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...mat definitions need be consistently agreed across all those components. [...] > > 2. Sharing MMU page tables > -------------------------- > > The guest can share process page-tables with the physical IOMMU. To do > that, it sends PROBE_TABLE with (F_INDIRECT | F_NATIVE | F_FAULT). The > page table format is implicit, so the pg_format array can be empty (unless > the guest wants to query some specific property, e.g. number of levels > supported by the pIOMMU?). If the host answers with success, guest can > send its MMU page table details with ATTACH_TABLE and (F...

...mat definitions need be consistently agreed across all those components. [...] > > 2. Sharing MMU page tables > -------------------------- > > The guest can share process page-tables with the physical IOMMU. To do > that, it sends PROBE_TABLE with (F_INDIRECT | F_NATIVE | F_FAULT). The > page table format is implicit, so the pg_format array can be empty (unless > the guest wants to query some specific property, e.g. number of levels > supported by the pIOMMU?). If the host answers with success, guest can > send its MMU page table details with ATTACH_TABLE and (F...

...the page directory. 'nr_contexts' isn't used here. For both ATTACH and PROBE, 'flags' are the following (and will be explained later): VIRTIO_IOMMU_ATTACH_TABLE_F_INDIRECT (1 << 0) VIRTIO_IOMMU_ATTACH_TABLE_F_NATIVE (1 << 1) VIRTIO_IOMMU_ATTACH_TABLE_F_FAULT (1 << 2) Now 'model' is a bit tricky. We need to specify all possible page table formats and their parameters. I'm not well-versed in x86, s390 or other IOMMUs, so I'll just focus on the ARM world for this example. We basically have two page table models, with a multitude of...

This is the initial proposal for a paravirtualized IOMMU device using virtio transport. It contains a description of the device, a Linux driver, and a toy implementation in kvmtool. With this prototype, you can translate DMA to guest memory from emulated (virtio), or passed-through (VFIO) devices. In its simplest form, implemented here, the device handles map/unmap requests from the guest. Future

This is the initial proposal for a paravirtualized IOMMU device using virtio transport. It contains a description of the device, a Linux driver, and a toy implementation in kvmtool. With this prototype, you can translate DMA to guest memory from emulated (virtio), or passed-through (VFIO) devices. In its simplest form, implemented here, the device handles map/unmap requests from the guest. Future