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 union hv_ghcb; 15 16 DECLARE_STATIC_KEY_FALSE(isolation_type_snp); 17 18 typedef int (*hyperv_fill_flush_list_func)( 19 struct hv_guest_mapping_flush_list *flush, 20 void *data); 21 22 #define hv_get_raw_timer() rdtsc_ordered() 23 24 void hyperv_vector_handler(struct pt_regs *regs); 25 26 #if IS_ENABLED(CONFIG_HYPERV) 27 extern int hyperv_init_cpuhp; 28 29 extern void *hv_hypercall_pg; 30 31 extern u64 hv_current_partition_id; 32 33 extern union hv_ghcb * __percpu *hv_ghcb_pg; 34 35 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); 36 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); 37 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); 38 39 static inline u64 hv_do_hypercall(u64 control, void *input, void *output) 40 { 41 u64 input_address = input ? virt_to_phys(input) : 0; 42 u64 output_address = output ? virt_to_phys(output) : 0; 43 u64 hv_status; 44 45 #ifdef CONFIG_X86_64 46 if (!hv_hypercall_pg) 47 return U64_MAX; 48 49 __asm__ __volatile__("mov %4, %%r8\n" 50 CALL_NOSPEC 51 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 52 "+c" (control), "+d" (input_address) 53 : "r" (output_address), 54 THUNK_TARGET(hv_hypercall_pg) 55 : "cc", "memory", "r8", "r9", "r10", "r11"); 56 #else 57 u32 input_address_hi = upper_32_bits(input_address); 58 u32 input_address_lo = lower_32_bits(input_address); 59 u32 output_address_hi = upper_32_bits(output_address); 60 u32 output_address_lo = lower_32_bits(output_address); 61 62 if (!hv_hypercall_pg) 63 return U64_MAX; 64 65 __asm__ __volatile__(CALL_NOSPEC 66 : "=A" (hv_status), 67 "+c" (input_address_lo), ASM_CALL_CONSTRAINT 68 : "A" (control), 69 "b" (input_address_hi), 70 "D"(output_address_hi), "S"(output_address_lo), 71 THUNK_TARGET(hv_hypercall_pg) 72 : "cc", "memory"); 73 #endif /* !x86_64 */ 74 return hv_status; 75 } 76 77 /* Fast hypercall with 8 bytes of input and no output */ 78 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) 79 { 80 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; 81 82 #ifdef CONFIG_X86_64 83 { 84 __asm__ __volatile__(CALL_NOSPEC 85 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 86 "+c" (control), "+d" (input1) 87 : THUNK_TARGET(hv_hypercall_pg) 88 : "cc", "r8", "r9", "r10", "r11"); 89 } 90 #else 91 { 92 u32 input1_hi = upper_32_bits(input1); 93 u32 input1_lo = lower_32_bits(input1); 94 95 __asm__ __volatile__ (CALL_NOSPEC 96 : "=A"(hv_status), 97 "+c"(input1_lo), 98 ASM_CALL_CONSTRAINT 99 : "A" (control), 100 "b" (input1_hi), 101 THUNK_TARGET(hv_hypercall_pg) 102 : "cc", "edi", "esi"); 103 } 104 #endif 105 return hv_status; 106 } 107 108 /* Fast hypercall with 16 bytes of input */ 109 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2) 110 { 111 u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT; 112 113 #ifdef CONFIG_X86_64 114 { 115 __asm__ __volatile__("mov %4, %%r8\n" 116 CALL_NOSPEC 117 : "=a" (hv_status), ASM_CALL_CONSTRAINT, 118 "+c" (control), "+d" (input1) 119 : "r" (input2), 120 THUNK_TARGET(hv_hypercall_pg) 121 : "cc", "r8", "r9", "r10", "r11"); 122 } 123 #else 124 { 125 u32 input1_hi = upper_32_bits(input1); 126 u32 input1_lo = lower_32_bits(input1); 127 u32 input2_hi = upper_32_bits(input2); 128 u32 input2_lo = lower_32_bits(input2); 129 130 __asm__ __volatile__ (CALL_NOSPEC 131 : "=A"(hv_status), 132 "+c"(input1_lo), ASM_CALL_CONSTRAINT 133 : "A" (control), "b" (input1_hi), 134 "D"(input2_hi), "S"(input2_lo), 135 THUNK_TARGET(hv_hypercall_pg) 136 : "cc"); 137 } 138 #endif 139 return hv_status; 140 } 141 142 extern struct hv_vp_assist_page **hv_vp_assist_page; 143 144 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 145 { 146 if (!hv_vp_assist_page) 147 return NULL; 148 149 return hv_vp_assist_page[cpu]; 150 } 151 152 void __init hyperv_init(void); 153 void hyperv_setup_mmu_ops(void); 154 void set_hv_tscchange_cb(void (*cb)(void)); 155 void clear_hv_tscchange_cb(void); 156 void hyperv_stop_tsc_emulation(void); 157 int hyperv_flush_guest_mapping(u64 as); 158 int hyperv_flush_guest_mapping_range(u64 as, 159 hyperv_fill_flush_list_func fill_func, void *data); 160 int hyperv_fill_flush_guest_mapping_list( 161 struct hv_guest_mapping_flush_list *flush, 162 u64 start_gfn, u64 end_gfn); 163 164 #ifdef CONFIG_X86_64 165 void hv_apic_init(void); 166 void __init hv_init_spinlocks(void); 167 bool hv_vcpu_is_preempted(int vcpu); 168 #else 169 static inline void hv_apic_init(void) {} 170 #endif 171 172 struct irq_domain *hv_create_pci_msi_domain(void); 173 174 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector, 175 struct hv_interrupt_entry *entry); 176 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry); 177 int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible); 178 179 #ifdef CONFIG_AMD_MEM_ENCRYPT 180 void hv_ghcb_msr_write(u64 msr, u64 value); 181 void hv_ghcb_msr_read(u64 msr, u64 *value); 182 #else 183 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {} 184 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} 185 #endif 186 187 extern bool hv_isolation_type_snp(void); 188 189 static inline bool hv_is_synic_reg(unsigned int reg) 190 { 191 if ((reg >= HV_REGISTER_SCONTROL) && 192 (reg <= HV_REGISTER_SINT15)) 193 return true; 194 return false; 195 } 196 197 static inline u64 hv_get_register(unsigned int reg) 198 { 199 u64 value; 200 201 if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) 202 hv_ghcb_msr_read(reg, &value); 203 else 204 rdmsrl(reg, value); 205 return value; 206 } 207 208 static inline void hv_set_register(unsigned int reg, u64 value) 209 { 210 if (hv_is_synic_reg(reg) && hv_isolation_type_snp()) { 211 hv_ghcb_msr_write(reg, value); 212 213 /* Write proxy bit via wrmsl instruction */ 214 if (reg >= HV_REGISTER_SINT0 && 215 reg <= HV_REGISTER_SINT15) 216 wrmsrl(reg, value | 1 << 20); 217 } else { 218 wrmsrl(reg, value); 219 } 220 } 221 222 #else /* CONFIG_HYPERV */ 223 static inline void hyperv_init(void) {} 224 static inline void hyperv_setup_mmu_ops(void) {} 225 static inline void set_hv_tscchange_cb(void (*cb)(void)) {} 226 static inline void clear_hv_tscchange_cb(void) {} 227 static inline void hyperv_stop_tsc_emulation(void) {}; 228 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) 229 { 230 return NULL; 231 } 232 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; } 233 static inline int hyperv_flush_guest_mapping_range(u64 as, 234 hyperv_fill_flush_list_func fill_func, void *data) 235 { 236 return -1; 237 } 238 static inline void hv_set_register(unsigned int reg, u64 value) { } 239 static inline u64 hv_get_register(unsigned int reg) { return 0; } 240 static inline int hv_set_mem_host_visibility(unsigned long addr, int numpages, 241 bool visible) 242 { 243 return -1; 244 } 245 #endif /* CONFIG_HYPERV */ 246 247 248 #include <asm-generic/mshyperv.h> 249 250 #endif 251