Tests the ability of adding virtual cpus on the fly to qemu using
the monitor command cpu_set, then after everything is OK, run the
cpu_hotplug testsuite on the guest through autotest.
Updates: As of the latest qemu-kvm (08-24-2011) HEAD, trying to
online more CPUs than the ones already available leads to qemu
hanging:
File /home/lmr/Code/autotest-git/client/virt/kvm_monitor.py, line 279, in cmd
raise MonitorProtocolError(msg)
MonitorProtocolError: Could not find (qemu) prompt after command cpu_set 2 online. Output so far: ""
Changes from v2:
* Added stress onlining/offlining CPUs
* Changed variant name
Signed-off-by: Lucas Meneghel Rodrigues <lmr@xxxxxxxxxx>
---
client/tests/kvm/tests/cpu_hotplug.py | 111 ++++++++++++++++++++++++++++++++
client/tests/kvm/tests_base.cfg.sample | 8 ++
2 files changed, 119 insertions(+), 0 deletions(-)
create mode 100644 client/tests/kvm/tests/cpu_hotplug.py
diff --git a/client/tests/kvm/tests/cpu_hotplug.py b/client/tests/kvm/tests/cpu_hotplug.py
new file mode 100644
index 0000000..e4d79f8
--- /dev/null
+++ b/client/tests/kvm/tests/cpu_hotplug.py
@@ -0,0 +1,111 @@
+import os, logging, re
+from autotest_lib.client.common_lib import error
+from autotest_lib.client.virt import virt_test_utils
+
+
+@error.context_aware
+def run_cpu_hotplug(test, params, env):
+ """
+ Runs CPU hotplug test:
+
+ 1) Pick up a living guest
+ 2) Send the monitor command cpu_set [cpu id] for each cpu we wish to have
+ 3) Verify if guest has the additional CPUs showing up under
+ /sys/devices/system/cpu
+ 4) Try to bring them online by writing 1 to the 'online' file inside that dir
+ 5) Run the CPU Hotplug test suite shipped with autotest inside guest
+
+ @param test: KVM test object.
+ @param params: Dictionary with test parameters.
+ @param env: Dictionary with the test environment.
+ """
+ vm = env.get_vm(params["main_vm"])
+ vm.verify_alive()
+ timeout = int(params.get("login_timeout", 360))
+ session = vm.wait_for_login(timeout=timeout)
+
+ n_cpus_add = int(params.get("n_cpus_add", 1))
+ current_cpus = int(params.get("smp", 1))
+ onoff_iterations = int(params.get("onoff_iterations", 20))
+ total_cpus = current_cpus + n_cpus_add
+
+ error.context("getting guest dmesg before addition")
+ dmesg_before = session.cmd("dmesg -c")
+
+ error.context("Adding %d CPUs to guest" % n_cpus_add)
+ for i in range(total_cpus):
+ vm.monitor.cmd("cpu_set %s online" % i)
+
+ output = vm.monitor.cmd("info cpus")
+ logging.debug("Output of info cpus:\n%s", output)
+
+ cpu_regexp = re.compile("CPU #(\d+)")
+ total_cpus_monitor = len(cpu_regexp.findall(output))
+ if total_cpus_monitor != total_cpus:
+ raise error.TestFail("Monitor reports %s CPUs, when VM should have %s" %
+ (total_cpus_monitor, total_cpus))
+
+ dmesg_after = session.cmd("dmesg -c")
+ logging.debug("Guest dmesg output after CPU add:\n%s" % dmesg_after)
+
+ # Verify whether the new cpus are showing up on /sys
+ error.context("verifying if new CPUs are showing on guest's /sys dir")
+ n_cmd = 'find /sys/devices/system/cpu/cpu[0-99] -maxdepth 0 -type d | wc -l'
+ output = session.cmd(n_cmd)
+ logging.debug("List of cpus on /sys:\n%s" % output)
+ try:
+ cpus_after_addition = int(output)
+ except ValueError:
+ logging.error("Output of '%s': %s", n_cmd, output)
+ raise error.TestFail("Unable to get CPU count after CPU addition")
+
+ if cpus_after_addition != total_cpus:
+ raise error.TestFail("%s CPUs are showing up under "
+ "/sys/devices/system/cpu, was expecting %s" %
+ (cpus_after_addition, total_cpus))
+
+ error.context("locating online files for guest's new CPUs")
+ r_cmd = 'find /sys/devices/system/cpu/cpu[1-99]/online -maxdepth 0 -type f'
+ online_files = session.cmd(r_cmd)
+ logging.debug("CPU online files detected: %s", online_files)
+ online_files = online_files.split().sort()
+
+ if not online_files:
+ raise error.TestFail("Could not find CPUs that can be "
+ "enabled/disabled on guest")
+
+ for online_file in online_files:
+ cpu_regexp = re.compile("cpu(\d+)", re.IGNORECASE)
+ cpu_id = cpu_regexp.findall(online_file)[0]
+ error.context("changing online status for CPU %s" % cpu_id)
+ check_online_status = session.cmd("cat %s" % online_file)
+ try:
+ check_online_status = int(check_online_status)
+ except ValueError:
+ raise error.TestFail("Unable to get online status from CPU %s" %
+ cpu_id)
+ assert(check_online_status in [0, 1])
+ if check_online_status == 0:
+ error.context("Bringing CPU %s online" % cpu_id)
+ session.cmd("echo 1 > %s" % online_file)
+
+ # Now that all CPUs were onlined, let's execute the
+ # autotest CPU Hotplug test
+ control_path = os.path.join(test.bindir, "autotest_control",
+ "cpu_hotplug.control")
+
+ timeout = int(params.get("cpu_hotplug_timeout"), 300)
+ error.context("running cpu_hotplug autotest after cpu addition")
+ virt_test_utils.run_autotest(vm, session, control_path, timeout,
+ test.outputdir, params)
+
+ # Last, but not least, let's offline/online the CPUs in the guest
+ # several times
+ irq = 15
+ irq_mask = "f0"
+ for i in xrange(onoff_iterations):
+ session.cmd("echo %s > /proc/irq/%s/smp_affinity" % (irq_mask, irq))
+ for online_file in online_files:
+ session.cmd("echo 0 > %s" % online_file)
+ for online_file in online_files:
+ session.cmd("echo 1 > %s" % online_file)
diff --git a/client/tests/kvm/tests_base.cfg.sample b/client/tests/kvm/tests_base.cfg.sample
index ca8a9c0..3941db0 100644
--- a/client/tests/kvm/tests_base.cfg.sample
+++ b/client/tests/kvm/tests_base.cfg.sample
@@ -1104,6 +1104,14 @@ variants:
dd_timeout = 900
check_cmd_timeout = 900
+ - cpu_hotplug_test:
+ type = cpu_hotplug
+ cpu_hotplug_timeout = 600
+ n_cpus_add = 1
+ kill_vm = yes
+ iterations = 5
+ onoff_iterations = 100
+
# system_powerdown, system_reset and shutdown *must* be the last ones
# defined (in this order), since the effect of such tests can leave
# the VM on a bad state.
--
1.7.6
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