tools/xl: add available Xenstore features to xl info output

Add the Xenstore feature value to the output of "xl info" in order to
prepare for a future capability to limit Xenstore features visible by
a guest.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>

tools/xl/Makefile

@@ -13,6 +13,7 @@ LDFLAGS += $(PTHREAD_LDFLAGS)
 
 CFLAGS_XL += $(CFLAGS_libxenlight)
 CFLAGS_XL += $(CFLAGS_libxenutil)
+CFLAGS_XL += $(CFLAGS_libxenstore)
 CFLAGS_XL += -Wshadow
 
 XL_OBJS-$(CONFIG_X86) = xl_psr.o
@@ -32,7 +33,7 @@ $(XL_OBJS): CFLAGS += -include $(XEN_ROOT)/tools/config.h # libxl_json.h needs i
 all: xl
 
 xl: $(XL_OBJS)
-	$(CC) $(LDFLAGS) -o $@ $(XL_OBJS) $(LDLIBS_libxenutil) $(LDLIBS_libxenlight) $(LDLIBS_libxentoollog) -lyajl $(APPEND_LDFLAGS)
+	$(CC) $(LDFLAGS) -o $@ $(XL_OBJS) $(LDLIBS_libxenutil) $(LDLIBS_libxenlight) $(LDLIBS_libxentoollog) $(LDLIBS_libxenstore) -lyajl $(APPEND_LDFLAGS)
 
 .PHONY: install
 install: all

tools/xl/xl_info.c

@@ -28,6 +28,7 @@
 #include <libxl_utils.h>
 #include <libxlutil.h>
 #include <xen-tools/arm-arch-capabilities.h>
+#include <xenstore.h>
 
 #include "xl.h"
 #include "xl_utils.h"
@@ -333,6 +334,25 @@ static void output_topologyinfo(void)
     return;
 }
 
+static void output_xenstore_info(void)
+{
+    struct xs_handle *xsh;
+    unsigned int features = 0;
+
+    xsh = xs_open(0);
+    if (!xsh) {
+        fprintf(stderr, "xs_open failed.\n");
+        return;
+    }
+
+    /* Ignore error, default to "0" for features. */
+    xs_get_features_supported(xsh, &features);
+
+    maybe_printf("xenstore_features      : 0x%08x\n", features);
+
+    xs_close(xsh);
+}
+
 static void print_info(int numa)
 {
     output_nodeinfo();
@@ -345,6 +365,8 @@ static void print_info(int numa)
     }
     output_xeninfo();
 
+    output_xenstore_info();
+
     maybe_printf("xend_config_format     : 4\n");
 
     return;