lib/runners/openvmm: init

Author: astro

flake.nix

@@ -99,7 +99,8 @@
                 crosvm-example
                 kvmtool-example
                 stratovirt-example
-                # alioth-example
+                alioth-example
+                openvmm-example
                 virtiofsd
               ];
               pathsToLink = [ "/" ];
@@ -159,6 +160,8 @@
               "qemu"
               # currently broken:
               # "crosvm"
+              # not implemented:
+              # "openvmm"
             ];
             hypervisorsWithUserNet = [ "qemu" "kvmtool" ];
             makeExample = { system, hypervisor, config ? {} }:

lib/default.nix

@@ -8,6 +8,7 @@ rec {
     "kvmtool"
     "stratovirt"
     "alioth"
+    "openvmm"
   ];
 
   hypervisorsWithNetwork = hypervisors;

lib/runners/openvmm.nix

@@ -0,0 +1,72 @@
+{ pkgs
+, microvmConfig
+, macvtapFds
+}:
+
+let
+  inherit (pkgs) lib;
+  inherit (microvmConfig)
+    user
+    vcpu mem interfaces volumes shares devices vsock
+    kernel initrdPath
+    storeDisk storeOnDisk;
+in {
+  command =
+    if user != null
+    then throw "openvmm will not change user"
+    else builtins.concatStringsSep " " (
+      [
+        "${pkgs.openvmm}/bin/openvmm"
+        "-m" "${toString mem}M"
+        "-p" (toString vcpu)
+        "-k" (lib.escapeShellArg "${kernel.dev}/vmlinux")
+        "-r" initrdPath
+        "-c" (lib.escapeShellArg "console=ttyS0 reboot=k panic=1 verbose ${toString microvmConfig.kernelParams}")
+        # "--vmbus-redirect"
+        "--hv"
+        # "--virtio-console"
+        "--virtio-serial" "stderr"
+        "--guest-watchdog"
+      ]
+      ++
+      lib.optionals storeOnDisk [
+        "--disk" (lib.escapeShellArg "file:${storeDisk},ro")
+      ]
+      ++
+      builtins.concatMap ({ image, ... }:
+        [ "--disk" (lib.escapeShellArg "file:${image},uh") ]
+      ) volumes
+      ++
+      builtins.concatMap ({ proto, source, tag, ... }:
+        {
+          virtiofs = [
+            "--virtio-fs" (lib.escapeShellArg "${tag}:${source}")
+          ];
+          "9p" = [
+            "--virtio-9p" (lib.escapeShellArg "${tag}:${source}")
+          ];
+        }.${proto}
+      ) shares
+      ++
+      builtins.concatMap ({ type, id, mac, ... }:
+        if type == "tap"
+        then [
+          "--virtio-net" "tap"
+        ]
+          # TODO: --nic
+        else throw "interface type ${type} is not supported by openvmm"
+      ) interfaces
+      ++
+      map ({ ... }:
+        throw "PCI/USB passthrough is not supported on openvmm"
+      ) devices
+      ++ (
+        if vsock.cid != null
+        then throw "Host-native AF_VSOCK is not supported by openvmm"
+        else []
+      )
+    );
+
+  # TODO:
+  canShutdown = false;
+}