1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * KVM_GET/SET_* tests
4 *
5 * Copyright (C) 2018, Red Hat, Inc.
6 *
7 * Tests for vCPU state save/restore, including nested guest state.
8 */
9 #define _GNU_SOURCE /* for program_invocation_short_name */
10 #include <fcntl.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <sys/ioctl.h>
15
16 #include "test_util.h"
17
18 #include "kvm_util.h"
19 #include "processor.h"
20 #include "vmx.h"
21
22 #define VCPU_ID 5
23
l2_guest_code(void)24 void l2_guest_code(void)
25 {
26 GUEST_SYNC(6);
27
28 /* Exit to L1 */
29 vmcall();
30
31 /* L1 has now set up a shadow VMCS for us. */
32 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
33 GUEST_SYNC(10);
34 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
35 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0fffee));
36 GUEST_SYNC(11);
37 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0fffee);
38 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0ffffee));
39 GUEST_SYNC(12);
40
41 /* Done, exit to L1 and never come back. */
42 vmcall();
43 }
44
l1_guest_code(struct vmx_pages * vmx_pages)45 void l1_guest_code(struct vmx_pages *vmx_pages)
46 {
47 #define L2_GUEST_STACK_SIZE 64
48 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
49
50 GUEST_ASSERT(vmx_pages->vmcs_gpa);
51 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
52 GUEST_SYNC(3);
53 GUEST_ASSERT(load_vmcs(vmx_pages));
54 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
55
56 GUEST_SYNC(4);
57 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
58
59 prepare_vmcs(vmx_pages, l2_guest_code,
60 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
61
62 GUEST_SYNC(5);
63 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
64 GUEST_ASSERT(!vmlaunch());
65 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
66 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
67
68 /* Check that the launched state is preserved. */
69 GUEST_ASSERT(vmlaunch());
70
71 GUEST_ASSERT(!vmresume());
72 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
73
74 GUEST_SYNC(7);
75 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
76
77 GUEST_ASSERT(!vmresume());
78 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
79
80 vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3);
81
82 vmwrite(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS);
83 vmwrite(VMCS_LINK_POINTER, vmx_pages->shadow_vmcs_gpa);
84
85 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
86 GUEST_ASSERT(vmlaunch());
87 GUEST_SYNC(8);
88 GUEST_ASSERT(vmlaunch());
89 GUEST_ASSERT(vmresume());
90
91 vmwrite(GUEST_RIP, 0xc0ffee);
92 GUEST_SYNC(9);
93 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
94
95 GUEST_ASSERT(!vmptrld(vmx_pages->vmcs_gpa));
96 GUEST_ASSERT(!vmresume());
97 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
98
99 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
100 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
101 GUEST_ASSERT(vmlaunch());
102 GUEST_ASSERT(vmresume());
103 GUEST_SYNC(13);
104 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
105 GUEST_ASSERT(vmlaunch());
106 GUEST_ASSERT(vmresume());
107 }
108
guest_code(struct vmx_pages * vmx_pages)109 void guest_code(struct vmx_pages *vmx_pages)
110 {
111 GUEST_SYNC(1);
112 GUEST_SYNC(2);
113
114 if (vmx_pages)
115 l1_guest_code(vmx_pages);
116
117 GUEST_DONE();
118 }
119
main(int argc,char * argv[])120 int main(int argc, char *argv[])
121 {
122 vm_vaddr_t vmx_pages_gva = 0;
123
124 struct kvm_regs regs1, regs2;
125 struct kvm_vm *vm;
126 struct kvm_run *run;
127 struct kvm_x86_state *state;
128 struct ucall uc;
129 int stage;
130
131 /* Create VM */
132 vm = vm_create_default(VCPU_ID, 0, guest_code);
133 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
134 run = vcpu_state(vm, VCPU_ID);
135
136 vcpu_regs_get(vm, VCPU_ID, ®s1);
137
138 if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
139 vcpu_alloc_vmx(vm, &vmx_pages_gva);
140 vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
141 } else {
142 printf("will skip nested state checks\n");
143 vcpu_args_set(vm, VCPU_ID, 1, 0);
144 }
145
146 for (stage = 1;; stage++) {
147 _vcpu_run(vm, VCPU_ID);
148 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
149 "Stage %d: unexpected exit reason: %u (%s),\n",
150 stage, run->exit_reason,
151 exit_reason_str(run->exit_reason));
152
153 switch (get_ucall(vm, VCPU_ID, &uc)) {
154 case UCALL_ABORT:
155 TEST_ASSERT(false, "%s at %s:%d", (const char *)uc.args[0],
156 __FILE__, uc.args[1]);
157 /* NOT REACHED */
158 case UCALL_SYNC:
159 break;
160 case UCALL_DONE:
161 goto done;
162 default:
163 TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
164 }
165
166 /* UCALL_SYNC is handled here. */
167 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
168 uc.args[1] == stage, "Unexpected register values vmexit #%lx, got %lx",
169 stage, (ulong)uc.args[1]);
170
171 state = vcpu_save_state(vm, VCPU_ID);
172 memset(®s1, 0, sizeof(regs1));
173 vcpu_regs_get(vm, VCPU_ID, ®s1);
174
175 kvm_vm_release(vm);
176
177 /* Restore state in a new VM. */
178 kvm_vm_restart(vm, O_RDWR);
179 vm_vcpu_add(vm, VCPU_ID);
180 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
181 vcpu_load_state(vm, VCPU_ID, state);
182 run = vcpu_state(vm, VCPU_ID);
183 free(state);
184
185 memset(®s2, 0, sizeof(regs2));
186 vcpu_regs_get(vm, VCPU_ID, ®s2);
187 TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)),
188 "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
189 (ulong) regs2.rdi, (ulong) regs2.rsi);
190 }
191
192 done:
193 kvm_vm_free(vm);
194 }
195