1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2023 Oxide Computer Company
14 */
15
16 /*
17 * Test that adjusting the guest TSC with VMM time data interface is visible
18 * in guest.
19 *
20 * Note: requires `vmm_allow_state_writes` to be set
21 */
22
23 #include <unistd.h>
24 #include <stdlib.h>
25 #include <libgen.h>
26 #include <errno.h>
27 #include <err.h>
28
29 #include <sys/vmm_data.h>
30 #include <sys/vmm_dev.h>
31 #include <vmmapi.h>
32
33 #include "in_guest.h"
34
35 int
main(int argc,char * argv[])36 main(int argc, char *argv[])
37 {
38 const char *test_suite_name = basename(argv[0]);
39 struct vmctx *ctx = NULL;
40 struct vcpu *vcpu;
41 int err;
42
43 ctx = test_initialize(test_suite_name);
44
45 if ((vcpu = vm_vcpu_open(ctx, 0)) == NULL) {
46 test_fail_errno(errno, "Could not open vcpu0");
47 }
48
49 err = test_setup_vcpu(vcpu, MEM_LOC_PAYLOAD, MEM_LOC_STACK);
50 if (err != 0) {
51 test_fail_errno(err, "Could not initialize vcpu0");
52 }
53
54 const int vmfd = vm_get_device_fd(ctx);
55
56 /* Read time data to get baseline guest time values */
57 struct vdi_time_info_v1 time_info;
58 struct vm_data_xfer xfer = {
59 .vdx_class = VDC_VMM_TIME,
60 .vdx_version = 1,
61 .vdx_len = sizeof (struct vdi_time_info_v1),
62 .vdx_data = &time_info,
63 };
64 if (ioctl(vmfd, VM_DATA_READ, &xfer) != 0) {
65 errx(EXIT_FAILURE, "VMM_DATA_READ of time info failed");
66 }
67
68 /* Change the guest TSC to a much larger value */
69 uint64_t expect_tsc = 500000000000;
70 time_info.vt_guest_tsc = expect_tsc;
71 if (ioctl(vmfd, VM_DATA_WRITE, &xfer) != 0) {
72 int error;
73 error = errno;
74 if (error == EPERM) {
75 warn("VMM_DATA_WRITE got EPERM: is "
76 "vmm_allow_state_writes set?");
77 }
78 errx(EXIT_FAILURE, "VMM_DATA_WRITE of time info failed");
79 }
80
81 struct vm_entry ventry = { 0 };
82 struct vm_exit vexit = { 0 };
83
84 bool half_read = false;
85 uint64_t tsc;
86
87 do {
88 const enum vm_exit_kind kind =
89 test_run_vcpu(vcpu, &ventry, &vexit);
90
91 if (kind == VEK_REENTR) {
92 continue;
93 } else if (kind != VEK_UNHANDLED) {
94 test_fail_vmexit(&vexit);
95 }
96
97 uint32_t val;
98 if (vexit_match_inout(&vexit, false, IOP_TEST_VALUE, 4,
99 &val)) {
100 if (!half_read) {
101 /* low 32-bits of TSC first */
102 tsc = val;
103 half_read = true;
104 ventry_fulfill_inout(&vexit, &ventry, 0);
105 } else {
106 /* high 32-bits of TSC */
107 tsc |= ((uint64_t)val << 32);
108
109 /*
110 * Check that the TSC reading is at least the
111 * absurdly high value it was set to.
112 */
113 if (tsc >= expect_tsc) {
114 (void) printf("tsc=%ld\n", tsc);
115 test_pass();
116 } else {
117 test_fail_msg("TSC %lu < %lu\n", tsc,
118 expect_tsc);
119 }
120 }
121 } else {
122 test_fail_vmexit(&vexit);
123 }
124 } while (true);
125 }
126