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