On Tue, Jan 27, 2026 at 09:11:14AM -0800, Nicolin Chen wrote:

quoted

It is easy to understand that lifecycle by just allocating it for the
lifetime of the VSMMU..

Yea, it makes sense for that matter.

So, perhaps:

VMID owned by a vSMMU should be allocated in the viommu_init callback for
 - a straightforward lifecycle for a VMID used by a vSMMU
 - HW like tegra241-cmdqv needs to setup VINTF with the VMID

Yeah, the cmdqv should take the VMID from the vSMMU and that is a good
reason to pre-allocate it since it won't go through the invalidation
list.

Jason