evmcs.h (6937B)
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 15struct vmcs_config; 16 17DECLARE_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 68struct evmcs_field { 69 u16 offset; 70 u16 clean_field; 71}; 72 73extern const struct evmcs_field vmcs_field_to_evmcs_1[]; 74extern const unsigned int nr_evmcs_1_fields; 75 76static __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 101static 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 115static __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 126static __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 139static 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 151static 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 163static 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 173static 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 183static 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 193static 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 203static 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) */ 216static __always_inline void evmcs_write64(unsigned long field, u64 value) {} 217static inline void evmcs_write32(unsigned long field, u32 value) {} 218static inline void evmcs_write16(unsigned long field, u16 value) {} 219static inline u64 evmcs_read64(unsigned long field) { return 0; } 220static inline u32 evmcs_read32(unsigned long field) { return 0; } 221static inline u16 evmcs_read16(unsigned long field) { return 0; } 222static inline void evmcs_load(u64 phys_addr) {} 223static 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 229static inline bool evmptr_is_valid(u64 evmptr) 230{ 231 return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING; 232} 233 234enum nested_evmptrld_status { 235 EVMPTRLD_DISABLED, 236 EVMPTRLD_SUCCEEDED, 237 EVMPTRLD_VMFAIL, 238 EVMPTRLD_ERROR, 239}; 240 241bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa); 242uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu); 243int nested_enable_evmcs(struct kvm_vcpu *vcpu, 244 uint16_t *vmcs_version); 245void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata); 246int nested_evmcs_check_controls(struct vmcs12 *vmcs12); 247 248#endif /* __KVM_X86_VMX_EVMCS_H */