Add vfio stuff for win10

Add a whole bunch of stuff to start/stop displays for the win10 vm
Hopefully this will allow win10 to directly use the same GPU in passthru
mode

pkgs/qemu-hook.nix

@@ -0,0 +1,31 @@
+{
+  writeShellApplication,
+  vfio_shutdown,
+  vfio_startup,
+}:
+
+writeShellApplication {
+  name = "qemu_hook";
+  runtimeInputs = [
+    vfio_shutdown
+    vfio_startup
+  ];
+
+  text = ''
+    OBJECT="''${1}"
+    OPERATION="''${2}"
+
+    if [[ "''${OBJECT}" == "win10" ]]; then
+      case "''${OPERATION}" in
+        "prepare")
+          systemctl start libvirt-nosleep@"''${OBJECT}".service
+          systemctl start bluetooth.service
+          vfio_startup 2>&1 | tee -a /var/log/qemu_hook.log
+          ;;
+        "release")
+          systemctl stop libvirt-nosleep@"''${OBJECT}".service
+          vfio_shutdown 2>&1 | tee -a /var/log/qemu_hook.log
+      esac
+    fi
+  '';
+}