x86: document tsc_native configuration option in xmexample.hvm.

Set the default value to 1

Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>

diff --git a/tools/examples/xmexample.hvm b/tools/examples/xmexample.hvm
index 5f43337007bf5b41a3914537f17d29050f947125..e5ae97f966aa8648b8164ecf880101485a85d180 100644 (file)
--- a/tools/examples/xmexample.hvm
+++ b/tools/examples/xmexample.hvm
@@ -177,6 +177,12 @@ stdvga=0
 #   then xm console or minicom can connect
 serial='pty'
 
+#----------------------------------------------------------------------------
+#   tsc_native : TSC mode (0=emulate TSC, 1=native TSC)
+#   emulate TSC provides synced TSC for all vcpus, but lose perfomrance.
+#   native TSC leverages hardware's TSC(no perf loss), but vcpu's TSC may lose
+#   sync due to hardware's unreliable/unsynced TSC between CPUs.
+tsc_native=1
 
 #-----------------------------------------------------------------------------
 #   Qemu Monitor, default is disable