[libvirt] [PATCH] Avoid warning message from libxl driver on non-Xen kernels

[Daniel P. Berrange]

The libxl driver reads /proc/xen/capabilities to see if it
is on a Dom0 kernel. If that file does not even exist though,
an error is logged. Check for the file existance before trying
to read its contents to avoid the log message.

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/libxl/libxl_driver.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index ae7342a..445a61a 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -970,6 +970,10 @@ libxlDriverShouldLoad(bool privileged)
         return ret;
     }
 
+    if (!virFileExists("/proc/xen/capabilities")) {
+        VIR_INFO("Disabling driver as /proc/xen/capabilities does not exist");
+        return false;
+    }
     /*
      * Don't load if not running on a Xen control domain (dom0). It is not
      * sufficient to check for the file to exist as any guest can mount
-- 
1.8.5.3