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[libvirt] [test-API][PATCH] Add cpu hotplug test case



Test hotplug domain CPU, loop increase cpu to max then decrease
to min. Now qemu did not support decrease plug of cpu, so decrease
part will fail, leave it in the case to keep integrity.

Signed-off-by: Wayne Sun <gsun redhat com>
---
 cases/cpu_hotplug.conf      |   38 +++++++
 repos/domain/cpu_hotplug.py |  257 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 295 insertions(+), 0 deletions(-)
 create mode 100644 cases/cpu_hotplug.conf
 create mode 100644 repos/domain/cpu_hotplug.py

diff --git a/cases/cpu_hotplug.conf b/cases/cpu_hotplug.conf
new file mode 100644
index 0000000..7ac0612
--- /dev/null
+++ b/cases/cpu_hotplug.conf
@@ -0,0 +1,38 @@
+domain:install_linux_cdrom
+    guestname
+        $defaultname
+    guestos
+        $defaultos
+    guestarch
+        $defaultarch
+    vcpu
+        $defaultvcpu
+    memory
+        $defaultmem
+    hddriver
+        $defaulthd
+    nicdriver
+        $defaultnic
+    macaddr
+        54:52:00:45:c3:8a
+
+domain:cpu_hotplug
+    guestname
+        $defaultname
+    vcpu
+        4
+    username
+        $username
+    password
+        $password
+
+domain:destroy
+    guestname
+        $defaultname
+
+domain:undefine
+    guestname
+        $defaultname
+
+options cleanup=enable
+
diff --git a/repos/domain/cpu_hotplug.py b/repos/domain/cpu_hotplug.py
new file mode 100644
index 0000000..3626db7
--- /dev/null
+++ b/repos/domain/cpu_hotplug.py
@@ -0,0 +1,257 @@
+#!/usr/bin/env python
+# Test hotplug domain CPU, loop increase cpu to max then decrease
+# to min
+
+import time
+import commands
+from xml.dom import minidom
+
+import libvirt
+from libvirt import libvirtError
+
+from src import sharedmod
+from utils import utils
+
+required_params = ('guestname', 'vcpu', 'username', 'password')
+optional_params = {}
+
+def check_domain_running(conn, guestname):
+    """ check if the domain exists, may or may not be active """
+    guest_names = []
+    ids = conn.listDomainsID()
+    for id in ids:
+        obj = conn.lookupByID(id)
+        guest_names.append(obj.name())
+
+    if guestname not in guest_names:
+        logger.error("%s doesn't exist or not running" % guestname)
+        return 1
+    else:
+        return 0
+
+def redefine_vcpu_number(domobj, guestname, vcpu):
+    """dump domain xml description to change the vcpu number,
+       then, define the domain again
+    """
+    guestxml = domobj.XMLDesc(0)
+    logger.debug('''original guest %s xml :\n%s''' %(guestname, guestxml))
+
+    doc = minidom.parseString(guestxml)
+
+    newvcpu = doc.createElement('vcpu')
+    newvcpuval = doc.createTextNode(str(vcpu))
+    newvcpu.appendChild(newvcpuval)
+    newvcpu.setAttribute('current', '1')
+
+    domain = doc.getElementsByTagName('domain')[0]
+    oldvcpu = doc.getElementsByTagName('vcpu')[0]
+
+    domain.replaceChild(newvcpu, oldvcpu)
+
+    return doc.toxml()
+
+def check_current_vcpu(domobj, username, password):
+    """dump domain xml description to get current vcpu number
+    """
+    guestxml = domobj.XMLDesc(1)
+    logger.debug("domain %s xml is :\n%s" %(domobj.name(), guestxml))
+
+    xml = minidom.parseString(guestxml)
+    vcpu = xml.getElementsByTagName('vcpu')[0]
+    if vcpu.hasAttribute('current'):
+        attr = vcpu.getAttributeNode('current')
+        current_vcpu = int(attr.nodeValue)
+    else:
+        logger.info("domain did not have 'current' attribute in vcpu element")
+        current_vcpu = int(vcpu.childNodes[0].data)
+
+    logger.info("check cpu number in domain")
+    ip = utils.mac_to_ip(mac, 180)
+
+    cmd = "cat /proc/cpuinfo | grep processor | wc -l"
+    ret, output = utils.remote_exec_pexpect(ip, username, password, cmd)
+    if not ret:
+        logger.info("cpu number in domain is %s" % output)
+        if int(output) == current_vcpu:
+            logger.info("cpu number in domain is equal to current vcpu value")
+            return current_vcpu
+        else:
+            logger.error("current vcpu is not equal as check in domain")
+            return False
+    else:
+        logger.error("check in domain fail")
+        return False
+
+
+def set_vcpus(domobj, guestname, vcpu, username, password):
+    """set the value of virtual machine to vcpu offline , then boot up
+       the virtual machine
+    """
+    timeout = 60
+    logger.info('destroy domain')
+
+    try:
+        domobj.destroy()
+    except libvirtError, e:
+        logger.error("API error message: %s, error code is %s" \
+                    % (e.message, e.get_error_code()))
+        logger.error("fail to destroy domain")
+        return 1
+
+    newguestxml = redefine_vcpu_number(domobj, guestname, vcpu)
+    logger.debug('''new guest %s xml :\n%s''' %(guestname, newguestxml))
+
+    logger.info("undefine the original guest")
+    try:
+        domobj.undefine()
+    except libvirtError, e:
+        logger.error("API error message: %s, error code is %s" \
+                     % (e.message, e.get_error_code()))
+        logger.error("fail to undefine guest %" % guestname)
+        return 1
+
+    logger.info("define guest with new xml")
+    try:
+        conn = domobj._conn
+        conn.defineXML(newguestxml)
+    except libvirtError, e:
+        logger.error("API error message: %s, error code is %s" \
+                     % (e.message, e.get_error_code()))
+        logger.error("fail to define guest %s" % guestname)
+        return 1
+
+    try:
+        logger.info('boot guest up ...')
+        domobj.create()
+    except libvirtError, e:
+        logger.error("API error message: %s, error code is %s" \
+                     % (e.message, e.get_error_code()))
+        logger.error("fail to start domain %s" % guestname)
+        return 1
+
+    timeout = 600
+
+    while timeout:
+        time.sleep(10)
+        timeout -= 10
+
+        logger.debug("get ip by mac address")
+        ip = utils.mac_to_ip(mac, 180)
+        logger.debug("the ip address of vm %s is %s" % (guestname, ip))
+
+        if not ip:
+            logger.info(str(timeout) + "s left")
+        else:
+            logger.info("vm %s power on successfully" % guestname)
+            logger.info("the ip address of vm %s is %s" % (guestname, ip))
+            break
+
+    if timeout <= 0:
+        logger.info("fail to power on vm %s" % guestname)
+        return 1
+
+    ret = check_current_vcpu(domobj, username, password)
+    if ret != 'False':
+        return 0
+    else:
+        return 1
+
+    return 0
+
+def cpu_hotplug(params):
+    """set vcpu of virtual machine to value of parameter vcpu and
+       current cpu as 1, then loop set runnning domain vcpu from
+       min to max and loop hotplug it to min
+    """
+    global logger
+    logger = params['logger']
+    params.pop('logger')
+    guestname = params['guestname']
+    vcpu = int(params['vcpu'])
+    username = params['username']
+    password = params['password']
+
+    logger.info("the name of virtual machine is %s" % guestname)
+    logger.info("the vcpu given is %s" % vcpu)
+    if not vcpu > 1:
+        logger.error("vcpu number should bigger than 1")
+        return 1
+
+    conn = sharedmod.libvirtobj['conn']
+
+    try:
+        max_vcpus = int(conn.getMaxVcpus('kvm'))
+        logger.debug("hypervisor supported max vcpu is %s" % max_vcpus)
+    except libvirtError, e:
+        logger.error("libvirt call failed: " + str(e))
+        return 1
+
+    if vcpu > max_vcpus:
+        logger.error("the given vcpu %s is bigger than hypervisor supported" %
+                     vcpu)
+        return 1
+
+    ret = check_domain_running(conn, guestname)
+    if ret:
+        return 1
+
+    logger.debug("get the mac address of vm %s" % guestname)
+    global mac
+    mac = utils.get_dom_mac_addr(guestname)
+    logger.debug("the mac address of vm %s is %s" % (guestname, mac))
+
+    domobj = conn.lookupByName(guestname)
+
+    logger.info("set domain vcpu to %s and restart with current cpu as 1" %
+                    vcpu)
+    ret = set_vcpus(domobj, guestname, vcpu, username, password)
+    if ret != 0:
+        return 1
+
+    try:
+        max = domobj.maxVcpus()
+        logger.info("max vcpu of domain %s is %s" % (guestname, max))
+    except libvirtError, e:
+        logger.error("libvirt call failed: " + str(e))
+        return 1
+
+    logger.info("loop increasing domain %s vcpu count to max" % guestname)
+    for i in range(max):
+        i += 1
+        try:
+            domobj.setVcpus(i)
+            logger.info("set vcpus to %s" % i)
+        except libvirtError, e:
+            logger.error("libvirt call failed: " + str(e))
+            return 1
+
+        time.sleep(5)
+
+        ret = check_current_vcpu(domobj, username, password)
+        if ret == i:
+            logger.info("current vcpu number is %s and equal to set" % ret)
+        else:
+            logger.error("set current vcpu failed")
+            return 1
+
+    logger.info("loop decreasing domain %s vcpu count to min" % guestname)
+    for i in reversed(range(max)):
+        if i == 0:
+            break
+        logger.info("set vcpus to %s" % i)
+        try:
+            max = domobj.setVcpus(i)
+        except libvirtError, e:
+            logger.error("libvirt call failed: " + str(e))
+            return 1
+
+        time.sleep(5)
+
+        ret = check_current_vcpu(domobj, username, password)
+        if ret == i:
+            logger.info("current vcpu number is %s and equal to set" % ret)
+        else:
+            logger.error("set current vcpu failed")
+            return 1
+
+    return 0
-- 
1.7.1


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