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