arch/x86/include/asm/mshyperv.h

   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/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
  30 typedef int (*hyperv_fill_flush_list_func)(
  31                 struct hv_guest_mapping_flush_list *flush,
  32                 void *data);
  33
  34 void hyperv_vector_handler(struct pt_regs *regs);
  35
  36 static inline unsigned char hv_get_nmi_reason(void)
  37 {
  38         return 0;
  39 }
  40
  41 #if IS_ENABLED(CONFIG_HYPERV)
  42 extern int hyperv_init_cpuhp;
  43
  44 extern void *hv_hypercall_pg;
  45
  46 extern u64 hv_current_partition_id;
  47
  48 extern union hv_ghcb * __percpu *hv_ghcb_pg;
  49
  50 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
  51 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
  52 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
  53
  54 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
  55 {
  56         u64 input_address = input ? virt_to_phys(input) : 0;
  57         u64 output_address = output ? virt_to_phys(output) : 0;
  58         u64 hv_status;
  59
  60 #ifdef CONFIG_X86_64
  61         if (!hv_hypercall_pg)
  62                 return U64_MAX;
  63
  64         __asm__ __volatile__("mov %4, %%r8\n"
  65                              CALL_NOSPEC
  66                              : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  67                                "+c" (control), "+d" (input_address)
  68                              :  "r" (output_address),
  69                                 THUNK_TARGET(hv_hypercall_pg)
  70                              : "cc", "memory", "r8", "r9", "r10", "r11");
  71 #else
  72         u32 input_address_hi = upper_32_bits(input_address);
  73         u32 input_address_lo = lower_32_bits(input_address);
  74         u32 output_address_hi = upper_32_bits(output_address);
  75         u32 output_address_lo = lower_32_bits(output_address);
  76
  77         if (!hv_hypercall_pg)
  78                 return U64_MAX;
  79
  80         __asm__ __volatile__(CALL_NOSPEC
  81                              : "=A" (hv_status),
  82                                "+c" (input_address_lo), ASM_CALL_CONSTRAINT
  83                              : "A" (control),
  84                                "b" (input_address_hi),
  85                                "D"(output_address_hi), "S"(output_address_lo),
  86                                THUNK_TARGET(hv_hypercall_pg)
  87                              : "cc", "memory");
  88 #endif /* !x86_64 */
  89         return hv_status;
  90 }
  91
  92 /* Hypercall to the L0 hypervisor */
  93 static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
  94 {
  95         return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
  96 }
  97
  98 /* Fast hypercall with 8 bytes of input and no output */
  99 static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
 100 {
 101         u64 hv_status;
 102
 103 #ifdef CONFIG_X86_64
 104         {
 105                 __asm__ __volatile__(CALL_NOSPEC
 106                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 107                                        "+c" (control), "+d" (input1)
 108                                      : THUNK_TARGET(hv_hypercall_pg)
 109                                      : "cc", "r8", "r9", "r10", "r11");
 110         }
 111 #else
 112         {
 113                 u32 input1_hi = upper_32_bits(input1);
 114                 u32 input1_lo = lower_32_bits(input1);
 115
 116                 __asm__ __volatile__ (CALL_NOSPEC
 117                                       : "=A"(hv_status),
 118                                         "+c"(input1_lo),
 119                                         ASM_CALL_CONSTRAINT
 120                                       : "A" (control),
 121                                         "b" (input1_hi),
 122                                         THUNK_TARGET(hv_hypercall_pg)
 123                                       : "cc", "edi", "esi");
 124         }
 125 #endif
 126                 return hv_status;
 127 }
 128
 129 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
 130 {
 131         u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
 132
 133         return _hv_do_fast_hypercall8(control, input1);
 134 }
 135
 136 static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
 137 {
 138         u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
 139
 140         return _hv_do_fast_hypercall8(control, input1);
 141 }
 142
 143 /* Fast hypercall with 16 bytes of input */
 144 static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
 145 {
 146         u64 hv_status;
 147
 148 #ifdef CONFIG_X86_64
 149         {
 150                 __asm__ __volatile__("mov %4, %%r8\n"
 151                                      CALL_NOSPEC
 152                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 153                                        "+c" (control), "+d" (input1)
 154                                      : "r" (input2),
 155                                        THUNK_TARGET(hv_hypercall_pg)
 156                                      : "cc", "r8", "r9", "r10", "r11");
 157         }
 158 #else
 159         {
 160                 u32 input1_hi = upper_32_bits(input1);
 161                 u32 input1_lo = lower_32_bits(input1);
 162                 u32 input2_hi = upper_32_bits(input2);
 163                 u32 input2_lo = lower_32_bits(input2);
 164
 165                 __asm__ __volatile__ (CALL_NOSPEC
 166                                       : "=A"(hv_status),
 167                                         "+c"(input1_lo), ASM_CALL_CONSTRAINT
 168                                       : "A" (control), "b" (input1_hi),
 169                                         "D"(input2_hi), "S"(input2_lo),
 170                                         THUNK_TARGET(hv_hypercall_pg)
 171                                       : "cc");
 172         }
 173 #endif
 174         return hv_status;
 175 }
 176
 177 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
 178 {
 179         u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
 180
 181         return _hv_do_fast_hypercall16(control, input1, input2);
 182 }
 183
 184 static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
 185 {
 186         u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
 187
 188         return _hv_do_fast_hypercall16(control, input1, input2);
 189 }
 190
 191 extern struct hv_vp_assist_page **hv_vp_assist_page;
 192
 193 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 194 {
 195         if (!hv_vp_assist_page)
 196                 return NULL;
 197
 198         return hv_vp_assist_page[cpu];
 199 }
 200
 201 void __init hyperv_init(void);
 202 void hyperv_setup_mmu_ops(void);
 203 void set_hv_tscchange_cb(void (*cb)(void));
 204 void clear_hv_tscchange_cb(void);
 205 void hyperv_stop_tsc_emulation(void);
 206 int hyperv_flush_guest_mapping(u64 as);
 207 int hyperv_flush_guest_mapping_range(u64 as,
 208                 hyperv_fill_flush_list_func fill_func, void *data);
 209 int hyperv_fill_flush_guest_mapping_list(
 210                 struct hv_guest_mapping_flush_list *flush,
 211                 u64 start_gfn, u64 end_gfn);
 212
 213 #ifdef CONFIG_X86_64
 214 void hv_apic_init(void);
 215 void __init hv_init_spinlocks(void);
 216 bool hv_vcpu_is_preempted(int vcpu);
 217 #else
 218 static inline void hv_apic_init(void) {}
 219 #endif
 220
 221 struct irq_domain *hv_create_pci_msi_domain(void);
 222
 223 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
 224                 struct hv_interrupt_entry *entry);
 225 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
 226
 227 #ifdef CONFIG_AMD_MEM_ENCRYPT
 228 void hv_ghcb_msr_write(u64 msr, u64 value);
 229 void hv_ghcb_msr_read(u64 msr, u64 *value);
 230 bool hv_ghcb_negotiate_protocol(void);
 231 void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
 232 void hv_vtom_init(void);
 233 #else
 234 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {}
 235 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {}
 236 static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
 237 static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
 238 static inline void hv_vtom_init(void) {}
 239 #endif
 240
 241 extern bool hv_isolation_type_snp(void);
 242
 243 static inline bool hv_is_synic_reg(unsigned int reg)
 244 {
 245         return (reg >= HV_REGISTER_SCONTROL) &&
 246                (reg <= HV_REGISTER_SINT15);
 247 }
 248
 249 static inline bool hv_is_sint_reg(unsigned int reg)
 250 {
 251         return (reg >= HV_REGISTER_SINT0) &&
 252                (reg <= HV_REGISTER_SINT15);
 253 }
 254
 255 u64 hv_get_register(unsigned int reg);
 256 void hv_set_register(unsigned int reg, u64 value);
 257 u64 hv_get_non_nested_register(unsigned int reg);
 258 void hv_set_non_nested_register(unsigned int reg, u64 value);
 259
 260 static __always_inline u64 hv_raw_get_register(unsigned int reg)
 261 {
 262         return __rdmsr(reg);
 263 }
 264
 265 #else /* CONFIG_HYPERV */
 266 static inline void hyperv_init(void) {}
 267 static inline void hyperv_setup_mmu_ops(void) {}
 268 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
 269 static inline void clear_hv_tscchange_cb(void) {}
 270 static inline void hyperv_stop_tsc_emulation(void) {};
 271 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 272 {
 273         return NULL;
 274 }
 275 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
 276 static inline int hyperv_flush_guest_mapping_range(u64 as,
 277                 hyperv_fill_flush_list_func fill_func, void *data)
 278 {
 279         return -1;
 280 }
 281 static inline void hv_set_register(unsigned int reg, u64 value) { }
 282 static inline u64 hv_get_register(unsigned int reg) { return 0; }
 283 static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
 284 static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
 285 #endif /* CONFIG_HYPERV */
 286
 287
 288 #ifdef CONFIG_HYPERV_VTL_MODE
 289 void __init hv_vtl_init_platform(void);
 290 #else
 291 static inline void __init hv_vtl_init_platform(void) {}
 292 #endif
 293
 294 #include <asm-generic/mshyperv.h>
 295
 296 #endif