[XEN][RFC PATCH v3 14/14] tools/xl: Add new xl command overlay for device tree overlay support

[Vikram Garhwal <fnu.vikram@xxxxxxxxxx>]

Signed-off-by: Vikram Garhwal <fnu.vikram@xxxxxxxxxx>
---
 tools/xl/xl.h           |  4 ++++
 tools/xl/xl_cmdtable.c  |  6 ++++++
 tools/xl/xl_vmcontrol.c | 45 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+)

diff --git a/tools/xl/xl.h b/tools/xl/xl.h
index c5c4bedbdd..604fd5bb94 100644
--- a/tools/xl/xl.h
+++ b/tools/xl/xl.h
@@ -97,6 +97,9 @@ struct save_file_header {
 
 #define SAVEFILE_BYTEORDER_VALUE ((uint32_t)0x01020304UL)
 
+#define XL_DT_OVERLAY_ADD                   1
+#define XL_DT_OVERLAY_REMOVE                2
+
 void save_domain_core_begin(uint32_t domid,
                             int preserve_domid,
                             const char *override_config_file,
@@ -139,6 +142,7 @@ 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);
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index 661323d488..5812d19db8 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -20,6 +20,12 @@
 #include "xl.h"
 
 const struct cmd_spec cmd_table[] = {
+    { "overlay",
+      &main_dt_overlay, 1, 1,
+      "Add/Remove a device tree overlay",
+      "add/remove <.dtbo>"
+      "-h print this help\n"
+    },
     { "create",
       &main_create, 1, 1,
       "Create a domain from config file <filename>",
diff --git a/tools/xl/xl_vmcontrol.c b/tools/xl/xl_vmcontrol.c
index 435155a033..76b969dc33 100644
--- a/tools/xl/xl_vmcontrol.c
+++ b/tools/xl/xl_vmcontrol.c
@@ -1262,6 +1262,51 @@ int main_create(int argc, char **argv)
     return 0;
 }
 
+int main_dt_overlay(int argc, char **argv)
+{
+    const char *overlay_ops = argv[1];
+    const char *overlay_config_file = argv[2];
+    void *overlay_dtb = NULL;
+    int rc;
+    uint8_t op;
+    int overlay_dtb_size = 0;
+
+    if (overlay_ops == NULL) {
+        fprintf(stderr, "No overlay operation mode provided\n");
+        return ERROR_FAIL;
+    }
+
+    if (strcmp(overlay_ops, "add") == 0)
+        op = XL_DT_OVERLAY_ADD;
+    else if (strcmp(overlay_ops, "remove") == 0)
+        op = XL_DT_OVERLAY_REMOVE;
+    else {
+        fprintf(stderr, "Invalid dt overlay operation\n");
+        return ERROR_FAIL;
+    }
+
+    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);
+    if (rc)
+        fprintf(stderr, "Overlay operation failed\n");
+
+    free(overlay_dtb);
+    return rc;
+}
 /*
  * Local variables:
  * mode: C
-- 
2.17.1