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 union hv_ghcb; 15 16 DECLARE_STATIC_KEY_FALSE(isolation_type_snp); 17 18 typedef int (*hyperv_fill_flush_list_func)( 19 struct hv_guest_mapping_flush_list *flush, 20 void *data); 21 22 void hyperv_vector_handler(struct pt_regs *regs); 23 24 #if IS_ENABLED(CONFIG_HYPERV) 25 extern int hyperv_init_cpuhp; 26 27 extern void *hv_hypercall_pg; 28 29 extern u64 hv_current_partition_id; 30 31 extern union hv_ghcb * __percpu *hv_ghcb_pg; 32 33 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 34 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 35 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 36 37 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 38 { 39 u64 input_address = input ? virt_to_phys(input) : 0; 40 u64 output_address = output ? virt_to_phys(output) : 0; 41 u64 hv_status; 42 43 #ifdef CONFIG_X86_64 44 if (!hv_hypercall_pg) 45 return U64_MAX; 46 47 __asm__ __volatile__("mov %4, %%r8\n" 48 CALL_NOSPEC 49 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 50 "+c" (control), "+d" (input_address) 51 : "r" (output_address), 52 THUNK_TARGET(hv_hypercall_pg) 53 : "cc", "memory", "r8", "r9", "r10", "r11"); 54 #else 55 u32 input_address_hi = upper_32_bits(input_address); 56 u32 input_address_lo = lower_32_bits(input_address); 57 u32 output_address_hi = upper_32_bits(output_address); 58 u32 output_address_lo = lower_32_bits(output_address); 59 60 if (!hv_hypercall_pg) 61 return U64_MAX; 62 63 __asm__ __volatile__(CALL_NOSPEC 64 : "=A" (hv_status), 65 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 66 : "A" (control), 67 "b" (input_address_hi), 68 "D"(output_address_hi), "S"(output_address_lo), 69 THUNK_TARGET(hv_hypercall_pg) 70 : "cc", "memory"); 71 #endif /* !x86_64 */ 72 return hv_status; 73 } 74 75 /* Hypercall to the L0 hypervisor */ 76 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) 77 { 78 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); 79 } 80 81 /* Fast hypercall with 8 bytes of input and no output */ 82 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 83 { 84 u64 hv_status; 85 86 #ifdef CONFIG_X86_64 87 { 88 __asm__ __volatile__(CALL_NOSPEC 89 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 90 "+c" (control), "+d" (input1) 91 : THUNK_TARGET(hv_hypercall_pg) 92 : "cc", "r8", "r9", "r10", "r11"); 93 } 94 #else 95 { 96 u32 input1_hi = upper_32_bits(input1); 97 u32 input1_lo = lower_32_bits(input1); 98 99 __asm__ __volatile__ (CALL_NOSPEC 100 : "=A"(hv_status), 101 "+c"(input1_lo), 102 ASM_CALL_CONSTRAINT 103 : "A" (control), 104 "b" (input1_hi), 105 THUNK_TARGET(hv_hypercall_pg) 106 : "cc", "edi", "esi"); 107 } 108 #endif 109 return hv_status; 110 } 111 112 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 113 { 114 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 115 116 return _hv_do_fast_hypercall8(control, input1); 117 } 118 119 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) 120 { 121 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 122 123 return _hv_do_fast_hypercall8(control, input1); 124 } 125 126 /* Fast hypercall with 16 bytes of input */ 127 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 128 { 129 u64 hv_status; 130 131 #ifdef CONFIG_X86_64 132 { 133 __asm__ __volatile__("mov %4, %%r8\n" 134 CALL_NOSPEC 135 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 136 "+c" (control), "+d" (input1) 137 : "r" (input2), 138 THUNK_TARGET(hv_hypercall_pg) 139 : "cc", "r8", "r9", "r10", "r11"); 140 } 141 #else 142 { 143 u32 input1_hi = upper_32_bits(input1); 144 u32 input1_lo = lower_32_bits(input1); 145 u32 input2_hi = upper_32_bits(input2); 146 u32 input2_lo = lower_32_bits(input2); 147 148 __asm__ __volatile__ (CALL_NOSPEC 149 : "=A"(hv_status), 150 "+c"(input1_lo), ASM_CALL_CONSTRAINT 151 : "A" (control), "b" (input1_hi), 152 "D"(input2_hi), "S"(input2_lo), 153 THUNK_TARGET(hv_hypercall_pg) 154 : "cc"); 155 } 156 #endif 157 return hv_status; 158 } 159 160 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 161 { 162 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 163 164 return _hv_do_fast_hypercall16(control, input1, input2); 165 } 166 167 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) 168 { 169 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 170 171 return _hv_do_fast_hypercall16(control, input1, input2); 172 } 173 174 extern struct hv_vp_assist_page **hv_vp_assist_page; 175 176 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 177 { 178 if (!hv_vp_assist_page) 179 return NULL; 180 181 return hv_vp_assist_page[cpu]; 182 } 183 184 void __init hyperv_init(void); 185 void hyperv_setup_mmu_ops(void); 186 void set_hv_tscchange_cb(void (*cb)(void)); 187 void clear_hv_tscchange_cb(void); 188 void hyperv_stop_tsc_emulation(void); 189 int hyperv_flush_guest_mapping(u64 as); 190 int hyperv_flush_guest_mapping_range(u64 as, 191 hyperv_fill_flush_list_func fill_func, void *data); 192 int hyperv_fill_flush_guest_mapping_list( 193 struct hv_guest_mapping_flush_list *flush, 194 u64 start_gfn, u64 end_gfn); 195 196 #ifdef CONFIG_X86_64 197 void hv_apic_init(void); 198 void __init hv_init_spinlocks(void); 199 bool hv_vcpu_is_preempted(int vcpu); 200 #else 201 static inline void hv_apic_init(void) {} 202 #endif 203 204 struct irq_domain *hv_create_pci_msi_domain(void); 205 206 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 207 struct hv_interrupt_entry *entry); 208 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 209 int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible); 210 211 #ifdef CONFIG_AMD_MEM_ENCRYPT 212 void hv_ghcb_msr_write(u64 msr, u64 value); 213 void hv_ghcb_msr_read(u64 msr, u64 *value); 214 bool hv_ghcb_negotiate_protocol(void); 215 void hv_ghcb_terminate(unsigned int set, unsigned int reason); 216 #else 217 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} 218 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} 219 static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 220 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 221 #endif 222 223 extern bool hv_isolation_type_snp(void); 224 225 static inline bool hv_is_synic_reg(unsigned int reg) 226 { 227 return (reg >= HV_REGISTER_SCONTROL) && 228 (reg <= HV_REGISTER_SINT15); 229 } 230 231 static inline bool hv_is_sint_reg(unsigned int reg) 232 { 233 return (reg >= HV_REGISTER_SINT0) && 234 (reg <= HV_REGISTER_SINT15); 235 } 236 237 u64 hv_get_register(unsigned int reg); 238 void hv_set_register(unsigned int reg, u64 value); 239 u64 hv_get_non_nested_register(unsigned int reg); 240 void hv_set_non_nested_register(unsigned int reg, u64 value); 241 242 #else /* CONFIG_HYPERV */ 243 static inline void hyperv_init(void) {} 244 static inline void hyperv_setup_mmu_ops(void) {} 245 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 246 static inline void clear_hv_tscchange_cb(void) {} 247 static inline void hyperv_stop_tsc_emulation(void) {}; 248 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 249 { 250 return NULL; 251 } 252 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 253 static inline int hyperv_flush_guest_mapping_range(u64 as, 254 hyperv_fill_flush_list_func fill_func, void *data) 255 { 256 return -1; 257 } 258 static inline void hv_set_register(unsigned int reg, u64 value) { } 259 static inline u64 hv_get_register(unsigned int reg) { return 0; } 260 static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { } 261 static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; } 262 static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages, 263 bool visible) 264 { 265 return -1; 266 } 267 #endif /* CONFIG_HYPERV */ 268 269 270 #include <asm-generic/mshyperv.h> 271 272 #endif 273