virtio-9p: Make infrastructure for the new security model.

This patch adds required infrastructure for the new security model.

- A new configure option for attr/xattr.
- if CONFIG_VIRTFS will be defined if both CONFIG_LINUX and CONFIG_ATTR defined.
- Defines routines related to both security models.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vl.c b/vl.c
index 43d3d0e..6f559bf 100644
--- a/vl.c
+++ b/vl.c
@@ -147,7 +147,7 @@
 #include "qemu-config.h"
 #include "qemu-objects.h"
 #include "qemu-options.h"
-#ifdef CONFIG_LINUX
+#ifdef CONFIG_VIRTFS
 #include "fsdev/qemu-fsdev.h"
 #endif
 
@@ -1532,7 +1532,7 @@
     return 0;
 }
 
-#ifdef CONFIG_LINUX
+#ifdef CONFIG_VIRTFS
 static int fsdev_init_func(QemuOpts *opts, void *opaque)
 {
     int ret;
@@ -2281,7 +2281,7 @@
                     exit(1);
                 }
                 break;
-#ifdef CONFIG_LINUX
+#ifdef CONFIG_VIRTFS
             case QEMU_OPTION_fsdev:
                 opts = qemu_opts_parse(&qemu_fsdev_opts, optarg, 1);
                 if (!opts) {
@@ -2705,7 +2705,7 @@
 
     if (qemu_opts_foreach(&qemu_chardev_opts, chardev_init_func, NULL, 1) != 0)
         exit(1);
-#ifdef CONFIG_LINUX
+#ifdef CONFIG_VIRTFS
     if (qemu_opts_foreach(&qemu_fsdev_opts, fsdev_init_func, NULL, 1) != 0) {
         exit(1);
     }