> +
> + if (!dma->pfnmap) {
> + struct vfio_device *device;
> + unsigned long base_pfn;
> + struct pfnmap_obj *pfnmap;
Please factor this whole block into a separate helper to keep it
readable.
Impose a new default strict MMIO mapping mode where the vma for
a VM_PFNMAP mapping must be backed by a vfio device. This allows
holding a reference to the device and registering a notifier for the
device, which additionally keeps the device in an IOMMU context for
the extent of the DMA mapping.
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