[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [XEN][RFC PATCH v3 13/14] tools/libs/light: Implement new libxl functions for device tree overlay ops
Signed-off-by: Vikram Garhwal <fnu.vikram@xxxxxxxxxx> --- 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.vikram@xxxxxxxxxx> + * + * 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
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