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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/module.h>
 17 #include <linux/hardirq.h>
 18 #include <linux/interrupt.h>
 19 #include <asm/processor.h>
 20 #include <asm/hypervisor.h>
 21 #include <asm/hyperv.h>
 22 #include <asm/mshyperv.h>
 23 #include <asm/desc.h>
 24 #include <asm/idle.h>
 25 #include <asm/irq_regs.h>
 26 
 27 struct ms_hyperv_info ms_hyperv;
 28 EXPORT_SYMBOL_GPL(ms_hyperv);
 29 
 30 static bool __init ms_hyperv_platform(void)
 31 {
 32         u32 eax;
 33         u32 hyp_signature[3];
 34 
 35         if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
 36                 return false;
 37 
 38         cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
 39               &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
 40 
 41         return eax >= HYPERV_CPUID_MIN &&
 42                 eax <= HYPERV_CPUID_MAX &&
 43                 !memcmp("Microsoft Hv", hyp_signature, 12);
 44 }
 45 
 46 static cycle_t read_hv_clock(struct clocksource *arg)
 47 {
 48         cycle_t current_tick;
 49         /*
 50          * Read the partition counter to get the current tick count. This count
 51          * is set to 0 when the partition is created and is incremented in
 52          * 100 nanosecond units.
 53          */
 54         rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
 55         return current_tick;
 56 }
 57 
 58 static struct clocksource hyperv_cs = {
 59         .name           = "hyperv_clocksource",
 60         .rating         = 400, /* use this when running on Hyperv*/
 61         .read           = read_hv_clock,
 62         .mask           = CLOCKSOURCE_MASK(64),
 63         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 64 };
 65 
 66 static void __init ms_hyperv_init_platform(void)
 67 {
 68         /*
 69          * Extract the features and hints
 70          */
 71         ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
 72         ms_hyperv.hints    = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
 73 
 74         printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
 75                ms_hyperv.features, ms_hyperv.hints);
 76 
 77         if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)
 78                 clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100);
 79 }
 80 
 81 const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
 82         .name                   = "Microsoft HyperV",
 83         .detect                 = ms_hyperv_platform,
 84         .init_platform          = ms_hyperv_init_platform,
 85 };
 86 EXPORT_SYMBOL(x86_hyper_ms_hyperv);
 87 
 88 #if IS_ENABLED(CONFIG_HYPERV)
 89 static int vmbus_irq = -1;
 90 static irq_handler_t vmbus_isr;
 91 
 92 void hv_register_vmbus_handler(int irq, irq_handler_t handler)
 93 {
 94         /*
 95          * Setup the IDT for hypervisor callback.
 96          */
 97         alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
 98 
 99         vmbus_irq = irq;
100         vmbus_isr = handler;
101 }
102 
103 void hyperv_vector_handler(struct pt_regs *regs)
104 {
105         struct pt_regs *old_regs = set_irq_regs(regs);
106         struct irq_desc *desc;
107 
108         irq_enter();
109         exit_idle();
110 
111         desc = irq_to_desc(vmbus_irq);
112 
113         if (desc)
114                 generic_handle_irq_desc(vmbus_irq, desc);
115 
116         irq_exit();
117         set_irq_regs(old_regs);
118 }
119 #else
120 void hv_register_vmbus_handler(int irq, irq_handler_t handler)
121 {
122 }
123 #endif
124 EXPORT_SYMBOL_GPL(hv_register_vmbus_handler);
125 

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