Enable hardware acceleration

This will speed up the build process. Multiple accelerators are added
and QEMU will automatically pick the one it can use.

openbsd.pkr.hcl

@@ -137,7 +137,7 @@ source "qemu" "qemu" {
   headless = var.headless
   use_default_display = var.use_default_display
   display = var.display
-  accelerator = var.accelerator
+  accelerator = "none"
   qemu_binary = "qemu-system-${local.qemu_architecture}"
   firmware = var.firmware
 
@@ -162,6 +162,9 @@ source "qemu" "qemu" {
   qemuargs = [
     ["-cpu", var.cpu_type],
     ["-boot", "strict=off"],
+    ["-accel", "hvf"],
+    ["-accel", "kvm"],
+    ["-accel", "tcg"],
     ["-monitor", "none"],
     ["-vga", "cirrus"],
     ["-device", "virtio-blk-pci,drive=drive0,bootindex=0"],

var_files/arm64.pkrvars.hcl

@@ -1,4 +1,5 @@
 architecture = "arm64"
-machine_type = "virt"
+machine_type = "virt,highmem=off" // highmem=off if reqiured for enabling hardware acceleration on Apple Silicon
 cpu_type = "cortex-a57"
 firmware = "resources/qemu_efi.fd"
+memory = 3072 // max memory when hardware acceleration on Apple Silicon is enabled