Switch from BIOS and GRUB to UEFI and systemd-boot for Proxmox VMs

config/nixos-generators/proxmox.nix

@@ -2,6 +2,7 @@
 # - https://github.com/NixOS/nixpkgs/blob/069de7d3deafab651fd627c8f6d7e4c7b33087a2/nixos/modules/virtualisation/proxmox-image.nix#L6
 # - https://git.grzb.de/yuri/nix-infra/-/blob/aa38daeea59f2ca12b7e591de6f8b61565780c48/configuration/nixos-generators/default.nix#L13
 # - https://git.grzb.de/yuri/nix-infra/-/blob/aa38daeea59f2ca12b7e591de6f8b61565780c48/flake.nix#L39
+# - https://pve.proxmox.com/wiki/Manual:_qm.conf
 
 { config, pkgs, ... }:
 
@@ -12,11 +13,12 @@
       cores = 2;
       memory = 512;
       virtio0 = "rpool-data:vm-9999-disk-0,discard=on";
-      bios = "seabios";
+      bios = "ovmf";
       net0 = "virtio=00:00:00:00:00:00,bridge=vmbr0,firewall=1,tag=999";
     };
     qemuExtraConf = {
       cpu = "cputype=host,flags=+aes";
+      machine = "q35";
       template = 1;
     };
   };

config/proxmox-vm/boot.nix

@@ -2,8 +2,9 @@
 # Sources for this configuration:
 # - a generated NixOS 23.05 configuration
 # - https://github.com/NixOS/nixpkgs/blob/069de7d3deafab651fd627c8f6d7e4c7b33087a2/nixos/modules/virtualisation/proxmox-image.nix#L241
+# - https://nixos.org/manual/nixos/stable/#sec-installation-manual-installing
 
-{ config, pkgs, ... }:
+{ config, pkgs, lib, ... }:
 
 {
   boot = {
@@ -12,19 +13,20 @@
     # Not specified here:
     # - boot.kernelModules
     # - boot.extraModulePackages
-    # Please specify as needed.
+    # Please specify as needed elsewhere.
 
     # Grow the root partition on boot.
     growPartition = true;
 
     kernelParams = [ "console=ttyS0" ];
 
-    loader.grub = {
+    loader.systemd-boot = {
       enable = true;
-      # TODO: Can we use "/dev/disk/by-label/nixos" here?
-      device = "/dev/vda";
+      editor = false;
     };
 
-    loader.timeout = 0;
+    loader.efi.efiSysMountPoint = "/boot";
+
+    loader.timeout = lib.mkForce 2;
   };
 }

config/proxmox-vm/storage.nix

@@ -12,6 +12,11 @@
     fsType = "ext4";
   };
 
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-label/ESP";
+    fsType = "vfat";
+  };
+
   # Not specified here:
   # - swapDevices
   # If needed, manually specify it elsewhere.