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(7);
25
26 GUEST_SYNC(8);
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 current_evmcs->revision_id = -1u;
54 GUEST_ASSERT(vmlaunch());
55 current_evmcs->revision_id = EVMCS_VERSION;
56 GUEST_SYNC(6);
57
58 GUEST_ASSERT(!vmlaunch());
59 GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
60 GUEST_SYNC(9);
61 GUEST_ASSERT(!vmresume());
62 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
63 GUEST_SYNC(10);
64 }
65
guest_code(struct vmx_pages * vmx_pages)66 void guest_code(struct vmx_pages *vmx_pages)
67 {
68 GUEST_SYNC(1);
69 GUEST_SYNC(2);
70
71 if (vmx_pages)
72 l1_guest_code(vmx_pages);
73
74 GUEST_DONE();
75
76 /* Try enlightened vmptrld with an incorrect GPA */
77 evmcs_vmptrld(0xdeadbeef, vmx_pages->enlightened_vmcs);
78 GUEST_ASSERT(vmlaunch());
79 }
80
main(int argc,char * argv[])81 int main(int argc, char *argv[])
82 {
83 vm_vaddr_t vmx_pages_gva = 0;
84
85 struct kvm_regs regs1, regs2;
86 struct kvm_vm *vm;
87 struct kvm_run *run;
88 struct kvm_x86_state *state;
89 struct ucall uc;
90 int stage;
91
92 /* Create VM */
93 vm = vm_create_default(VCPU_ID, 0, guest_code);
94
95 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
96
97 if (!nested_vmx_supported() ||
98 !kvm_check_cap(KVM_CAP_NESTED_STATE) ||
99 !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
100 print_skip("Enlightened VMCS is unsupported");
101 exit(KSFT_SKIP);
102 }
103
104 vcpu_enable_evmcs(vm, VCPU_ID);
105
106 run = vcpu_state(vm, VCPU_ID);
107
108 vcpu_regs_get(vm, VCPU_ID, ®s1);
109
110 vcpu_alloc_vmx(vm, &vmx_pages_gva);
111 vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
112
113 for (stage = 1;; stage++) {
114 _vcpu_run(vm, VCPU_ID);
115 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
116 "Stage %d: unexpected exit reason: %u (%s),\n",
117 stage, run->exit_reason,
118 exit_reason_str(run->exit_reason));
119
120 switch (get_ucall(vm, VCPU_ID, &uc)) {
121 case UCALL_ABORT:
122 TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
123 __FILE__, uc.args[1]);
124 /* NOT REACHED */
125 case UCALL_SYNC:
126 break;
127 case UCALL_DONE:
128 goto part1_done;
129 default:
130 TEST_FAIL("Unknown ucall %lu", uc.cmd);
131 }
132
133 /* UCALL_SYNC is handled here. */
134 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
135 uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
136 stage, (ulong)uc.args[1]);
137
138 state = vcpu_save_state(vm, VCPU_ID);
139 memset(®s1, 0, sizeof(regs1));
140 vcpu_regs_get(vm, VCPU_ID, ®s1);
141
142 kvm_vm_release(vm);
143
144 /* Restore state in a new VM. */
145 kvm_vm_restart(vm, O_RDWR);
146 vm_vcpu_add(vm, VCPU_ID);
147 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
148 vcpu_enable_evmcs(vm, VCPU_ID);
149 vcpu_load_state(vm, VCPU_ID, state);
150 run = vcpu_state(vm, VCPU_ID);
151 free(state);
152
153 memset(®s2, 0, sizeof(regs2));
154 vcpu_regs_get(vm, VCPU_ID, ®s2);
155 TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)),
156 "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
157 (ulong) regs2.rdi, (ulong) regs2.rsi);
158 }
159
160 part1_done:
161 _vcpu_run(vm, VCPU_ID);
162 TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
163 "Unexpected successful VMEnter with invalid eVMCS pointer!");
164
165 kvm_vm_free(vm);
166 }
167