nixos-config: add live MMC system and extract commons

nixos-configuration/common/steveej-live-usb/boot.nix

@@ -0,0 +1,47 @@
+{ config, lib, pkgs, ... }:
+
+{
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+
+  # Bootloader, initrd and Kernel
+  boot.loader.grub = {
+    enable = true;
+    enableCryptodisk = true;
+    version = 2;
+  };
+
+  boot.initrd.availableKernelModules = [ 
+    "xhci_pci"
+    "ahci"
+    "usb_storage"
+    "sd_mod"
+    "rtsx_pci_sdmmc"
+    "aes_x86_64"
+    "aesni_intel"
+    "cryptd"
+  ];
+
+  boot.kernelModules = [ 
+    "kvm-intel"
+
+    # Workaround for nm-pptp to enforce module load
+    "nf_conntrack_proto_gre"
+    "nf_conntrack_pptp"
+  ];
+
+  boot.extraModprobeConfig = ''
+    options kvm-intel nested=1
+    options kvm-intel enable_shadow_vmcs=1
+    options kvm-intel enable_apicv=1
+    options kvm-intel ept=1
+  '';
+  boot.extraModulePackages = [ ];
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = false; 
+
+  # workaround to disable CPU wining
+  # current CPU has 9 idle cstates.
+
+  boot.tmpOnTmpfs = true;
+}