On Wed, Apr 09, 2025 at 04:30:17PM -0700, Dan Williams wrote: > > Thanks, I should've highlighted that facet most certainly! > > One would hope that no one is building a modern device with trusted I/O > capability, *and* with a swiotlb addressing dependency. However, I agree > that a non-shared swiotlb would be needed in such a scenario.
Hope is never a good idea when dealing with hardware :( PCIe already requires no addressing limitations, and programming interface specs like NVMe double down on that. But at least one big hyperscaler still managed to build such a device. Also even if the periphal device is not addressing limited, the root port or interconnect might still be, we've seen quite a lot of that.
