This source file includes following definitions.
- hyperv_vector_handler
- hv_setup_vmbus_irq
- hv_remove_vmbus_irq
- hv_stimer0_vector_handler
- hv_setup_stimer0_irq
- hv_remove_stimer0_irq
- hv_setup_kexec_handler
- hv_remove_kexec_handler
- hv_setup_crash_handler
- hv_remove_crash_handler
- hv_machine_shutdown
- hv_machine_crash_shutdown
- ms_hyperv_platform
- hv_get_nmi_reason
- hv_nmi_unknown
- hv_get_tsc_khz
- hv_smp_prepare_boot_cpu
- ms_hyperv_init_platform
- hv_setup_sched_clock
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9 #include <linux/types.h>
10 #include <linux/time.h>
11 #include <linux/clocksource.h>
12 #include <linux/init.h>
13 #include <linux/export.h>
14 #include <linux/hardirq.h>
15 #include <linux/efi.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/kexec.h>
19 #include <linux/i8253.h>
20 #include <linux/random.h>
21 #include <asm/processor.h>
22 #include <asm/hypervisor.h>
23 #include <asm/hyperv-tlfs.h>
24 #include <asm/mshyperv.h>
25 #include <asm/desc.h>
26 #include <asm/irq_regs.h>
27 #include <asm/i8259.h>
28 #include <asm/apic.h>
29 #include <asm/timer.h>
30 #include <asm/reboot.h>
31 #include <asm/nmi.h>
32 #include <clocksource/hyperv_timer.h>
33
34 struct ms_hyperv_info ms_hyperv;
35 EXPORT_SYMBOL_GPL(ms_hyperv);
36
37 #if IS_ENABLED(CONFIG_HYPERV)
38 static void (*vmbus_handler)(void);
39 static void (*hv_stimer0_handler)(void);
40 static void (*hv_kexec_handler)(void);
41 static void (*hv_crash_handler)(struct pt_regs *regs);
42
43 __visible void __irq_entry hyperv_vector_handler(struct pt_regs *regs)
44 {
45 struct pt_regs *old_regs = set_irq_regs(regs);
46
47 entering_irq();
48 inc_irq_stat(irq_hv_callback_count);
49 if (vmbus_handler)
50 vmbus_handler();
51
52 if (ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED)
53 ack_APIC_irq();
54
55 exiting_irq();
56 set_irq_regs(old_regs);
57 }
58
59 void hv_setup_vmbus_irq(void (*handler)(void))
60 {
61 vmbus_handler = handler;
62 }
63
64 void hv_remove_vmbus_irq(void)
65 {
66
67 vmbus_handler = NULL;
68 }
69 EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq);
70 EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq);
71
72
73
74
75
76
77 __visible void __irq_entry hv_stimer0_vector_handler(struct pt_regs *regs)
78 {
79 struct pt_regs *old_regs = set_irq_regs(regs);
80
81 entering_irq();
82 inc_irq_stat(hyperv_stimer0_count);
83 if (hv_stimer0_handler)
84 hv_stimer0_handler();
85 add_interrupt_randomness(HYPERV_STIMER0_VECTOR, 0);
86 ack_APIC_irq();
87
88 exiting_irq();
89 set_irq_regs(old_regs);
90 }
91
92 int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void))
93 {
94 *vector = HYPERV_STIMER0_VECTOR;
95 *irq = -1;
96 hv_stimer0_handler = handler;
97 return 0;
98 }
99 EXPORT_SYMBOL_GPL(hv_setup_stimer0_irq);
100
101 void hv_remove_stimer0_irq(int irq)
102 {
103
104 hv_stimer0_handler = NULL;
105 }
106 EXPORT_SYMBOL_GPL(hv_remove_stimer0_irq);
107
108 void hv_setup_kexec_handler(void (*handler)(void))
109 {
110 hv_kexec_handler = handler;
111 }
112 EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);
113
114 void hv_remove_kexec_handler(void)
115 {
116 hv_kexec_handler = NULL;
117 }
118 EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);
119
120 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))
121 {
122 hv_crash_handler = handler;
123 }
124 EXPORT_SYMBOL_GPL(hv_setup_crash_handler);
125
126 void hv_remove_crash_handler(void)
127 {
128 hv_crash_handler = NULL;
129 }
130 EXPORT_SYMBOL_GPL(hv_remove_crash_handler);
131
132 #ifdef CONFIG_KEXEC_CORE
133 static void hv_machine_shutdown(void)
134 {
135 if (kexec_in_progress && hv_kexec_handler)
136 hv_kexec_handler();
137 native_machine_shutdown();
138 }
139
140 static void hv_machine_crash_shutdown(struct pt_regs *regs)
141 {
142 if (hv_crash_handler)
143 hv_crash_handler(regs);
144 native_machine_crash_shutdown(regs);
145 }
146 #endif
147 #endif
148
149 static uint32_t __init ms_hyperv_platform(void)
150 {
151 u32 eax;
152 u32 hyp_signature[3];
153
154 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
155 return 0;
156
157 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
158 &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
159
160 if (eax >= HYPERV_CPUID_MIN &&
161 eax <= HYPERV_CPUID_MAX &&
162 !memcmp("Microsoft Hv", hyp_signature, 12))
163 return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS;
164
165 return 0;
166 }
167
168 static unsigned char hv_get_nmi_reason(void)
169 {
170 return 0;
171 }
172
173 #ifdef CONFIG_X86_LOCAL_APIC
174
175
176
177
178
179 static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs)
180 {
181 static atomic_t nmi_cpu = ATOMIC_INIT(-1);
182
183 if (!unknown_nmi_panic)
184 return NMI_DONE;
185
186 if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1)
187 return NMI_HANDLED;
188
189 return NMI_DONE;
190 }
191 #endif
192
193 static unsigned long hv_get_tsc_khz(void)
194 {
195 unsigned long freq;
196
197 rdmsrl(HV_X64_MSR_TSC_FREQUENCY, freq);
198
199 return freq / 1000;
200 }
201
202 #if defined(CONFIG_SMP) && IS_ENABLED(CONFIG_HYPERV)
203 static void __init hv_smp_prepare_boot_cpu(void)
204 {
205 native_smp_prepare_boot_cpu();
206 #if defined(CONFIG_X86_64) && defined(CONFIG_PARAVIRT_SPINLOCKS)
207 hv_init_spinlocks();
208 #endif
209 }
210 #endif
211
212 static void __init ms_hyperv_init_platform(void)
213 {
214 int hv_host_info_eax;
215 int hv_host_info_ebx;
216 int hv_host_info_ecx;
217 int hv_host_info_edx;
218
219 #ifdef CONFIG_PARAVIRT
220 pv_info.name = "Hyper-V";
221 #endif
222
223
224
225
226 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
227 ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
228 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
229
230 pr_info("Hyper-V: features 0x%x, hints 0x%x, misc 0x%x\n",
231 ms_hyperv.features, ms_hyperv.hints, ms_hyperv.misc_features);
232
233 ms_hyperv.max_vp_index = cpuid_eax(HYPERV_CPUID_IMPLEMENT_LIMITS);
234 ms_hyperv.max_lp_index = cpuid_ebx(HYPERV_CPUID_IMPLEMENT_LIMITS);
235
236 pr_debug("Hyper-V: max %u virtual processors, %u logical processors\n",
237 ms_hyperv.max_vp_index, ms_hyperv.max_lp_index);
238
239
240
241
242 if (cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS) >=
243 HYPERV_CPUID_VERSION) {
244 hv_host_info_eax = cpuid_eax(HYPERV_CPUID_VERSION);
245 hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION);
246 hv_host_info_ecx = cpuid_ecx(HYPERV_CPUID_VERSION);
247 hv_host_info_edx = cpuid_edx(HYPERV_CPUID_VERSION);
248
249 pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d\n",
250 hv_host_info_eax, hv_host_info_ebx >> 16,
251 hv_host_info_ebx & 0xFFFF, hv_host_info_ecx,
252 hv_host_info_edx >> 24, hv_host_info_edx & 0xFFFFFF);
253 }
254
255 if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS &&
256 ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) {
257 x86_platform.calibrate_tsc = hv_get_tsc_khz;
258 x86_platform.calibrate_cpu = hv_get_tsc_khz;
259 }
260
261 if (ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED) {
262 ms_hyperv.nested_features =
263 cpuid_eax(HYPERV_CPUID_NESTED_FEATURES);
264 }
265
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272
273 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE)
274 crash_kexec_post_notifiers = true;
275
276 #ifdef CONFIG_X86_LOCAL_APIC
277 if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS &&
278 ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) {
279
280
281
282 u64 hv_lapic_frequency;
283
284 rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency);
285 hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ);
286 lapic_timer_period = hv_lapic_frequency;
287 pr_info("Hyper-V: LAPIC Timer Frequency: %#x\n",
288 lapic_timer_period);
289 }
290
291 register_nmi_handler(NMI_UNKNOWN, hv_nmi_unknown, NMI_FLAG_FIRST,
292 "hv_nmi_unknown");
293 #endif
294
295 #ifdef CONFIG_X86_IO_APIC
296 no_timer_check = 1;
297 #endif
298
299 #if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE)
300 machine_ops.shutdown = hv_machine_shutdown;
301 machine_ops.crash_shutdown = hv_machine_crash_shutdown;
302 #endif
303 mark_tsc_unstable("running on Hyper-V");
304
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308
309 if (efi_enabled(EFI_BOOT))
310 x86_platform.get_nmi_reason = hv_get_nmi_reason;
311
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320 i8253_clear_counter_on_shutdown = false;
321
322 #if IS_ENABLED(CONFIG_HYPERV)
323
324
325
326 x86_platform.apic_post_init = hyperv_init;
327 hyperv_setup_mmu_ops();
328
329 alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
330
331
332 if (ms_hyperv.features & HV_X64_ACCESS_REENLIGHTENMENT)
333 alloc_intr_gate(HYPERV_REENLIGHTENMENT_VECTOR,
334 hyperv_reenlightenment_vector);
335
336
337 if (ms_hyperv.misc_features & HV_STIMER_DIRECT_MODE_AVAILABLE)
338 alloc_intr_gate(HYPERV_STIMER0_VECTOR,
339 hv_stimer0_callback_vector);
340
341 # ifdef CONFIG_SMP
342 smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;
343 # endif
344
345
346
347
348
349
350
351 # ifdef CONFIG_X86_X2APIC
352 if (x2apic_supported())
353 x2apic_phys = 1;
354 # endif
355
356
357 hv_init_clocksource();
358 #endif
359 }
360
361 void hv_setup_sched_clock(void *sched_clock)
362 {
363 #ifdef CONFIG_PARAVIRT
364 pv_ops.time.sched_clock = sched_clock;
365 #endif
366 }
367
368 const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
369 .name = "Microsoft Hyper-V",
370 .detect = ms_hyperv_platform,
371 .type = X86_HYPER_MS_HYPERV,
372 .init.init_platform = ms_hyperv_init_platform,
373 };