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 union hv_ghcb; 23 24 DECLARE_STATIC_KEY_FALSE(isolation_type_snp); 25 26 typedef int (*hyperv_fill_flush_list_func)( 27 struct hv_guest_mapping_flush_list *flush, 28 void *data); 29 30 void hyperv_vector_handler(struct pt_regs *regs); 31 32 static inline unsigned char hv_get_nmi_reason(void) 33 { 34 return 0; 35 } 36 37 #if IS_ENABLED(CONFIG_HYPERV) 38 extern int hyperv_init_cpuhp; 39 40 extern void *hv_hypercall_pg; 41 42 extern u64 hv_current_partition_id; 43 44 extern union hv_ghcb * __percpu *hv_ghcb_pg; 45 46 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 47 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 48 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 49 50 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 51 { 52 u64 input_address = input ? virt_to_phys(input) : 0; 53 u64 output_address = output ? virt_to_phys(output) : 0; 54 u64 hv_status; 55 56 #ifdef CONFIG_X86_64 57 if (!hv_hypercall_pg) 58 return U64_MAX; 59 60 __asm__ __volatile__("mov %4, %%r8\n" 61 CALL_NOSPEC 62 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 63 "+c" (control), "+d" (input_address) 64 : "r" (output_address), 65 THUNK_TARGET(hv_hypercall_pg) 66 : "cc", "memory", "r8", "r9", "r10", "r11"); 67 #else 68 u32 input_address_hi = upper_32_bits(input_address); 69 u32 input_address_lo = lower_32_bits(input_address); 70 u32 output_address_hi = upper_32_bits(output_address); 71 u32 output_address_lo = lower_32_bits(output_address); 72 73 if (!hv_hypercall_pg) 74 return U64_MAX; 75 76 __asm__ __volatile__(CALL_NOSPEC 77 : "=A" (hv_status), 78 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 79 : "A" (control), 80 "b" (input_address_hi), 81 "D"(output_address_hi), "S"(output_address_lo), 82 THUNK_TARGET(hv_hypercall_pg) 83 : "cc", "memory"); 84 #endif /* !x86_64 */ 85 return hv_status; 86 } 87 88 /* Hypercall to the L0 hypervisor */ 89 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output) 90 { 91 return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output); 92 } 93 94 /* Fast hypercall with 8 bytes of input and no output */ 95 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) 96 { 97 u64 hv_status; 98 99 #ifdef CONFIG_X86_64 100 { 101 __asm__ __volatile__(CALL_NOSPEC 102 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 103 "+c" (control), "+d" (input1) 104 : THUNK_TARGET(hv_hypercall_pg) 105 : "cc", "r8", "r9", "r10", "r11"); 106 } 107 #else 108 { 109 u32 input1_hi = upper_32_bits(input1); 110 u32 input1_lo = lower_32_bits(input1); 111 112 __asm__ __volatile__ (CALL_NOSPEC 113 : "=A"(hv_status), 114 "+c"(input1_lo), 115 ASM_CALL_CONSTRAINT 116 : "A" (control), 117 "b" (input1_hi), 118 THUNK_TARGET(hv_hypercall_pg) 119 : "cc", "edi", "esi"); 120 } 121 #endif 122 return hv_status; 123 } 124 125 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 126 { 127 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 128 129 return _hv_do_fast_hypercall8(control, input1); 130 } 131 132 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1) 133 { 134 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 135 136 return _hv_do_fast_hypercall8(control, input1); 137 } 138 139 /* Fast hypercall with 16 bytes of input */ 140 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) 141 { 142 u64 hv_status; 143 144 #ifdef CONFIG_X86_64 145 { 146 __asm__ __volatile__("mov %4, %%r8\n" 147 CALL_NOSPEC 148 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 149 "+c" (control), "+d" (input1) 150 : "r" (input2), 151 THUNK_TARGET(hv_hypercall_pg) 152 : "cc", "r8", "r9", "r10", "r11"); 153 } 154 #else 155 { 156 u32 input1_hi = upper_32_bits(input1); 157 u32 input1_lo = lower_32_bits(input1); 158 u32 input2_hi = upper_32_bits(input2); 159 u32 input2_lo = lower_32_bits(input2); 160 161 __asm__ __volatile__ (CALL_NOSPEC 162 : "=A"(hv_status), 163 "+c"(input1_lo), ASM_CALL_CONSTRAINT 164 : "A" (control), "b" (input1_hi), 165 "D"(input2_hi), "S"(input2_lo), 166 THUNK_TARGET(hv_hypercall_pg) 167 : "cc"); 168 } 169 #endif 170 return hv_status; 171 } 172 173 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 174 { 175 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT; 176 177 return _hv_do_fast_hypercall16(control, input1, input2); 178 } 179 180 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2) 181 { 182 u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED; 183 184 return _hv_do_fast_hypercall16(control, input1, input2); 185 } 186 187 extern struct hv_vp_assist_page **hv_vp_assist_page; 188 189 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 190 { 191 if (!hv_vp_assist_page) 192 return NULL; 193 194 return hv_vp_assist_page[cpu]; 195 } 196 197 void __init hyperv_init(void); 198 void hyperv_setup_mmu_ops(void); 199 void set_hv_tscchange_cb(void (*cb)(void)); 200 void clear_hv_tscchange_cb(void); 201 void hyperv_stop_tsc_emulation(void); 202 int hyperv_flush_guest_mapping(u64 as); 203 int hyperv_flush_guest_mapping_range(u64 as, 204 hyperv_fill_flush_list_func fill_func, void *data); 205 int hyperv_fill_flush_guest_mapping_list( 206 struct hv_guest_mapping_flush_list *flush, 207 u64 start_gfn, u64 end_gfn); 208 209 #ifdef CONFIG_X86_64 210 void hv_apic_init(void); 211 void __init hv_init_spinlocks(void); 212 bool hv_vcpu_is_preempted(int vcpu); 213 #else 214 static inline void hv_apic_init(void) {} 215 #endif 216 217 struct irq_domain *hv_create_pci_msi_domain(void); 218 219 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 220 struct hv_interrupt_entry *entry); 221 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 222 223 #ifdef CONFIG_AMD_MEM_ENCRYPT 224 void hv_ghcb_msr_write(u64 msr, u64 value); 225 void hv_ghcb_msr_read(u64 msr, u64 *value); 226 bool hv_ghcb_negotiate_protocol(void); 227 void hv_ghcb_terminate(unsigned int set, unsigned int reason); 228 void hv_vtom_init(void); 229 #else 230 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} 231 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} 232 static inline bool hv_ghcb_negotiate_protocol(void) { return false; } 233 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} 234 static inline void hv_vtom_init(void) {} 235 #endif 236 237 extern bool hv_isolation_type_snp(void); 238 239 static inline bool hv_is_synic_reg(unsigned int reg) 240 { 241 return (reg >= HV_REGISTER_SCONTROL) && 242 (reg <= HV_REGISTER_SINT15); 243 } 244 245 static inline bool hv_is_sint_reg(unsigned int reg) 246 { 247 return (reg >= HV_REGISTER_SINT0) && 248 (reg <= HV_REGISTER_SINT15); 249 } 250 251 u64 hv_get_register(unsigned int reg); 252 void hv_set_register(unsigned int reg, u64 value); 253 u64 hv_get_non_nested_register(unsigned int reg); 254 void hv_set_non_nested_register(unsigned int reg, u64 value); 255 256 #else /* CONFIG_HYPERV */ 257 static inline void hyperv_init(void) {} 258 static inline void hyperv_setup_mmu_ops(void) {} 259 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 260 static inline void clear_hv_tscchange_cb(void) {} 261 static inline void hyperv_stop_tsc_emulation(void) {}; 262 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 263 { 264 return NULL; 265 } 266 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 267 static inline int hyperv_flush_guest_mapping_range(u64 as, 268 hyperv_fill_flush_list_func fill_func, void *data) 269 { 270 return -1; 271 } 272 static inline void hv_set_register(unsigned int reg, u64 value) { } 273 static inline u64 hv_get_register(unsigned int reg) { return 0; } 274 static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { } 275 static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; } 276 #endif /* CONFIG_HYPERV */ 277 278 279 #include <asm-generic/mshyperv.h> 280 281 #endif 282