Class: PackerFiles::Virtual::KVM

Inherits:
Utils::HashSerializer show all
Includes:
Utils::Size
Defined in:
lib/PackerFiles/Virtual/KVM.rb

Overview

Abstraction for KVM(QEMU) builder in Packer. Refer to Packer.io documentation on more details on the various variables for QEMU ISO Builder.

Instance Method Summary collapse

Methods included from Utils::Size

#Bytes, #MiB

Methods inherited from Utils::HashSerializer

hash_attributes, hash_variable, #merge_hs, #to_hash

Constructor Details

#initialize {|_self| ... } ⇒ KVM

Constructor. Supports the standard block semantics via yield

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/PackerFiles/Virtual/KVM.rb', line 55

def initialize(&block)
   self.type = 'qemu'
   yield self if block_given?
end

Instance Method Details

#Hypervisor(hyper, amd64 = true) ⇒ Object

Given an Hypervisor object, convert into a list of qemuargs commands



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# File 'lib/PackerFiles/Virtual/KVM.rb', line 61

def Hypervisor(hyper, amd64=true)

  # Allocate a new array to store values.
  value = Array.new

  # If CPU hot plug is enabled, then current cpu count < max cpu count
  count = hyper.cpu_count.to_s 
  if (hyper.cpu_hot_plug)
     value << ["-smp", "cpus=#{count},maxcpus=255"]
  else
     value << ["-smp", "cpus=#{count},maxcpus=#{count}"]
  end
 
  # NOTE: CPU Execution Cap is not implemented in KVM
  # NOTE: Video RAM Size is not implemented in KVM

  # RAM Size is always translated into MiB
  value << ["-m", MiB(hyper.ram_size).to_s]

  # Memory Balloon size is ignored by KVM. It is just enabling or
  # disabling a feature.
  if MiB(hyper.guest_balloon_size) > 0
     value << ["-balloon", "none"]
  else
     value << ["-balloon", "virtio"]
  end

  # ACPI is by default enabled on KVM. We just have to handle the 
  # disabled case.
  if !hyper.acpi_enabled
     value << ["-no-acpi"]
  end

  # We have to use EFI firmware for virtual machines, if it has been
  # asked for.
  if hyper.use_efi
     value << ["-bios", "/usr/share/ovmf/OVMF.fd"]
  end

  # KVM works very differently w.r.t. CPU features. First a base CPU 
  # (64 bit or 32 bit) has to be selected and then more features need
  # to be added.
  cpu_features  =   (amd64)?'qemu64':'qemu32'
  cpu_features  +=  ',+pae'   if hyper.pae_enabled 
  cpu_features  +=  ',+vmx'   if hyper.hw_virt_enabled
  cpu_features  +=  ',+npt'   if hyper.hw_nested_pages
  cpu_features  +=  ',+pse36' if hyper.use_large_pages
  cpu_features  +=  ',+hypervisor' if hyper.unrestricted_guest_mode
  value << ["-cpu", cpu_features]

  # Set the value for QEMU Args
  self.qemuargs = value
end