Re: [PATCH v2 1/3] arm64: Add Xen boot support file

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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On 13.07.2015 10:53, fu.wei@linaro.org wrote:
> From: Fu Wei <fu.wei@linaro.org>
> 
> This patch adds Xen boot support file:
> grub-core/loader/arm64/xen_boot.c
> include/grub/arm64/xen_boot.h
> 
> This patch also adds commands register code and hearder file into
> grub-core/loader/arm64/linux.c
> 
>   - This adds support for the Xen boot on ARM specification for arm64.
>   - The implementation for Xen is following  <Multiboot on ARM Specification>:
>       http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/Multiboot
Please don't refer to this protocol as multiboot anywhere in grub or
around because it's NOT multiboot and we don't want to confuse those 2
protocols.
>     and xen/docs/misc/arm/device-tree/booting.txt in Xen source code.
>   - The multiboot/module commands have existed,
>     so we use xen_hypervisor/xen_module instead.
>   - This Xen boot support is built into linux module for aarch64.
>   - Adding this functionality to the existing "linux" module is for
>     reusing the existing code of devicetree.
> 
Please create separate module. Modules are dynamically linked.
> Signed-off-by: Fu Wei <fu.wei@linaro.org>
> ---
>  grub-core/Makefile.core.def       |   1 +
>  grub-core/loader/arm64/linux.c    |   6 +
>  grub-core/loader/arm64/xen_boot.c | 615 ++++++++++++++++++++++++++++++++++++++
>  include/grub/arm64/xen_boot.h     | 115 +++++++
>  4 files changed, 737 insertions(+)
>  create mode 100644 grub-core/loader/arm64/xen_boot.c
>  create mode 100644 include/grub/arm64/xen_boot.h
> 
> diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
> index a6101de..01f8261 100644
> --- a/grub-core/Makefile.core.def
> +++ b/grub-core/Makefile.core.def
> @@ -1659,6 +1659,7 @@ module = {
>    ia64_efi = loader/ia64/efi/linux.c;
>    arm = loader/arm/linux.c;
>    arm64 = loader/arm64/linux.c;
> +  arm64 = loader/arm64/xen_boot.c;
>    fdt = lib/fdt.c;
>    common = loader/linux.c;
>    common = lib/cmdline.c;
> diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
> index 987f5b9..7ae9bde 100644
> --- a/grub-core/loader/arm64/linux.c
> +++ b/grub-core/loader/arm64/linux.c
> @@ -26,6 +26,7 @@
>  #include <grub/mm.h>
>  #include <grub/types.h>
>  #include <grub/cpu/linux.h>
> +#include <grub/cpu/xen_boot.h>
>  #include <grub/efi/efi.h>
>  #include <grub/efi/pe32.h>
>  #include <grub/i18n.h>
> @@ -477,6 +478,9 @@ GRUB_MOD_INIT (linux)
>    cmd_devicetree =
>      grub_register_command ("devicetree", grub_cmd_devicetree, 0,
>  			   N_("Load DTB file."));
> +
> +  grub_arm64_linux_register_xen_boot_command (mod, &loaded);
> +
>    my_mod = mod;
>  }
>  
> @@ -485,4 +489,6 @@ GRUB_MOD_FINI (linux)
>    grub_unregister_command (cmd_linux);
>    grub_unregister_command (cmd_initrd);
>    grub_unregister_command (cmd_devicetree);
> +
> +  grub_arm64_linux_unregister_xen_boot_command ();
>  }
Not needed with separate module.
> diff --git a/grub-core/loader/arm64/xen_boot.c b/grub-core/loader/arm64/xen_boot.c
> new file mode 100644
> index 0000000..23bd00e
> --- /dev/null
> +++ b/grub-core/loader/arm64/xen_boot.c
> @@ -0,0 +1,615 @@
> +/*
> + *  GRUB  --  GRand Unified Bootloader
> + *  Copyright (C) 2014  Free Software Foundation, Inc.
> + *
> + *  GRUB is free software: you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation, either version 3 of the License, or
> + *  (at your option) any later version.
> + *
> + *  GRUB 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 General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License
> + *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <grub/cache.h>
> +#include <grub/charset.h>
> +#include <grub/command.h>
> +#include <grub/err.h>
> +#include <grub/file.h>
> +#include <grub/fdt.h>
> +#include <grub/linux.h>
> +#include <grub/list.h>
> +#include <grub/loader.h>
> +#include <grub/misc.h>
> +#include <grub/mm.h>
> +#include <grub/types.h>
> +#include <grub/cpu/linux.h>
> +#include <grub/cpu/xen_boot.h>
> +#include <grub/efi/efi.h>
> +#include <grub/efi/pe32.h>
> +#include <grub/i18n.h>
> +#include <grub/lib/cmdline.h>
> +
> +static grub_dl_t linux_mod;
> +static int *loaded;
> +
> +static struct xen_boot_binary *xen_hypervisor;
> +static struct xen_boot_binary *module_head;
> +static const grub_size_t module_default_align[] = {
> +  MODULE_IMAGE_MIN_ALIGN,
> +  MODULE_INITRD_MIN_ALIGN,
> +  MODULE_OTHER_MIN_ALIGN,
> +  MODULE_CUSTOM_MIN_ALIGN
> +};
> +
> +static void *xen_boot_fdt;
> +static const compat_string_struct_t default_compat_string[] = {
> +  FDT_COMPATIBLE (MODULE_IMAGE_COMPATIBLE),
> +  FDT_COMPATIBLE (MODULE_INITRD_COMPATIBLE),
> +  FDT_COMPATIBLE (MODULE_OTHER_COMPATIBLE)
> +};
> +
> +
> +/* Parse all the options of xen_module command. For now, we support
> +   (1) --type <the compatible stream>
> +   (2) --nounzip
> +   We also set up the type of module in this function.
> +   If there are some "--type" options in the command line,
> +   we make a custom compatible stream in this function. */
> +static grub_err_t
> +set_module_type (struct xen_boot_binary *module, int argc, char *argv[],
> +		 int *file_name_index)
> +{
> +  char **compat_string_temp_array =
> +    (char **) grub_zalloc (sizeof (char *) * argc);
> +  static module_type_t default_type = MODULE_IMAGE;
> +  grub_size_t total_size = 0;
> +  int num_types = 0, i;
> +  char *temp = NULL;
> +
> +  *file_name_index = 0;
> +
> +  /* if there are some options we need to process. */
> +  while (argc > 1 && !grub_strncmp (argv[0], "--", 2))
> +    {
> +      if (!grub_strcmp (argv[0], "--type"))
> +	{
> +	  module->node_info.type = MODULE_CUSTOM;
> +	  ARG_SHIFT (argc, argv);
> +	  total_size += grub_strlen (argv[0]) + 1;
> +	  compat_string_temp_array[num_types++] = argv[0];
> +	  ARG_SHIFT (argc, argv);
> +	  (*file_name_index) += 2;
This (and subsequent) parsing is unecessarily complicated. Please create
separate commands for different types
> +	}
> +      else if (!grub_strcmp (argv[0], "--nounzip"))
> +	{
> +	  grub_file_filter_disable_compression ();
> +	  ARG_SHIFT (argc, argv);
> +	  (*file_name_index) += 1;
> +	}
> +      else			/* we can add more options process code here. */
> +	{
> +	  grub_dprintf ("xen_boot_loader",
> +			"Unknown option %s, skip.\n", argv[0]);
> +	  ARG_SHIFT (argc, argv);
> +	  (*file_name_index) += 1;
> +	}
> +    }
> +
> +  /* To prevent some wrong command lines using "--type" option */
> +  if (!argc)
> +    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
> +
> +  /* For the default module type :
> +     The implementation is following <Multiboot on ARM Specification>:
> +     Each module will be given a default compatibility property
> +     based on the order in which the modules are added.
> +     The 1st module: compatible = "multiboot,kernel", "multiboot,module"
> +     The 2nd module: compatible = "multiboot,ramdisk", "multiboot,module"
> +     All subsequent modules: compatible = "multiboot,module"
> +     But this order will NOT be interfered with "--type"(MODULE_CUSTOM)
> +     For more detail, please refer to:
> +     http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/Multiboot */
> +  if (module->node_info.type != MODULE_CUSTOM)
> +    {
> +      /* the module type is set by the load order */
> +      module->node_info.type = default_type;
Please don't make it order-dependent more than necessarry.
> +      switch (default_type)
> +	{
> +	case MODULE_IMAGE:
> +	  default_type = MODULE_INITRD;
> +	  break;
> +
> +	case MODULE_INITRD:
> +	  default_type = MODULE_OTHER;
> +	  break;
> +
> +	case MODULE_OTHER:
> +	  break;
> +
> +	default:
> +	  default_type = MODULE_IMAGE;	/* error, reset the type */
> +	  return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid argument"));
> +	}
> +    }
> +  else
> +    {
> +      /* the module type is set by "--type"(MODULE_CUSTOM) */
> +      module->node_info.compat_string = temp =
> +	(char *) grub_zalloc (total_size);
> +      module->node_info.compat_string_size = total_size;
> +      for (i = 0; num_types > 0; num_types--, i++, temp++)
> +	{
> +	  grub_strcpy (temp, compat_string_temp_array[i]);
> +	  temp += grub_strlen (compat_string_temp_array[i]);
> +	}
> +    }
> +
> +  grub_free (compat_string_temp_array);
> +
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +prepare_xen_hypervisor_params (void)
> +{
> +  int chosen_node = 0;
> +  int retval;
> +
> +  xen_boot_fdt = grub_linux_get_fdt ();
> +  if (!xen_boot_fdt)
> +    return grub_error (GRUB_ERR_BAD_OS, "failed to get FDT");
> +
> +  chosen_node = grub_fdt_find_subnode (xen_boot_fdt, 0, "chosen");
> +  if (chosen_node < 0)
> +    chosen_node = grub_fdt_add_subnode (xen_boot_fdt, 0, "chosen");
> +  if (chosen_node < 1)
> +    return grub_error (GRUB_ERR_BAD_OS, "failed to get chosen node in FDT");
> +
BAD_OS means that OS images are invalid. ERR_IO is a generic error for
such cases.
> +  grub_dprintf ("xen_boot_loader",
> +		"Xen Hypervisor cmdline : %s @ %p size:%d\n",
> +		xen_hypervisor->cmdline, xen_hypervisor->cmdline,
> +		xen_hypervisor->cmdline_size);
> +
No need for "boot_". xen_loader is fine and mre consistent.
> +  retval = grub_fdt_set_prop (xen_boot_fdt, chosen_node, "bootargs",
> +			      xen_hypervisor->cmdline,
> +			      xen_hypervisor->cmdline_size);
> +  if (retval)
> +    return grub_error (GRUB_ERR_BAD_OS, "failed to install/update FDT");
> +
ditto
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +prepare_xen_module_params (struct xen_boot_binary *module)
> +{
> +  int retval, chosen_node = 0, module_node = 0;
> +  char module_name[FDT_NODE_NAME_MAX_SIZE];
> +
> +  retval = grub_snprintf (module_name, FDT_NODE_NAME_MAX_SIZE, "module@%lx",
> +			  xen_boot_address_align (module->start,
> +						  module->align));
> +  grub_dprintf ("xen_boot_loader", "Module node name %s \n", module_name);
> +
> +  if (retval < (int) sizeof ("module@"))
> +    return grub_error (GRUB_ERR_BAD_OS, N_("failed to get FDT"));
> +
> +  chosen_node = grub_fdt_find_subnode (xen_boot_fdt, 0, "chosen");
> +  if (chosen_node < 0)
> +    chosen_node = grub_fdt_add_subnode (xen_boot_fdt, 0, "chosen");
> +  if (chosen_node < 1)
> +    return grub_error (GRUB_ERR_BAD_OS, "failed to get chosen node in FDT");
> +
> +  module_node =
> +    grub_fdt_find_subnode (xen_boot_fdt, chosen_node, module_name);
> +  if (module_node < 0)
> +    module_node =
> +      grub_fdt_add_subnode (xen_boot_fdt, chosen_node, module_name);
> +
> +  retval = grub_fdt_set_prop (xen_boot_fdt, module_node, "compatible",
> +			      module->node_info.compat_string,
> +			      (grub_uint32_t) module->node_info.
> +			      compat_string_size);
> +  if (retval)
> +    return grub_error (GRUB_ERR_BAD_OS, N_("failed to update FDT"));
> +
> +  grub_dprintf ("xen_boot_loader", "Module %s compatible = %s size = 0x%lx\n",
> +		module->name, module->node_info.compat_string,
> +		module->node_info.compat_string_size);
> +
> +  retval = grub_fdt_set_reg64 (xen_boot_fdt, module_node,
> +			       xen_boot_address_align (module->start,
> +						       module->align),
> +			       module->size);
> +  if (retval)
> +    return grub_error (GRUB_ERR_BAD_OS, N_("failed to update FDT"));
> +
> +  if (module->cmdline && module->cmdline_size > 0)
> +    {
> +      grub_dprintf ("xen_boot_loader",
> +		    "Module %s cmdline : %s @ %p size:%d\n", module->name,
> +		    module->cmdline, module->cmdline, module->cmdline_size);
> +
> +      retval = grub_fdt_set_prop (xen_boot_fdt, module_node, "bootargs",
> +				  module->cmdline, module->cmdline_size + 1);
> +      if (retval)
> +	return grub_error (GRUB_ERR_BAD_OS, "failed to update FDT");
> +    }
> +  else
> +    {
> +      grub_dprintf ("xen_boot_loader", "Module %s has not bootargs!\n",
> +		    module->name);
> +    }
> +
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +install_all_params (void)
> +{
> +  grub_efi_guid_t fdt_guid = GRUB_EFI_DEVICE_TREE_GUID;
> +  grub_efi_boot_services_t *b;
> +  grub_efi_status_t status;
> +
> +  b = grub_efi_system_table->boot_services;
> +  status = b->install_configuration_table (&fdt_guid, xen_boot_fdt);
> +  if (status != GRUB_EFI_SUCCESS)
> +    return grub_error (GRUB_ERR_BAD_OS, "failed to install FDT");
> +
> +  grub_dprintf ("xen_boot_loader",
> +		"Installed/updated FDT configuration table @ %p\n",
> +		xen_boot_fdt);
> +
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +clean_all_params (void)
> +{
> +  if (xen_boot_fdt)
> +    {
> +      grub_efi_free_pages ((grub_efi_physical_address_t) xen_boot_fdt,
> +			   BYTES_TO_PAGES (grub_fdt_get_totalsize
> +					   (xen_boot_fdt)));
> +      xen_boot_fdt = NULL;
> +    }
> +
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +finalize_params_xen_boot (void)
> +{
> +  struct xen_boot_binary *module;
> +
> +  if (xen_hypervisor)
> +    {
> +      if (prepare_xen_hypervisor_params () != GRUB_ERR_NONE)
> +	goto fail;
> +    }
> +  else
> +    {
> +      grub_dprintf ("xen_boot_loader",
> +		    "Failed to get Xen Hypervisor info!\n");
> +      goto fail;
> +    }
> +
> +  /* Set module params info */
> +  FOR_LIST_ELEMENTS (module, module_head)
> +  {
> +    if (module->start && module->size > 0)
> +      {
> +	grub_dprintf ("xen_boot_loader", "Module %s @ 0x%lx size:0x%lx\n",
> +		      module->name,
> +		      xen_boot_address_align (module->start, module->align),
> +		      module->size);
> +	if (prepare_xen_module_params (module) != GRUB_ERR_NONE)
> +	  goto fail;
> +      }
> +    else
> +      {
> +	grub_dprintf ("xen_boot_loader", "Module info error: %s!\n",
> +		      module->name);
> +	goto fail;
> +      }
> +  }
> +
> +  if (install_all_params () == GRUB_ERR_NONE)
> +    return GRUB_ERR_NONE;
> +
> +fail:
> +  clean_all_params ();
> +
> +  return grub_error (GRUB_ERR_BAD_OS, "failed to install/update FDT");
> +}
> +
> +
> +static grub_err_t
> +xen_boot (void)
> +{
> +  if (finalize_params_xen_boot () != GRUB_ERR_NONE)
> +    return grub_errno;
> +
Better use err = finalize_params_xen_boot (); if (err) return err;
> +  return grub_arm64_uefi_boot_image (xen_hypervisor->start,
> +				     xen_hypervisor->size,
> +				     xen_hypervisor->cmdline);
> +}
> +
> +static void
> +single_binary_unload (struct xen_boot_binary *binary)
> +{
Just put if (!binary) return; It will save a lot of if's.
> +  if (binary && binary->start && binary->size > 0)
> +    {
> +      grub_efi_free_pages ((grub_efi_physical_address_t) binary->start,
> +			   BYTES_TO_PAGES (binary->size + binary->align));
> +    }
> +
> +  if (binary && binary->cmdline && binary->cmdline_size > 0)
> +    {
> +      grub_free (binary->cmdline);
> +      grub_dprintf ("xen_boot_loader",
> +		    "Module %s cmdline memory free @ %p size: %d\n",
> +		    binary->name, binary->cmdline, binary->cmdline_size);
> +    }
> +
> +  if (binary)
> +    {
> +      if (binary->node_info.type == MODULE_CUSTOM)
> +	grub_free ((void *) binary->node_info.compat_string);
> +      if (grub_strcmp (binary->name, XEN_HYPERVISOR_NAME))
> +	grub_list_remove (GRUB_AS_LIST (binary));
> +      grub_dprintf ("xen_boot_loader",
> +		    "Module %s struct memory free @ %p size: 0x%lx\n",
> +		    binary->name, binary, sizeof (binary));
> +      grub_free (binary);
> +    }
> +
> +  return;
> +}
> +
> +static void
> +all_binaries_unload (void)
> +{
> +  struct xen_boot_binary *binary;
> +
> +  FOR_LIST_ELEMENTS (binary, module_head)
> +  {
> +    single_binary_unload (binary);
> +  }
> +
> +  if (xen_hypervisor)
> +    single_binary_unload (xen_hypervisor);
> +
> +  return;
> +}
> +
> +static grub_err_t
> +xen_unload (void)
> +{
> +  *loaded = 0;
> +  all_binaries_unload ();
> +  clean_all_params ();
> +  grub_dl_unref (linux_mod);
> +
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +xen_boot_binary_load (struct xen_boot_binary *binary, grub_file_t file,
> +		      int argc, char *argv[])
> +{
> +  binary->size = grub_file_size (file);
> +  grub_dprintf ("xen_boot_loader", "Xen_boot %s file size: 0x%lx\n",
> +		binary->name, binary->size);
> +
> +  binary->start = (grub_addr_t) grub_efi_allocate_pages (0,
> +							 (BYTES_TO_PAGES
> +							  (binary->size +
> +							   binary->align)));
> +  if (!binary->start)
> +    return grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
> +
> +  grub_dprintf ("xen_boot_loader", "Xen_boot %s numpages: 0x%lx\n",
> +		binary->name, BYTES_TO_PAGES (binary->size + binary->align));
> +
> +  if (grub_file_read (file, (void *) xen_boot_address_align (binary->start,
> +							     binary->align),
> +		      binary->size) < (grub_ssize_t) binary->size)
> +    {
We use != throughout. It's safer.
> +      single_binary_unload (binary);
> +      return grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
> +			 argv[0]);
> +    }
> +
> +  /* Skip the xen_boot binary file name */
> +  ARG_SHIFT (argc, argv);
> +
There shouldn't be any need for shifting. Just use argc - 1 and argv + 1
> +  if (argc > 0)
> +    {
> +      binary->cmdline_size = grub_loader_cmdline_size (argc, argv);
> +      binary->cmdline = grub_zalloc (binary->cmdline_size);
> +      if (!binary->cmdline)
> +	{
> +	  single_binary_unload (binary);
> +	  return grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
> +	}
> +      grub_create_loader_cmdline (argc, argv, binary->cmdline,
> +				  binary->cmdline_size);
> +      grub_dprintf ("xen_boot_loader",
> +		    "Xen_boot %s cmdline @ %p %s, size: %d\n", binary->name,
> +		    binary->cmdline, binary->cmdline, binary->cmdline_size);
> +    }
> +  else
> +    {
> +      binary->cmdline_size = 0;
> +      binary->cmdline = NULL;
> +    }
> +
> +  return GRUB_ERR_NONE;
> +}
> +
> +static grub_err_t
> +grub_cmd_xen_module (grub_command_t cmd __attribute__ ((unused)),
> +		     int argc, char *argv[])
> +{
> +
> +  struct xen_boot_binary *module = NULL;
> +  int file_name_index = 0;
> +  grub_file_t file = 0;
> +
> +  if (!argc)
> +    {
> +      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
> +      goto fail;
> +    }
> +
> +  if (!*loaded)
> +    {
> +      grub_error (GRUB_ERR_BAD_ARGUMENT,
> +		  N_("you need to load the Xen Hypervisor first"));
> +      goto fail;
> +    }
> +
> +  module =
> +    (struct xen_boot_binary *) grub_zalloc (sizeof (struct xen_boot_binary));
> +  if (!module)
> +    return grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
> +
Just return grub_errno; zalloc already calls grub_error
> +  /* process all the options and get module type */
> +  if (set_module_type (module, argc, argv, &file_name_index) != GRUB_ERR_NONE)
> +    goto fail;
> +  switch (module->node_info.type)
> +    {
> +    case MODULE_IMAGE:
> +    case MODULE_INITRD:
> +    case MODULE_OTHER:
> +      module->node_info.compat_string =
> +	default_compat_string[module->node_info.type].compat_string;
> +      module->node_info.compat_string_size =
> +	default_compat_string[module->node_info.type].size;
> +      break;
> +
> +    case MODULE_CUSTOM:
> +      /* we have set the node_info in set_module_type */
> +      break;
> +
> +    default:
> +      return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid argument"));
> +    }
> +  module->name = module->node_info.compat_string;
> +  module->align = module_default_align[module->node_info.type];
> +
> +  grub_dprintf ("xen_boot_loader", "Init %s module and node info:\n"
> +		"compatible %s\ncompat_string_size 0x%lx\n",
> +		module->name, module->node_info.compat_string,
> +		module->node_info.compat_string_size);
> +
> +  file = grub_file_open (argv[file_name_index]);
> +  if (!file)
> +    goto fail;
> +
> +  grub_errno = xen_boot_binary_load (module, file, argc - file_name_index,
> +				     argv + file_name_index);
> +
When you call grub_error. grub_errno is already set
> +  if (grub_errno == GRUB_ERR_NONE)
> +    grub_list_push (GRUB_AS_LIST_P (&module_head), GRUB_AS_LIST (module));
> +
> +fail:
> +  if (file)
> +    grub_file_close (file);
> +  if (grub_errno != GRUB_ERR_NONE)
> +    single_binary_unload (module);
> +
> +  return grub_errno;
> +}
> +
> +static grub_err_t
> +grub_cmd_xen_hypervisor (grub_command_t cmd __attribute__ ((unused)),
> +			 int argc, char *argv[])
> +{
> +  struct xen_hypervisor_header sh;
> +  grub_file_t file = NULL;
> +
> +  grub_dl_ref (linux_mod);
> +
> +  if (!argc)
> +    {
> +      grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
> +      goto fail;
> +    }
> +
> +  /* For now, we don't support any option in xen_hypervisor command.
> +     If there are some options, we skip them. */
> +  while (argc > 1 && !grub_strncmp (argv[0], "--", 2))
> +    {
> +      grub_dprintf ("xen_boot_loader", "Unknown option %s, skip.\n", argv[0]);
> +      ARG_SHIFT (argc, argv);
> +    }
> +
Why do you need this? Just delete it.
> +  file = grub_file_open (argv[0]);
> +  if (!file)
> +    goto fail;
> +
> +  if (grub_file_read (file, &sh, sizeof (sh)) < (long) sizeof (sh))
> +    goto fail;
> +  if (grub_arm64_uefi_check_image
> +      ((struct grub_arm64_linux_kernel_header *) &sh) != GRUB_ERR_NONE)
> +    goto fail;
> +  grub_file_seek (file, 0);
> +
> +  grub_loader_unset ();
> +
This is implicit in loader_set. Please add a comment why it needs to be
explicit. I suppose it's to avoid unloading oneself.
> +  xen_hypervisor =
> +    (struct xen_boot_binary *) grub_zalloc (sizeof (struct xen_boot_binary));
> +  if (!xen_hypervisor)
> +    return grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
> +
Ditto
> +  xen_hypervisor->name = XEN_HYPERVISOR_NAME;
> +  xen_hypervisor->align = (grub_size_t) sh.optional_header.section_alignment;
> +
> +  grub_errno = xen_boot_binary_load (xen_hypervisor, file, argc, argv);
> +  if (grub_errno == GRUB_ERR_NONE)
> +    {
> +      grub_loader_set (xen_boot, xen_unload, 0);
> +      *loaded = 1;
> +    }
> +
> +fail:
> +  if (file)
> +    grub_file_close (file);
> +  if (grub_errno != GRUB_ERR_NONE)
> +    {
> +      *loaded = 0;
> +      all_binaries_unload ();
> +      grub_dl_unref (linux_mod);
> +    }
> +
> +  return grub_errno;
> +}
> +
> +static grub_command_t cmd_xen_hypervisor, cmd_xen_module;
> +
> +void
> +grub_arm64_linux_register_xen_boot_command (grub_dl_t mod, int *linux_loaded)
> +{
> +  cmd_xen_hypervisor =
> +    grub_register_command ("xen_hypervisor", grub_cmd_xen_hypervisor, 0,
> +			   N_("Load a xen hypervisor."));
> +  cmd_xen_module =
> +    grub_register_command ("xen_module", grub_cmd_xen_module, 0,
> +			   N_("Load a xen module."));
> +  linux_mod = mod;
> +  loaded = linux_loaded;
> +}
> +
> +void
> +grub_arm64_linux_unregister_xen_boot_command (void)
> +{
> +  grub_unregister_command (cmd_xen_hypervisor);
> +  grub_unregister_command (cmd_xen_module);
> +}
> diff --git a/include/grub/arm64/xen_boot.h b/include/grub/arm64/xen_boot.h
> new file mode 100644
> index 0000000..8e8f6cb
> --- /dev/null
> +++ b/include/grub/arm64/xen_boot.h
> @@ -0,0 +1,115 @@
> +/*
> + *  xen_boot.h - Xen boot header file for Xen boot via FDT
> + *  on AArch64 architecture.
> + *  Copyright (C) 2014  Free Software Foundation, Inc.
> + *
> + *  GRUB is free software: you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation, either version 3 of the License, or
> + *  (at your option) any later version.
> + *
> + *  GRUB 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 General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License
> + *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef XEN_BOOT_HEADER
> +#define XEN_BOOT_HEADER 1
> +
> +#include <grub/list.h>
> +#include <grub/types.h>
> +#include <grub/efi/pe32.h>	/* required by struct xen_hypervisor_header */
> +
This file doesn't really look like having anything reusable. Please put
it directly into .c
> +#define XEN_HYPERVISOR_NAME  "xen_hypervisor"
> +
> +#define MODULE_DEFAULT_ALIGN  (0x0)
> +#define MODULE_IMAGE_MIN_ALIGN  MODULE_DEFAULT_ALIGN
> +#define MODULE_INITRD_MIN_ALIGN  MODULE_DEFAULT_ALIGN
> +#define MODULE_OTHER_MIN_ALIGN  MODULE_DEFAULT_ALIGN
> +#define MODULE_CUSTOM_MIN_ALIGN  MODULE_DEFAULT_ALIGN
> +
> +#define MODULE_IMAGE_COMPATIBLE  "multiboot,kernel\0multiboot,module"
> +#define MODULE_INITRD_COMPATIBLE  "multiboot,ramdisk\0multiboot,module"
> +#define MODULE_OTHER_COMPATIBLE  "multiboot,module"
> +
> +/* This maximum size is defined in Power.org ePAPR V1.1
> + * https://www.power.org/documentation/epapr-version-1-1/
> + * 2.2.1.1 Node Name Requirements
> + * node-name@unit-address
> + * 31 + 1(@) + 16(64bit address in hex format) + 1(\0) = 49
> + */
> +#define FDT_NODE_NAME_MAX_SIZE  (49)
> +
> +#define ARG_SHIFT(argc, argv) \
> +  do { \
> +    (argc)--; \
> +    (argv)++; \
> +  } while (0)
> +
> +struct compat_string_struct
> +{
> +  grub_size_t size;
> +  const char *compat_string;
> +};
> +typedef struct compat_string_struct compat_string_struct_t;
> +#define FDT_COMPATIBLE(x) {.size = sizeof(x), .compat_string = (x)}
> +
> +enum module_type
> +{
> +  MODULE_IMAGE,
> +  MODULE_INITRD,
> +  MODULE_OTHER,
> +  MODULE_CUSTOM
> +};
> +typedef enum module_type module_type_t;
> +
> +struct fdt_node_info
> +{
> +  module_type_t type;
> +
> +  const char *compat_string;
> +  grub_size_t compat_string_size;
> +};
> +
> +struct xen_hypervisor_header
> +{
> +  struct grub_arm64_linux_kernel_header efi_head;
> +
> +  /* This is always PE\0\0.  */
> +  grub_uint8_t signature[GRUB_PE32_SIGNATURE_SIZE];
> +  /* The COFF file header.  */
> +  struct grub_pe32_coff_header coff_header;
> +  /* The Optional header.  */
> +  struct grub_pe64_optional_header optional_header;
> +};
> +
> +struct xen_boot_binary
> +{
> +  struct xen_boot_binary *next;
> +  struct xen_boot_binary **prev;
> +  const char *name;
> +
> +  grub_addr_t start;
> +  grub_size_t size;
> +  grub_size_t align;
> +
> +  char *cmdline;
> +  int cmdline_size;
> +
> +  struct fdt_node_info node_info;
> +};
> +
> +void grub_arm64_linux_register_xen_boot_command (grub_dl_t mod, int *loaded);
> +void grub_arm64_linux_unregister_xen_boot_command (void);
> +
> +static __inline grub_addr_t
> +xen_boot_address_align (grub_addr_t start, grub_size_t align)
> +{
> +  return (align ? (ALIGN_UP (start, align)) : start);
> +}
> +
> +#endif /* ! XEN_BOOT_HEADER */
> 



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