qemu-guest-agent: init module

Allow out of band communication between qemu VMs and the host.
Useful to retrieve IPs of VMs from the host (for instance when libvirt can't analyze
DHCP requests because VMs are configured with static addresses or when
there is connectivity default).

1 files changed, 11 insertions, 0 deletions

diff --git a/nixos/modules/virtualisation/qemu-vm.nix b/nixos/modules/virtualisation/qemu-vm.nix
index 2b78276fcdea..57e25d808dc3 100644
--- a/nixos/modules/virtualisation/qemu-vm.nix
+++ b/nixos/modules/virtualisation/qemu-vm.nix
@@ -343,6 +343,15 @@ in
             (<literal>virtio</literal> or <literal>scsi</literal>).
           '';
         };
+
+      guestAgent.enable =
+        mkOption {
+          default = true;
+          type = types.bool;
+          description = ''
+            Enable the Qemu guest agent.
+          '';
+        };
     };
 
     virtualisation.useBootLoader =
@@ -494,6 +503,8 @@ in
     # Don't run ntpd in the guest.  It should get the correct time from KVM.
     services.timesyncd.enable = false;
 
+    services.qemuGuest.enable = cfg.qemu.guestAgent.enable;
+
     system.build.vm = pkgs.runCommand "nixos-vm" { preferLocalBuild = true; }
       ''
         mkdir -p $out/bin