nix/manifest.nix

@@ -6,6 +6,7 @@ let
         device = "/dev/sda1";
         fsType = "ext4";
       };
+      nixpkgs.hostPlatform = "x86_64-linux";
       boot.loader.systemd-boot.enable = true;
       networking = { inherit hostName; };
     };

nix/modules/machine/platform.nix

@@ -1,14 +0,0 @@
-{ config, ... }:
-{
-  flake.modules.nixos.default =
-    { hostName, ... }:
-    let
-      inherit (config.flake.manifest.hosts.nixos.${hostName}.machine) platform;
-      arch = if platform == "amd" || platform == "intel" then "x86_64" else "aarch64";
-    in
-    {
-      hardware.cpu.${platform}.updateMicrocode = true;
-      boot.kernelModules = [ "kvm-${platform}" ];
-      nixpkgs.hostPlatform = "${arch}-linux";
-    };
-}