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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6 
 kernel/arch/x86/kernel/cpu/amd.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 #include <linux/export.h>
23 #include <linux/bitops.h>
34 #include <linux/elf.h>
....@@ -7,14 +8,18 @@
78 #include <linux/sched.h>
89 #include <linux/sched/clock.h>
910 #include <linux/random.h>
11
+#include <linux/topology.h>
1012 #include <asm/processor.h>
1113 #include <asm/apic.h>
1214 #include <asm/cacheinfo.h>
1315 #include <asm/cpu.h>
1416 #include <asm/spec-ctrl.h>
1517 #include <asm/smp.h>
18
+#include <asm/numa.h>
1619 #include <asm/pci-direct.h>
1720 #include <asm/delay.h>
21
+#include <asm/debugreg.h>
22
+#include <asm/resctrl.h>
1823 
1924 #ifdef CONFIG_X86_64
2025 # include <asm/mmconfig.h>
....@@ -23,17 +28,89 @@
2328 
2429 #include "cpu.h"
2530 
26
-static const int amd_erratum_383[];
27
-static const int amd_erratum_400[];
28
-static const int amd_erratum_1054[];
29
-static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
30
-
3131 /*
3232  * nodes_per_socket: Stores the number of nodes per socket.
3333  * Refer to Fam15h Models 00-0fh BKDG - CPUID Fn8000_001E_ECX
3434  * Node Identifiers[10:8]
3535  */
3636 static u32 nodes_per_socket = 1;
37
+
38
+/*
39
+ * AMD errata checking
40
+ *
41
+ * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
42
+ * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
43
+ * have an OSVW id assigned, which it takes as first argument. Both take a
44
+ * variable number of family-specific model-stepping ranges created by
45
+ * AMD_MODEL_RANGE().
46
+ *
47
+ * Example:
48
+ *
49
+ * const int amd_erratum_319[] =
50
+ *	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
51
+ *			   AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
52
+ *			   AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
53
+ */
54
+
55
+#define AMD_LEGACY_ERRATUM(...)		{ -1, __VA_ARGS__, 0 }
56
+#define AMD_OSVW_ERRATUM(osvw_id, ...)	{ osvw_id, __VA_ARGS__, 0 }
57
+#define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
58
+	((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
59
+#define AMD_MODEL_RANGE_FAMILY(range)	(((range) >> 24) & 0xff)
60
+#define AMD_MODEL_RANGE_START(range)	(((range) >> 12) & 0xfff)
61
+#define AMD_MODEL_RANGE_END(range)	((range) & 0xfff)
62
+
63
+static const int amd_erratum_400[] =
64
+	AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
65
+			    AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
66
+
67
+static const int amd_erratum_383[] =
68
+	AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
69
+
70
+/* #1054: Instructions Retired Performance Counter May Be Inaccurate */
71
+static const int amd_erratum_1054[] =
72
+	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
73
+
74
+static const int amd_zenbleed[] =
75
+	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0x30, 0x0, 0x4f, 0xf),
76
+			   AMD_MODEL_RANGE(0x17, 0x60, 0x0, 0x7f, 0xf),
77
+			   AMD_MODEL_RANGE(0x17, 0x90, 0x0, 0x91, 0xf),
78
+			   AMD_MODEL_RANGE(0x17, 0xa0, 0x0, 0xaf, 0xf));
79
+
80
+static const int amd_div0[] =
81
+	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0x00, 0x0, 0x2f, 0xf),
82
+			   AMD_MODEL_RANGE(0x17, 0x50, 0x0, 0x5f, 0xf));
83
+
84
+static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
85
+{
86
+	int osvw_id = *erratum++;
87
+	u32 range;
88
+	u32 ms;
89
+
90
+	if (osvw_id >= 0 && osvw_id < 65536 &&
91
+	    cpu_has(cpu, X86_FEATURE_OSVW)) {
92
+		u64 osvw_len;
93
+
94
+		rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
95
+		if (osvw_id < osvw_len) {
96
+			u64 osvw_bits;
97
+
98
+			rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
99
+			    osvw_bits);
100
+			return osvw_bits & (1ULL << (osvw_id & 0x3f));
101
+		}
102
+	}
103
+
104
+	/* OSVW unavailable or ID unknown, match family-model-stepping range */
105
+	ms = (cpu->x86_model << 4) | cpu->x86_stepping;
106
+	while ((range = *erratum++))
107
+		if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
108
+		    (ms >= AMD_MODEL_RANGE_START(range)) &&
109
+		    (ms <= AMD_MODEL_RANGE_END(range)))
110
+			return true;
111
+
112
+	return false;
113
+}
37114 
38115 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
39116 {
....@@ -82,11 +159,14 @@
82159  *	performance at the same time..
83160  */
84161 
162
+#ifdef CONFIG_X86_32
85163 extern __visible void vide(void);
86
-__asm__(".globl vide\n"
164
+__asm__(".text\n"
165
+	".globl vide\n"
87166 	".type vide, @function\n"
88167 	".align 4\n"
89168 	"vide: ret\n");
169
+#endif
90170 
91171 static void init_amd_k5(struct cpuinfo_x86 *c)
92172 {
....@@ -314,13 +394,6 @@
314394 	c->cpu_core_id %= cus_per_node;
315395 }
316396 
317
-
318
-static void amd_get_topology_early(struct cpuinfo_x86 *c)
319
-{
320
-	if (cpu_has(c, X86_FEATURE_TOPOEXT))
321
-		smp_num_siblings = ((cpuid_ebx(0x8000001e) >> 8) & 0xff) + 1;
322
-}
323
-
324397 /*
325398  * Fixup core topology information for
326399  * (1) AMD multi-node processors
....@@ -329,7 +402,6 @@
329402  */
330403 static void amd_get_topology(struct cpuinfo_x86 *c)
331404 {
332
-	u8 node_id;
333405 	int cpu = smp_processor_id();
334406 
335407 	/* get information required for multi-node processors */
....@@ -339,7 +411,7 @@
339411 
340412 		cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
341413 
342
-		node_id  = ecx & 0xff;
414
+		c->cpu_die_id  = ecx & 0xff;
343415 
344416 		if (c->x86 == 0x15)
345417 			c->cu_id = ebx & 0xff;
....@@ -359,15 +431,15 @@
359431 		if (!err)
360432 			c->x86_coreid_bits = get_count_order(c->x86_max_cores);
361433 
362
-		cacheinfo_amd_init_llc_id(c, cpu, node_id);
434
+		cacheinfo_amd_init_llc_id(c, cpu);
363435 
364436 	} else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {
365437 		u64 value;
366438 
367439 		rdmsrl(MSR_FAM10H_NODE_ID, value);
368
-		node_id = value & 7;
440
+		c->cpu_die_id = value & 7;
369441 
370
-		per_cpu(cpu_llc_id, cpu) = node_id;
442
+		per_cpu(cpu_llc_id, cpu) = c->cpu_die_id;
371443 	} else
372444 		return;
373445 
....@@ -392,7 +464,36 @@
392464 	/* Convert the initial APIC ID into the socket ID */
393465 	c->phys_proc_id = c->initial_apicid >> bits;
394466 	/* use socket ID also for last level cache */
395
-	per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
467
+	per_cpu(cpu_llc_id, cpu) = c->cpu_die_id = c->phys_proc_id;
468
+}
469
+
470
+static void amd_detect_ppin(struct cpuinfo_x86 *c)
471
+{
472
+	unsigned long long val;
473
+
474
+	if (!cpu_has(c, X86_FEATURE_AMD_PPIN))
475
+		return;
476
+
477
+	/* When PPIN is defined in CPUID, still need to check PPIN_CTL MSR */
478
+	if (rdmsrl_safe(MSR_AMD_PPIN_CTL, &val))
479
+		goto clear_ppin;
480
+
481
+	/* PPIN is locked in disabled mode, clear feature bit */
482
+	if ((val & 3UL) == 1UL)
483
+		goto clear_ppin;
484
+
485
+	/* If PPIN is disabled, try to enable it */
486
+	if (!(val & 2UL)) {
487
+		wrmsrl_safe(MSR_AMD_PPIN_CTL,  val | 2UL);
488
+		rdmsrl_safe(MSR_AMD_PPIN_CTL, &val);
489
+	}
490
+
491
+	/* If PPIN_EN bit is 1, return from here; otherwise fall through */
492
+	if (val & 2UL)
493
+		return;
494
+
495
+clear_ppin:
496
+	clear_cpu_cap(c, X86_FEATURE_AMD_PPIN);
396497 }
397498 
398499 u16 amd_get_nb_id(int cpu)
....@@ -540,12 +641,12 @@
540641 		u32 ecx;
541642 
542643 		ecx = cpuid_ecx(0x8000001e);
543
-		nodes_per_socket = ((ecx >> 8) & 7) + 1;
644
+		__max_die_per_package = nodes_per_socket = ((ecx >> 8) & 7) + 1;
544645 	} else if (boot_cpu_has(X86_FEATURE_NODEID_MSR)) {
545646 		u64 value;
546647 
547648 		rdmsrl(MSR_FAM10H_NODE_ID, value);
548
-		nodes_per_socket = ((value >> 3) & 7) + 1;
649
+		__max_die_per_package = nodes_per_socket = ((value >> 3) & 7) + 1;
549650 	}
550651 
551652 	if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) &&
....@@ -569,6 +670,8 @@
569670 			x86_amd_ls_cfg_ssbd_mask = 1ULL << bit;
570671 		}
571672 	}
673
+
674
+	resctrl_cpu_detect(c);
572675 }
573676 
574677 static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
....@@ -582,7 +685,7 @@
582685 	 *	      If BIOS has not enabled SME then don't advertise the
583686 	 *	      SME feature (set in scattered.c).
584687 	 *   For SEV: If BIOS has not enabled SEV then don't advertise the
585
-	 *            SEV feature (set in scattered.c).
688
+	 *            SEV and SEV_ES feature (set in scattered.c).
586689 	 *
587690 	 *   In all cases, since support for SME and SEV requires long mode,
588691 	 *   don't advertise the feature under CONFIG_X86_32.
....@@ -613,6 +716,7 @@
613716 		setup_clear_cpu_cap(X86_FEATURE_SME);
614717 clear_sev:
615718 		setup_clear_cpu_cap(X86_FEATURE_SEV);
719
+		setup_clear_cpu_cap(X86_FEATURE_SEV_ES);
616720 	}
617721 }
618722 
....@@ -712,7 +816,8 @@
712816 		}
713817 	}
714818 
715
-	amd_get_topology_early(c);
819
+	if (cpu_has(c, X86_FEATURE_TOPOEXT))
820
+		smp_num_siblings = ((cpuid_ebx(0x8000001e) >> 8) & 0xff) + 1;
716821 }
717822 
718823 static void init_amd_k8(struct cpuinfo_x86 *c)
....@@ -788,8 +893,6 @@
788893 	if (cpu_has_amd_erratum(c, amd_erratum_383))
789894 		set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
790895 }
791
-
792
-#define MSR_AMD64_DE_CFG	0xC0011029
793896 
794897 static void init_amd_ln(struct cpuinfo_x86 *c)
795898 {
....@@ -881,16 +984,101 @@
881984 	clear_rdrand_cpuid_bit(c);
882985 }
883986 
987
+void init_spectral_chicken(struct cpuinfo_x86 *c)
988
+{
989
+#ifdef CONFIG_CPU_UNRET_ENTRY
990
+	u64 value;
991
+
992
+	/*
993
+	 * On Zen2 we offer this chicken (bit) on the altar of Speculation.
994
+	 *
995
+	 * This suppresses speculation from the middle of a basic block, i.e. it
996
+	 * suppresses non-branch predictions.
997
+	 *
998
+	 * We use STIBP as a heuristic to filter out Zen2 from the rest of F17H
999
+	 */
1000
+	if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && cpu_has(c, X86_FEATURE_AMD_STIBP)) {
1001
+		if (!rdmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, &value)) {
1002
+			value |= MSR_ZEN2_SPECTRAL_CHICKEN_BIT;
1003
+			wrmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, value);
1004
+		}
1005
+	}
1006
+#endif
1007
+	/*
1008
+	 * Work around Erratum 1386.  The XSAVES instruction malfunctions in
1009
+	 * certain circumstances on Zen1/2 uarch, and not all parts have had
1010
+	 * updated microcode at the time of writing (March 2023).
1011
+	 *
1012
+	 * Affected parts all have no supervisor XSAVE states, meaning that
1013
+	 * the XSAVEC instruction (which works fine) is equivalent.
1014
+	 */
1015
+	clear_cpu_cap(c, X86_FEATURE_XSAVES);
1016
+}
1017
+
8841018 static void init_amd_zn(struct cpuinfo_x86 *c)
8851019 {
8861020 	set_cpu_cap(c, X86_FEATURE_ZEN);
8871021 
888
-	/*
889
-	 * Fix erratum 1076: CPB feature bit not being set in CPUID.
890
-	 * Always set it, except when running under a hypervisor.
891
-	 */
892
-	if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && !cpu_has(c, X86_FEATURE_CPB))
893
-		set_cpu_cap(c, X86_FEATURE_CPB);
1022
+#ifdef CONFIG_NUMA
1023
+	node_reclaim_distance = 32;
1024
+#endif
1025
+
1026
+	/* Fix up CPUID bits, but only if not virtualised. */
1027
+	if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
1028
+
1029
+		/* Erratum 1076: CPB feature bit not being set in CPUID. */
1030
+		if (!cpu_has(c, X86_FEATURE_CPB))
1031
+			set_cpu_cap(c, X86_FEATURE_CPB);
1032
+
1033
+		/*
1034
+		 * Zen3 (Fam19 model < 0x10) parts are not susceptible to
1035
+		 * Branch Type Confusion, but predate the allocation of the
1036
+		 * BTC_NO bit.
1037
+		 */
1038
+		if (c->x86 == 0x19 && !cpu_has(c, X86_FEATURE_BTC_NO))
1039
+			set_cpu_cap(c, X86_FEATURE_BTC_NO);
1040
+	}
1041
+}
1042
+
1043
+static bool cpu_has_zenbleed_microcode(void)
1044
+{
1045
+	u32 good_rev = 0;
1046
+
1047
+	switch (boot_cpu_data.x86_model) {
1048
+	case 0x30 ... 0x3f: good_rev = 0x0830107a; break;
1049
+	case 0x60 ... 0x67: good_rev = 0x0860010b; break;
1050
+	case 0x68 ... 0x6f: good_rev = 0x08608105; break;
1051
+	case 0x70 ... 0x7f: good_rev = 0x08701032; break;
1052
+	case 0xa0 ... 0xaf: good_rev = 0x08a00008; break;
1053
+
1054
+	default:
1055
+		return false;
1056
+		break;
1057
+	}
1058
+
1059
+	if (boot_cpu_data.microcode < good_rev)
1060
+		return false;
1061
+
1062
+	return true;
1063
+}
1064
+
1065
+static void zenbleed_check(struct cpuinfo_x86 *c)
1066
+{
1067
+	if (!cpu_has_amd_erratum(c, amd_zenbleed))
1068
+		return;
1069
+
1070
+	if (cpu_has(c, X86_FEATURE_HYPERVISOR))
1071
+		return;
1072
+
1073
+	if (!cpu_has(c, X86_FEATURE_AVX))
1074
+		return;
1075
+
1076
+	if (!cpu_has_zenbleed_microcode()) {
1077
+		pr_notice_once("Zenbleed: please update your microcode for the most optimal fix\n");
1078
+		msr_set_bit(MSR_AMD64_DE_CFG, MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT);
1079
+	} else {
1080
+		msr_clear_bit(MSR_AMD64_DE_CFG, MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT);
1081
+	}
8941082 }
8951083 
8961084 static void init_amd(struct cpuinfo_x86 *c)
....@@ -922,7 +1110,9 @@
9221110 	case 0x12: init_amd_ln(c); break;
9231111 	case 0x15: init_amd_bd(c); break;
9241112 	case 0x16: init_amd_jg(c); break;
925
-	case 0x17: init_amd_zn(c); break;
1113
+	case 0x17: init_spectral_chicken(c);
1114
+		   fallthrough;
1115
+	case 0x19: init_amd_zn(c); break;
9261116 	}
9271117 
9281118 	/*
....@@ -937,36 +1127,22 @@
9371127 	amd_detect_cmp(c);
9381128 	amd_get_topology(c);
9391129 	srat_detect_node(c);
1130
+	amd_detect_ppin(c);
9401131 
9411132 	init_amd_cacheinfo(c);
9421133 
9431134 	if (cpu_has(c, X86_FEATURE_XMM2)) {
944
-		unsigned long long val;
945
-		int ret;
946
-
9471135 		/*
948
-		 * A serializing LFENCE has less overhead than MFENCE, so
949
-		 * use it for execution serialization.  On families which
1136
+		 * Use LFENCE for execution serialization.  On families which
9501137 		 * don't have that MSR, LFENCE is already serializing.
9511138 		 * msr_set_bit() uses the safe accessors, too, even if the MSR
9521139 		 * is not present.
9531140 		 */
954
-		msr_set_bit(MSR_F10H_DECFG,
955
-			    MSR_F10H_DECFG_LFENCE_SERIALIZE_BIT);
1141
+		msr_set_bit(MSR_AMD64_DE_CFG,
1142
+			    MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT);
9561143 
957
-		/*
958
-		 * Verify that the MSR write was successful (could be running
959
-		 * under a hypervisor) and only then assume that LFENCE is
960
-		 * serializing.
961
-		 */
962
-		ret = rdmsrl_safe(MSR_F10H_DECFG, &val);
963
-		if (!ret && (val & MSR_F10H_DECFG_LFENCE_SERIALIZE)) {
964
-			/* A serializing LFENCE stops RDTSC speculation */
965
-			set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
966
-		} else {
967
-			/* MFENCE stops RDTSC speculation */
968
-			set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
969
-		}
1144
+		/* A serializing LFENCE stops RDTSC speculation */
1145
+		set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
9701146 	}
9711147 
9721148 	/*
....@@ -995,6 +1171,13 @@
9951171 		msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
9961172 
9971173 	check_null_seg_clears_base(c);
1174
+
1175
+	zenbleed_check(c);
1176
+
1177
+	if (cpu_has_amd_erratum(c, amd_div0)) {
1178
+		pr_notice_once("AMD Zen1 DIV0 bug detected. Disable SMT for full protection.\n");
1179
+		setup_force_cpu_bug(X86_BUG_DIV0);
1180
+	}
9981181 }
9991182 
10001183 #ifdef CONFIG_X86_32
....@@ -1090,73 +1273,6 @@
10901273 
10911274 cpu_dev_register(amd_cpu_dev);
10921275 
1093
-/*
1094
- * AMD errata checking
1095
- *
1096
- * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
1097
- * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
1098
- * have an OSVW id assigned, which it takes as first argument. Both take a
1099
- * variable number of family-specific model-stepping ranges created by
1100
- * AMD_MODEL_RANGE().
1101
- *
1102
- * Example:
1103
- *
1104
- * const int amd_erratum_319[] =
1105
- *	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
1106
- *			   AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
1107
- *			   AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
1108
- */
1109
-
1110
-#define AMD_LEGACY_ERRATUM(...)		{ -1, __VA_ARGS__, 0 }
1111
-#define AMD_OSVW_ERRATUM(osvw_id, ...)	{ osvw_id, __VA_ARGS__, 0 }
1112
-#define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
1113
-	((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
1114
-#define AMD_MODEL_RANGE_FAMILY(range)	(((range) >> 24) & 0xff)
1115
-#define AMD_MODEL_RANGE_START(range)	(((range) >> 12) & 0xfff)
1116
-#define AMD_MODEL_RANGE_END(range)	((range) & 0xfff)
1117
-
1118
-static const int amd_erratum_400[] =
1119
-	AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
1120
-			    AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
1121
-
1122
-static const int amd_erratum_383[] =
1123
-	AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
1124
-
1125
-/* #1054: Instructions Retired Performance Counter May Be Inaccurate */
1126
-static const int amd_erratum_1054[] =
1127
-	AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
1128
-
1129
-static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
1130
-{
1131
-	int osvw_id = *erratum++;
1132
-	u32 range;
1133
-	u32 ms;
1134
-
1135
-	if (osvw_id >= 0 && osvw_id < 65536 &&
1136
-	    cpu_has(cpu, X86_FEATURE_OSVW)) {
1137
-		u64 osvw_len;
1138
-
1139
-		rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
1140
-		if (osvw_id < osvw_len) {
1141
-			u64 osvw_bits;
1142
-
1143
-			rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
1144
-			    osvw_bits);
1145
-			return osvw_bits & (1ULL << (osvw_id & 0x3f));
1146
-		}
1147
-	}
1148
-
1149
-	/* OSVW unavailable or ID unknown, match family-model-stepping range */
1150
-	ms = (cpu->x86_model << 4) | cpu->x86_stepping;
1151
-	while ((range = *erratum++))
1152
-		if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
1153
-		    (ms >= AMD_MODEL_RANGE_START(range)) &&
1154
-		    (ms <= AMD_MODEL_RANGE_END(range)))
1155
-			return true;
1156
-
1157
-	return false;
1158
-}
1159
-
11601276 void set_dr_addr_mask(unsigned long mask, int dr)
11611277 {
11621278 	if (!boot_cpu_has(X86_FEATURE_BPEXT))
....@@ -1175,3 +1291,45 @@
11751291 		break;
11761292 	}
11771293 }
1294
+
1295
+bool cpu_has_ibpb_brtype_microcode(void)
1296
+{
1297
+	switch (boot_cpu_data.x86) {
1298
+	/* Zen1/2 IBPB flushes branch type predictions too. */
1299
+	case 0x17:
1300
+		return boot_cpu_has(X86_FEATURE_AMD_IBPB);
1301
+	case 0x19:
1302
+		/* Poke the MSR bit on Zen3/4 to check its presence. */
1303
+		if (!wrmsrl_safe(MSR_IA32_PRED_CMD, PRED_CMD_SBPB)) {
1304
+			setup_force_cpu_cap(X86_FEATURE_SBPB);
1305
+			return true;
1306
+		} else {
1307
+			return false;
1308
+		}
1309
+	default:
1310
+		return false;
1311
+	}
1312
+}
1313
+
1314
+static void zenbleed_check_cpu(void *unused)
1315
+{
1316
+	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
1317
+
1318
+	zenbleed_check(c);
1319
+}
1320
+
1321
+void amd_check_microcode(void)
1322
+{
1323
+	on_each_cpu(zenbleed_check_cpu, NULL, 1);
1324
+}
1325
+
1326
+/*
1327
+ * Issue a DIV 0/1 insn to clear any division data from previous DIV
1328
+ * operations.
1329
+ */
1330
+void noinstr amd_clear_divider(void)
1331
+{
1332
+	asm volatile(ALTERNATIVE("", "div %2\n\t", X86_BUG_DIV0)
1333
+		     :: "a" (0), "d" (0), "r" (1));
1334
+}
1335
+EXPORT_SYMBOL_GPL(amd_clear_divider);