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 #include <asm/paravirt.h>
  12 #include <asm/mshyperv.h>
  13
  14 typedef int (*hyperv_fill_flush_list_func)(
  15                 struct hv_guest_mapping_flush_list *flush,
  16                 void *data);
  17
  18 static inline void hv_set_register(unsigned int reg, u64 value)
  19 {
  20         wrmsrl(reg, value);
  21 }
  22
  23 static inline u64 hv_get_register(unsigned int reg)
  24 {
  25         u64 value;
  26
  27         rdmsrl(reg, value);
  28         return value;
  29 }
  30
  31 #define hv_get_raw_timer() rdtsc_ordered()
  32
  33 void hyperv_vector_handler(struct pt_regs *regs);
  34
  35 #if IS_ENABLED(CONFIG_HYPERV)
  36 extern int hyperv_init_cpuhp;
  37
  38 extern void *hv_hypercall_pg;
  39
  40 extern u64 hv_current_partition_id;
  41
  42 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
  43 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
  44 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
  45
  46 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
  47 {
  48         u64 input_address = input ? virt_to_phys(input) : 0;
  49         u64 output_address = output ? virt_to_phys(output) : 0;
  50         u64 hv_status;
  51
  52 #ifdef CONFIG_X86_64
  53         if (!hv_hypercall_pg)
  54                 return U64_MAX;
  55
  56         __asm__ __volatile__("mov %4, %%r8\n"
  57                              CALL_NOSPEC
  58                              : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  59                                "+c" (control), "+d" (input_address)
  60                              :  "r" (output_address),
  61                                 THUNK_TARGET(hv_hypercall_pg)
  62                              : "cc", "memory", "r8", "r9", "r10", "r11");
  63 #else
  64         u32 input_address_hi = upper_32_bits(input_address);
  65         u32 input_address_lo = lower_32_bits(input_address);
  66         u32 output_address_hi = upper_32_bits(output_address);
  67         u32 output_address_lo = lower_32_bits(output_address);
  68
  69         if (!hv_hypercall_pg)
  70                 return U64_MAX;
  71
  72         __asm__ __volatile__(CALL_NOSPEC
  73                              : "=A" (hv_status),
  74                                "+c" (input_address_lo), ASM_CALL_CONSTRAINT
  75                              : "A" (control),
  76                                "b" (input_address_hi),
  77                                "D"(output_address_hi), "S"(output_address_lo),
  78                                THUNK_TARGET(hv_hypercall_pg)
  79                              : "cc", "memory");
  80 #endif /* !x86_64 */
  81         return hv_status;
  82 }
  83
  84 /* Fast hypercall with 8 bytes of input and no output */
  85 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
  86 {
  87         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
  88
  89 #ifdef CONFIG_X86_64
  90         {
  91                 __asm__ __volatile__(CALL_NOSPEC
  92                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  93                                        "+c" (control), "+d" (input1)
  94                                      : THUNK_TARGET(hv_hypercall_pg)
  95                                      : "cc", "r8", "r9", "r10", "r11");
  96         }
  97 #else
  98         {
  99                 u32 input1_hi = upper_32_bits(input1);
 100                 u32 input1_lo = lower_32_bits(input1);
 101
 102                 __asm__ __volatile__ (CALL_NOSPEC
 103                                       : "=A"(hv_status),
 104                                         "+c"(input1_lo),
 105                                         ASM_CALL_CONSTRAINT
 106                                       : "A" (control),
 107                                         "b" (input1_hi),
 108                                         THUNK_TARGET(hv_hypercall_pg)
 109                                       : "cc", "edi", "esi");
 110         }
 111 #endif
 112                 return hv_status;
 113 }
 114
 115 /* Fast hypercall with 16 bytes of input */
 116 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
 117 {
 118         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
 119
 120 #ifdef CONFIG_X86_64
 121         {
 122                 __asm__ __volatile__("mov %4, %%r8\n"
 123                                      CALL_NOSPEC
 124                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 125                                        "+c" (control), "+d" (input1)
 126                                      : "r" (input2),
 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                 u32 input2_hi = upper_32_bits(input2);
 135                 u32 input2_lo = lower_32_bits(input2);
 136
 137                 __asm__ __volatile__ (CALL_NOSPEC
 138                                       : "=A"(hv_status),
 139                                         "+c"(input1_lo), ASM_CALL_CONSTRAINT
 140                                       : "A" (control), "b" (input1_hi),
 141                                         "D"(input2_hi), "S"(input2_lo),
 142                                         THUNK_TARGET(hv_hypercall_pg)
 143                                       : "cc");
 144         }
 145 #endif
 146         return hv_status;
 147 }
 148
 149 extern struct hv_vp_assist_page **hv_vp_assist_page;
 150
 151 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 152 {
 153         if (!hv_vp_assist_page)
 154                 return NULL;
 155
 156         return hv_vp_assist_page[cpu];
 157 }
 158
 159 void __init hyperv_init(void);
 160 void hyperv_setup_mmu_ops(void);
 161 void set_hv_tscchange_cb(void (*cb)(void));
 162 void clear_hv_tscchange_cb(void);
 163 void hyperv_stop_tsc_emulation(void);
 164 int hyperv_flush_guest_mapping(u64 as);
 165 int hyperv_flush_guest_mapping_range(u64 as,
 166                 hyperv_fill_flush_list_func fill_func, void *data);
 167 int hyperv_fill_flush_guest_mapping_list(
 168                 struct hv_guest_mapping_flush_list *flush,
 169                 u64 start_gfn, u64 end_gfn);
 170
 171 #ifdef CONFIG_X86_64
 172 void hv_apic_init(void);
 173 void __init hv_init_spinlocks(void);
 174 bool hv_vcpu_is_preempted(int vcpu);
 175 #else
 176 static inline void hv_apic_init(void) {}
 177 #endif
 178
 179 struct irq_domain *hv_create_pci_msi_domain(void);
 180
 181 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
 182                 struct hv_interrupt_entry *entry);
 183 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
 184
 185 #else /* CONFIG_HYPERV */
 186 static inline void hyperv_init(void) {}
 187 static inline void hyperv_setup_mmu_ops(void) {}
 188 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
 189 static inline void clear_hv_tscchange_cb(void) {}
 190 static inline void hyperv_stop_tsc_emulation(void) {};
 191 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 192 {
 193         return NULL;
 194 }
 195 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
 196 static inline int hyperv_flush_guest_mapping_range(u64 as,
 197                 hyperv_fill_flush_list_func fill_func, void *data)
 198 {
 199         return -1;
 200 }
 201 #endif /* CONFIG_HYPERV */
 202
 203
 204 #include <asm-generic/mshyperv.h>
 205
 206 #endif