v2023.05: Merge branch '2023-04-25-use-bounce-buffers-for-VIRTIO_F_IOMMU_PLATFORM'
To quote the author: These patches will use bounce buffers when VIRTIO_F_IOMMU_PLATFORM feature is in a virtio device. This feature can be tested with qemu with -device virtio-iommu-pci. So that when a -device virtio-blk-pci with iommu_platform=true, it will uses the bounce buffer instead.