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2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390 
 kernel/arch/x86/kernel/crash.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
34  *
....@@ -23,6 +24,7 @@
2324 #include <linux/export.h>
2425 #include <linux/slab.h>
2526 #include <linux/vmalloc.h>
27
+#include <linux/memblock.h>
2628 
2729 #include <asm/processor.h>
2830 #include <asm/hardirq.h>
....@@ -35,8 +37,9 @@
3537 #include <linux/kdebug.h>
3638 #include <asm/cpu.h>
3739 #include <asm/reboot.h>
38
-#include <asm/virtext.h>
3940 #include <asm/intel_pt.h>
41
+#include <asm/crash.h>
42
+#include <asm/cmdline.h>
4043 
4144 /* Used while preparing memory map entries for second kernel */
4245 struct crash_memmap_data {
....@@ -54,7 +57,6 @@
5457  */
5558 crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss = NULL;
5659 EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss);
57
-unsigned long crash_zero_bytes;
5860 
5961 static inline void cpu_crash_vmclear_loaded_vmcss(void)
6062 {
....@@ -67,33 +69,29 @@
6769 	rcu_read_unlock();
6870 }
6971 
72
+/*
73
+ * When the crashkernel option is specified, only use the low
74
+ * 1M for the real mode trampoline.
75
+ */
76
+void __init crash_reserve_low_1M(void)
77
+{
78
+	if (cmdline_find_option(boot_command_line, "crashkernel", NULL, 0) < 0)
79
+		return;
80
+
81
+	memblock_reserve(0, 1<<20);
82
+	pr_info("Reserving the low 1M of memory for crashkernel\n");
83
+}
84
+
7085 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
7186 
7287 static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
7388 {
74
-#ifdef CONFIG_X86_32
75
-	struct pt_regs fixed_regs;
76
-
77
-	if (!user_mode(regs)) {
78
-		crash_fixup_ss_esp(&fixed_regs, regs);
79
-		regs = &fixed_regs;
80
-	}
81
-#endif
8289 	crash_save_cpu(regs, cpu);
8390 
8491 	/*
8592 	 * VMCLEAR VMCSs loaded on all cpus if needed.
8693 	 */
8794 	cpu_crash_vmclear_loaded_vmcss();
88
-
89
-	/* Disable VMX or SVM if needed.
90
-	 *
91
-	 * We need to disable virtualization on all CPUs.
92
-	 * Having VMX or SVM enabled on any CPU may break rebooting
93
-	 * after the kdump kernel has finished its task.
94
-	 */
95
-	cpu_emergency_vmxoff();
96
-	cpu_emergency_svm_disable();
9795 
9896 	/*
9997 	 * Disable Intel PT to stop its logging
....@@ -153,12 +151,7 @@
153151 	 */
154152 	cpu_crash_vmclear_loaded_vmcss();
155153 
156
-	/* Booting kdump kernel with VMX or SVM enabled won't work,
157
-	 * because (among other limitations) we can't disable paging
158
-	 * with the virt flags.
159
-	 */
160
-	cpu_emergency_vmxoff();
161
-	cpu_emergency_svm_disable();
154
+	cpu_emergency_disable_virtualization();
162155 
163156 	/*
164157 	 * Disable Intel PT to stop its logging
....@@ -179,6 +172,7 @@
179172 }
180173 
181174 #ifdef CONFIG_KEXEC_FILE
175
+
182176 static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
183177 {
184178 	unsigned int *nr_ranges = arg;
....@@ -193,8 +187,7 @@
193187 	unsigned int nr_ranges = 0;
194188 	struct crash_mem *cmem;
195189 
196
-	walk_system_ram_res(0, -1, &nr_ranges,
197
-				get_nr_ram_ranges_callback);
190
+	walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
198191 	if (!nr_ranges)
199192 		return NULL;
200193 
....@@ -203,8 +196,7 @@
203196 	 * another range split. So add extra two slots here.
204197 	 */
205198 	nr_ranges += 2;
206
-	cmem = vzalloc(sizeof(struct crash_mem) +
207
-			sizeof(struct crash_mem_range) * nr_ranges);
199
+	cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
208200 	if (!cmem)
209201 		return NULL;
210202 
....@@ -222,17 +214,19 @@
222214 {
223215 	int ret = 0;
224216 
217
+	/* Exclude the low 1M because it is always reserved */
218
+	ret = crash_exclude_mem_range(cmem, 0, (1<<20)-1);
219
+	if (ret)
220
+		return ret;
221
+
225222 	/* Exclude crashkernel region */
226223 	ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
227224 	if (ret)
228225 		return ret;
229226 
230
-	if (crashk_low_res.end) {
227
+	if (crashk_low_res.end)
231228 		ret = crash_exclude_mem_range(cmem, crashk_low_res.start,
232
-							crashk_low_res.end);
233
-		if (ret)
234
-			return ret;
235
-	}
229
+					      crashk_low_res.end);
236230 
237231 	return ret;
238232 }
....@@ -253,16 +247,13 @@
253247 					unsigned long *sz)
254248 {
255249 	struct crash_mem *cmem;
256
-	Elf64_Ehdr *ehdr;
257
-	Elf64_Phdr *phdr;
258
-	int ret, i;
250
+	int ret;
259251 
260252 	cmem = fill_up_crash_elf_data();
261253 	if (!cmem)
262254 		return -ENOMEM;
263255 
264
-	ret = walk_system_ram_res(0, -1, cmem,
265
-				prepare_elf64_ram_headers_callback);
256
+	ret = walk_system_ram_res(0, -1, cmem, prepare_elf64_ram_headers_callback);
266257 	if (ret)
267258 		goto out;
268259 
....@@ -272,24 +263,8 @@
272263 		goto out;
273264 
274265 	/* By default prepare 64bit headers */
275
-	ret =  crash_prepare_elf64_headers(cmem,
276
-				IS_ENABLED(CONFIG_X86_64), addr, sz);
277
-	if (ret)
278
-		goto out;
266
+	ret =  crash_prepare_elf64_headers(cmem, IS_ENABLED(CONFIG_X86_64), addr, sz);
279267 
280
-	/*
281
-	 * If a range matches backup region, adjust offset to backup
282
-	 * segment.
283
-	 */
284
-	ehdr = (Elf64_Ehdr *)*addr;
285
-	phdr = (Elf64_Phdr *)(ehdr + 1);
286
-	for (i = 0; i < ehdr->e_phnum; phdr++, i++)
287
-		if (phdr->p_type == PT_LOAD &&
288
-				phdr->p_paddr == image->arch.backup_src_start &&
289
-				phdr->p_memsz == image->arch.backup_src_sz) {
290
-			phdr->p_offset = image->arch.backup_load_addr;
291
-			break;
292
-		}
293268 out:
294269 	vfree(cmem);
295270 	return ret;
....@@ -303,8 +278,7 @@
303278 	if (nr_e820_entries >= E820_MAX_ENTRIES_ZEROPAGE)
304279 		return 1;
305280 
306
-	memcpy(&params->e820_table[nr_e820_entries], entry,
307
-			sizeof(struct e820_entry));
281
+	memcpy(&params->e820_table[nr_e820_entries], entry, sizeof(struct e820_entry));
308282 	params->e820_entries++;
309283 	return 0;
310284 }
....@@ -328,18 +302,10 @@
328302 				 unsigned long long mend)
329303 {
330304 	unsigned long start, end;
331
-	int ret = 0;
332305 
333306 	cmem->ranges[0].start = mstart;
334307 	cmem->ranges[0].end = mend;
335308 	cmem->nr_ranges = 1;
336
-
337
-	/* Exclude Backup region */
338
-	start = image->arch.backup_load_addr;
339
-	end = start + image->arch.backup_src_sz - 1;
340
-	ret = crash_exclude_mem_range(cmem, start, end);
341
-	if (ret)
342
-		return ret;
343309 
344310 	/* Exclude elf header region */
345311 	start = image->arch.elf_load_addr;
....@@ -363,34 +329,39 @@
363329 	memset(&cmd, 0, sizeof(struct crash_memmap_data));
364330 	cmd.params = params;
365331 
366
-	/* Add first 640K segment */
367
-	ei.addr = image->arch.backup_src_start;
368
-	ei.size = image->arch.backup_src_sz;
369
-	ei.type = E820_TYPE_RAM;
370
-	add_e820_entry(params, &ei);
332
+	/* Add the low 1M */
333
+	cmd.type = E820_TYPE_RAM;
334
+	flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
335
+	walk_iomem_res_desc(IORES_DESC_NONE, flags, 0, (1<<20)-1, &cmd,
336
+			    memmap_entry_callback);
371337 
372338 	/* Add ACPI tables */
373339 	cmd.type = E820_TYPE_ACPI;
374340 	flags = IORESOURCE_MEM | IORESOURCE_BUSY;
375341 	walk_iomem_res_desc(IORES_DESC_ACPI_TABLES, flags, 0, -1, &cmd,
376
-		       memmap_entry_callback);
342
+			    memmap_entry_callback);
377343 
378344 	/* Add ACPI Non-volatile Storage */
379345 	cmd.type = E820_TYPE_NVS;
380346 	walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1, &cmd,
381
-			memmap_entry_callback);
347
+			    memmap_entry_callback);
348
+
349
+	/* Add e820 reserved ranges */
350
+	cmd.type = E820_TYPE_RESERVED;
351
+	flags = IORESOURCE_MEM;
352
+	walk_iomem_res_desc(IORES_DESC_RESERVED, flags, 0, -1, &cmd,
353
+			    memmap_entry_callback);
382354 
383355 	/* Add crashk_low_res region */
384356 	if (crashk_low_res.end) {
385357 		ei.addr = crashk_low_res.start;
386
-		ei.size = crashk_low_res.end - crashk_low_res.start + 1;
358
+		ei.size = resource_size(&crashk_low_res);
387359 		ei.type = E820_TYPE_RAM;
388360 		add_e820_entry(params, &ei);
389361 	}
390362 
391363 	/* Exclude some ranges from crashk_res and add rest to memmap */
392
-	ret = memmap_exclude_ranges(image, cmem, crashk_res.start,
393
-						crashk_res.end);
364
+	ret = memmap_exclude_ranges(image, cmem, crashk_res.start, crashk_res.end);
394365 	if (ret)
395366 		goto out;
396367 
....@@ -410,54 +381,11 @@
410381 	return ret;
411382 }
412383 
413
-static int determine_backup_region(struct resource *res, void *arg)
414
-{
415
-	struct kimage *image = arg;
416
-
417
-	image->arch.backup_src_start = res->start;
418
-	image->arch.backup_src_sz = resource_size(res);
419
-
420
-	/* Expecting only one range for backup region */
421
-	return 1;
422
-}
423
-
424384 int crash_load_segments(struct kimage *image)
425385 {
426386 	int ret;
427387 	struct kexec_buf kbuf = { .image = image, .buf_min = 0,
428388 				  .buf_max = ULONG_MAX, .top_down = false };
429
-
430
-	/*
431
-	 * Determine and load a segment for backup area. First 640K RAM
432
-	 * region is backup source
433
-	 */
434
-
435
-	ret = walk_system_ram_res(KEXEC_BACKUP_SRC_START, KEXEC_BACKUP_SRC_END,
436
-				image, determine_backup_region);
437
-
438
-	/* Zero or postive return values are ok */
439
-	if (ret < 0)
440
-		return ret;
441
-
442
-	/* Add backup segment. */
443
-	if (image->arch.backup_src_sz) {
444
-		kbuf.buffer = &crash_zero_bytes;
445
-		kbuf.bufsz = sizeof(crash_zero_bytes);
446
-		kbuf.memsz = image->arch.backup_src_sz;
447
-		kbuf.buf_align = PAGE_SIZE;
448
-		/*
449
-		 * Ideally there is no source for backup segment. This is
450
-		 * copied in purgatory after crash. Just add a zero filled
451
-		 * segment for now to make sure checksum logic works fine.
452
-		 */
453
-		ret = kexec_add_buffer(&kbuf);
454
-		if (ret)
455
-			return ret;
456
-		image->arch.backup_load_addr = kbuf.mem;
457
-		pr_debug("Loaded backup region at 0x%lx backup_start=0x%lx memsz=0x%lx\n",
458
-			 image->arch.backup_load_addr,
459
-			 image->arch.backup_src_start, kbuf.memsz);
460
-	}
461389 
462390 	/* Prepare elf headers and add a segment */
463391 	ret = prepare_elf_headers(image, &kbuf.buffer, &kbuf.bufsz);
....@@ -469,6 +397,7 @@
469397 
470398 	kbuf.memsz = kbuf.bufsz;
471399 	kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
400
+	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
472401 	ret = kexec_add_buffer(&kbuf);
473402 	if (ret) {
474403 		vfree((void *)image->arch.elf_headers);