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 (VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
  63 #define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
  64 #define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
  65
  66 #if IS_ENABLED(CONFIG_HYPERV)
  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 #define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))
  77
  78 static __always_inline int get_evmcs_offset(unsigned long field,
  79                                             u16 *clean_field)
  80 {
  81         unsigned int index = ROL16(field, 6);
  82         const struct evmcs_field *evmcs_field;
  83
  84         if (unlikely(index >= nr_evmcs_1_fields)) {
  85                 WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
  86                           field);
  87                 return -ENOENT;
  88         }
  89
  90         evmcs_field = &vmcs_field_to_evmcs_1[index];
  91
  92         if (clean_field)
  93                 *clean_field = evmcs_field->clean_field;
  94
  95         return evmcs_field->offset;
  96 }
  97
  98 #undef ROL16
  99
 100 static inline void evmcs_write64(unsigned long field, u64 value)
 101 {
 102         u16 clean_field;
 103         int offset = get_evmcs_offset(field, &clean_field);
 104
 105         if (offset < 0)
 106                 return;
 107
 108         *(u64 *)((char *)current_evmcs + offset) = value;
 109
 110         current_evmcs->hv_clean_fields &= ~clean_field;
 111 }
 112
 113 static inline void evmcs_write32(unsigned long field, u32 value)
 114 {
 115         u16 clean_field;
 116         int offset = get_evmcs_offset(field, &clean_field);
 117
 118         if (offset < 0)
 119                 return;
 120
 121         *(u32 *)((char *)current_evmcs + offset) = value;
 122         current_evmcs->hv_clean_fields &= ~clean_field;
 123 }
 124
 125 static inline void evmcs_write16(unsigned long field, u16 value)
 126 {
 127         u16 clean_field;
 128         int offset = get_evmcs_offset(field, &clean_field);
 129
 130         if (offset < 0)
 131                 return;
 132
 133         *(u16 *)((char *)current_evmcs + offset) = value;
 134         current_evmcs->hv_clean_fields &= ~clean_field;
 135 }
 136
 137 static inline u64 evmcs_read64(unsigned long field)
 138 {
 139         int offset = get_evmcs_offset(field, NULL);
 140
 141         if (offset < 0)
 142                 return 0;
 143
 144         return *(u64 *)((char *)current_evmcs + offset);
 145 }
 146
 147 static inline u32 evmcs_read32(unsigned long field)
 148 {
 149         int offset = get_evmcs_offset(field, NULL);
 150
 151         if (offset < 0)
 152                 return 0;
 153
 154         return *(u32 *)((char *)current_evmcs + offset);
 155 }
 156
 157 static inline u16 evmcs_read16(unsigned long field)
 158 {
 159         int offset = get_evmcs_offset(field, NULL);
 160
 161         if (offset < 0)
 162                 return 0;
 163
 164         return *(u16 *)((char *)current_evmcs + offset);
 165 }
 166
 167 static inline void evmcs_touch_msr_bitmap(void)
 168 {
 169         if (unlikely(!current_evmcs))
 170                 return;
 171
 172         if (current_evmcs->hv_enlightenments_control.msr_bitmap)
 173                 current_evmcs->hv_clean_fields &=
 174                         ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
 175 }
 176
 177 static inline void evmcs_load(u64 phys_addr)
 178 {
 179         struct hv_vp_assist_page *vp_ap =
 180                 hv_get_vp_assist_page(smp_processor_id());
 181
 182         if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
 183                 vp_ap->nested_control.features.directhypercall = 1;
 184         vp_ap->current_nested_vmcs = phys_addr;
 185         vp_ap->enlighten_vmentry = 1;
 186 }
 187
 188 __init void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
 189 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 190 static inline void evmcs_write64(unsigned long field, u64 value) {}
 191 static inline void evmcs_write32(unsigned long field, u32 value) {}
 192 static inline void evmcs_write16(unsigned long field, u16 value) {}
 193 static inline u64 evmcs_read64(unsigned long field) { return 0; }
 194 static inline u32 evmcs_read32(unsigned long field) { return 0; }
 195 static inline u16 evmcs_read16(unsigned long field) { return 0; }
 196 static inline void evmcs_load(u64 phys_addr) {}
 197 static inline void evmcs_touch_msr_bitmap(void) {}
 198 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 199
 200 #define EVMPTR_INVALID (-1ULL)
 201 #define EVMPTR_MAP_PENDING (-2ULL)
 202
 203 static inline bool evmptr_is_valid(u64 evmptr)
 204 {
 205         return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
 206 }
 207
 208 enum nested_evmptrld_status {
 209         EVMPTRLD_DISABLED,
 210         EVMPTRLD_SUCCEEDED,
 211         EVMPTRLD_VMFAIL,
 212         EVMPTRLD_ERROR,
 213 };
 214
 215 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
 216 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
 217 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
 218                         uint16_t *vmcs_version);
 219 void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata);
 220 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
 221
 222 #endif /* __KVM_X86_VMX_EVMCS_H */