Dpdk in VM: Increase num_mbufs
[csit.git] / resources / libraries / python / QemuUtils.py
index 74965ec..682def1 100644 (file)
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2021 Cisco and/or its affiliates.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
 
 """QEMU utilities library."""
 
 
 """QEMU utilities library."""
 
-from time import time, sleep
 import json
 import json
+
 from re import match
 from re import match
-# Disable due to pylint bug
-# pylint: disable=no-name-in-module,import-error
-from distutils.version import StrictVersion
+from string import Template
+from time import sleep
 
 from robot.api import logger
 
 from robot.api import logger
-from resources.libraries.python.ssh import exec_cmd, exec_cmd_no_error
+
 from resources.libraries.python.Constants import Constants
 from resources.libraries.python.Constants import Constants
+from resources.libraries.python.DpdkUtil import DpdkUtil
 from resources.libraries.python.DUTSetup import DUTSetup
 from resources.libraries.python.DUTSetup import DUTSetup
+from resources.libraries.python.OptionString import OptionString
+from resources.libraries.python.ssh import exec_cmd, exec_cmd_no_error
 from resources.libraries.python.topology import NodeType, Topology
 from resources.libraries.python.topology import NodeType, Topology
+from resources.libraries.python.VhostUser import VirtioFeaturesFlags
+from resources.libraries.python.VhostUser import VirtioFeatureMask
+from resources.libraries.python.VppConfigGenerator import VppConfigGenerator
 
 
-__all__ = ["QemuOptions", "QemuUtils"]
+__all__ = [u"QemuUtils"]
 
 
 
 
-class QemuOptions(object):
-    """QEMU option class.
-
-    The class can handle input parameters or parameters that acts as QEMU
-    command line parameters. The only variable is a list of dictionaries
-    where dictionaries can be added multiple times. This emulates the QEMU
-    behavior where one command line parameter can be used multiple times (1..N).
-    Example can be device or object (so it is not an issue to have one memory
-    block of 2G and and second memory block of 512M but from other numa).
-
-    Class does support get value or string representation that will return
-    space separated, dash prefixed string of key value pairs used for command
-    line.
-    """
-
-    # Use one instance of class per tests.
-    ROBOT_LIBRARY_SCOPE = 'TEST CASE'
-
-    def __init__(self):
-        self.variables = list()
-
-    def add(self, variable, value):
-        """Add parameter to the list.
-
-        :param variable: QEMU parameter.
-        :param value: Parameter value.
-        :type variable: str
-        :type value: str or int
-        """
-        self.variables.append({str(variable): value})
-
-    def get(self, variable):
-        """Get parameter of variable(s) from list that matches input value.
-
-        :param variable: QEMU parameter to get.
-        :type variable: str
-        :returns: List of values or value that matches input parameter.
-        :rtype: list or str
-        """
-        selected = [d[variable] for d in self.variables if variable in d]
-        return selected if len(selected) > 1 else selected[0]
-
-    def get_values(self):
-        """Get all values from dict items in list.
-
-        :returns: List of all dictionary values.
-        :rtype: list
-        """
-        return [d.values()[0] for d in self.variables]
-
-    def __str__(self):
-        """Return space separated string of key value pairs.
-
-        :returns: Space separated string of key value pairs.
-        :rtype: str
-        """
-        return " ".join(["-{k} {v}".format(k=d.keys()[0], v=d.values()[0])
-                         for d in self.variables])
-
-class QemuUtils(object):
+class QemuUtils:
     """QEMU utilities."""
 
     # Use one instance of class per tests.
     """QEMU utilities."""
 
     # Use one instance of class per tests.
-    ROBOT_LIBRARY_SCOPE = 'TEST CASE'
+    ROBOT_LIBRARY_SCOPE = u"TEST CASE"
 
 
-    def __init__(self, node=None, qemu_id=1, smp=1, mem=512, vnf=None,
-                 img='/var/lib/vm/vhost-nested.img', bin_path='/usr/bin'):
+    def __init__(
+            self, node, qemu_id=1, smp=1, mem=512, vnf=None,
+            img=Constants.QEMU_VM_IMAGE):
         """Initialize QemuUtil class.
 
         :param node: Node to run QEMU on.
         """Initialize QemuUtil class.
 
         :param node: Node to run QEMU on.
@@ -104,119 +51,419 @@ class QemuUtils(object):
         :param mem: Amount of memory.
         :param vnf: Network function workload.
         :param img: QEMU disk image or kernel image path.
         :param mem: Amount of memory.
         :param vnf: Network function workload.
         :param img: QEMU disk image or kernel image path.
-        :param bin_path: QEMU binary path.
         :type node: dict
         :type qemu_id: int
         :type smp: int
         :type mem: int
         :type vnf: str
         :type img: str
         :type node: dict
         :type qemu_id: int
         :type smp: int
         :type mem: int
         :type vnf: str
         :type img: str
-        :type bin_path: str
         """
         """
-        self._vhost_id = 0
+        self._nic_id = 0
+        self._node = node
+        self._arch = Topology.get_node_arch(self._node)
+        self._opt = dict()
+
+        # Architecture specific options
+        if self._arch == u"aarch64":
+            self._opt[u"machine_args"] = \
+                u"virt,accel=kvm,usb=off,mem-merge=off,gic-version=3"
+            self._opt[u"console"] = u"ttyAMA0"
+        else:
+            self._opt[u"machine_args"] = u"pc,accel=kvm,usb=off,mem-merge=off"
+            self._opt[u"console"] = u"ttyS0"
+        self._testpmd_path = f"{Constants.QEMU_VM_DPDK}/build/app"
         self._vm_info = {
         self._vm_info = {
-            'type': NodeType.VM,
-            'port': 10021 + qemu_id,
-            'serial': 4555 + qemu_id,
-            'username': 'cisco',
-            'password': 'cisco',
-            'interfaces': {},
+            u"host": node[u"host"],
+            u"type": NodeType.VM,
+            u"port": 10021 + qemu_id,
+            u"serial": 4555 + qemu_id,
+            u"username": 'testuser',
+            u"password": 'Csit1234',
+            u"interfaces": {},
         }
         }
-        if node:
-            self.qemu_set_node(node)
+        if node[u"port"] != 22:
+            self._vm_info[u"host_port"] = node[u"port"]
+            self._vm_info[u"host_username"] = node[u"username"]
+            self._vm_info[u"host_password"] = node[u"password"]
         # Input Options.
         # Input Options.
-        self._opt = QemuOptions()
-        self._opt.add('qemu_id', qemu_id)
-        self._opt.add('bin_path', bin_path)
-        self._opt.add('mem', int(mem))
-        self._opt.add('smp', int(smp))
-        self._opt.add('img', img)
-        self._opt.add('vnf', vnf)
+        self._opt[u"qemu_id"] = qemu_id
+        self._opt[u"mem"] = int(mem)
+        self._opt[u"smp"] = int(smp)
+        self._opt[u"img"] = img
+        self._opt[u"vnf"] = vnf
         # Temporary files.
         # Temporary files.
-        self._temp = QemuOptions()
-        self._temp.add('pid', '/var/run/qemu_{id}.pid'.format(id=qemu_id))
-        # Computed parameters for QEMU command line.
-        if '/var/lib/vm/' in img:
-            self._opt.add('vm_type', 'nestedvm')
-            self._temp.add('qmp', '/var/run/qmp_{id}.sock'.format(id=qemu_id))
-            self._temp.add('qga', '/var/run/qga_{id}.sock'.format(id=qemu_id))
+        self._temp = dict()
+        self._temp[u"log"] = f"/tmp/serial_{qemu_id}.log"
+        self._temp[u"pidfile"] = f"/run/qemu_{qemu_id}.pid"
+        if img == Constants.QEMU_VM_IMAGE:
+            self._temp[u"qmp"] = f"/run/qmp_{qemu_id}.sock"
+            self._temp[u"qga"] = f"/run/qga_{qemu_id}.sock"
+        elif img == Constants.QEMU_VM_KERNEL:
+            self._opt[u"img"], _ = exec_cmd_no_error(
+                node, f"ls -1 {Constants.QEMU_VM_KERNEL}* | tail -1",
+                message=u"Qemu Kernel VM image not found!"
+            )
+            self._temp[u"ini"] = f"/etc/vm_init_{qemu_id}.conf"
+            self._opt[u"initrd"], _ = exec_cmd_no_error(
+                node, f"ls -1 {Constants.QEMU_VM_KERNEL_INITRD}* | tail -1",
+                message=u"Qemu Kernel initrd image not found!"
+            )
         else:
         else:
-            raise RuntimeError('QEMU: Unknown VM image option!')
-        self._params = QemuOptions()
-        self.add_params()
-
-    def add_params(self):
-        """Set QEMU command line parameters."""
-        self.add_default_params()
-        if self._opt.get('vm_type') == 'nestedvm':
-            self.add_nestedvm_params()
-        else:
-            raise RuntimeError('QEMU: Unsupported VM type!')
+            raise RuntimeError(f"QEMU: Unknown VM image option: {img}")
+        # Computed parameters for QEMU command line.
+        self._params = OptionString(prefix=u"-")
 
     def add_default_params(self):
         """Set default QEMU command line parameters."""
 
     def add_default_params(self):
         """Set default QEMU command line parameters."""
-        self._params.add('daemonize', '')
-        self._params.add('nodefaults', '')
-        self._params.add('name', 'vnf{qemu},debug-threads=on'.
-                         format(qemu=self._opt.get('qemu_id')))
-        self._params.add('no-user-config', '')
-        self._params.add('monitor', 'none')
-        self._params.add('display', 'none')
-        self._params.add('vga', 'none')
-        self._params.add('enable-kvm', '')
-        self._params.add('pidfile', '{pid}'.
-                         format(pid=self._temp.get('pid')))
-        self._params.add('cpu', 'host')
-        self._params.add('machine', 'pc,accel=kvm,usb=off,mem-merge=off')
-        self._params.add('smp', '{smp},sockets=1,cores={smp},threads=1'.
-                         format(smp=self._opt.get('smp')))
-        self._params.add('object',
-                         'memory-backend-file,id=mem,size={mem}M,'
-                         'mem-path=/mnt/huge,share=on'.
-                         format(mem=self._opt.get('mem')))
-        self._params.add('m', '{mem}M'.
-                         format(mem=self._opt.get('mem')))
-        self._params.add('numa', 'node,memdev=mem')
-        self._params.add('balloon', 'none')
-
-    def add_nestedvm_params(self):
-        """Set NestedVM QEMU parameters."""
-        self._params.add('net', 'nic,macaddr=52:54:00:00:{qemu:02x}:ff'.
-                         format(qemu=self._opt.get('qemu_id')))
-        self._params.add('net', 'user,hostfwd=tcp::{info[port]}-:22'.
-                         format(info=self._vm_info))
-        # TODO: Remove try except after fully migrated to Bionic or
-        # qemu_set_node is removed.
-        try:
-            locking = ',file.locking=off'\
-                if self.qemu_version(version='2.10') else ''
-        except AttributeError:
-            locking = ''
-        self._params.add('drive',
-                         'file={img},format=raw,cache=none,if=virtio{locking}'.
-                         format(img=self._opt.get('img'), locking=locking))
-        self._params.add('qmp', 'unix:{qmp},server,nowait'.
-                         format(qmp=self._temp.get('qmp')))
-        self._params.add('chardev', 'socket,host=127.0.0.1,port={info[serial]},'
-                         'id=gnc0,server,nowait'.format(info=self._vm_info))
-        self._params.add('device', 'isa-serial,chardev=gnc0')
-        self._params.add('chardev',
-                         'socket,path={qga},server,nowait,id=qga0'.
-                         format(qga=self._temp.get('qga')))
-        self._params.add('device', 'isa-serial,chardev=qga0')
-
-    def qemu_set_node(self, node):
-        """Set node to run QEMU on.
+        self._params.add(u"daemonize")
+        self._params.add(u"nodefaults")
+        self._params.add_with_value(
+            u"name", f"vnf{self._opt.get(u'qemu_id')},debug-threads=on"
+        )
+        self._params.add(u"no-user-config")
+        self._params.add(u"nographic")
+        self._params.add(u"enable-kvm")
+        self._params.add_with_value(u"pidfile", self._temp.get(u"pidfile"))
+        self._params.add_with_value(u"cpu", u"host")
+
+        self._params.add_with_value(u"machine", self._opt.get(u"machine_args"))
+        self._params.add_with_value(
+            u"smp", f"{self._opt.get(u'smp')},sockets=1,"
+            f"cores={self._opt.get(u'smp')},threads=1"
+        )
+        self._params.add_with_value(
+            u"object", f"memory-backend-file,id=mem,"
+            f"size={self._opt.get(u'mem')}M,mem-path=/dev/hugepages,share=on"
+        )
+        self._params.add_with_value(u"m", f"{self._opt.get(u'mem')}M")
+        self._params.add_with_value(u"numa", u"node,memdev=mem")
+
+    def add_net_user(self, net="10.0.2.0/24"):
+        """Set managment port forwarding."""
+        self._params.add_with_value(
+            u"netdev", f"user,id=mgmt,net={net},"
+            f"hostfwd=tcp::{self._vm_info[u'port']}-:22"
+        )
+        self._params.add_with_value(
+            u"device", f"virtio-net,netdev=mgmt"
+        )
+
+    def add_qmp_qga(self):
+        """Set QMP, QGA management."""
+        self._params.add_with_value(
+            u"chardev", f"socket,path={self._temp.get(u'qga')},"
+            f"server,nowait,id=qga0"
+        )
+        self._params.add_with_value(
+            u"device", u"isa-serial,chardev=qga0"
+        )
+        self._params.add_with_value(
+            u"qmp", f"unix:{self._temp.get(u'qmp')},server,nowait"
+        )
+
+    def add_serial(self):
+        """Set serial to file redirect."""
+        self._params.add_with_value(
+            u"chardev", f"socket,host=127.0.0.1,"
+            f"port={self._vm_info[u'serial']},id=gnc0,server,nowait"
+        )
+        self._params.add_with_value(
+            u"device", u"isa-serial,chardev=gnc0"
+        )
+        self._params.add_with_value(
+            u"serial", f"file:{self._temp.get(u'log')}"
+        )
+
+    def add_drive_cdrom(self, drive_file, index=None):
+        """Set CD-ROM drive.
+
+        :param drive_file: Path to drive image.
+        :param index: Drive index.
+        :type drive_file: str
+        :type index: int
+        """
+        index = f"index={index}," if index else u""
+        self._params.add_with_value(
+            u"drive", f"file={drive_file},{index}media=cdrom"
+        )
+
+    def add_drive(self, drive_file, drive_format):
+        """Set drive with custom format.
+
+        :param drive_file: Path to drive image.
+        :param drive_format: Drive image format.
+        :type drive_file: str
+        :type drive_format: str
+        """
+        self._params.add_with_value(
+            u"drive", f"file={drive_file},format={drive_format},"
+            u"cache=none,if=virtio,file.locking=off"
+        )
+
+    def add_kernelvm_params(self):
+        """Set KernelVM QEMU parameters."""
+        self._params.add_with_value(
+            u"serial", f"file:{self._temp.get(u'log')}"
+        )
+        self._params.add_with_value(
+            u"fsdev", u"local,id=root9p,path=/,security_model=none"
+        )
+        self._params.add_with_value(
+            u"device", u"virtio-9p-pci,fsdev=root9p,mount_tag=virtioroot"
+        )
+        self._params.add_with_value(
+            u"kernel", f"{self._opt.get(u'img')}"
+        )
+        self._params.add_with_value(
+            u"initrd", f"{self._opt.get(u'initrd')}"
+        )
+        self._params.add_with_value(
+            u"append", f"'ro rootfstype=9p rootflags=trans=virtio "
+            f"root=virtioroot console={self._opt.get(u'console')} "
+            f"tsc=reliable hugepages=512 "
+            f"init={self._temp.get(u'ini')} fastboot'"
+        )
+
+    def add_vhost_user_if(
+            self, socket, server=True, jumbo_frames=False, queue_size=None,
+            queues=1, virtio_feature_mask=None):
+        """Add Vhost-user interface.
 
 
-        :param node: Node to run QEMU on.
-        :type node: dict
+        :param socket: Path of the unix socket.
+        :param server: If True the socket shall be a listening socket.
+        :param jumbo_frames: Set True if jumbo frames are used in the test.
+        :param queue_size: Vring queue size.
+        :param queues: Number of queues.
+        :param virtio_feature_mask: Mask of virtio features to be enabled.
+        :type socket: str
+        :type server: bool
+        :type jumbo_frames: bool
+        :type queue_size: int
+        :type queues: int
+        :type virtio_feature_mask: int
         """
         """
-        self._node = node
-        self._vm_info['host'] = node['host']
-        if node['port'] != 22:
-            self._vm_info['host_port'] = node['port']
-            self._vm_info['host_username'] = node['username']
-            self._vm_info['host_password'] = node['password']
+        self._nic_id += 1
+        self._params.add_with_value(
+            u"chardev", f"socket,id=char{self._nic_id},"
+            f"path={socket}{u',server' if server is True else u''}"
+        )
+        self._params.add_with_value(
+            u"netdev", f"vhost-user,id=vhost{self._nic_id},"
+            f"chardev=char{self._nic_id},queues={queues}"
+        )
+        mac = f"52:54:00:00:{self._opt.get(u'qemu_id'):02x}:" \
+            f"{self._nic_id:02x}"
+        queue_size = f"rx_queue_size={queue_size},tx_queue_size={queue_size}" \
+            if queue_size else u""
+        gso = VirtioFeatureMask.is_feature_enabled(
+            virtio_feature_mask, VirtioFeaturesFlags.VIRTIO_NET_F_API_GSO)
+        csum = VirtioFeatureMask.is_feature_enabled(
+            virtio_feature_mask, VirtioFeaturesFlags.VIRTIO_NET_F_API_CSUM)
+
+        self._params.add_with_value(
+            u"device", f"virtio-net-pci,netdev=vhost{self._nic_id},mac={mac},"
+            f"addr={self._nic_id+5}.0,mq=on,vectors={2 * queues + 2},"
+            f"csum={u'on' if csum else u'off'},"
+            f"gso={u'on' if gso else u'off'},"
+            f"guest_tso4={u'on' if gso else u'off'},"
+            f"guest_tso6={u'on' if gso else u'off'},"
+            f"guest_ecn={u'on' if gso else u'off'},"
+            f"{queue_size}"
+        )
+
+        # Add interface MAC and socket to the node dict.
+        if_data = {u"mac_address": mac, u"socket": socket}
+        if_name = f"vhost{self._nic_id}"
+        self._vm_info[u"interfaces"][if_name] = if_data
+        # Add socket to temporary file list.
+        self._temp[if_name] = socket
+
+    def add_vfio_pci_if(self, pci):
+        """Add VFIO PCI interface.
+
+        :param pci: PCI address of interface.
+        :type pci: str
+        """
+        self._nic_id += 1
+        self._params.add_with_value(
+            u"device", f"vfio-pci,host={pci},addr={self._nic_id+5}.0"
+        )
+
+    def create_kernelvm_config_vpp(self, **kwargs):
+        """Create QEMU VPP config files.
+
+        :param kwargs: Key-value pairs to replace content of VPP configuration
+            file.
+        :type kwargs: dict
+        """
+        startup = f"/etc/vpp/vm_startup_{self._opt.get(u'qemu_id')}.conf"
+        running = f"/etc/vpp/vm_running_{self._opt.get(u'qemu_id')}.exec"
+
+        self._temp[u"startup"] = startup
+        self._temp[u"running"] = running
+        self._opt[u"vnf_bin"] = f"/usr/bin/vpp -c {startup}"
+
+        # Create VPP startup configuration.
+        vpp_config = VppConfigGenerator()
+        vpp_config.set_node(self._node)
+        vpp_config.add_unix_nodaemon()
+        vpp_config.add_unix_cli_listen()
+        vpp_config.add_unix_exec(running)
+        vpp_config.add_socksvr()
+        vpp_config.add_main_heap_size(u"512M")
+        vpp_config.add_main_heap_page_size(u"2M")
+        vpp_config.add_statseg_size(u"512M")
+        vpp_config.add_statseg_page_size(u"2M")
+        vpp_config.add_statseg_per_node_counters(u"on")
+        vpp_config.add_buffers_per_numa(107520)
+        vpp_config.add_cpu_main_core(u"0")
+        if self._opt.get(u"smp") > 1:
+            vpp_config.add_cpu_corelist_workers(f"1-{self._opt.get(u'smp')-1}")
+        vpp_config.add_plugin(u"disable", u"default")
+        vpp_config.add_plugin(u"enable", u"ping_plugin.so")
+        if "2vfpt" in self._opt.get(u'vnf'):
+            vpp_config.add_plugin(u"enable", u"avf_plugin.so")
+        if "vhost" in self._opt.get(u'vnf'):
+            vpp_config.add_plugin(u"enable", u"dpdk_plugin.so")
+            vpp_config.add_dpdk_dev(u"0000:00:06.0", u"0000:00:07.0")
+            vpp_config.add_dpdk_dev_default_rxq(kwargs[u"queues"])
+            vpp_config.add_dpdk_log_level(u"debug")
+            if not kwargs[u"jumbo_frames"]:
+                vpp_config.add_dpdk_no_multi_seg()
+                vpp_config.add_dpdk_no_tx_checksum_offload()
+        if "ipsec" in self._opt.get(u'vnf'):
+            vpp_config.add_plugin(u"enable", u"crypto_native_plugin.so")
+            vpp_config.add_plugin(u"enable", u"crypto_ipsecmb_plugin.so")
+            vpp_config.add_plugin(u"enable", u"crypto_openssl_plugin.so")
+        if "nat" in self._opt.get(u'vnf'):
+            vpp_config.add_nat(value=u"endpoint-dependent")
+            vpp_config.add_plugin(u"enable", u"nat_plugin.so")
+        vpp_config.write_config(startup)
+
+        # Create VPP running configuration.
+        template = f"{Constants.RESOURCES_TPL}/vm/{self._opt.get(u'vnf')}.exec"
+        exec_cmd_no_error(self._node, f"rm -f {running}", sudo=True)
+
+        with open(template, u"rt") as src_file:
+            src = Template(src_file.read())
+            exec_cmd_no_error(
+                self._node, f"echo '{src.safe_substitute(**kwargs)}' | "
+                f"sudo tee {running}"
+            )
+
+    def create_kernelvm_config_testpmd_io(self, **kwargs):
+        """Create QEMU testpmd-io command line.
+
+        :param kwargs: Key-value pairs to construct command line parameters.
+        :type kwargs: dict
+        """
+        pmd_max_pkt_len = u"9200" if kwargs[u"jumbo_frames"] else u"1518"
+        testpmd_cmd = DpdkUtil.get_testpmd_cmdline(
+            eal_corelist=f"0-{self._opt.get(u'smp') - 1}",
+            eal_driver=False,
+            eal_pci_whitelist0=u"0000:00:06.0",
+            eal_pci_whitelist1=u"0000:00:07.0",
+            eal_in_memory=True,
+            pmd_num_mbufs=32768,
+            pmd_fwd_mode=u"io",
+            pmd_nb_ports=u"2",
+            pmd_portmask=u"0x3",
+            pmd_max_pkt_len=pmd_max_pkt_len,
+            pmd_mbuf_size=u"16384",
+            pmd_rxq=kwargs[u"queues"],
+            pmd_txq=kwargs[u"queues"],
+            pmd_tx_offloads='0x0',
+            pmd_nb_cores=str(self._opt.get(u"smp") - 1)
+        )
+
+        self._opt[u"vnf_bin"] = f"{self._testpmd_path}/{testpmd_cmd}"
+
+    def create_kernelvm_config_testpmd_mac(self, **kwargs):
+        """Create QEMU testpmd-mac command line.
+
+        :param kwargs: Key-value pairs to construct command line parameters.
+        :type kwargs: dict
+        """
+        pmd_max_pkt_len = u"9200" if kwargs[u"jumbo_frames"] else u"1518"
+        testpmd_cmd = DpdkUtil.get_testpmd_cmdline(
+            eal_corelist=f"0-{self._opt.get(u'smp') - 1}",
+            eal_driver=False,
+            eal_pci_whitelist0=u"0000:00:06.0",
+            eal_pci_whitelist1=u"0000:00:07.0",
+            eal_in_memory=True,
+            pmd_num_mbufs=32768,
+            pmd_fwd_mode=u"mac",
+            pmd_nb_ports=u"2",
+            pmd_portmask=u"0x3",
+            pmd_max_pkt_len=pmd_max_pkt_len,
+            pmd_mbuf_size=u"16384",
+            pmd_eth_peer_0=f"0,{kwargs[u'vif1_mac']}",
+            pmd_eth_peer_1=f"1,{kwargs[u'vif2_mac']}",
+            pmd_rxq=kwargs[u"queues"],
+            pmd_txq=kwargs[u"queues"],
+            pmd_tx_offloads=u"0x0",
+            pmd_nb_cores=str(self._opt.get(u"smp") - 1)
+        )
+
+        self._opt[u"vnf_bin"] = f"{self._testpmd_path}/{testpmd_cmd}"
+
+    def create_kernelvm_config_iperf3(self):
+        """Create QEMU iperf3 command line."""
+        self._opt[u"vnf_bin"] = f"mkdir /run/sshd; /usr/sbin/sshd -D -d"
+
+    def create_kernelvm_init(self, **kwargs):
+        """Create QEMU init script.
+
+        :param kwargs: Key-value pairs to replace content of init startup file.
+        :type kwargs: dict
+        """
+        init = self._temp.get(u"ini")
+        exec_cmd_no_error(self._node, f"rm -f {init}", sudo=True)
+
+        with open(kwargs[u"template"], u"rt") as src_file:
+            src = Template(src_file.read())
+            exec_cmd_no_error(
+                self._node, f"echo '{src.safe_substitute(**kwargs)}' | "
+                f"sudo tee {init}"
+            )
+            exec_cmd_no_error(self._node, f"chmod +x {init}", sudo=True)
+
+    def configure_kernelvm_vnf(self, **kwargs):
+        """Create KernelVM VNF configurations.
+
+        :param kwargs: Key-value pairs for templating configs.
+        :type kwargs: dict
+        """
+        if u"vpp" in self._opt.get(u"vnf"):
+            self.create_kernelvm_config_vpp(**kwargs)
+            self.create_kernelvm_init(
+                template=f"{Constants.RESOURCES_TPL}/vm/init.sh",
+                vnf_bin=self._opt.get(u"vnf_bin")
+            )
+        elif u"testpmd_io" in self._opt.get(u"vnf"):
+            self.create_kernelvm_config_testpmd_io(**kwargs)
+            self.create_kernelvm_init(
+                template=f"{Constants.RESOURCES_TPL}/vm/init.sh",
+                vnf_bin=self._opt.get(u"vnf_bin")
+            )
+        elif u"testpmd_mac" in self._opt.get(u"vnf"):
+            self.create_kernelvm_config_testpmd_mac(**kwargs)
+            self.create_kernelvm_init(
+                template=f"{Constants.RESOURCES_TPL}/vm/init.sh",
+                vnf_bin=self._opt.get(u"vnf_bin")
+            )
+        elif u"iperf3" in self._opt.get(u"vnf"):
+            qemu_id = self._opt.get(u'qemu_id') % 2
+            self.create_kernelvm_config_iperf3()
+            self.create_kernelvm_init(
+                template=f"{Constants.RESOURCES_TPL}/vm/init_iperf3.sh",
+                vnf_bin=self._opt.get(u"vnf_bin"),
+                ip_address_l=u"2.2.2.2/30" if qemu_id else u"1.1.1.1/30",
+                ip_address_r=u"2.2.2.1" if qemu_id else u"1.1.1.2",
+                ip_route_r=u"1.1.1.0/30" if qemu_id else u"2.2.2.0/30"
+            )
+        else:
+            raise RuntimeError(u"QEMU: Unsupported VNF!")
 
     def get_qemu_pids(self):
         """Get QEMU CPU pids.
 
     def get_qemu_pids(self):
         """Get QEMU CPU pids.
@@ -224,36 +471,42 @@ class QemuUtils(object):
         :returns: List of QEMU CPU pids.
         :rtype: list of str
         """
         :returns: List of QEMU CPU pids.
         :rtype: list of str
         """
-        command = ("grep -rwl 'CPU' /proc/$(sudo cat {pid})/task/*/comm ".
-                   format(pid=self._temp.get('pid')))
-        command += (r"| xargs dirname | sed -e 's/\/.*\///g'")
+        command = f"grep -rwl 'CPU' /proc/$(sudo cat " \
+            f"{self._temp.get(u'pidfile')})/task/*/comm "
+        command += r"| xargs dirname | sed -e 's/\/.*\///g' | uniq"
 
         stdout, _ = exec_cmd_no_error(self._node, command)
         return stdout.splitlines()
 
     def qemu_set_affinity(self, *host_cpus):
         """Set qemu affinity by getting thread PIDs via QMP and taskset to list
 
         stdout, _ = exec_cmd_no_error(self._node, command)
         return stdout.splitlines()
 
     def qemu_set_affinity(self, *host_cpus):
         """Set qemu affinity by getting thread PIDs via QMP and taskset to list
-        of CPU cores.
+        of CPU cores. Function tries to execute 3 times to avoid race condition
+        in getting thread PIDs.
 
         :param host_cpus: List of CPU cores.
         :type host_cpus: list
         """
 
         :param host_cpus: List of CPU cores.
         :type host_cpus: list
         """
-        try:
-            qemu_cpus = self.get_qemu_pids()
-
-            if len(qemu_cpus) != len(host_cpus):
-                raise ValueError('Host CPU count must match Qemu Thread count!')
-
-            for qemu_cpu, host_cpu in zip(qemu_cpus, host_cpus):
-                command = ('taskset -pc {host_cpu} {thread}'.
-                           format(host_cpu=host_cpu, thread=qemu_cpu))
-                message = ('QEMU: Set affinity failed on {host}!'.
-                           format(host=self._node['host']))
-                exec_cmd_no_error(self._node, command, sudo=True,
-                                  message=message)
-        except (RuntimeError, ValueError):
+        for _ in range(3):
+            try:
+                qemu_cpus = self.get_qemu_pids()
+
+                if len(qemu_cpus) != len(host_cpus):
+                    sleep(1)
+                    continue
+                for qemu_cpu, host_cpu in zip(qemu_cpus, host_cpus):
+                    command = f"taskset -pc {host_cpu} {qemu_cpu}"
+                    message = f"QEMU: Set affinity failed " \
+                        f"on {self._node[u'host']}!"
+                    exec_cmd_no_error(
+                        self._node, command, sudo=True, message=message
+                    )
+                break
+            except (RuntimeError, ValueError):
+                self.qemu_kill_all()
+                raise
+        else:
             self.qemu_kill_all()
             self.qemu_kill_all()
-            raise
+            raise RuntimeError(u"Failed to set Qemu threads affinity!")
 
     def qemu_set_scheduler_policy(self):
         """Set scheduler policy to SCHED_RR with priority 1 for all Qemu CPU
 
     def qemu_set_scheduler_policy(self):
         """Set scheduler policy to SCHED_RR with priority 1 for all Qemu CPU
@@ -265,62 +518,15 @@ class QemuUtils(object):
             qemu_cpus = self.get_qemu_pids()
 
             for qemu_cpu in qemu_cpus:
             qemu_cpus = self.get_qemu_pids()
 
             for qemu_cpu in qemu_cpus:
-                command = ('chrt -r -p 1 {thread}'.
-                           format(thread=qemu_cpu))
-                message = ('QEMU: Set SCHED_RR failed on {host}'.
-                           format(host=self._node['host']))
-                exec_cmd_no_error(self._node, command, sudo=True,
-                                  message=message)
+                command = f"chrt -r -p 1 {qemu_cpu}"
+                message = f"QEMU: Set SCHED_RR failed on {self._node[u'host']}"
+                exec_cmd_no_error(
+                    self._node, command, sudo=True, message=message
+                )
         except (RuntimeError, ValueError):
             self.qemu_kill_all()
             raise
 
         except (RuntimeError, ValueError):
             self.qemu_kill_all()
             raise
 
-    def qemu_add_vhost_user_if(self, socket, server=True, jumbo_frames=False,
-                               queue_size=None, queues=1):
-        """Add Vhost-user interface.
-
-        :param socket: Path of the unix socket.
-        :param server: If True the socket shall be a listening socket.
-        :param jumbo_frames: Set True if jumbo frames are used in the test.
-        :param queue_size: Vring queue size.
-        :param queues: Number of queues.
-        :type socket: str
-        :type server: bool
-        :type jumbo_frames: bool
-        :type queue_size: int
-        :type queues: int
-        """
-        self._vhost_id += 1
-        self._params.add('chardev',
-                         'socket,id=char{vhost},path={socket}{server}'.
-                         format(vhost=self._vhost_id, socket=socket,
-                                server=',server' if server is True else ''))
-        self._params.add('netdev',
-                         'vhost-user,id=vhost{vhost},'
-                         'chardev=char{vhost},queues={queues}'.
-                         format(vhost=self._vhost_id, queues=queues))
-        mac = ('52:54:00:00:{qemu:02x}:{vhost:02x}'.
-               format(qemu=self._opt.get('qemu_id'), vhost=self._vhost_id))
-        queue_size = ('rx_queue_size={queue_size},tx_queue_size={queue_size}'.
-                      format(queue_size=queue_size)) if queue_size else ''
-        mbuf = 'on,host_mtu=9200'
-        self._params.add('device',
-                         'virtio-net-pci,netdev=vhost{vhost},'
-                         'mac={mac},mq=on,vectors={vectors},csum=off,gso=off,'
-                         'guest_tso4=off,guest_tso6=off,guest_ecn=off,'
-                         'mrg_rxbuf={mbuf},{queue_size}'.
-                         format(vhost=self._vhost_id, mac=mac,
-                                mbuf=mbuf if jumbo_frames else 'off',
-                                queue_size=queue_size,
-                                vectors=(2 * queues + 2)))
-
-        # Add interface MAC and socket to the node dict.
-        if_data = {'mac_address': mac, 'socket': socket}
-        if_name = 'vhost{vhost}'.format(vhost=self._vhost_id)
-        self._vm_info['interfaces'][if_name] = if_data
-        # Add socket to temporary file list.
-        self._temp.add(if_name, socket)
-
     def _qemu_qmp_exec(self, cmd):
         """Execute QMP command.
 
     def _qemu_qmp_exec(self, cmd):
         """Execute QMP command.
 
@@ -333,32 +539,32 @@ 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.
-        command = ('echo "{{ \\"execute\\": \\"qmp_capabilities\\" }}'
-                   '{{ \\"execute\\": \\"{cmd}\\" }}" | '
-                   'sudo -S socat - UNIX-CONNECT:{qmp}'.
-                   format(cmd=cmd, qmp=self._temp.get('qmp')))
-        message = ('QMP execute "{cmd}" failed on {host}'.
-                   format(cmd=cmd, host=self._node['host']))
-        stdout, _ = exec_cmd_no_error(self._node, command, sudo=False,
-                                      message=message)
+        command = f"echo \"{{{{ \\\"execute\\\": " \
+            f"\\\"qmp_capabilities\\\" }}}}" \
+            f"{{{{ \\\"execute\\\": \\\"{cmd}\\\" }}}}\" | " \
+            f"sudo -S socat - UNIX-CONNECT:{self._temp.get(u'qmp')}"
+        message = f"QMP execute '{cmd}' failed on {self._node[u'host']}"
+
+        stdout, _ = exec_cmd_no_error(
+            self._node, command, sudo=False, message=message
+        )
 
         # Skip capabilities negotiation messages.
         out_list = stdout.splitlines()
         if len(out_list) < 3:
 
         # Skip capabilities negotiation messages.
         out_list = stdout.splitlines()
         if len(out_list) < 3:
-            raise RuntimeError('Invalid QMP output on {host}'.
-                               format(host=self._node['host']))
+            raise RuntimeError(f"Invalid QMP output on {self._node[u'host']}")
         return json.loads(out_list[2])
 
     def _qemu_qga_flush(self):
         """Flush the QGA parser state."""
         return json.loads(out_list[2])
 
     def _qemu_qga_flush(self):
         """Flush the QGA parser state."""
-        command = ('(printf "\xFF"; sleep 1) | '
-                   'sudo -S socat - UNIX-CONNECT:{qga}'.
-                   format(qga=self._temp.get('qga')))
-        message = ('QGA flush failed on {host}'.format(host=self._node['host']))
-        stdout, _ = exec_cmd_no_error(self._node, command, sudo=False,
-                                      message=message)
+        command = f"(printf \"\xFF\"; sleep 1) | sudo -S socat " \
+            f"- UNIX-CONNECT:{self._temp.get(u'qga')}"
+        message = f"QGA flush failed on {self._node[u'host']}"
+        stdout, _ = exec_cmd_no_error(
+            self._node, command, sudo=False, message=message
+        )
 
 
-        return json.loads(stdout.split('\n', 1)[0]) if stdout else dict()
+        return json.loads(stdout.split(u"\n", 1)[0]) if stdout else dict()
 
     def _qemu_qga_exec(self, cmd):
         """Execute QGA command.
 
     def _qemu_qga_exec(self, cmd):
         """Execute QGA command.
@@ -368,93 +574,137 @@ class QemuUtils(object):
         :param cmd: QGA command to execute.
         :type cmd: str
         """
         :param cmd: QGA command to execute.
         :type cmd: str
         """
-        command = ('(echo "{{ \\"execute\\": \\"{cmd}\\" }}"; sleep 1) | '
-                   'sudo -S socat - UNIX-CONNECT:{qga}'.
-                   format(cmd=cmd, qga=self._temp.get('qga')))
-        message = ('QGA execute "{cmd}" failed on {host}'.
-                   format(cmd=cmd, host=self._node['host']))
-        stdout, _ = exec_cmd_no_error(self._node, command, sudo=False,
-                                      message=message)
+        command = f"(echo \"{{{{ \\\"execute\\\": " \
+            f"\\\"{cmd}\\\" }}}}\"; sleep 1) | " \
+            f"sudo -S socat - UNIX-CONNECT:{self._temp.get(u'qga')}"
+        message = f"QGA execute '{cmd}' failed on {self._node[u'host']}"
+        stdout, _ = exec_cmd_no_error(
+            self._node, command, sudo=False, message=message
+        )
+
+        return json.loads(stdout.split(u"\n", 1)[0]) if stdout else dict()
+
+    def _wait_until_vm_boot(self):
+        """Wait until QEMU VM is booted."""
+        try:
+            getattr(self, f'_wait_{self._opt["vnf"]}')()
+        except AttributeError:
+            self._wait_default()
 
 
-        return json.loads(stdout.split('\n', 1)[0]) if stdout else dict()
+    def _wait_default(self, retries=60):
+        """Wait until QEMU with VPP is booted.
+
+        :param retries: Number of retries.
+        :type retries: int
+        """
+        for _ in range(retries):
+            command = f"tail -1 {self._temp.get(u'log')}"
+            stdout = None
+            try:
+                stdout, _ = exec_cmd_no_error(self._node, command, sudo=True)
+                sleep(1)
+            except RuntimeError:
+                pass
+            if "vpp " in stdout and "built by" in stdout:
+                break
+            if u"Press enter to exit" in stdout:
+                break
+            if u"reboot: Power down" in stdout:
+                raise RuntimeError(
+                    f"QEMU: NF failed to run on {self._node[u'host']}!"
+                )
+        else:
+            raise RuntimeError(
+                f"QEMU: Timeout, VM not booted on {self._node[u'host']}!"
+            )
 
 
-    def _wait_until_vm_boot(self, timeout=60):
-        """Wait until QEMU VM is booted.
+    def _wait_nestedvm(self, retries=12):
+        """Wait until QEMU with NestedVM is booted.
 
         First try to flush qga until there is output.
         Then ping QEMU guest agent each 5s until VM booted or timeout.
 
 
         First try to flush qga until there is output.
         Then ping QEMU guest agent each 5s until VM booted or timeout.
 
-        :param timeout: Waiting timeout in seconds (optional, default 60s).
-        :type timeout: int
+        :param retries: Number of retries with 5s between trials.
+        :type retries: int
         """
         """
-        start = time()
-        while True:
-            if time() - start > timeout:
-                raise RuntimeError('timeout, VM not booted on {host}'.
-                                   format(host=self._node['host']))
+        for _ in range(retries):
             out = None
             try:
                 out = self._qemu_qga_flush()
             except ValueError:
             out = None
             try:
                 out = self._qemu_qga_flush()
             except ValueError:
-                logger.trace('QGA qga flush unexpected output {out}'.
-                             format(out=out))
+                logger.trace(f"QGA qga flush unexpected output {out}")
             # Empty output - VM not booted yet
             if not out:
                 sleep(5)
             else:
                 break
             # Empty output - VM not booted yet
             if not out:
                 sleep(5)
             else:
                 break
-        while True:
-            if time() - start > timeout:
-                raise RuntimeError('timeout, VM not booted on {host}'.
-                                   format(host=self._node['host']))
+        else:
+            raise RuntimeError(
+                f"QEMU: Timeout, VM not booted on {self._node[u'host']}!"
+            )
+        for _ in range(retries):
             out = None
             try:
             out = None
             try:
-                out = self._qemu_qga_exec('guest-ping')
+                out = self._qemu_qga_exec(u"guest-ping")
             except ValueError:
             except ValueError:
-                logger.trace('QGA guest-ping unexpected output {out}'.
-                             format(out=out))
+                logger.trace(f"QGA guest-ping unexpected output {out}")
             # Empty output - VM not booted yet.
             if not out:
                 sleep(5)
             # Non-error return - VM booted.
             # Empty output - VM not booted yet.
             if not out:
                 sleep(5)
             # Non-error return - VM booted.
-            elif out.get('return') is not None:
+            elif out.get(u"return") is not None:
                 break
             # Skip error and wait.
                 break
             # Skip error and wait.
-            elif out.get('error') is not None:
+            elif out.get(u"error") is not None:
                 sleep(5)
             else:
                 # If there is an unexpected output from QGA guest-info, try
                 # again until timeout.
                 sleep(5)
             else:
                 # If there is an unexpected output from QGA guest-info, try
                 # again until timeout.
-                logger.trace('QGA guest-ping unexpected output {out}'.
-                             format(out=out))
+                logger.trace(f"QGA guest-ping unexpected output {out}")
+        else:
+            raise RuntimeError(
+                f"QEMU: Timeout, VM not booted on {self._node[u'host']}!"
+            )
 
 
-        logger.trace('VM booted on {host}'.format(host=self._node['host']))
+    def _wait_iperf3(self, retries=60):
+        """Wait until QEMU with iPerf3 is booted.
+
+        :param retries: Number of retries.
+        :type retries: int
+        """
+        grep = u"Server listening on 0.0.0.0 port 22."
+        cmd = f"fgrep '{grep}' {self._temp.get(u'log')}"
+        message = f"QEMU: Timeout, VM not booted on {self._node[u'host']}!"
+        exec_cmd_no_error(
+            self._node, cmd=cmd, sudo=True, message=message, retries=retries,
+            include_reason=True
+        )
 
     def _update_vm_interfaces(self):
         """Update interface names in VM node dict."""
         # Send guest-network-get-interfaces command via QGA, output example:
         # {"return": [{"name": "eth0", "hardware-address": "52:54:00:00:04:01"},
         # {"name": "eth1", "hardware-address": "52:54:00:00:04:02"}]}.
 
     def _update_vm_interfaces(self):
         """Update interface names in VM node dict."""
         # Send guest-network-get-interfaces command via QGA, output example:
         # {"return": [{"name": "eth0", "hardware-address": "52:54:00:00:04:01"},
         # {"name": "eth1", "hardware-address": "52:54:00:00:04:02"}]}.
-        out = self._qemu_qga_exec('guest-network-get-interfaces')
-        interfaces = out.get('return')
+        out = self._qemu_qga_exec(u"guest-network-get-interfaces")
+        interfaces = out.get(u"return")
         mac_name = {}
         if not interfaces:
         mac_name = {}
         if not interfaces:
-            raise RuntimeError('Get VM interface list failed on {host}'.
-                               format(host=self._node['host']))
+            raise RuntimeError(
+                f"Get VM interface list failed on {self._node[u'host']}"
+            )
         # Create MAC-name dict.
         for interface in interfaces:
         # Create MAC-name dict.
         for interface in interfaces:
-            if 'hardware-address' not in interface:
+            if u"hardware-address" not in interface:
                 continue
                 continue
-            mac_name[interface['hardware-address']] = interface['name']
+            mac_name[interface[u"hardware-address"]] = interface[u"name"]
         # Match interface by MAC and save interface name.
         # Match interface by MAC and save interface name.
-        for interface in self._vm_info['interfaces'].values():
-            mac = interface.get('mac_address')
+        for interface in self._vm_info[u"interfaces"].values():
+            mac = interface.get(u"mac_address")
             if_name = mac_name.get(mac)
             if if_name is None:
             if_name = mac_name.get(mac)
             if if_name is None:
-                logger.trace('Interface name for MAC {mac} not found'.
-                             format(mac=mac))
+                logger.trace(f"Interface name for MAC {mac} not found")
             else:
             else:
-                interface['name'] = if_name
+                interface[u"name"] = if_name
 
     def qemu_start(self):
         """Start QEMU and wait until VM boot.
 
     def qemu_start(self):
         """Start QEMU and wait until VM boot.
@@ -462,21 +712,18 @@ class QemuUtils(object):
         :returns: VM node info.
         :rtype: dict
         """
         :returns: VM node info.
         :rtype: dict
         """
-        DUTSetup.check_huge_page(self._node, '/mnt/huge', self._opt.get('mem'))
-
-        command = ('{bin_path}/qemu-system-{arch} {params}'.
-                   format(bin_path=self._opt.get('bin_path'),
-                          arch=Topology.get_node_arch(self._node),
-                          params=self._params))
-        message = ('QEMU: Start failed on {host}!'.
-                   format(host=self._node['host']))
-
+        cmd_opts = OptionString()
+        cmd_opts.add(f"{Constants.QEMU_BIN_PATH}/qemu-system-{self._arch}")
+        cmd_opts.extend(self._params)
+        message = f"QEMU: Start failed on {self._node[u'host']}!"
         try:
         try:
-            exec_cmd_no_error(self._node, command, timeout=300, sudo=True,
-                              message=message)
+            DUTSetup.check_huge_page(
+                self._node, u"/dev/hugepages", int(self._opt.get(u"mem")))
+
+            exec_cmd_no_error(
+                self._node, cmd_opts, timeout=300, sudo=True, message=message
+            )
             self._wait_until_vm_boot()
             self._wait_until_vm_boot()
-            # Update interface names in VM node dict.
-            self._update_vm_interfaces()
         except RuntimeError:
             self.qemu_kill_all()
             raise
         except RuntimeError:
             self.qemu_kill_all()
             raise
@@ -484,76 +731,37 @@ class QemuUtils(object):
 
     def qemu_kill(self):
         """Kill qemu process."""
 
     def qemu_kill(self):
         """Kill qemu process."""
-        exec_cmd(self._node, 'chmod +r {pid}'.
-                 format(pid=self._temp.get('pid')), sudo=True)
-        exec_cmd(self._node, 'kill -SIGKILL $(cat {pid})'.
-                 format(pid=self._temp.get('pid')), sudo=True)
-
-        for value in self._temp.get_values():
-            exec_cmd(self._node, 'rm -f {value}'.format(value=value), sudo=True)
-
-    def qemu_kill_all(self, node=None):
-        """Kill all qemu processes on DUT node if specified.
-
-        :param node: Node to kill all QEMU processes on.
-        :type node: dict
-        """
-        if node:
-            self.qemu_set_node(node)
-        exec_cmd(self._node, 'pkill -SIGKILL qemu', sudo=True)
-
-        for value in self._temp.get_values():
-            exec_cmd(self._node, 'rm -f {value}'.format(value=value), sudo=True)
-
-    def qemu_version(self, version=None):
-        """Return Qemu version or compare if version is higher than parameter.
-
-        :param version: Version to compare.
-        :type version: str
-        :returns: Qemu version or Boolean if version is higher than parameter.
-        :rtype: str or bool
+        exec_cmd(
+            self._node, f"chmod +r {self._temp.get(u'pidfile')}", sudo=True
+        )
+        exec_cmd(
+            self._node, f"kill -SIGKILL $(cat {self._temp.get(u'pidfile')})",
+            sudo=True
+        )
+
+        for value in self._temp.values():
+            exec_cmd(self._node, f"cat {value}", sudo=True)
+            exec_cmd(self._node, f"rm -f {value}", sudo=True)
+
+    def qemu_kill_all(self):
+        """Kill all qemu processes on DUT node if specified."""
+        exec_cmd(self._node, u"pkill -SIGKILL qemu", sudo=True)
+
+        for value in self._temp.values():
+            exec_cmd(self._node, f"cat {value}", sudo=True)
+            exec_cmd(self._node, f"rm -f {value}", sudo=True)
+
+    def qemu_version(self):
+        """Return Qemu version.
+
+        :returns: Qemu version.
+        :rtype: str
         """
         """
-        command = ('{bin_path}/qemu-system-{arch} --version'.
-                   format(bin_path=self._opt.get('bin_path'),
-                          arch=Topology.get_node_arch(self._node)))
+        command = f"{Constants.QEMU_BIN_PATH}/qemu-system-{self._arch} " \
+            f"--version"
         try:
             stdout, _ = exec_cmd_no_error(self._node, command, sudo=True)
         try:
             stdout, _ = exec_cmd_no_error(self._node, command, sudo=True)
-            ver = match(r'QEMU emulator version ([\d.]*)', stdout).group(1)
-            return StrictVersion(ver) > StrictVersion(version) \
-                if version else ver
+            return match(r"QEMU emulator version ([\d.]*)", stdout).group(1)
         except RuntimeError:
             self.qemu_kill_all()
             raise
         except RuntimeError:
             self.qemu_kill_all()
             raise
-
-    @staticmethod
-    def build_qemu(node, force_install=False, apply_patch=False):
-        """Build QEMU from sources.
-
-        :param node: Node to build QEMU on.
-        :param force_install: If True, then remove previous build.
-        :param apply_patch: If True, then apply patches from qemu_patches dir.
-        :type node: dict
-        :type force_install: bool
-        :type apply_patch: bool
-        :raises RuntimeError: If building QEMU failed.
-        """
-        directory = (' --directory={install_dir}{patch}'.
-                     format(install_dir=Constants.QEMU_INSTALL_DIR,
-                            patch='-patch' if apply_patch else '-base'))
-        version = (' --version={install_version}'.
-                   format(install_version=Constants.QEMU_INSTALL_VERSION))
-        force = ' --force' if force_install else ''
-        patch = ' --patch' if apply_patch else ''
-        target_list = (' --target-list={arch}-softmmu'.
-                       format(arch=Topology.get_node_arch(node)))
-
-        command = ("sudo -E sh -c "
-                   "'{fw_dir}/{lib_sh}/qemu_build.sh{version}{directory}"
-                   "{force}{patch}{target_list}'".
-                   format(fw_dir=Constants.REMOTE_FW_DIR,
-                          lib_sh=Constants.RESOURCES_LIB_SH,
-                          version=version, directory=directory, force=force,
-                          patch=patch, target_list=target_list))
-        message = ('QEMU: Build failed on {host}!'.format(host=node['host']))
-        exec_cmd_no_error(node, command, sudo=False, message=message,
-                          timeout=1000)