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