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 <prudo@linux.vnet.ibm.com>
   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         if (image->type == KEXEC_TYPE_CRASH)
  28                 buf.mem += crashk_res.start;
  29         buf.memsz = buf.bufsz;
  30
  31         data->kernel_buf = image->kernel_buf;
  32         data->kernel_mem = buf.mem;
  33         data->parm = image->kernel_buf + PARMAREA;
  34         data->memsz += buf.memsz;
  35
  36         ipl_report_add_component(data->report, &buf,
  37                                  IPL_RB_COMPONENT_FLAG_SIGNED |
  38                                  IPL_RB_COMPONENT_FLAG_VERIFIED,
  39                                  IPL_RB_CERT_UNKNOWN);
  40         return kexec_add_buffer(&buf);
  41 }
  42
  43 static void *s390_image_load(struct kimage *image,
  44                              char *kernel, unsigned long kernel_len,
  45                              char *initrd, unsigned long initrd_len,
  46                              char *cmdline, unsigned long cmdline_len)
  47 {
  48         return kexec_file_add_components(image, kexec_file_add_kernel_image);
  49 }
  50
  51 static int s390_image_probe(const char *buf, unsigned long len)
  52 {
  53         /* Can't reliably tell if an image is valid.  Therefore give the
  54          * user whatever he wants.
  55          */
  56         return 0;
  57 }
  58
  59 const struct kexec_file_ops s390_kexec_image_ops = {
  60         .probe = s390_image_probe,
  61         .load = s390_image_load,
  62 #ifdef CONFIG_KEXEC_SIG
  63         .verify_sig = s390_verify_sig,
  64 #endif /* CONFIG_KEXEC_SIG */
  65 };