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 2022 Oxide Computer Company
14 */
15
16 #include <stdio.h>
17 #include <unistd.h>
18 #include <stdlib.h>
19 #include <strings.h>
20 #include <libgen.h>
21 #include <assert.h>
22 #include <errno.h>
23
24 #include <sys/types.h>
25 #include <sys/sysmacros.h>
26 #include <sys/debug.h>
27 #include <sys/vmm.h>
28 #include <sys/vmm_dev.h>
29 #include <vmmapi.h>
30
31 #include "in_guest.h"
32
33 #define MMIO_TEST_BASE 0x10001000
34 #define MMIO_TEST_END 0x10002000
35
36 static bool
handle_test_mmio(const struct vm_exit * vexit,struct vm_entry * ventry)37 handle_test_mmio(const struct vm_exit *vexit, struct vm_entry *ventry)
38 {
39 /* expecting only reads */
40 if (vexit->u.mmio.read == 0) {
41 return (false);
42 }
43
44 /* expecting only in the [0x10001000 - 0x10002000) range */
45 if (vexit->u.mmio.gpa < MMIO_TEST_BASE ||
46 vexit->u.mmio.gpa >= MMIO_TEST_END) {
47 return (false);
48 }
49
50 /*
51 * Emit a pattern of the lowest 16 bits of the address, ascending by the
52 * 2-byte stride for every 2 additional bytes, as the result.
53 *
54 * For example, an 8-byte read of 0x00001234 would result in:
55 * 0x123a123812361234 being returned
56 */
57 const uint16_t addr = vexit->u.mmio.gpa;
58 uint64_t val = 0;
59 switch (vexit->u.mmio.bytes) {
60 case 8:
61 val |= (uint64_t)(addr + 6) << 48;
62 val |= (uint64_t)(addr + 4) << 32;
63 /* FALLTHROUGH */
64 case 4:
65 val |= (uint32_t)(addr + 2) << 16;
66 /* FALLTHROUGH */
67 case 2:
68 val |= addr;
69 break;
70 default:
71 /* expect only 2/4/8-byte reads */
72 return (false);
73 }
74
75 ventry_fulfill_mmio(vexit, ventry, val);
76 return (true);
77 }
78
79 int
main(int argc,char * argv[])80 main(int argc, char *argv[])
81 {
82 const char *test_suite_name = basename(argv[0]);
83 struct vmctx *ctx = NULL;
84 struct vcpu *vcpu;
85 int err;
86
87 ctx = test_initialize(test_suite_name);
88
89 if ((vcpu = vm_vcpu_open(ctx, 0)) == NULL) {
90 test_fail_errno(errno, "Could not open vcpu0");
91 }
92
93 err = test_setup_vcpu(vcpu, MEM_LOC_PAYLOAD, MEM_LOC_STACK);
94 if (err != 0) {
95 test_fail_errno(err, "Could not initialize vcpu0");
96 }
97
98 struct vm_entry ventry = { 0 };
99 struct vm_exit vexit = { 0 };
100
101 do {
102 const enum vm_exit_kind kind =
103 test_run_vcpu(vcpu, &ventry, &vexit);
104 switch (kind) {
105 case VEK_REENTR:
106 break;
107 case VEK_UNHANDLED:
108 if (!handle_test_mmio(&vexit, &ventry)) {
109 test_fail_vmexit(&vexit);
110 }
111 break;
112 case VEK_TEST_PASS:
113 test_pass();
114 break;
115 case VEK_TEST_FAIL:
116 default:
117 test_fail_vmexit(&vexit);
118 break;
119 }
120 } while (true);
121 }
122