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Commit | Line | Data |
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a2a47c6c KS |
1 | /* |
2 | * HyperV Detection code. | |
3 | * | |
4 | * Copyright (C) 2010, Novell, Inc. | |
5 | * Author : K. Y. Srinivasan <ksrinivasan@novell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9fa02317 | 9 | * the Free Software Foundation; version 2 of the License. |
a2a47c6c KS |
10 | * |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
6f4151c8 S |
14 | #include <linux/time.h> |
15 | #include <linux/clocksource.h> | |
186f4360 PG |
16 | #include <linux/init.h> |
17 | #include <linux/export.h> | |
bc2b0331 | 18 | #include <linux/hardirq.h> |
9e7827b5 | 19 | #include <linux/efi.h> |
bc2b0331 | 20 | #include <linux/interrupt.h> |
1aec1696 | 21 | #include <linux/irq.h> |
2517281d | 22 | #include <linux/kexec.h> |
a2a47c6c | 23 | #include <asm/processor.h> |
e08cae41 | 24 | #include <asm/hypervisor.h> |
a2a47c6c KS |
25 | #include <asm/hyperv.h> |
26 | #include <asm/mshyperv.h> | |
bc2b0331 | 27 | #include <asm/desc.h> |
bc2b0331 | 28 | #include <asm/irq_regs.h> |
9e7827b5 | 29 | #include <asm/i8259.h> |
d68ce017 | 30 | #include <asm/apic.h> |
ca3ba2a2 | 31 | #include <asm/timer.h> |
2517281d | 32 | #include <asm/reboot.h> |
59107e2f | 33 | #include <asm/nmi.h> |
a2a47c6c | 34 | |
e08cae41 | 35 | struct ms_hyperv_info ms_hyperv; |
9279aa55 | 36 | EXPORT_SYMBOL_GPL(ms_hyperv); |
a2a47c6c | 37 | |
3c433679 | 38 | #if IS_ENABLED(CONFIG_HYPERV) |
76d388cd | 39 | static void (*vmbus_handler)(void); |
1e034743 VK |
40 | static void (*hv_kexec_handler)(void); |
41 | static void (*hv_crash_handler)(struct pt_regs *regs); | |
1aec1696 TG |
42 | |
43 | void hyperv_vector_handler(struct pt_regs *regs) | |
44 | { | |
45 | struct pt_regs *old_regs = set_irq_regs(regs); | |
46 | ||
6af7faf6 | 47 | entering_irq(); |
1aec1696 TG |
48 | inc_irq_stat(irq_hv_callback_count); |
49 | if (vmbus_handler) | |
50 | vmbus_handler(); | |
51 | ||
6af7faf6 | 52 | exiting_irq(); |
1aec1696 TG |
53 | set_irq_regs(old_regs); |
54 | } | |
55 | ||
76d388cd | 56 | void hv_setup_vmbus_irq(void (*handler)(void)) |
1aec1696 TG |
57 | { |
58 | vmbus_handler = handler; | |
59 | /* | |
60 | * Setup the IDT for hypervisor callback. Prevent reallocation | |
61 | * at module reload. | |
62 | */ | |
63 | if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors)) | |
64 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, | |
65 | hyperv_callback_vector); | |
66 | } | |
67 | ||
76d388cd | 68 | void hv_remove_vmbus_irq(void) |
1aec1696 TG |
69 | { |
70 | /* We have no way to deallocate the interrupt gate */ | |
71 | vmbus_handler = NULL; | |
72 | } | |
73 | EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq); | |
74 | EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq); | |
2517281d VK |
75 | |
76 | void hv_setup_kexec_handler(void (*handler)(void)) | |
77 | { | |
78 | hv_kexec_handler = handler; | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(hv_setup_kexec_handler); | |
81 | ||
82 | void hv_remove_kexec_handler(void) | |
83 | { | |
84 | hv_kexec_handler = NULL; | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(hv_remove_kexec_handler); | |
b4370df2 VK |
87 | |
88 | void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)) | |
89 | { | |
90 | hv_crash_handler = handler; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(hv_setup_crash_handler); | |
93 | ||
94 | void hv_remove_crash_handler(void) | |
95 | { | |
96 | hv_crash_handler = NULL; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(hv_remove_crash_handler); | |
1aec1696 | 99 | |
1e034743 | 100 | #ifdef CONFIG_KEXEC_CORE |
2517281d VK |
101 | static void hv_machine_shutdown(void) |
102 | { | |
103 | if (kexec_in_progress && hv_kexec_handler) | |
104 | hv_kexec_handler(); | |
105 | native_machine_shutdown(); | |
106 | } | |
107 | ||
b4370df2 VK |
108 | static void hv_machine_crash_shutdown(struct pt_regs *regs) |
109 | { | |
110 | if (hv_crash_handler) | |
111 | hv_crash_handler(regs); | |
112 | native_machine_crash_shutdown(regs); | |
113 | } | |
1e034743 VK |
114 | #endif /* CONFIG_KEXEC_CORE */ |
115 | #endif /* CONFIG_HYPERV */ | |
b4370df2 | 116 | |
9df56f19 | 117 | static uint32_t __init ms_hyperv_platform(void) |
a2a47c6c | 118 | { |
e08cae41 PA |
119 | u32 eax; |
120 | u32 hyp_signature[3]; | |
a2a47c6c | 121 | |
e08cae41 | 122 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
9df56f19 | 123 | return 0; |
a2a47c6c | 124 | |
e08cae41 PA |
125 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
126 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 127 | |
9df56f19 JW |
128 | if (eax >= HYPERV_CPUID_MIN && |
129 | eax <= HYPERV_CPUID_MAX && | |
130 | !memcmp("Microsoft Hv", hyp_signature, 12)) | |
131 | return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS; | |
132 | ||
133 | return 0; | |
a2a47c6c KS |
134 | } |
135 | ||
a5a1d1c2 | 136 | static u64 read_hv_clock(struct clocksource *arg) |
6f4151c8 | 137 | { |
a5a1d1c2 | 138 | u64 current_tick; |
6f4151c8 S |
139 | /* |
140 | * Read the partition counter to get the current tick count. This count | |
141 | * is set to 0 when the partition is created and is incremented in | |
142 | * 100 nanosecond units. | |
143 | */ | |
144 | rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); | |
145 | return current_tick; | |
146 | } | |
147 | ||
148 | static struct clocksource hyperv_cs = { | |
149 | .name = "hyperv_clocksource", | |
150 | .rating = 400, /* use this when running on Hyperv*/ | |
151 | .read = read_hv_clock, | |
152 | .mask = CLOCKSOURCE_MASK(64), | |
32c6590d | 153 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
6f4151c8 S |
154 | }; |
155 | ||
1e2ae9ec VK |
156 | static unsigned char hv_get_nmi_reason(void) |
157 | { | |
158 | return 0; | |
159 | } | |
160 | ||
59107e2f VK |
161 | #ifdef CONFIG_X86_LOCAL_APIC |
162 | /* | |
163 | * Prior to WS2016 Debug-VM sends NMIs to all CPUs which makes | |
164 | * it dificult to process CHANNELMSG_UNLOAD in case of crash. Handle | |
165 | * unknown NMI on the first CPU which gets it. | |
166 | */ | |
167 | static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs) | |
168 | { | |
169 | static atomic_t nmi_cpu = ATOMIC_INIT(-1); | |
170 | ||
171 | if (!unknown_nmi_panic) | |
172 | return NMI_DONE; | |
173 | ||
174 | if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1) | |
175 | return NMI_HANDLED; | |
176 | ||
177 | return NMI_DONE; | |
178 | } | |
179 | #endif | |
180 | ||
e08cae41 | 181 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 182 | { |
a2a47c6c | 183 | /* |
e08cae41 | 184 | * Extract the features and hints |
a2a47c6c | 185 | */ |
e08cae41 | 186 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
cc2dd402 | 187 | ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES); |
e08cae41 | 188 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); |
a2a47c6c | 189 | |
1b74dde7 CY |
190 | pr_info("HyperV: features 0x%x, hints 0x%x\n", |
191 | ms_hyperv.features, ms_hyperv.hints); | |
6f4151c8 | 192 | |
90ab9d55 | 193 | #ifdef CONFIG_X86_LOCAL_APIC |
9e7827b5 S |
194 | if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) { |
195 | /* | |
196 | * Get the APIC frequency. | |
197 | */ | |
4c08edd3 PA |
198 | u64 hv_lapic_frequency; |
199 | ||
9e7827b5 S |
200 | rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency); |
201 | hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ); | |
202 | lapic_timer_frequency = hv_lapic_frequency; | |
1b74dde7 CY |
203 | pr_info("HyperV: LAPIC Timer Frequency: %#x\n", |
204 | lapic_timer_frequency); | |
9e7827b5 | 205 | } |
59107e2f VK |
206 | |
207 | register_nmi_handler(NMI_UNKNOWN, hv_nmi_unknown, NMI_FLAG_FIRST, | |
208 | "hv_nmi_unknown"); | |
90ab9d55 | 209 | #endif |
9e7827b5 | 210 | |
32068f65 OH |
211 | if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE) |
212 | clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100); | |
ca3ba2a2 JW |
213 | |
214 | #ifdef CONFIG_X86_IO_APIC | |
215 | no_timer_check = 1; | |
216 | #endif | |
217 | ||
1e034743 | 218 | #if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE) |
2517281d | 219 | machine_ops.shutdown = hv_machine_shutdown; |
b4370df2 | 220 | machine_ops.crash_shutdown = hv_machine_crash_shutdown; |
1e034743 | 221 | #endif |
88c9281a | 222 | mark_tsc_unstable("running on Hyper-V"); |
1e2ae9ec VK |
223 | |
224 | /* | |
225 | * Generation 2 instances don't support reading the NMI status from | |
226 | * 0x61 port. | |
227 | */ | |
228 | if (efi_enabled(EFI_BOOT)) | |
229 | x86_platform.get_nmi_reason = hv_get_nmi_reason; | |
a2a47c6c | 230 | } |
e08cae41 PA |
231 | |
232 | const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { | |
233 | .name = "Microsoft HyperV", | |
234 | .detect = ms_hyperv_platform, | |
235 | .init_platform = ms_hyperv_init_platform, | |
236 | }; | |
96f6e775 | 237 | EXPORT_SYMBOL(x86_hyper_ms_hyperv); |