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Linux/arch/x86/kernel/cpu/mshyperv.c

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  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
  9  * the Free Software Foundation; version 2 of the License.
 10  *
 11  */
 12 
 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 
 35 struct ms_hyperv_info ms_hyperv;
 36 EXPORT_SYMBOL_GPL(ms_hyperv);
 37 
 38 #if IS_ENABLED(CONFIG_HYPERV)
 39 static void (*vmbus_handler)(void);
 40 static void (*hv_kexec_handler)(void);
 41 static void (*hv_crash_handler)(struct pt_regs *regs);
 42 
 43 void 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 
 56 void hv_setup_vmbus_irq(void (*handler)(void))
 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 
 68 void hv_remove_vmbus_irq(void)
 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);
 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);
 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);
 99 
100 #ifdef CONFIG_KEXEC_CORE
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 
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 }
114 #endif /* CONFIG_KEXEC_CORE */
115 #endif /* CONFIG_HYPERV */
116 
117 static 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 
136 static unsigned char hv_get_nmi_reason(void)
137 {
138         return 0;
139 }
140 
141 #ifdef CONFIG_X86_LOCAL_APIC
142 /*
143  * Prior to WS2016 Debug-VM sends NMIs to all CPUs which makes
144  * it dificult to process CHANNELMSG_UNLOAD in case of crash. Handle
145  * unknown NMI on the first CPU which gets it.
146  */
147 static 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 
161 static 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          * Extract the features and hints
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          * Extract host information.
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                  * Get the APIC frequency.
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          * Generation 2 instances don't support reading the NMI status from
223          * 0x61 port.
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          * Setup the hook to get control post apic initialization.
231          */
232         x86_platform.apic_post_init = hyperv_init;
233 #endif
234 }
235 
236 const __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 };
241 EXPORT_SYMBOL(x86_hyper_ms_hyperv);
242 

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