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