config.vm.provider (although it doesn't do anything yet)

plugins/kernel_v2/config/vm.rb

@@ -2,6 +2,7 @@ require "pathname"
 
 require "vagrant"
 
+require File.expand_path("../vm_provider", __FILE__)
 require File.expand_path("../vm_provisioner", __FILE__)
 require File.expand_path("../vm_subvm", __FILE__)
 
@@ -20,6 +21,7 @@ module VagrantPlugins
       attr_reader :forwarded_ports
       attr_reader :shared_folders
       attr_reader :networks
+      attr_reader :providers
       attr_reader :provisioners
       attr_reader :customizations
       attr_accessor :guest
@@ -28,6 +30,7 @@ module VagrantPlugins
         @forwarded_ports = []
         @shared_folders = {}
         @networks = []
+        @providers = []
         @provisioners = []
         @customizations = []
       end
@@ -71,6 +74,13 @@ module VagrantPlugins
         @networks << [type, args]
       end
 
+      # Configures a provider for this VM.
+      #
+      # @param [Symbol] name The name of the provider.
+      def provider(name)
+        @providers << VagrantConfigProvider.new(name)
+      end
+
       def provision(name, options=nil, &block)
         @provisioners << VagrantConfigProvisioner.new(name, options, &block)
       end

plugins/kernel_v2/config/vm_provider.rb

@@ -0,0 +1,17 @@
+module VagrantPlugins
+  module Kernel_V2
+    # Represents a single configured provider for a VM. This may or may
+    # not be a valid provider.
+    class VagrantConfigProvider
+      attr_reader :name
+
+      # Initializes a new provider configuration for a VM. This should
+      # only be instantiated internally by calling `config.vm.provider`.
+      #
+      # @param [Symbol] name The name of the provider that is registered.
+      def initialize(name)
+        @name = name
+      end
+    end
+  end
+end