On Qubes 4.0, I get intermittent bugs when using qvm-prefs.
One example:
[user@dom0 ~]$ qvm-prefs sys-whonix netvm
sys-firewall
[user@dom0 ~]$ qvm-prefs sys-whonix netvm ""
usage: qvm-prefs [-h] [--verbose] [--quiet] [--help-properties] [--get]
[--set] [--default]
VMNAME [PROPERTY] [VALUE]
qvm-prefs: error: no such property: 'netvm'
[user@dom0 ~]$ qvm-prefs sys-whonix netvm sys-firewall
usage: qvm-prefs [-h] [--verbose] [--quiet] [--help-properties] [--get]
[--set] [--default]
VMNAME [PROPERTY] [VALUE]
qvm-prefs: error: no such property: 'netvm'
[user@dom0 ~]$
Rebooting fixed it.
Another example:
[user@dom0 ~]$ qvm-prefs sys-firewall netvm ""
xenstored started taking 100% CPU in dom0, and qubes that connect to
sys-firewall couldn't start:
[user@dom0 ~]$ qvm-create testvm --label red
[user@dom0 ~]$ qvm-prefs testvm netvm sys-firewall
[user@dom0 ~]$ qvm-start testvm
Start failed: internal error: libxenlight failed to create new domain 'testvm',
see /var/log/libvirt/libxl/libxl-driver.log for details
Relevant log entries:
2018-04-18 01:40:58.186+0000: libxl:
libxl_device.c:1081:device_backend_callback: unable to add device with path
/local/domain/5/backend/vif/7/0
2018-04-18 01:40:58.186+0000: libxl:
libxl_create.c:1512:domcreate_attach_devices: unable to add nic devices
2018-04-18 01:41:08.290+0000: libxl:
libxl_device.c:1081:device_backend_callback: unable to remove device with path
/local/domain/5/backend/vif/7/0
2018-04-18 01:41:08.304+0000: libxl: libxl.c:1669:devices_destroy_cb:
libxl__devices_destroy failed for 7
To fix this, I had to kill sys-firewall (couldn't shut it down), and restart it.
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