1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Test for s390x CPU resets
4  *
5  * Copyright (C) 2020, IBM
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 3
17 #define LOCAL_IRQS 32
18 
19 struct kvm_s390_irq buf[VCPU_ID + LOCAL_IRQS];
20 
21 struct kvm_vm *vm;
22 struct kvm_run *run;
23 struct kvm_sync_regs *sync_regs;
24 static uint8_t regs_null[512];
25 
guest_code_initial(void)26 static void guest_code_initial(void)
27 {
28 	/* set several CRs to "safe" value */
29 	unsigned long cr2_59 = 0x10;	/* enable guarded storage */
30 	unsigned long cr8_63 = 0x1;	/* monitor mask = 1 */
31 	unsigned long cr10 = 1;		/* PER START */
32 	unsigned long cr11 = -1;	/* PER END */
33 
34 
35 	/* Dirty registers */
36 	asm volatile (
37 		"	lghi	2,0x11\n"	/* Round toward 0 */
38 		"	sfpc	2\n"		/* set fpc to !=0 */
39 		"	lctlg	2,2,%0\n"
40 		"	lctlg	8,8,%1\n"
41 		"	lctlg	10,10,%2\n"
42 		"	lctlg	11,11,%3\n"
43 		/* now clobber some general purpose regs */
44 		"	llihh	0,0xffff\n"
45 		"	llihl	1,0x5555\n"
46 		"	llilh	2,0xaaaa\n"
47 		"	llill	3,0x0000\n"
48 		/* now clobber a floating point reg */
49 		"	lghi	4,0x1\n"
50 		"	cdgbr	0,4\n"
51 		/* now clobber an access reg */
52 		"	sar	9,4\n"
53 		/* We embed diag 501 here to control register content */
54 		"	diag 0,0,0x501\n"
55 		:
56 		: "m" (cr2_59), "m" (cr8_63), "m" (cr10), "m" (cr11)
57 		/* no clobber list as this should not return */
58 		);
59 }
60 
test_one_reg(uint64_t id,uint64_t value)61 static void test_one_reg(uint64_t id, uint64_t value)
62 {
63 	struct kvm_one_reg reg;
64 	uint64_t eval_reg;
65 
66 	reg.addr = (uintptr_t)&eval_reg;
67 	reg.id = id;
68 	vcpu_get_reg(vm, VCPU_ID, &reg);
69 	TEST_ASSERT(eval_reg == value, "value == 0x%lx", value);
70 }
71 
assert_noirq(void)72 static void assert_noirq(void)
73 {
74 	struct kvm_s390_irq_state irq_state;
75 	int irqs;
76 
77 	irq_state.len = sizeof(buf);
78 	irq_state.buf = (unsigned long)buf;
79 	irqs = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_GET_IRQ_STATE, &irq_state);
80 	/*
81 	 * irqs contains the number of retrieved interrupts. Any interrupt
82 	 * (notably, the emergency call interrupt we have injected) should
83 	 * be cleared by the resets, so this should be 0.
84 	 */
85 	TEST_ASSERT(irqs >= 0, "Could not fetch IRQs: errno %d\n", errno);
86 	TEST_ASSERT(!irqs, "IRQ pending");
87 }
88 
assert_clear(void)89 static void assert_clear(void)
90 {
91 	struct kvm_sregs sregs;
92 	struct kvm_regs regs;
93 	struct kvm_fpu fpu;
94 
95 	vcpu_regs_get(vm, VCPU_ID, &regs);
96 	TEST_ASSERT(!memcmp(&regs.gprs, regs_null, sizeof(regs.gprs)), "grs == 0");
97 
98 	vcpu_sregs_get(vm, VCPU_ID, &sregs);
99 	TEST_ASSERT(!memcmp(&sregs.acrs, regs_null, sizeof(sregs.acrs)), "acrs == 0");
100 
101 	vcpu_fpu_get(vm, VCPU_ID, &fpu);
102 	TEST_ASSERT(!memcmp(&fpu.fprs, regs_null, sizeof(fpu.fprs)), "fprs == 0");
103 
104 	/* sync regs */
105 	TEST_ASSERT(!memcmp(sync_regs->gprs, regs_null, sizeof(sync_regs->gprs)),
106 		    "gprs0-15 == 0 (sync_regs)");
107 
108 	TEST_ASSERT(!memcmp(sync_regs->acrs, regs_null, sizeof(sync_regs->acrs)),
109 		    "acrs0-15 == 0 (sync_regs)");
110 
111 	TEST_ASSERT(!memcmp(sync_regs->vrs, regs_null, sizeof(sync_regs->vrs)),
112 		    "vrs0-15 == 0 (sync_regs)");
113 }
114 
assert_initial_noclear(void)115 static void assert_initial_noclear(void)
116 {
117 	TEST_ASSERT(sync_regs->gprs[0] == 0xffff000000000000UL,
118 		    "gpr0 == 0xffff000000000000 (sync_regs)");
119 	TEST_ASSERT(sync_regs->gprs[1] == 0x0000555500000000UL,
120 		    "gpr1 == 0x0000555500000000 (sync_regs)");
121 	TEST_ASSERT(sync_regs->gprs[2] == 0x00000000aaaa0000UL,
122 		    "gpr2 == 0x00000000aaaa0000 (sync_regs)");
123 	TEST_ASSERT(sync_regs->gprs[3] == 0x0000000000000000UL,
124 		    "gpr3 == 0x0000000000000000 (sync_regs)");
125 	TEST_ASSERT(sync_regs->fprs[0] == 0x3ff0000000000000UL,
126 		    "fpr0 == 0f1 (sync_regs)");
127 	TEST_ASSERT(sync_regs->acrs[9] == 1, "ar9 == 1 (sync_regs)");
128 }
129 
assert_initial(void)130 static void assert_initial(void)
131 {
132 	struct kvm_sregs sregs;
133 	struct kvm_fpu fpu;
134 
135 	/* KVM_GET_SREGS */
136 	vcpu_sregs_get(vm, VCPU_ID, &sregs);
137 	TEST_ASSERT(sregs.crs[0] == 0xE0UL, "cr0 == 0xE0 (KVM_GET_SREGS)");
138 	TEST_ASSERT(sregs.crs[14] == 0xC2000000UL,
139 		    "cr14 == 0xC2000000 (KVM_GET_SREGS)");
140 	TEST_ASSERT(!memcmp(&sregs.crs[1], regs_null, sizeof(sregs.crs[1]) * 12),
141 		    "cr1-13 == 0 (KVM_GET_SREGS)");
142 	TEST_ASSERT(sregs.crs[15] == 0, "cr15 == 0 (KVM_GET_SREGS)");
143 
144 	/* sync regs */
145 	TEST_ASSERT(sync_regs->crs[0] == 0xE0UL, "cr0 == 0xE0 (sync_regs)");
146 	TEST_ASSERT(sync_regs->crs[14] == 0xC2000000UL,
147 		    "cr14 == 0xC2000000 (sync_regs)");
148 	TEST_ASSERT(!memcmp(&sync_regs->crs[1], regs_null, 8 * 12),
149 		    "cr1-13 == 0 (sync_regs)");
150 	TEST_ASSERT(sync_regs->crs[15] == 0, "cr15 == 0 (sync_regs)");
151 	TEST_ASSERT(sync_regs->fpc == 0, "fpc == 0 (sync_regs)");
152 	TEST_ASSERT(sync_regs->todpr == 0, "todpr == 0 (sync_regs)");
153 	TEST_ASSERT(sync_regs->cputm == 0, "cputm == 0 (sync_regs)");
154 	TEST_ASSERT(sync_regs->ckc == 0, "ckc == 0 (sync_regs)");
155 	TEST_ASSERT(sync_regs->pp == 0, "pp == 0 (sync_regs)");
156 	TEST_ASSERT(sync_regs->gbea == 1, "gbea == 1 (sync_regs)");
157 
158 	/* kvm_run */
159 	TEST_ASSERT(run->psw_addr == 0, "psw_addr == 0 (kvm_run)");
160 	TEST_ASSERT(run->psw_mask == 0, "psw_mask == 0 (kvm_run)");
161 
162 	vcpu_fpu_get(vm, VCPU_ID, &fpu);
163 	TEST_ASSERT(!fpu.fpc, "fpc == 0");
164 
165 	test_one_reg(KVM_REG_S390_GBEA, 1);
166 	test_one_reg(KVM_REG_S390_PP, 0);
167 	test_one_reg(KVM_REG_S390_TODPR, 0);
168 	test_one_reg(KVM_REG_S390_CPU_TIMER, 0);
169 	test_one_reg(KVM_REG_S390_CLOCK_COMP, 0);
170 }
171 
assert_normal_noclear(void)172 static void assert_normal_noclear(void)
173 {
174 	TEST_ASSERT(sync_regs->crs[2] == 0x10, "cr2 == 10 (sync_regs)");
175 	TEST_ASSERT(sync_regs->crs[8] == 1, "cr10 == 1 (sync_regs)");
176 	TEST_ASSERT(sync_regs->crs[10] == 1, "cr10 == 1 (sync_regs)");
177 	TEST_ASSERT(sync_regs->crs[11] == -1, "cr11 == -1 (sync_regs)");
178 }
179 
assert_normal(void)180 static void assert_normal(void)
181 {
182 	test_one_reg(KVM_REG_S390_PFTOKEN, KVM_S390_PFAULT_TOKEN_INVALID);
183 	TEST_ASSERT(sync_regs->pft == KVM_S390_PFAULT_TOKEN_INVALID,
184 			"pft == 0xff.....  (sync_regs)");
185 	assert_noirq();
186 }
187 
inject_irq(int cpu_id)188 static void inject_irq(int cpu_id)
189 {
190 	struct kvm_s390_irq_state irq_state;
191 	struct kvm_s390_irq *irq = &buf[0];
192 	int irqs;
193 
194 	/* Inject IRQ */
195 	irq_state.len = sizeof(struct kvm_s390_irq);
196 	irq_state.buf = (unsigned long)buf;
197 	irq->type = KVM_S390_INT_EMERGENCY;
198 	irq->u.emerg.code = cpu_id;
199 	irqs = _vcpu_ioctl(vm, cpu_id, KVM_S390_SET_IRQ_STATE, &irq_state);
200 	TEST_ASSERT(irqs >= 0, "Error injecting EMERGENCY IRQ errno %d\n", errno);
201 }
202 
test_normal(void)203 static void test_normal(void)
204 {
205 	pr_info("Testing normal reset\n");
206 	/* Create VM */
207 	vm = vm_create_default(VCPU_ID, 0, guest_code_initial);
208 	run = vcpu_state(vm, VCPU_ID);
209 	sync_regs = &run->s.regs;
210 
211 	vcpu_run(vm, VCPU_ID);
212 
213 	inject_irq(VCPU_ID);
214 
215 	vcpu_ioctl(vm, VCPU_ID, KVM_S390_NORMAL_RESET, 0);
216 
217 	/* must clears */
218 	assert_normal();
219 	/* must not clears */
220 	assert_normal_noclear();
221 	assert_initial_noclear();
222 
223 	kvm_vm_free(vm);
224 }
225 
test_initial(void)226 static void test_initial(void)
227 {
228 	pr_info("Testing initial reset\n");
229 	vm = vm_create_default(VCPU_ID, 0, guest_code_initial);
230 	run = vcpu_state(vm, VCPU_ID);
231 	sync_regs = &run->s.regs;
232 
233 	vcpu_run(vm, VCPU_ID);
234 
235 	inject_irq(VCPU_ID);
236 
237 	vcpu_ioctl(vm, VCPU_ID, KVM_S390_INITIAL_RESET, 0);
238 
239 	/* must clears */
240 	assert_normal();
241 	assert_initial();
242 	/* must not clears */
243 	assert_initial_noclear();
244 
245 	kvm_vm_free(vm);
246 }
247 
test_clear(void)248 static void test_clear(void)
249 {
250 	pr_info("Testing clear reset\n");
251 	vm = vm_create_default(VCPU_ID, 0, guest_code_initial);
252 	run = vcpu_state(vm, VCPU_ID);
253 	sync_regs = &run->s.regs;
254 
255 	vcpu_run(vm, VCPU_ID);
256 
257 	inject_irq(VCPU_ID);
258 
259 	vcpu_ioctl(vm, VCPU_ID, KVM_S390_CLEAR_RESET, 0);
260 
261 	/* must clears */
262 	assert_normal();
263 	assert_initial();
264 	assert_clear();
265 
266 	kvm_vm_free(vm);
267 }
268 
main(int argc,char * argv[])269 int main(int argc, char *argv[])
270 {
271 	setbuf(stdout, NULL);	/* Tell stdout not to buffer its content */
272 
273 	test_initial();
274 	if (kvm_check_cap(KVM_CAP_S390_VCPU_RESETS)) {
275 		test_normal();
276 		test_clear();
277 	}
278 	return 0;
279 }
280