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

[Yi Liu]

On 5/20/26 22:22, Jason Gunthorpe wrote:
> 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

got it. After a second look, I got where it gets failed.

+	if (!area->storage_domain ||
+	    area->storage_domain->owner != &iommufd_noiommu_ops) {
+		rc = -EOPNOTSUPP;
+		goto unlock_exit;
+	}

Regards,
Yi Liu