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  *
  46  * Currently unsupported in KVM:
  47  *      GUEST_IA32_RTIT_CTL             = 0x00002814,
  48  */
  49 #define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
  50                                     PIN_BASED_VMX_PREEMPTION_TIMER)
  51 #define EVMCS1_UNSUPPORTED_EXEC_CTRL (CPU_BASED_ACTIVATE_TERTIARY_CONTROLS)
  52 #define EVMCS1_UNSUPPORTED_2NDEXEC                                      \
  53         (SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |                         \
  54          SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |                      \
  55          SECONDARY_EXEC_APIC_REGISTER_VIRT |                            \
  56          SECONDARY_EXEC_ENABLE_PML |                                    \
  57          SECONDARY_EXEC_ENABLE_VMFUNC |                                 \
  58          SECONDARY_EXEC_SHADOW_VMCS |                                   \
  59          SECONDARY_EXEC_TSC_SCALING |                                   \
  60          SECONDARY_EXEC_PAUSE_LOOP_EXITING)
  61 #define EVMCS1_UNSUPPORTED_VMEXIT_CTRL                                  \
  62         (VM_EXIT_SAVE_VMX_PREEMPTION_TIMER)
  63 #define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (0)
  64 #define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
  65
  66 struct evmcs_field {
  67         u16 offset;
  68         u16 clean_field;
  69 };
  70
  71 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
  72 extern const unsigned int nr_evmcs_1_fields;
  73
  74 static __always_inline int evmcs_field_offset(unsigned long field,
  75                                               u16 *clean_field)
  76 {
  77         unsigned int index = ROL16(field, 6);
  78         const struct evmcs_field *evmcs_field;
  79
  80         if (unlikely(index >= nr_evmcs_1_fields))
  81                 return -ENOENT;
  82
  83         evmcs_field = &vmcs_field_to_evmcs_1[index];
  84
  85         /*
  86          * Use offset=0 to detect holes in eVMCS. This offset belongs to
  87          * 'revision_id' but this field has no encoding and is supposed to
  88          * be accessed directly.
  89          */
  90         if (unlikely(!evmcs_field->offset))
  91                 return -ENOENT;
  92
  93         if (clean_field)
  94                 *clean_field = evmcs_field->clean_field;
  95
  96         return evmcs_field->offset;
  97 }
  98
  99 static inline u64 evmcs_read_any(struct hv_enlightened_vmcs *evmcs,
 100                                  unsigned long field, u16 offset)
 101 {
 102         /*
 103          * vmcs12_read_any() doesn't care whether the supplied structure
 104          * is 'struct vmcs12' or 'struct hv_enlightened_vmcs' as it takes
 105          * the exact offset of the required field, use it for convenience
 106          * here.
 107          */
 108         return vmcs12_read_any((void *)evmcs, field, offset);
 109 }
 110
 111 #if IS_ENABLED(CONFIG_HYPERV)
 112
 113 static __always_inline int get_evmcs_offset(unsigned long field,
 114                                             u16 *clean_field)
 115 {
 116         int offset = evmcs_field_offset(field, clean_field);
 117
 118         WARN_ONCE(offset < 0, "KVM: accessing unsupported EVMCS field %lx\n",
 119                   field);
 120
 121         return offset;
 122 }
 123
 124 static __always_inline void evmcs_write64(unsigned long field, u64 value)
 125 {
 126         u16 clean_field;
 127         int offset = get_evmcs_offset(field, &clean_field);
 128
 129         if (offset < 0)
 130                 return;
 131
 132         *(u64 *)((char *)current_evmcs + offset) = value;
 133
 134         current_evmcs->hv_clean_fields &= ~clean_field;
 135 }
 136
 137 static inline void evmcs_write32(unsigned long field, u32 value)
 138 {
 139         u16 clean_field;
 140         int offset = get_evmcs_offset(field, &clean_field);
 141
 142         if (offset < 0)
 143                 return;
 144
 145         *(u32 *)((char *)current_evmcs + offset) = value;
 146         current_evmcs->hv_clean_fields &= ~clean_field;
 147 }
 148
 149 static inline void evmcs_write16(unsigned long field, u16 value)
 150 {
 151         u16 clean_field;
 152         int offset = get_evmcs_offset(field, &clean_field);
 153
 154         if (offset < 0)
 155                 return;
 156
 157         *(u16 *)((char *)current_evmcs + offset) = value;
 158         current_evmcs->hv_clean_fields &= ~clean_field;
 159 }
 160
 161 static inline u64 evmcs_read64(unsigned long field)
 162 {
 163         int offset = get_evmcs_offset(field, NULL);
 164
 165         if (offset < 0)
 166                 return 0;
 167
 168         return *(u64 *)((char *)current_evmcs + offset);
 169 }
 170
 171 static inline u32 evmcs_read32(unsigned long field)
 172 {
 173         int offset = get_evmcs_offset(field, NULL);
 174
 175         if (offset < 0)
 176                 return 0;
 177
 178         return *(u32 *)((char *)current_evmcs + offset);
 179 }
 180
 181 static inline u16 evmcs_read16(unsigned long field)
 182 {
 183         int offset = get_evmcs_offset(field, NULL);
 184
 185         if (offset < 0)
 186                 return 0;
 187
 188         return *(u16 *)((char *)current_evmcs + offset);
 189 }
 190
 191 static inline void evmcs_load(u64 phys_addr)
 192 {
 193         struct hv_vp_assist_page *vp_ap =
 194                 hv_get_vp_assist_page(smp_processor_id());
 195
 196         if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
 197                 vp_ap->nested_control.features.directhypercall = 1;
 198         vp_ap->current_nested_vmcs = phys_addr;
 199         vp_ap->enlighten_vmentry = 1;
 200 }
 201
 202 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 203 static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
 204 static inline void evmcs_write32(unsigned long field, u32 value) {}
 205 static inline void evmcs_write16(unsigned long field, u16 value) {}
 206 static inline u64 evmcs_read64(unsigned long field) { return 0; }
 207 static inline u32 evmcs_read32(unsigned long field) { return 0; }
 208 static inline u16 evmcs_read16(unsigned long field) { return 0; }
 209 static inline void evmcs_load(u64 phys_addr) {}
 210 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 211
 212 #define EVMPTR_INVALID (-1ULL)
 213 #define EVMPTR_MAP_PENDING (-2ULL)
 214
 215 static inline bool evmptr_is_valid(u64 evmptr)
 216 {
 217         return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
 218 }
 219
 220 enum nested_evmptrld_status {
 221         EVMPTRLD_DISABLED,
 222         EVMPTRLD_SUCCEEDED,
 223         EVMPTRLD_VMFAIL,
 224         EVMPTRLD_ERROR,
 225 };
 226
 227 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
 228 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
 229 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
 230                         uint16_t *vmcs_version);
 231 void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
 232 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
 233
 234 #endif /* __KVM_X86_VMX_EVMCS_H */