Revert "nixos: doc: implement related packages in the manual"

nixos/modules/virtualisation/xen-dom0.nix

@@ -35,19 +35,24 @@ in
       description = ''
         The package used for Xen binary.
       '';
-      relatedPackages = [ "xen" "xen-light" ];
     };
 
-    virtualisation.xen.package-qemu = mkOption {
+    virtualisation.xen.qemu = mkOption {
+      type = types.path;
+      defaultText = "\${pkgs.xen}/lib/xen/bin/qemu-system-i386";
+      example = literalExample "''${pkgs.qemu_xen-light}/bin/qemu-system-i386";
+      description = ''
+        The qemu binary to use for Dom-0 backend.
+      '';
+    };
+
+    virtualisation.xen.qemu-package = mkOption {
       type = types.package;
       defaultText = "pkgs.xen";
       example = literalExample "pkgs.qemu_xen-light";
       description = ''
-        The package with qemu binaries for dom0 qemu and xendomains.
+        The package with qemu binaries for xendomains.
       '';
-      relatedPackages = [ "xen"
-                          { name = "qemu_xen-light"; comment = "For use with pkgs.xen-light."; }
-                        ];
     };
 
     virtualisation.xen.bootParams =
@@ -153,7 +158,8 @@ in
     } ];
 
     virtualisation.xen.package = mkDefault pkgs.xen;
-    virtualisation.xen.package-qemu = mkDefault pkgs.xen;
+    virtualisation.xen.qemu = mkDefault "${pkgs.xen}/lib/xen/bin/qemu-system-i386";
+    virtualisation.xen.qemu-package = mkDefault pkgs.xen;
     virtualisation.xen.stored = mkDefault "${cfg.package}/bin/oxenstored";
 
     environment.systemPackages = [ cfg.package ];
@@ -333,8 +339,7 @@ in
       after = [ "xen-console.service" ];
       requires = [ "xen-store.service" ];
       serviceConfig.ExecStart = ''
-        ${cfg.package-qemu}/${cfg.package-qemu.qemu-system-i386} \
-           -xen-attach -xen-domid 0 -name dom0 -M xenpv \
+        ${cfg.qemu} -xen-attach -xen-domid 0 -name dom0 -M xenpv \
            -nographic -monitor /dev/null -serial /dev/null -parallel /dev/null
         '';
     };
@@ -443,7 +448,7 @@ in
       before = [ "dhcpd.service" ];
       restartIfChanged = false;
       serviceConfig.RemainAfterExit = "yes";
-      path = [ cfg.package cfg.package-qemu ];
+      path = [ cfg.package cfg.qemu-package ];
       environment.XENDOM_CONFIG = "${cfg.package}/etc/sysconfig/xendomains";
       preStart = "mkdir -p /var/lock/subsys -m 755";
       serviceConfig.ExecStart = "${cfg.package}/etc/init.d/xendomains start";