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
kexec_file_add_kernel_image(struct kimage * image,struct s390_load_data * data)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
s390_image_load(struct kimage * image,char * kernel,unsigned long kernel_len,char * initrd,unsigned long initrd_len,char * cmdline,unsigned long cmdline_len)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
s390_image_probe(const char * buf,unsigned long len)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 };
66