Class: Dcmgr::Drivers::Kvm

Inherits:
Hypervisor show all
Includes:
Helpers::CliHelper, Helpers::NicHelper, Logger, Rpc::KvmHelper
Defined in:
lib/dcmgr/drivers/kvm.rb

Instance Method Summary collapse

Methods included from Helpers::NicHelper

#find_nic, #nic_state, #valid_nic?

Methods included from Rpc::KvmHelper

#connect_monitor

Methods included from Helpers::CliHelper

#sh, #tryagain

Methods included from Logger

create, default_logdev, included

Methods inherited from Hypervisor

select_hypervisor

Instance Method Details

#attach_volume_to_guest(hc) ⇒ Object 



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# File 'lib/dcmgr/drivers/kvm.rb', line 52

def attach_volume_to_guest(hc)
  # pci_devddr consists of three hex numbers with colon separator.
  #  dom <= 0xffff && bus <= 0xff && val <= 0x1f
  # see: qemu-0.12.5/hw/pci.c
  # /*
  # * Parse [[<domain>:]<bus>:]<slot>, return -1 on error
  # */
  # static int pci_parse_devaddr(const char *addr, int *domp, int *busp, unsigned *slotp)
  pci_devaddr = nil
  inst = hc.inst

  sddev = File.expand_path(File.readlink(hc.os_devpath), '/dev/disk/by-path')
  connect_monitor(inst[:runtime_config][:telnet_port]) { |t|
    # success message:
    #   OK domain 0, bus 0, slot 4, function 0
    # error message:
    #   failed to add file=/dev/xxxx,if=virtio
    c = t.cmd("pci_add auto storage file=#{sddev},if=scsi")
    # Note: pci_parse_devaddr() called in "pci_add" uses strtoul()
    # with base 16 so that the input is expected in hex. however
    # at the result display, void pci_device_hot_add_print() uses
    # %d for showing bus and slot addresses. use hex to preserve
    # those values to keep consistent.
    if c =~ /\nOK domain ([0-9a-fA-F]+), bus ([0-9a-fA-F]+), slot ([0-9a-fA-F]+), function/m
      # numbers in OK result is decimal. convert them to hex.
      pci_devaddr = [$1, $2, $3].map{|i| i.to_i.to_s(16) }
    else
      raise "Error in qemu console: #{c}"
    end

    # double check the pci address.
    c = t.cmd("info pci")

    # static void pci_info_device(PCIBus *bus, PCIDevice *d)
    # called in "info pci" gets back PCI bus info with %d.
    if c.split(/\n/).grep(/^\s+Bus\s+#{pci_devaddr[1].to_i(16)}, device\s+#{pci_devaddr[2].to_i(16)}, function/).empty?
      raise "Could not find new disk device attached to qemu-kvm: #{pci_devaddr.join(':')}"
    end
  }
  pci_devaddr.join(':')
end

#detach_volume_from_guest(hc) ⇒ Object 



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# File 'lib/dcmgr/drivers/kvm.rb', line 94

def detach_volume_from_guest(hc)
  inst = hc.inst
  vol = hc.vol
  pci_devaddr = vol[:guest_device_name]

  connect_monitor(inst[:runtime_config][:telnet_port]) { |t|
    t.cmd("pci_del #{pci_devaddr}")
    #
    #  Bus  0, device   4, function 0:
    #    SCSI controller: PCI device 1af4:1001
    #      IRQ 0.
    #      BAR0: I/O at 0x1000 [0x103f].
    #      BAR1: 32 bit memory at 0x08000000 [0x08000fff].
    #      id ""
    c = t.cmd("info pci")
    pci_devaddr = pci_devaddr.split(':')
    unless c.split(/\n/).grep(/\s+Bus\s+#{pci_devaddr[1].to_i(16)}, device\s+#{pci_devaddr[2].to_i(16)}, function/).empty?
      raise "Detached disk device still be attached in qemu-kvm: #{pci_devaddr.join(':')}"
    end
  }
end

#reboot_instance(hc) ⇒ Object 



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# File 'lib/dcmgr/drivers/kvm.rb', line 45

def reboot_instance(hc)
  inst = hc.inst
  connect_monitor(inst[:runtime_config][:telnet_port]) { |t|
    t.cmd("system_reset")
  }
end

#run_instance(hc) ⇒ Object 



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# File 'lib/dcmgr/drivers/kvm.rb', line 9

def run_instance(hc)
  # run vm
  inst = hc.inst
  cmd = "kvm -m %d -smp %d -name vdc-%s -vnc :%d -drive file=%s -pidfile %s -daemonize -monitor telnet::%d,server,nowait"
  args=[inst[:instance_spec][:memory_size],
        inst[:instance_spec][:cpu_cores],
        inst[:uuid],
        inst[:runtime_config][:vnc_port],
        hc.os_devpath,
        File.expand_path('kvm.pid', hc.inst_data_dir),
        inst[:runtime_config][:telnet_port]
       ]
  if vnic = inst[:instance_nics].first
    cmd += " -net nic,macaddr=%s -net tap,ifname=%s,script=,downscript="
    args << vnic[:mac_addr].unpack('A2'*6).join(':')
    args << vnic[:uuid]
  end
  sh(cmd, args)

  unless vnic.nil?
    sh("/sbin/ifconfig %s 0.0.0.0 up", [vnic[:uuid]])
    sh("/usr/sbin/brctl addif %s %s", [hc.bridge_if, vnic[:uuid]])
  end

  sleep 1
end

#terminate_instance(hc) ⇒ Object 



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# File 'lib/dcmgr/drivers/kvm.rb', line 36

def terminate_instance(hc)
  kvm_pid=`pgrep -u root -f vdc-#{hc.inst_id}`
  if $?.exitstatus == 0 && kvm_pid.to_s =~ /^\d+$/
    sh("/bin/kill #{kvm_pid}")
  else
    logger.error("Can not find the KVM process. Skipping: kvm -name vdc-#{hc.inst_id}")
  end
end