1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Test for s390x KVM_CAP_SYNC_REGS
4 *
5 * Based on the same test for x86:
6 * Copyright (C) 2018, Google LLC.
7 *
8 * Adaptions for s390x:
9 * Copyright (C) 2019, Red Hat, Inc.
10 *
11 * Test expected behavior of the KVM_CAP_SYNC_REGS functionality.
12 */
13
14 #define _GNU_SOURCE /* for program_invocation_short_name */
15 #include <fcntl.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <sys/ioctl.h>
20
21 #include "test_util.h"
22 #include "kvm_util.h"
23 #include "diag318_test_handler.h"
24 #include "kselftest.h"
25
guest_code(void)26 static void guest_code(void)
27 {
28 /*
29 * We embed diag 501 here instead of doing a ucall to avoid that
30 * the compiler has messed with r11 at the time of the ucall.
31 */
32 asm volatile (
33 "0: diag 0,0,0x501\n"
34 " ahi 11,1\n"
35 " j 0b\n"
36 );
37 }
38
39 #define REG_COMPARE(reg) \
40 TEST_ASSERT(left->reg == right->reg, \
41 "Register " #reg \
42 " values did not match: 0x%llx, 0x%llx\n", \
43 left->reg, right->reg)
44
45 #define REG_COMPARE32(reg) \
46 TEST_ASSERT(left->reg == right->reg, \
47 "Register " #reg \
48 " values did not match: 0x%x, 0x%x\n", \
49 left->reg, right->reg)
50
51
compare_regs(struct kvm_regs * left,struct kvm_sync_regs * right)52 static void compare_regs(struct kvm_regs *left, struct kvm_sync_regs *right)
53 {
54 int i;
55
56 for (i = 0; i < 16; i++)
57 REG_COMPARE(gprs[i]);
58 }
59
compare_sregs(struct kvm_sregs * left,struct kvm_sync_regs * right)60 static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)
61 {
62 int i;
63
64 for (i = 0; i < 16; i++)
65 REG_COMPARE32(acrs[i]);
66
67 for (i = 0; i < 16; i++)
68 REG_COMPARE(crs[i]);
69 }
70
71 #undef REG_COMPARE
72
73 #define TEST_SYNC_FIELDS (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS|KVM_SYNC_DIAG318)
74 #define INVALID_SYNC_FIELD 0x80000000
75
test_read_invalid(struct kvm_vcpu * vcpu)76 void test_read_invalid(struct kvm_vcpu *vcpu)
77 {
78 struct kvm_run *run = vcpu->run;
79 int rv;
80
81 /* Request reading invalid register set from VCPU. */
82 run->kvm_valid_regs = INVALID_SYNC_FIELD;
83 rv = _vcpu_run(vcpu);
84 TEST_ASSERT(rv < 0 && errno == EINVAL,
85 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
86 rv);
87 run->kvm_valid_regs = 0;
88
89 run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
90 rv = _vcpu_run(vcpu);
91 TEST_ASSERT(rv < 0 && errno == EINVAL,
92 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
93 rv);
94 run->kvm_valid_regs = 0;
95 }
96
test_set_invalid(struct kvm_vcpu * vcpu)97 void test_set_invalid(struct kvm_vcpu *vcpu)
98 {
99 struct kvm_run *run = vcpu->run;
100 int rv;
101
102 /* Request setting invalid register set into VCPU. */
103 run->kvm_dirty_regs = INVALID_SYNC_FIELD;
104 rv = _vcpu_run(vcpu);
105 TEST_ASSERT(rv < 0 && errno == EINVAL,
106 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
107 rv);
108 run->kvm_dirty_regs = 0;
109
110 run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
111 rv = _vcpu_run(vcpu);
112 TEST_ASSERT(rv < 0 && errno == EINVAL,
113 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
114 rv);
115 run->kvm_dirty_regs = 0;
116 }
117
test_req_and_verify_all_valid_regs(struct kvm_vcpu * vcpu)118 void test_req_and_verify_all_valid_regs(struct kvm_vcpu *vcpu)
119 {
120 struct kvm_run *run = vcpu->run;
121 struct kvm_sregs sregs;
122 struct kvm_regs regs;
123 int rv;
124
125 /* Request and verify all valid register sets. */
126 run->kvm_valid_regs = TEST_SYNC_FIELDS;
127 rv = _vcpu_run(vcpu);
128 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
129 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
130 TEST_ASSERT(run->s390_sieic.icptcode == 4 &&
131 (run->s390_sieic.ipa >> 8) == 0x83 &&
132 (run->s390_sieic.ipb >> 16) == 0x501,
133 "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x\n",
134 run->s390_sieic.icptcode, run->s390_sieic.ipa,
135 run->s390_sieic.ipb);
136
137 vcpu_regs_get(vcpu, ®s);
138 compare_regs(®s, &run->s.regs);
139
140 vcpu_sregs_get(vcpu, &sregs);
141 compare_sregs(&sregs, &run->s.regs);
142 }
143
test_set_and_verify_various_reg_values(struct kvm_vcpu * vcpu)144 void test_set_and_verify_various_reg_values(struct kvm_vcpu *vcpu)
145 {
146 struct kvm_run *run = vcpu->run;
147 struct kvm_sregs sregs;
148 struct kvm_regs regs;
149 int rv;
150
151 /* Set and verify various register values */
152 run->s.regs.gprs[11] = 0xBAD1DEA;
153 run->s.regs.acrs[0] = 1 << 11;
154
155 run->kvm_valid_regs = TEST_SYNC_FIELDS;
156 run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;
157
158 if (get_diag318_info() > 0) {
159 run->s.regs.diag318 = get_diag318_info();
160 run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
161 }
162
163 rv = _vcpu_run(vcpu);
164 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
165 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
166 TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1,
167 "r11 sync regs value incorrect 0x%llx.",
168 run->s.regs.gprs[11]);
169 TEST_ASSERT(run->s.regs.acrs[0] == 1 << 11,
170 "acr0 sync regs value incorrect 0x%x.",
171 run->s.regs.acrs[0]);
172 TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(),
173 "diag318 sync regs value incorrect 0x%llx.",
174 run->s.regs.diag318);
175
176 vcpu_regs_get(vcpu, ®s);
177 compare_regs(®s, &run->s.regs);
178
179 vcpu_sregs_get(vcpu, &sregs);
180 compare_sregs(&sregs, &run->s.regs);
181 }
182
test_clear_kvm_dirty_regs_bits(struct kvm_vcpu * vcpu)183 void test_clear_kvm_dirty_regs_bits(struct kvm_vcpu *vcpu)
184 {
185 struct kvm_run *run = vcpu->run;
186 int rv;
187
188 /* Clear kvm_dirty_regs bits, verify new s.regs values are
189 * overwritten with existing guest values.
190 */
191 run->kvm_valid_regs = TEST_SYNC_FIELDS;
192 run->kvm_dirty_regs = 0;
193 run->s.regs.gprs[11] = 0xDEADBEEF;
194 run->s.regs.diag318 = 0x4B1D;
195 rv = _vcpu_run(vcpu);
196 TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
197 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
198 TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,
199 "r11 sync regs value incorrect 0x%llx.",
200 run->s.regs.gprs[11]);
201 TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,
202 "diag318 sync regs value incorrect 0x%llx.",
203 run->s.regs.diag318);
204 }
205
206 struct testdef {
207 const char *name;
208 void (*test)(struct kvm_vcpu *vcpu);
209 } testlist[] = {
210 { "read invalid", test_read_invalid },
211 { "set invalid", test_set_invalid },
212 { "request+verify all valid regs", test_req_and_verify_all_valid_regs },
213 { "set+verify various regs", test_set_and_verify_various_reg_values },
214 { "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits },
215 };
216
main(int argc,char * argv[])217 int main(int argc, char *argv[])
218 {
219 struct kvm_vcpu *vcpu;
220 struct kvm_vm *vm;
221 int idx;
222
223 TEST_REQUIRE(kvm_has_cap(KVM_CAP_SYNC_REGS));
224
225 ksft_print_header();
226
227 ksft_set_plan(ARRAY_SIZE(testlist));
228
229 /* Create VM */
230 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
231
232 for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) {
233 testlist[idx].test(vcpu);
234 ksft_test_result_pass("%s\n", testlist[idx].name);
235 }
236
237 kvm_vm_free(vm);
238
239 ksft_finished(); /* Print results and exit() accordingly */
240 }
241