On Wed, Nov 11, 2020 at 02:17:48AM +0000, Tian, Kevin wrote: > > From: Jason Gunthorpe <jgg@xxxxxxxxxx> > > Sent: Tuesday, November 10, 2020 10:24 PM > > > > On Tue, Nov 10, 2020 at 06:13:23AM -0800, Raj, Ashok wrote: > > > > > This isn't just for idxd, as I mentioned earlier, there are vendors other > > > than Intel already working on this. In all cases the need for guest direct > > > manipulation of interrupt store hasn't come up. From the discussion, it > > > seems like there are devices today or in future that will require direct > > > manipulation of interrupt store in the guest. This needs additional work > > > in both the device hardware providing the right plumbing and OS work to > > > comprehend those. > > > > We'd want to see SRIOV's assigned to guests to be able to use > > IMS. This allows a SRIOV instance in a guest to spawn SIOV's which is > > useful. > > Does your VF support both MSI/IMS or IMS only? Of course VF's support MSI.. > If it is the former can't we adopt a phased approach or parallel > effort between forcing guest to use MSI and adding hypercall to > enable IMS on VF? Finding a way to disable IMS is anyway required > per earlier discussion when hypercall is not available, and it could > still provide a functional though suboptimal model for such VFs. Sure, I view that as the bare minimum Jason
