configure: Default KVM to disabled on ARM hosts

Default KVM to disabled for ARM hosts -- it is still experimental.

This patch will be dropped when the code is ready to go upstream.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/configure b/configure
index 5074a63..fcf7166 100755
--- a/configure
+++ b/configure
@@ -473,7 +473,13 @@
   linux="yes"
   linux_user="yes"
   usb="linux"
-  kvm="yes"
+  if [ "$cpu" = "arm" ]; then
+    # default to disabled unless requested by user via --enable-kvm
+    # while this is still experimental
+    kvm="no"
+  else
+    kvm="yes"
+  fi
   vhost_net="yes"
   if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
     audio_possible_drivers="$audio_possible_drivers fmod"