arch/x86/include/asm/mshyperv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_MSHYPER_H
   3 #define _ASM_X86_MSHYPER_H
   4
   5 #include <linux/types.h>
   6 #include <linux/nmi.h>
   7 #include <linux/msi.h>
   8 #include <asm/io.h>
   9 #include <asm/hyperv-tlfs.h>
  10 #include <asm/nospec-branch.h>
  11
  12 typedef int (*hyperv_fill_flush_list_func)(
  13                 struct hv_guest_mapping_flush_list *flush,
  14                 void *data);
  15
  16 #define hv_init_timer(timer, tick) \
  17         wrmsrl(HV_X64_MSR_STIMER0_COUNT + (2*timer), tick)
  18 #define hv_init_timer_config(timer, val) \
  19         wrmsrl(HV_X64_MSR_STIMER0_CONFIG + (2*timer), val)
  20
  21 #define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
  22 #define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
  23
  24 #define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
  25 #define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
  26
  27 #define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
  28 #define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
  29
  30 #define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
  31
  32 #define hv_signal_eom() wrmsrl(HV_X64_MSR_EOM, 0)
  33
  34 #define hv_get_synint_state(int_num, val) \
  35         rdmsrl(HV_X64_MSR_SINT0 + int_num, val)
  36 #define hv_set_synint_state(int_num, val) \
  37         wrmsrl(HV_X64_MSR_SINT0 + int_num, val)
  38
  39 #define hv_get_crash_ctl(val) \
  40         rdmsrl(HV_X64_MSR_CRASH_CTL, val)
  41
  42 #define hv_get_time_ref_count(val) \
  43         rdmsrl(HV_X64_MSR_TIME_REF_COUNT, val)
  44
  45 #define hv_get_reference_tsc(val) \
  46         rdmsrl(HV_X64_MSR_REFERENCE_TSC, val)
  47 #define hv_set_reference_tsc(val) \
  48         wrmsrl(HV_X64_MSR_REFERENCE_TSC, val)
  49 #define hv_set_clocksource_vdso(val) \
  50         ((val).vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK)
  51 #define hv_enable_vdso_clocksource() \
  52         vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
  53 #define hv_get_raw_timer() rdtsc_ordered()
  54
  55 void hyperv_callback_vector(void);
  56 void hyperv_reenlightenment_vector(void);
  57 #ifdef CONFIG_TRACING
  58 #define trace_hyperv_callback_vector hyperv_callback_vector
  59 #endif
  60 void hyperv_vector_handler(struct pt_regs *regs);
  61
  62 /*
  63  * Routines for stimer0 Direct Mode handling.
  64  * On x86/x64, there are no percpu actions to take.
  65  */
  66 void hv_stimer0_vector_handler(struct pt_regs *regs);
  67 void hv_stimer0_callback_vector(void);
  68
  69 static inline void hv_enable_stimer0_percpu_irq(int irq) {}
  70 static inline void hv_disable_stimer0_percpu_irq(int irq) {}
  71
  72
  73 #if IS_ENABLED(CONFIG_HYPERV)
  74 extern void *hv_hypercall_pg;
  75 extern void  __percpu  **hyperv_pcpu_input_arg;
  76
  77 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
  78 {
  79         u64 input_address = input ? virt_to_phys(input) : 0;
  80         u64 output_address = output ? virt_to_phys(output) : 0;
  81         u64 hv_status;
  82
  83 #ifdef CONFIG_X86_64
  84         if (!hv_hypercall_pg)
  85                 return U64_MAX;
  86
  87         __asm__ __volatile__("mov %4, %%r8\n"
  88                              CALL_NOSPEC
  89                              : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  90                                "+c" (control), "+d" (input_address)
  91                              :  "r" (output_address),
  92                                 THUNK_TARGET(hv_hypercall_pg)
  93                              : "cc", "memory", "r8", "r9", "r10", "r11");
  94 #else
  95         u32 input_address_hi = upper_32_bits(input_address);
  96         u32 input_address_lo = lower_32_bits(input_address);
  97         u32 output_address_hi = upper_32_bits(output_address);
  98         u32 output_address_lo = lower_32_bits(output_address);
  99
 100         if (!hv_hypercall_pg)
 101                 return U64_MAX;
 102
 103         __asm__ __volatile__(CALL_NOSPEC
 104                              : "=A" (hv_status),
 105                                "+c" (input_address_lo), ASM_CALL_CONSTRAINT
 106                              : "A" (control),
 107                                "b" (input_address_hi),
 108                                "D"(output_address_hi), "S"(output_address_lo),
 109                                THUNK_TARGET(hv_hypercall_pg)
 110                              : "cc", "memory");
 111 #endif /* !x86_64 */
 112         return hv_status;
 113 }
 114
 115 /* Fast hypercall with 8 bytes of input and no output */
 116 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
 117 {
 118         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
 119
 120 #ifdef CONFIG_X86_64
 121         {
 122                 __asm__ __volatile__(CALL_NOSPEC
 123                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 124                                        "+c" (control), "+d" (input1)
 125                                      : THUNK_TARGET(hv_hypercall_pg)
 126                                      : "cc", "r8", "r9", "r10", "r11");
 127         }
 128 #else
 129         {
 130                 u32 input1_hi = upper_32_bits(input1);
 131                 u32 input1_lo = lower_32_bits(input1);
 132
 133                 __asm__ __volatile__ (CALL_NOSPEC
 134                                       : "=A"(hv_status),
 135                                         "+c"(input1_lo),
 136                                         ASM_CALL_CONSTRAINT
 137                                       : "A" (control),
 138                                         "b" (input1_hi),
 139                                         THUNK_TARGET(hv_hypercall_pg)
 140                                       : "cc", "edi", "esi");
 141         }
 142 #endif
 143                 return hv_status;
 144 }
 145
 146 /* Fast hypercall with 16 bytes of input */
 147 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
 148 {
 149         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
 150
 151 #ifdef CONFIG_X86_64
 152         {
 153                 __asm__ __volatile__("mov %4, %%r8\n"
 154                                      CALL_NOSPEC
 155                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 156                                        "+c" (control), "+d" (input1)
 157                                      : "r" (input2),
 158                                        THUNK_TARGET(hv_hypercall_pg)
 159                                      : "cc", "r8", "r9", "r10", "r11");
 160         }
 161 #else
 162         {
 163                 u32 input1_hi = upper_32_bits(input1);
 164                 u32 input1_lo = lower_32_bits(input1);
 165                 u32 input2_hi = upper_32_bits(input2);
 166                 u32 input2_lo = lower_32_bits(input2);
 167
 168                 __asm__ __volatile__ (CALL_NOSPEC
 169                                       : "=A"(hv_status),
 170                                         "+c"(input1_lo), ASM_CALL_CONSTRAINT
 171                                       : "A" (control), "b" (input1_hi),
 172                                         "D"(input2_hi), "S"(input2_lo),
 173                                         THUNK_TARGET(hv_hypercall_pg)
 174                                       : "cc");
 175         }
 176 #endif
 177         return hv_status;
 178 }
 179
 180 /*
 181  * Rep hypercalls. Callers of this functions are supposed to ensure that
 182  * rep_count and varhead_size comply with Hyper-V hypercall definition.
 183  */
 184 static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
 185                                       void *input, void *output)
 186 {
 187         u64 control = code;
 188         u64 status;
 189         u16 rep_comp;
 190
 191         control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
 192         control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
 193
 194         do {
 195                 status = hv_do_hypercall(control, input, output);
 196                 if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
 197                         return status;
 198
 199                 /* Bits 32-43 of status have 'Reps completed' data. */
 200                 rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
 201                         HV_HYPERCALL_REP_COMP_OFFSET;
 202
 203                 control &= ~HV_HYPERCALL_REP_START_MASK;
 204                 control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
 205
 206                 touch_nmi_watchdog();
 207         } while (rep_comp < rep_count);
 208
 209         return status;
 210 }
 211
 212 extern struct hv_vp_assist_page **hv_vp_assist_page;
 213
 214 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 215 {
 216         if (!hv_vp_assist_page)
 217                 return NULL;
 218
 219         return hv_vp_assist_page[cpu];
 220 }
 221
 222 void __init hyperv_init(void);
 223 void hyperv_setup_mmu_ops(void);
 224 void *hv_alloc_hyperv_page(void);
 225 void *hv_alloc_hyperv_zeroed_page(void);
 226 void hv_free_hyperv_page(unsigned long addr);
 227 void hyperv_reenlightenment_intr(struct pt_regs *regs);
 228 void set_hv_tscchange_cb(void (*cb)(void));
 229 void clear_hv_tscchange_cb(void);
 230 void hyperv_stop_tsc_emulation(void);
 231 int hyperv_flush_guest_mapping(u64 as);
 232 int hyperv_flush_guest_mapping_range(u64 as,
 233                 hyperv_fill_flush_list_func fill_func, void *data);
 234 int hyperv_fill_flush_guest_mapping_list(
 235                 struct hv_guest_mapping_flush_list *flush,
 236                 u64 start_gfn, u64 end_gfn);
 237
 238 #ifdef CONFIG_X86_64
 239 void hv_apic_init(void);
 240 void __init hv_init_spinlocks(void);
 241 bool hv_vcpu_is_preempted(int vcpu);
 242 #else
 243 static inline void hv_apic_init(void) {}
 244 #endif
 245
 246 static inline void hv_set_msi_entry_from_desc(union hv_msi_entry *msi_entry,
 247                                               struct msi_desc *msi_desc)
 248 {
 249         msi_entry->address = msi_desc->msg.address_lo;
 250         msi_entry->data = msi_desc->msg.data;
 251 }
 252
 253 #else /* CONFIG_HYPERV */
 254 static inline void hyperv_init(void) {}
 255 static inline void hyperv_setup_mmu_ops(void) {}
 256 static inline void *hv_alloc_hyperv_page(void) { return NULL; }
 257 static inline void hv_free_hyperv_page(unsigned long addr) {}
 258 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
 259 static inline void clear_hv_tscchange_cb(void) {}
 260 static inline void hyperv_stop_tsc_emulation(void) {};
 261 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 262 {
 263         return NULL;
 264 }
 265 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
 266 static inline int hyperv_flush_guest_mapping_range(u64 as,
 267                 hyperv_fill_flush_list_func fill_func, void *data)
 268 {
 269         return -1;
 270 }
 271 #endif /* CONFIG_HYPERV */
 272
 273
 274 #include <asm-generic/mshyperv.h>
 275
 276 #endif