On Fri, Jan 31, 2025 at 09:33:16AM +0000, Shameerali Kolothum Thodi wrote: > And Qemu does some checking to make sure that the device is indeed associated > with the specified phys-smmuv3. This can be done going through the sysfs > path checking > which is what I guess libvirt is currently doing to populate the topology. So > basically > Qemu is just replicating that to validate again.
I would prefer that iommufd users not have to go out to sysfs.. > Or another option is extending the IOMMU_GET_HW_INFO IOCTL to return the phys > smmuv3 base address which can avoid going through the sysfs. It also doesn't seem great to expose a physical address. But we could have an 'iommu instance id' that was a unique small integer? Jason
