diff --git a/builder/amazon/common/artifact.go b/builder/amazon/common/artifact.go
index 455994d59..8831d313b 100644
--- a/builder/amazon/common/artifact.go
+++ b/builder/amazon/common/artifact.go
@@ -52,6 +52,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("AMIs were created:\n\n%s", strings.Join(amiStrings, "\n"))
 }
 
+func (a *Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *Artifact) Destroy() error {
 	errors := make([]error, 0)
 
diff --git a/builder/digitalocean/artifact.go b/builder/digitalocean/artifact.go
index 527713e94..3f756a05d 100644
--- a/builder/digitalocean/artifact.go
+++ b/builder/digitalocean/artifact.go
@@ -37,6 +37,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("A snapshot was created: '%v' in region '%v'", a.snapshotName, a.regionName)
 }
 
+func (a *Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *Artifact) Destroy() error {
 	log.Printf("Destroying image: %d (%s)", a.snapshotId, a.snapshotName)
 	return a.client.DestroyImage(a.snapshotId)
diff --git a/builder/docker/artifact_export.go b/builder/docker/artifact_export.go
index 29cbefb48..d9eb83f67 100644
--- a/builder/docker/artifact_export.go
+++ b/builder/docker/artifact_export.go
@@ -27,6 +27,10 @@ func (a *ExportArtifact) String() string {
 	return fmt.Sprintf("Exported Docker file: %s", a.path)
 }
 
+func (a *ExportArtifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *ExportArtifact) Destroy() error {
 	return os.Remove(a.path)
 }
diff --git a/builder/docker/artifact_import.go b/builder/docker/artifact_import.go
index 4c926eb53..6ab0fe482 100644
--- a/builder/docker/artifact_import.go
+++ b/builder/docker/artifact_import.go
@@ -28,6 +28,10 @@ func (a *ImportArtifact) String() string {
 	return fmt.Sprintf("Imported Docker image: %s", a.Id())
 }
 
+func (*ImportArtifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *ImportArtifact) Destroy() error {
 	return a.Driver.DeleteImage(a.Id())
 }
diff --git a/builder/googlecompute/artifact.go b/builder/googlecompute/artifact.go
index a09946f9f..cb2ad88bb 100644
--- a/builder/googlecompute/artifact.go
+++ b/builder/googlecompute/artifact.go
@@ -37,3 +37,7 @@ func (a *Artifact) Id() string {
 func (a *Artifact) String() string {
 	return fmt.Sprintf("A disk image was created: %v", a.imageName)
 }
+
+func (a *Artifact) State(name string) interface{} {
+	return nil
+}
diff --git a/builder/null/artifact_export.go b/builder/null/artifact_export.go
index ad7bebc15..3962358e0 100644
--- a/builder/null/artifact_export.go
+++ b/builder/null/artifact_export.go
@@ -24,6 +24,10 @@ func (a *NullArtifact) String() string {
 	return fmt.Sprintf("Did not export anything. This is the null builder")
 }
 
+func (a *NullArtifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *NullArtifact) Destroy() error {
 	return nil
 }
diff --git a/builder/openstack/artifact.go b/builder/openstack/artifact.go
index 131f1a481..f55ff8727 100644
--- a/builder/openstack/artifact.go
+++ b/builder/openstack/artifact.go
@@ -36,6 +36,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("An image was created: %v", a.ImageId)
 }
 
+func (a *Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *Artifact) Destroy() error {
 	log.Printf("Destroying image: %d", a.ImageId)
 	return a.Conn.DeleteImageById(a.ImageId)
diff --git a/builder/parallels/common/artifact.go b/builder/parallels/common/artifact.go
index 4930e0c32..8ce7755fa 100644
--- a/builder/parallels/common/artifact.go
+++ b/builder/parallels/common/artifact.go
@@ -66,6 +66,10 @@ func (a *artifact) String() string {
 	return fmt.Sprintf("VM files in directory: %s", a.dir)
 }
 
+func (a *artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *artifact) Destroy() error {
 	return os.RemoveAll(a.dir)
 }
diff --git a/builder/qemu/artifact.go b/builder/qemu/artifact.go
index a3f1f9a46..ac841df08 100644
--- a/builder/qemu/artifact.go
+++ b/builder/qemu/artifact.go
@@ -8,8 +8,9 @@ import (
 // Artifact is the result of running the Qemu builder, namely a set
 // of files associated with the resulting machine.
 type Artifact struct {
-	dir string
-	f   []string
+	dir  string
+	f    []string
+	state map[string]interface{}
 }
 
 func (*Artifact) BuilderId() string {
@@ -28,6 +29,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("VM files in directory: %s", a.dir)
 }
 
+func (a *Artifact) State(name string) interface{} {
+	return a.state[name]
+}
+
 func (a *Artifact) Destroy() error {
 	return os.RemoveAll(a.dir)
 }
diff --git a/builder/qemu/builder.go b/builder/qemu/builder.go
index 79c2aa5ce..63ef873c0 100644
--- a/builder/qemu/builder.go
+++ b/builder/qemu/builder.go
@@ -502,8 +502,14 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 	artifact := &Artifact{
 		dir: b.config.OutputDir,
 		f:   files,
+		state: make(map[string]interface{}),
 	}
 
+	artifact.state["diskName"] = state.Get("disk_filename").(string)
+	artifact.state["diskType"] = b.config.Format
+	artifact.state["diskSize"] = uint64(b.config.DiskSize)
+	artifact.state["domainType"] = b.config.Accelerator
+
 	return artifact, nil
 }
 
diff --git a/builder/qemu/step_create_disk.go b/builder/qemu/step_create_disk.go
index 7545a19f0..0f51110d0 100644
--- a/builder/qemu/step_create_disk.go
+++ b/builder/qemu/step_create_disk.go
@@ -16,8 +16,8 @@ func (s *stepCreateDisk) Run(state multistep.StateBag) multistep.StepAction {
 	config := state.Get("config").(*config)
 	driver := state.Get("driver").(Driver)
 	ui := state.Get("ui").(packer.Ui)
-	path := filepath.Join(config.OutputDir, fmt.Sprintf("%s.%s", config.VMName,
-		strings.ToLower(config.Format)))
+	name := config.VMName + "." + strings.ToLower(config.Format)
+	path := filepath.Join(config.OutputDir, name)
 
 	command := []string{
 		"create",
@@ -38,6 +38,8 @@ func (s *stepCreateDisk) Run(state multistep.StateBag) multistep.StepAction {
 		return multistep.ActionHalt
 	}
 
+	state.Put("disk_filename", name)
+
 	return multistep.ActionContinue
 }
 
diff --git a/builder/virtualbox/common/artifact.go b/builder/virtualbox/common/artifact.go
index f4fc48100..9755c7a44 100644
--- a/builder/virtualbox/common/artifact.go
+++ b/builder/virtualbox/common/artifact.go
@@ -56,6 +56,10 @@ func (a *artifact) String() string {
 	return fmt.Sprintf("VM files in directory: %s", a.dir)
 }
 
+func (a *artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *artifact) Destroy() error {
 	return os.RemoveAll(a.dir)
 }
diff --git a/builder/vmware/common/artifact.go b/builder/vmware/common/artifact.go
index ddc2b1a35..710ed9aad 100644
--- a/builder/vmware/common/artifact.go
+++ b/builder/vmware/common/artifact.go
@@ -56,6 +56,10 @@ func (a *localArtifact) String() string {
 	return fmt.Sprintf("VM files in directory: %s", a.dir)
 }
 
+func (a *localArtifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *localArtifact) Destroy() error {
 	return os.RemoveAll(a.dir)
 }
diff --git a/builder/vmware/iso/artifact.go b/builder/vmware/iso/artifact.go
index d6ddf8921..d0e1a6d8b 100644
--- a/builder/vmware/iso/artifact.go
+++ b/builder/vmware/iso/artifact.go
@@ -28,6 +28,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("VM files in directory: %s", a.dir)
 }
 
+func (a *Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *Artifact) Destroy() error {
 	return a.dir.RemoveAll()
 }
diff --git a/packer/artifact.go b/packer/artifact.go
index 486c322f6..8eaf3bcd5 100644
--- a/packer/artifact.go
+++ b/packer/artifact.go
@@ -25,6 +25,10 @@ type Artifact interface {
 	// This is used for UI output. It can be multiple lines.
 	String() string
 
+	// State allows the caller to ask for builder specific state information
+	// relating to the artifact instance.
+	State(name string) interface{}
+
 	// Destroy deletes the artifact. Packer calls this for various reasons,
 	// such as if a post-processor has processed this artifact and it is
 	// no longer needed.
diff --git a/packer/artifact_mock.go b/packer/artifact_mock.go
index a59af5331..18f4e562f 100644
--- a/packer/artifact_mock.go
+++ b/packer/artifact_mock.go
@@ -5,6 +5,7 @@ type MockArtifact struct {
 	BuilderIdValue string
 	FilesValue     []string
 	IdValue        string
+	StateValues    map[string]interface{}
 	DestroyCalled  bool
 }
 
@@ -37,6 +38,11 @@ func (*MockArtifact) String() string {
 	return "string"
 }
 
+func (a *MockArtifact) State(name string) interface{} {
+	value, _ := a.StateValues[name]
+	return value
+}
+
 func (a *MockArtifact) Destroy() error {
 	a.DestroyCalled = true
 	return nil
diff --git a/packer/artifact_test.go b/packer/artifact_test.go
index ab6f39fb4..4ddc5f0ac 100644
--- a/packer/artifact_test.go
+++ b/packer/artifact_test.go
@@ -2,6 +2,7 @@ package packer
 
 type TestArtifact struct {
 	id            string
+	state         map[string]interface{}
 	destroyCalled bool
 }
 
@@ -26,6 +27,11 @@ func (*TestArtifact) String() string {
 	return "string"
 }
 
+func (a *TestArtifact) State(name string) interface{} {
+	value, _ := a.state[name]
+	return value
+}
+
 func (a *TestArtifact) Destroy() error {
 	a.destroyCalled = true
 	return nil
diff --git a/packer/rpc/artifact.go b/packer/rpc/artifact.go
index c6e0a208d..3532cfbad 100644
--- a/packer/rpc/artifact.go
+++ b/packer/rpc/artifact.go
@@ -38,6 +38,11 @@ func (a *artifact) String() (result string) {
 	return
 }
 
+func (a *artifact) State(name string) (result interface{}) {
+	a.client.Call(a.endpoint+".State", name, &result)
+	return
+}
+
 func (a *artifact) Destroy() error {
 	var result error
 	if err := a.client.Call(a.endpoint+".Destroy", new(interface{}), &result); err != nil {
@@ -67,6 +72,11 @@ func (s *ArtifactServer) String(args *interface{}, reply *string) error {
 	return nil
 }
 
+func (s *ArtifactServer) State(name string, reply *interface{}) error {
+	*reply = s.artifact.State(name)
+	return nil
+}
+
 func (s *ArtifactServer) Destroy(args *interface{}, reply *error) error {
 	err := s.artifact.Destroy()
 	if err != nil {
diff --git a/packer/rpc/client.go b/packer/rpc/client.go
index fcc15fe56..c2523868e 100644
--- a/packer/rpc/client.go
+++ b/packer/rpc/client.go
@@ -40,8 +40,11 @@ func newClientWithMux(mux *muxBroker, streamId uint32) (*Client, error) {
 		return nil, err
 	}
 
-	var h codec.MsgpackHandle
-	clientCodec := codec.GoRpc.ClientCodec(clientConn, &h)
+	h := &codec.MsgpackHandle{
+		RawToString: true,
+		WriteExt:    true,
+	}
+	clientCodec := codec.GoRpc.ClientCodec(clientConn, h)
 
 	return &Client{
 		mux:      mux,
diff --git a/packer/rpc/server.go b/packer/rpc/server.go
index 764f7c72e..a8b4e2a15 100644
--- a/packer/rpc/server.go
+++ b/packer/rpc/server.go
@@ -148,8 +148,11 @@ func (s *Server) Serve() {
 	}
 	defer stream.Close()
 
-	var h codec.MsgpackHandle
-	rpcCodec := codec.GoRpc.ServerCodec(stream, &h)
+	h := &codec.MsgpackHandle{
+		RawToString: true,
+		WriteExt:    true,
+	}
+	rpcCodec := codec.GoRpc.ServerCodec(stream, h)
 	s.server.ServeCodec(rpcCodec)
 }
 
diff --git a/post-processor/compress/artifact.go b/post-processor/compress/artifact.go
index 54985d529..34a7ce8d6 100644
--- a/post-processor/compress/artifact.go
+++ b/post-processor/compress/artifact.go
@@ -35,6 +35,10 @@ func (self *Artifact) String() string {
 	return fmt.Sprintf("'%s' compressing: %s", self.Provider, self.Path)
 }
 
+func (*Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (self *Artifact) Destroy() error {
 	return os.Remove(self.Path)
 }
diff --git a/post-processor/vagrant-cloud/artifact.go b/post-processor/vagrant-cloud/artifact.go
index 775bc2998..9f1d4f4bd 100644
--- a/post-processor/vagrant-cloud/artifact.go
+++ b/post-processor/vagrant-cloud/artifact.go
@@ -34,6 +34,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("'%s': %s", a.Provider, a.Tag)
 }
 
+func (*Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *Artifact) Destroy() error {
 	return nil
 }
diff --git a/post-processor/vagrant/artifact.go b/post-processor/vagrant/artifact.go
index c4cfe394b..5974e9901 100644
--- a/post-processor/vagrant/artifact.go
+++ b/post-processor/vagrant/artifact.go
@@ -35,6 +35,10 @@ func (a *Artifact) String() string {
 	return fmt.Sprintf("'%s' provider box: %s", a.Provider, a.Path)
 }
 
+func (a *Artifact) State(name string) interface{} {
+	return nil
+}
+
 func (a *Artifact) Destroy() error {
 	return os.Remove(a.Path)
 }
diff --git a/post-processor/vagrant/libvirt.go b/post-processor/vagrant/libvirt.go
new file mode 100644
index 000000000..6ab0b3900
--- /dev/null
+++ b/post-processor/vagrant/libvirt.go
@@ -0,0 +1,64 @@
+package vagrant
+
+import (
+	"fmt"
+	"github.com/mitchellh/packer/packer"
+	"path/filepath"
+	"strings"
+)
+
+type LibVirtProvider struct{}
+
+func (p *LibVirtProvider) KeepInputArtifact() bool {
+	return false
+}
+func (p *LibVirtProvider) Process(ui packer.Ui, artifact packer.Artifact, dir string) (vagrantfile string, metadata map[string]interface{}, err error) {
+	diskName := artifact.State("diskName").(string)
+
+	// Copy the disk image into the temporary directory (as box.img)
+	for _, path := range artifact.Files() {
+		if strings.HasSuffix(path, "/"+diskName) {
+			ui.Message(fmt.Sprintf("Copying from artifact: %s", path))
+			dstPath := filepath.Join(dir, "box.img")
+			if err = CopyContents(dstPath, path); err != nil {
+				return
+			}
+		}
+	}
+
+	format := artifact.State("diskType").(string)
+	origSize := artifact.State("diskSize").(uint64)
+	size := origSize / 1024 // In MB, want GB
+	if origSize % 1024 > 0 {
+		// Make sure we don't make the size smaller
+		size++
+	}
+	domainType := artifact.State("domainType").(string)
+
+	// Convert domain type to libvirt driver
+	var driver string
+	switch domainType {
+	case "kvm", "qemu":
+		driver = domainType
+	default:
+		return "", nil, fmt.Errorf("Unknown libvirt domain type: %s", domainType)
+	}
+
+	// Create the metadata
+	metadata = map[string]interface{}{
+		"provider":     "libvirt",
+		"format":       format,
+		"virtual_size": size,
+	}
+
+	vagrantfile = fmt.Sprintf(libvirtVagrantfile, driver)
+	return
+}
+
+var libvirtVagrantfile = `
+Vagrant.configure("2") do |config|
+  config.vm.provider :libvirt do |libvirt|
+    libvirt.driver = "%s"
+  end
+end
+`
diff --git a/post-processor/vagrant/post-processor.go b/post-processor/vagrant/post-processor.go
index 1365a3c3d..60690b936 100644
--- a/post-processor/vagrant/post-processor.go
+++ b/post-processor/vagrant/post-processor.go
@@ -23,6 +23,7 @@ var builtins = map[string]string{
 	"pearkes.digitalocean":      "digitalocean",
 	"packer.parallels":          "parallels",
 	"MSOpenTech.hyperv":         "hyperv",
+	"transcend.qemu":            "libvirt",
 }
 
 type Config struct {
@@ -228,6 +229,8 @@ func providerForName(name string) Provider {
 		return new(ParallelsProvider)
 	case "hyperv":
 		return new(HypervProvider)
+	case "libvirt":
+		return new(LibVirtProvider)
 	default:
 		return nil
 	}
diff --git a/website/source/docs/post-processors/vagrant.html.markdown b/website/source/docs/post-processors/vagrant.html.markdown
index ab4ca2f86..d5be196a6 100644
--- a/website/source/docs/post-processors/vagrant.html.markdown
+++ b/website/source/docs/post-processors/vagrant.html.markdown
@@ -32,6 +32,7 @@ providers.
 * DigitalOcean
 * Hyper-V
 * Parallels
+* QEMU
 * VirtualBox
 * VMware