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Patching the host kernel is sufficient to block attacks from guests to the host.On the other hand, in order to protect the guest kernel from a malicious userspace, updates are also needed to the guest kernel and, depending on the processor architecture, to QEMU.In a nutshell, these are the steps that you have to take to install a Fedora 27 s390x KVM guest from an ISO image: /Server/s390x/iso/Fedora-Server-dvd-s390x-27-1.6qemu-img create -f qcow2 fedora.qcow2 16G sudo mount -o loop,ro Fedora-Server-dvd-s390x-27-1.6/mnt cp /mnt/images//mnt/images/.sudo umount /mnt qemu-system-s390x -M In recent times I have been aggressively working to expand the coverage of libvirt XML schemas in the libvirt-go-xml project.There are some exceptions to this though, as the simple annotations can’t capture every nuance of many XML documents.For example, integer values are always parsed & formatted in base 10, so extra work is needed for base 16.
This really makes dealing with XML a much more enjoyable experience, because you effectively don’t deal with XML at all!
For example, given the Go structs: Other programming languages I’ve used required a great deal more work when dealing with XML.
For parsing, there’s typically a choice between an XML stream based parser where you have to react to tokens as they’re parsed and stuff them into structs, or a DOM object hierarchy from which you then have to pull data out into your structs.
For those who aren’t familiar with Go, the core library’s module provides a very easy way to consume and produce XML documents in Go code.
You simply define a set of struct types and annotate their fields to indicate what elements & attributes each should map to.
Unfortunately, the start-up scripts of Fedora expect a SCSI DVD drives instead (which should show up as /dev/sr* in the guest), so you only eventually get an “dracut-initqueue timeout” and an emergency shell if you try to boot your guest this way.