add instructions to fix OVMF_*4M compat with libvirt

README.md

@@ -194,6 +194,14 @@ processors work just fine (even for macOS Sonoma).
 
 - (OPTIONAL) Use this macOS VM disk with libvirt (virt-manager / virsh stuff).
 
+  - Move OVMF code and vars files to `$XDG_CONFIG_HOME/libvirt/qemu/nvram` and rename var store as necessary
+    for your resolution
+    ```
+    cp OVMF_VARS-<your desired resolution>.fd OVMF_VARS.4m.fd
+    cp OVMF_CODE_4M.fd "${XDG_CONFIG_HOME}/libvirt/qemu/nvram"
+    cp OVMF_VARS.4m.fd "${XDG_CONFIG_HOME}/libvirt/qemu/nvram"
+    ```
+
   - Edit `macOS-libvirt-Catalina.xml` file and change the various file paths (search
     for `CHANGEME` strings in that file). The following command should do the
     trick usually.
@@ -210,7 +218,8 @@ processors work just fine (even for macOS Sonoma).
     virsh --connect qemu:///system define macOS.xml
     ```
 
-  - If needed, grant necessary permissions to libvirt-qemu user,
+  - If needed, grant necessary permissions to libvirt-qemu user
+    (ignore spurious "invalid argument near character 3" error if encountered),
 
     ```
     sudo setfacl -m u:libvirt-qemu:rx /home/$USER