goater
2024-07-23 7:55 ` Eric Auger
2024-07-23 8:05 ` Joao Martins
2024-07-23 8:08 ` Cédric Le Goater
2024-07-23 8:10 ` Eric Auger
2024-07-23 8:20 ` Duan, Zhenzhong
2024-07-23 8:24 ` Eric Auger
2024-07-23 8:26 ` Joao Martins
2024-07-23 7:53 ` Joao Martins
2024-07-23 8:00 ` Cédric Le Goater
2024-07-22 21:13 ` [PATCH v6 5/9] vfio/iommufd: Probe and request hwpt dirty tracking capability Joao Martins
2024-07-23 5:11 ` Duan, Zhenzhong
2024-07-23 6:13 ` Joao Martins
2024-07-23 6:57 ` Cédric Le Goater
2024-07-23 7:02 ` Duan, Zhenzhong
2024-07-23 7:50 ` Eric Auger
2024-07-23 8:00 ` Joao Martins
2024-07-23 8:09 ` Eric Auger
2024-07-23 8:17 ` Joao Martins
2024-07-23 11:59 ` Jason Gunthorpe [this message]
2024-07-22 21:13 ` [PATCH v6 6/9] vfio/iommufd: Implement VFIOIOMMUClass::set_dirty_tracking support Joao Martins
2024-07-23 8:03 ` Eric Auger
2024-07-23 8:14 ` Joao Martins
2024-07-23 8:17 ` Eric Auger
2024-07-22 21:13 ` [PATCH v6 7/9] vfio/iommufd: Implement VFIOIOMMUClass::query_dirty_bitmap support Joao Martins
2024-07-22 21:13 ` [PATCH v6 8/9] vfio/migration: Don't block migration device dirty tracking is unsupported Joao Martins
2024-07-23 4:45 ` Duan, Zhenzhong
2024-07-23 8:22 ` Eric Auger
2024-07-22 21:13 ` [PATCH v6 9/9] vfio/common: Allow disabling device dirty page tracking Joao Martins
2024-07-23 5:05 ` Duan, Zhenzhong
2024-07-23 8:31 ` Eric Auger
2024-07-23 8:42 ` Joao Martins
2024-07-23 10:11 ` Eric Auger
2024-07-23 8:35 ` [PATCH v6 0/9] hw/iommufd: IOMMUFD Dirty Tracking Cédric Le Goater
2024-07-23 8:56 ` Joao Martins
2024-07-23 9:08 ` Cédric Le Goater
2024-07-23 14:23 ` Yi Liu
2024-07-23 14:21 ` Joao Martins
2024-07-23 14:24 ` Cédric Le Goater
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