Update and clean up modules

nixos-modules/virtualisation/default.nix

@@ -1,7 +1,6 @@
-{ ... }:
+{ config, ... }:
 {
   virtualisation = {
-    # TODO: This should probably be somewhere else.
     docker = {
       enable = true;
       enableOnBoot = false;
@@ -10,9 +9,24 @@
     spiceUSBRedirection.enable = true;
   };
 
-  boot.extraModprobeConfig = ''
-    options kvm_intel nested=1
-    options kvm_intel emulate_invalid_guest_state=0
-    options kvm ignore_msrs=1
-  '';
+  boot.extraModprobeConfig =
+    let
+      isIntel = config.hardware.cpu.intel.updateMicrocode;
+      isAmd = config.hardware.cpu.amd.updateMicrocode;
+      procName =
+        if isIntel then
+          "intel"
+        else if isAmd then
+          "amd"
+        else
+          "";
+    in
+    if isIntel || isAmd then
+      ''
+        options kvm_${procName} nested=1
+        options kvm_${procName} emulate_invalid_guest_state=0
+        options kvm ignore_msrs=1
+      ''
+    else
+      "";
 }