1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling privileged instructions
4 *
5 * Copyright IBM Corp. 2008, 2020
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 */
10
11 #include <linux/kvm.h>
12 #include <linux/gfp.h>
13 #include <linux/errno.h>
14 #include <linux/mm_types.h>
15 #include <linux/pgtable.h>
16
17 #include <asm/asm-offsets.h>
18 #include <asm/facility.h>
19 #include <asm/current.h>
20 #include <asm/debug.h>
21 #include <asm/ebcdic.h>
22 #include <asm/sysinfo.h>
23 #include <asm/page-states.h>
24 #include <asm/gmap.h>
25 #include <asm/io.h>
26 #include <asm/ptrace.h>
27 #include <asm/sclp.h>
28 #include <asm/ap.h>
29 #include "gaccess.h"
30 #include "kvm-s390.h"
31 #include "trace.h"
32
handle_ri(struct kvm_vcpu * vcpu)33 static int handle_ri(struct kvm_vcpu *vcpu)
34 {
35 vcpu->stat.instruction_ri++;
36
37 if (test_kvm_facility(vcpu->kvm, 64)) {
38 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
39 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
40 kvm_s390_retry_instr(vcpu);
41 return 0;
42 } else
43 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
44 }
45
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)46 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
47 {
48 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
49 return handle_ri(vcpu);
50 else
51 return -EOPNOTSUPP;
52 }
53
handle_gs(struct kvm_vcpu * vcpu)54 static int handle_gs(struct kvm_vcpu *vcpu)
55 {
56 vcpu->stat.instruction_gs++;
57
58 if (test_kvm_facility(vcpu->kvm, 133)) {
59 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
60 preempt_disable();
61 __ctl_set_bit(2, 4);
62 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
63 restore_gs_cb(current->thread.gs_cb);
64 preempt_enable();
65 vcpu->arch.sie_block->ecb |= ECB_GS;
66 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
67 vcpu->arch.gs_enabled = 1;
68 kvm_s390_retry_instr(vcpu);
69 return 0;
70 } else
71 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
72 }
73
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)74 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
75 {
76 int code = vcpu->arch.sie_block->ipb & 0xff;
77
78 if (code == 0x49 || code == 0x4d)
79 return handle_gs(vcpu);
80 else
81 return -EOPNOTSUPP;
82 }
83 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)84 static int handle_set_clock(struct kvm_vcpu *vcpu)
85 {
86 struct kvm_s390_vm_tod_clock gtod = { 0 };
87 int rc;
88 u8 ar;
89 u64 op2;
90
91 vcpu->stat.instruction_sck++;
92
93 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
94 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
95
96 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
97 if (op2 & 7) /* Operand must be on a doubleword boundary */
98 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
99 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
100 if (rc)
101 return kvm_s390_inject_prog_cond(vcpu, rc);
102
103 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
104 /*
105 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
106 * is already held in handle_set_clock. The usual lock order is the
107 * opposite. As SCK is deprecated and should not be used in several
108 * cases, for example when the multiple epoch facility or TOD clock
109 * steering facility is installed (see Principles of Operation), a
110 * slow path can be used. If the lock can not be taken via try_lock,
111 * the instruction will be retried via -EAGAIN at a later point in
112 * time.
113 */
114 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
115 kvm_s390_retry_instr(vcpu);
116 return -EAGAIN;
117 }
118
119 kvm_s390_set_psw_cc(vcpu, 0);
120 return 0;
121 }
122
handle_set_prefix(struct kvm_vcpu * vcpu)123 static int handle_set_prefix(struct kvm_vcpu *vcpu)
124 {
125 u64 operand2;
126 u32 address;
127 int rc;
128 u8 ar;
129
130 vcpu->stat.instruction_spx++;
131
132 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
133 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
134
135 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
136
137 /* must be word boundary */
138 if (operand2 & 3)
139 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
140
141 /* get the value */
142 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
143 if (rc)
144 return kvm_s390_inject_prog_cond(vcpu, rc);
145
146 address &= 0x7fffe000u;
147
148 /*
149 * Make sure the new value is valid memory. We only need to check the
150 * first page, since address is 8k aligned and memory pieces are always
151 * at least 1MB aligned and have at least a size of 1MB.
152 */
153 if (kvm_is_error_gpa(vcpu->kvm, address))
154 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
155
156 kvm_s390_set_prefix(vcpu, address);
157 trace_kvm_s390_handle_prefix(vcpu, 1, address);
158 return 0;
159 }
160
handle_store_prefix(struct kvm_vcpu * vcpu)161 static int handle_store_prefix(struct kvm_vcpu *vcpu)
162 {
163 u64 operand2;
164 u32 address;
165 int rc;
166 u8 ar;
167
168 vcpu->stat.instruction_stpx++;
169
170 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
171 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
172
173 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
174
175 /* must be word boundary */
176 if (operand2 & 3)
177 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
178
179 address = kvm_s390_get_prefix(vcpu);
180
181 /* get the value */
182 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
183 if (rc)
184 return kvm_s390_inject_prog_cond(vcpu, rc);
185
186 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
187 trace_kvm_s390_handle_prefix(vcpu, 0, address);
188 return 0;
189 }
190
handle_store_cpu_address(struct kvm_vcpu * vcpu)191 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
192 {
193 u16 vcpu_id = vcpu->vcpu_id;
194 u64 ga;
195 int rc;
196 u8 ar;
197
198 vcpu->stat.instruction_stap++;
199
200 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
201 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
202
203 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
204
205 if (ga & 1)
206 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
207
208 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
209 if (rc)
210 return kvm_s390_inject_prog_cond(vcpu, rc);
211
212 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
213 trace_kvm_s390_handle_stap(vcpu, ga);
214 return 0;
215 }
216
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)217 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
218 {
219 int rc;
220
221 trace_kvm_s390_skey_related_inst(vcpu);
222 /* Already enabled? */
223 if (vcpu->arch.skey_enabled)
224 return 0;
225
226 rc = s390_enable_skey();
227 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
228 if (rc)
229 return rc;
230
231 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
232 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
233 if (!vcpu->kvm->arch.use_skf)
234 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
235 else
236 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
237 vcpu->arch.skey_enabled = true;
238 return 0;
239 }
240
try_handle_skey(struct kvm_vcpu * vcpu)241 static int try_handle_skey(struct kvm_vcpu *vcpu)
242 {
243 int rc;
244
245 rc = kvm_s390_skey_check_enable(vcpu);
246 if (rc)
247 return rc;
248 if (vcpu->kvm->arch.use_skf) {
249 /* with storage-key facility, SIE interprets it for us */
250 kvm_s390_retry_instr(vcpu);
251 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
252 return -EAGAIN;
253 }
254 return 0;
255 }
256
handle_iske(struct kvm_vcpu * vcpu)257 static int handle_iske(struct kvm_vcpu *vcpu)
258 {
259 unsigned long gaddr, vmaddr;
260 unsigned char key;
261 int reg1, reg2;
262 bool unlocked;
263 int rc;
264
265 vcpu->stat.instruction_iske++;
266
267 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
268 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
269
270 rc = try_handle_skey(vcpu);
271 if (rc)
272 return rc != -EAGAIN ? rc : 0;
273
274 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
275
276 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
277 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
278 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
279 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
280 if (kvm_is_error_hva(vmaddr))
281 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
282 retry:
283 unlocked = false;
284 mmap_read_lock(current->mm);
285 rc = get_guest_storage_key(current->mm, vmaddr, &key);
286
287 if (rc) {
288 rc = fixup_user_fault(current->mm, vmaddr,
289 FAULT_FLAG_WRITE, &unlocked);
290 if (!rc) {
291 mmap_read_unlock(current->mm);
292 goto retry;
293 }
294 }
295 mmap_read_unlock(current->mm);
296 if (rc == -EFAULT)
297 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
298 if (rc < 0)
299 return rc;
300 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
301 vcpu->run->s.regs.gprs[reg1] |= key;
302 return 0;
303 }
304
handle_rrbe(struct kvm_vcpu * vcpu)305 static int handle_rrbe(struct kvm_vcpu *vcpu)
306 {
307 unsigned long vmaddr, gaddr;
308 int reg1, reg2;
309 bool unlocked;
310 int rc;
311
312 vcpu->stat.instruction_rrbe++;
313
314 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
315 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
316
317 rc = try_handle_skey(vcpu);
318 if (rc)
319 return rc != -EAGAIN ? rc : 0;
320
321 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
322
323 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
324 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
325 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
326 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
327 if (kvm_is_error_hva(vmaddr))
328 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
329 retry:
330 unlocked = false;
331 mmap_read_lock(current->mm);
332 rc = reset_guest_reference_bit(current->mm, vmaddr);
333 if (rc < 0) {
334 rc = fixup_user_fault(current->mm, vmaddr,
335 FAULT_FLAG_WRITE, &unlocked);
336 if (!rc) {
337 mmap_read_unlock(current->mm);
338 goto retry;
339 }
340 }
341 mmap_read_unlock(current->mm);
342 if (rc == -EFAULT)
343 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
344 if (rc < 0)
345 return rc;
346 kvm_s390_set_psw_cc(vcpu, rc);
347 return 0;
348 }
349
350 #define SSKE_NQ 0x8
351 #define SSKE_MR 0x4
352 #define SSKE_MC 0x2
353 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)354 static int handle_sske(struct kvm_vcpu *vcpu)
355 {
356 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
357 unsigned long start, end;
358 unsigned char key, oldkey;
359 int reg1, reg2;
360 bool unlocked;
361 int rc;
362
363 vcpu->stat.instruction_sske++;
364
365 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
366 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
367
368 rc = try_handle_skey(vcpu);
369 if (rc)
370 return rc != -EAGAIN ? rc : 0;
371
372 if (!test_kvm_facility(vcpu->kvm, 8))
373 m3 &= ~SSKE_MB;
374 if (!test_kvm_facility(vcpu->kvm, 10))
375 m3 &= ~(SSKE_MC | SSKE_MR);
376 if (!test_kvm_facility(vcpu->kvm, 14))
377 m3 &= ~SSKE_NQ;
378
379 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
380
381 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
382 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
383 start = kvm_s390_logical_to_effective(vcpu, start);
384 if (m3 & SSKE_MB) {
385 /* start already designates an absolute address */
386 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
387 } else {
388 start = kvm_s390_real_to_abs(vcpu, start);
389 end = start + PAGE_SIZE;
390 }
391
392 while (start != end) {
393 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
394 unlocked = false;
395
396 if (kvm_is_error_hva(vmaddr))
397 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
398
399 mmap_read_lock(current->mm);
400 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
401 m3 & SSKE_NQ, m3 & SSKE_MR,
402 m3 & SSKE_MC);
403
404 if (rc < 0) {
405 rc = fixup_user_fault(current->mm, vmaddr,
406 FAULT_FLAG_WRITE, &unlocked);
407 rc = !rc ? -EAGAIN : rc;
408 }
409 mmap_read_unlock(current->mm);
410 if (rc == -EFAULT)
411 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
412 if (rc == -EAGAIN)
413 continue;
414 if (rc < 0)
415 return rc;
416 start += PAGE_SIZE;
417 }
418
419 if (m3 & (SSKE_MC | SSKE_MR)) {
420 if (m3 & SSKE_MB) {
421 /* skey in reg1 is unpredictable */
422 kvm_s390_set_psw_cc(vcpu, 3);
423 } else {
424 kvm_s390_set_psw_cc(vcpu, rc);
425 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
426 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
427 }
428 }
429 if (m3 & SSKE_MB) {
430 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
431 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
432 else
433 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
434 end = kvm_s390_logical_to_effective(vcpu, end);
435 vcpu->run->s.regs.gprs[reg2] |= end;
436 }
437 return 0;
438 }
439
handle_ipte_interlock(struct kvm_vcpu * vcpu)440 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
441 {
442 vcpu->stat.instruction_ipte_interlock++;
443 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
444 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
445 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
446 kvm_s390_retry_instr(vcpu);
447 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
448 return 0;
449 }
450
handle_test_block(struct kvm_vcpu * vcpu)451 static int handle_test_block(struct kvm_vcpu *vcpu)
452 {
453 gpa_t addr;
454 int reg2;
455
456 vcpu->stat.instruction_tb++;
457
458 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
459 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
460
461 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
462 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
463 addr = kvm_s390_logical_to_effective(vcpu, addr);
464 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
465 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
466 addr = kvm_s390_real_to_abs(vcpu, addr);
467
468 if (kvm_is_error_gpa(vcpu->kvm, addr))
469 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
470 /*
471 * We don't expect errors on modern systems, and do not care
472 * about storage keys (yet), so let's just clear the page.
473 */
474 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
475 return -EFAULT;
476 kvm_s390_set_psw_cc(vcpu, 0);
477 vcpu->run->s.regs.gprs[0] = 0;
478 return 0;
479 }
480
handle_tpi(struct kvm_vcpu * vcpu)481 static int handle_tpi(struct kvm_vcpu *vcpu)
482 {
483 struct kvm_s390_interrupt_info *inti;
484 unsigned long len;
485 u32 tpi_data[3];
486 int rc;
487 u64 addr;
488 u8 ar;
489
490 vcpu->stat.instruction_tpi++;
491
492 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
493 if (addr & 3)
494 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
495
496 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
497 if (!inti) {
498 kvm_s390_set_psw_cc(vcpu, 0);
499 return 0;
500 }
501
502 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
503 tpi_data[1] = inti->io.io_int_parm;
504 tpi_data[2] = inti->io.io_int_word;
505 if (addr) {
506 /*
507 * Store the two-word I/O interruption code into the
508 * provided area.
509 */
510 len = sizeof(tpi_data) - 4;
511 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
512 if (rc) {
513 rc = kvm_s390_inject_prog_cond(vcpu, rc);
514 goto reinject_interrupt;
515 }
516 } else {
517 /*
518 * Store the three-word I/O interruption code into
519 * the appropriate lowcore area.
520 */
521 len = sizeof(tpi_data);
522 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
523 /* failed writes to the low core are not recoverable */
524 rc = -EFAULT;
525 goto reinject_interrupt;
526 }
527 }
528
529 /* irq was successfully handed to the guest */
530 kfree(inti);
531 kvm_s390_set_psw_cc(vcpu, 1);
532 return 0;
533 reinject_interrupt:
534 /*
535 * If we encounter a problem storing the interruption code, the
536 * instruction is suppressed from the guest's view: reinject the
537 * interrupt.
538 */
539 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
540 kfree(inti);
541 rc = -EFAULT;
542 }
543 /* don't set the cc, a pgm irq was injected or we drop to user space */
544 return rc ? -EFAULT : 0;
545 }
546
handle_tsch(struct kvm_vcpu * vcpu)547 static int handle_tsch(struct kvm_vcpu *vcpu)
548 {
549 struct kvm_s390_interrupt_info *inti = NULL;
550 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
551
552 vcpu->stat.instruction_tsch++;
553
554 /* a valid schid has at least one bit set */
555 if (vcpu->run->s.regs.gprs[1])
556 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
557 vcpu->run->s.regs.gprs[1]);
558
559 /*
560 * Prepare exit to userspace.
561 * We indicate whether we dequeued a pending I/O interrupt
562 * so that userspace can re-inject it if the instruction gets
563 * a program check. While this may re-order the pending I/O
564 * interrupts, this is no problem since the priority is kept
565 * intact.
566 */
567 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
568 vcpu->run->s390_tsch.dequeued = !!inti;
569 if (inti) {
570 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
571 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
572 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
573 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
574 }
575 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
576 kfree(inti);
577 return -EREMOTE;
578 }
579
handle_io_inst(struct kvm_vcpu * vcpu)580 static int handle_io_inst(struct kvm_vcpu *vcpu)
581 {
582 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
583
584 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
585 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
586
587 if (vcpu->kvm->arch.css_support) {
588 /*
589 * Most I/O instructions will be handled by userspace.
590 * Exceptions are tpi and the interrupt portion of tsch.
591 */
592 if (vcpu->arch.sie_block->ipa == 0xb236)
593 return handle_tpi(vcpu);
594 if (vcpu->arch.sie_block->ipa == 0xb235)
595 return handle_tsch(vcpu);
596 /* Handle in userspace. */
597 vcpu->stat.instruction_io_other++;
598 return -EOPNOTSUPP;
599 } else {
600 /*
601 * Set condition code 3 to stop the guest from issuing channel
602 * I/O instructions.
603 */
604 kvm_s390_set_psw_cc(vcpu, 3);
605 return 0;
606 }
607 }
608
609 /*
610 * handle_pqap: Handling pqap interception
611 * @vcpu: the vcpu having issue the pqap instruction
612 *
613 * We now support PQAP/AQIC instructions and we need to correctly
614 * answer the guest even if no dedicated driver's hook is available.
615 *
616 * The intercepting code calls a dedicated callback for this instruction
617 * if a driver did register one in the CRYPTO satellite of the
618 * SIE block.
619 *
620 * If no callback is available, the queues are not available, return this
621 * response code to the caller and set CC to 3.
622 * Else return the response code returned by the callback.
623 */
handle_pqap(struct kvm_vcpu * vcpu)624 static int handle_pqap(struct kvm_vcpu *vcpu)
625 {
626 struct ap_queue_status status = {};
627 crypto_hook pqap_hook;
628 unsigned long reg0;
629 int ret;
630 uint8_t fc;
631
632 /* Verify that the AP instruction are available */
633 if (!ap_instructions_available())
634 return -EOPNOTSUPP;
635 /* Verify that the guest is allowed to use AP instructions */
636 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
637 return -EOPNOTSUPP;
638 /*
639 * The only possibly intercepted functions when AP instructions are
640 * available for the guest are AQIC and TAPQ with the t bit set
641 * since we do not set IC.3 (FIII) we currently will only intercept
642 * the AQIC function code.
643 * Note: running nested under z/VM can result in intercepts for other
644 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
645 */
646 reg0 = vcpu->run->s.regs.gprs[0];
647 fc = (reg0 >> 24) & 0xff;
648 if (fc != 0x03)
649 return -EOPNOTSUPP;
650
651 /* PQAP instruction is allowed for guest kernel only */
652 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
653 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
654
655 /* Common PQAP instruction specification exceptions */
656 /* bits 41-47 must all be zeros */
657 if (reg0 & 0x007f0000UL)
658 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
659 /* APFT not install and T bit set */
660 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
661 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
662 /* APXA not installed and APID greater 64 or APQI greater 16 */
663 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
664 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
665
666 /* AQIC function code specific exception */
667 /* facility 65 not present for AQIC function code */
668 if (!test_kvm_facility(vcpu->kvm, 65))
669 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
670
671 /*
672 * If the hook callback is registered, there will be a pointer to the
673 * hook function pointer in the kvm_s390_crypto structure. Lock the
674 * owner, retrieve the hook function pointer and call the hook.
675 */
676 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
677 if (vcpu->kvm->arch.crypto.pqap_hook) {
678 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
679 ret = pqap_hook(vcpu);
680 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
681 kvm_s390_set_psw_cc(vcpu, 3);
682 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
683 return ret;
684 }
685 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
686 /*
687 * A vfio_driver must register a hook.
688 * No hook means no driver to enable the SIE CRYCB and no queues.
689 * We send this response to the guest.
690 */
691 status.response_code = 0x01;
692 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
693 kvm_s390_set_psw_cc(vcpu, 3);
694 return 0;
695 }
696
handle_stfl(struct kvm_vcpu * vcpu)697 static int handle_stfl(struct kvm_vcpu *vcpu)
698 {
699 int rc;
700 unsigned int fac;
701
702 vcpu->stat.instruction_stfl++;
703
704 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
705 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
706
707 /*
708 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
709 * into a u32 memory representation. They will remain bits 0-31.
710 */
711 fac = *vcpu->kvm->arch.model.fac_list >> 32;
712 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
713 &fac, sizeof(fac));
714 if (rc)
715 return rc;
716 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
717 trace_kvm_s390_handle_stfl(vcpu, fac);
718 return 0;
719 }
720
721 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
722 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
723 #define PSW_ADDR_24 0x0000000000ffffffUL
724 #define PSW_ADDR_31 0x000000007fffffffUL
725
is_valid_psw(psw_t * psw)726 int is_valid_psw(psw_t *psw)
727 {
728 if (psw->mask & PSW_MASK_UNASSIGNED)
729 return 0;
730 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
731 if (psw->addr & ~PSW_ADDR_31)
732 return 0;
733 }
734 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
735 return 0;
736 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
737 return 0;
738 if (psw->addr & 1)
739 return 0;
740 return 1;
741 }
742
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)743 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
744 {
745 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
746 psw_compat_t new_psw;
747 u64 addr;
748 int rc;
749 u8 ar;
750
751 vcpu->stat.instruction_lpsw++;
752
753 if (gpsw->mask & PSW_MASK_PSTATE)
754 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
755
756 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
757 if (addr & 7)
758 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
759
760 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
761 if (rc)
762 return kvm_s390_inject_prog_cond(vcpu, rc);
763 if (!(new_psw.mask & PSW32_MASK_BASE))
764 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
765 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
766 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
767 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
768 if (!is_valid_psw(gpsw))
769 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
770 return 0;
771 }
772
handle_lpswe(struct kvm_vcpu * vcpu)773 static int handle_lpswe(struct kvm_vcpu *vcpu)
774 {
775 psw_t new_psw;
776 u64 addr;
777 int rc;
778 u8 ar;
779
780 vcpu->stat.instruction_lpswe++;
781
782 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
783 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
784
785 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
786 if (addr & 7)
787 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
788 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
789 if (rc)
790 return kvm_s390_inject_prog_cond(vcpu, rc);
791 vcpu->arch.sie_block->gpsw = new_psw;
792 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
793 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
794 return 0;
795 }
796
handle_stidp(struct kvm_vcpu * vcpu)797 static int handle_stidp(struct kvm_vcpu *vcpu)
798 {
799 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
800 u64 operand2;
801 int rc;
802 u8 ar;
803
804 vcpu->stat.instruction_stidp++;
805
806 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
807 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
808
809 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
810
811 if (operand2 & 7)
812 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
813
814 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
815 if (rc)
816 return kvm_s390_inject_prog_cond(vcpu, rc);
817
818 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
819 return 0;
820 }
821
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)822 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
823 {
824 int cpus = 0;
825 int n;
826
827 cpus = atomic_read(&vcpu->kvm->online_vcpus);
828
829 /* deal with other level 3 hypervisors */
830 if (stsi(mem, 3, 2, 2))
831 mem->count = 0;
832 if (mem->count < 8)
833 mem->count++;
834 for (n = mem->count - 1; n > 0 ; n--)
835 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
836
837 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
838 mem->vm[0].cpus_total = cpus;
839 mem->vm[0].cpus_configured = cpus;
840 mem->vm[0].cpus_standby = 0;
841 mem->vm[0].cpus_reserved = 0;
842 mem->vm[0].caf = 1000;
843 memcpy(mem->vm[0].name, "KVMguest", 8);
844 ASCEBC(mem->vm[0].name, 8);
845 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
846 ASCEBC(mem->vm[0].cpi, 16);
847 }
848
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)849 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
850 u8 fc, u8 sel1, u16 sel2)
851 {
852 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
853 vcpu->run->s390_stsi.addr = addr;
854 vcpu->run->s390_stsi.ar = ar;
855 vcpu->run->s390_stsi.fc = fc;
856 vcpu->run->s390_stsi.sel1 = sel1;
857 vcpu->run->s390_stsi.sel2 = sel2;
858 }
859
handle_stsi(struct kvm_vcpu * vcpu)860 static int handle_stsi(struct kvm_vcpu *vcpu)
861 {
862 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
863 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
864 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
865 unsigned long mem = 0;
866 u64 operand2;
867 int rc = 0;
868 u8 ar;
869
870 vcpu->stat.instruction_stsi++;
871 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
872
873 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
874 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
875
876 /* Bailout forbidden function codes */
877 if (fc > 3 && fc != 15)
878 goto out_no_data;
879
880 /*
881 * fc 15 is provided only with
882 * - PTF/CPU topology support through facility 15
883 * - KVM_CAP_S390_USER_STSI
884 */
885 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
886 !vcpu->kvm->arch.user_stsi))
887 goto out_no_data;
888
889 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
890 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
891 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
892
893 if (fc == 0) {
894 vcpu->run->s.regs.gprs[0] = 3 << 28;
895 kvm_s390_set_psw_cc(vcpu, 0);
896 return 0;
897 }
898
899 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
900
901 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
902 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
903
904 switch (fc) {
905 case 1: /* same handling for 1 and 2 */
906 case 2:
907 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
908 if (!mem)
909 goto out_no_data;
910 if (stsi((void *) mem, fc, sel1, sel2))
911 goto out_no_data;
912 break;
913 case 3:
914 if (sel1 != 2 || sel2 != 2)
915 goto out_no_data;
916 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
917 if (!mem)
918 goto out_no_data;
919 handle_stsi_3_2_2(vcpu, (void *) mem);
920 break;
921 case 15: /* fc 15 is fully handled in userspace */
922 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
923 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
924 return -EREMOTE;
925 }
926 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
927 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
928 PAGE_SIZE);
929 rc = 0;
930 } else {
931 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
932 }
933 if (rc) {
934 rc = kvm_s390_inject_prog_cond(vcpu, rc);
935 goto out;
936 }
937 if (vcpu->kvm->arch.user_stsi) {
938 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
939 rc = -EREMOTE;
940 }
941 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
942 free_page(mem);
943 kvm_s390_set_psw_cc(vcpu, 0);
944 vcpu->run->s.regs.gprs[0] = 0;
945 return rc;
946 out_no_data:
947 kvm_s390_set_psw_cc(vcpu, 3);
948 out:
949 free_page(mem);
950 return rc;
951 }
952
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)953 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
954 {
955 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
956 case 0x02:
957 return handle_stidp(vcpu);
958 case 0x04:
959 return handle_set_clock(vcpu);
960 case 0x10:
961 return handle_set_prefix(vcpu);
962 case 0x11:
963 return handle_store_prefix(vcpu);
964 case 0x12:
965 return handle_store_cpu_address(vcpu);
966 case 0x14:
967 return kvm_s390_handle_vsie(vcpu);
968 case 0x21:
969 case 0x50:
970 return handle_ipte_interlock(vcpu);
971 case 0x29:
972 return handle_iske(vcpu);
973 case 0x2a:
974 return handle_rrbe(vcpu);
975 case 0x2b:
976 return handle_sske(vcpu);
977 case 0x2c:
978 return handle_test_block(vcpu);
979 case 0x30:
980 case 0x31:
981 case 0x32:
982 case 0x33:
983 case 0x34:
984 case 0x35:
985 case 0x36:
986 case 0x37:
987 case 0x38:
988 case 0x39:
989 case 0x3a:
990 case 0x3b:
991 case 0x3c:
992 case 0x5f:
993 case 0x74:
994 case 0x76:
995 return handle_io_inst(vcpu);
996 case 0x56:
997 return handle_sthyi(vcpu);
998 case 0x7d:
999 return handle_stsi(vcpu);
1000 case 0xaf:
1001 return handle_pqap(vcpu);
1002 case 0xb1:
1003 return handle_stfl(vcpu);
1004 case 0xb2:
1005 return handle_lpswe(vcpu);
1006 default:
1007 return -EOPNOTSUPP;
1008 }
1009 }
1010
handle_epsw(struct kvm_vcpu * vcpu)1011 static int handle_epsw(struct kvm_vcpu *vcpu)
1012 {
1013 int reg1, reg2;
1014
1015 vcpu->stat.instruction_epsw++;
1016
1017 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1018
1019 /* This basically extracts the mask half of the psw. */
1020 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1021 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1022 if (reg2) {
1023 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1024 vcpu->run->s.regs.gprs[reg2] |=
1025 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1026 }
1027 return 0;
1028 }
1029
1030 #define PFMF_RESERVED 0xfffc0101UL
1031 #define PFMF_SK 0x00020000UL
1032 #define PFMF_CF 0x00010000UL
1033 #define PFMF_UI 0x00008000UL
1034 #define PFMF_FSC 0x00007000UL
1035 #define PFMF_NQ 0x00000800UL
1036 #define PFMF_MR 0x00000400UL
1037 #define PFMF_MC 0x00000200UL
1038 #define PFMF_KEY 0x000000feUL
1039
handle_pfmf(struct kvm_vcpu * vcpu)1040 static int handle_pfmf(struct kvm_vcpu *vcpu)
1041 {
1042 bool mr = false, mc = false, nq;
1043 int reg1, reg2;
1044 unsigned long start, end;
1045 unsigned char key;
1046
1047 vcpu->stat.instruction_pfmf++;
1048
1049 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1050
1051 if (!test_kvm_facility(vcpu->kvm, 8))
1052 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1053
1054 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1055 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1056
1057 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1058 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1059
1060 /* Only provide non-quiescing support if enabled for the guest */
1061 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1062 !test_kvm_facility(vcpu->kvm, 14))
1063 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1064
1065 /* Only provide conditional-SSKE support if enabled for the guest */
1066 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1067 test_kvm_facility(vcpu->kvm, 10)) {
1068 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1069 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1070 }
1071
1072 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1073 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1074 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1075 start = kvm_s390_logical_to_effective(vcpu, start);
1076
1077 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1078 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1079 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1080 }
1081
1082 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1083 case 0x00000000:
1084 /* only 4k frames specify a real address */
1085 start = kvm_s390_real_to_abs(vcpu, start);
1086 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1087 break;
1088 case 0x00001000:
1089 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1090 break;
1091 case 0x00002000:
1092 /* only support 2G frame size if EDAT2 is available and we are
1093 not in 24-bit addressing mode */
1094 if (!test_kvm_facility(vcpu->kvm, 78) ||
1095 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1096 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1097 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1098 break;
1099 default:
1100 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1101 }
1102
1103 while (start != end) {
1104 unsigned long vmaddr;
1105 bool unlocked = false;
1106
1107 /* Translate guest address to host address */
1108 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1109 if (kvm_is_error_hva(vmaddr))
1110 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1111
1112 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1113 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1114 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1115 }
1116
1117 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1118 int rc = kvm_s390_skey_check_enable(vcpu);
1119
1120 if (rc)
1121 return rc;
1122 mmap_read_lock(current->mm);
1123 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1124 key, NULL, nq, mr, mc);
1125 if (rc < 0) {
1126 rc = fixup_user_fault(current->mm, vmaddr,
1127 FAULT_FLAG_WRITE, &unlocked);
1128 rc = !rc ? -EAGAIN : rc;
1129 }
1130 mmap_read_unlock(current->mm);
1131 if (rc == -EFAULT)
1132 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1133 if (rc == -EAGAIN)
1134 continue;
1135 if (rc < 0)
1136 return rc;
1137 }
1138 start += PAGE_SIZE;
1139 }
1140 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1141 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1142 vcpu->run->s.regs.gprs[reg2] = end;
1143 } else {
1144 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1145 end = kvm_s390_logical_to_effective(vcpu, end);
1146 vcpu->run->s.regs.gprs[reg2] |= end;
1147 }
1148 }
1149 return 0;
1150 }
1151
1152 /*
1153 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1154 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1155 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1156 {
1157 int r1, r2, nappended, entries;
1158 unsigned long gfn, hva, res, pgstev, ptev;
1159 unsigned long *cbrlo;
1160
1161 /*
1162 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1163 * machine check here we either handle it or crash
1164 */
1165
1166 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1167 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1168 hva = gfn_to_hva(vcpu->kvm, gfn);
1169 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1170
1171 if (kvm_is_error_hva(hva))
1172 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1173
1174 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1175 if (nappended < 0) {
1176 res = orc ? 0x10 : 0;
1177 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1178 return 0;
1179 }
1180 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1181 /*
1182 * Set the block-content state part of the result. 0 means resident, so
1183 * nothing to do if the page is valid. 2 is for preserved pages
1184 * (non-present and non-zero), and 3 for zero pages (non-present and
1185 * zero).
1186 */
1187 if (ptev & _PAGE_INVALID) {
1188 res |= 2;
1189 if (pgstev & _PGSTE_GPS_ZERO)
1190 res |= 1;
1191 }
1192 if (pgstev & _PGSTE_GPS_NODAT)
1193 res |= 0x20;
1194 vcpu->run->s.regs.gprs[r1] = res;
1195 /*
1196 * It is possible that all the normal 511 slots were full, in which case
1197 * we will now write in the 512th slot, which is reserved for host use.
1198 * In both cases we let the normal essa handling code process all the
1199 * slots, including the reserved one, if needed.
1200 */
1201 if (nappended > 0) {
1202 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1203 cbrlo[entries] = gfn << PAGE_SHIFT;
1204 }
1205
1206 if (orc) {
1207 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1208
1209 /* Increment only if we are really flipping the bit */
1210 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1211 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1212 }
1213
1214 return nappended;
1215 }
1216
handle_essa(struct kvm_vcpu * vcpu)1217 static int handle_essa(struct kvm_vcpu *vcpu)
1218 {
1219 /* entries expected to be 1FF */
1220 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1221 unsigned long *cbrlo;
1222 struct gmap *gmap;
1223 int i, orc;
1224
1225 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1226 gmap = vcpu->arch.gmap;
1227 vcpu->stat.instruction_essa++;
1228 if (!vcpu->kvm->arch.use_cmma)
1229 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1230
1231 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1232 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1233 /* Check for invalid operation request code */
1234 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1235 /* ORCs 0-6 are always valid */
1236 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1237 : ESSA_SET_STABLE_IF_RESIDENT))
1238 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1239
1240 if (!vcpu->kvm->arch.migration_mode) {
1241 /*
1242 * CMMA is enabled in the KVM settings, but is disabled in
1243 * the SIE block and in the mm_context, and we are not doing
1244 * a migration. Enable CMMA in the mm_context.
1245 * Since we need to take a write lock to write to the context
1246 * to avoid races with storage keys handling, we check if the
1247 * value really needs to be written to; if the value is
1248 * already correct, we do nothing and avoid the lock.
1249 */
1250 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1251 mmap_write_lock(vcpu->kvm->mm);
1252 vcpu->kvm->mm->context.uses_cmm = 1;
1253 mmap_write_unlock(vcpu->kvm->mm);
1254 }
1255 /*
1256 * If we are here, we are supposed to have CMMA enabled in
1257 * the SIE block. Enabling CMMA works on a per-CPU basis,
1258 * while the context use_cmma flag is per process.
1259 * It's possible that the context flag is enabled and the
1260 * SIE flag is not, so we set the flag always; if it was
1261 * already set, nothing changes, otherwise we enable it
1262 * on this CPU too.
1263 */
1264 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1265 /* Retry the ESSA instruction */
1266 kvm_s390_retry_instr(vcpu);
1267 } else {
1268 int srcu_idx;
1269
1270 mmap_read_lock(vcpu->kvm->mm);
1271 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1272 i = __do_essa(vcpu, orc);
1273 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1274 mmap_read_unlock(vcpu->kvm->mm);
1275 if (i < 0)
1276 return i;
1277 /* Account for the possible extra cbrl entry */
1278 entries += i;
1279 }
1280 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1281 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1282 mmap_read_lock(gmap->mm);
1283 for (i = 0; i < entries; ++i)
1284 __gmap_zap(gmap, cbrlo[i]);
1285 mmap_read_unlock(gmap->mm);
1286 return 0;
1287 }
1288
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1289 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1290 {
1291 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1292 case 0x8a:
1293 case 0x8e:
1294 case 0x8f:
1295 return handle_ipte_interlock(vcpu);
1296 case 0x8d:
1297 return handle_epsw(vcpu);
1298 case 0xab:
1299 return handle_essa(vcpu);
1300 case 0xaf:
1301 return handle_pfmf(vcpu);
1302 default:
1303 return -EOPNOTSUPP;
1304 }
1305 }
1306
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1307 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1308 {
1309 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1310 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1311 int reg, rc, nr_regs;
1312 u32 ctl_array[16];
1313 u64 ga;
1314 u8 ar;
1315
1316 vcpu->stat.instruction_lctl++;
1317
1318 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1319 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1320
1321 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1322
1323 if (ga & 3)
1324 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1325
1326 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1327 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1328
1329 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1330 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1331 if (rc)
1332 return kvm_s390_inject_prog_cond(vcpu, rc);
1333 reg = reg1;
1334 nr_regs = 0;
1335 do {
1336 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1337 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1338 if (reg == reg3)
1339 break;
1340 reg = (reg + 1) % 16;
1341 } while (1);
1342 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1343 return 0;
1344 }
1345
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1346 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1347 {
1348 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1349 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1350 int reg, rc, nr_regs;
1351 u32 ctl_array[16];
1352 u64 ga;
1353 u8 ar;
1354
1355 vcpu->stat.instruction_stctl++;
1356
1357 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1358 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1359
1360 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1361
1362 if (ga & 3)
1363 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1364
1365 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1366 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1367
1368 reg = reg1;
1369 nr_regs = 0;
1370 do {
1371 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1372 if (reg == reg3)
1373 break;
1374 reg = (reg + 1) % 16;
1375 } while (1);
1376 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1377 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1378 }
1379
handle_lctlg(struct kvm_vcpu * vcpu)1380 static int handle_lctlg(struct kvm_vcpu *vcpu)
1381 {
1382 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1383 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1384 int reg, rc, nr_regs;
1385 u64 ctl_array[16];
1386 u64 ga;
1387 u8 ar;
1388
1389 vcpu->stat.instruction_lctlg++;
1390
1391 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1392 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1393
1394 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1395
1396 if (ga & 7)
1397 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1398
1399 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1400 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1401
1402 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1403 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1404 if (rc)
1405 return kvm_s390_inject_prog_cond(vcpu, rc);
1406 reg = reg1;
1407 nr_regs = 0;
1408 do {
1409 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1410 if (reg == reg3)
1411 break;
1412 reg = (reg + 1) % 16;
1413 } while (1);
1414 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1415 return 0;
1416 }
1417
handle_stctg(struct kvm_vcpu * vcpu)1418 static int handle_stctg(struct kvm_vcpu *vcpu)
1419 {
1420 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1421 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1422 int reg, rc, nr_regs;
1423 u64 ctl_array[16];
1424 u64 ga;
1425 u8 ar;
1426
1427 vcpu->stat.instruction_stctg++;
1428
1429 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1430 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1431
1432 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1433
1434 if (ga & 7)
1435 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1436
1437 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1438 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1439
1440 reg = reg1;
1441 nr_regs = 0;
1442 do {
1443 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1444 if (reg == reg3)
1445 break;
1446 reg = (reg + 1) % 16;
1447 } while (1);
1448 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1449 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1450 }
1451
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1452 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1453 {
1454 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1455 case 0x25:
1456 return handle_stctg(vcpu);
1457 case 0x2f:
1458 return handle_lctlg(vcpu);
1459 case 0x60:
1460 case 0x61:
1461 case 0x62:
1462 return handle_ri(vcpu);
1463 default:
1464 return -EOPNOTSUPP;
1465 }
1466 }
1467
handle_tprot(struct kvm_vcpu * vcpu)1468 static int handle_tprot(struct kvm_vcpu *vcpu)
1469 {
1470 u64 address, operand2;
1471 unsigned long gpa;
1472 u8 access_key;
1473 bool writable;
1474 int ret, cc;
1475 u8 ar;
1476
1477 vcpu->stat.instruction_tprot++;
1478
1479 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1480 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1481
1482 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1483 access_key = (operand2 & 0xf0) >> 4;
1484
1485 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1486 ipte_lock(vcpu->kvm);
1487
1488 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1489 GACC_STORE, access_key);
1490 if (ret == 0) {
1491 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1492 } else if (ret == PGM_PROTECTION) {
1493 writable = false;
1494 /* Write protected? Try again with read-only... */
1495 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1496 GACC_FETCH, access_key);
1497 }
1498 if (ret >= 0) {
1499 cc = -1;
1500
1501 /* Fetching permitted; storing permitted */
1502 if (ret == 0 && writable)
1503 cc = 0;
1504 /* Fetching permitted; storing not permitted */
1505 else if (ret == 0 && !writable)
1506 cc = 1;
1507 /* Fetching not permitted; storing not permitted */
1508 else if (ret == PGM_PROTECTION)
1509 cc = 2;
1510 /* Translation not available */
1511 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1512 cc = 3;
1513
1514 if (cc != -1) {
1515 kvm_s390_set_psw_cc(vcpu, cc);
1516 ret = 0;
1517 } else {
1518 ret = kvm_s390_inject_program_int(vcpu, ret);
1519 }
1520 }
1521
1522 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1523 ipte_unlock(vcpu->kvm);
1524 return ret;
1525 }
1526
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1527 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1528 {
1529 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1530 case 0x01:
1531 return handle_tprot(vcpu);
1532 default:
1533 return -EOPNOTSUPP;
1534 }
1535 }
1536
handle_sckpf(struct kvm_vcpu * vcpu)1537 static int handle_sckpf(struct kvm_vcpu *vcpu)
1538 {
1539 u32 value;
1540
1541 vcpu->stat.instruction_sckpf++;
1542
1543 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1544 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1545
1546 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1547 return kvm_s390_inject_program_int(vcpu,
1548 PGM_SPECIFICATION);
1549
1550 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1551 vcpu->arch.sie_block->todpr = value;
1552
1553 return 0;
1554 }
1555
handle_ptff(struct kvm_vcpu * vcpu)1556 static int handle_ptff(struct kvm_vcpu *vcpu)
1557 {
1558 vcpu->stat.instruction_ptff++;
1559
1560 /* we don't emulate any control instructions yet */
1561 kvm_s390_set_psw_cc(vcpu, 3);
1562 return 0;
1563 }
1564
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1565 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1566 {
1567 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1568 case 0x04:
1569 return handle_ptff(vcpu);
1570 case 0x07:
1571 return handle_sckpf(vcpu);
1572 default:
1573 return -EOPNOTSUPP;
1574 }
1575 }
1576