]>
Commit | Line | Data |
---|---|---|
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 | ||
a33fd4c2 S |
52 | if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED) |
53 | ack_APIC_irq(); | |
54 | ||
6af7faf6 | 55 | exiting_irq(); |
1aec1696 TG |
56 | set_irq_regs(old_regs); |
57 | } | |
58 | ||
76d388cd | 59 | void hv_setup_vmbus_irq(void (*handler)(void)) |
1aec1696 TG |
60 | { |
61 | vmbus_handler = handler; | |
62 | /* | |
63 | * Setup the IDT for hypervisor callback. Prevent reallocation | |
64 | * at module reload. | |
65 | */ | |
66 | if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors)) | |
67 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, | |
68 | hyperv_callback_vector); | |
69 | } | |
70 | ||
76d388cd | 71 | void hv_remove_vmbus_irq(void) |
1aec1696 TG |
72 | { |
73 | /* We have no way to deallocate the interrupt gate */ | |
74 | vmbus_handler = NULL; | |
75 | } | |
76 | EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq); | |
77 | EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq); | |
2517281d VK |
78 | |
79 | void hv_setup_kexec_handler(void (*handler)(void)) | |
80 | { | |
81 | hv_kexec_handler = handler; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(hv_setup_kexec_handler); | |
84 | ||
85 | void hv_remove_kexec_handler(void) | |
86 | { | |
87 | hv_kexec_handler = NULL; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(hv_remove_kexec_handler); | |
b4370df2 VK |
90 | |
91 | void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)) | |
92 | { | |
93 | hv_crash_handler = handler; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(hv_setup_crash_handler); | |
96 | ||
97 | void hv_remove_crash_handler(void) | |
98 | { | |
99 | hv_crash_handler = NULL; | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(hv_remove_crash_handler); | |
1aec1696 | 102 | |
1e034743 | 103 | #ifdef CONFIG_KEXEC_CORE |
2517281d VK |
104 | static void hv_machine_shutdown(void) |
105 | { | |
106 | if (kexec_in_progress && hv_kexec_handler) | |
107 | hv_kexec_handler(); | |
108 | native_machine_shutdown(); | |
109 | } | |
110 | ||
b4370df2 VK |
111 | static void hv_machine_crash_shutdown(struct pt_regs *regs) |
112 | { | |
113 | if (hv_crash_handler) | |
114 | hv_crash_handler(regs); | |
115 | native_machine_crash_shutdown(regs); | |
116 | } | |
1e034743 VK |
117 | #endif /* CONFIG_KEXEC_CORE */ |
118 | #endif /* CONFIG_HYPERV */ | |
b4370df2 | 119 | |
9df56f19 | 120 | static uint32_t __init ms_hyperv_platform(void) |
a2a47c6c | 121 | { |
e08cae41 PA |
122 | u32 eax; |
123 | u32 hyp_signature[3]; | |
a2a47c6c | 124 | |
e08cae41 | 125 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
9df56f19 | 126 | return 0; |
a2a47c6c | 127 | |
e08cae41 PA |
128 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
129 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 130 | |
9df56f19 JW |
131 | if (eax >= HYPERV_CPUID_MIN && |
132 | eax <= HYPERV_CPUID_MAX && | |
133 | !memcmp("Microsoft Hv", hyp_signature, 12)) | |
134 | return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS; | |
135 | ||
136 | return 0; | |
a2a47c6c KS |
137 | } |
138 | ||
1e2ae9ec VK |
139 | static unsigned char hv_get_nmi_reason(void) |
140 | { | |
141 | return 0; | |
142 | } | |
143 | ||
59107e2f VK |
144 | #ifdef CONFIG_X86_LOCAL_APIC |
145 | /* | |
146 | * Prior to WS2016 Debug-VM sends NMIs to all CPUs which makes | |
147 | * it dificult to process CHANNELMSG_UNLOAD in case of crash. Handle | |
148 | * unknown NMI on the first CPU which gets it. | |
149 | */ | |
150 | static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs) | |
151 | { | |
152 | static atomic_t nmi_cpu = ATOMIC_INIT(-1); | |
153 | ||
154 | if (!unknown_nmi_panic) | |
155 | return NMI_DONE; | |
156 | ||
157 | if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1) | |
158 | return NMI_HANDLED; | |
159 | ||
160 | return NMI_DONE; | |
161 | } | |
162 | #endif | |
163 | ||
71c2a2d0 VK |
164 | static unsigned long hv_get_tsc_khz(void) |
165 | { | |
166 | unsigned long freq; | |
167 | ||
168 | rdmsrl(HV_X64_MSR_TSC_FREQUENCY, freq); | |
169 | ||
170 | return freq / 1000; | |
171 | } | |
172 | ||
e08cae41 | 173 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 174 | { |
8de8af7e S |
175 | int hv_host_info_eax; |
176 | int hv_host_info_ebx; | |
177 | int hv_host_info_ecx; | |
178 | int hv_host_info_edx; | |
179 | ||
a2a47c6c | 180 | /* |
e08cae41 | 181 | * Extract the features and hints |
a2a47c6c | 182 | */ |
e08cae41 | 183 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
cc2dd402 | 184 | ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES); |
e08cae41 | 185 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); |
a2a47c6c | 186 | |
1b74dde7 CY |
187 | pr_info("HyperV: features 0x%x, hints 0x%x\n", |
188 | ms_hyperv.features, ms_hyperv.hints); | |
6f4151c8 | 189 | |
8de8af7e S |
190 | /* |
191 | * Extract host information. | |
192 | */ | |
193 | if (cpuid_eax(HVCPUID_VENDOR_MAXFUNCTION) >= HVCPUID_VERSION) { | |
194 | hv_host_info_eax = cpuid_eax(HVCPUID_VERSION); | |
195 | hv_host_info_ebx = cpuid_ebx(HVCPUID_VERSION); | |
196 | hv_host_info_ecx = cpuid_ecx(HVCPUID_VERSION); | |
197 | hv_host_info_edx = cpuid_edx(HVCPUID_VERSION); | |
198 | ||
199 | pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d\n", | |
200 | hv_host_info_eax, hv_host_info_ebx >> 16, | |
201 | hv_host_info_ebx & 0xFFFF, hv_host_info_ecx, | |
202 | hv_host_info_edx >> 24, hv_host_info_edx & 0xFFFFFF); | |
203 | } | |
204 | ||
71c2a2d0 VK |
205 | if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS && |
206 | ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { | |
207 | x86_platform.calibrate_tsc = hv_get_tsc_khz; | |
208 | x86_platform.calibrate_cpu = hv_get_tsc_khz; | |
209 | } | |
210 | ||
90ab9d55 | 211 | #ifdef CONFIG_X86_LOCAL_APIC |
2cf02842 VK |
212 | if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS && |
213 | ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { | |
9e7827b5 S |
214 | /* |
215 | * Get the APIC frequency. | |
216 | */ | |
4c08edd3 PA |
217 | u64 hv_lapic_frequency; |
218 | ||
9e7827b5 S |
219 | rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency); |
220 | hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ); | |
221 | lapic_timer_frequency = hv_lapic_frequency; | |
1b74dde7 CY |
222 | pr_info("HyperV: LAPIC Timer Frequency: %#x\n", |
223 | lapic_timer_frequency); | |
9e7827b5 | 224 | } |
59107e2f VK |
225 | |
226 | register_nmi_handler(NMI_UNKNOWN, hv_nmi_unknown, NMI_FLAG_FIRST, | |
227 | "hv_nmi_unknown"); | |
90ab9d55 | 228 | #endif |
9e7827b5 | 229 | |
ca3ba2a2 JW |
230 | #ifdef CONFIG_X86_IO_APIC |
231 | no_timer_check = 1; | |
232 | #endif | |
233 | ||
1e034743 | 234 | #if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE) |
2517281d | 235 | machine_ops.shutdown = hv_machine_shutdown; |
b4370df2 | 236 | machine_ops.crash_shutdown = hv_machine_crash_shutdown; |
1e034743 | 237 | #endif |
88c9281a | 238 | mark_tsc_unstable("running on Hyper-V"); |
1e2ae9ec VK |
239 | |
240 | /* | |
241 | * Generation 2 instances don't support reading the NMI status from | |
242 | * 0x61 port. | |
243 | */ | |
244 | if (efi_enabled(EFI_BOOT)) | |
245 | x86_platform.get_nmi_reason = hv_get_nmi_reason; | |
8730046c S |
246 | |
247 | #if IS_ENABLED(CONFIG_HYPERV) | |
248 | /* | |
249 | * Setup the hook to get control post apic initialization. | |
250 | */ | |
251 | x86_platform.apic_post_init = hyperv_init; | |
252 | #endif | |
a2a47c6c | 253 | } |
e08cae41 | 254 | |
c24b0a22 JG |
255 | const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = { |
256 | .name = "Microsoft Hyper-V", | |
e08cae41 | 257 | .detect = ms_hyperv_platform, |
c24b0a22 | 258 | .type = X86_HYPER_MS_HYPERV, |
2d0b017b | 259 | .init.init_platform = ms_hyperv_init_platform, |
e08cae41 | 260 | }; |