Hi, On Mon, Jan 09, 2023 at 10:11:19PM +0100, Eric Auger wrote: > > Jean, do you have any idea about how to fix that? Do you think we have a > > trouble in the acpi/viot setup or virtio-iommu probe sequence. It looks > > like virtio probe and attach commands are called too early, before the > > bus is actually correctly numbered. > > So after further investigations looks this is not a problem of bus > number, which is good at the time of the virtio cmd calls but rather a > problem related to the devfn (0 was used when creating the IOMMU MR) > whereas the virtio-iommu cmds looks for the non aliased devfn. With that > fixed, the probe and attach at least succeeds. The device still does not > work for me but I will continue my investigations and send a tentative fix.
If I remember correctly VIOT can deal with bus numbers because bridges are assigned a range by QEMU, but I haven't tested that in detail, and I don't know how it holds with conventional PCI bridges. Do you have an example command-line I could use to experiment (and the fix you're mentioning)? Thanks, Jean
