arch/x86/include/asm/mshyperv.h

   1 #ifndef _ASM_X86_MSHYPER_H
   2 #define _ASM_X86_MSHYPER_H
   3
   4 #include <linux/types.h>
   5 #include <linux/interrupt.h>
   6 #include <asm/hyperv.h>
   7
   8 /*
   9  * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
  10  * is set by CPUID(HVCPUID_VERSION_FEATURES).
  11  */
  12 enum hv_cpuid_function {
  13         HVCPUID_VERSION_FEATURES                = 0x00000001,
  14         HVCPUID_VENDOR_MAXFUNCTION              = 0x40000000,
  15         HVCPUID_INTERFACE                       = 0x40000001,
  16
  17         /*
  18          * The remaining functions depend on the value of
  19          * HVCPUID_INTERFACE
  20          */
  21         HVCPUID_VERSION                         = 0x40000002,
  22         HVCPUID_FEATURES                        = 0x40000003,
  23         HVCPUID_ENLIGHTENMENT_INFO              = 0x40000004,
  24         HVCPUID_IMPLEMENTATION_LIMITS           = 0x40000005,
  25 };
  26
  27 struct ms_hyperv_info {
  28         u32 features;
  29         u32 misc_features;
  30         u32 hints;
  31 };
  32
  33 extern struct ms_hyperv_info ms_hyperv;
  34
  35 /*
  36  * Declare the MSR used to setup pages used to communicate with the hypervisor.
  37  */
  38 union hv_x64_msr_hypercall_contents {
  39         u64 as_uint64;
  40         struct {
  41                 u64 enable:1;
  42                 u64 reserved:11;
  43                 u64 guest_physical_address:52;
  44         };
  45 };
  46
  47 /*
  48  * TSC page layout.
  49  */
  50
  51 struct ms_hyperv_tsc_page {
  52         volatile u32 tsc_sequence;
  53         u32 reserved1;
  54         volatile u64 tsc_scale;
  55         volatile s64 tsc_offset;
  56         u64 reserved2[509];
  57 };
  58
  59 /*
  60  * The guest OS needs to register the guest ID with the hypervisor.
  61  * The guest ID is a 64 bit entity and the structure of this ID is
  62  * specified in the Hyper-V specification:
  63  *
  64  * msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
  65  *
  66  * While the current guideline does not specify how Linux guest ID(s)
  67  * need to be generated, our plan is to publish the guidelines for
  68  * Linux and other guest operating systems that currently are hosted
  69  * on Hyper-V. The implementation here conforms to this yet
  70  * unpublished guidelines.
  71  *
  72  *
  73  * Bit(s)
  74  * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
  75  * 62:56 - Os Type; Linux is 0x100
  76  * 55:48 - Distro specific identification
  77  * 47:16 - Linux kernel version number
  78  * 15:0  - Distro specific identification
  79  *
  80  *
  81  */
  82
  83 #define HV_LINUX_VENDOR_ID              0x8800
  84
  85 /*
  86  * Generate the guest ID based on the guideline described above.
  87  */
  88
  89 static inline  __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
  90                                        __u64 d_info2)
  91 {
  92         __u64 guest_id = 0;
  93
  94         guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 56);
  95         guest_id |= (d_info1 << 48);
  96         guest_id |= (kernel_version << 16);
  97         guest_id |= d_info2;
  98
  99         return guest_id;
 100 }
 101
 102 void hyperv_callback_vector(void);
 103 #ifdef CONFIG_TRACING
 104 #define trace_hyperv_callback_vector hyperv_callback_vector
 105 #endif
 106 void hyperv_vector_handler(struct pt_regs *regs);
 107 void hv_setup_vmbus_irq(void (*handler)(void));
 108 void hv_remove_vmbus_irq(void);
 109
 110 void hv_setup_kexec_handler(void (*handler)(void));
 111 void hv_remove_kexec_handler(void);
 112 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
 113 void hv_remove_crash_handler(void);
 114
 115 #if IS_ENABLED(CONFIG_HYPERV)
 116 void hyperv_init(void);
 117 void hyperv_report_panic(struct pt_regs *regs);
 118 #endif
 119 #endif