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
get_evmcs_offset(unsigned long field,u16 * clean_field)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
evmcs_write64(unsigned long field,u64 value)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
evmcs_write32(unsigned long field,u32 value)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
evmcs_write16(unsigned long field,u16 value)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
evmcs_read64(unsigned long field)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
evmcs_read32(unsigned long field)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
evmcs_read16(unsigned long field)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
evmcs_touch_msr_bitmap(void)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
evmcs_load(u64 phys_addr)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) */
evmcs_write64(unsigned long field,u64 value)191 static inline void evmcs_write64(unsigned long field, u64 value) {}
evmcs_write32(unsigned long field,u32 value)192 static inline void evmcs_write32(unsigned long field, u32 value) {}
evmcs_write16(unsigned long field,u16 value)193 static inline void evmcs_write16(unsigned long field, u16 value) {}
evmcs_read64(unsigned long field)194 static inline u64 evmcs_read64(unsigned long field) { return 0; }
evmcs_read32(unsigned long field)195 static inline u32 evmcs_read32(unsigned long field) { return 0; }
evmcs_read16(unsigned long field)196 static inline u16 evmcs_read16(unsigned long field) { return 0; }
evmcs_load(u64 phys_addr)197 static inline void evmcs_load(u64 phys_addr) {}
evmcs_sanitize_exec_ctrls(struct vmcs_config * vmcs_conf)198 static inline void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) {}
evmcs_touch_msr_bitmap(void)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 */
208