RE: [PATCH v2 00/19] iommufd: Add VIOMMU infrastructure (Part-1)

[Tian, Kevin]

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Wednesday, August 28, 2024 1:00 AM
> 
[...]
> On a multi-IOMMU system, the VIOMMU object can be instanced to the
> number
> of vIOMMUs in a guest VM, while holding the same parent HWPT to share
> the

Is there restriction that multiple vIOMMU objects can be only created
on a multi-IOMMU system?

> stage-2 IO pagetable. Each VIOMMU then just need to only allocate its own
> VMID to attach the shared stage-2 IO pagetable to the physical IOMMU:

this reads like 'VMID' is a virtual ID allocated by vIOMMU. But from the
entire context it actually means the physical 'VMID' allocated on the
associated physical IOMMU, correct?