# Copyright (c) 2016 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: # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """QEMU utilities library.""" from time import time, sleep import json from robot.api import logger 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,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': {}, } # Virtio queue count self._qemu_opt['queues'] = 1 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 -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'])) 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},'\ '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: # 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 = '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) 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(qga_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=60): """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 60s). :type timeout: int """ start = time() while True: if time() - start > timeout: raise RuntimeError('timeout, VM {0} not booted on {1}'.format( self._qemu_opt['disk_image'], self._node['host'])) 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) # 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: # 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'])) 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') # 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 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 _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. :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 try: self._wait_until_vm_boot() except RuntimeError: self.qemu_kill() self.qemu_clear_socks() raise # 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. :param node: Node to build QEMU on. :type node: dict """ ssh = SSH() ssh.connect(node) (ret_code, stdout, stderr) = \ 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 int(ret_code) != 0: logger.debug('QEMU build failed {0}'.format(stderr)) raise RuntimeError('QEMU build failed on {0}'.format(node['host']))