Add $virtio_blk to disable VirtIO Block Media

Currently only required for macOS High Sierra and Mojave

README.md

@@ -163,6 +163,8 @@ iso="${HOME}/Quickemu/macos-big-sur/disk.qcow2"
 ```
 
   * The `guest_os="macos"` line instructs Quickemu to optimise for macOS.
+  * If you want to disable VirtIO Block Media and use SATA emulation add `virtio_blk="off"` to your configuration.
+    * `quickget` disables VirtIO Block Media for High Sierra and Mojave by default since it is not supported on those releases.
 
 ### macOS compatibility
 
@@ -177,7 +179,7 @@ There are some considerations when running macOS via Quickemu.
     * Big Sur
   * Optimised by default
     * Host CPU vendor is detected and guest CPU configuration is optimised accordingly.
-    * [VirtIO block device](https://www.kraxel.org/blog/2019/06/macos-qemu-guest/) is used for the system disk (*available since macOS Mojave*).
+    * [VirtIO block device](https://www.kraxel.org/blog/2019/06/macos-qemu-guest/) is used for the system disk where supported.
     * [VirtIO `usb-tablet`](http://philjordan.eu/osx-virt/) is used for the mouse (*available since macOS El Capitan*).
     * `vmxnet3` network device is used (*available since macOS El Capitan*).
   * USB host pass-through is limited to UHCI (USB 2.0)

quickemu

@@ -498,9 +498,15 @@ function vm_boot() {
              -device ide-hd,bus=ahci.1,drive=InstallMedia)
     fi
 
-    # shellcheck disable=SC2054,SC2206
-    args+=(-drive id=SystemDisk,if=none,format=qcow2,file="${disk_img}"
-            -device virtio-blk-pci,drive=SystemDisk,scsi=off ${STATUS_QUO})
+    if [ "${virtio_blk}" == "on" ]; then
+      # shellcheck disable=SC2054
+      args+=(-device virtio-blk-pci,drive=SystemDisk,scsi=off
+             -drive id=SystemDisk,if=none,format=qcow2,file="${disk_img}" ${STATUS_QUO})
+    else
+      # shellcheck disable=SC2054,SC2206
+      args+=(-device ide-hd,bus=ahci.2,drive=SystemDisk
+             -drive id=SystemDisk,if=none,format=qcow2,file="${disk_img}" ${STATUS_QUO})
+    fi
 
     if [ -n "${fixed_iso}" ]; then
       # shellcheck disable=SC2054
@@ -601,6 +607,7 @@ iso=""
 port_forwards=()
 ram=""
 usb_devices=()
+virtio_blk="on"
 
 DELETE=0
 FULLSCREEN=""

quickget

@@ -147,6 +147,13 @@ EOF
         if [ -n "${ISO_FILE}" ]; then
             echo "fixed_iso=\"${VM_PATH}/${ISO_FILE}\"" >> "${OS}-${RELEASE}.conf"
         fi
+
+        # VirtIO Block Media doesn't work in High Sierra or Mojave so use SATA
+        case ${RELEASE} in
+            high-sierra|mojave)
+                echo "virtio_blk=\"off\"" >> "${OS}-${RELEASE}.conf"
+                ;;
+        esac
     fi
 }