1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Test for s390x KVM_S390_MEM_OP
4 *
5 * Copyright (C) 2019, Red Hat, Inc.
6 */
7
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <sys/ioctl.h>
12
13 #include "test_util.h"
14 #include "kvm_util.h"
15
16 #define VCPU_ID 1
17
18 static uint8_t mem1[65536];
19 static uint8_t mem2[65536];
20
guest_code(void)21 static void guest_code(void)
22 {
23 int i;
24
25 for (;;) {
26 for (i = 0; i < sizeof(mem2); i++)
27 mem2[i] = mem1[i];
28 GUEST_SYNC(0);
29 }
30 }
31
main(int argc,char * argv[])32 int main(int argc, char *argv[])
33 {
34 struct kvm_vm *vm;
35 struct kvm_run *run;
36 struct kvm_s390_mem_op ksmo;
37 int rv, i, maxsize;
38
39 setbuf(stdout, NULL); /* Tell stdout not to buffer its content */
40
41 maxsize = kvm_check_cap(KVM_CAP_S390_MEM_OP);
42 if (!maxsize) {
43 fprintf(stderr, "CAP_S390_MEM_OP not supported -> skip test\n");
44 exit(KSFT_SKIP);
45 }
46 if (maxsize > sizeof(mem1))
47 maxsize = sizeof(mem1);
48
49 /* Create VM */
50 vm = vm_create_default(VCPU_ID, 0, guest_code);
51 run = vcpu_state(vm, VCPU_ID);
52
53 for (i = 0; i < sizeof(mem1); i++)
54 mem1[i] = i * i + i;
55
56 /* Set the first array */
57 ksmo.gaddr = addr_gva2gpa(vm, (uintptr_t)mem1);
58 ksmo.flags = 0;
59 ksmo.size = maxsize;
60 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
61 ksmo.buf = (uintptr_t)mem1;
62 ksmo.ar = 0;
63 vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
64
65 /* Let the guest code copy the first array to the second */
66 vcpu_run(vm, VCPU_ID);
67 TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
68 "Unexpected exit reason: %u (%s)\n",
69 run->exit_reason,
70 exit_reason_str(run->exit_reason));
71
72 memset(mem2, 0xaa, sizeof(mem2));
73
74 /* Get the second array */
75 ksmo.gaddr = (uintptr_t)mem2;
76 ksmo.flags = 0;
77 ksmo.size = maxsize;
78 ksmo.op = KVM_S390_MEMOP_LOGICAL_READ;
79 ksmo.buf = (uintptr_t)mem2;
80 ksmo.ar = 0;
81 vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
82
83 TEST_ASSERT(!memcmp(mem1, mem2, maxsize),
84 "Memory contents do not match!");
85
86 /* Check error conditions - first bad size: */
87 ksmo.gaddr = (uintptr_t)mem1;
88 ksmo.flags = 0;
89 ksmo.size = -1;
90 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
91 ksmo.buf = (uintptr_t)mem1;
92 ksmo.ar = 0;
93 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
94 TEST_ASSERT(rv == -1 && errno == E2BIG, "ioctl allows insane sizes");
95
96 /* Zero size: */
97 ksmo.gaddr = (uintptr_t)mem1;
98 ksmo.flags = 0;
99 ksmo.size = 0;
100 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
101 ksmo.buf = (uintptr_t)mem1;
102 ksmo.ar = 0;
103 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
104 TEST_ASSERT(rv == -1 && (errno == EINVAL || errno == ENOMEM),
105 "ioctl allows 0 as size");
106
107 /* Bad flags: */
108 ksmo.gaddr = (uintptr_t)mem1;
109 ksmo.flags = -1;
110 ksmo.size = maxsize;
111 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
112 ksmo.buf = (uintptr_t)mem1;
113 ksmo.ar = 0;
114 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
115 TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows all flags");
116
117 /* Bad operation: */
118 ksmo.gaddr = (uintptr_t)mem1;
119 ksmo.flags = 0;
120 ksmo.size = maxsize;
121 ksmo.op = -1;
122 ksmo.buf = (uintptr_t)mem1;
123 ksmo.ar = 0;
124 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
125 TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows bad operations");
126
127 /* Bad guest address: */
128 ksmo.gaddr = ~0xfffUL;
129 ksmo.flags = KVM_S390_MEMOP_F_CHECK_ONLY;
130 ksmo.size = maxsize;
131 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
132 ksmo.buf = (uintptr_t)mem1;
133 ksmo.ar = 0;
134 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
135 TEST_ASSERT(rv > 0, "ioctl does not report bad guest memory access");
136
137 /* Bad host address: */
138 ksmo.gaddr = (uintptr_t)mem1;
139 ksmo.flags = 0;
140 ksmo.size = maxsize;
141 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
142 ksmo.buf = 0;
143 ksmo.ar = 0;
144 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
145 TEST_ASSERT(rv == -1 && errno == EFAULT,
146 "ioctl does not report bad host memory address");
147
148 /* Bad access register: */
149 run->psw_mask &= ~(3UL << (63 - 17));
150 run->psw_mask |= 1UL << (63 - 17); /* Enable AR mode */
151 vcpu_run(vm, VCPU_ID); /* To sync new state to SIE block */
152 ksmo.gaddr = (uintptr_t)mem1;
153 ksmo.flags = 0;
154 ksmo.size = maxsize;
155 ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
156 ksmo.buf = (uintptr_t)mem1;
157 ksmo.ar = 17;
158 rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
159 TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows ARs > 15");
160 run->psw_mask &= ~(3UL << (63 - 17)); /* Disable AR mode */
161 vcpu_run(vm, VCPU_ID); /* Run to sync new state */
162
163 kvm_vm_free(vm);
164
165 return 0;
166 }
167