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 /* 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_en_snp); 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 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 extern bool hv_isolation_type_en_snp(void); 52 /* 53 * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA 54 * to start AP in enlightened SEV guest. 55 */ 56 #define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL 57 #define HV_AP_SEGMENT_LIMIT 0xffffffff 58 59 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 60 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 61 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 62 63 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 64 { 65 u64 input_address = input ? virt_to_phys(input) : 0; 66 u64 output_address = output ? virt_to_phys(output) : 0; 67 u64 hv_status; 68 69 #ifdef CONFIG_X86_64 70 if (hv_isolation_type_en_snp()) { 71 __asm__ __volatile__("mov %4, %%r8\n" 72 "vmmcall" 73 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 74 "+c" (control), "+d" (input_address) 75 : "r" (output_address) 76 : "cc", "memory", "r8", "r9", "r10", "r11"); 77 return hv_status; 78 } 79 80 if (!hv_hypercall_pg) 81 return U64_MAX; 82 83 __asm__ __volatile__("mov %4, %%r8\n" 84 CALL_NOSPEC 85 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 86 "+c" (control), "+d" (input_address) 87 : "r" (output_address), 88 THUNK_TARGET(hv_hypercall_pg) 89 : "cc", "memory", "r8", "r9", "r10", "r11"); 90 #else 91 u32 input_address_hi = upper_32_bits(input_address); 92 u32 input_address_lo = lower_32_bits(input_address); 93 u32 output_address_hi = upper_32_bits(output_address); 94 u32 output_address_lo = lower_32_bits(output_address); 95 96 if (!hv_hypercall_pg) 97 return U64_MAX; 98 99 __asm__ __volatile__(CALL_NOSPEC 100 : "=A" (hv_status), 101 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 102 : "A" (control), 103 "b" (input_address_hi), 104 "D"(output_address_hi), "S"(output_address_lo), 105 THUNK_TARGET(hv_hypercall_pg) 106 : "cc", "memory"); 107 #endif /* !x86_64 */ 108 return hv_status; 109 } 110 111 /* Hypercall to the L0 hypervisor */ 112 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) 113 { 114 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); 115 } 116 117 /* Fast hypercall with 8 bytes of input and no output */ 118 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 119 { 120 u64 hv_status; 121 122 #ifdef CONFIG_X86_64 123 if (hv_isolation_type_en_snp()) { 124 __asm__ __volatile__( 125 "vmmcall" 126 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 127 "+c" (control), "+d" (input1) 128 :: "cc", "r8", "r9", "r10", "r11"); 129 } else { 130 __asm__ __volatile__(CALL_NOSPEC 131 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 132 "+c" (control), "+d" (input1) 133 : THUNK_TARGET(hv_hypercall_pg) 134 : "cc", "r8", "r9", "r10", "r11"); 135 } 136 #else 137 { 138 u32 input1_hi = upper_32_bits(input1); 139 u32 input1_lo = lower_32_bits(input1); 140 141 __asm__ __volatile__ (CALL_NOSPEC 142 : "=A"(hv_status), 143 "+c"(input1_lo), 144 ASM_CALL_CONSTRAINT 145 : "A" (control), 146 "b" (input1_hi), 147 THUNK_TARGET(hv_hypercall_pg) 148 : "cc", "edi", "esi"); 149 } 150 #endif 151 return hv_status; 152 } 153 154 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 155 { 156 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 157 158 return _hv_do_fast_hypercall8(control, input1); 159 } 160 161 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) 162 { 163 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 164 165 return _hv_do_fast_hypercall8(control, input1); 166 } 167 168 /* Fast hypercall with 16 bytes of input */ 169 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 170 { 171 u64 hv_status; 172 173 #ifdef CONFIG_X86_64 174 if (hv_isolation_type_en_snp()) { 175 __asm__ __volatile__("mov %4, %%r8\n" 176 "vmmcall" 177 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 178 "+c" (control), "+d" (input1) 179 : "r" (input2) 180 : "cc", "r8", "r9", "r10", "r11"); 181 } else { 182 __asm__ __volatile__("mov %4, %%r8\n" 183 CALL_NOSPEC 184 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 185 "+c" (control), "+d" (input1) 186 : "r" (input2), 187 THUNK_TARGET(hv_hypercall_pg) 188 : "cc", "r8", "r9", "r10", "r11"); 189 } 190 #else 191 { 192 u32 input1_hi = upper_32_bits(input1); 193 u32 input1_lo = lower_32_bits(input1); 194 u32 input2_hi = upper_32_bits(input2); 195 u32 input2_lo = lower_32_bits(input2); 196 197 __asm__ __volatile__ (CALL_NOSPEC 198 : "=A"(hv_status), 199 "+c"(input1_lo), ASM_CALL_CONSTRAINT 200 : "A" (control), "b" (input1_hi), 201 "D"(input2_hi), "S"(input2_lo), 202 THUNK_TARGET(hv_hypercall_pg) 203 : "cc"); 204 } 205 #endif 206 return hv_status; 207 } 208 209 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 210 { 211 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 212 213 return _hv_do_fast_hypercall16(control, input1, input2); 214 } 215 216 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) 217 { 218 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 219 220 return _hv_do_fast_hypercall16(control, input1, input2); 221 } 222 223 extern struct hv_vp_assist_page **hv_vp_assist_page; 224 225 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 226 { 227 if (!hv_vp_assist_page) 228 return NULL; 229 230 return hv_vp_assist_page[cpu]; 231 } 232 233 void __init hyperv_init(void); 234 void hyperv_setup_mmu_ops(void); 235 void set_hv_tscchange_cb(void (*cb)(void)); 236 void clear_hv_tscchange_cb(void); 237 void hyperv_stop_tsc_emulation(void); 238 int hyperv_flush_guest_mapping(u64 as); 239 int hyperv_flush_guest_mapping_range(u64 as, 240 hyperv_fill_flush_list_func fill_func, void *data); 241 int hyperv_fill_flush_guest_mapping_list( 242 struct hv_guest_mapping_flush_list *flush, 243 u64 start_gfn, u64 end_gfn); 244 245 #ifdef CONFIG_X86_64 246 void hv_apic_init(void); 247 void __init hv_init_spinlocks(void); 248 bool hv_vcpu_is_preempted(int vcpu); 249 #else 250 static inline void hv_apic_init(void) {} 251 #endif 252 253 struct irq_domain *hv_create_pci_msi_domain(void); 254 255 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 256 struct hv_interrupt_entry *entry); 257 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 258 259 #ifdef CONFIG_AMD_MEM_ENCRYPT 260 void hv_ghcb_msr_write(u64 msr, u64 value); 261 void hv_ghcb_msr_read(u64 msr, u64 *value); 262 bool hv_ghcb_negotiate_protocol(void); 263 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason); 264 void hv_vtom_init(void); 265 int hv_snp_boot_ap(int cpu, unsigned long start_ip); 266 #else 267 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} 268 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} 269 static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 270 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 271 static inline void hv_vtom_init(void) {} 272 static int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; } 273 #endif 274 275 extern bool hv_isolation_type_snp(void); 276 277 static inline bool hv_is_synic_reg(unsigned int reg) 278 { 279 return (reg >= HV_REGISTER_SCONTROL) && 280 (reg <= HV_REGISTER_SINT15); 281 } 282 283 static inline bool hv_is_sint_reg(unsigned int reg) 284 { 285 return (reg >= HV_REGISTER_SINT0) && 286 (reg <= HV_REGISTER_SINT15); 287 } 288 289 u64 hv_get_register(unsigned int reg); 290 void hv_set_register(unsigned int reg, u64 value); 291 u64 hv_get_non_nested_register(unsigned int reg); 292 void hv_set_non_nested_register(unsigned int reg, u64 value); 293 294 static __always_inline u64 hv_raw_get_register(unsigned int reg) 295 { 296 return __rdmsr(reg); 297 } 298 299 #else /* CONFIG_HYPERV */ 300 static inline void hyperv_init(void) {} 301 static inline void hyperv_setup_mmu_ops(void) {} 302 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 303 static inline void clear_hv_tscchange_cb(void) {} 304 static inline void hyperv_stop_tsc_emulation(void) {}; 305 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 306 { 307 return NULL; 308 } 309 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 310 static inline int hyperv_flush_guest_mapping_range(u64 as, 311 hyperv_fill_flush_list_func fill_func, void *data) 312 { 313 return -1; 314 } 315 static inline void hv_set_register(unsigned int reg, u64 value) { } 316 static inline u64 hv_get_register(unsigned int reg) { return 0; } 317 static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { } 318 static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; } 319 #endif /* CONFIG_HYPERV */ 320 321 322 #ifdef CONFIG_HYPERV_VTL_MODE 323 void __init hv_vtl_init_platform(void); 324 #else 325 static inline void __init hv_vtl_init_platform(void) {} 326 #endif 327 328 #include <asm-generic/mshyperv.h> 329 330 #endif 331