1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2018, Red Hat, Inc.
4 *
5 * Tests for Enlightened VMCS, including nested guest state.
6 */
7 #define _GNU_SOURCE /* for program_invocation_short_name */
8 #include <fcntl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <sys/ioctl.h>
13
14 #include "test_util.h"
15
16 #include "kvm_util.h"
17
18 #include "vmx.h"
19
20 #define VCPU_ID 5
21
l2_guest_code(void)22 void l2_guest_code(void)
23 {
24 GUEST_SYNC(6);
25
26 GUEST_SYNC(7);
27
28 /* Done, exit to L1 and never come back. */
29 vmcall();
30 }
31
l1_guest_code(struct vmx_pages * vmx_pages)32 void l1_guest_code(struct vmx_pages *vmx_pages)
33 {
34 #define L2_GUEST_STACK_SIZE 64
35 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
36
37 enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist);
38
39 GUEST_ASSERT(vmx_pages->vmcs_gpa);
40 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
41 GUEST_SYNC(3);
42 GUEST_ASSERT(load_vmcs(vmx_pages));
43 GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
44
45 GUEST_SYNC(4);
46 GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
47
48 prepare_vmcs(vmx_pages, l2_guest_code,
49 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
50
51 GUEST_SYNC(5);
52 GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
53 GUEST_ASSERT(!vmlaunch());
54 GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
55 GUEST_SYNC(8);
56 GUEST_ASSERT(!vmresume());
57 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
58 GUEST_SYNC(9);
59 }
60
guest_code(struct vmx_pages * vmx_pages)61 void guest_code(struct vmx_pages *vmx_pages)
62 {
63 GUEST_SYNC(1);
64 GUEST_SYNC(2);
65
66 if (vmx_pages)
67 l1_guest_code(vmx_pages);
68
69 GUEST_DONE();
70 }
71
main(int argc,char * argv[])72 int main(int argc, char *argv[])
73 {
74 vm_vaddr_t vmx_pages_gva = 0;
75
76 struct kvm_regs regs1, regs2;
77 struct kvm_vm *vm;
78 struct kvm_run *run;
79 struct kvm_x86_state *state;
80 struct ucall uc;
81 int stage;
82
83 /* Create VM */
84 vm = vm_create_default(VCPU_ID, 0, guest_code);
85
86 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
87
88 if (!kvm_check_cap(KVM_CAP_NESTED_STATE) ||
89 !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
90 printf("capabilities not available, skipping test\n");
91 exit(KSFT_SKIP);
92 }
93
94 vcpu_enable_evmcs(vm, VCPU_ID);
95
96 run = vcpu_state(vm, VCPU_ID);
97
98 vcpu_regs_get(vm, VCPU_ID, ®s1);
99
100 vcpu_alloc_vmx(vm, &vmx_pages_gva);
101 vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
102
103 for (stage = 1;; stage++) {
104 _vcpu_run(vm, VCPU_ID);
105 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
106 "Stage %d: unexpected exit reason: %u (%s),\n",
107 stage, run->exit_reason,
108 exit_reason_str(run->exit_reason));
109
110 switch (get_ucall(vm, VCPU_ID, &uc)) {
111 case UCALL_ABORT:
112 TEST_ASSERT(false, "%s at %s:%d", (const char *)uc.args[0],
113 __FILE__, uc.args[1]);
114 /* NOT REACHED */
115 case UCALL_SYNC:
116 break;
117 case UCALL_DONE:
118 goto done;
119 default:
120 TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
121 }
122
123 /* UCALL_SYNC is handled here. */
124 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
125 uc.args[1] == stage, "Unexpected register values vmexit #%lx, got %lx",
126 stage, (ulong)uc.args[1]);
127
128 state = vcpu_save_state(vm, VCPU_ID);
129 memset(®s1, 0, sizeof(regs1));
130 vcpu_regs_get(vm, VCPU_ID, ®s1);
131
132 kvm_vm_release(vm);
133
134 /* Restore state in a new VM. */
135 kvm_vm_restart(vm, O_RDWR);
136 vm_vcpu_add(vm, VCPU_ID);
137 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
138 vcpu_enable_evmcs(vm, VCPU_ID);
139 vcpu_load_state(vm, VCPU_ID, state);
140 run = vcpu_state(vm, VCPU_ID);
141 free(state);
142
143 memset(®s2, 0, sizeof(regs2));
144 vcpu_regs_get(vm, VCPU_ID, ®s2);
145 TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)),
146 "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
147 (ulong) regs2.rdi, (ulong) regs2.rsi);
148 }
149
150 done:
151 kvm_vm_free(vm);
152 }
153