On Fri, Nov 08, 2024 at 12:52:37PM +0000, Shameer Kolothum via wrote: > Hi, > > This series adds initial support for a user-creatable "arm-smmuv3-nested" > device to Qemu. At present the Qemu ARM SMMUv3 emulation is per machine > and cannot support multiple SMMUv3s. > > In order to support vfio-pci dev assignment with vSMMUv3, the physical > SMMUv3 has to be configured in nested mode. Having a pluggable > "arm-smmuv3-nested" device enables us to have multiple vSMMUv3 for Guests > running on a host with multiple physical SMMUv3s. A few benefits of doing > this are,
I'm not very familiar with arm, but from this description I'm not really seeing how "nesting" is involved here. You're only talking about the host and 1 L1 guest, no L2 guest. Also what is the relation between the physical SMMUv3 and the guest SMMUv3 that's referenced ? Is this in fact some form of host device passthrough rather than nesting ? With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
