-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathvmcs.cpp
218 lines (172 loc) · 8.06 KB
/
vmcs.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
#include "vmcs.hpp"
namespace vmcs
{
auto setup_host(void* host_rip, u64 host_rsp, cr3 cr3_value, u64 gdt_base) -> void
{
__vmx_vmwrite(VMCS_HOST_CR0, __readcr0());
__vmx_vmwrite(VMCS_HOST_CR3, cr3_value.flags);
__vmx_vmwrite(VMCS_HOST_CR4, __readcr4());
__vmx_vmwrite(VMCS_HOST_RSP, host_rsp + (PAGE_SIZE * HOST_STACK_PAGES));
__vmx_vmwrite(VMCS_HOST_RIP, reinterpret_cast<u64>(host_rip));
__vmx_vmwrite(VMCS_HOST_GDTR_BASE, gdt_base);
__vmx_vmwrite(VMCS_HOST_IDTR_BASE, reinterpret_cast<u64>(idt::table));
segment_selector es{ reades() };
es.request_privilege_level = NULL;
es.table = NULL;
__vmx_vmwrite(VMCS_HOST_ES_SELECTOR, es.flags);
segment_selector cs{ readcs() };
cs.request_privilege_level = NULL;
cs.table = NULL;
__vmx_vmwrite(VMCS_HOST_CS_SELECTOR, cs.flags);
segment_selector ds{ readds() };
ds.request_privilege_level = NULL;
ds.table = NULL;
__vmx_vmwrite(VMCS_HOST_DS_SELECTOR, ds.flags);
segment_selector fs{ readfs() };
fs.request_privilege_level = NULL;
fs.table = NULL;
__vmx_vmwrite(VMCS_HOST_FS_SELECTOR, fs.flags);
__vmx_vmwrite(VMCS_HOST_FS_BASE, __readmsr(IA32_FS_BASE));
segment_selector gs{ readgs() };
gs.request_privilege_level = NULL;
gs.table = NULL;
__vmx_vmwrite(VMCS_HOST_GS_SELECTOR, gs.flags);
__vmx_vmwrite(VMCS_HOST_GS_BASE, __readmsr(IA32_GS_BASE));
segment_selector ss{ readss() };
ss.request_privilege_level = NULL;
ss.table = NULL;
__vmx_vmwrite(VMCS_HOST_SS_SELECTOR, ss.flags);
segment_selector tr{ readtr() };
tr.request_privilege_level = NULL;
tr.table = NULL;
__vmx_vmwrite(VMCS_HOST_TR_SELECTOR, tr.flags);
}
auto setup_guest() -> void
{
segment_descriptor_register_64 gdt_value;
segment_descriptor_register_64 idt_value;
__sidt(&idt_value);
_sgdt(&gdt_value);
__vmx_vmwrite(VMCS_GUEST_CR0, __readcr0());
__vmx_vmwrite(VMCS_GUEST_CR3, __readcr3());
__vmx_vmwrite(VMCS_GUEST_CR4, __readcr4());
__vmx_vmwrite(VMCS_GUEST_VMCS_LINK_POINTER, ~0ULL);
__vmx_vmwrite(VMCS_GUEST_GDTR_BASE, gdt_value.base_address);
__vmx_vmwrite(VMCS_GUEST_GDTR_LIMIT, gdt_value.limit);
__vmx_vmwrite(VMCS_GUEST_IDTR_BASE, idt_value.base_address);
__vmx_vmwrite(VMCS_GUEST_IDTR_LIMIT, idt_value.limit);
__vmx_vmwrite(VMCS_GUEST_RFLAGS, __readeflags());
__vmx_vmwrite(VMCS_GUEST_DR7, __readdr(7));
const auto [es_descriptor, es_rights, es_limit, es_base] =
gdt::get_info(gdt_value, segment_selector{ reades() });
__vmx_vmwrite(VMCS_GUEST_ES_BASE, es_base);
__vmx_vmwrite(VMCS_GUEST_ES_LIMIT, es_limit);
__vmx_vmwrite(VMCS_GUEST_ES_SELECTOR, reades());
__vmx_vmwrite(VMCS_GUEST_ES_ACCESS_RIGHTS, es_rights.flags);
const auto [fs_descriptor, fs_rights, fs_limit, fs_base] =
gdt::get_info(gdt_value, segment_selector{ readfs() });
__vmx_vmwrite(VMCS_GUEST_FS_BASE, fs_base);
__vmx_vmwrite(VMCS_GUEST_FS_LIMIT, fs_limit);
__vmx_vmwrite(VMCS_GUEST_FS_SELECTOR, readfs());
__vmx_vmwrite(VMCS_GUEST_FS_ACCESS_RIGHTS, fs_rights.flags);
const auto [gs_descriptor, gs_rights, gs_limit, gs_base] =
gdt::get_info(gdt_value, segment_selector{ readgs() });
__vmx_vmwrite(VMCS_GUEST_GS_BASE, gs_base);
__vmx_vmwrite(VMCS_GUEST_GS_LIMIT, gs_limit);
__vmx_vmwrite(VMCS_GUEST_GS_SELECTOR, readgs());
__vmx_vmwrite(VMCS_GUEST_GS_ACCESS_RIGHTS, gs_rights.flags);
const auto [ss_descriptor, ss_rights, ss_limit, ss_base] =
gdt::get_info(gdt_value, segment_selector{ readss() });
__vmx_vmwrite(VMCS_GUEST_SS_BASE, ss_base);
__vmx_vmwrite(VMCS_GUEST_SS_LIMIT, ss_limit);
__vmx_vmwrite(VMCS_GUEST_SS_SELECTOR, readss());
__vmx_vmwrite(VMCS_GUEST_SS_ACCESS_RIGHTS, ss_rights.flags);
const auto [cs_descriptor, cs_rights, cs_limit, cs_base] =
gdt::get_info(gdt_value, segment_selector{ readcs() });
__vmx_vmwrite(VMCS_GUEST_CS_BASE, cs_base);
__vmx_vmwrite(VMCS_GUEST_CS_LIMIT, cs_limit);
__vmx_vmwrite(VMCS_GUEST_CS_SELECTOR, readcs());
__vmx_vmwrite(VMCS_GUEST_CS_ACCESS_RIGHTS, cs_rights.flags);
const auto [ds_descriptor, ds_rights, ds_limit, ds_base] =
gdt::get_info(gdt_value, segment_selector{ readds() });
__vmx_vmwrite(VMCS_GUEST_DS_BASE, ds_base);
__vmx_vmwrite(VMCS_GUEST_DS_LIMIT, ds_limit);
__vmx_vmwrite(VMCS_GUEST_DS_SELECTOR, readds());
__vmx_vmwrite(VMCS_GUEST_DS_ACCESS_RIGHTS, ds_rights.flags);
const auto [tr_descriptor, tr_rights, tr_limit, tr_base] =
gdt::get_info(gdt_value, segment_selector{ readtr() });
__vmx_vmwrite(VMCS_GUEST_TR_BASE, tr_base);
__vmx_vmwrite(VMCS_GUEST_TR_LIMIT, tr_limit);
__vmx_vmwrite(VMCS_GUEST_TR_SELECTOR, readtr());
__vmx_vmwrite(VMCS_GUEST_TR_ACCESS_RIGHTS, tr_rights.flags);
const auto [ldt_descriptor, ldt_rights, ldt_limit, ldt_base] =
gdt::get_info(gdt_value, segment_selector{ readldt() });
__vmx_vmwrite(VMCS_GUEST_LDTR_BASE, ldt_base);
__vmx_vmwrite(VMCS_GUEST_LDTR_LIMIT, ldt_limit);
__vmx_vmwrite(VMCS_GUEST_LDTR_SELECTOR, readldt());
__vmx_vmwrite(VMCS_GUEST_LDTR_ACCESS_RIGHTS, ldt_rights.flags);
__vmx_vmwrite(VMCS_GUEST_ACTIVITY_STATE, 0);
__vmx_vmwrite(VMCS_GUEST_GS_BASE, __readmsr(IA32_GS_BASE));
}
auto setup_controls() -> void
{
ia32_vmx_true_ctls_register msr_fix_value{};
ia32_vmx_pinbased_ctls_register pinbased_ctls{};
ia32_vmx_procbased_ctls_register procbased_ctls{};
ia32_vmx_procbased_ctls2_register procbased_ctls2{};
ia32_vmx_entry_ctls_register entry_ctls{};
ia32_vmx_exit_ctls_register exit_ctls{};
ia32_vmx_basic_register vmx_basic{ __readmsr(IA32_VMX_BASIC) };
pinbased_ctls.virtual_nmi = true;
pinbased_ctls.nmi_exiting = true;
procbased_ctls.activate_secondary_controls = true;
exit_ctls.host_address_space_size = true;
entry_ctls.ia32e_mode_guest = true;
entry_ctls.conceal_vmx_from_pt = true;
procbased_ctls2.enable_rdtscp = true;
procbased_ctls2.enable_xsaves = true;
procbased_ctls2.conceal_vmx_from_pt = true;
if (vmx_basic.vmx_controls)
{
msr_fix_value.flags = __readmsr(IA32_VMX_TRUE_PINBASED_CTLS);
pinbased_ctls.flags &= msr_fix_value.allowed_1_settings;
pinbased_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_PIN_BASED_VM_EXECUTION_CONTROLS, pinbased_ctls.flags);
msr_fix_value.flags = __readmsr(IA32_VMX_TRUE_PROCBASED_CTLS);
procbased_ctls.flags &= msr_fix_value.allowed_1_settings;
procbased_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, procbased_ctls.flags);
msr_fix_value.flags = __readmsr(IA32_VMX_TRUE_ENTRY_CTLS);
entry_ctls.flags &= msr_fix_value.allowed_1_settings;
entry_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_VMENTRY_CONTROLS, entry_ctls.flags);
msr_fix_value.flags = __readmsr(IA32_VMX_TRUE_EXIT_CTLS);
exit_ctls.flags &= msr_fix_value.allowed_1_settings;
exit_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_VMEXIT_CONTROLS, exit_ctls.flags);
}
else
{
msr_fix_value.flags = __readmsr(IA32_VMX_PINBASED_CTLS);
pinbased_ctls.flags &= msr_fix_value.allowed_1_settings;
pinbased_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_PIN_BASED_VM_EXECUTION_CONTROLS, pinbased_ctls.flags);
msr_fix_value.flags = __readmsr(IA32_VMX_PROCBASED_CTLS);
procbased_ctls.flags &= msr_fix_value.allowed_1_settings;
procbased_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, procbased_ctls.flags);
msr_fix_value.flags = __readmsr(IA32_VMX_ENTRY_CTLS);
entry_ctls.flags &= msr_fix_value.allowed_1_settings;
entry_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_VMENTRY_CONTROLS, entry_ctls.flags);
msr_fix_value.flags = __readmsr(IA32_VMX_EXIT_CTLS);
exit_ctls.flags &= msr_fix_value.allowed_1_settings;
exit_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_VMEXIT_CONTROLS, exit_ctls.flags);
}
msr_fix_value.flags = __readmsr(IA32_VMX_PROCBASED_CTLS2);
procbased_ctls2.flags &= msr_fix_value.allowed_1_settings;
procbased_ctls2.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_SECONDARY_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, procbased_ctls2.flags);
}
}