spread: add device backend configuration support to QEMU #168
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Adds the `device-backends` configuration option, which allows the user to specify which backends for specific devices the system should use. This has no effect on its own, as the implementation is system backend specific. Signed-off-by: Isaac True <isaac.true@canonical.com>
This allows the user to specify which backend should be used for
the disk and network devices. Currently, only the "network" and "disk"
devices are able to be specified. If they are not specified, QEMU will
use the default backends ("e1000" and "none", respectively).
An example of the usage of this could be setting the disk backend to be
"virtio", and the network backend to be "virtio-net-pci":
backends:
qemu:
systems:
- ubuntu-16.04:
device-backends:
disk: virtio
network: virtio-net-pci
The configuration values are passed verbatim to the QEMU instance,
without checking if the values are supported by QEMU, allowing the
flexibility for the user to chose arbitrary backends.
In the case of the disk backend, the argument will be passed as the
value for the `if=` parameter of the `-drive` argument. For the network
device backend, the value will be passed as the value of the `driver=`
parameter of the `-device` argument.
Signed-off-by: Isaac True <isaac.true@canonical.com>
|
This is the more generic implementation of my previous PR #167 |
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This adds the
device-backendsconfiguration option, which allows the user to specify which backends for specific devices the system should use. This has no effect on its own, as the implementation is system backend specific; only the QEMU backend has been enabled with this functionality.For the QEMU backend, this allows the user to specify which backend should be used for the disk and network devices. Currently, only the "network" and "disk" devices are able to be specified. If they are not specified, QEMU will use the default backends ("e1000" and "none", respectively).
This is useful for testing images with stripped-down kernels which do not provide drivers for the default network and storage backends, and only support other drivers (for example only virtio).