Only a running VM counted as active, so a paused one (or one blocked,
PM-suspended or shutting down) had its maximum and current memory written
for the next boot and nothing applied live. Every active VM now has its
current memory changed live and in its definition and keeps its maximum;
a paused guest takes the new size once resumed. The quota check follows
the same rule. Checked on a real guest: paused, shrunk, resumed, then
grown back.
New live guest tests compare what the guest agent reports (online vCPUs,
memory blocks, disk serials and buses, NIC MACs) with the persistent
definition, through the web views:
- at boot, with a data disk;
- after force off, CPU and memory resize and power on (2 vCPUs, 3 GiB);
- a hotplugged disk at once; a bus and serial change after powercycle;
- a NIC MAC change after powercycle, not before;
- a clone boots with its own MAC and disk copy;
- reverting a running snapshot removes a NIC added after it, in the
guest and in the definition, and leaves the VM running;
- a suspended guest does not answer and answers again after resume.
Every request in these tests must redirect (302), so a failing view is
not mistaken for a no-op. Only NICs with QEMU's 52:54: prefix are
compared, as a guest may create its own interfaces. All 13 guest tests
pass against a Rocky Linux 9 guest.
The live tests so far ran VMs without an OS, so everything that needs the
guest's cooperation was untested. With TEST_LIBVIRT_GUEST_IMAGE set to an
installed Linux image with qemu-guest-agent, instances/test_live_guest.py
boots wvc-test VMs from qcow2 overlays of it (the image is only read) and
checks through the web views:
- delete_vol on a running VM: the guest releases the disk, so it leaves
the live and persistent definitions and the volume is deleted;
- detach_vol removes the disk from the running guest and keeps the volume;
- add_network/delete_network: the guest sees the hotplugged NIC, and the
unplug completes in both definitions;
- set_vcpu brings a hotplugged vCPU online in the guest;
- osinfo returns the guest agent's OS, time zone and host name, and the
agent reports the VM's NIC by MAC;
- poweroff shuts the guest down through libvirt.
The image must be a BIOS-bootable qcow2 volume in a storage pool other
than wvc-test; the tests are skipped while a running VM uses it. They pass
against a Rocky Linux 9 guest on a RHEL qemu-kvm host; the guest had no
address on the NAT network (its network configuration is static), so only
the agent's NIC report is checked, not an address.
