On Wed, Apr 7, 2010 at 8:55 AM, Jason Wang <jasowang@xxxxxxxxxx> wrote:
> The design of iofuzz is simple: it just generate random I/O port
> activity inside the virtual machine. The correctness of the device
> emulation may be verified through this test.
>
> As the instrcutions are randomly generated, guest may enter the wrong
> state. The test solve this issue by detect the hang and restart the
> virtual machine.
>
> The test duration could also be adjusted through the "fuzz_count". And
> the parameter "skip_devices" is used to specified the devices which
> should not be used to do the fuzzing.
>
> For current version, every activity were logged and the commnad was
> sent through a seesion between host and guest. Through this method may
> slow down the whole test but it works well. The enumeration was done
> through /proc/ioports and the scenario of avtivity is not aggressive.
>
> Suggestions are welcomed.
Hi Jason, nice test! I have made some little changes, re-submitted and
will commit. Thanks!
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> client/tests/kvm/tests/iofuzz.py | 97 ++++++++++++++++++++++++++++++++
> client/tests/kvm/tests_base.cfg.sample | 2 +
> 2 files changed, 99 insertions(+), 0 deletions(-)
> create mode 100644 client/tests/kvm/tests/iofuzz.py
>
> diff --git a/client/tests/kvm/tests/iofuzz.py b/client/tests/kvm/tests/iofuzz.py
> new file mode 100644
> index 0000000..c2f22af
> --- /dev/null
> +++ b/client/tests/kvm/tests/iofuzz.py
> @@ -0,0 +1,97 @@
> +import logging, time, re, random
> +from autotest_lib.client.common_lib import error
> +import kvm_subprocess, kvm_test_utils, kvm_utils
> +
> +
> +def run_iofuzz(test, params, env):
> + """
> + KVM iofuzz test:
> + 1) Log into a guest
> +
> + @param test: kvm test object
> + @param params: Dictionary with the test parameters
> + @param env: Dictionary with test environment.
> + """
> + vm = kvm_test_utils.get_living_vm(env, params.get("main_vm"))
> + session = kvm_test_utils.wait_for_login(vm, 0,
> + float(params.get("boot_timeout", 240)),
> + 0, 2)
> +
> + def outb(session, port, data):
> + logging.debug("outb(0x%x,0x%x)" % (port, data))
> + outb_cmd = "echo -e '\\%s' | dd of=/dev/port seek=%d bs=1 count=1" % \
> + (oct(data), port)
> + s, o = session.get_command_status_output(outb_cmd)
> + if s != 0:
> + logging.debug("None zero value returned")
> +
> + def inb(session, port):
> + logging.debug("inb(0x%x)" % port)
> + inb_cmd = "dd if=/dev/port seek=%d of=/dev/null bs=1 count=1" % port
> + s, o = session.get_command_status_output(inb_cmd)
> + if s != 0:
> + logging.debug("None zero value returned")
> +
> + def fuzz(session, inst_list):
> + for (op, operand) in inst_list:
> + if op == "read":
> + inb(session, operand[0])
> + elif op =="write":
> + outb(session, operand[0], operand[1])
> + else:
> + raise error.TestError("Unknown command %s" % op)
> +
> + if not session.is_responsive():
> + logging.debug("Session is not responsive")
> + if vm.process.is_alive():
> + logging.debug("VM is alive, try to re-login")
> + try:
> + session = kvm_test_utils.wait_for_login(vm, 0, 10, 0, 2)
> + except:
> + logging.debug("Could not re-login, reboot the guest")
> + session = kvm_test_utils.reboot(vm, session,
> + method = "system_reset")
> + else:
> + raise error.TestFail("VM have quit abnormally")
> + try:
> + ports = {}
> + ran = random.SystemRandom()
> +
> + logging.info("Enumerate the device through /proc/ioports")
> + ioports = session.get_command_output("cat /proc/ioports")
> + logging.debug(ioports)
> + devices = re.findall("(\w+)-(\w+)\ : (.*)", ioports)
> +
> + skip_devices = params.get("skip_devices","")
> + fuzz_count = int(params.get("fuzz_count", 10))
> +
> + for (beg, end, name) in devices:
> + ports[(int(beg, base=16), int(end, base=16))] = name.strip()
> +
> + for (beg, end) in ports.keys():
> +
> + name = ports[(beg, end)]
> + if name in skip_devices:
> + logging.info("Skipping %s" % name)
> + continue
> +
> + logging.info("Fuzzing %s at 0x%x-0x%x" % (name, beg, end))
> + inst = []
> +
> + # Read all ports
> + for port in range(beg, end+1):
> + inst.append(("read", [port]))
> +
> + # Outb with zero
> + for port in range(beg, end+1):
> + inst.append(("write", [port, 0]))
> + pass
> +
> + # Random fuzzing
> + for seq in range(fuzz_count * (end-beg+1)):
> + inst.append(("write", [ran.randint(beg, end), ran.randint(0,255)]))
> +
> + fuzz(session, inst)
> +
> + finally:
> + session.close()
> diff --git a/client/tests/kvm/tests_base.cfg.sample b/client/tests/kvm/tests_base.cfg.sample
> index d162cf8..01080bb 100644
> --- a/client/tests/kvm/tests_base.cfg.sample
> +++ b/client/tests/kvm/tests_base.cfg.sample
> @@ -294,6 +294,8 @@ variants:
> ksm_mode = "serial"
> - ksm_parallel:
> ksm_mode = "parallel"
> + - iofuzz:
> + type = iofuzz
>
> # system_powerdown, system_reset and shutdown *must* be the last ones
> # defined (in this order), since the effect of such tests can leave
>
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>
--
Lucas
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