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13#include <linux/types.h>
14#include <linux/time.h>
15#include <linux/clocksource.h>
16#include <linux/init.h>
17#include <linux/export.h>
18#include <linux/hardirq.h>
19#include <linux/efi.h>
20#include <linux/interrupt.h>
21#include <linux/irq.h>
22#include <linux/kexec.h>
23#include <asm/processor.h>
24#include <asm/hypervisor.h>
25#include <asm/hyperv.h>
26#include <asm/mshyperv.h>
27#include <asm/desc.h>
28#include <asm/irq_regs.h>
29#include <asm/i8259.h>
30#include <asm/apic.h>
31#include <asm/timer.h>
32#include <asm/reboot.h>
33#include <asm/nmi.h>
34
35struct ms_hyperv_info ms_hyperv;
36EXPORT_SYMBOL_GPL(ms_hyperv);
37
38#if IS_ENABLED(CONFIG_HYPERV)
39static void (*vmbus_handler)(void);
40static void (*hv_kexec_handler)(void);
41static void (*hv_crash_handler)(struct pt_regs *regs);
42
43void 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 exiting_irq();
53 set_irq_regs(old_regs);
54}
55
56void hv_setup_vmbus_irq(void (*handler)(void))
57{
58 vmbus_handler = handler;
59
60
61
62
63 if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
64 alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
65 hyperv_callback_vector);
66}
67
68void hv_remove_vmbus_irq(void)
69{
70
71 vmbus_handler = NULL;
72}
73EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq);
74EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq);
75
76void hv_setup_kexec_handler(void (*handler)(void))
77{
78 hv_kexec_handler = handler;
79}
80EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);
81
82void hv_remove_kexec_handler(void)
83{
84 hv_kexec_handler = NULL;
85}
86EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);
87
88void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))
89{
90 hv_crash_handler = handler;
91}
92EXPORT_SYMBOL_GPL(hv_setup_crash_handler);
93
94void hv_remove_crash_handler(void)
95{
96 hv_crash_handler = NULL;
97}
98EXPORT_SYMBOL_GPL(hv_remove_crash_handler);
99
100#ifdef CONFIG_KEXEC_CORE
101static void hv_machine_shutdown(void)
102{
103 if (kexec_in_progress && hv_kexec_handler)
104 hv_kexec_handler();
105 native_machine_shutdown();
106}
107
108static 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}
114#endif
115#endif
116
117static uint32_t __init ms_hyperv_platform(void)
118{
119 u32 eax;
120 u32 hyp_signature[3];
121
122 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
123 return 0;
124
125 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
126 &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
127
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;
134}
135
136static unsigned char hv_get_nmi_reason(void)
137{
138 return 0;
139}
140
141#ifdef CONFIG_X86_LOCAL_APIC
142
143
144
145
146
147static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs)
148{
149 static atomic_t nmi_cpu = ATOMIC_INIT(-1);
150
151 if (!unknown_nmi_panic)
152 return NMI_DONE;
153
154 if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1)
155 return NMI_HANDLED;
156
157 return NMI_DONE;
158}
159#endif
160
161static void __init ms_hyperv_init_platform(void)
162{
163 int hv_host_info_eax;
164 int hv_host_info_ebx;
165 int hv_host_info_ecx;
166 int hv_host_info_edx;
167
168
169
170
171 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
172 ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
173 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
174
175 pr_info("HyperV: features 0x%x, hints 0x%x\n",
176 ms_hyperv.features, ms_hyperv.hints);
177
178
179
180
181 if (cpuid_eax(HVCPUID_VENDOR_MAXFUNCTION) >= HVCPUID_VERSION) {
182 hv_host_info_eax = cpuid_eax(HVCPUID_VERSION);
183 hv_host_info_ebx = cpuid_ebx(HVCPUID_VERSION);
184 hv_host_info_ecx = cpuid_ecx(HVCPUID_VERSION);
185 hv_host_info_edx = cpuid_edx(HVCPUID_VERSION);
186
187 pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d\n",
188 hv_host_info_eax, hv_host_info_ebx >> 16,
189 hv_host_info_ebx & 0xFFFF, hv_host_info_ecx,
190 hv_host_info_edx >> 24, hv_host_info_edx & 0xFFFFFF);
191 }
192
193#ifdef CONFIG_X86_LOCAL_APIC
194 if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) {
195
196
197
198 u64 hv_lapic_frequency;
199
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;
203 pr_info("HyperV: LAPIC Timer Frequency: %#x\n",
204 lapic_timer_frequency);
205 }
206
207 register_nmi_handler(NMI_UNKNOWN, hv_nmi_unknown, NMI_FLAG_FIRST,
208 "hv_nmi_unknown");
209#endif
210
211#ifdef CONFIG_X86_IO_APIC
212 no_timer_check = 1;
213#endif
214
215#if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE)
216 machine_ops.shutdown = hv_machine_shutdown;
217 machine_ops.crash_shutdown = hv_machine_crash_shutdown;
218#endif
219 mark_tsc_unstable("running on Hyper-V");
220
221
222
223
224
225 if (efi_enabled(EFI_BOOT))
226 x86_platform.get_nmi_reason = hv_get_nmi_reason;
227
228#if IS_ENABLED(CONFIG_HYPERV)
229
230
231
232 x86_platform.apic_post_init = hyperv_init;
233#endif
234}
235
236const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
237 .name = "Microsoft HyperV",
238 .detect = ms_hyperv_platform,
239 .init_platform = ms_hyperv_init_platform,
240};
241EXPORT_SYMBOL(x86_hyper_ms_hyperv);
242
