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. SIOV's assigned to guests could use IMS, but the use cases we see in the short term can be handled by using SRIOV instead. I would expect in general for SIOV to use MSI-X emulation to expose interrupts - it would be really weird for a SIOV emulator to do something else and we should probably discourage that. Jason
