From a431a96df9727752b50ae23125855d4569b92207 Mon Sep 17 00:00:00 2001
From: Russell O'Connor <oconnorr@google.com>
Date: Tue, 12 Aug 2014 20:30:46 +0200
Subject: [PATCH] Allow QEMU to fallback to full simulation if /dev/kvm is not
 available.

---
 pkgs/applications/virtualization/qemu/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/applications/virtualization/qemu/default.nix b/pkgs/applications/virtualization/qemu/default.nix
index 176d196b064..1d668c4a28c 100644
--- a/pkgs/applications/virtualization/qemu/default.nix
+++ b/pkgs/applications/virtualization/qemu/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
       # Add a ‘qemu-kvm’ wrapper for compatibility/convenience.
       p="$out/bin/qemu-system-${if stdenv.system == "x86_64-linux" then "x86_64" else "i386"}"
       if [ -e "$p" ]; then
-        makeWrapper "$p" $out/bin/qemu-kvm --add-flags "-enable-kvm"
+        makeWrapper "$p" $out/bin/qemu-kvm --add-flags "\$([ -e /dev/kvm ] && echo -enable-kvm)"
       fi
     '';