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
evmcs_field_offset(unsigned long field,u16 * clean_field)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
evmcs_read_any(struct hv_enlightened_vmcs * evmcs,unsigned long field,u16 offset)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
get_evmcs_offset(unsigned long field,u16 * clean_field)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
evmcs_write64(unsigned long field,u64 value)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
evmcs_write32(unsigned long field,u32 value)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
evmcs_write16(unsigned long field,u16 value)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
evmcs_read64(unsigned long field)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
evmcs_read32(unsigned long field)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
evmcs_read16(unsigned long field)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
evmcs_touch_msr_bitmap(void)191 static inline void evmcs_touch_msr_bitmap(void)
192 {
193 if (unlikely(!current_evmcs))
194 return;
195
196 if (current_evmcs->hv_enlightenments_control.msr_bitmap)
197 current_evmcs->hv_clean_fields &=
198 ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
199 }
200
evmcs_load(u64 phys_addr)201 static inline void evmcs_load(u64 phys_addr)
202 {
203 struct hv_vp_assist_page *vp_ap =
204 hv_get_vp_assist_page(smp_processor_id());
205
206 if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
207 vp_ap->nested_control.features.directhypercall = 1;
208 vp_ap->current_nested_vmcs = phys_addr;
209 vp_ap->enlighten_vmentry = 1;
210 }
211
212 #else /* !IS_ENABLED(CONFIG_HYPERV) */
evmcs_write64(unsigned long field,u64 value)213 static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
evmcs_write32(unsigned long field,u32 value)214 static inline void evmcs_write32(unsigned long field, u32 value) {}
evmcs_write16(unsigned long field,u16 value)215 static inline void evmcs_write16(unsigned long field, u16 value) {}
evmcs_read64(unsigned long field)216 static inline u64 evmcs_read64(unsigned long field) { return 0; }
evmcs_read32(unsigned long field)217 static inline u32 evmcs_read32(unsigned long field) { return 0; }
evmcs_read16(unsigned long field)218 static inline u16 evmcs_read16(unsigned long field) { return 0; }
evmcs_load(u64 phys_addr)219 static inline void evmcs_load(u64 phys_addr) {}
evmcs_touch_msr_bitmap(void)220 static inline void evmcs_touch_msr_bitmap(void) {}
221 #endif /* IS_ENABLED(CONFIG_HYPERV) */
222
223 #define EVMPTR_INVALID (-1ULL)
224 #define EVMPTR_MAP_PENDING (-2ULL)
225
evmptr_is_valid(u64 evmptr)226 static inline bool evmptr_is_valid(u64 evmptr)
227 {
228 return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
229 }
230
231 enum nested_evmptrld_status {
232 EVMPTRLD_DISABLED,
233 EVMPTRLD_SUCCEEDED,
234 EVMPTRLD_VMFAIL,
235 EVMPTRLD_ERROR,
236 };
237
238 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
239 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
240 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
241 uint16_t *vmcs_version);
242 void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
243 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
244
245 #endif /* __KVM_X86_VMX_EVMCS_H */
246
