On Mon, Mar 17, 2025 at 12:10:19PM -0700, Nicolin Chen wrote: > Another question: how does an emulated device work with a vSMMUv3? > I could imagine that all the accel steps would be bypassed since > !sdev->idev. Yet, the emulated iotlb should cache its translation > so we will need to flush the iotlb, which will increase complexity > as the TLBI command dispatching function will need to be aware what > ASID is for emulated device and what is for vfio device..
I think you should block it. We already expect different vSMMU's depending on the physical SMMU under the PCI device, it makes sense that a SW VFIO device would have it's own, non-accelerated, vSMMU model in the guest. Jason
