Splitting the definitions of a post-launched VM into two files, namely the
scenario XML and launch XML, introduces duplicated field in both files and
leads to a high probability of having inconsistencies between them (see
issue #7156 as an example). Further more, this split has also adds much
complexity to the configurator which has to either hide some of the items
from user interfaces or synchronize different fields upon changes.
The advantage of the split, however, is not widely adopted. Having a
separate XML capturing the VM definition tweakable in the service VM at
runtime seems to give users more flexibility to redefine a VM without
recompiling the hypervisor. But that is not a common practice in the
industry segment; instead it is preferred to have a static scenario
definition to make sure that all resources are allocated carefully in a
fixed manner in order for better determinism.
As a result, this patch merges the fields in launch XMLs into the schema of
scenario XMLs. Some fields are post-launched VM specific and thus added,
while the others have similar items in scenario XMLs today.
The launch script generator is also updated accordingly to generate launch
scripts from the new scenario XMLs (which now contain the same amount of
information as previous launch XMLs).
Tracked-On: #6690
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
The launch script generator today (and the scripts that it generates) is
fundamentally built on the concept of PCI device classes, with the
restriction that at most one PCI function per class can be passed through
to a post-launched VM. This has put inproper constraint on the scenarios
users can set up, especially on server platforms or those with SR-IOV
capable devices.
As it is too tedious to change such deep-rooted concept, this patch
rewrites the launch script generator and refines the structure of the
generated scripts so that PCI functions are identified only by their
BDF.
This change serves as a mandatory step to align the way how passthrough
devices are configured for pre-launched and post-launched VMs, which
eventually allows us to present a unified view in the configurator for
assigning passthrough device.
v2 -> v3:
* Rename sos_id to service_vm_id and user_vmid to user_vm_id.
* Refine a couple of info messages in the launch script template.
v1 -> v2:
* Fix wording issues identified during review.
* Exit when the out_dir is an existing regular file.
Tracked-On: #6690
Signed-off-by: Junjie Mao <junjie.mao@intel.com>
