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vhost does not support RO protections on memory at the moment - adding ROMs would mean that e.g. a buggy guest might change them in-memory - a condition from which guest reset does not recover. Not nice. We also definitely don't want to try logging writes into ROMs - in particular guests set very high addresses for ROM BARs so logging these writes would waste a lot of memory. Maybe ROMs could be supported with the iotlb variant - not sure, but there seems to be no good reason for virtio to try to do DMA from ROM. So let's just skip ROM memory. Suggested-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Laurent Vivier <lvivier@redhat.com> Tested-by: Laurent Vivier <lvivier@redhat.com>