arch/x86/kvm/vmx/evmcs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __KVM_X86_VMX_EVMCS_H
   3 #define __KVM_X86_VMX_EVMCS_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 "capabilities.h"
  12 #include "vmcs.h"
  13 #include "vmcs12.h"
  14
  15 struct vmcs_config;
  16
  17 DECLARE_STATIC_KEY_FALSE(enable_evmcs);
  18
  19 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
  20
  21 #define KVM_EVMCS_VERSION 1
  22
  23 /*
  24  * Enlightened VMCSv1 doesn't support these:
  25  *
  26  *      POSTED_INTR_NV                  = 0x00000002,
  27  *      GUEST_INTR_STATUS               = 0x00000810,
  28  *      APIC_ACCESS_ADDR                = 0x00002014,
  29  *      POSTED_INTR_DESC_ADDR           = 0x00002016,
  30  *      EOI_EXIT_BITMAP0                = 0x0000201c,
  31  *      EOI_EXIT_BITMAP1                = 0x0000201e,
  32  *      EOI_EXIT_BITMAP2                = 0x00002020,
  33  *      EOI_EXIT_BITMAP3                = 0x00002022,
  34  *      GUEST_PML_INDEX                 = 0x00000812,
  35  *      PML_ADDRESS                     = 0x0000200e,
  36  *      VM_FUNCTION_CONTROL             = 0x00002018,
  37  *      EPTP_LIST_ADDRESS               = 0x00002024,
  38  *      VMREAD_BITMAP                   = 0x00002026,
  39  *      VMWRITE_BITMAP                  = 0x00002028,
  40  *
  41  *      TSC_MULTIPLIER                  = 0x00002032,
  42  *      PLE_GAP                         = 0x00004020,
  43  *      PLE_WINDOW                      = 0x00004022,
  44  *      VMX_PREEMPTION_TIMER_VALUE      = 0x0000482E,
  45  *      GUEST_IA32_PERF_GLOBAL_CTRL     = 0x00002808,
  46  *      HOST_IA32_PERF_GLOBAL_CTRL      = 0x00002c04,
  47  *
  48  * Currently unsupported in KVM:
  49  *      GUEST_IA32_RTIT_CTL             = 0x00002814,
  50  */
  51 #define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
  52                                     PIN_BASED_VMX_PREEMPTION_TIMER)
  53 #define EVMCS1_UNSUPPORTED_2NDEXEC                                      \
  54         (SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |                         \
  55          SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |                      \
  56          SECONDARY_EXEC_APIC_REGISTER_VIRT |                            \
  57          SECONDARY_EXEC_ENABLE_PML |                                    \
  58          SECONDARY_EXEC_ENABLE_VMFUNC |                                 \
  59          SECONDARY_EXEC_SHADOW_VMCS |                                   \
  60          SECONDARY_EXEC_TSC_SCALING |                                   \
  61          SECONDARY_EXEC_PAUSE_LOOP_EXITING)
  62 #define EVMCS1_UNSUPPORTED_VMEXIT_CTRL                                  \
  63         (VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL |                           \
  64          VM_EXIT_SAVE_VMX_PREEMPTION_TIMER)
  65 #define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
  66 #define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
  67
  68 struct evmcs_field {
  69         u16 offset;
  70         u16 clean_field;
  71 };
  72
  73 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
  74 extern const unsigned int nr_evmcs_1_fields;
  75
  76 static __always_inline int evmcs_field_offset(unsigned long field,
  77                                               u16 *clean_field)
  78 {
  79         unsigned int index = ROL16(field, 6);
  80         const struct evmcs_field *evmcs_field;
  81
  82         if (unlikely(index >= nr_evmcs_1_fields))
  83                 return -ENOENT;
  84
  85         evmcs_field = &vmcs_field_to_evmcs_1[index];
  86
  87         /*
  88          * Use offset=0 to detect holes in eVMCS. This offset belongs to
  89          * 'revision_id' but this field has no encoding and is supposed to
  90          * be accessed directly.
  91          */
  92         if (unlikely(!evmcs_field->offset))
  93                 return -ENOENT;
  94
  95         if (clean_field)
  96                 *clean_field = evmcs_field->clean_field;
  97
  98         return evmcs_field->offset;
  99 }
 100
 101 static inline u64 evmcs_read_any(struct hv_enlightened_vmcs *evmcs,
 102                                  unsigned long field, u16 offset)
 103 {
 104         /*
 105          * vmcs12_read_any() doesn't care whether the supplied structure
 106          * is 'struct vmcs12' or 'struct hv_enlightened_vmcs' as it takes
 107          * the exact offset of the required field, use it for convenience
 108          * here.
 109          */
 110         return vmcs12_read_any((void *)evmcs, field, offset);
 111 }
 112
 113 #if IS_ENABLED(CONFIG_HYPERV)
 114
 115 static __always_inline int get_evmcs_offset(unsigned long field,
 116                                             u16 *clean_field)
 117 {
 118         int offset = evmcs_field_offset(field, clean_field);
 119
 120         WARN_ONCE(offset < 0, "KVM: accessing unsupported EVMCS field %lx\n",
 121                   field);
 122
 123         return offset;
 124 }
 125
 126 static __always_inline void evmcs_write64(unsigned long field, u64 value)
 127 {
 128         u16 clean_field;
 129         int offset = get_evmcs_offset(field, &clean_field);
 130
 131         if (offset < 0)
 132                 return;
 133
 134         *(u64 *)((char *)current_evmcs + offset) = value;
 135
 136         current_evmcs->hv_clean_fields &= ~clean_field;
 137 }
 138
 139 static inline void evmcs_write32(unsigned long field, u32 value)
 140 {
 141         u16 clean_field;
 142         int offset = get_evmcs_offset(field, &clean_field);
 143
 144         if (offset < 0)
 145                 return;
 146
 147         *(u32 *)((char *)current_evmcs + offset) = value;
 148         current_evmcs->hv_clean_fields &= ~clean_field;
 149 }
 150
 151 static inline void evmcs_write16(unsigned long field, u16 value)
 152 {
 153         u16 clean_field;
 154         int offset = get_evmcs_offset(field, &clean_field);
 155
 156         if (offset < 0)
 157                 return;
 158
 159         *(u16 *)((char *)current_evmcs + offset) = value;
 160         current_evmcs->hv_clean_fields &= ~clean_field;
 161 }
 162
 163 static inline u64 evmcs_read64(unsigned long field)
 164 {
 165         int offset = get_evmcs_offset(field, NULL);
 166
 167         if (offset < 0)
 168                 return 0;
 169
 170         return *(u64 *)((char *)current_evmcs + offset);
 171 }
 172
 173 static inline u32 evmcs_read32(unsigned long field)
 174 {
 175         int offset = get_evmcs_offset(field, NULL);
 176
 177         if (offset < 0)
 178                 return 0;
 179
 180         return *(u32 *)((char *)current_evmcs + offset);
 181 }
 182
 183 static inline u16 evmcs_read16(unsigned long field)
 184 {
 185         int offset = get_evmcs_offset(field, NULL);
 186
 187         if (offset < 0)
 188                 return 0;
 189
 190         return *(u16 *)((char *)current_evmcs + offset);
 191 }
 192
 193 static inline void evmcs_touch_msr_bitmap(void)
 194 {
 195         if (unlikely(!current_evmcs))
 196                 return;
 197
 198         if (current_evmcs->hv_enlightenments_control.msr_bitmap)
 199                 current_evmcs->hv_clean_fields &=
 200                         ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
 201 }
 202
 203 static inline void evmcs_load(u64 phys_addr)
 204 {
 205         struct hv_vp_assist_page *vp_ap =
 206                 hv_get_vp_assist_page(smp_processor_id());
 207
 208         if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
 209                 vp_ap->nested_control.features.directhypercall = 1;
 210         vp_ap->current_nested_vmcs = phys_addr;
 211         vp_ap->enlighten_vmentry = 1;
 212 }
 213
 214 __init void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
 215 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 216 static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
 217 static inline void evmcs_write32(unsigned long field, u32 value) {}
 218 static inline void evmcs_write16(unsigned long field, u16 value) {}
 219 static inline u64 evmcs_read64(unsigned long field) { return 0; }
 220 static inline u32 evmcs_read32(unsigned long field) { return 0; }
 221 static inline u16 evmcs_read16(unsigned long field) { return 0; }
 222 static inline void evmcs_load(u64 phys_addr) {}
 223 static inline void evmcs_touch_msr_bitmap(void) {}
 224 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 225
 226 #define EVMPTR_INVALID (-1ULL)
 227 #define EVMPTR_MAP_PENDING (-2ULL)
 228
 229 static inline bool evmptr_is_valid(u64 evmptr)
 230 {
 231         return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
 232 }
 233
 234 enum nested_evmptrld_status {
 235         EVMPTRLD_DISABLED,
 236         EVMPTRLD_SUCCEEDED,
 237         EVMPTRLD_VMFAIL,
 238         EVMPTRLD_ERROR,
 239 };
 240
 241 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
 242 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
 243 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
 244                         uint16_t *vmcs_version);
 245 void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata);
 246 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
 247
 248 #endif /* __KVM_X86_VMX_EVMCS_H */