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/nospec-branch.h> 10 #include <asm/paravirt.h> 11 #include <hyperv/hvhdk.h> 12 13 /* 14 * Hyper-V always provides a single IO-APIC at this MMIO address. 15 * Ideally, the value should be looked up in ACPI tables, but it 16 * is needed for mapping the IO-APIC early in boot on Confidential 17 * VMs, before ACPI functions can be used. 18 */ 19 #define HV_IOAPIC_BASE_ADDRESS 0xfec00000 20 21 #define HV_VTL_NORMAL 0x0 22 #define HV_VTL_SECURE 0x1 23 #define HV_VTL_MGMT 0x2 24 25 union hv_ghcb; 26 27 DECLARE_STATIC_KEY_FALSE(isolation_type_snp); 28 DECLARE_STATIC_KEY_FALSE(isolation_type_tdx); 29 30 typedef int (*hyperv_fill_flush_list_func)( 31 struct hv_guest_mapping_flush_list *flush, 32 void *data); 33 34 void hyperv_vector_handler(struct pt_regs *regs); 35 36 static inline unsigned char hv_get_nmi_reason(void) 37 { 38 return 0; 39 } 40 41 #if IS_ENABLED(CONFIG_HYPERV) 42 extern bool hyperv_paravisor_present; 43 44 extern void *hv_hypercall_pg; 45 46 extern u64 hv_current_partition_id; 47 48 extern union hv_ghcb * __percpu *hv_ghcb_pg; 49 50 bool hv_isolation_type_snp(void); 51 bool hv_isolation_type_tdx(void); 52 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2); 53 54 /* 55 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA 56 * to start AP in enlightened SEV guest. 57 */ 58 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL 59 #define HV_AP_SEGMENT_LIMIT 0xffffffff 60 61 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 62 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 63 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 64 65 /* 66 * If the hypercall involves no input or output parameters, the hypervisor 67 * ignores the corresponding GPA pointer. 68 */ 69 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 70 { 71 u64 input_address = input ? virt_to_phys(input) : 0; 72 u64 output_address = output ? virt_to_phys(output) : 0; 73 u64 hv_status; 74 75 #ifdef CONFIG_X86_64 76 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 77 return hv_tdx_hypercall(control, input_address, output_address); 78 79 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 80 __asm__ __volatile__("mov %4, %%r8\n" 81 "vmmcall" 82 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 83 "+c" (control), "+d" (input_address) 84 : "r" (output_address) 85 : "cc", "memory", "r8", "r9", "r10", "r11"); 86 return hv_status; 87 } 88 89 if (!hv_hypercall_pg) 90 return U64_MAX; 91 92 __asm__ __volatile__("mov %4, %%r8\n" 93 CALL_NOSPEC 94 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 95 "+c" (control), "+d" (input_address) 96 : "r" (output_address), 97 THUNK_TARGET(hv_hypercall_pg) 98 : "cc", "memory", "r8", "r9", "r10", "r11"); 99 #else 100 u32 input_address_hi = upper_32_bits(input_address); 101 u32 input_address_lo = lower_32_bits(input_address); 102 u32 output_address_hi = upper_32_bits(output_address); 103 u32 output_address_lo = lower_32_bits(output_address); 104 105 if (!hv_hypercall_pg) 106 return U64_MAX; 107 108 __asm__ __volatile__(CALL_NOSPEC 109 : "=A" (hv_status), 110 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 111 : "A" (control), 112 "b" (input_address_hi), 113 "D"(output_address_hi), "S"(output_address_lo), 114 THUNK_TARGET(hv_hypercall_pg) 115 : "cc", "memory"); 116 #endif /* !x86_64 */ 117 return hv_status; 118 } 119 120 /* Hypercall to the L0 hypervisor */ 121 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) 122 { 123 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); 124 } 125 126 /* Fast hypercall with 8 bytes of input and no output */ 127 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 128 { 129 u64 hv_status; 130 131 #ifdef CONFIG_X86_64 132 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 133 return hv_tdx_hypercall(control, input1, 0); 134 135 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 136 __asm__ __volatile__( 137 "vmmcall" 138 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 139 "+c" (control), "+d" (input1) 140 :: "cc", "r8", "r9", "r10", "r11"); 141 } else { 142 __asm__ __volatile__(CALL_NOSPEC 143 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 144 "+c" (control), "+d" (input1) 145 : THUNK_TARGET(hv_hypercall_pg) 146 : "cc", "r8", "r9", "r10", "r11"); 147 } 148 #else 149 { 150 u32 input1_hi = upper_32_bits(input1); 151 u32 input1_lo = lower_32_bits(input1); 152 153 __asm__ __volatile__ (CALL_NOSPEC 154 : "=A"(hv_status), 155 "+c"(input1_lo), 156 ASM_CALL_CONSTRAINT 157 : "A" (control), 158 "b" (input1_hi), 159 THUNK_TARGET(hv_hypercall_pg) 160 : "cc", "edi", "esi"); 161 } 162 #endif 163 return hv_status; 164 } 165 166 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 167 { 168 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 169 170 return _hv_do_fast_hypercall8(control, input1); 171 } 172 173 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) 174 { 175 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 176 177 return _hv_do_fast_hypercall8(control, input1); 178 } 179 180 /* Fast hypercall with 16 bytes of input */ 181 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 182 { 183 u64 hv_status; 184 185 #ifdef CONFIG_X86_64 186 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 187 return hv_tdx_hypercall(control, input1, input2); 188 189 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 190 __asm__ __volatile__("mov %4, %%r8\n" 191 "vmmcall" 192 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 193 "+c" (control), "+d" (input1) 194 : "r" (input2) 195 : "cc", "r8", "r9", "r10", "r11"); 196 } else { 197 __asm__ __volatile__("mov %4, %%r8\n" 198 CALL_NOSPEC 199 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 200 "+c" (control), "+d" (input1) 201 : "r" (input2), 202 THUNK_TARGET(hv_hypercall_pg) 203 : "cc", "r8", "r9", "r10", "r11"); 204 } 205 #else 206 { 207 u32 input1_hi = upper_32_bits(input1); 208 u32 input1_lo = lower_32_bits(input1); 209 u32 input2_hi = upper_32_bits(input2); 210 u32 input2_lo = lower_32_bits(input2); 211 212 __asm__ __volatile__ (CALL_NOSPEC 213 : "=A"(hv_status), 214 "+c"(input1_lo), ASM_CALL_CONSTRAINT 215 : "A" (control), "b" (input1_hi), 216 "D"(input2_hi), "S"(input2_lo), 217 THUNK_TARGET(hv_hypercall_pg) 218 : "cc"); 219 } 220 #endif 221 return hv_status; 222 } 223 224 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 225 { 226 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 227 228 return _hv_do_fast_hypercall16(control, input1, input2); 229 } 230 231 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) 232 { 233 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 234 235 return _hv_do_fast_hypercall16(control, input1, input2); 236 } 237 238 extern struct hv_vp_assist_page **hv_vp_assist_page; 239 240 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 241 { 242 if (!hv_vp_assist_page) 243 return NULL; 244 245 return hv_vp_assist_page[cpu]; 246 } 247 248 void __init hyperv_init(void); 249 void hyperv_setup_mmu_ops(void); 250 void set_hv_tscchange_cb(void (*cb)(void)); 251 void clear_hv_tscchange_cb(void); 252 void hyperv_stop_tsc_emulation(void); 253 int hyperv_flush_guest_mapping(u64 as); 254 int hyperv_flush_guest_mapping_range(u64 as, 255 hyperv_fill_flush_list_func fill_func, void *data); 256 int hyperv_fill_flush_guest_mapping_list( 257 struct hv_guest_mapping_flush_list *flush, 258 u64 start_gfn, u64 end_gfn); 259 260 #ifdef CONFIG_X86_64 261 void hv_apic_init(void); 262 void __init hv_init_spinlocks(void); 263 bool hv_vcpu_is_preempted(int vcpu); 264 #else 265 static inline void hv_apic_init(void) {} 266 #endif 267 268 struct irq_domain *hv_create_pci_msi_domain(void); 269 270 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 271 struct hv_interrupt_entry *entry); 272 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 273 274 #ifdef CONFIG_AMD_MEM_ENCRYPT 275 bool hv_ghcb_negotiate_protocol(void); 276 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason); 277 int hv_snp_boot_ap(u32 cpu, unsigned long start_ip); 278 #else 279 static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 280 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 281 static inline int hv_snp_boot_ap(u32 cpu, unsigned long start_ip) { return 0; } 282 #endif 283 284 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST) 285 void hv_vtom_init(void); 286 void hv_ivm_msr_write(u64 msr, u64 value); 287 void hv_ivm_msr_read(u64 msr, u64 *value); 288 #else 289 static inline void hv_vtom_init(void) {} 290 static inline void hv_ivm_msr_write(u64 msr, u64 value) {} 291 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {} 292 #endif 293 294 static inline bool hv_is_synic_msr(unsigned int reg) 295 { 296 return (reg >= HV_X64_MSR_SCONTROL) && 297 (reg <= HV_X64_MSR_SINT15); 298 } 299 300 static inline bool hv_is_sint_msr(unsigned int reg) 301 { 302 return (reg >= HV_X64_MSR_SINT0) && 303 (reg <= HV_X64_MSR_SINT15); 304 } 305 306 u64 hv_get_msr(unsigned int reg); 307 void hv_set_msr(unsigned int reg, u64 value); 308 u64 hv_get_non_nested_msr(unsigned int reg); 309 void hv_set_non_nested_msr(unsigned int reg, u64 value); 310 311 static __always_inline u64 hv_raw_get_msr(unsigned int reg) 312 { 313 return __rdmsr(reg); 314 } 315 316 #else /* CONFIG_HYPERV */ 317 static inline void hyperv_init(void) {} 318 static inline void hyperv_setup_mmu_ops(void) {} 319 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 320 static inline void clear_hv_tscchange_cb(void) {} 321 static inline void hyperv_stop_tsc_emulation(void) {}; 322 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 323 { 324 return NULL; 325 } 326 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 327 static inline int hyperv_flush_guest_mapping_range(u64 as, 328 hyperv_fill_flush_list_func fill_func, void *data) 329 { 330 return -1; 331 } 332 static inline void hv_set_msr(unsigned int reg, u64 value) { } 333 static inline u64 hv_get_msr(unsigned int reg) { return 0; } 334 static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { } 335 static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; } 336 #endif /* CONFIG_HYPERV */ 337 338 339 #ifdef CONFIG_HYPERV_VTL_MODE 340 void __init hv_vtl_init_platform(void); 341 int __init hv_vtl_early_init(void); 342 #else 343 static inline void __init hv_vtl_init_platform(void) {} 344 static inline int __init hv_vtl_early_init(void) { return 0; } 345 #endif 346 347 #include <asm-generic/mshyperv.h> 348 349 #endif 350