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
  14 struct vmcs_config;
  15
  16 DECLARE_STATIC_KEY_FALSE(enable_evmcs);
  17
  18 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
  19
  20 #define KVM_EVMCS_VERSION 1
  21
  22 /*
  23  * Enlightened VMCSv1 doesn't support these:
  24  *
  25  *      POSTED_INTR_NV                  = 0x00000002,
  26  *      GUEST_INTR_STATUS               = 0x00000810,
  27  *      APIC_ACCESS_ADDR                = 0x00002014,
  28  *      POSTED_INTR_DESC_ADDR           = 0x00002016,
  29  *      EOI_EXIT_BITMAP0                = 0x0000201c,
  30  *      EOI_EXIT_BITMAP1                = 0x0000201e,
  31  *      EOI_EXIT_BITMAP2                = 0x00002020,
  32  *      EOI_EXIT_BITMAP3                = 0x00002022,
  33  *      GUEST_PML_INDEX                 = 0x00000812,
  34  *      PML_ADDRESS                     = 0x0000200e,
  35  *      VM_FUNCTION_CONTROL             = 0x00002018,
  36  *      EPTP_LIST_ADDRESS               = 0x00002024,
  37  *      VMREAD_BITMAP                   = 0x00002026,
  38  *      VMWRITE_BITMAP                  = 0x00002028,
  39  *
  40  *      TSC_MULTIPLIER                  = 0x00002032,
  41  *      PLE_GAP                         = 0x00004020,
  42  *      PLE_WINDOW                      = 0x00004022,
  43  *      VMX_PREEMPTION_TIMER_VALUE      = 0x0000482E,
  44  *      GUEST_IA32_PERF_GLOBAL_CTRL     = 0x00002808,
  45  *      HOST_IA32_PERF_GLOBAL_CTRL      = 0x00002c04,
  46  *
  47  * Currently unsupported in KVM:
  48  *      GUEST_IA32_RTIT_CTL             = 0x00002814,
  49  */
  50 #define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
  51                                     PIN_BASED_VMX_PREEMPTION_TIMER)
  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_LOAD_IA32_PERF_GLOBAL_CTRL |                           \
  63          VM_EXIT_SAVE_VMX_PREEMPTION_TIMER)
  64 #define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
  65 #define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
  66
  67 #if IS_ENABLED(CONFIG_HYPERV)
  68
  69 struct evmcs_field {
  70         u16 offset;
  71         u16 clean_field;
  72 };
  73
  74 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
  75 extern const unsigned int nr_evmcs_1_fields;
  76
  77 #define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))
  78
  79 static __always_inline int get_evmcs_offset(unsigned long field,
  80                                             u16 *clean_field)
  81 {
  82         unsigned int index = ROL16(field, 6);
  83         const struct evmcs_field *evmcs_field;
  84
  85         if (unlikely(index >= nr_evmcs_1_fields)) {
  86                 WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
  87                           field);
  88                 return -ENOENT;
  89         }
  90
  91         evmcs_field = &vmcs_field_to_evmcs_1[index];
  92
  93         if (clean_field)
  94                 *clean_field = evmcs_field->clean_field;
  95
  96         return evmcs_field->offset;
  97 }
  98
  99 #undef ROL16
 100
 101 static inline void evmcs_write64(unsigned long field, u64 value)
 102 {
 103         u16 clean_field;
 104         int offset = get_evmcs_offset(field, &clean_field);
 105
 106         if (offset < 0)
 107                 return;
 108
 109         *(u64 *)((char *)current_evmcs + offset) = value;
 110
 111         current_evmcs->hv_clean_fields &= ~clean_field;
 112 }
 113
 114 static inline void evmcs_write32(unsigned long field, u32 value)
 115 {
 116         u16 clean_field;
 117         int offset = get_evmcs_offset(field, &clean_field);
 118
 119         if (offset < 0)
 120                 return;
 121
 122         *(u32 *)((char *)current_evmcs + offset) = value;
 123         current_evmcs->hv_clean_fields &= ~clean_field;
 124 }
 125
 126 static inline void evmcs_write16(unsigned long field, u16 value)
 127 {
 128         u16 clean_field;
 129         int offset = get_evmcs_offset(field, &clean_field);
 130
 131         if (offset < 0)
 132                 return;
 133
 134         *(u16 *)((char *)current_evmcs + offset) = value;
 135         current_evmcs->hv_clean_fields &= ~clean_field;
 136 }
 137
 138 static inline u64 evmcs_read64(unsigned long field)
 139 {
 140         int offset = get_evmcs_offset(field, NULL);
 141
 142         if (offset < 0)
 143                 return 0;
 144
 145         return *(u64 *)((char *)current_evmcs + offset);
 146 }
 147
 148 static inline u32 evmcs_read32(unsigned long field)
 149 {
 150         int offset = get_evmcs_offset(field, NULL);
 151
 152         if (offset < 0)
 153                 return 0;
 154
 155         return *(u32 *)((char *)current_evmcs + offset);
 156 }
 157
 158 static inline u16 evmcs_read16(unsigned long field)
 159 {
 160         int offset = get_evmcs_offset(field, NULL);
 161
 162         if (offset < 0)
 163                 return 0;
 164
 165         return *(u16 *)((char *)current_evmcs + offset);
 166 }
 167
 168 static inline void evmcs_touch_msr_bitmap(void)
 169 {
 170         if (unlikely(!current_evmcs))
 171                 return;
 172
 173         if (current_evmcs->hv_enlightenments_control.msr_bitmap)
 174                 current_evmcs->hv_clean_fields &=
 175                         ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
 176 }
 177
 178 static inline void evmcs_load(u64 phys_addr)
 179 {
 180         struct hv_vp_assist_page *vp_ap =
 181                 hv_get_vp_assist_page(smp_processor_id());
 182
 183         if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
 184                 vp_ap->nested_control.features.directhypercall = 1;
 185         vp_ap->current_nested_vmcs = phys_addr;
 186         vp_ap->enlighten_vmentry = 1;
 187 }
 188
 189 void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
 190 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 191 static inline void evmcs_write64(unsigned long field, u64 value) {}
 192 static inline void evmcs_write32(unsigned long field, u32 value) {}
 193 static inline void evmcs_write16(unsigned long field, u16 value) {}
 194 static inline u64 evmcs_read64(unsigned long field) { return 0; }
 195 static inline u32 evmcs_read32(unsigned long field) { return 0; }
 196 static inline u16 evmcs_read16(unsigned long field) { return 0; }
 197 static inline void evmcs_load(u64 phys_addr) {}
 198 static inline void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) {}
 199 static inline void evmcs_touch_msr_bitmap(void) {}
 200 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 201
 202 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
 203 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
 204 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
 205                         uint16_t *vmcs_version);
 206
 207 #endif /* __KVM_X86_VMX_EVMCS_H */