arch/s390/kernel/kexec_image.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Image loader for kexec_file_load system call.
   4  *
   5  * Copyright IBM Corp. 2018
   6  *
   7  * Author(s): Philipp Rudo <[email protected]>
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/kernel.h>
  12 #include <linux/kexec.h>
  13 #include <asm/ipl.h>
  14 #include <asm/setup.h>
  15
  16 static int kexec_file_add_kernel_image(struct kimage *image,
  17                                        struct s390_load_data *data)
  18 {
  19         struct kexec_buf buf;
  20
  21         buf.image = image;
  22
  23         buf.buffer = image->kernel_buf;
  24         buf.bufsz = image->kernel_buf_len;
  25
  26         buf.mem = 0;
  27 #ifdef CONFIG_CRASH_DUMP
  28         if (image->type == KEXEC_TYPE_CRASH)
  29                 buf.mem += crashk_res.start;
  30 #endif
  31         buf.memsz = buf.bufsz;
  32
  33         data->kernel_buf = image->kernel_buf;
  34         data->kernel_mem = buf.mem;
  35         data->parm = image->kernel_buf + PARMAREA;
  36         data->memsz += buf.memsz;
  37
  38         ipl_report_add_component(data->report, &buf,
  39                                  IPL_RB_COMPONENT_FLAG_SIGNED |
  40                                  IPL_RB_COMPONENT_FLAG_VERIFIED,
  41                                  IPL_RB_CERT_UNKNOWN);
  42         return kexec_add_buffer(&buf);
  43 }
  44
  45 static void *s390_image_load(struct kimage *image,
  46                              char *kernel, unsigned long kernel_len,
  47                              char *initrd, unsigned long initrd_len,
  48                              char *cmdline, unsigned long cmdline_len)
  49 {
  50         return kexec_file_add_components(image, kexec_file_add_kernel_image);
  51 }
  52
  53 static int s390_image_probe(const char *buf, unsigned long len)
  54 {
  55         /* Can't reliably tell if an image is valid.  Therefore give the
  56          * user whatever he wants.
  57          */
  58         return 0;
  59 }
  60
  61 const struct kexec_file_ops s390_kexec_image_ops = {
  62         .probe = s390_image_probe,
  63         .load = s390_image_load,
  64 #ifdef CONFIG_KEXEC_SIG
  65         .verify_sig = s390_verify_sig,
  66 #endif /* CONFIG_KEXEC_SIG */
  67 };