Signed-off-by: Vikram Garhwal <fnu.vik...@xilinx.com>
---
tools/include/libxl.h | 3 ++
tools/libs/light/Makefile | 1 +
tools/libs/light/libxl_overlay.c | 67 ++++++++++++++++++++++++++++++++
3 files changed, 71 insertions(+)
create mode 100644 tools/libs/light/libxl_overlay.c
diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 51a9b6cfac..b31e17c2ce 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -2419,6 +2419,9 @@ libxl_device_pci *libxl_device_pci_list(libxl_ctx *ctx,
uint32_t domid,
int *num);
void libxl_device_pci_list_free(libxl_device_pci* list, int num);
+int libxl_dt_overlay(libxl_ctx *ctx, void *overlay,
+ int overlay_size, uint8_t overlay_op);
+
/*
* Turns the current process into a backend device service daemon
* for a driver domain.
diff --git a/tools/libs/light/Makefile b/tools/libs/light/Makefile
index 453bea0067..405115c13c 100644
--- a/tools/libs/light/Makefile
+++ b/tools/libs/light/Makefile
@@ -116,6 +116,7 @@ SRCS-y += libxl_genid.c
SRCS-y += _libxl_types.c
SRCS-y += libxl_flask.c
SRCS-y += _libxl_types_internal.c
+SRCS-y += libxl_overlay.o
ifeq ($(CONFIG_LIBNL),y)
CFLAGS_LIBXL += $(LIBNL3_CFLAGS)
diff --git a/tools/libs/light/libxl_overlay.c b/tools/libs/light/libxl_overlay.c
new file mode 100644
index 0000000000..e370e8cac8
--- /dev/null
+++ b/tools/libs/light/libxl_overlay.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2021 Xilinx Inc.
+ * Author Vikram Garhwal <fnu.vik...@xilinx.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include "libxl_osdeps.h" /* must come before any other headers */
+#include "libxl_internal.h"
+#include <libfdt.h>
+#include <xenguest.h>
+#include <xenctrl.h>
+
+static int check_overlay_fdt(libxl__gc *gc, void *fdt, size_t size)
+{
+ int r;
+
+ if (fdt_magic(fdt) != FDT_MAGIC) {
+ LOG(ERROR, "Overlay FDT is not a valid Flat Device Tree");
+ return ERROR_FAIL;
+ }
+
+ r = fdt_check_header(fdt);
+ if (r) {
+ LOG(ERROR, "Failed to check the overlay FDT (%d)", r);
+ return ERROR_FAIL;
+ }
+
+ if (fdt_totalsize(fdt) > size) {
+ LOG(ERROR, "Overlay FDT totalsize is too big");
+ return ERROR_FAIL;
+ }
+
+ return 0;
+}
+
+int libxl_dt_overlay(libxl_ctx *ctx, void *overlay_dt, int overlay_dt_size,
+ uint8_t overlay_op)
+{
+ int rc = 0;
+ GC_INIT(ctx);
+
+ if (check_overlay_fdt(gc, overlay_dt, overlay_dt_size)) {
+ LOG(ERROR, "Overlay DTB check failed\n");
+ GC_FREE;
+ return ERROR_FAIL;
+ } else
+ LOG(DEBUG, "Overlay DTB check passed\n");
+
+ /* We don't need to do xc_interface_open here. */
+ rc = xc_dt_overlay(ctx->xch, overlay_dt, overlay_dt_size, overlay_op);
+
+ if (rc)
+ LOG(ERROR, "%s: Adding/Removing overlay dtb failed.\n", __func__);
+
+ GC_FREE;
+ return rc;
+}
+
--
2.17.1
