"""QEMU utilities library."""
+from time import time, sleep
+import json
+import re
+
from robot.api import logger
-from ssh import SSH
-from constants import Constants
+
+from resources.libraries.python.ssh import SSH
+from resources.libraries.python.constants import Constants
+from resources.libraries.python.topology import NodeType
class QemuUtils(object):
"""QEMU utilities."""
+ __QEMU_BIN = '/usr/bin/qemu-system-x86_64'
+ # QEMU Machine Protocol socket
+ __QMP_SOCK = '/tmp/qmp.sock'
+ # QEMU Guest Agent socket
+ __QGA_SOCK = '/tmp/qga.sock'
+
+ def __init__(self):
+ self._qemu_opt = {}
+ # Default 1 CPU.
+ self._qemu_opt['smp'] = '-smp 1,sockets=1,cores=1,threads=1'
+ # 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 ' \
+ '-net nic,macaddr=52:54:00:00:02:01 -balloon none'
+ self._qemu_opt['ssh_fwd_port'] = 10022
+ # Default serial console port
+ self._qemu_opt['serial_port'] = 4556
+ # Default 512MB virtual RAM
+ self._qemu_opt['mem_size'] = 512
+ # Default huge page mount point, required for Vhost-user interfaces.
+ self._qemu_opt['huge_mnt'] = '/mnt/huge'
+ # Default do not allocate huge pages.
+ self._qemu_opt['huge_allocate'] = False
+ # Default image for CSIT virl setup
+ self._qemu_opt['disk_image'] = '/var/lib/vm/vhost-nested.img'
+ # VM node info dict
+ self._vm_info = {
+ 'type': NodeType.VM,
+ 'port': 10022,
+ 'username': 'cisco',
+ 'password': 'cisco',
+ 'interfaces': {},
+ }
+ self._vhost_id = 0
+ self._ssh = None
+ self._node = None
+ self._socks = [self.__QMP_SOCK, self.__QGA_SOCK]
+
+ def qemu_set_smp(self, cpus, cores, threads, sockets):
+ """Set SMP option for QEMU
+
+ :param cpus: Number of CPUs.
+ :param cores: Number of CPU cores on one socket.
+ :param threads: Number of threads on one CPU core.
+ :param sockets: Number of discrete sockets in the system.
+ :type cpus: int
+ :type cores: int
+ :type threads: int
+ :type sockets: int
+ """
+ self._qemu_opt['smp'] = '-smp {},cores={},threads={},sockets={}'.format(
+ cpus, cores, threads, sockets)
+
+ def qemu_set_ssh_fwd_port(self, fwd_port):
+ """Set host port for guest SSH forwarding.
+
+ :param fwd_port: Port number on host for guest SSH forwarding.
+ :type fwd_port: int
+ """
+ self._qemu_opt['ssh_fwd_port'] = fwd_port
+ self._vm_info['port'] = fwd_port
+
+ def qemu_set_serial_port(self, port):
+ """Set serial console port.
+
+ :param port: Serial console port.
+ :type port: int
+ """
+ self._qemu_opt['serial_port'] = port
+
+ def qemu_set_mem_size(self, mem_size):
+ """Set virtual RAM size.
+
+ :param mem_size: RAM size in Mega Bytes.
+ :type mem_size: int
+ """
+ self._qemu_opt['mem_size'] = int(mem_size)
+
+ def qemu_set_huge_mnt(self, huge_mnt):
+ """Set hugefile mount point.
+
+ :param huge_mnt: System hugefile mount point.
+ :type huge_mnt: int
+ """
+ self._qemu_opt['huge_mnt'] = huge_mnt
+
+ def qemu_set_huge_allocate(self):
+ """Set flag to allocate more huge pages if needed."""
+ self._qemu_opt['huge_allocate'] = True
+
+ def qemu_set_disk_image(self, disk_image):
+ """Set disk image.
+
+ :param disk_image: Path of the disk image.
+ :type disk_image: str
+ """
+ self._qemu_opt['disk_image'] = disk_image
+
+ def qemu_set_affinity(self, *host_cpus):
+ """Set qemu affinity by getting thread PIDs via QMP and taskset to list
+ of CPU cores.
+
+ :param host_cpus: List of CPU cores.
+ :type host_cpus: list
+ """
+ qemu_cpus = self._qemu_qmp_exec('query-cpus')['return']
+
+ if len(qemu_cpus) != len(host_cpus):
+ logger.debug('Host CPU count {0}, Qemu Thread count {1}'.format(
+ len(host_cpus), len(qemu_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'])
+ (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.
+
+ :param node: Node to run QEMU on.
+ :type node: dict
+ """
+ self._node = node
+ self._ssh = SSH()
+ self._ssh.connect(node)
+ self._vm_info['host'] = node['host']
+
+ def qemu_add_vhost_user_if(self, socket, server=True, mac=None):
+ """Add Vhost-user interface.
+
+ :param socket: Path of the unix socket.
+ :param server: If True the socket shall be a listening socket.
+ :param mac: Vhost-user interface MAC address (optional, otherwise is
+ used autogenerated MAC 52:54:00:00:04:xx).
+ :type socket: str
+ :type server: bool
+ :type mac: str
+ """
+ self._vhost_id += 1
+ # Create unix socket character device.
+ chardev = ' -chardev socket,id=char{0},path={1}'.format(self._vhost_id,
+ socket)
+ if server is True:
+ 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)
+ 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'
+ # Create Virtio network device.
+ device = ' -device virtio-net-pci,netdev=vhost{0},mac={1},{2}'.format(
+ self._vhost_id, mac, extend_options)
+ self._qemu_opt['options'] += device
+ # Add interface MAC and socket to the node dict
+ if_data = {'mac_address': mac, 'socket': socket}
+ if_name = 'vhost{}'.format(self._vhost_id)
+ self._vm_info['interfaces'][if_name] = if_data
+ # Add socket to the socket list
+ self._socks.append(socket)
+
+ def _qemu_qmp_exec(self, cmd):
+ """Execute QMP command.
+
+ QMP is JSON based protocol which allows to control QEMU instance.
+
+ :param cmd: QMP command to execute.
+ :type cmd: str
+ :return: Command output in python representation of JSON format. The
+ { "return": {} } response is QMP's success response. An error
+ 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
+ (ret_code, stdout, stderr) = self._ssh.exec_command(qmp_cmd)
+ if int(ret_code) != 0:
+ logger.debug('QMP execute failed {0}'.format(stderr))
+ raise RuntimeError('QMP execute "{0}"'
+ ' failed on {1}'.format(cmd, self._node['host']))
+ logger.trace(stdout)
+ # Skip capabilities negotiation messages.
+ out_list = stdout.splitlines()
+ if len(out_list) < 3:
+ raise RuntimeError('Invalid QMP output on {0}'.format(
+ self._node['host']))
+ return json.loads(out_list[2])
+
+ def _qemu_qga_flush(self):
+ """Flush the QGA parser state
+ """
+ qga_cmd = 'printf "\xFF" | sudo -S nc ' \
+ '-q 1 -U ' + self.__QGA_SOCK
+ (ret_code, stdout, stderr) = self._ssh.exec_command(qga_cmd)
+ if int(ret_code) != 0:
+ logger.debug('QGA execute failed {0}'.format(stderr))
+ 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])
+
+ def _qemu_qga_exec(self, cmd):
+ """Execute QGA command.
+
+ QGA provide access to a system-level agent via standard QMP commands.
+
+ :param cmd: QGA command to execute.
+ :type cmd: str
+ """
+ qga_cmd = 'echo "{ \\"execute\\": \\"' + cmd + '\\" }" | sudo -S nc ' \
+ '-q 1 -U ' + self.__QGA_SOCK
+ (ret_code, stdout, stderr) = self._ssh.exec_command(qga_cmd)
+ if int(ret_code) != 0:
+ logger.debug('QGA execute failed {0}'.format(stderr))
+ 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])
+
+ def _wait_until_vm_boot(self, timeout=300):
+ """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).
+ :type timeout: int
+ """
+ start = time()
+ while 1:
+ 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')
+ # Empty output - VM not booted yet
+ if not out:
+ sleep(5)
+ # Non-error return - VM booted
+ elif out.get('return') is not None:
+ break
+ # Skip error and wait
+ elif out.get('error') is not None:
+ sleep(5)
+ else:
+ raise RuntimeError('QGA guest-ping unexpected output {}'.format(
+ out))
+ logger.trace('VM {0} booted on {1}'.format(self._qemu_opt['disk_image'],
+ self._node['host']))
+
+ 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')
+ mac_name = {}
+ if not interfaces:
+ raise RuntimeError('Get VM {0} interface list failed on {1}'.format(
+ self._qemu_opt['disk_image'], self._node['host']))
+ # Create MAC-name dict
+ for interface in interfaces:
+ if 'hardware-address' not in interface:
+ continue
+ mac_name[interface['hardware-address']] = interface['name']
+ # Match interface by MAC and save interface name
+ for interface in self._vm_info['interfaces'].values():
+ mac = interface.get('mac_address')
+ if_name = mac_name.get(mac)
+ if if_name is None:
+ logger.trace('Interface name for MAC {} not found'.format(mac))
+ else:
+ interface['name'] = if_name
+
+ def _huge_page_check(self, allocate=False):
+ """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))
+ # 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
+ if allocate:
+ mem_needed = abs((huge_free * huge_size) - (mem_size * 1024))
+ huge_to_allocate = ((mem_needed / huge_size) * 2) + huge_total
+ max_map_count = huge_to_allocate*4
+ # Increase maximum number of memory map areas a process may have
+ cmd = 'echo "{0}" | sudo tee /proc/sys/vm/max_map_count'.format(
+ max_map_count)
+ (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
+ # Increase hugepage count
+ cmd = 'echo "{0}" | sudo tee /proc/sys/vm/nr_hugepages'.format(
+ huge_to_allocate)
+ (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
+ if int(ret_code) != 0:
+ logger.debug('Mount huge pages failed {0}'.format(stderr))
+ raise RuntimeError('Mount huge pages failed on {0}'.format(
+ 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)
+ )
+ # Check if huge pages mount point exist
+ has_huge_mnt = False
+ (_, output, _) = self._ssh.exec_command('cat /proc/mounts')
+ for line in output.splitlines():
+ # Try to find something like:
+ # none /mnt/huge hugetlbfs rw,relatime,pagesize=2048k 0 0
+ mount = line.split()
+ if mount[2] == 'hugetlbfs' and mount[1] == huge_mnt:
+ has_huge_mnt = True
+ break
+ # If huge page mount point not exist create one
+ if not has_huge_mnt:
+ cmd = 'mkdir -p {0}'.format(huge_mnt)
+ (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
+ if int(ret_code) != 0:
+ logger.debug('Create mount dir failed: {0}'.format(stderr))
+ raise RuntimeError('Create mount dir failed on {0}'.format(
+ self._node['host']))
+ cmd = 'mount -t hugetlbfs -o pagesize=2048k none {0}'.format(
+ huge_mnt)
+ (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd)
+ if int(ret_code) != 0:
+ logger.debug('Mount huge pages failed {0}'.format(stderr))
+ raise RuntimeError('Mount huge pages failed on {0}'.format(
+ self._node['host']))
+
+ def qemu_start(self):
+ """Start QEMU and wait until VM boot.
+
+ :return: VM node info.
+ :rtype: dict
+ .. note:: First set at least node to run QEMU on.
+ .. warning:: Starts only one VM on the node.
+ """
+ # SSH forwarding
+ ssh_fwd = '-net user,hostfwd=tcp::{0}-:22'.format(
+ self._qemu_opt.get('ssh_fwd_port'))
+ # 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'))
+
+ # 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'))
+
+ # 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'))
+ # 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
+ cmd = '{0} {1} {2} {3} {4} -hda {5} {6} {7} {8} {9}'.format(
+ 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)
+ (ret_code, _, stderr) = self._ssh.exec_command_sudo(cmd, timeout=300)
+ if int(ret_code) != 0:
+ logger.debug('QEMU start failed {0}'.format(stderr))
+ raise RuntimeError('QEMU start failed on {0}'.format(
+ self._node['host']))
+ logger.trace('QEMU running')
+ # Wait until VM boot
+ self._wait_until_vm_boot()
+ # Update interface names in VM node dict
+ self._update_vm_interfaces()
+ # Return VM node dict
+ return self._vm_info
+
+ def qemu_quit(self):
+ """Quit the QEMU emulator."""
+ out = self._qemu_qmp_exec('quit')
+ err = out.get('error')
+ if err is not None:
+ raise RuntimeError('QEMU quit failed on {0}, error: {1}'.format(
+ self._node['host'], json.dumps(err)))
+
+ def qemu_system_powerdown(self):
+ """Power down the system (if supported)."""
+ 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))
+ )
+
+ 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}, '
+ 'error: {1}'.format(self._node['host'], json.dumps(err)))
+
+ def qemu_kill(self):
+ """Kill qemu process."""
+ # TODO: add PID storage so that we can kill specific PID
+ # Note: in QEMU start phase there are 3 QEMU processes because we
+ # daemonize QEMU
+ self._ssh.exec_command_sudo('pkill -SIGKILL qemu')
+
+ def qemu_clear_socks(self):
+ """Remove all sockets created by QEMU."""
+ # If serial console port still open kill process
+ cmd = 'fuser -k {}/tcp'.format(self._qemu_opt.get('serial_port'))
+ self._ssh.exec_command_sudo(cmd)
+ # Delete all created sockets
+ for sock in self._socks:
+ cmd = 'rm -f {}'.format(sock)
+ self._ssh.exec_command_sudo(cmd)
+
+ def qemu_system_status(self):
+ """Return current VM status.
+
+ VM should be in following status:
+
+ - debug: QEMU running on a debugger
+ - finish-migrate: paused to finish the migration process
+ - inmigrate: waiting for an incoming migration
+ - internal-error: internal error has occurred
+ - io-error: the last IOP has failed
+ - paused: paused
+ - postmigrate: paused following a successful migrate
+ - prelaunch: QEMU was started with -S and guest has not started
+ - restore-vm: paused to restore VM state
+ - running: actively running
+ - save-vm: paused to save the VM state
+ - shutdown: shut down (and -no-shutdown is in use)
+ - suspended: suspended (ACPI S3)
+ - watchdog: watchdog action has been triggered
+ - guest-panicked: panicked as a result of guest OS panic
+
+ :return: VM status.
+ :rtype: str
+ """
+ out = self._qemu_qmp_exec('query-status')
+ ret = out.get('return')
+ if ret is not None:
+ return ret.get('status')
+ else:
+ err = out.get('error')
+ raise RuntimeError(
+ 'QEMU query-status failed on {0}, '
+ 'error: {1}'.format(self._node['host'], json.dumps(err)))
+
@staticmethod
def build_qemu(node):
"""Build QEMU from sources.
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']))
Code Review / csit.git / blobdiff