Add ability to control nested hardware virtualization

Issue: #45

README.md

@@ -65,6 +65,7 @@ Hardware customization:
 * `RAM_reservation` - Amount of reserved RAM in MB. Inherited from source VM by default.
 * `RAM_reserve_all` - Reserve all available RAM (bool). `false` by default. Cannot be used together with `RAM_reservation`.
 * `disk_size` - Change the disk size (in GB). VM should have a single disk. Cannot be used together with `linked_clone`.
+* `NestedHV` - Allows to enable nested hardware virtualization for VM.
 
 Provisioning:
 * `ssh_username` - [**mandatory**] username in guest OS.

driver/vm.go

@@ -31,6 +31,7 @@ type HardwareConfig struct {
 	RAMReservation int64
 	RAMReserveAll  bool
 	DiskSize       int64
+	NestedHV       bool
 }
 
 func (d *Driver) NewVM(ref *types.ManagedObjectReference) *VirtualMachine {
@@ -165,6 +166,7 @@ func (vm *VirtualMachine) Configure(config *HardwareConfig) error {
 	confSpec.MemoryAllocation = &ramSpec
 
 	confSpec.MemoryReservationLockedToMax = &config.RAMReserveAll
+	confSpec.NestedHVEnabled = &config.NestedHV
 
 	if config.DiskSize > 0 {
 		devices, err := vm.vm.Device(vm.driver.ctx)

step_hardware.go

@@ -15,6 +15,7 @@ type HardwareConfig struct {
 	RAMReservation int64 `mapstructure:"RAM_reservation"`
 	RAMReserveAll  bool  `mapstructure:"RAM_reserve_all"`
 	DiskSize       int64 `mapstructure:"disk_size"`
+	NestedHV       bool  `mapstructure:"NestedHV"`
 }
 
 func (c *HardwareConfig) Prepare() []error {
@@ -46,6 +47,7 @@ func (s *StepConfigureHardware) Run(state multistep.StateBag) multistep.StepActi
 			RAMReservation: s.config.RAMReservation,
 			RAMReserveAll:  s.config.RAMReserveAll,
 			DiskSize:       s.config.DiskSize,
+			NestedHV:       s.config.NestedHV,
 		})
 		if err != nil {
 			state.Put("error", err)