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 #define hv_recommend_using_aeoi() \
  39         (!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED))
  40
  41 #define hv_get_crash_ctl(val) \
  42         rdmsrl(HV_X64_MSR_CRASH_CTL, val)
  43
  44 #define hv_get_time_ref_count(val) \
  45         rdmsrl(HV_X64_MSR_TIME_REF_COUNT, val)
  46
  47 #define hv_get_reference_tsc(val) \
  48         rdmsrl(HV_X64_MSR_REFERENCE_TSC, val)
  49 #define hv_set_reference_tsc(val) \
  50         wrmsrl(HV_X64_MSR_REFERENCE_TSC, val)
  51 #define hv_set_clocksource_vdso(val) \
  52         ((val).vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK)
  53 #define hv_enable_vdso_clocksource() \
  54         vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
  55 #define hv_get_raw_timer() rdtsc_ordered()
  56
  57 void hyperv_callback_vector(void);
  58 void hyperv_reenlightenment_vector(void);
  59 #ifdef CONFIG_TRACING
  60 #define trace_hyperv_callback_vector hyperv_callback_vector
  61 #endif
  62 void hyperv_vector_handler(struct pt_regs *regs);
  63
  64 /*
  65  * Routines for stimer0 Direct Mode handling.
  66  * On x86/x64, there are no percpu actions to take.
  67  */
  68 void hv_stimer0_vector_handler(struct pt_regs *regs);
  69 void hv_stimer0_callback_vector(void);
  70
  71 static inline void hv_enable_stimer0_percpu_irq(int irq) {}
  72 static inline void hv_disable_stimer0_percpu_irq(int irq) {}
  73
  74
  75 #if IS_ENABLED(CONFIG_HYPERV)
  76 extern void *hv_hypercall_pg;
  77 extern void  __percpu  **hyperv_pcpu_input_arg;
  78
  79 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
  80 {
  81         u64 input_address = input ? virt_to_phys(input) : 0;
  82         u64 output_address = output ? virt_to_phys(output) : 0;
  83         u64 hv_status;
  84
  85 #ifdef CONFIG_X86_64
  86         if (!hv_hypercall_pg)
  87                 return U64_MAX;
  88
  89         __asm__ __volatile__("mov %4, %%r8\n"
  90                              CALL_NOSPEC
  91                              : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  92                                "+c" (control), "+d" (input_address)
  93                              :  "r" (output_address),
  94                                 THUNK_TARGET(hv_hypercall_pg)
  95                              : "cc", "memory", "r8", "r9", "r10", "r11");
  96 #else
  97         u32 input_address_hi = upper_32_bits(input_address);
  98         u32 input_address_lo = lower_32_bits(input_address);
  99         u32 output_address_hi = upper_32_bits(output_address);
 100         u32 output_address_lo = lower_32_bits(output_address);
 101
 102         if (!hv_hypercall_pg)
 103                 return U64_MAX;
 104
 105         __asm__ __volatile__(CALL_NOSPEC
 106                              : "=A" (hv_status),
 107                                "+c" (input_address_lo), ASM_CALL_CONSTRAINT
 108                              : "A" (control),
 109                                "b" (input_address_hi),
 110                                "D"(output_address_hi), "S"(output_address_lo),
 111                                THUNK_TARGET(hv_hypercall_pg)
 112                              : "cc", "memory");
 113 #endif /* !x86_64 */
 114         return hv_status;
 115 }
 116
 117 /* Fast hypercall with 8 bytes of input and no output */
 118 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
 119 {
 120         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
 121
 122 #ifdef CONFIG_X86_64
 123         {
 124                 __asm__ __volatile__(CALL_NOSPEC
 125                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 126                                        "+c" (control), "+d" (input1)
 127                                      : THUNK_TARGET(hv_hypercall_pg)
 128                                      : "cc", "r8", "r9", "r10", "r11");
 129         }
 130 #else
 131         {
 132                 u32 input1_hi = upper_32_bits(input1);
 133                 u32 input1_lo = lower_32_bits(input1);
 134
 135                 __asm__ __volatile__ (CALL_NOSPEC
 136                                       : "=A"(hv_status),
 137                                         "+c"(input1_lo),
 138                                         ASM_CALL_CONSTRAINT
 139                                       : "A" (control),
 140                                         "b" (input1_hi),
 141                                         THUNK_TARGET(hv_hypercall_pg)
 142                                       : "cc", "edi", "esi");
 143         }
 144 #endif
 145                 return hv_status;
 146 }
 147
 148 /* Fast hypercall with 16 bytes of input */
 149 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
 150 {
 151         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
 152
 153 #ifdef CONFIG_X86_64
 154         {
 155                 __asm__ __volatile__("mov %4, %%r8\n"
 156                                      CALL_NOSPEC
 157                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 158                                        "+c" (control), "+d" (input1)
 159                                      : "r" (input2),
 160                                        THUNK_TARGET(hv_hypercall_pg)
 161                                      : "cc", "r8", "r9", "r10", "r11");
 162         }
 163 #else
 164         {
 165                 u32 input1_hi = upper_32_bits(input1);
 166                 u32 input1_lo = lower_32_bits(input1);
 167                 u32 input2_hi = upper_32_bits(input2);
 168                 u32 input2_lo = lower_32_bits(input2);
 169
 170                 __asm__ __volatile__ (CALL_NOSPEC
 171                                       : "=A"(hv_status),
 172                                         "+c"(input1_lo), ASM_CALL_CONSTRAINT
 173                                       : "A" (control), "b" (input1_hi),
 174                                         "D"(input2_hi), "S"(input2_lo),
 175                                         THUNK_TARGET(hv_hypercall_pg)
 176                                       : "cc");
 177         }
 178 #endif
 179         return hv_status;
 180 }
 181
 182 /*
 183  * Rep hypercalls. Callers of this functions are supposed to ensure that
 184  * rep_count and varhead_size comply with Hyper-V hypercall definition.
 185  */
 186 static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
 187                                       void *input, void *output)
 188 {
 189         u64 control = code;
 190         u64 status;
 191         u16 rep_comp;
 192
 193         control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
 194         control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
 195
 196         do {
 197                 status = hv_do_hypercall(control, input, output);
 198                 if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
 199                         return status;
 200
 201                 /* Bits 32-43 of status have 'Reps completed' data. */
 202                 rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
 203                         HV_HYPERCALL_REP_COMP_OFFSET;
 204
 205                 control &= ~HV_HYPERCALL_REP_START_MASK;
 206                 control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
 207
 208                 touch_nmi_watchdog();
 209         } while (rep_comp < rep_count);
 210
 211         return status;
 212 }
 213
 214 extern struct hv_vp_assist_page **hv_vp_assist_page;
 215
 216 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 217 {
 218         if (!hv_vp_assist_page)
 219                 return NULL;
 220
 221         return hv_vp_assist_page[cpu];
 222 }
 223
 224 void __init hyperv_init(void);
 225 void hyperv_setup_mmu_ops(void);
 226 void *hv_alloc_hyperv_page(void);
 227 void *hv_alloc_hyperv_zeroed_page(void);
 228 void hv_free_hyperv_page(unsigned long addr);
 229 void hyperv_reenlightenment_intr(struct pt_regs *regs);
 230 void set_hv_tscchange_cb(void (*cb)(void));
 231 void clear_hv_tscchange_cb(void);
 232 void hyperv_stop_tsc_emulation(void);
 233 int hyperv_flush_guest_mapping(u64 as);
 234 int hyperv_flush_guest_mapping_range(u64 as,
 235                 hyperv_fill_flush_list_func fill_func, void *data);
 236 int hyperv_fill_flush_guest_mapping_list(
 237                 struct hv_guest_mapping_flush_list *flush,
 238                 u64 start_gfn, u64 end_gfn);
 239
 240 #ifdef CONFIG_X86_64
 241 void hv_apic_init(void);
 242 void __init hv_init_spinlocks(void);
 243 bool hv_vcpu_is_preempted(int vcpu);
 244 #else
 245 static inline void hv_apic_init(void) {}
 246 #endif
 247
 248 static inline void hv_set_msi_entry_from_desc(union hv_msi_entry *msi_entry,
 249                                               struct msi_desc *msi_desc)
 250 {
 251         msi_entry->address = msi_desc->msg.address_lo;
 252         msi_entry->data = msi_desc->msg.data;
 253 }
 254
 255 #else /* CONFIG_HYPERV */
 256 static inline void hyperv_init(void) {}
 257 static inline void hyperv_setup_mmu_ops(void) {}
 258 static inline void *hv_alloc_hyperv_page(void) { return NULL; }
 259 static inline void hv_free_hyperv_page(unsigned long addr) {}
 260 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
 261 static inline void clear_hv_tscchange_cb(void) {}
 262 static inline void hyperv_stop_tsc_emulation(void) {};
 263 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 264 {
 265         return NULL;
 266 }
 267 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
 268 static inline int hyperv_flush_guest_mapping_range(u64 as,
 269                 hyperv_fill_flush_list_func fill_func, void *data)
 270 {
 271         return -1;
 272 }
 273 #endif /* CONFIG_HYPERV */
 274
 275
 276 #include <asm-generic/mshyperv.h>
 277
 278 #endif