From 87691a5747539f65332ec1bb940c11fa6201efa2 Mon Sep 17 00:00:00 2001
From: Val Packett <val@invisiblethingslab.com>
Date: Fri, 28 Nov 2025 01:54:58 -0300
Subject: [PATCH] Do not wait for udev to settle

Relying on udev to assign permissions to the virtgpu was very "proper"
but really excessive. We have a simple static configuration, built into
the kernel, so there are no dynamic shenanigans, we can always reliably
just chmod/chown the permissions. Let's go back to faster booting.
---
 nixosModules/default.nix | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/nixosModules/default.nix b/nixosModules/default.nix
index 03e3cea..a114b3a 100644
--- a/nixosModules/default.nix
+++ b/nixosModules/default.nix
@@ -170,21 +170,6 @@ in {
     serviceConfig.ExecStart = "/opt/bin/muvm-pwbridge";
   };
 
-  systemd.services.wait-for-udev = {
-    enable = true;
-    description = "Wait for device rules being applied";
-    wantedBy = ["microvm.target"];
-    requires = ["systemd-udevd.service"];
-    after = ["systemd-udevd.service"];
-    serviceConfig = {
-      Type = "oneshot";
-      ExecStart = [
-        "udevadm trigger --action=add"
-        "udevadm settle"
-      ];
-    };
-  };
-
   systemd.sockets.wayland-proxy-virtwl = {
     enable = true;
     description = "Wayland cross-domain proxy socket";
@@ -200,9 +185,9 @@ in {
   systemd.services.wayland-proxy-virtwl = {
     enable = true;
     description = "Wayland cross-domain proxy";
-    after = ["wait-for-udev.service"];
-    requires = ["wayland-proxy-virtwl.socket" "wait-for-udev.service"];
+    requires = ["wayland-proxy-virtwl.socket"];
     serviceConfig = {
+      ExecStartPre = "+/run/current-system/sw/bin/chmod 0666 /dev/dri/card0 /dev/dri/renderD128";
       ExecStart = "${virtwl.packages.${pkgs.system}.proxy}/bin/wayland-proxy-virtwl --virtio-gpu";
       Environment = ["XDG_RUNTIME_DIR=${runtimeDir}"];
       User = "appvm";