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 <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 typedef int (*hyperv_fill_flush_list_func)(
  15                 struct hv_guest_mapping_flush_list *flush,
  16                 void *data);
  17
  18 static inline void hv_set_register(unsigned int reg, u64 value)
  19 {
  20         wrmsrl(reg, value);
  21 }
  22
  23 static inline u64 hv_get_register(unsigned int reg)
  24 {
  25         u64 value;
  26
  27         rdmsrl(reg, value);
  28         return value;
  29 }
  30
  31 #define hv_get_raw_timer() rdtsc_ordered()
  32
  33 void hyperv_vector_handler(struct pt_regs *regs);
  34
  35 #if IS_ENABLED(CONFIG_HYPERV)
  36 extern int hyperv_init_cpuhp;
  37
  38 extern void *hv_hypercall_pg;
  39 extern void  __percpu  **hyperv_pcpu_input_arg;
  40 extern void  __percpu  **hyperv_pcpu_output_arg;
  41
  42 extern u64 hv_current_partition_id;
  43
  44 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
  45 int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
  46 int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
  47
  48 static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
  49 {
  50         u64 input_address = input ? virt_to_phys(input) : 0;
  51         u64 output_address = output ? virt_to_phys(output) : 0;
  52         u64 hv_status;
  53
  54 #ifdef CONFIG_X86_64
  55         if (!hv_hypercall_pg)
  56                 return U64_MAX;
  57
  58         __asm__ __volatile__("mov %4, %%r8\n"
  59                              CALL_NOSPEC
  60                              : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  61                                "+c" (control), "+d" (input_address)
  62                              :  "r" (output_address),
  63                                 THUNK_TARGET(hv_hypercall_pg)
  64                              : "cc", "memory", "r8", "r9", "r10", "r11");
  65 #else
  66         u32 input_address_hi = upper_32_bits(input_address);
  67         u32 input_address_lo = lower_32_bits(input_address);
  68         u32 output_address_hi = upper_32_bits(output_address);
  69         u32 output_address_lo = lower_32_bits(output_address);
  70
  71         if (!hv_hypercall_pg)
  72                 return U64_MAX;
  73
  74         __asm__ __volatile__(CALL_NOSPEC
  75                              : "=A" (hv_status),
  76                                "+c" (input_address_lo), ASM_CALL_CONSTRAINT
  77                              : "A" (control),
  78                                "b" (input_address_hi),
  79                                "D"(output_address_hi), "S"(output_address_lo),
  80                                THUNK_TARGET(hv_hypercall_pg)
  81                              : "cc", "memory");
  82 #endif /* !x86_64 */
  83         return hv_status;
  84 }
  85
  86 /* Fast hypercall with 8 bytes of input and no output */
  87 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
  88 {
  89         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
  90
  91 #ifdef CONFIG_X86_64
  92         {
  93                 __asm__ __volatile__(CALL_NOSPEC
  94                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
  95                                        "+c" (control), "+d" (input1)
  96                                      : THUNK_TARGET(hv_hypercall_pg)
  97                                      : "cc", "r8", "r9", "r10", "r11");
  98         }
  99 #else
 100         {
 101                 u32 input1_hi = upper_32_bits(input1);
 102                 u32 input1_lo = lower_32_bits(input1);
 103
 104                 __asm__ __volatile__ (CALL_NOSPEC
 105                                       : "=A"(hv_status),
 106                                         "+c"(input1_lo),
 107                                         ASM_CALL_CONSTRAINT
 108                                       : "A" (control),
 109                                         "b" (input1_hi),
 110                                         THUNK_TARGET(hv_hypercall_pg)
 111                                       : "cc", "edi", "esi");
 112         }
 113 #endif
 114                 return hv_status;
 115 }
 116
 117 /* Fast hypercall with 16 bytes of input */
 118 static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
 119 {
 120         u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
 121
 122 #ifdef CONFIG_X86_64
 123         {
 124                 __asm__ __volatile__("mov %4, %%r8\n"
 125                                      CALL_NOSPEC
 126                                      : "=a" (hv_status), ASM_CALL_CONSTRAINT,
 127                                        "+c" (control), "+d" (input1)
 128                                      : "r" (input2),
 129                                        THUNK_TARGET(hv_hypercall_pg)
 130                                      : "cc", "r8", "r9", "r10", "r11");
 131         }
 132 #else
 133         {
 134                 u32 input1_hi = upper_32_bits(input1);
 135                 u32 input1_lo = lower_32_bits(input1);
 136                 u32 input2_hi = upper_32_bits(input2);
 137                 u32 input2_lo = lower_32_bits(input2);
 138
 139                 __asm__ __volatile__ (CALL_NOSPEC
 140                                       : "=A"(hv_status),
 141                                         "+c"(input1_lo), ASM_CALL_CONSTRAINT
 142                                       : "A" (control), "b" (input1_hi),
 143                                         "D"(input2_hi), "S"(input2_lo),
 144                                         THUNK_TARGET(hv_hypercall_pg)
 145                                       : "cc");
 146         }
 147 #endif
 148         return hv_status;
 149 }
 150
 151 extern struct hv_vp_assist_page **hv_vp_assist_page;
 152
 153 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 154 {
 155         if (!hv_vp_assist_page)
 156                 return NULL;
 157
 158         return hv_vp_assist_page[cpu];
 159 }
 160
 161 void __init hyperv_init(void);
 162 void hyperv_setup_mmu_ops(void);
 163 void set_hv_tscchange_cb(void (*cb)(void));
 164 void clear_hv_tscchange_cb(void);
 165 void hyperv_stop_tsc_emulation(void);
 166 int hyperv_flush_guest_mapping(u64 as);
 167 int hyperv_flush_guest_mapping_range(u64 as,
 168                 hyperv_fill_flush_list_func fill_func, void *data);
 169 int hyperv_fill_flush_guest_mapping_list(
 170                 struct hv_guest_mapping_flush_list *flush,
 171                 u64 start_gfn, u64 end_gfn);
 172
 173 extern bool hv_root_partition;
 174
 175 #ifdef CONFIG_X86_64
 176 void hv_apic_init(void);
 177 void __init hv_init_spinlocks(void);
 178 bool hv_vcpu_is_preempted(int vcpu);
 179 #else
 180 static inline void hv_apic_init(void) {}
 181 #endif
 182
 183 static inline void hv_set_msi_entry_from_desc(union hv_msi_entry *msi_entry,
 184                                               struct msi_desc *msi_desc)
 185 {
 186         msi_entry->address.as_uint32 = msi_desc->msg.address_lo;
 187         msi_entry->data.as_uint32 = msi_desc->msg.data;
 188 }
 189
 190 struct irq_domain *hv_create_pci_msi_domain(void);
 191
 192 int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
 193                 struct hv_interrupt_entry *entry);
 194 int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
 195
 196 #else /* CONFIG_HYPERV */
 197 static inline void hyperv_init(void) {}
 198 static inline void hyperv_setup_mmu_ops(void) {}
 199 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
 200 static inline void clear_hv_tscchange_cb(void) {}
 201 static inline void hyperv_stop_tsc_emulation(void) {};
 202 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 203 {
 204         return NULL;
 205 }
 206 static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
 207 static inline int hyperv_flush_guest_mapping_range(u64 as,
 208                 hyperv_fill_flush_list_func fill_func, void *data)
 209 {
 210         return -1;
 211 }
 212 #endif /* CONFIG_HYPERV */
 213
 214
 215 #include <asm-generic/mshyperv.h>
 216
 217 #endif