Pull xen updates from Juergen Gross:

 - a small cleanup removing "export" of an __init function

 - a small series adding a new infrastructure for platform flags

 - a series adding generic virtio support for Xen guests (frontend side)

* tag 'for-linus-5.19a-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: unexport __init-annotated xen_xlate_map_ballooned_pages()
  arm/xen: Assign xen-grant DMA ops for xen-grant DMA devices
  xen/grant-dma-ops: Retrieve the ID of backend's domain for DT devices
  xen/grant-dma-iommu: Introduce stub IOMMU driver
  dt-bindings: Add xen,grant-dma IOMMU description for xen-grant DMA ops
  xen/virtio: Enable restricted memory access using Xen grant mappings
  xen/grant-dma-ops: Add option to restrict memory access under Xen
  xen/grants: support allocating consecutive grants
  arm/xen: Introduce xen_setup_dma_ops()
  virtio: replace arch_has_restricted_virtio_memory_access()
  kernel: add platform_has() infrastructure