Re: [PATCH v5 5/9] iommufd: Add an ioctl to query PA from IOVA for noiommu mode

[Jason Gunthorpe]

On Wed, May 20, 2026 at 03:20:15PM +0800, Yi Liu wrote:

> can this work for normal vfio usage as well? e.g. vfio usages that open
> devices that have iommu procetction.

No, it must be blocked we cannot leak physical addresses to userspace.

> My concern is kernel does not prevent normal vfio usage from invoking
> this ioctl. If it works for normal vfio usage as well, may just remove
> the noiommu term from thie name. If not, may be

This is a bug

Jason