arch/x86/kvm/vmx/hyperv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __KVM_X86_VMX_HYPERV_H
   3 #define __KVM_X86_VMX_HYPERV_H
   4
   5 #include <linux/jump_label.h>
   6
   7 #include <asm/hyperv-tlfs.h>
   8 #include <asm/mshyperv.h>
   9 #include <asm/vmx.h>
  10
  11 #include "../hyperv.h"
  12
  13 #include "capabilities.h"
  14 #include "vmcs.h"
  15 #include "vmcs12.h"
  16
  17 struct vmcs_config;
  18
  19 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
  20
  21 #define KVM_EVMCS_VERSION 1
  22
  23 struct evmcs_field {
  24         u16 offset;
  25         u16 clean_field;
  26 };
  27
  28 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
  29 extern const unsigned int nr_evmcs_1_fields;
  30
  31 static __always_inline int evmcs_field_offset(unsigned long field,
  32                                               u16 *clean_field)
  33 {
  34         unsigned int index = ROL16(field, 6);
  35         const struct evmcs_field *evmcs_field;
  36
  37         if (unlikely(index >= nr_evmcs_1_fields))
  38                 return -ENOENT;
  39
  40         evmcs_field = &vmcs_field_to_evmcs_1[index];
  41
  42         /*
  43          * Use offset=0 to detect holes in eVMCS. This offset belongs to
  44          * 'revision_id' but this field has no encoding and is supposed to
  45          * be accessed directly.
  46          */
  47         if (unlikely(!evmcs_field->offset))
  48                 return -ENOENT;
  49
  50         if (clean_field)
  51                 *clean_field = evmcs_field->clean_field;
  52
  53         return evmcs_field->offset;
  54 }
  55
  56 static inline u64 evmcs_read_any(struct hv_enlightened_vmcs *evmcs,
  57                                  unsigned long field, u16 offset)
  58 {
  59         /*
  60          * vmcs12_read_any() doesn't care whether the supplied structure
  61          * is 'struct vmcs12' or 'struct hv_enlightened_vmcs' as it takes
  62          * the exact offset of the required field, use it for convenience
  63          * here.
  64          */
  65         return vmcs12_read_any((void *)evmcs, field, offset);
  66 }
  67
  68 #if IS_ENABLED(CONFIG_HYPERV)
  69
  70 DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
  71
  72 static __always_inline bool kvm_is_using_evmcs(void)
  73 {
  74         return static_branch_unlikely(&__kvm_is_using_evmcs);
  75 }
  76
  77 static __always_inline int get_evmcs_offset(unsigned long field,
  78                                             u16 *clean_field)
  79 {
  80         int offset = evmcs_field_offset(field, clean_field);
  81
  82         WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
  83         return offset;
  84 }
  85
  86 static __always_inline void evmcs_write64(unsigned long field, u64 value)
  87 {
  88         u16 clean_field;
  89         int offset = get_evmcs_offset(field, &clean_field);
  90
  91         if (offset < 0)
  92                 return;
  93
  94         *(u64 *)((char *)current_evmcs + offset) = value;
  95
  96         current_evmcs->hv_clean_fields &= ~clean_field;
  97 }
  98
  99 static __always_inline void evmcs_write32(unsigned long field, u32 value)
 100 {
 101         u16 clean_field;
 102         int offset = get_evmcs_offset(field, &clean_field);
 103
 104         if (offset < 0)
 105                 return;
 106
 107         *(u32 *)((char *)current_evmcs + offset) = value;
 108         current_evmcs->hv_clean_fields &= ~clean_field;
 109 }
 110
 111 static __always_inline void evmcs_write16(unsigned long field, u16 value)
 112 {
 113         u16 clean_field;
 114         int offset = get_evmcs_offset(field, &clean_field);
 115
 116         if (offset < 0)
 117                 return;
 118
 119         *(u16 *)((char *)current_evmcs + offset) = value;
 120         current_evmcs->hv_clean_fields &= ~clean_field;
 121 }
 122
 123 static __always_inline u64 evmcs_read64(unsigned long field)
 124 {
 125         int offset = get_evmcs_offset(field, NULL);
 126
 127         if (offset < 0)
 128                 return 0;
 129
 130         return *(u64 *)((char *)current_evmcs + offset);
 131 }
 132
 133 static __always_inline u32 evmcs_read32(unsigned long field)
 134 {
 135         int offset = get_evmcs_offset(field, NULL);
 136
 137         if (offset < 0)
 138                 return 0;
 139
 140         return *(u32 *)((char *)current_evmcs + offset);
 141 }
 142
 143 static __always_inline u16 evmcs_read16(unsigned long field)
 144 {
 145         int offset = get_evmcs_offset(field, NULL);
 146
 147         if (offset < 0)
 148                 return 0;
 149
 150         return *(u16 *)((char *)current_evmcs + offset);
 151 }
 152
 153 static inline void evmcs_load(u64 phys_addr)
 154 {
 155         struct hv_vp_assist_page *vp_ap =
 156                 hv_get_vp_assist_page(smp_processor_id());
 157
 158         if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
 159                 vp_ap->nested_control.features.directhypercall = 1;
 160         vp_ap->current_nested_vmcs = phys_addr;
 161         vp_ap->enlighten_vmentry = 1;
 162 }
 163
 164 void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
 165 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 166 static __always_inline bool kvm_is_using_evmcs(void) { return false; }
 167 static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
 168 static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
 169 static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
 170 static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
 171 static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
 172 static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
 173 static inline void evmcs_load(u64 phys_addr) {}
 174 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 175
 176 #define EVMPTR_INVALID (-1ULL)
 177 #define EVMPTR_MAP_PENDING (-2ULL)
 178
 179 static inline bool evmptr_is_valid(u64 evmptr)
 180 {
 181         return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
 182 }
 183
 184 enum nested_evmptrld_status {
 185         EVMPTRLD_DISABLED,
 186         EVMPTRLD_SUCCEEDED,
 187         EVMPTRLD_VMFAIL,
 188         EVMPTRLD_ERROR,
 189 };
 190
 191 u64 nested_get_evmptr(struct kvm_vcpu *vcpu);
 192 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
 193 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
 194                         uint16_t *vmcs_version);
 195 void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 196 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
 197 bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu);
 198 void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu);
 199
 200 #endif /* __KVM_X86_VMX_HYPERV_H */