1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Test code for the s390x kvm ucontrol interface
4 *
5 * Copyright IBM Corp. 2024
6 *
7 * Authors:
8 * Christoph Schlameuss <schlameuss@linux.ibm.com>
9 */
10 #include "debug_print.h"
11 #include "kselftest_harness.h"
12 #include "kvm_util.h"
13 #include "processor.h"
14 #include "sie.h"
15
16 #include <linux/capability.h>
17 #include <linux/sizes.h>
18
19 #define PGM_SEGMENT_TRANSLATION 0x10
20
21 #define VM_MEM_SIZE (4 * SZ_1M)
22 #define VM_MEM_EXT_SIZE (2 * SZ_1M)
23 #define VM_MEM_MAX_M ((VM_MEM_SIZE + VM_MEM_EXT_SIZE) / SZ_1M)
24
25 /* so directly declare capget to check caps without libcap */
26 int capget(cap_user_header_t header, cap_user_data_t data);
27
28 /**
29 * In order to create user controlled virtual machines on S390,
30 * check KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL
31 * as privileged user (SYS_ADMIN).
32 */
require_ucontrol_admin(void)33 void require_ucontrol_admin(void)
34 {
35 struct __user_cap_data_struct data[_LINUX_CAPABILITY_U32S_3];
36 struct __user_cap_header_struct hdr = {
37 .version = _LINUX_CAPABILITY_VERSION_3,
38 };
39 int rc;
40
41 rc = capget(&hdr, data);
42 TEST_ASSERT_EQ(0, rc);
43 TEST_REQUIRE((data->effective & CAP_TO_MASK(CAP_SYS_ADMIN)) > 0);
44
45 TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_UCONTROL));
46 }
47
48 /* Test program setting some registers and looping */
49 extern char test_gprs_asm[];
50 asm("test_gprs_asm:\n"
51 "xgr %r0, %r0\n"
52 "lgfi %r1,1\n"
53 "lgfi %r2,2\n"
54 "lgfi %r3,3\n"
55 "lgfi %r4,4\n"
56 "lgfi %r5,5\n"
57 "lgfi %r6,6\n"
58 "lgfi %r7,7\n"
59 "0:\n"
60 " diag 0,0,0x44\n"
61 " ahi %r0,1\n"
62 " j 0b\n"
63 );
64
65 /* Test program manipulating memory */
66 extern char test_mem_asm[];
67 asm("test_mem_asm:\n"
68 "xgr %r0, %r0\n"
69
70 "0:\n"
71 " ahi %r0,1\n"
72 " st %r1,0(%r5,%r6)\n"
73
74 " xgr %r1,%r1\n"
75 " l %r1,0(%r5,%r6)\n"
76 " ahi %r0,1\n"
77 " diag 0,0,0x44\n"
78
79 " j 0b\n"
80 );
81
82 /* Test program manipulating storage keys */
83 extern char test_skey_asm[];
84 asm("test_skey_asm:\n"
85 "xgr %r0, %r0\n"
86
87 "0:\n"
88 " ahi %r0,1\n"
89 " st %r1,0(%r5,%r6)\n"
90
91 " sske %r1,%r6\n"
92 " xgr %r1,%r1\n"
93 " iske %r1,%r6\n"
94 " ahi %r0,1\n"
95 " diag 0,0,0x44\n"
96
97 " rrbe %r1,%r6\n"
98 " iske %r1,%r6\n"
99 " ahi %r0,1\n"
100 " diag 0,0,0x44\n"
101
102 " j 0b\n"
103 );
104
FIXTURE(uc_kvm)105 FIXTURE(uc_kvm)
106 {
107 struct kvm_s390_sie_block *sie_block;
108 struct kvm_run *run;
109 uintptr_t base_gpa;
110 uintptr_t code_gpa;
111 uintptr_t base_hva;
112 uintptr_t code_hva;
113 int kvm_run_size;
114 vm_paddr_t pgd;
115 void *vm_mem;
116 int vcpu_fd;
117 int kvm_fd;
118 int vm_fd;
119 };
120
121 /**
122 * create VM with single vcpu, map kvm_run and SIE control block for easy access
123 */
FIXTURE_SETUP(uc_kvm)124 FIXTURE_SETUP(uc_kvm)
125 {
126 struct kvm_s390_vm_cpu_processor info;
127 int rc;
128
129 require_ucontrol_admin();
130
131 self->kvm_fd = open_kvm_dev_path_or_exit();
132 self->vm_fd = ioctl(self->kvm_fd, KVM_CREATE_VM, KVM_VM_S390_UCONTROL);
133 ASSERT_GE(self->vm_fd, 0);
134
135 kvm_device_attr_get(self->vm_fd, KVM_S390_VM_CPU_MODEL,
136 KVM_S390_VM_CPU_PROCESSOR, &info);
137 TH_LOG("create VM 0x%llx", info.cpuid);
138
139 self->vcpu_fd = ioctl(self->vm_fd, KVM_CREATE_VCPU, 0);
140 ASSERT_GE(self->vcpu_fd, 0);
141
142 self->kvm_run_size = ioctl(self->kvm_fd, KVM_GET_VCPU_MMAP_SIZE, NULL);
143 ASSERT_GE(self->kvm_run_size, sizeof(struct kvm_run))
144 TH_LOG(KVM_IOCTL_ERROR(KVM_GET_VCPU_MMAP_SIZE, self->kvm_run_size));
145 self->run = kvm_mmap(self->kvm_run_size, PROT_READ | PROT_WRITE,
146 MAP_SHARED, self->vcpu_fd);
147 /**
148 * For virtual cpus that have been created with S390 user controlled
149 * virtual machines, the resulting vcpu fd can be memory mapped at page
150 * offset KVM_S390_SIE_PAGE_OFFSET in order to obtain a memory map of
151 * the virtual cpu's hardware control block.
152 */
153 self->sie_block = __kvm_mmap(PAGE_SIZE, PROT_READ | PROT_WRITE,
154 MAP_SHARED, self->vcpu_fd,
155 KVM_S390_SIE_PAGE_OFFSET << PAGE_SHIFT);
156
157 TH_LOG("VM created %p %p", self->run, self->sie_block);
158
159 self->base_gpa = 0;
160 self->code_gpa = self->base_gpa + (3 * SZ_1M);
161
162 self->vm_mem = aligned_alloc(SZ_1M, VM_MEM_MAX_M * SZ_1M);
163 ASSERT_NE(NULL, self->vm_mem) TH_LOG("malloc failed %u", errno);
164 self->base_hva = (uintptr_t)self->vm_mem;
165 self->code_hva = self->base_hva - self->base_gpa + self->code_gpa;
166 struct kvm_s390_ucas_mapping map = {
167 .user_addr = self->base_hva,
168 .vcpu_addr = self->base_gpa,
169 .length = VM_MEM_SIZE,
170 };
171 TH_LOG("ucas map %p %p 0x%llx",
172 (void *)map.user_addr, (void *)map.vcpu_addr, map.length);
173 rc = ioctl(self->vcpu_fd, KVM_S390_UCAS_MAP, &map);
174 ASSERT_EQ(0, rc) TH_LOG("ucas map result %d not expected, %s",
175 rc, strerror(errno));
176
177 TH_LOG("page in %p", (void *)self->base_gpa);
178 rc = ioctl(self->vcpu_fd, KVM_S390_VCPU_FAULT, self->base_gpa);
179 ASSERT_EQ(0, rc) TH_LOG("vcpu fault (%p) result %d not expected, %s",
180 (void *)self->base_hva, rc, strerror(errno));
181
182 self->sie_block->cpuflags &= ~CPUSTAT_STOPPED;
183 }
184
FIXTURE_TEARDOWN(uc_kvm)185 FIXTURE_TEARDOWN(uc_kvm)
186 {
187 kvm_munmap(self->sie_block, PAGE_SIZE);
188 kvm_munmap(self->run, self->kvm_run_size);
189 close(self->vcpu_fd);
190 close(self->vm_fd);
191 close(self->kvm_fd);
192 free(self->vm_mem);
193 }
194
TEST_F(uc_kvm,uc_sie_assertions)195 TEST_F(uc_kvm, uc_sie_assertions)
196 {
197 /* assert interception of Code 08 (Program Interruption) is set */
198 EXPECT_EQ(0, self->sie_block->ecb & ECB_SPECI);
199 }
200
TEST_F(uc_kvm,uc_attr_mem_limit)201 TEST_F(uc_kvm, uc_attr_mem_limit)
202 {
203 u64 limit;
204 struct kvm_device_attr attr = {
205 .group = KVM_S390_VM_MEM_CTRL,
206 .attr = KVM_S390_VM_MEM_LIMIT_SIZE,
207 .addr = (u64)&limit,
208 };
209 int rc;
210
211 rc = ioctl(self->vm_fd, KVM_HAS_DEVICE_ATTR, &attr);
212 EXPECT_EQ(0, rc);
213
214 rc = ioctl(self->vm_fd, KVM_GET_DEVICE_ATTR, &attr);
215 EXPECT_EQ(0, rc);
216 EXPECT_EQ(~0UL, limit);
217
218 /* assert set not supported */
219 rc = ioctl(self->vm_fd, KVM_SET_DEVICE_ATTR, &attr);
220 EXPECT_EQ(-1, rc);
221 EXPECT_EQ(EINVAL, errno);
222 }
223
TEST_F(uc_kvm,uc_no_dirty_log)224 TEST_F(uc_kvm, uc_no_dirty_log)
225 {
226 struct kvm_dirty_log dlog;
227 int rc;
228
229 rc = ioctl(self->vm_fd, KVM_GET_DIRTY_LOG, &dlog);
230 EXPECT_EQ(-1, rc);
231 EXPECT_EQ(EINVAL, errno);
232 }
233
234 /**
235 * Assert HPAGE CAP cannot be enabled on UCONTROL VM
236 */
TEST(uc_cap_hpage)237 TEST(uc_cap_hpage)
238 {
239 int rc, kvm_fd, vm_fd, vcpu_fd;
240 struct kvm_enable_cap cap = {
241 .cap = KVM_CAP_S390_HPAGE_1M,
242 };
243
244 require_ucontrol_admin();
245
246 kvm_fd = open_kvm_dev_path_or_exit();
247 vm_fd = ioctl(kvm_fd, KVM_CREATE_VM, KVM_VM_S390_UCONTROL);
248 ASSERT_GE(vm_fd, 0);
249
250 /* assert hpages are not supported on ucontrol vm */
251 rc = ioctl(vm_fd, KVM_CHECK_EXTENSION, KVM_CAP_S390_HPAGE_1M);
252 EXPECT_EQ(0, rc);
253
254 /* Test that KVM_CAP_S390_HPAGE_1M can't be enabled for a ucontrol vm */
255 rc = ioctl(vm_fd, KVM_ENABLE_CAP, cap);
256 EXPECT_EQ(-1, rc);
257 EXPECT_EQ(EINVAL, errno);
258
259 /* assert HPAGE CAP is rejected after vCPU creation */
260 vcpu_fd = ioctl(vm_fd, KVM_CREATE_VCPU, 0);
261 ASSERT_GE(vcpu_fd, 0);
262 rc = ioctl(vm_fd, KVM_ENABLE_CAP, cap);
263 EXPECT_EQ(-1, rc);
264 EXPECT_EQ(EBUSY, errno);
265
266 close(vcpu_fd);
267 close(vm_fd);
268 close(kvm_fd);
269 }
270
271 /* calculate host virtual addr from guest physical addr */
gpa2hva(FIXTURE_DATA (uc_kvm)* self,u64 gpa)272 static void *gpa2hva(FIXTURE_DATA(uc_kvm) *self, u64 gpa)
273 {
274 return (void *)(self->base_hva - self->base_gpa + gpa);
275 }
276
277 /* map / make additional memory available */
uc_map_ext(FIXTURE_DATA (uc_kvm)* self,u64 vcpu_addr,u64 length)278 static int uc_map_ext(FIXTURE_DATA(uc_kvm) *self, u64 vcpu_addr, u64 length)
279 {
280 struct kvm_s390_ucas_mapping map = {
281 .user_addr = (u64)gpa2hva(self, vcpu_addr),
282 .vcpu_addr = vcpu_addr,
283 .length = length,
284 };
285 pr_info("ucas map %p %p 0x%llx",
286 (void *)map.user_addr, (void *)map.vcpu_addr, map.length);
287 return ioctl(self->vcpu_fd, KVM_S390_UCAS_MAP, &map);
288 }
289
290 /* unmap previously mapped memory */
uc_unmap_ext(FIXTURE_DATA (uc_kvm)* self,u64 vcpu_addr,u64 length)291 static int uc_unmap_ext(FIXTURE_DATA(uc_kvm) *self, u64 vcpu_addr, u64 length)
292 {
293 struct kvm_s390_ucas_mapping map = {
294 .user_addr = (u64)gpa2hva(self, vcpu_addr),
295 .vcpu_addr = vcpu_addr,
296 .length = length,
297 };
298 pr_info("ucas unmap %p %p 0x%llx",
299 (void *)map.user_addr, (void *)map.vcpu_addr, map.length);
300 return ioctl(self->vcpu_fd, KVM_S390_UCAS_UNMAP, &map);
301 }
302
303 /* handle ucontrol exit by mapping the accessed segment */
uc_handle_exit_ucontrol(FIXTURE_DATA (uc_kvm)* self)304 static void uc_handle_exit_ucontrol(FIXTURE_DATA(uc_kvm) *self)
305 {
306 struct kvm_run *run = self->run;
307 u64 seg_addr;
308 int rc;
309
310 TEST_ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason);
311 switch (run->s390_ucontrol.pgm_code) {
312 case PGM_SEGMENT_TRANSLATION:
313 seg_addr = run->s390_ucontrol.trans_exc_code & ~(SZ_1M - 1);
314 pr_info("ucontrol pic segment translation 0x%llx, mapping segment 0x%lx\n",
315 run->s390_ucontrol.trans_exc_code, seg_addr);
316 /* map / make additional memory available */
317 rc = uc_map_ext(self, seg_addr, SZ_1M);
318 TEST_ASSERT_EQ(0, rc);
319 break;
320 default:
321 TEST_FAIL("UNEXPECTED PGM CODE %d", run->s390_ucontrol.pgm_code);
322 }
323 }
324
325 /*
326 * Handle the SIEIC exit
327 * * fail on codes not expected in the test cases
328 * Returns if interception is handled / execution can be continued
329 */
uc_skey_enable(FIXTURE_DATA (uc_kvm)* self)330 static void uc_skey_enable(FIXTURE_DATA(uc_kvm) *self)
331 {
332 struct kvm_s390_sie_block *sie_block = self->sie_block;
333
334 /* disable KSS */
335 sie_block->cpuflags &= ~CPUSTAT_KSS;
336 /* disable skey inst interception */
337 sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
338 }
339
340 /*
341 * Handle the instruction intercept
342 * Returns if interception is handled / execution can be continued
343 */
uc_handle_insn_ic(FIXTURE_DATA (uc_kvm)* self)344 static bool uc_handle_insn_ic(FIXTURE_DATA(uc_kvm) *self)
345 {
346 struct kvm_s390_sie_block *sie_block = self->sie_block;
347 int ilen = insn_length(sie_block->ipa >> 8);
348 struct kvm_run *run = self->run;
349
350 switch (run->s390_sieic.ipa) {
351 case 0xB229: /* ISKE */
352 case 0xB22b: /* SSKE */
353 case 0xB22a: /* RRBE */
354 uc_skey_enable(self);
355
356 /* rewind to reexecute intercepted instruction */
357 run->psw_addr = run->psw_addr - ilen;
358 pr_info("rewind guest addr to 0x%.16llx\n", run->psw_addr);
359 return true;
360 default:
361 return false;
362 }
363 }
364
365 /*
366 * Handle the SIEIC exit
367 * * fail on codes not expected in the test cases
368 * Returns if interception is handled / execution can be continued
369 */
uc_handle_sieic(FIXTURE_DATA (uc_kvm)* self)370 static bool uc_handle_sieic(FIXTURE_DATA(uc_kvm) *self)
371 {
372 struct kvm_s390_sie_block *sie_block = self->sie_block;
373 struct kvm_run *run = self->run;
374
375 /* check SIE interception code */
376 pr_info("sieic: 0x%.2x 0x%.4x 0x%.8x\n",
377 run->s390_sieic.icptcode,
378 run->s390_sieic.ipa,
379 run->s390_sieic.ipb);
380 switch (run->s390_sieic.icptcode) {
381 case ICPT_INST:
382 /* end execution in caller on intercepted instruction */
383 pr_info("sie instruction interception\n");
384 return uc_handle_insn_ic(self);
385 case ICPT_KSS:
386 uc_skey_enable(self);
387 return true;
388 case ICPT_OPEREXC:
389 /* operation exception */
390 TEST_FAIL("sie exception on %.4x%.8x", sie_block->ipa, sie_block->ipb);
391 default:
392 TEST_FAIL("UNEXPECTED SIEIC CODE %d", run->s390_sieic.icptcode);
393 }
394 return true;
395 }
396
397 /* verify VM state on exit */
uc_handle_exit(FIXTURE_DATA (uc_kvm)* self)398 static bool uc_handle_exit(FIXTURE_DATA(uc_kvm) *self)
399 {
400 struct kvm_run *run = self->run;
401
402 switch (run->exit_reason) {
403 case KVM_EXIT_S390_UCONTROL:
404 /** check program interruption code
405 * handle page fault --> ucas map
406 */
407 uc_handle_exit_ucontrol(self);
408 break;
409 case KVM_EXIT_S390_SIEIC:
410 return uc_handle_sieic(self);
411 default:
412 pr_info("exit_reason %2d not handled\n", run->exit_reason);
413 }
414 return true;
415 }
416
417 /* run the VM until interrupted */
uc_run_once(FIXTURE_DATA (uc_kvm)* self)418 static int uc_run_once(FIXTURE_DATA(uc_kvm) *self)
419 {
420 int rc;
421
422 rc = ioctl(self->vcpu_fd, KVM_RUN, NULL);
423 print_run(self->run, self->sie_block);
424 print_regs(self->run);
425 pr_debug("run %d / %d %s\n", rc, errno, strerror(errno));
426 return rc;
427 }
428
uc_assert_diag44(FIXTURE_DATA (uc_kvm)* self)429 static void uc_assert_diag44(FIXTURE_DATA(uc_kvm) *self)
430 {
431 struct kvm_s390_sie_block *sie_block = self->sie_block;
432
433 /* assert vm was interrupted by diag 0x0044 */
434 TEST_ASSERT_EQ(KVM_EXIT_S390_SIEIC, self->run->exit_reason);
435 TEST_ASSERT_EQ(ICPT_INST, sie_block->icptcode);
436 TEST_ASSERT_EQ(0x8300, sie_block->ipa);
437 TEST_ASSERT_EQ(0x440000, sie_block->ipb);
438 }
439
TEST_F(uc_kvm,uc_no_user_region)440 TEST_F(uc_kvm, uc_no_user_region)
441 {
442 struct kvm_userspace_memory_region region = {
443 .slot = 1,
444 .guest_phys_addr = self->code_gpa,
445 .memory_size = VM_MEM_EXT_SIZE,
446 .userspace_addr = (uintptr_t)self->code_hva,
447 };
448 struct kvm_userspace_memory_region2 region2 = {
449 .slot = 1,
450 .guest_phys_addr = self->code_gpa,
451 .memory_size = VM_MEM_EXT_SIZE,
452 .userspace_addr = (uintptr_t)self->code_hva,
453 };
454
455 ASSERT_EQ(-1, ioctl(self->vm_fd, KVM_SET_USER_MEMORY_REGION, ®ion));
456 ASSERT_TRUE(errno == EEXIST || errno == EINVAL)
457 TH_LOG("errno %s (%i) not expected for ioctl KVM_SET_USER_MEMORY_REGION",
458 strerror(errno), errno);
459
460 ASSERT_EQ(-1, ioctl(self->vm_fd, KVM_SET_USER_MEMORY_REGION2, ®ion2));
461 ASSERT_TRUE(errno == EEXIST || errno == EINVAL)
462 TH_LOG("errno %s (%i) not expected for ioctl KVM_SET_USER_MEMORY_REGION2",
463 strerror(errno), errno);
464 }
465
TEST_F(uc_kvm,uc_map_unmap)466 TEST_F(uc_kvm, uc_map_unmap)
467 {
468 struct kvm_sync_regs *sync_regs = &self->run->s.regs;
469 struct kvm_run *run = self->run;
470 const u64 disp = 1;
471 int rc;
472
473 /* copy test_mem_asm to code_hva / code_gpa */
474 TH_LOG("copy code %p to vm mapped memory %p / %p",
475 &test_mem_asm, (void *)self->code_hva, (void *)self->code_gpa);
476 memcpy((void *)self->code_hva, &test_mem_asm, PAGE_SIZE);
477
478 /* DAT disabled + 64 bit mode */
479 run->psw_mask = 0x0000000180000000ULL;
480 run->psw_addr = self->code_gpa;
481
482 /* set register content for test_mem_asm to access not mapped memory*/
483 sync_regs->gprs[1] = 0x55;
484 sync_regs->gprs[5] = self->base_gpa;
485 sync_regs->gprs[6] = VM_MEM_SIZE + disp;
486 run->kvm_dirty_regs |= KVM_SYNC_GPRS;
487
488 /* run and expect to fail with ucontrol pic segment translation */
489 ASSERT_EQ(0, uc_run_once(self));
490 ASSERT_EQ(1, sync_regs->gprs[0]);
491 ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason);
492
493 ASSERT_EQ(PGM_SEGMENT_TRANSLATION, run->s390_ucontrol.pgm_code);
494 ASSERT_EQ(self->base_gpa + VM_MEM_SIZE, run->s390_ucontrol.trans_exc_code);
495
496 /* fail to map memory with not segment aligned address */
497 rc = uc_map_ext(self, self->base_gpa + VM_MEM_SIZE + disp, VM_MEM_EXT_SIZE);
498 ASSERT_GT(0, rc)
499 TH_LOG("ucas map for non segment address should fail but didn't; "
500 "result %d not expected, %s", rc, strerror(errno));
501
502 /* map / make additional memory available */
503 rc = uc_map_ext(self, self->base_gpa + VM_MEM_SIZE, VM_MEM_EXT_SIZE);
504 ASSERT_EQ(0, rc)
505 TH_LOG("ucas map result %d not expected, %s", rc, strerror(errno));
506 ASSERT_EQ(0, uc_run_once(self));
507 ASSERT_EQ(false, uc_handle_exit(self));
508 uc_assert_diag44(self);
509
510 /* assert registers and memory are in expected state */
511 ASSERT_EQ(2, sync_regs->gprs[0]);
512 ASSERT_EQ(0x55, sync_regs->gprs[1]);
513 ASSERT_EQ(0x55, *(u32 *)gpa2hva(self, self->base_gpa + VM_MEM_SIZE + disp));
514
515 /* unmap and run loop again */
516 rc = uc_unmap_ext(self, self->base_gpa + VM_MEM_SIZE, VM_MEM_EXT_SIZE);
517 ASSERT_EQ(0, rc)
518 TH_LOG("ucas unmap result %d not expected, %s", rc, strerror(errno));
519 ASSERT_EQ(0, uc_run_once(self));
520 ASSERT_EQ(3, sync_regs->gprs[0]);
521 ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason);
522 ASSERT_EQ(PGM_SEGMENT_TRANSLATION, run->s390_ucontrol.pgm_code);
523 /* handle ucontrol exit and remap memory after previous map and unmap */
524 ASSERT_EQ(true, uc_handle_exit(self));
525 }
526
TEST_F(uc_kvm,uc_gprs)527 TEST_F(uc_kvm, uc_gprs)
528 {
529 struct kvm_sync_regs *sync_regs = &self->run->s.regs;
530 struct kvm_run *run = self->run;
531 struct kvm_regs regs = {};
532
533 /* Set registers to values that are different from the ones that we expect below */
534 for (int i = 0; i < 8; i++)
535 sync_regs->gprs[i] = 8;
536 run->kvm_dirty_regs |= KVM_SYNC_GPRS;
537
538 /* copy test_gprs_asm to code_hva / code_gpa */
539 TH_LOG("copy code %p to vm mapped memory %p / %p",
540 &test_gprs_asm, (void *)self->code_hva, (void *)self->code_gpa);
541 memcpy((void *)self->code_hva, &test_gprs_asm, PAGE_SIZE);
542
543 /* DAT disabled + 64 bit mode */
544 run->psw_mask = 0x0000000180000000ULL;
545 run->psw_addr = self->code_gpa;
546
547 /* run and expect interception of diag 44 */
548 ASSERT_EQ(0, uc_run_once(self));
549 ASSERT_EQ(false, uc_handle_exit(self));
550 uc_assert_diag44(self);
551
552 /* Retrieve and check guest register values */
553 ASSERT_EQ(0, ioctl(self->vcpu_fd, KVM_GET_REGS, ®s));
554 for (int i = 0; i < 8; i++) {
555 ASSERT_EQ(i, regs.gprs[i]);
556 ASSERT_EQ(i, sync_regs->gprs[i]);
557 }
558
559 /* run and expect interception of diag 44 again */
560 ASSERT_EQ(0, uc_run_once(self));
561 ASSERT_EQ(false, uc_handle_exit(self));
562 uc_assert_diag44(self);
563
564 /* check continued increment of register 0 value */
565 ASSERT_EQ(0, ioctl(self->vcpu_fd, KVM_GET_REGS, ®s));
566 ASSERT_EQ(1, regs.gprs[0]);
567 ASSERT_EQ(1, sync_regs->gprs[0]);
568 }
569
TEST_F(uc_kvm,uc_skey)570 TEST_F(uc_kvm, uc_skey)
571 {
572 struct kvm_s390_sie_block *sie_block = self->sie_block;
573 struct kvm_sync_regs *sync_regs = &self->run->s.regs;
574 u64 test_vaddr = VM_MEM_SIZE - (SZ_1M / 2);
575 struct kvm_run *run = self->run;
576 const u8 skeyvalue = 0x34;
577
578 /* copy test_skey_asm to code_hva / code_gpa */
579 TH_LOG("copy code %p to vm mapped memory %p / %p",
580 &test_skey_asm, (void *)self->code_hva, (void *)self->code_gpa);
581 memcpy((void *)self->code_hva, &test_skey_asm, PAGE_SIZE);
582
583 /* set register content for test_skey_asm to access not mapped memory */
584 sync_regs->gprs[1] = skeyvalue;
585 sync_regs->gprs[5] = self->base_gpa;
586 sync_regs->gprs[6] = test_vaddr;
587 run->kvm_dirty_regs |= KVM_SYNC_GPRS;
588
589 /* DAT disabled + 64 bit mode */
590 run->psw_mask = 0x0000000180000000ULL;
591 run->psw_addr = self->code_gpa;
592
593 ASSERT_EQ(0, uc_run_once(self));
594 ASSERT_EQ(true, uc_handle_exit(self));
595 ASSERT_EQ(1, sync_regs->gprs[0]);
596
597 /* SSKE + ISKE */
598 sync_regs->gprs[1] = skeyvalue;
599 run->kvm_dirty_regs |= KVM_SYNC_GPRS;
600 ASSERT_EQ(0, uc_run_once(self));
601
602 /*
603 * Bail out and skip the test after uc_skey_enable was executed but iske
604 * is still intercepted. Instructions are not handled by the kernel.
605 * Thus there is no need to test this here.
606 */
607 TEST_ASSERT_EQ(0, sie_block->cpuflags & CPUSTAT_KSS);
608 TEST_ASSERT_EQ(0, sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE));
609 TEST_ASSERT_EQ(KVM_EXIT_S390_SIEIC, self->run->exit_reason);
610 TEST_ASSERT_EQ(ICPT_INST, sie_block->icptcode);
611 TEST_REQUIRE(sie_block->ipa != 0xb22b);
612
613 /* SSKE + ISKE contd. */
614 ASSERT_EQ(false, uc_handle_exit(self));
615 ASSERT_EQ(2, sync_regs->gprs[0]);
616 ASSERT_EQ(skeyvalue, sync_regs->gprs[1]);
617 uc_assert_diag44(self);
618
619 /* RRBE + ISKE */
620 sync_regs->gprs[1] = skeyvalue;
621 run->kvm_dirty_regs |= KVM_SYNC_GPRS;
622 ASSERT_EQ(0, uc_run_once(self));
623 ASSERT_EQ(false, uc_handle_exit(self));
624 ASSERT_EQ(3, sync_regs->gprs[0]);
625 /* assert R reset but rest of skey unchanged */
626 ASSERT_EQ(skeyvalue & 0xfa, sync_regs->gprs[1]);
627 ASSERT_EQ(0, sync_regs->gprs[1] & 0x04);
628 uc_assert_diag44(self);
629 }
630
631 static char uc_flic_b[PAGE_SIZE];
632 static struct kvm_s390_io_adapter uc_flic_ioa = { .id = 0 };
633 static struct kvm_s390_io_adapter_req uc_flic_ioam = { .id = 0 };
634 static struct kvm_s390_ais_req uc_flic_asim = { .isc = 0 };
635 static struct kvm_s390_ais_all uc_flic_asima = { .simm = 0 };
636 static struct uc_flic_attr_test {
637 char *name;
638 struct kvm_device_attr a;
639 int hasrc;
640 int geterrno;
641 int seterrno;
642 } uc_flic_attr_tests[] = {
643 {
644 .name = "KVM_DEV_FLIC_GET_ALL_IRQS",
645 .seterrno = EINVAL,
646 .a = {
647 .group = KVM_DEV_FLIC_GET_ALL_IRQS,
648 .addr = (u64)&uc_flic_b,
649 .attr = PAGE_SIZE,
650 },
651 },
652 {
653 .name = "KVM_DEV_FLIC_ENQUEUE",
654 .geterrno = EINVAL,
655 .a = { .group = KVM_DEV_FLIC_ENQUEUE, },
656 },
657 {
658 .name = "KVM_DEV_FLIC_CLEAR_IRQS",
659 .geterrno = EINVAL,
660 .a = { .group = KVM_DEV_FLIC_CLEAR_IRQS, },
661 },
662 {
663 .name = "KVM_DEV_FLIC_ADAPTER_REGISTER",
664 .geterrno = EINVAL,
665 .a = {
666 .group = KVM_DEV_FLIC_ADAPTER_REGISTER,
667 .addr = (u64)&uc_flic_ioa,
668 },
669 },
670 {
671 .name = "KVM_DEV_FLIC_ADAPTER_MODIFY",
672 .geterrno = EINVAL,
673 .seterrno = EINVAL,
674 .a = {
675 .group = KVM_DEV_FLIC_ADAPTER_MODIFY,
676 .addr = (u64)&uc_flic_ioam,
677 .attr = sizeof(uc_flic_ioam),
678 },
679 },
680 {
681 .name = "KVM_DEV_FLIC_CLEAR_IO_IRQ",
682 .geterrno = EINVAL,
683 .seterrno = EINVAL,
684 .a = {
685 .group = KVM_DEV_FLIC_CLEAR_IO_IRQ,
686 .attr = 32,
687 },
688 },
689 {
690 .name = "KVM_DEV_FLIC_AISM",
691 .geterrno = EINVAL,
692 .seterrno = ENOTSUP,
693 .a = {
694 .group = KVM_DEV_FLIC_AISM,
695 .addr = (u64)&uc_flic_asim,
696 },
697 },
698 {
699 .name = "KVM_DEV_FLIC_AIRQ_INJECT",
700 .geterrno = EINVAL,
701 .a = { .group = KVM_DEV_FLIC_AIRQ_INJECT, },
702 },
703 {
704 .name = "KVM_DEV_FLIC_AISM_ALL",
705 .geterrno = ENOTSUP,
706 .seterrno = ENOTSUP,
707 .a = {
708 .group = KVM_DEV_FLIC_AISM_ALL,
709 .addr = (u64)&uc_flic_asima,
710 .attr = sizeof(uc_flic_asima),
711 },
712 },
713 {
714 .name = "KVM_DEV_FLIC_APF_ENABLE",
715 .geterrno = EINVAL,
716 .seterrno = EINVAL,
717 .a = { .group = KVM_DEV_FLIC_APF_ENABLE, },
718 },
719 {
720 .name = "KVM_DEV_FLIC_APF_DISABLE_WAIT",
721 .geterrno = EINVAL,
722 .seterrno = EINVAL,
723 .a = { .group = KVM_DEV_FLIC_APF_DISABLE_WAIT, },
724 },
725 };
726
TEST_F(uc_kvm,uc_flic_attrs)727 TEST_F(uc_kvm, uc_flic_attrs)
728 {
729 struct kvm_create_device cd = { .type = KVM_DEV_TYPE_FLIC };
730 struct kvm_device_attr attr;
731 u64 value;
732 int rc, i;
733
734 rc = ioctl(self->vm_fd, KVM_CREATE_DEVICE, &cd);
735 ASSERT_EQ(0, rc) TH_LOG("create device failed with err %s (%i)",
736 strerror(errno), errno);
737
738 for (i = 0; i < ARRAY_SIZE(uc_flic_attr_tests); i++) {
739 TH_LOG("test %s", uc_flic_attr_tests[i].name);
740 attr = (struct kvm_device_attr) {
741 .group = uc_flic_attr_tests[i].a.group,
742 .attr = uc_flic_attr_tests[i].a.attr,
743 .addr = uc_flic_attr_tests[i].a.addr,
744 };
745 if (attr.addr == 0)
746 attr.addr = (u64)&value;
747
748 rc = ioctl(cd.fd, KVM_HAS_DEVICE_ATTR, &attr);
749 EXPECT_EQ(uc_flic_attr_tests[i].hasrc, !!rc)
750 TH_LOG("expected dev attr missing %s",
751 uc_flic_attr_tests[i].name);
752
753 rc = ioctl(cd.fd, KVM_GET_DEVICE_ATTR, &attr);
754 EXPECT_EQ(!!uc_flic_attr_tests[i].geterrno, !!rc)
755 TH_LOG("get dev attr rc not expected on %s %s (%i)",
756 uc_flic_attr_tests[i].name,
757 strerror(errno), errno);
758 if (uc_flic_attr_tests[i].geterrno)
759 EXPECT_EQ(uc_flic_attr_tests[i].geterrno, errno)
760 TH_LOG("get dev attr errno not expected on %s %s (%i)",
761 uc_flic_attr_tests[i].name,
762 strerror(errno), errno);
763
764 rc = ioctl(cd.fd, KVM_SET_DEVICE_ATTR, &attr);
765 EXPECT_EQ(!!uc_flic_attr_tests[i].seterrno, !!rc)
766 TH_LOG("set sev attr rc not expected on %s %s (%i)",
767 uc_flic_attr_tests[i].name,
768 strerror(errno), errno);
769 if (uc_flic_attr_tests[i].seterrno)
770 EXPECT_EQ(uc_flic_attr_tests[i].seterrno, errno)
771 TH_LOG("set dev attr errno not expected on %s %s (%i)",
772 uc_flic_attr_tests[i].name,
773 strerror(errno), errno);
774 }
775
776 close(cd.fd);
777 }
778
TEST_F(uc_kvm,uc_set_gsi_routing)779 TEST_F(uc_kvm, uc_set_gsi_routing)
780 {
781 struct kvm_irq_routing *routing = kvm_gsi_routing_create();
782 struct kvm_irq_routing_entry ue = {
783 .type = KVM_IRQ_ROUTING_S390_ADAPTER,
784 .gsi = 1,
785 .u.adapter = (struct kvm_irq_routing_s390_adapter) {
786 .ind_addr = 0,
787 },
788 };
789 int rc;
790
791 routing->entries[0] = ue;
792 routing->nr = 1;
793 rc = ioctl(self->vm_fd, KVM_SET_GSI_ROUTING, routing);
794 ASSERT_EQ(-1, rc) TH_LOG("err %s (%i)", strerror(errno), errno);
795 ASSERT_EQ(EINVAL, errno) TH_LOG("err %s (%i)", strerror(errno), errno);
796 }
797
798 TEST_HARNESS_MAIN
799