tools/xl: Add new xl command overlay for device tree overlay support

Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

tools/xl/xl.h

@@ -138,6 +138,7 @@ int main_shutdown(int argc, char **argv);
 int main_reboot(int argc, char **argv);
 int main_list(int argc, char **argv);
 int main_vm_list(int argc, char **argv);
+int main_dt_overlay(int argc, char **argv);
 int main_create(int argc, char **argv);
 int main_config_update(int argc, char **argv);
 int main_button_press(int argc, char **argv);

tools/xl/xl_cmdtable.c

@@ -631,6 +631,12 @@ const struct cmd_spec cmd_table[] = {
       "Issue a qemu monitor command to the device model of a domain",
       "<Domain> <Command>",
     },
+    { "dt-overlay",
+      &main_dt_overlay, 0, 1,
+      "Add/Remove a device tree overlay",
+      "add/remove <.dtbo>"
+      "-h print this help\n"
+    },
 };
 
 const int cmdtable_len = ARRAY_SIZE(cmd_table);

tools/xl/xl_vmcontrol.c

@@ -1265,6 +1265,58 @@ int main_create(int argc, char **argv)
     return 0;
 }
 
+int main_dt_overlay(int argc, char **argv)
+{
+    const char *overlay_ops = NULL;
+    const char *overlay_config_file = NULL;
+    void *overlay_dtb = NULL;
+    int rc;
+    uint8_t op;
+    int overlay_dtb_size = 0;
+    const int overlay_add_op = 1;
+    const int overlay_remove_op = 2;
+
+    if (argc < 2) {
+        help("dt_overlay");
+        return EXIT_FAILURE;
+    }
+
+    overlay_ops = argv[1];
+    overlay_config_file = argv[2];
+
+    if (strcmp(overlay_ops, "add") == 0)
+        op = overlay_add_op;
+    else if (strcmp(overlay_ops, "remove") == 0)
+        op = overlay_remove_op;
+    else {
+        fprintf(stderr, "Invalid dt overlay operation\n");
+        return EXIT_FAILURE;
+    }
+
+    if (overlay_config_file) {
+        rc = libxl_read_file_contents(ctx, overlay_config_file,
+                                      &overlay_dtb, &overlay_dtb_size);
+
+        if (rc) {
+            fprintf(stderr, "failed to read the overlay device tree file %s\n",
+                    overlay_config_file);
+            free(overlay_dtb);
+            return ERROR_FAIL;
+        }
+    } else {
+        fprintf(stderr, "overlay dtbo file not provided\n");
+        return ERROR_FAIL;
+    }
+
+    rc = libxl_dt_overlay(ctx, overlay_dtb, overlay_dtb_size, op);
+
+    free(overlay_dtb);
+
+    if (rc)
+        return EXIT_FAILURE;
+
+    return rc;
+}
 /*
  * Local variables:
  * mode: C