QemuUtil lib change to work with ubuntu and centos

[csit.git] / resources / libraries / python / QemuUtils.py

diff --git a/resources/libraries/python/QemuUtils.py b/resources/libraries/python/QemuUtils.py
index bc85435..acc00de 100644 (file)
--- a/resources/libraries/python/QemuUtils.py
+++ b/resources/libraries/python/QemuUtils.py
@@ -15,11 +15,10 @@
 
 from time import time, sleep
 import json
 
 from time import time, sleep
 import json

-import re

 
 from robot.api import logger
 
 
 from robot.api import logger
 

-from resources.libraries.python.ssh import SSH
+from resources.libraries.python.ssh import SSH, SSHTimeout

 from resources.libraries.python.constants import Constants
 from resources.libraries.python.topology import NodeType
 
 from resources.libraries.python.constants import Constants
 from resources.libraries.python.topology import NodeType
 


@@ -27,7 +26,7 @@ from resources.libraries.python.topology import NodeType
 class QemuUtils(object):
     """QEMU utilities."""
 
 class QemuUtils(object):
     """QEMU utilities."""
 

-    __QEMU_BIN = '/opt/qemu/bin/qemu-system-x86_64'
+    __QEMU_BIN = '/usr/bin/qemu-system-x86_64'

     # QEMU Machine Protocol socket
     __QMP_SOCK = '/tmp/qmp.sock'
     # QEMU Guest Agent socket
     # QEMU Machine Protocol socket
     __QMP_SOCK = '/tmp/qmp.sock'
     # QEMU Guest Agent socket


@@ -40,7 +39,7 @@ class QemuUtils(object):
         # Daemonize the QEMU process after initialization. Default one
         # management interface.
         self._qemu_opt['options'] = '-cpu host -daemonize -enable-kvm ' \
         # Daemonize the QEMU process after initialization. Default one
         # management interface.
         self._qemu_opt['options'] = '-cpu host -daemonize -enable-kvm ' \

-            '-machine pc-1.0,accel=kvm,usb=off,mem-merge=off ' \
+            '-machine pc,accel=kvm,usb=off,mem-merge=off ' \

             '-net nic,macaddr=52:54:00:00:02:01 -balloon none'
         self._qemu_opt['ssh_fwd_port'] = 10022
         # Default serial console port
             '-net nic,macaddr=52:54:00:00:02:01 -balloon none'
         self._qemu_opt['ssh_fwd_port'] = 10022
         # Default serial console port


@@ -61,6 +60,8 @@ class QemuUtils(object):
             'password': 'cisco',
             'interfaces': {},
         }
             'password': 'cisco',
             'interfaces': {},
         }

+        # Virtio queue count
+        self._qemu_opt['queues'] = 1

         self._vhost_id = 0
         self._ssh = None
         self._node = None
         self._vhost_id = 0
         self._ssh = None
         self._node = None


@@ -141,14 +142,29 @@ class QemuUtils(object):
             raise ValueError('Host CPU count must match Qemu Thread count')
 
         for qemu_cpu, host_cpu in zip(qemu_cpus, host_cpus):
             raise ValueError('Host CPU count must match Qemu Thread count')
 
         for qemu_cpu, host_cpu in zip(qemu_cpus, host_cpus):

-            cmd = 'taskset -p {0} {1}'.format(hex(1 << int(host_cpu)),
-                                              qemu_cpu['thread_id'])
+            cmd = 'taskset -pc {0} {1}'.format(host_cpu, qemu_cpu['thread_id'])

             (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
             if int(ret_code) != 0:
                 logger.debug('Set affinity failed {0}'.format(stderr))
                 raise RuntimeError('Set affinity failed on {0}'.format(
                     self._node['host']))
 
             (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
             if int(ret_code) != 0:
                 logger.debug('Set affinity failed {0}'.format(stderr))
                 raise RuntimeError('Set affinity failed on {0}'.format(
                     self._node['host']))
 

+    def qemu_set_scheduler_policy(self):
+        """Set scheduler policy to SCHED_RR with priority 1 for all Qemu CPU
+        processes.
+
+       :raises RuntimeError: Set scheduler policy failed.
+        """
+        qemu_cpus = self._qemu_qmp_exec('query-cpus')['return']
+
+        for qemu_cpu in qemu_cpus:
+            cmd = 'chrt -r -p 1 {0}'.format(qemu_cpu['thread_id'])
+            (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
+            if int(ret_code) != 0:
+                logger.debug('Set SCHED_RR failed {0}'.format(stderr))
+                raise RuntimeError('Set SCHED_RR failed on {0}'.format(
+                    self._node['host']))
+

     def qemu_set_node(self, node):
         """Set node to run QEMU on.
 
     def qemu_set_node(self, node):
         """Set node to run QEMU on.
 


@@ -179,15 +195,15 @@ class QemuUtils(object):
             chardev += ',server'
         self._qemu_opt['options'] += chardev
         # Create Vhost-user network backend.
             chardev += ',server'
         self._qemu_opt['options'] += chardev
         # Create Vhost-user network backend.

-        netdev = ' -netdev vhost-user,id=vhost{0},chardev=char{0}'.format(
-            self._vhost_id)
+        netdev = ' -netdev vhost-user,id=vhost{0},chardev=char{0},'\
+            'queues={1}'.format(self._vhost_id, self._qemu_opt['queues'])

         self._qemu_opt['options'] += netdev
         # If MAC is not specified use autogenerated 52:54:00:00:04:<vhost_id>
         # e.g. vhost1 MAC is 52:54:00:00:04:01
         if mac is None:
             mac = '52:54:00:00:04:{0:02x}'.format(self._vhost_id)
         self._qemu_opt['options'] += netdev
         # If MAC is not specified use autogenerated 52:54:00:00:04:<vhost_id>
         # e.g. vhost1 MAC is 52:54:00:00:04:01
         if mac is None:
             mac = '52:54:00:00:04:{0:02x}'.format(self._vhost_id)

-        extend_options = 'csum=off,gso=off,guest_tso4=off,guest_tso6=off,'\
-            'guest_ecn=off,mrg_rxbuf=off'
+        extend_options = 'mq=on,csum=off,gso=off,guest_tso4=off,'\
+            'guest_tso6=off,guest_ecn=off,mrg_rxbuf=off'

         # Create Virtio network device.
         device = ' -device virtio-net-pci,netdev=vhost{0},mac={1},{2}'.format(
             self._vhost_id, mac, extend_options)
         # Create Virtio network device.
         device = ' -device virtio-net-pci,netdev=vhost{0},mac={1},{2}'.format(
             self._vhost_id, mac, extend_options)


@@ -211,14 +227,15 @@ class QemuUtils(object):
             response will contain the "error" keyword instead of "return".
         """
         # To enter command mode, the qmp_capabilities command must be issued.
             response will contain the "error" keyword instead of "return".
         """
         # To enter command mode, the qmp_capabilities command must be issued.

-        qmp_cmd = 'echo "{ \\"execute\\": \\"qmp_capabilities\\" }' + \
-            '{ \\"execute\\": \\"' + cmd + '\\" }" | sudo -S nc -U ' + \
-            self.__QMP_SOCK
+        qmp_cmd = 'echo "{ \\"execute\\": \\"qmp_capabilities\\" }' \
+                  '{ \\"execute\\": \\"' + cmd + \
+                  '\\" }" | sudo -S socat - UNIX-CONNECT:' + self.__QMP_SOCK
+

         (ret_code, stdout, stderr) = self._ssh.exec_command(qmp_cmd)
         (ret_code, stdout, stderr) = self._ssh.exec_command(qmp_cmd)

-        if 0 != int(ret_code):
+        if int(ret_code) != 0:

             logger.debug('QMP execute failed {0}'.format(stderr))
             logger.debug('QMP execute failed {0}'.format(stderr))

-            raise RuntimeError('QMP execute "{0}" failed on {1}'.format(cmd,
-                self._node['host']))
+            raise RuntimeError('QMP execute "{0}"'
+                               ' failed on {1}'.format(cmd, self._node['host']))

         logger.trace(stdout)
         # Skip capabilities negotiation messages.
         out_list = stdout.splitlines()
         logger.trace(stdout)
         # Skip capabilities negotiation messages.
         out_list = stdout.splitlines()


@@ -230,13 +247,15 @@ class QemuUtils(object):
     def _qemu_qga_flush(self):
         """Flush the QGA parser state
         """
     def _qemu_qga_flush(self):
         """Flush the QGA parser state
         """

-        qga_cmd = 'printf "\xFF" | sudo -S nc ' \
-            '-q 1 -U ' + self.__QGA_SOCK
+        qga_cmd = '(printf "\xFF"; sleep 1) | sudo -S socat - UNIX-CONNECT:' + \
+                  self.__QGA_SOCK
+        #TODO: probably need something else

         (ret_code, stdout, stderr) = self._ssh.exec_command(qga_cmd)
         (ret_code, stdout, stderr) = self._ssh.exec_command(qga_cmd)

-        if 0 != int(ret_code):
+        if int(ret_code) != 0:

             logger.debug('QGA execute failed {0}'.format(stderr))
             logger.debug('QGA execute failed {0}'.format(stderr))

-            raise RuntimeError('QGA execute "{0}" failed on {1}'.format(cmd,
-                self._node['host']))
+            raise RuntimeError('QGA execute "{0}" '
+                               'failed on {1}'.format(qga_cmd,
+                                                      self._node['host']))

         logger.trace(stdout)
         if not stdout:
             return {}
         logger.trace(stdout)
         if not stdout:
             return {}


@@ -250,33 +269,38 @@ class QemuUtils(object):
         :param cmd: QGA command to execute.
         :type cmd: str
         """
         :param cmd: QGA command to execute.
         :type cmd: str
         """

-        qga_cmd = 'echo "{ \\"execute\\": \\"' + cmd + '\\" }" | sudo -S nc ' \
-            '-q 1 -U ' + self.__QGA_SOCK
+        qga_cmd = '(echo "{ \\"execute\\": \\"' + \
+                  cmd + \
+                  '\\" }"; sleep 1) | sudo -S socat - UNIX-CONNECT:' + \
+                  self.__QGA_SOCK

         (ret_code, stdout, stderr) = self._ssh.exec_command(qga_cmd)
         (ret_code, stdout, stderr) = self._ssh.exec_command(qga_cmd)

-        if 0 != int(ret_code):
+        if int(ret_code) != 0:

             logger.debug('QGA execute failed {0}'.format(stderr))
             logger.debug('QGA execute failed {0}'.format(stderr))

-            raise RuntimeError('QGA execute "{0}" failed on {1}'.format(cmd,
-                self._node['host']))
+            raise RuntimeError('QGA execute "{0}"'
+                               ' failed on {1}'.format(cmd, self._node['host']))

         logger.trace(stdout)
         if not stdout:
             return {}
         return json.loads(stdout.split('\n', 1)[0])
 
         logger.trace(stdout)
         if not stdout:
             return {}
         return json.loads(stdout.split('\n', 1)[0])
 

-    def _wait_until_vm_boot(self, timeout=300):
+    def _wait_until_vm_boot(self, timeout=60):

         """Wait until QEMU VM is booted.
 
         Ping QEMU guest agent each 5s until VM booted or timeout.
 
         """Wait until QEMU VM is booted.
 
         Ping QEMU guest agent each 5s until VM booted or timeout.
 

-        :param timeout: Waiting timeout in seconds (optional, default 300s).
+        :param timeout: Waiting timeout in seconds (optional, default 60s).

         :type timeout: int
         """
         start = time()
         :type timeout: int
         """
         start = time()

-        while 1:
+        while True:

             if time() - start > timeout:
                 raise RuntimeError('timeout, VM {0} not booted on {1}'.format(
                     self._qemu_opt['disk_image'], self._node['host']))
             if time() - start > timeout:
                 raise RuntimeError('timeout, VM {0} not booted on {1}'.format(
                     self._qemu_opt['disk_image'], self._node['host']))

-            self._qemu_qga_flush()
-            out = self._qemu_qga_exec('guest-ping')
+            try:
+                self._qemu_qga_flush()
+                out = self._qemu_qga_exec('guest-ping')
+            except ValueError:
+                logger.trace('QGA guest-ping unexpected output {}'.format(out))

             # Empty output - VM not booted yet
             if not out:
                 sleep(5)
             # Empty output - VM not booted yet
             if not out:
                 sleep(5)


@@ -287,8 +311,10 @@ class QemuUtils(object):
             elif out.get('error') is not None:
                 sleep(5)
             else:
             elif out.get('error') is not None:
                 sleep(5)
             else:

-                raise RuntimeError('QGA guest-ping unexpected output {}'.format(
-                    out))
+                # If there is an unexpected output from QGA guest-info, try
+                # again until timeout.
+                logger.trace('QGA guest-ping unexpected output {}'.format(out))
+

         logger.trace('VM {0} booted on {1}'.format(self._qemu_opt['disk_image'],
                                                    self._node['host']))
 
         logger.trace('VM {0} booted on {1}'.format(self._qemu_opt['disk_image'],
                                                    self._node['host']))
 


@@ -321,17 +347,12 @@ class QemuUtils(object):
         """Huge page check."""
         huge_mnt = self._qemu_opt.get('huge_mnt')
         mem_size = self._qemu_opt.get('mem_size')
         """Huge page check."""
         huge_mnt = self._qemu_opt.get('huge_mnt')
         mem_size = self._qemu_opt.get('mem_size')

-        # Check size of free huge pages
-        (_, output, _) = self._ssh.exec_command('grep Huge /proc/meminfo')
-        regex = re.compile(r'HugePages_Free:\s+(\d+)')
-        match = regex.search(output)
-        huge_free = int(match.group(1))
-        regex = re.compile(r'HugePages_Total:\s+(\d+)')
-        match = regex.search(output)
-        huge_total = int(match.group(1))
-        regex = re.compile(r'Hugepagesize:\s+(\d+)')
-        match = regex.search(output)
-        huge_size = int(match.group(1))
+
+        # Get huge pages information
+        huge_size = self._get_huge_page_size()
+        huge_free = self._get_huge_page_free(huge_size)
+        huge_total = self._get_huge_page_total(huge_size)
+

         # Check if memory reqested by qemu is available on host
         if (mem_size * 1024) > (huge_free * huge_size):
             # If we want to allocate hugepage dynamically
         # Check if memory reqested by qemu is available on host
         if (mem_size * 1024) > (huge_free * huge_size):
             # If we want to allocate hugepage dynamically


@@ -353,8 +374,10 @@ class QemuUtils(object):
                         self._node['host']))
             # If we do not want to allocate dynamicaly end with error
             else:
                         self._node['host']))
             # If we do not want to allocate dynamicaly end with error
             else:

-                raise RuntimeError('Not enough free huge pages: {0}, '
-                    '{1} MB'.format(huge_free, huge_free * huge_size))
+                raise RuntimeError(
+                    'Not enough free huge pages: {0}, '
+                    '{1} MB'.format(huge_free, huge_free * huge_size)
+                )

         # Check if huge pages mount point exist
         has_huge_mnt = False
         (_, output, _) = self._ssh.exec_command('cat /proc/mounts')
         # Check if huge pages mount point exist
         has_huge_mnt = False
         (_, output, _) = self._ssh.exec_command('cat /proc/mounts')


@@ -381,6 +404,80 @@ class QemuUtils(object):
                 raise RuntimeError('Mount huge pages failed on {0}'.format(
                     self._node['host']))
 
                 raise RuntimeError('Mount huge pages failed on {0}'.format(
                     self._node['host']))
 

+    def _get_huge_page_size(self):
+        """Get default size of huge pages in system.
+
+        :returns: Default size of free huge pages in system.
+        :rtype: int
+        :raises: RuntimeError if reading failed for three times.
+        """
+        # TODO: remove to dedicated library
+        cmd_huge_size = "grep Hugepagesize /proc/meminfo | awk '{ print $2 }'"
+        for _ in range(3):
+            (ret, out, _) = self._ssh.exec_command_sudo(cmd_huge_size)
+            if ret == 0:
+                try:
+                    huge_size = int(out)
+                except ValueError:
+                    logger.trace('Reading huge page size information failed')
+                else:
+                    break
+        else:
+            raise RuntimeError('Getting huge page size information failed.')
+        return huge_size
+
+    def _get_huge_page_free(self, huge_size):
+        """Get total number of huge pages in system.
+
+        :param huge_size: Size of hugepages.
+        :type huge_size: int
+        :returns: Number of free huge pages in system.
+        :rtype: int
+        :raises: RuntimeError if reading failed for three times.
+        """
+        # TODO: add numa aware option
+        # TODO: remove to dedicated library
+        cmd_huge_free = 'cat /sys/kernel/mm/hugepages/hugepages-{0}kB/'\
+            'free_hugepages'.format(huge_size)
+        for _ in range(3):
+            (ret, out, _) = self._ssh.exec_command_sudo(cmd_huge_free)
+            if ret == 0:
+                try:
+                    huge_free = int(out)
+                except ValueError:
+                    logger.trace('Reading free huge pages information failed')
+                else:
+                    break
+        else:
+            raise RuntimeError('Getting free huge pages information failed.')
+        return huge_free
+
+    def _get_huge_page_total(self, huge_size):
+        """Get total number of huge pages in system.
+
+        :param huge_size: Size of hugepages.
+        :type huge_size: int
+        :returns: Total number of huge pages in system.
+        :rtype: int
+        :raises: RuntimeError if reading failed for three times.
+        """
+        # TODO: add numa aware option
+        # TODO: remove to dedicated library
+        cmd_huge_total = 'cat /sys/kernel/mm/hugepages/hugepages-{0}kB/'\
+            'nr_hugepages'.format(huge_size)
+        for _ in range(3):
+            (ret, out, _) = self._ssh.exec_command_sudo(cmd_huge_total)
+            if ret == 0:
+                try:
+                    huge_total = int(out)
+                except ValueError:
+                    logger.trace('Reading total huge pages information failed')
+                else:
+                    break
+        else:
+            raise RuntimeError('Getting total huge pages information failed.')
+        return huge_total
+

     def qemu_start(self):
         """Start QEMU and wait until VM boot.
 
     def qemu_start(self):
         """Start QEMU and wait until VM boot.
 


@@ -395,28 +492,32 @@ class QemuUtils(object):
         # Memory and huge pages
         mem = '-object memory-backend-file,id=mem,size={0}M,mem-path={1},' \
             'share=on -m {0} -numa node,memdev=mem'.format(
         # Memory and huge pages
         mem = '-object memory-backend-file,id=mem,size={0}M,mem-path={1},' \
             'share=on -m {0} -numa node,memdev=mem'.format(

-            self._qemu_opt.get('mem_size'), self._qemu_opt.get('huge_mnt'))
+                self._qemu_opt.get('mem_size'), self._qemu_opt.get('huge_mnt'))

 
         # By default check only if hugepages are availbale.
         # If 'huge_allocate' is set to true try to allocate as well.
         self._huge_page_check(allocate=self._qemu_opt.get('huge_allocate'))
 
 
         # By default check only if hugepages are availbale.
         # If 'huge_allocate' is set to true try to allocate as well.
         self._huge_page_check(allocate=self._qemu_opt.get('huge_allocate'))
 

+        # Disk option
+        drive = '-drive file={},format=raw,cache=none,if=virtio'.format(
+            self._qemu_opt.get('disk_image'))

         # Setup QMP via unix socket
         qmp = '-qmp unix:{0},server,nowait'.format(self.__QMP_SOCK)
         # Setup serial console
         serial = '-chardev socket,host=127.0.0.1,port={0},id=gnc0,server,' \
             'nowait -device isa-serial,chardev=gnc0'.format(
         # Setup QMP via unix socket
         qmp = '-qmp unix:{0},server,nowait'.format(self.__QMP_SOCK)
         # Setup serial console
         serial = '-chardev socket,host=127.0.0.1,port={0},id=gnc0,server,' \
             'nowait -device isa-serial,chardev=gnc0'.format(

-            self._qemu_opt.get('serial_port'))
+                self._qemu_opt.get('serial_port'))

         # Setup QGA via chardev (unix socket) and isa-serial channel
         qga = '-chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 ' \
             '-device isa-serial,chardev=qga0'
         # Graphic setup
         graphic = '-monitor none -display none -vga none'
         # Setup QGA via chardev (unix socket) and isa-serial channel
         qga = '-chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 ' \
             '-device isa-serial,chardev=qga0'
         # Graphic setup
         graphic = '-monitor none -display none -vga none'

+

         # Run QEMU
         # Run QEMU

-        cmd = '{0} {1} {2} {3} {4} -hda {5} {6} {7} {8} {9}'.format(
+        cmd = '{0} {1} {2} {3} {4} {5} {6} {7} {8} {9}'.format(

             self.__QEMU_BIN, self._qemu_opt.get('smp'), mem, ssh_fwd,
             self._qemu_opt.get('options'),
             self.__QEMU_BIN, self._qemu_opt.get('smp'), mem, ssh_fwd,
             self._qemu_opt.get('options'),

-            self._qemu_opt.get('disk_image'), qmp, serial, qga, graphic)
+            drive, qmp, serial, qga, graphic)

         (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd, timeout=300)
         if int(ret_code) != 0:
             logger.debug('QEMU start failed {0}'.format(stderr))
         (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd, timeout=300)
         if int(ret_code) != 0:
             logger.debug('QEMU start failed {0}'.format(stderr))


@@ -424,7 +525,12 @@ class QemuUtils(object):
                 self._node['host']))
         logger.trace('QEMU running')
         # Wait until VM boot
                 self._node['host']))
         logger.trace('QEMU running')
         # Wait until VM boot

-        self._wait_until_vm_boot()
+        try:
+            self._wait_until_vm_boot()
+        except (RuntimeError, SSHTimeout):
+            self.qemu_kill()
+            self.qemu_clear_socks()
+            raise

         # Update interface names in VM node dict
         self._update_vm_interfaces()
         # Return VM node dict
         # Update interface names in VM node dict
         self._update_vm_interfaces()
         # Return VM node dict


@@ -443,15 +549,18 @@ class QemuUtils(object):
         out = self._qemu_qmp_exec('system_powerdown')
         err = out.get('error')
         if err is not None:
         out = self._qemu_qmp_exec('system_powerdown')
         err = out.get('error')
         if err is not None:

-            raise RuntimeError('QEMU system powerdown failed on {0}, '
-                'error: {1}'.format(self._node['host'], json.dumps(err)))
+            raise RuntimeError(
+                'QEMU system powerdown failed on {0}, '
+                'error: {1}'.format(self._node['host'], json.dumps(err))
+            )

 
     def qemu_system_reset(self):
         """Reset the system."""
         out = self._qemu_qmp_exec('system_reset')
         err = out.get('error')
         if err is not None:
 
     def qemu_system_reset(self):
         """Reset the system."""
         out = self._qemu_qmp_exec('system_reset')
         err = out.get('error')
         if err is not None:

-            raise RuntimeError('QEMU system reset failed on {0}, '
+            raise RuntimeError(
+                'QEMU system reset failed on {0}, '

                 'error: {1}'.format(self._node['host'], json.dumps(err)))
 
     def qemu_kill(self):
                 'error: {1}'.format(self._node['host'], json.dumps(err)))
 
     def qemu_kill(self):


@@ -501,7 +610,8 @@ class QemuUtils(object):
             return ret.get('status')
         else:
             err = out.get('error')
             return ret.get('status')
         else:
             err = out.get('error')

-            raise RuntimeError('QEMU query-status failed on {0}, '
+            raise RuntimeError(
+                'QEMU query-status failed on {0}, '

                 'error: {1}'.format(self._node['host'], json.dumps(err)))
 
     @staticmethod
                 'error: {1}'.format(self._node['host'], json.dumps(err)))
 
     @staticmethod


@@ -518,6 +628,6 @@ class QemuUtils(object):
             ssh.exec_command('sudo -Sn bash {0}/{1}/qemu_build.sh'.format(
                 Constants.REMOTE_FW_DIR, Constants.RESOURCES_LIB_SH), 1000)
         logger.trace(stdout)
             ssh.exec_command('sudo -Sn bash {0}/{1}/qemu_build.sh'.format(
                 Constants.REMOTE_FW_DIR, Constants.RESOURCES_LIB_SH), 1000)
         logger.trace(stdout)

-        if 0 != int(ret_code):
+        if int(ret_code) != 0:

             logger.debug('QEMU build failed {0}'.format(stderr))
             raise RuntimeError('QEMU build failed on {0}'.format(node['host']))
             logger.debug('QEMU build failed {0}'.format(stderr))
             raise RuntimeError('QEMU build failed on {0}'.format(node['host']))