Hi all,
This series adds a python framework aiming to provide some ways to do fault
injection in a running vm. In its current state, it allows to easily interact
with memory, change gpios and qom properties.
The framework consists in a python script based on the qmp existing module
which allows to interact with the vm.
The series introduces a QMP command to schedule some virtual-clock-time-based
notifications. The notification is sent back to the python framework and can
be used to build time-driven fault scenario.
Additionaly the series adds some new QMP commands:
Commands are added to read/write memory or memory-mapped registers. Arguments
are similar to the existing [p]memsave commands.
A command is added to set a value to a qdev gpio.
Here's is a simple visual example which inject characters on the uart output
of the zynq platform:
$ # qemu must have been launched with -qmp unix:/tmp/qmpsock,server
$ # create the python framework object
$ import fault_injection
$ inj = fault_injection.FaultInjectionFramework("/tmp/qmpsock", 0)
$
$ # function which display a 'X' to the first uart
$ # it access directly the register using the physical address
$ def cb():
$ inj.write_pmem(0xe0000030,4, 88)
$
$ # schedule the function on a notification in 10s
$ inj.notify(10 * 1000 * 1000 * 1000, cb, True)
$
$ # handle one notification
$ inj.run_once()
The framework has been tested using python 2, on qemu running xilinx_zynq or
virt arm machines.
The series is organised as follows. Patches 1 and 2 adds the memory qmp and
gpio commands. Patch 3 adds the notification mechanism. Patches 4 and 5 add
a python helper module and some documention.
Thanks to the Xilinx's QEMU team who sponsored this work.
Damien Hedde (5):
introduce [p]mem(read|write) qmp commands
introduce a qmp command to set gpios
add qmp time-notify event triggering system
fault_injection: introduce Python scripting framework
docs: add fault injection framework documentation
cpus.c | 126 +++++++++++++++
docs/fault_injection.txt | 149 ++++++++++++++++++
monitor/Makefile.objs | 1 +
monitor/qmp-cmd-time-notify.c | 116 ++++++++++++++
monitor/qmp-cmds.c | 30 ++++
monitor/trace-events | 4 +
qapi/misc.json | 196 +++++++++++++++++++++++
scripts/qmp/fault_injection.py | 278 +++++++++++++++++++++++++++++++++
8 files changed, 900 insertions(+)
create mode 100644 docs/fault_injection.txt
create mode 100644 monitor/qmp-cmd-time-notify.c
create mode 100644 scripts/qmp/fault_injection.py
--
2.22.0
