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 \
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
68 #if IS_ENABLED(CONFIG_HYPERV)
69
70 struct evmcs_field {
71 u16 offset;
72 u16 clean_field;
73 };
74
75 extern const struct evmcs_field vmcs_field_to_evmcs_1[];
76 extern const unsigned int nr_evmcs_1_fields;
77
78 #define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))
79
get_evmcs_offset(unsigned long field,u16 * clean_field)80 static __always_inline int get_evmcs_offset(unsigned long field,
81 u16 *clean_field)
82 {
83 unsigned int index = ROL16(field, 6);
84 const struct evmcs_field *evmcs_field;
85
86 if (unlikely(index >= nr_evmcs_1_fields)) {
87 WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
88 field);
89 return -ENOENT;
90 }
91
92 evmcs_field = &vmcs_field_to_evmcs_1[index];
93
94 if (clean_field)
95 *clean_field = evmcs_field->clean_field;
96
97 return evmcs_field->offset;
98 }
99
100 #undef ROL16
101
evmcs_write64(unsigned long field,u64 value)102 static inline void evmcs_write64(unsigned long field, u64 value)
103 {
104 u16 clean_field;
105 int offset = get_evmcs_offset(field, &clean_field);
106
107 if (offset < 0)
108 return;
109
110 *(u64 *)((char *)current_evmcs + offset) = value;
111
112 current_evmcs->hv_clean_fields &= ~clean_field;
113 }
114
evmcs_write32(unsigned long field,u32 value)115 static inline void evmcs_write32(unsigned long field, u32 value)
116 {
117 u16 clean_field;
118 int offset = get_evmcs_offset(field, &clean_field);
119
120 if (offset < 0)
121 return;
122
123 *(u32 *)((char *)current_evmcs + offset) = value;
124 current_evmcs->hv_clean_fields &= ~clean_field;
125 }
126
evmcs_write16(unsigned long field,u16 value)127 static inline void evmcs_write16(unsigned long field, u16 value)
128 {
129 u16 clean_field;
130 int offset = get_evmcs_offset(field, &clean_field);
131
132 if (offset < 0)
133 return;
134
135 *(u16 *)((char *)current_evmcs + offset) = value;
136 current_evmcs->hv_clean_fields &= ~clean_field;
137 }
138
evmcs_read64(unsigned long field)139 static inline u64 evmcs_read64(unsigned long field)
140 {
141 int offset = get_evmcs_offset(field, NULL);
142
143 if (offset < 0)
144 return 0;
145
146 return *(u64 *)((char *)current_evmcs + offset);
147 }
148
evmcs_read32(unsigned long field)149 static inline u32 evmcs_read32(unsigned long field)
150 {
151 int offset = get_evmcs_offset(field, NULL);
152
153 if (offset < 0)
154 return 0;
155
156 return *(u32 *)((char *)current_evmcs + offset);
157 }
158
evmcs_read16(unsigned long field)159 static inline u16 evmcs_read16(unsigned long field)
160 {
161 int offset = get_evmcs_offset(field, NULL);
162
163 if (offset < 0)
164 return 0;
165
166 return *(u16 *)((char *)current_evmcs + offset);
167 }
168
evmcs_load(u64 phys_addr)169 static inline void evmcs_load(u64 phys_addr)
170 {
171 struct hv_vp_assist_page *vp_ap =
172 hv_get_vp_assist_page(smp_processor_id());
173
174 if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
175 vp_ap->nested_control.features.directhypercall = 1;
176 vp_ap->current_nested_vmcs = phys_addr;
177 vp_ap->enlighten_vmentry = 1;
178 }
179
180 __init void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
181 #else /* !IS_ENABLED(CONFIG_HYPERV) */
evmcs_write64(unsigned long field,u64 value)182 static inline void evmcs_write64(unsigned long field, u64 value) {}
evmcs_write32(unsigned long field,u32 value)183 static inline void evmcs_write32(unsigned long field, u32 value) {}
evmcs_write16(unsigned long field,u16 value)184 static inline void evmcs_write16(unsigned long field, u16 value) {}
evmcs_read64(unsigned long field)185 static inline u64 evmcs_read64(unsigned long field) { return 0; }
evmcs_read32(unsigned long field)186 static inline u32 evmcs_read32(unsigned long field) { return 0; }
evmcs_read16(unsigned long field)187 static inline u16 evmcs_read16(unsigned long field) { return 0; }
evmcs_load(u64 phys_addr)188 static inline void evmcs_load(u64 phys_addr) {}
189 #endif /* IS_ENABLED(CONFIG_HYPERV) */
190
191 enum nested_evmptrld_status {
192 EVMPTRLD_DISABLED,
193 EVMPTRLD_SUCCEEDED,
194 EVMPTRLD_VMFAIL,
195 EVMPTRLD_ERROR,
196 };
197
198 bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
199 uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
200 int nested_enable_evmcs(struct kvm_vcpu *vcpu,
201 uint16_t *vmcs_version);
202 void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata);
203 int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
204
205 #endif /* __KVM_X86_VMX_EVMCS_H */
206