builder.virtualbox.iso: document that EFI mode needs to be enabled for pcie/nvme to work too

builder/virtualbox/iso/builder.go

@@ -90,8 +90,13 @@ type Config struct {
 	// defaults to ide. When set to sata, the drive is attached to an AHCI SATA
 	// controller. When set to scsi, the drive is attached to an LsiLogic SCSI
 	// controller. When set to pcie, the drive is attached to an NVMe
-	// controller. (Please note that when you use "pcie", you'll need to have
-	// Virtualbox 6 and an [extension pack](https://www.virtualbox.org/wiki/Downloads#VirtualBox6.0.14OracleVMVirtualBoxExtensionPack))
+	// controller. Please note that when you use "pcie", you'll need to have
+	// Virtualbox 6, install an [extension
+	// pack](https://www.virtualbox.org/wiki/Downloads#VirtualBox6.0.14OracleVMVirtualBoxExtensionPack)
+	// and you will need to enable EFI mode for nvme to work, ex:
+	//   "vboxmanage": [
+	//       [ "modifyvm", "{{.Name}}", "--firmware", "EFI" ],
+	//    ]
 	HardDriveInterface string `mapstructure:"hard_drive_interface" required:"false"`
 	// The number of ports available on any SATA controller created, defaults
 	// to 1. VirtualBox supports up to 30 ports on a maximum of 1 SATA

website/source/partials/builder/virtualbox/iso/_Config-not-required.html.md

@@ -48,8 +48,13 @@
     defaults to ide. When set to sata, the drive is attached to an AHCI SATA
     controller. When set to scsi, the drive is attached to an LsiLogic SCSI
     controller. When set to pcie, the drive is attached to an NVMe
-    controller. (Please note that when you use "pcie", you'll need to have
-    Virtualbox 6 and an [extension pack](https://www.virtualbox.org/wiki/Downloads#VirtualBox6.0.14OracleVMVirtualBoxExtensionPack))
+    controller. Please note that when you use "pcie", you'll need to have
+    Virtualbox 6, install an [extension
+    pack](https://www.virtualbox.org/wiki/Downloads#VirtualBox6.0.14OracleVMVirtualBoxExtensionPack)
+    and you will need to enable EFI mode for nvme to work, ex:
+      "vboxmanage": [
+          [ "modifyvm", "{{.Name}}", "--firmware", "EFI" ],
+       ]
     
 -   `sata_port_count` (int) - The number of ports available on any SATA controller created, defaults
     to 1. VirtualBox supports up to 30 ports on a maximum of 1 SATA