Enable nosv system feature

m/common/base.nix

@@ -11,6 +11,7 @@
     ./base/hw.nix
     ./base/net.nix
     ./base/nix.nix
+    ./base/nosv.nix
     ./base/ntp.nix
     ./base/rev.nix
     ./base/ssh.nix

m/common/base/nosv.nix

@@ -0,0 +1,9 @@
+{ ... }:
+{
+  nix.settings.system-features = [ "nosv" ];
+  programs.nix-required-mounts.enable = true;
+  programs.nix-required-mounts.allowedPatterns.nosv.paths = [
+    "/sys/devices/system/cpu"
+    "/sys/devices/system/node"
+  ];
+}