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 guest writes to the TSC
18 */
19
20 #include <unistd.h>
21 #include <stdlib.h>
22 #include <libgen.h>
23 #include <errno.h>
24 #include <err.h>
25
26 #include <sys/vmm_data.h>
27 #include <sys/vmm_dev.h>
28 #include <vmmapi.h>
29
30 #include "in_guest.h"
31 #include "test_defs.h"
32
33 int
main(int argc,char * argv[])34 main(int argc, char *argv[])
35 {
36 const char *test_suite_name = basename(argv[0]);
37 struct vmctx *ctx = NULL;
38 struct vcpu *vcpu;
39 int err;
40
41 ctx = test_initialize(test_suite_name);
42
43 if ((vcpu = vm_vcpu_open(ctx, 0)) == NULL) {
44 test_fail_errno(errno, "Could not open vcpu0");
45 }
46
47 err = test_setup_vcpu(vcpu, MEM_LOC_PAYLOAD, MEM_LOC_STACK);
48 if (err != 0) {
49 test_fail_errno(err, "Could not initialize vcpu0");
50 }
51
52 struct vm_entry ventry = { 0 }; struct vm_exit vexit = { 0 };
53 bool half_read = false;
54 uint64_t tsc;
55
56 do {
57 const enum vm_exit_kind kind =
58 test_run_vcpu(vcpu, &ventry, &vexit);
59
60 if (kind == VEK_REENTR) {
61 continue;
62 } else if (kind != VEK_UNHANDLED) {
63 test_fail_vmexit(&vexit);
64 }
65
66 uint32_t val;
67 if (vexit_match_inout(&vexit, false, IOP_TEST_VALUE, 4,
68 &val)) {
69 if (!half_read) {
70 /* low 32-bits of TSC first */
71 tsc = val;
72 half_read = true;
73 ventry_fulfill_inout(&vexit, &ventry, 0);
74 } else {
75 /* high 32-bits of TSC */
76 tsc |= ((uint64_t)val << 32);
77
78 /*
79 * Check that the TSC reading is at least the
80 * high value it was set to by the guest.
81 *
82 * If we wanted to be more precise about it, we
83 * could get the host frequency and calculate
84 * ppm error.
85 *
86 */
87 if (tsc < TSC_TARGET_WRVAL) {
88 test_fail_msg("TSC %lu < %lu", tsc,
89 TSC_TARGET_WRVAL);
90 } else {
91 test_pass();
92 }
93 }
94 } else {
95 test_fail_vmexit(&vexit);
96 }
97 } while (true);
98 }
99