On 06.10.22 19:48, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko <[email protected]>Use the same "xen-grant-dma" device concept (based on generic IOMMU device-tree bindings) for the PCI devices behind device-tree based PCI Host controller. Signed-off-by: Oleksandr Tyshchenko <[email protected]> --- Slightly RFC. This is needed to support Xen grant mappings for virtio-pci devices on Arm at some point in the future. The Xen toolstack side is not published yet. Here, for PCI devices we use the same way to pass backend domid to the guest as for platform devices.
I should mention we decided at the Xen Summit, that I will start a try to modify the virtio spec to include the backend id (domid in the Xen case) in the device independent config part. As this will take some time to be accepted (if ever), other means to specify the backend domid are needed until then. DT is one possibility (at least on Arm), while Xenstore is the way to go for setups with a Xen toolstack. Juergen
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