On Thu, Jun 17, 2021 at 08:04:38PM -0300, Jason Gunthorpe wrote: > On Thu, Jun 17, 2021 at 03:02:33PM +1000, David Gibson wrote: > > > In other words, do we really have use cases where we need to identify > > different devices IDs, even though we know they're not isolated. > > I think when PASID is added in and all the complexity that brings, it > does become more important, yes. > > At the minimum we should scope the complexity. > > I'm not convinced it is so complicated, really it is just a single bit > of information toward userspace: 'all devices in this group must use > the same IOASID' Um.. no? You could have devA and devB sharing a RID, but then also sharing a group but not a RID with devC because of different isolation issues. So you now have (at least) two levels of group structure to expose somehow. > > Something like qemu consumes this bit and creates the pci/pcie bridge > to model this to the guest and so on. > > Something like dpdk just doesn't care (same as today). > > Jason > -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
Attachment:
signature.asc
Description: PGP signature
