diff --git a/examples/dummy.nix b/examples/dummy.nix
index 4689af1..7d8c813 100644
--- a/examples/dummy.nix
+++ b/examples/dummy.nix
@@ -13,6 +13,8 @@
 
   system.stateVersion = "25.11";
 
+  networking.hostName = "dummy";
+
   vmapps.enable = true;
   _module.args.inputs = import ../npins;
 
diff --git a/pkgs/taps/main.c b/pkgs/taps/main.c
index 05edb64..3b276df 100644
--- a/pkgs/taps/main.c
+++ b/pkgs/taps/main.c
@@ -1,5 +1,6 @@
 #define _GNU_SOURCE
 
+#include <stdio.h>
 #include <stdlib.h> /* secure_getenv */
 #include <sys/socket.h>
 #include <unistd.h>
@@ -15,10 +16,12 @@
 #include <errno.h>
 #include <sys/ioctl.h>
 #include <signal.h>
+#include <fcntl.h>
 
 #define __UAPI_DEF_IF_IFNAMSIZ 1
 #include <linux/if_tun.h>
 #include <linux/if.h>
+#include <linux/virtio_net.h>
 
 #include "sendfd.h"
 
@@ -108,6 +111,11 @@ int tuntap_alloc(char *dev, short openFlags, short ifrFlags, int *out_fd) {
 
   strncpy(dev, ifr.ifr_name, IFNAMSIZ);
   *out_fd = fd;
+
+  {
+      int sz = sizeof(struct virtio_net_hdr_v1);
+      DO_OR_DIE(ioctl(fd, TUNSETVNETHDRSZ, &sz));
+  }
   return 0;
 }
 
@@ -257,6 +265,13 @@ void cleanup(int signo, siginfo_t *info, void *_context) {
     errx(EXIT_FAILURE, "Exiting with signal %d", signo);
 }
 
+/* skarlibs under ISC */
+int uncoe (int fd)
+{
+  int flags = fcntl(fd, F_GETFD, 0) ;
+  return flags < 0 ? flags : flags & FD_CLOEXEC ? fcntl(fd, F_SETFD, flags & ~FD_CLOEXEC) : 0 ;
+}
+
 int main(int argc, char **argv) {
     struct sigaction act = { 0 };
     act.sa_flags = SA_SIGINFO;
@@ -266,7 +281,7 @@ int main(int argc, char **argv) {
 
     bool cmdServe = false;
     bool cmdPass = false;
-    char *ifname = "vt%d";
+    char *ifname = "vt-%d";
 
     char **rest = argv + 1;
     char **end = argv + argc;
@@ -303,7 +318,7 @@ int main(int argc, char **argv) {
 
     const char *servePath = secure_getenv("TAPS_SOCK");
     if (servePath == NULL) {
-        servePath = "taps.sock";
+        servePath = "/run/taps/taps.sock";
     }
 
     if (cmdServe) {
@@ -317,6 +332,7 @@ int main(int argc, char **argv) {
             close(fd);
             fd = 3;
         }
+        uncoe(fd);
         DO_OR_DIE(execvp(nextArgv[0], nextArgv));
     } else {
         error(EINVAL, EINVAL, "subcommand args");
diff --git a/profiles/ch-runner.nix b/profiles/ch-runner.nix
index fbb09a4..f680354 100644
--- a/profiles/ch-runner.nix
+++ b/profiles/ch-runner.nix
@@ -10,21 +10,107 @@
 
 let
   cfg = config.uvms.cloud-hypervisor;
+
+  inherit (config.networking) hostName;
   inherit (config.debug.closure.erofs) layers;
+  inherit (lib) mkOption types;
+
+  package = pkgs.cloud-hypervisor.overrideAttrs (oldAttrs: {
+    patches = oldAttrs.patches or [ ] ++ [
+      # ../patches/ch.patch
+    ];
+    buildType = "debug";
+    dontStrip = true;
+  });
+  uvmsPkgs = pkgs.callPackage ../pkgs { };
+
+  chSettingsFile = (pkgs.formats.json { }).generate "vm.json" cfg.settings;
+
+  uvmPrefix = "\${HOME}/uvms/${hostName}";
+  vmmSock = "${uvmPrefix}/vmm.sock";
+  pastaSock = "${uvmPrefix}/pasta.sock";
+  pastaPidPath = "${uvmPrefix}/pasta.pid";
+  elbPrefix = "${lib.getBin pkgs.execline}/bin";
+  s6Prefix = "${lib.getBin pkgs.s6}/bin";
+  writeElb = name: text: writeElb' name "-W" text;
+  writeElb' =
+    name: elArgs: text:
+    pkgs.writeTextFile {
+      inherit name;
+      destination = "/bin/${name}";
+      executable = true;
+      text = ''
+        #!${lib.getExe' pkgs.execline "execlineb"}${lib.optionalString (elArgs != null) " "}${elArgs}
+        importas OLDPATH PATH
+        export PATH "${elbPrefix}:${s6Prefix}:''${OLDPATH}"
+        ${text}
+      '';
+    };
 in
 {
   options = {
     uvms.cloud-hypervisor.enable = lib.mkEnableOption "Configure guest (e.g. fileSystems)";
-    uvms.cloud-hypervisor.runner = lib.mkOption {
-      type = lib.types.package;
+    uvms.cloud-hypervisor.runner = mkOption {
+      type = types.package;
       description = "A naive script for running this system in cloud-hypervisor";
     };
-    uvms.cloud-hypervisor.extraArgv = lib.mkOption {
-      type = lib.types.listOf lib.types.str;
-      default = [ ];
+    uvms.cloud-hypervisor.debugger = mkOption {
+      type = types.lazyAttrsOf types.anything;
+      description = "Same but you can debug the kernel";
     };
-    uvms.cloud-hypervisor.argv = lib.mkOption {
-      type = lib.types.listOf lib.types.str;
+    uvms.cloud-hypervisor.settingsFile = mkOption {
+      type = types.package;
+      default = chSettingsFile;
+      defaultText = "...";
+      readOnly = true;
+    };
+    uvms.cloud-hypervisor.settings = mkOption {
+      default = { };
+      type = types.submodule {
+        freeformType = (pkgs.formats.json { }).type;
+        options = {
+          payload = {
+            cmdline = mkOption { type = types.str; };
+            kernel = mkOption { type = types.str; };
+            initramfs = mkOption {
+              type = types.str;
+              default = "${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}";
+            };
+          };
+          vsock = {
+            cid = mkOption {
+              type = types.int;
+              default = 4;
+            };
+            socket = mkOption {
+              type = types.str;
+              default = "vsock.sock";
+            };
+          };
+          "api-socket" = mkOption {
+            type = types.str;
+            default = "vmm.sock";
+          };
+          "serial".mode = mkOption {
+            type = types.str;
+            default = "File";
+          };
+          "serial".file = mkOption {
+            type = types.nullOr types.str;
+            default = "serial";
+          };
+          "console".mode = mkOption {
+            type = types.str;
+            default = "Pty";
+          };
+          "console".file = mkOption {
+            type = types.nullOr types.str;
+            default = null;
+          };
+          # "watchdog" = true;
+          # "seccomp" = true;
+        };
+      };
     };
     uvms.cloud-hypervisor.extraCmdline = lib.mkOption {
       type = lib.types.listOf lib.types.str;
@@ -45,33 +131,178 @@ in
   };
   config = lib.mkMerge [
     {
-      uvms.cloud-hypervisor.argv = lib.mkBefore (
-        [
-          (lib.getExe pkgs.cloud-hypervisor)
-          "--cmdline=${lib.concatStringsSep " " cfg.cmdline}"
-          "--kernel=${config.boot.kernelPackages.kernel}/${pkgs.stdenv.hostPlatform.linux-kernel.target}"
-          "--initramfs=${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}"
-          "--vsock=cid=4,socket=vsock.sock"
-          "--api-socket=vmm.sock"
-          "--serial=tty"
-          "--console=null"
-          "--watchdog"
-          "--seccomp=true"
-        ]
-        ++ cfg.extraArgv
-      );
-      uvms.cloud-hypervisor.runner = pkgs.writeShellScriptBin "run-${config.networking.hostName}" ''
-        set -euo pipefail
-        GUESTNAME=${config.networking.hostName}
-        args=(
-        ${lib.concatMapStringsSep "\n" lib.escapeShellArg cfg.argv}
-        )
-        mkdir -p "$HOME/uvms/$GUESTNAME"
-        cd "$HOME/uvms/$GUESTNAME"
-        cleanup() {
-            rm "$HOME/uvms/$GUESTNAME"/{vmm,vsock}.sock
+      uvms.cloud-hypervisor.settings = {
+        payload = {
+          cmdline = lib.concatStringsSep " " cfg.cmdline;
+          kernel = "${config.boot.kernelPackages.kernel}/${pkgs.stdenv.hostPlatform.linux-kernel.target}";
+        };
+        disks = map (img: {
+          path = img;
+          readonly = true;
+          id = toString img.label;
+        }) layers;
+        memory = {
+          size = 1536 * 1048576;
+          shared = true;
+          mergeable = true;
+          # hotplugged_size = 512 * 1048576;
+          # hotplugd_size = 1536 * 1048576;
+          # hotplug_method = "virtio-mem"
+        };
+        cpus = {
+          boot_vcpus = 4;
+          max_vcpus = 4;
+        };
+      };
+
+      uvms.cloud-hypervisor.debugger = pkgs.testers.runNixOSTest (
+        { config, ... }:
+        {
+          name = "test-run-${hostName}";
+          passthru = rec {
+            inherit (config.nodes.machine.system.build) gdbScript;
+            inherit (config.nodes.machine.boot.kernelPackages) kernel;
+            kernelSrc = pkgs.srcOnly kernel;
+          };
+          nodes.machine =
+            { config, ... }:
+            let
+              kernel = config.boot.kernelPackages.kernel;
+              kernelSrc = pkgs.srcOnly kernel;
+              gdbScript = writeElb "attach-gdb" ''
+                if { rm -rf /tmp/gdb }
+                if { mkdir -p /tmp/gdb/kos }
+                cd /tmp/gdb
+                if {
+                    elglob -0 files ${kernelSrc}/*
+                    forx -E f { $files }
+                    ln -s $f ./
+                }
+                if { mkdir -p build }
+                cd build
+                if {
+                    forx -E pattern { 
+                        ${kernel.modules}/lib/modules/*/kernel/drivers/net/tun*
+                        ${kernel.modules}/lib/modules/*/kernel/drivers/net/tap*
+                    }
+                    elglob -0 files $pattern
+                    forx -E f { $files }
+                    if { cp $f . }
+                    backtick -E COMPRESSED { basename $f }
+                    xz -d $COMPRESSED
+                }
+                elglob -0 GDB_SCRIPT_DIR ${lib.getDev kernel}/lib/modules/*/build/scripts/gdb
+                if {
+                    if { cp -r --no-preserve=all $GDB_SCRIPT_DIR gdb_scripts }
+                    mv gdb_scripts/linux/constants.py.in gdb_scripts/linux/constants.py
+                }
+                ${lib.getExe pkgs.gdb}
+                -ex "python import sys; sys.path.insert(0, \"''${GDB_SCRIPT_DIR}\")"
+                -ex "target remote :1234"
+                -ex "source ''${GDB_SCRIPT_DIR}/vmlinux-gdb.py"
+                -ex "lx-symbols"
+                ${kernel.dev}/vmlinux
+              '';
+            in
+            {
+              boot.kernelPackages = pkgs.linuxPackagesFor (
+                (pkgs.linux.override (oldArgs: {
+                  # extraMakeFlags = oldArgs.extraMakeFlags or [ ] ++ [
+                  #   "scripts_gdb"
+                  # ];
+                  kernelPatches = oldArgs.kernelPatches or [ ] ++ [
+                    {
+                      name = "debug";
+                      patch = null;
+                      structuredExtraConfig = {
+                        GDB_SCRIPTS = lib.kernel.yes;
+                        DEBUG_INFO = lib.kernel.yes;
+                        DEBUG_INFO_REDUCED = lib.kernel.no;
+                        # FRAME_POINTER = lib.kernel.yes; # "unused option"???
+                        KALLSYMS = lib.kernel.yes;
+                        KGDB = lib.kernel.yes;
+                      };
+                    }
+                  ];
+                })).overrideAttrs
+                  (oldAttrs: {
+                    dontStrip = true;
+                    postInstall = oldAttrs.postInstall or "" + ''
+                      cp "$buildRoot/scripts/gdb/linux/constants.py" $dev/lib/modules/*/build/scripts/gdb/linux/ || echo "$buildRoot/scripts/gdb/linux/constants.py doesn't exist"
+                    '';
+                  })
+              );
+              boot.kernelParams = [ "nokaslr" ];
+              networking.useNetworkd = true;
+              virtualisation.qemu.options = [ "-s" ];
+              environment.systemPackages = [
+                pkgs.gdb
+                package # CH
+                cfg.runner
+                uvmsPkgs.taps
+              ];
+              system.build.gdbScript = gdbScript;
+              systemd.services.taps = {
+                wantedBy = [ "multi-user.target" ];
+                environment.TAPS_SOCK = "/run/taps/taps.sock";
+                serviceConfig = {
+                  UMask = "0007";
+                  ExecStart = "${lib.getExe uvmsPkgs.taps} serve";
+                  RuntimeDirectory = "taps";
+                  DynamicUser = true;
+                  AmbientCapabilities = [
+                    "CAP_NET_BIND_SERVICE"
+                    "CAP_NET_ADMIN"
+                  ];
+                  NoNewPrivileges = true;
+                };
+              };
+            };
+          testScript = ''
+            machine.succeed("${lib.getExe cfg.runner}")
+          '';
         }
-        exec -a "uuvm/$GUESTNAME" "''${args[@]}"
+      );
+
+      # NOTE: Used to be an even uglier bash script, but, for now, execline makes for easier comparisons against spectrum
+      uvms.cloud-hypervisor.runner = writeElb "run-${hostName}" ''
+        importas -i HOME HOME
+        importas -SsD ${lib.getExe' pkgs.passt "passt"} PASST
+        importas -SsD ${lib.getExe package} CH
+        importas -SsD "${lib.getExe' package "ch-remote"} --api-socket=${vmmSock}" CHR
+        foreground { mkdir -p "${uvmPrefix}" "${uvmPrefix}" }
+        cd "${uvmPrefix}"
+        background {
+            s6-ipcserver-socketbinder -B ${vmmSock}
+            trap { default { foreground { s6-ipcclient -q ${uvmPrefix}/cleanup.sock true } exit } }
+            fdmove -c 3 0
+            redirfd -r 0 /dev/null
+            exec -a "uuvm/${hostName} cloud-hypervisor" $CH --api-socket fd=3
+        }
+        importas CH_PID !
+        background {
+            s6-ipcserver-socketbinder -B ${pastaSock}
+            s6-ipcserverd
+            trap { default { foreground { s6-ipcclient -q ${uvmPrefix}/cleanup.sock true } exit } }
+            exec -a "uuvm/${hostName} passt" $PASST --vhost-user -fF 0
+        }
+        importas PASST_PID !
+        background {
+            getpid -E CLEANUP_PID
+            s6-ipcserver-socketbinder -B "${uvmPrefix}/cleanup.sock"
+            s6-ipcserverd
+            foreground { kill $CH_PID $PASST_PID }
+            foreground {
+                rm -f ${vmmSock} ${uvmPrefix}/vsock.sock
+            }
+            kill $CLEANUP_PID
+        }
+        trap { default { foreground { s6-ipcclient -q ${uvmPrefix}/cleanup.sock true } exit } }
+        if { $CHR create ${chSettingsFile} }
+        # if { $CHR add-net "vhost_user=on,socket=${pastaSock}" }
+        if { ${lib.getExe uvmsPkgs.taps} pass $CHR add-net "id=wan,fd=3,mac=00:00:00:00:00:01" }
+        if { $CHR boot }
+        if { $CHR info }
       '';
     }
     (lib.mkIf cfg.enable {
@@ -103,12 +334,6 @@ in
           }
         ) layers
       );
-      uvms.cloud-hypervisor.argv = [
-        "--memory=size=1536M,hotplug_size=1536M,hotplugged_size=512M,hotplug_method=virtio-mem,mergeable=on,shared=on"
-        "--cpus=boot=4"
-        "--disk"
-      ]
-      ++ map (img: "path=${img},readonly=true,id=${toString img.label}") layers;
     })
   ];
 }