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2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777 
 kernel/kernel/kexec_core.c
....@@ -1,9 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * kexec.c - kexec system call core code.
34  * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
4
- *
5
- * This source code is licensed under the GNU General Public License,
6
- * Version 2.  See the file COPYING for more details.
75  */
86 
97 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -38,7 +36,7 @@
3836 #include <linux/syscore_ops.h>
3937 #include <linux/compiler.h>
4038 #include <linux/hugetlb.h>
41
-#include <linux/frame.h>
39
+#include <linux/objtool.h>
4240 
4341 #include <asm/page.h>
4442 #include <asm/sections.h>
....@@ -47,7 +45,7 @@
4745 #include <crypto/sha.h>
4846 #include "kexec_internal.h"
4947 
50
-DEFINE_MUTEX(kexec_mutex);
48
+atomic_t __kexec_lock = ATOMIC_INIT(0);
5149 
5250 /* Per cpu memory for storing cpu states in case of system crash. */
5351 note_buf_t __percpu *crash_notes;
....@@ -111,7 +109,7 @@
111109  * defined more restrictively in <asm/kexec.h>.
112110  *
113111  * The code for the transition from the current kernel to the
114
- * the new kernel is placed in the control_code_buffer, whose size
112
+ * new kernel is placed in the control_code_buffer, whose size
115113  * is given by KEXEC_CONTROL_PAGE_SIZE.  In the best case only a single
116114  * page of memory is necessary, but some architectures require more.
117115  * Because this memory must be identity mapped in the transition from
....@@ -152,6 +150,7 @@
152150 	int i;
153151 	unsigned long nr_segments = image->nr_segments;
154152 	unsigned long total_pages = 0;
153
+	unsigned long nr_pages = totalram_pages();
155154 
156155 	/*
157156 	 * Verify we have good destination addresses.  The caller is
....@@ -217,13 +216,13 @@
217216 	 * wasted allocating pages, which can cause a soft lockup.
218217 	 */
219218 	for (i = 0; i < nr_segments; i++) {
220
-		if (PAGE_COUNT(image->segment[i].memsz) > totalram_pages / 2)
219
+		if (PAGE_COUNT(image->segment[i].memsz) > nr_pages / 2)
221220 			return -EINVAL;
222221 
223222 		total_pages += PAGE_COUNT(image->segment[i].memsz);
224223 	}
225224 
226
-	if (total_pages > totalram_pages / 2)
225
+	if (total_pages > nr_pages / 2)
227226 		return -EINVAL;
228227 
229228 	/*
....@@ -590,6 +589,12 @@
590589 	kimage_free_page_list(&image->unusable_pages);
591590 
592591 }
592
+
593
+int __weak machine_kexec_post_load(struct kimage *image)
594
+{
595
+	return 0;
596
+}
597
+
593598 void kimage_terminate(struct kimage *image)
594599 {
595600 	if (*image->entry != 0)
....@@ -938,7 +943,7 @@
938943  */
939944 void __noclone __crash_kexec(struct pt_regs *regs)
940945 {
941
-	/* Take the kexec_mutex here to prevent sys_kexec_load
946
+	/* Take the kexec_lock here to prevent sys_kexec_load
942947 	 * running on one cpu from replacing the crash kernel
943948 	 * we are using after a panic on a different cpu.
944949 	 *
....@@ -946,7 +951,7 @@
946951 	 * of memory the xchg(&kexec_crash_image) would be
947952 	 * sufficient.  But since I reuse the memory...
948953 	 */
949
-	if (mutex_trylock(&kexec_mutex)) {
954
+	if (kexec_trylock()) {
950955 		if (kexec_crash_image) {
951956 			struct pt_regs fixed_regs;
952957 
....@@ -955,7 +960,7 @@
955960 			machine_crash_shutdown(&fixed_regs);
956961 			machine_kexec(kexec_crash_image);
957962 		}
958
-		mutex_unlock(&kexec_mutex);
963
+		kexec_unlock();
959964 	}
960965 }
961966 STACK_FRAME_NON_STANDARD(__crash_kexec);
....@@ -984,14 +989,17 @@
984989 	}
985990 }
986991 
987
-size_t crash_get_memory_size(void)
992
+ssize_t crash_get_memory_size(void)
988993 {
989
-	size_t size = 0;
994
+	ssize_t size = 0;
990995 
991
-	mutex_lock(&kexec_mutex);
996
+	if (!kexec_trylock())
997
+		return -EBUSY;
998
+
992999 	if (crashk_res.end != crashk_res.start)
9931000 		size = resource_size(&crashk_res);
994
-	mutex_unlock(&kexec_mutex);
1001
+
1002
+	kexec_unlock();
9951003 	return size;
9961004 }
9971005 
....@@ -1011,7 +1019,8 @@
10111019 	unsigned long old_size;
10121020 	struct resource *ram_res;
10131021 
1014
-	mutex_lock(&kexec_mutex);
1022
+	if (!kexec_trylock())
1023
+		return -EBUSY;
10151024 
10161025 	if (kexec_crash_image) {
10171026 		ret = -ENOENT;
....@@ -1020,6 +1029,7 @@
10201029 	start = crashk_res.start;
10211030 	end = crashk_res.end;
10221031 	old_size = (end == 0) ? 0 : end - start + 1;
1032
+	new_size = roundup(new_size, KEXEC_CRASH_MEM_ALIGN);
10231033 	if (new_size >= old_size) {
10241034 		ret = (new_size == old_size) ? 0 : -EINVAL;
10251035 		goto unlock;
....@@ -1031,9 +1041,7 @@
10311041 		goto unlock;
10321042 	}
10331043 
1034
-	start = roundup(start, KEXEC_CRASH_MEM_ALIGN);
1035
-	end = roundup(start + new_size, KEXEC_CRASH_MEM_ALIGN);
1036
-
1044
+	end = start + new_size;
10371045 	crash_free_reserved_phys_range(end, crashk_res.end);
10381046 
10391047 	if ((start == end) && (crashk_res.parent != NULL))
....@@ -1049,7 +1057,7 @@
10491057 	insert_resource(&iomem_resource, ram_res);
10501058 
10511059 unlock:
1052
-	mutex_unlock(&kexec_mutex);
1060
+	kexec_unlock();
10531061 	return ret;
10541062 }
10551063 
....@@ -1121,7 +1129,7 @@
11211129 {
11221130 	int error = 0;
11231131 
1124
-	if (!mutex_trylock(&kexec_mutex))
1132
+	if (!kexec_trylock())
11251133 		return -EBUSY;
11261134 	if (!kexec_image) {
11271135 		error = -EINVAL;
....@@ -1150,7 +1158,7 @@
11501158 		error = dpm_suspend_end(PMSG_FREEZE);
11511159 		if (error)
11521160 			goto Resume_devices;
1153
-		error = disable_nonboot_cpus();
1161
+		error = suspend_disable_secondary_cpus();
11541162 		if (error)
11551163 			goto Enable_cpus;
11561164 		local_irq_disable();
....@@ -1171,7 +1179,7 @@
11711179 		 * CPU hotplug again; so re-enable it here.
11721180 		 */
11731181 		cpu_hotplug_enable();
1174
-		pr_emerg("Starting new kernel\n");
1182
+		pr_notice("Starting new kernel\n");
11751183 		machine_shutdown();
11761184 	}
11771185 
....@@ -1183,7 +1191,7 @@
11831191  Enable_irqs:
11841192 		local_irq_enable();
11851193  Enable_cpus:
1186
-		enable_nonboot_cpus();
1194
+		suspend_enable_secondary_cpus();
11871195 		dpm_resume_start(PMSG_RESTORE);
11881196  Resume_devices:
11891197 		dpm_resume_end(PMSG_RESTORE);
....@@ -1196,7 +1204,7 @@
11961204 #endif
11971205 
11981206  Unlock:
1199
-	mutex_unlock(&kexec_mutex);
1207
+	kexec_unlock();
12001208 	return error;
12011209 }
12021210