These scripts can be used to test Mirage unikernels on Qubes. They provide a secure way to transfer the image to dom0 and run it. Hopefully.
qubes-manager to create a new AppVM called
You can make it standalone or not and use any template (it doesn't matter
because unikernels already contain all their code and don't need to use a disk
Next, still in dom0, create a new
mirage-test kernel, with an empty
vmlinuz and a compressed empty file for the initramfs, and then set that as the kernel for the new VM:
# mkdir /var/lib/qubes/vm-kernels/mirage-test # cd /var/lib/qubes/vm-kernels/mirage-test # touch modules.img # touch vmlinuz # cat /dev/null | gzip > initramfs # touch test-mirage-ok # qvm-prefs -s mirage-test kernel mirage-test
Only kernels with a
test-mirage-ok file can be updated using this program.
Build the test-mirage binaries:
The default make target uses Docker to build statically-linking binaries, which ensures
they will work with the version of Fedora in dom0. You can also use
make local to build
without Docker, but you'll need to use a compatible version of glibc in that case.
This will generate two binaries in the
dom0.exewill run in dom0 and accepts kernel uploads.
dev.exewill run in your dev VM and sends kernel images to dom0.
dom0.exe to dom0 as
/usr/local/bin/test-mirage-dom0 (and make it executable).
The easiest way to do this is to run these commands in dom0 (
dev is the name of the build VM
and you'll need to adjust the path):
# qvm-run -p dev 'cat /path/to/test-mirage/_build/default/dom0.exe' > dom0.exe # mv dom0.exe /usr/local/bin/test-mirage-dom0 # chmod a+x /usr/local/bin/test-mirage-dom0
/etc/qubes-rpc/talex5.TestMirage containing just that path:
# echo /usr/local/bin/test-mirage-dom0 > /etc/qubes-rpc/talex5.TestMirage
Create a policy allowing your
dev VM to use the service, as
# cat > /etc/qubes-rpc/policy/talex5.TestMirage << EOF dev dom0 allow \$anyvm \$anyvm deny EOF
The policy says that
dev (your dev VM) can use the
talex5.TestMirage service in
Then you can test any Mirage image with the
test-mirage script, e.g.
$ /path/to/test-mirage/test-mirage mir-console.xen mirage-test Waiting for 'Ready'... OK Uploading 'mir-console.xen' (4184144 bytes) to "mirage-test" Waiting for 'Booting'... OK ERROR: VM already stopped! --> Creating volatile image: /var/lib/qubes/appvms/mirage-test/volatile.img... --> Loading the VM (type = AppVM)... --> Starting Qubes DB... --> Setting Qubes DB info for the VM... --> Updating firewall rules... --> Starting the VM... MirageOS booting... Initialising timer interface Initialising console ... done. hello world ...
ERROR: VM already stopped! line is because it tries to stop any existing VM first, and this gets printed if it isn't already running.
Once started, the test VM console is attached using
sudo xl console -c, with stdin and stdout connected to the process in your dev VM.
I am assuming that this command does not provide a way to escape from the VM by entering some special character sequence (the usual
Ctrl-] does not work since this is not a tty, and would just end the process in any case).
Note: Your unikernel should implement the qrexec protocol so that Qubes can control it with
qvm-run. See qubes-mirage-skeleton for an example unikernel that does this. Alternatively, you can configure with
mirage configure -t qubes to have this set up automatically.
Copyright (c) 2015, Thomas Leonard All rights reserved.
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