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2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29 
 kernel/arch/x86/platform/efi/quirks.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 #define pr_fmt(fmt) "efi: " fmt
23 
34 #include <linux/init.h>
....@@ -8,7 +9,6 @@
89 #include <linux/efi.h>
910 #include <linux/slab.h>
1011 #include <linux/memblock.h>
11
-#include <linux/bootmem.h>
1212 #include <linux/acpi.h>
1313 #include <linux/dmi.h>
1414 
....@@ -16,6 +16,8 @@
1616 #include <asm/efi.h>
1717 #include <asm/uv/uv.h>
1818 #include <asm/cpu_device_id.h>
19
+#include <asm/realmode.h>
20
+#include <asm/reboot.h>
1921 
2022 #define EFI_MIN_RESERVE 5120
2123 
....@@ -242,7 +244,7 @@
242244  */
243245 void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
244246 {
245
-	phys_addr_t new_phys, new_size;
247
+	struct efi_memory_map_data data = { 0 };
246248 	struct efi_mem_range mr;
247249 	efi_memory_desc_t md;
248250 	int num_entries;
....@@ -270,15 +272,12 @@
270272 	num_entries = efi_memmap_split_count(&md, &mr.range);
271273 	num_entries += efi.memmap.nr_map;
272274 
273
-	new_size = efi.memmap.desc_size * num_entries;
274
-
275
-	new_phys = efi_memmap_alloc(num_entries);
276
-	if (!new_phys) {
275
+	if (efi_memmap_alloc(num_entries, &data) != 0) {
277276 		pr_err("Could not allocate boot services memmap\n");
278277 		return;
279278 	}
280279 
281
-	new = early_memremap_prot(new_phys, new_size,
280
+	new = early_memremap_prot(data.phys_map, data.size,
282281 				  pgprot_val(pgprot_encrypted(FIXMAP_PAGE_NORMAL)));
283282 	if (!new) {
284283 		pr_err("Failed to map new boot services memmap\n");
....@@ -286,9 +285,9 @@
286285 	}
287286 
288287 	efi_memmap_insert(&efi.memmap, new, &mr);
289
-	early_memunmap(new, new_size);
288
+	early_memunmap(new, data.size);
290289 
291
-	efi_memmap_install(new_phys, num_entries);
290
+	efi_memmap_install(&data);
292291 	e820__range_update(addr, size, E820_TYPE_RAM, E820_TYPE_RESERVED);
293292 	e820__update_table(e820_table);
294293 }
....@@ -303,7 +302,7 @@
303302  * - Not within any part of the kernel
304303  * - Not the BIOS reserved area (E820_TYPE_RESERVED, E820_TYPE_NVS, etc)
305304  */
306
-static bool can_free_region(u64 start, u64 size)
305
+static __init bool can_free_region(u64 start, u64 size)
307306 {
308307 	if (start + size > __pa_symbol(_text) && start <= __pa_symbol(_end))
309308 		return false;
....@@ -318,6 +317,9 @@
318317 {
319318 	efi_memory_desc_t *md;
320319 
320
+	if (!efi_enabled(EFI_MEMMAP))
321
+		return;
322
+
321323 	for_each_efi_memory_desc(md) {
322324 		u64 start = md->phys_addr;
323325 		u64 size = md->num_pages << EFI_PAGE_SHIFT;
....@@ -331,7 +333,7 @@
331333 
332334 		/*
333335 		 * Because the following memblock_reserve() is paired
334
-		 * with free_bootmem_late() for this region in
336
+		 * with memblock_free_late() for this region in
335337 		 * efi_free_boot_services(), we must be extremely
336338 		 * careful not to reserve, and subsequently free,
337339 		 * critical regions of memory (like the kernel image) or
....@@ -362,18 +364,48 @@
362364 		 * doesn't make sense as far as the firmware is
363365 		 * concerned, but it does provide us with a way to tag
364366 		 * those regions that must not be paired with
365
-		 * free_bootmem_late().
367
+		 * memblock_free_late().
366368 		 */
367369 		md->attribute |= EFI_MEMORY_RUNTIME;
368370 	}
369371 }
370372 
373
+/*
374
+ * Apart from having VA mappings for EFI boot services code/data regions,
375
+ * (duplicate) 1:1 mappings were also created as a quirk for buggy firmware. So,
376
+ * unmap both 1:1 and VA mappings.
377
+ */
378
+static void __init efi_unmap_pages(efi_memory_desc_t *md)
379
+{
380
+	pgd_t *pgd = efi_mm.pgd;
381
+	u64 pa = md->phys_addr;
382
+	u64 va = md->virt_addr;
383
+
384
+	/*
385
+	 * EFI mixed mode has all RAM mapped to access arguments while making
386
+	 * EFI runtime calls, hence don't unmap EFI boot services code/data
387
+	 * regions.
388
+	 */
389
+	if (efi_is_mixed())
390
+		return;
391
+
392
+	if (kernel_unmap_pages_in_pgd(pgd, pa, md->num_pages))
393
+		pr_err("Failed to unmap 1:1 mapping for 0x%llx\n", pa);
394
+
395
+	if (kernel_unmap_pages_in_pgd(pgd, va, md->num_pages))
396
+		pr_err("Failed to unmap VA mapping for 0x%llx\n", va);
397
+}
398
+
371399 void __init efi_free_boot_services(void)
372400 {
373
-	phys_addr_t new_phys, new_size;
401
+	struct efi_memory_map_data data = { 0 };
374402 	efi_memory_desc_t *md;
375403 	int num_entries = 0;
376404 	void *new, *new_md;
405
+
406
+	/* Keep all regions for /sys/kernel/debug/efi */
407
+	if (efi_enabled(EFI_DBG))
408
+		return;
377409 
378410 	for_each_efi_memory_desc(md) {
379411 		unsigned long long start = md->phys_addr;
....@@ -393,6 +425,13 @@
393425 		}
394426 
395427 		/*
428
+		 * Before calling set_virtual_address_map(), EFI boot services
429
+		 * code/data regions were mapped as a quirk for buggy firmware.
430
+		 * Unmap them from efi_pgd before freeing them up.
431
+		 */
432
+		efi_unmap_pages(md);
433
+
434
+		/*
396435 		 * Nasty quirk: if all sub-1MB memory is used for boot
397436 		 * services, we can get here without having allocated the
398437 		 * real mode trampoline.  It's too late to hand boot services
....@@ -407,25 +446,23 @@
407446 		 */
408447 		rm_size = real_mode_size_needed();
409448 		if (rm_size && (start + rm_size) < (1<<20) && size >= rm_size) {
410
-			set_real_mode_mem(start, rm_size);
449
+			set_real_mode_mem(start);
411450 			start += rm_size;
412451 			size -= rm_size;
413452 		}
414453 
415
-		free_bootmem_late(start, size);
454
+		memblock_free_late(start, size);
416455 	}
417456 
418457 	if (!num_entries)
419458 		return;
420459 
421
-	new_size = efi.memmap.desc_size * num_entries;
422
-	new_phys = efi_memmap_alloc(num_entries);
423
-	if (!new_phys) {
460
+	if (efi_memmap_alloc(num_entries, &data) != 0) {
424461 		pr_err("Failed to allocate new EFI memmap\n");
425462 		return;
426463 	}
427464 
428
-	new = memremap(new_phys, new_size, MEMREMAP_WB);
465
+	new = memremap(data.phys_map, data.size, MEMREMAP_WB);
429466 	if (!new) {
430467 		pr_err("Failed to map new EFI memmap\n");
431468 		return;
....@@ -449,7 +486,7 @@
449486 
450487 	memunmap(new);
451488 
452
-	if (efi_memmap_install(new_phys, num_entries)) {
489
+	if (efi_memmap_install(&data) != 0) {
453490 		pr_err("Could not install new EFI memmap\n");
454491 		return;
455492 	}
....@@ -469,6 +506,9 @@
469506 	int i, sz, ret = 0;
470507 	void *p, *tablep;
471508 	struct efi_setup_data *data;
509
+
510
+	if (nr_tables == 0)
511
+		return 0;
472512 
473513 	if (!efi_setup)
474514 		return 0;
....@@ -494,7 +534,7 @@
494534 		goto out_memremap;
495535 	}
496536 
497
-	for (i = 0; i < efi.systab->nr_tables; i++) {
537
+	for (i = 0; i < nr_tables; i++) {
498538 		efi_guid_t guid;
499539 
500540 		guid = ((efi_config_table_64_t *)p)->guid;
....@@ -511,16 +551,6 @@
511551 	return ret;
512552 }
513553 
514
-static const struct dmi_system_id sgi_uv1_dmi[] = {
515
-	{ NULL, "SGI UV1",
516
-		{	DMI_MATCH(DMI_PRODUCT_NAME,	"Stoutland Platform"),
517
-			DMI_MATCH(DMI_PRODUCT_VERSION,	"1.0"),
518
-			DMI_MATCH(DMI_BIOS_VENDOR,	"SGI.COM"),
519
-		}
520
-	},
521
-	{ } /* NULL entry stops DMI scanning */
522
-};
523
-
524554 void __init efi_apply_memmap_quirks(void)
525555 {
526556 	/*
....@@ -532,10 +562,6 @@
532562 		pr_info("Setup done, disabling due to 32/64-bit mismatch\n");
533563 		efi_memmap_unmap();
534564 	}
535
-
536
-	/* UV2+ BIOS has a fix for this issue.  UV1 still needs the quirk. */
537
-	if (dmi_check_system(sgi_uv1_dmi))
538
-		set_bit(EFI_OLD_MEMMAP, &efi.flags);
539565 }
540566 
541567 /*
....@@ -609,12 +635,9 @@
609635 	return 1;
610636 }
611637 
612
-#define ICPU(family, model, quirk_handler) \
613
-	{ X86_VENDOR_INTEL, family, model, X86_FEATURE_ANY, \
614
-	  (unsigned long)&quirk_handler }
615
-
616638 static const struct x86_cpu_id efi_capsule_quirk_ids[] = {
617
-	ICPU(5, 9, qrk_capsule_setup_info),	/* Intel Quark X1000 */
639
+	X86_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000,
640
+				   &qrk_capsule_setup_info),
618641 	{ }
619642 };
620643 
....@@ -653,3 +676,78 @@
653676 }
654677 
655678 #endif
679
+
680
+/*
681
+ * If any access by any efi runtime service causes a page fault, then,
682
+ * 1. If it's efi_reset_system(), reboot through BIOS.
683
+ * 2. If any other efi runtime service, then
684
+ *    a. Return error status to the efi caller process.
685
+ *    b. Disable EFI Runtime Services forever and
686
+ *    c. Freeze efi_rts_wq and schedule new process.
687
+ *
688
+ * @return: Returns, if the page fault is not handled. This function
689
+ * will never return if the page fault is handled successfully.
690
+ */
691
+void efi_recover_from_page_fault(unsigned long phys_addr)
692
+{
693
+	if (!IS_ENABLED(CONFIG_X86_64))
694
+		return;
695
+
696
+	/*
697
+	 * Make sure that an efi runtime service caused the page fault.
698
+	 */
699
+	if (efi_rts_work.efi_rts_id == EFI_NONE)
700
+		return;
701
+
702
+	/*
703
+	 * Address range 0x0000 - 0x0fff is always mapped in the efi_pgd, so
704
+	 * page faulting on these addresses isn't expected.
705
+	 */
706
+	if (phys_addr <= 0x0fff)
707
+		return;
708
+
709
+	/*
710
+	 * Print stack trace as it might be useful to know which EFI Runtime
711
+	 * Service is buggy.
712
+	 */
713
+	WARN(1, FW_BUG "Page fault caused by firmware at PA: 0x%lx\n",
714
+	     phys_addr);
715
+
716
+	/*
717
+	 * Buggy efi_reset_system() is handled differently from other EFI
718
+	 * Runtime Services as it doesn't use efi_rts_wq. Although,
719
+	 * native_machine_emergency_restart() says that machine_real_restart()
720
+	 * could fail, it's better not to compilcate this fault handler
721
+	 * because this case occurs *very* rarely and hence could be improved
722
+	 * on a need by basis.
723
+	 */
724
+	if (efi_rts_work.efi_rts_id == EFI_RESET_SYSTEM) {
725
+		pr_info("efi_reset_system() buggy! Reboot through BIOS\n");
726
+		machine_real_restart(MRR_BIOS);
727
+		return;
728
+	}
729
+
730
+	/*
731
+	 * Before calling EFI Runtime Service, the kernel has switched the
732
+	 * calling process to efi_mm. Hence, switch back to task_mm.
733
+	 */
734
+	arch_efi_call_virt_teardown();
735
+
736
+	/* Signal error status to the efi caller process */
737
+	efi_rts_work.status = EFI_ABORTED;
738
+	complete(&efi_rts_work.efi_rts_comp);
739
+
740
+	clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
741
+	pr_info("Froze efi_rts_wq and disabled EFI Runtime Services\n");
742
+
743
+	/*
744
+	 * Call schedule() in an infinite loop, so that any spurious wake ups
745
+	 * will never run efi_rts_wq again.
746
+	 */
747
+	for (;;) {
748
+		set_current_state(TASK_IDLE);
749
+		schedule();
750
+	}
751
+
752
+	return;
753
+}