vm_concierge

vm_concierge is a daemon that exposes a D-Bus interface to control lifetime of crosvm. See /vm_tools/README.md for details.

Hacking

For quick iteration on related projects, work on vm_protos for grpc and chromeos-base/system_api for dbus.

cros_workon --board ${BOARD} start chromeos-base/system_api chromeos-base/vm_host_tools chromeos-base/vm_protos

Then it is possible to iterate on vm_concierge.

cros_workon_make --test --board=brya \
  chromeos-base/system_api \
  --install  # If system_api changed.
cros_workon_make --test --board=brya \
  chromeos-base/vm_protos \
  --install  # If vm_protos changed.
cros_workon_make --test --board=brya chromeos-base/vm_host_tools

Obtaining backtrace on crash

Observe the logs on the device. Trigger what you are trying to debug. For inspiration, the following are examples of triggering crash and observing logs.

tail -f /var/log/messages & start vm_concierge; fg
tail -f /var/log/messages & stop vm_concierge; fg
tail -f /var/log/messages & vmc stop termina; fg

Observe the dump log file on your workstation to get a backtrace. Using tast symbolize

scp dut:/var/spool/crash/vm_concierge.20230413.101819.53856.31734.dmp .
tast symbolize vm_concierge.20230413.101819.53856.31734.dmp