Add 'args' as optional configuration parameter when creating a VM

.web-docs/components/builder/clone/README.md

@@ -272,6 +272,10 @@ boot time.
 - `vm_interface` (string) - Name of the network interface that Packer gets
   the VMs IP from. Defaults to the first non loopback interface.
 
+- `qemu_additional_args` (string) - Arbitrary arguments passed to KVM.
+  For example `-no-reboot -smbios type=0,vendor=FOO`.
+  Note: this option is for experts only.
+
 <!-- End of code generated from the comments of the Config struct in builder/proxmox/common/config.go; -->
 
 

.web-docs/components/builder/iso/README.md

@@ -203,6 +203,10 @@ in the image's Cloud-Init settings for provisioning.
 - `vm_interface` (string) - Name of the network interface that Packer gets
   the VMs IP from. Defaults to the first non loopback interface.
 
+- `qemu_additional_args` (string) - Arbitrary arguments passed to KVM. 
+  For example `-no-reboot -smbios type=0,vendor=FOO`.
+  Note: this option is for experts only.
+
 <!-- End of code generated from the comments of the Config struct in builder/proxmox/common/config.go; -->
 
 

builder/proxmox/common/config.go

@@ -191,6 +191,11 @@ type Config struct {
 	// the VMs IP from. Defaults to the first non loopback interface.
 	VMInterface string `mapstructure:"vm_interface"`
 
+	// Arbitrary arguments passed to KVM.
+	// For example `-no-reboot -smbios type=0,vendor=FOO`.
+	// 	Note: this option is for experts only.
+	AdditionalArgs string `mapstructure:"qemu_additional_args"`
+
 	Ctx interpolate.Context `mapstructure-to-hcl2:",skip"`
 }
 

builder/proxmox/common/step_start_vm.go

@@ -133,6 +133,7 @@ func (s *stepStartVM) Run(ctx context.Context, state multistep.StateBag) multist
 		QemuSerials:    generateProxmoxSerials(c.Serials),
 		Scsihw:         c.SCSIController,
 		Onboot:         &c.Onboot,
+		Args:           c.AdditionalArgs,
 	}
 
 	// 0 disables the ballooning device, which is useful for all VMs