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 bool hyperv_paravisor_present; 44 45 extern void *hv_hypercall_pg; 46 47 extern u64 hv_current_partition_id; 48 49 extern union hv_ghcb * __percpu *hv_ghcb_pg; 50 51 bool hv_isolation_type_snp(void); 52 bool hv_isolation_type_tdx(void); 53 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2); 54 55 /* 56 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA 57 * to start AP in enlightened SEV guest. 58 */ 59 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL 60 #define HV_AP_SEGMENT_LIMIT 0xffffffff 61 62 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 63 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 64 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 65 66 /* 67 * If the hypercall involves no input or output parameters, the hypervisor 68 * ignores the corresponding GPA pointer. 69 */ 70 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 71 { 72 u64 input_address = input ? virt_to_phys(input) : 0; 73 u64 output_address = output ? virt_to_phys(output) : 0; 74 u64 hv_status; 75 76 #ifdef CONFIG_X86_64 77 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 78 return hv_tdx_hypercall(control, input_address, output_address); 79 80 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 81 __asm__ __volatile__("mov %4, %%r8\n" 82 "vmmcall" 83 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 84 "+c" (control), "+d" (input_address) 85 : "r" (output_address) 86 : "cc", "memory", "r8", "r9", "r10", "r11"); 87 return hv_status; 88 } 89 90 if (!hv_hypercall_pg) 91 return U64_MAX; 92 93 __asm__ __volatile__("mov %4, %%r8\n" 94 CALL_NOSPEC 95 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 96 "+c" (control), "+d" (input_address) 97 : "r" (output_address), 98 THUNK_TARGET(hv_hypercall_pg) 99 : "cc", "memory", "r8", "r9", "r10", "r11"); 100 #else 101 u32 input_address_hi = upper_32_bits(input_address); 102 u32 input_address_lo = lower_32_bits(input_address); 103 u32 output_address_hi = upper_32_bits(output_address); 104 u32 output_address_lo = lower_32_bits(output_address); 105 106 if (!hv_hypercall_pg) 107 return U64_MAX; 108 109 __asm__ __volatile__(CALL_NOSPEC 110 : "=A" (hv_status), 111 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 112 : "A" (control), 113 "b" (input_address_hi), 114 "D"(output_address_hi), "S"(output_address_lo), 115 THUNK_TARGET(hv_hypercall_pg) 116 : "cc", "memory"); 117 #endif /* !x86_64 */ 118 return hv_status; 119 } 120 121 /* Hypercall to the L0 hypervisor */ 122 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) 123 { 124 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); 125 } 126 127 /* Fast hypercall with 8 bytes of input and no output */ 128 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 129 { 130 u64 hv_status; 131 132 #ifdef CONFIG_X86_64 133 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 134 return hv_tdx_hypercall(control, input1, 0); 135 136 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 137 __asm__ __volatile__( 138 "vmmcall" 139 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 140 "+c" (control), "+d" (input1) 141 :: "cc", "r8", "r9", "r10", "r11"); 142 } else { 143 __asm__ __volatile__(CALL_NOSPEC 144 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 145 "+c" (control), "+d" (input1) 146 : THUNK_TARGET(hv_hypercall_pg) 147 : "cc", "r8", "r9", "r10", "r11"); 148 } 149 #else 150 { 151 u32 input1_hi = upper_32_bits(input1); 152 u32 input1_lo = lower_32_bits(input1); 153 154 __asm__ __volatile__ (CALL_NOSPEC 155 : "=A"(hv_status), 156 "+c"(input1_lo), 157 ASM_CALL_CONSTRAINT 158 : "A" (control), 159 "b" (input1_hi), 160 THUNK_TARGET(hv_hypercall_pg) 161 : "cc", "edi", "esi"); 162 } 163 #endif 164 return hv_status; 165 } 166 167 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 168 { 169 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 170 171 return _hv_do_fast_hypercall8(control, input1); 172 } 173 174 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) 175 { 176 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 177 178 return _hv_do_fast_hypercall8(control, input1); 179 } 180 181 /* Fast hypercall with 16 bytes of input */ 182 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 183 { 184 u64 hv_status; 185 186 #ifdef CONFIG_X86_64 187 if (hv_isolation_type_tdx() && !hyperv_paravisor_present) 188 return hv_tdx_hypercall(control, input1, input2); 189 190 if (hv_isolation_type_snp() && !hyperv_paravisor_present) { 191 __asm__ __volatile__("mov %4, %%r8\n" 192 "vmmcall" 193 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 194 "+c" (control), "+d" (input1) 195 : "r" (input2) 196 : "cc", "r8", "r9", "r10", "r11"); 197 } else { 198 __asm__ __volatile__("mov %4, %%r8\n" 199 CALL_NOSPEC 200 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 201 "+c" (control), "+d" (input1) 202 : "r" (input2), 203 THUNK_TARGET(hv_hypercall_pg) 204 : "cc", "r8", "r9", "r10", "r11"); 205 } 206 #else 207 { 208 u32 input1_hi = upper_32_bits(input1); 209 u32 input1_lo = lower_32_bits(input1); 210 u32 input2_hi = upper_32_bits(input2); 211 u32 input2_lo = lower_32_bits(input2); 212 213 __asm__ __volatile__ (CALL_NOSPEC 214 : "=A"(hv_status), 215 "+c"(input1_lo), ASM_CALL_CONSTRAINT 216 : "A" (control), "b" (input1_hi), 217 "D"(input2_hi), "S"(input2_lo), 218 THUNK_TARGET(hv_hypercall_pg) 219 : "cc"); 220 } 221 #endif 222 return hv_status; 223 } 224 225 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 226 { 227 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 228 229 return _hv_do_fast_hypercall16(control, input1, input2); 230 } 231 232 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) 233 { 234 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 235 236 return _hv_do_fast_hypercall16(control, input1, input2); 237 } 238 239 extern struct hv_vp_assist_page **hv_vp_assist_page; 240 241 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 242 { 243 if (!hv_vp_assist_page) 244 return NULL; 245 246 return hv_vp_assist_page[cpu]; 247 } 248 249 void __init hyperv_init(void); 250 void hyperv_setup_mmu_ops(void); 251 void set_hv_tscchange_cb(void (*cb)(void)); 252 void clear_hv_tscchange_cb(void); 253 void hyperv_stop_tsc_emulation(void); 254 int hyperv_flush_guest_mapping(u64 as); 255 int hyperv_flush_guest_mapping_range(u64 as, 256 hyperv_fill_flush_list_func fill_func, void *data); 257 int hyperv_fill_flush_guest_mapping_list( 258 struct hv_guest_mapping_flush_list *flush, 259 u64 start_gfn, u64 end_gfn); 260 261 #ifdef CONFIG_X86_64 262 void hv_apic_init(void); 263 void __init hv_init_spinlocks(void); 264 bool hv_vcpu_is_preempted(int vcpu); 265 #else 266 static inline void hv_apic_init(void) {} 267 #endif 268 269 struct irq_domain *hv_create_pci_msi_domain(void); 270 271 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 272 struct hv_interrupt_entry *entry); 273 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 274 275 #ifdef CONFIG_AMD_MEM_ENCRYPT 276 bool hv_ghcb_negotiate_protocol(void); 277 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason); 278 int hv_snp_boot_ap(u32 cpu, unsigned long start_ip); 279 #else 280 static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 281 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 282 static inline int hv_snp_boot_ap(u32 cpu, unsigned long start_ip) { return 0; } 283 #endif 284 285 #if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST) 286 void hv_vtom_init(void); 287 void hv_ivm_msr_write(u64 msr, u64 value); 288 void hv_ivm_msr_read(u64 msr, u64 *value); 289 #else 290 static inline void hv_vtom_init(void) {} 291 static inline void hv_ivm_msr_write(u64 msr, u64 value) {} 292 static inline void hv_ivm_msr_read(u64 msr, u64 *value) {} 293 #endif 294 295 static inline bool hv_is_synic_msr(unsigned int reg) 296 { 297 return (reg >= HV_X64_MSR_SCONTROL) && 298 (reg <= HV_X64_MSR_SINT15); 299 } 300 301 static inline bool hv_is_sint_msr(unsigned int reg) 302 { 303 return (reg >= HV_X64_MSR_SINT0) && 304 (reg <= HV_X64_MSR_SINT15); 305 } 306 307 u64 hv_get_msr(unsigned int reg); 308 void hv_set_msr(unsigned int reg, u64 value); 309 u64 hv_get_non_nested_msr(unsigned int reg); 310 void hv_set_non_nested_msr(unsigned int reg, u64 value); 311 312 static __always_inline u64 hv_raw_get_msr(unsigned int reg) 313 { 314 return __rdmsr(reg); 315 } 316 317 #else /* CONFIG_HYPERV */ 318 static inline void hyperv_init(void) {} 319 static inline void hyperv_setup_mmu_ops(void) {} 320 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 321 static inline void clear_hv_tscchange_cb(void) {} 322 static inline void hyperv_stop_tsc_emulation(void) {}; 323 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 324 { 325 return NULL; 326 } 327 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 328 static inline int hyperv_flush_guest_mapping_range(u64 as, 329 hyperv_fill_flush_list_func fill_func, void *data) 330 { 331 return -1; 332 } 333 static inline void hv_set_msr(unsigned int reg, u64 value) { } 334 static inline u64 hv_get_msr(unsigned int reg) { return 0; } 335 static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { } 336 static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; } 337 #endif /* CONFIG_HYPERV */ 338 339 340 #ifdef CONFIG_HYPERV_VTL_MODE 341 void __init hv_vtl_init_platform(void); 342 int __init hv_vtl_early_init(void); 343 #else 344 static inline void __init hv_vtl_init_platform(void) {} 345 static inline int __init hv_vtl_early_init(void) { return 0; } 346 #endif 347 348 #include <asm-generic/mshyperv.h> 349 350 #endif 351