Add 'RAM_reservation' parameter

README.md

@@ -62,6 +62,7 @@ Hardware customization:
 * `CPU_reservation` - Amount of reserved CPU resources in MHz. Inherited from source VM by default.
 * `CPU_limit` - Upper limit of available CPU resources in MHz. Inherited from source VM by default, set to `-1` for reset.
 * `RAM` - Amount of RAM in megabytes. Inherited from source VM by default.
+* `RAM_reservation` - Amount of reserved RAM in MB. Inherited from source VM by default.
 
 Provisioning:
 * `ssh_username` - [**mandatory**] username in guest OS.
@@ -103,6 +104,7 @@ Post-processing:
       "CPU_reservation": 1000,
       "CPU_limit": 2000,
       "RAM": 8192,
+      "RAM_reservation": 2048,
 
       "ssh_username": "root",
       "ssh_password": "{{user `guest_password`}}",

step_hardware.go

@@ -13,6 +13,7 @@ type HardwareConfig struct {
 	CPUReservation int64 `mapstructure:"CPU_reservation"`
 	CPULimit       int64 `mapstructure:"CPU_limit"`
 	RAM            int64 `mapstructure:"RAM"`
+	RAMReservation int64 `mapstructure:"RAM_reservation"`
 }
 
 type StepConfigureHardware struct {
@@ -36,6 +37,10 @@ func (s *StepConfigureHardware) Run(state multistep.StateBag) multistep.StepActi
 		cpuSpec.Limit = s.config.CPULimit
 		confSpec.CpuAllocation = &cpuSpec
 
+		var ramSpec types.ResourceAllocationInfo
+		ramSpec.Reservation = s.config.RAMReservation
+		confSpec.MemoryAllocation = &ramSpec
+
 		task, err := vm.Reconfigure(ctx, confSpec)
 		if err != nil {
 			state.Put("error", err)