From 5852bd7cd77d85128f326a19b98c09ea0ba40504 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Mon, 22 Jun 2015 17:56:35 -0700
Subject: [PATCH] builder/qemu: default acceleration to tcg on Windows
 [GH-2284]

---
 builder/qemu/builder.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/builder/qemu/builder.go b/builder/qemu/builder.go
index 46b9cabd3..4ac22b59b 100644
--- a/builder/qemu/builder.go
+++ b/builder/qemu/builder.go
@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"time"
 
@@ -153,7 +154,11 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	}
 
 	if b.config.Accelerator == "" {
-		b.config.Accelerator = "kvm"
+		if runtime.GOOS == "windows" {
+			b.config.Accelerator = "tcg"
+		} else {
+			b.config.Accelerator = "kvm"
+		}
 	}
 
 	if b.config.HTTPPortMin == 0 {