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 <linux/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 /* 15 * Hyper-V always provides a single IO-APIC at this MMIO address. 16 * Ideally, the value should be looked up in ACPI tables, but it 17 * is needed for mapping the IO-APIC early in boot on Confidential 18 * VMs, before ACPI functions can be used. 19 */ 20 #define HV_IOAPIC_BASE_ADDRESS 0xfec00000 21 22 #define HV_VTL_NORMAL 0x0 23 #define HV_VTL_SECURE 0x1 24 #define HV_VTL_MGMT 0x2 25 26 union hv_ghcb; 27 28 DECLARE_STATIC_KEY_FALSE(isolation_type_snp); 29 DECLARE_STATIC_KEY_FALSE(isolation_type_tdx); 30 31 typedef int (*hyperv_fill_flush_list_func)( 32 struct hv_guest_mapping_flush_list *flush, 33 void *data); 34 35 void hyperv_vector_handler(struct pt_regs *regs); 36 37 static inline unsigned char hv_get_nmi_reason(void) 38 { 39 return 0; 40 } 41 42 #if IS_ENABLED(CONFIG_HYPERV) 43 extern int hyperv_init_cpuhp; 44 extern bool hyperv_paravisor_present; 45 46 extern void *hv_hypercall_pg; 47 48 extern u64 hv_current_partition_id; 49 50 extern union hv_ghcb * __percpu *hv_ghcb_pg; 51 52 bool hv_isolation_type_snp(void); 53 bool hv_isolation_type_tdx(void); 54 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2); 55 56 /* 57 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA 58 * to start AP in enlightened SEV guest. 59 */ 60 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL 61 #define HV_AP_SEGMENT_LIMIT 0xffffffff 62 63 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 64 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 65 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 66 67 /* 68 * If the hypercall involves no input or output parameters, the hypervisor 69 * ignores the corresponding GPA pointer. 70 */ 71 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 72 { 73 u64 input_address = input ? virt_to_phys(input) : 0; 74 u64 output_address = output ? virt_to_phys(output) : 0; 75 u64 hv_status; 76 77 #ifdef CONFIG_X86_64 78 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 79 return hv_tdx_hypercall(control, input_address, output_address); 80 81 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 82 __asm__ __volatile__("mov %4, %%r8\n" 83 "vmmcall" 84 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 85 "+c" (control), "+d" (input_address) 86 : "r" (output_address) 87 : "cc", "memory", "r8", "r9", "r10", "r11"); 88 return hv_status; 89 } 90 91 if (!hv_hypercall_pg) 92 return U64_MAX; 93 94 __asm__ __volatile__("mov %4, %%r8\n" 95 CALL_NOSPEC 96 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 97 "+c" (control), "+d" (input_address) 98 : "r" (output_address), 99 THUNK_TARGET(hv_hypercall_pg) 100 : "cc", "memory", "r8", "r9", "r10", "r11"); 101 #else 102 u32 input_address_hi = upper_32_bits(input_address); 103 u32 input_address_lo = lower_32_bits(input_address); 104 u32 output_address_hi = upper_32_bits(output_address); 105 u32 output_address_lo = lower_32_bits(output_address); 106 107 if (!hv_hypercall_pg) 108 return U64_MAX; 109 110 __asm__ __volatile__(CALL_NOSPEC 111 : "=A" (hv_status), 112 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 113 : "A" (control), 114 "b" (input_address_hi), 115 "D"(output_address_hi), "S"(output_address_lo), 116 THUNK_TARGET(hv_hypercall_pg) 117 : "cc", "memory"); 118 #endif /* !x86_64 */ 119 return hv_status; 120 } 121 122 /* Hypercall to the L0 hypervisor */ 123 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) 124 { 125 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); 126 } 127 128 /* Fast hypercall with 8 bytes of input and no output */ 129 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 130 { 131 u64 hv_status; 132 133 #ifdef CONFIG_X86_64 134 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 135 return hv_tdx_hypercall(control, input1, 0); 136 137 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 138 __asm__ __volatile__( 139 "vmmcall" 140 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 141 "+c" (control), "+d" (input1) 142 :: "cc", "r8", "r9", "r10", "r11"); 143 } else { 144 __asm__ __volatile__(CALL_NOSPEC 145 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 146 "+c" (control), "+d" (input1) 147 : THUNK_TARGET(hv_hypercall_pg) 148 : "cc", "r8", "r9", "r10", "r11"); 149 } 150 #else 151 { 152 u32 input1_hi = upper_32_bits(input1); 153 u32 input1_lo = lower_32_bits(input1); 154 155 __asm__ __volatile__ (CALL_NOSPEC 156 : "=A"(hv_status), 157 "+c"(input1_lo), 158 ASM_CALL_CONSTRAINT 159 : "A" (control), 160 "b" (input1_hi), 161 THUNK_TARGET(hv_hypercall_pg) 162 : "cc", "edi", "esi"); 163 } 164 #endif 165 return hv_status; 166 } 167 168 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 169 { 170 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 171 172 return _hv_do_fast_hypercall8(control, input1); 173 } 174 175 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) 176 { 177 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 178 179 return _hv_do_fast_hypercall8(control, input1); 180 } 181 182 /* Fast hypercall with 16 bytes of input */ 183 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 184 { 185 u64 hv_status; 186 187 #ifdef CONFIG_X86_64 188 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 189 return hv_tdx_hypercall(control, input1, input2); 190 191 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 192 __asm__ __volatile__("mov %4, %%r8\n" 193 "vmmcall" 194 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 195 "+c" (control), "+d" (input1) 196 : "r" (input2) 197 : "cc", "r8", "r9", "r10", "r11"); 198 } else { 199 __asm__ __volatile__("mov %4, %%r8\n" 200 CALL_NOSPEC 201 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 202 "+c" (control), "+d" (input1) 203 : "r" (input2), 204 THUNK_TARGET(hv_hypercall_pg) 205 : "cc", "r8", "r9", "r10", "r11"); 206 } 207 #else 208 { 209 u32 input1_hi = upper_32_bits(input1); 210 u32 input1_lo = lower_32_bits(input1); 211 u32 input2_hi = upper_32_bits(input2); 212 u32 input2_lo = lower_32_bits(input2); 213 214 __asm__ __volatile__ (CALL_NOSPEC 215 : "=A"(hv_status), 216 "+c"(input1_lo), ASM_CALL_CONSTRAINT 217 : "A" (control), "b" (input1_hi), 218 "D"(input2_hi), "S"(input2_lo), 219 THUNK_TARGET(hv_hypercall_pg) 220 : "cc"); 221 } 222 #endif 223 return hv_status; 224 } 225 226 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 227 { 228 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 229 230 return _hv_do_fast_hypercall16(control, input1, input2); 231 } 232 233 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) 234 { 235 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 236 237 return _hv_do_fast_hypercall16(control, input1, input2); 238 } 239 240 extern struct hv_vp_assist_page **hv_vp_assist_page; 241 242 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 243 { 244 if (!hv_vp_assist_page) 245 return NULL; 246 247 return hv_vp_assist_page[cpu]; 248 } 249 250 void __init hyperv_init(void); 251 void hyperv_setup_mmu_ops(void); 252 void set_hv_tscchange_cb(void (*cb)(void)); 253 void clear_hv_tscchange_cb(void); 254 void hyperv_stop_tsc_emulation(void); 255 int hyperv_flush_guest_mapping(u64 as); 256 int hyperv_flush_guest_mapping_range(u64 as, 257 hyperv_fill_flush_list_func fill_func, void *data); 258 int hyperv_fill_flush_guest_mapping_list( 259 struct hv_guest_mapping_flush_list *flush, 260 u64 start_gfn, u64 end_gfn); 261 262 #ifdef CONFIG_X86_64 263 void hv_apic_init(void); 264 void __init hv_init_spinlocks(void); 265 bool hv_vcpu_is_preempted(int vcpu); 266 #else 267 static inline void hv_apic_init(void) {} 268 #endif 269 270 struct irq_domain *hv_create_pci_msi_domain(void); 271 272 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 273 struct hv_interrupt_entry *entry); 274 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 275 276 #ifdef CONFIG_AMD_MEM_ENCRYPT 277 bool hv_ghcb_negotiate_protocol(void); 278 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason); 279 int hv_snp_boot_ap(int cpu, unsigned long start_ip); 280 #else 281 static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 282 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 283 static inline int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; } 284 #endif 285 286 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST) 287 void hv_vtom_init(void); 288 void hv_ivm_msr_write(u64 msr, u64 value); 289 void hv_ivm_msr_read(u64 msr, u64 *value); 290 #else 291 static inline void hv_vtom_init(void) {} 292 static inline void hv_ivm_msr_write(u64 msr, u64 value) {} 293 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {} 294 #endif 295 296 static inline bool hv_is_synic_reg(unsigned int reg) 297 { 298 return (reg >= HV_REGISTER_SCONTROL) && 299 (reg <= HV_REGISTER_SINT15); 300 } 301 302 static inline bool hv_is_sint_reg(unsigned int reg) 303 { 304 return (reg >= HV_REGISTER_SINT0) && 305 (reg <= HV_REGISTER_SINT15); 306 } 307 308 u64 hv_get_register(unsigned int reg); 309 void hv_set_register(unsigned int reg, u64 value); 310 u64 hv_get_non_nested_register(unsigned int reg); 311 void hv_set_non_nested_register(unsigned int reg, u64 value); 312 313 static __always_inline u64 hv_raw_get_register(unsigned int reg) 314 { 315 return __rdmsr(reg); 316 } 317 318 #else /* CONFIG_HYPERV */ 319 static inline void hyperv_init(void) {} 320 static inline void hyperv_setup_mmu_ops(void) {} 321 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 322 static inline void clear_hv_tscchange_cb(void) {} 323 static inline void hyperv_stop_tsc_emulation(void) {}; 324 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 325 { 326 return NULL; 327 } 328 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 329 static inline int hyperv_flush_guest_mapping_range(u64 as, 330 hyperv_fill_flush_list_func fill_func, void *data) 331 { 332 return -1; 333 } 334 static inline void hv_set_register(unsigned int reg, u64 value) { } 335 static inline u64 hv_get_register(unsigned int reg) { return 0; } 336 static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { } 337 static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; } 338 #endif /* CONFIG_HYPERV */ 339 340 341 #ifdef CONFIG_HYPERV_VTL_MODE 342 void __init hv_vtl_init_platform(void); 343 #else 344 static inline void __init hv_vtl_init_platform(void) {} 345 #endif 346 347 #include <asm-generic/mshyperv.h> 348 349 #endif 350