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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
33static 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
46int 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
54static 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
74int 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 */
84static 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
123static 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
161static 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
191static 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
217int 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
241static 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
257static 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);
282retry:
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
305static 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);
329retry:
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
354static 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
440static 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
451static 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
481static 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;
533reinject_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
547static 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
580static 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 */
624static 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
697static 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
726int 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
743int 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
773static 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
797static 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
822static 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
849static 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
860static 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(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
928 rc = 0;
929 } else {
930 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
931 }
932 if (rc) {
933 rc = kvm_s390_inject_prog_cond(vcpu, rc);
934 goto out;
935 }
936 if (vcpu->kvm->arch.user_stsi) {
937 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
938 rc = -EREMOTE;
939 }
940 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
941 free_page(mem);
942 kvm_s390_set_psw_cc(vcpu, 0);
943 vcpu->run->s.regs.gprs[0] = 0;
944 return rc;
945out_no_data:
946 kvm_s390_set_psw_cc(vcpu, 3);
947out:
948 free_page(mem);
949 return rc;
950}
951
952int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
953{
954 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
955 case 0x02:
956 return handle_stidp(vcpu);
957 case 0x04:
958 return handle_set_clock(vcpu);
959 case 0x10:
960 return handle_set_prefix(vcpu);
961 case 0x11:
962 return handle_store_prefix(vcpu);
963 case 0x12:
964 return handle_store_cpu_address(vcpu);
965 case 0x14:
966 return kvm_s390_handle_vsie(vcpu);
967 case 0x21:
968 case 0x50:
969 return handle_ipte_interlock(vcpu);
970 case 0x29:
971 return handle_iske(vcpu);
972 case 0x2a:
973 return handle_rrbe(vcpu);
974 case 0x2b:
975 return handle_sske(vcpu);
976 case 0x2c:
977 return handle_test_block(vcpu);
978 case 0x30:
979 case 0x31:
980 case 0x32:
981 case 0x33:
982 case 0x34:
983 case 0x35:
984 case 0x36:
985 case 0x37:
986 case 0x38:
987 case 0x39:
988 case 0x3a:
989 case 0x3b:
990 case 0x3c:
991 case 0x5f:
992 case 0x74:
993 case 0x76:
994 return handle_io_inst(vcpu);
995 case 0x56:
996 return handle_sthyi(vcpu);
997 case 0x7d:
998 return handle_stsi(vcpu);
999 case 0xaf:
1000 return handle_pqap(vcpu);
1001 case 0xb1:
1002 return handle_stfl(vcpu);
1003 case 0xb2:
1004 return handle_lpswe(vcpu);
1005 default:
1006 return -EOPNOTSUPP;
1007 }
1008}
1009
1010static int handle_epsw(struct kvm_vcpu *vcpu)
1011{
1012 int reg1, reg2;
1013
1014 vcpu->stat.instruction_epsw++;
1015
1016 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1017
1018 /* This basically extracts the mask half of the psw. */
1019 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1020 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1021 if (reg2) {
1022 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1023 vcpu->run->s.regs.gprs[reg2] |=
1024 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1025 }
1026 return 0;
1027}
1028
1029#define PFMF_RESERVED 0xfffc0101UL
1030#define PFMF_SK 0x00020000UL
1031#define PFMF_CF 0x00010000UL
1032#define PFMF_UI 0x00008000UL
1033#define PFMF_FSC 0x00007000UL
1034#define PFMF_NQ 0x00000800UL
1035#define PFMF_MR 0x00000400UL
1036#define PFMF_MC 0x00000200UL
1037#define PFMF_KEY 0x000000feUL
1038
1039static int handle_pfmf(struct kvm_vcpu *vcpu)
1040{
1041 bool mr = false, mc = false, nq;
1042 int reg1, reg2;
1043 unsigned long start, end;
1044 unsigned char key;
1045
1046 vcpu->stat.instruction_pfmf++;
1047
1048 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1049
1050 if (!test_kvm_facility(vcpu->kvm, 8))
1051 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1052
1053 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1054 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1055
1056 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1057 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1058
1059 /* Only provide non-quiescing support if enabled for the guest */
1060 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1061 !test_kvm_facility(vcpu->kvm, 14))
1062 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1063
1064 /* Only provide conditional-SSKE support if enabled for the guest */
1065 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1066 test_kvm_facility(vcpu->kvm, 10)) {
1067 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1068 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1069 }
1070
1071 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1072 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1073 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1074 start = kvm_s390_logical_to_effective(vcpu, start);
1075
1076 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1077 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1078 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1079 }
1080
1081 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1082 case 0x00000000:
1083 /* only 4k frames specify a real address */
1084 start = kvm_s390_real_to_abs(vcpu, start);
1085 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1086 break;
1087 case 0x00001000:
1088 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1089 break;
1090 case 0x00002000:
1091 /* only support 2G frame size if EDAT2 is available and we are
1092 not in 24-bit addressing mode */
1093 if (!test_kvm_facility(vcpu->kvm, 78) ||
1094 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1095 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1096 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1097 break;
1098 default:
1099 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1100 }
1101
1102 while (start != end) {
1103 unsigned long vmaddr;
1104 bool unlocked = false;
1105
1106 /* Translate guest address to host address */
1107 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1108 if (kvm_is_error_hva(vmaddr))
1109 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1110
1111 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1112 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1113 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1114 }
1115
1116 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1117 int rc = kvm_s390_skey_check_enable(vcpu);
1118
1119 if (rc)
1120 return rc;
1121 mmap_read_lock(current->mm);
1122 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1123 key, NULL, nq, mr, mc);
1124 if (rc < 0) {
1125 rc = fixup_user_fault(current->mm, vmaddr,
1126 FAULT_FLAG_WRITE, &unlocked);
1127 rc = !rc ? -EAGAIN : rc;
1128 }
1129 mmap_read_unlock(current->mm);
1130 if (rc == -EFAULT)
1131 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1132 if (rc == -EAGAIN)
1133 continue;
1134 if (rc < 0)
1135 return rc;
1136 }
1137 start += PAGE_SIZE;
1138 }
1139 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1140 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1141 vcpu->run->s.regs.gprs[reg2] = end;
1142 } else {
1143 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1144 end = kvm_s390_logical_to_effective(vcpu, end);
1145 vcpu->run->s.regs.gprs[reg2] |= end;
1146 }
1147 }
1148 return 0;
1149}
1150
1151/*
1152 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1153 */
1154static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1155{
1156 int r1, r2, nappended, entries;
1157 unsigned long gfn, hva, res, pgstev, ptev;
1158 unsigned long *cbrlo;
1159
1160 /*
1161 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1162 * machine check here we either handle it or crash
1163 */
1164
1165 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1166 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1167 hva = gfn_to_hva(vcpu->kvm, gfn);
1168 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1169
1170 if (kvm_is_error_hva(hva))
1171 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1172
1173 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1174 if (nappended < 0) {
1175 res = orc ? 0x10 : 0;
1176 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1177 return 0;
1178 }
1179 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1180 /*
1181 * Set the block-content state part of the result. 0 means resident, so
1182 * nothing to do if the page is valid. 2 is for preserved pages
1183 * (non-present and non-zero), and 3 for zero pages (non-present and
1184 * zero).
1185 */
1186 if (ptev & _PAGE_INVALID) {
1187 res |= 2;
1188 if (pgstev & _PGSTE_GPS_ZERO)
1189 res |= 1;
1190 }
1191 if (pgstev & _PGSTE_GPS_NODAT)
1192 res |= 0x20;
1193 vcpu->run->s.regs.gprs[r1] = res;
1194 /*
1195 * It is possible that all the normal 511 slots were full, in which case
1196 * we will now write in the 512th slot, which is reserved for host use.
1197 * In both cases we let the normal essa handling code process all the
1198 * slots, including the reserved one, if needed.
1199 */
1200 if (nappended > 0) {
1201 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1202 cbrlo[entries] = gfn << PAGE_SHIFT;
1203 }
1204
1205 if (orc) {
1206 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1207
1208 /* Increment only if we are really flipping the bit */
1209 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1210 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1211 }
1212
1213 return nappended;
1214}
1215
1216static int handle_essa(struct kvm_vcpu *vcpu)
1217{
1218 /* entries expected to be 1FF */
1219 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1220 unsigned long *cbrlo;
1221 struct gmap *gmap;
1222 int i, orc;
1223
1224 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1225 gmap = vcpu->arch.gmap;
1226 vcpu->stat.instruction_essa++;
1227 if (!vcpu->kvm->arch.use_cmma)
1228 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1229
1230 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1231 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1232 /* Check for invalid operation request code */
1233 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1234 /* ORCs 0-6 are always valid */
1235 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1236 : ESSA_SET_STABLE_IF_RESIDENT))
1237 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1238
1239 if (!vcpu->kvm->arch.migration_mode) {
1240 /*
1241 * CMMA is enabled in the KVM settings, but is disabled in
1242 * the SIE block and in the mm_context, and we are not doing
1243 * a migration. Enable CMMA in the mm_context.
1244 * Since we need to take a write lock to write to the context
1245 * to avoid races with storage keys handling, we check if the
1246 * value really needs to be written to; if the value is
1247 * already correct, we do nothing and avoid the lock.
1248 */
1249 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1250 mmap_write_lock(vcpu->kvm->mm);
1251 vcpu->kvm->mm->context.uses_cmm = 1;
1252 mmap_write_unlock(vcpu->kvm->mm);
1253 }
1254 /*
1255 * If we are here, we are supposed to have CMMA enabled in
1256 * the SIE block. Enabling CMMA works on a per-CPU basis,
1257 * while the context use_cmma flag is per process.
1258 * It's possible that the context flag is enabled and the
1259 * SIE flag is not, so we set the flag always; if it was
1260 * already set, nothing changes, otherwise we enable it
1261 * on this CPU too.
1262 */
1263 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1264 /* Retry the ESSA instruction */
1265 kvm_s390_retry_instr(vcpu);
1266 } else {
1267 int srcu_idx;
1268
1269 mmap_read_lock(vcpu->kvm->mm);
1270 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1271 i = __do_essa(vcpu, orc);
1272 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1273 mmap_read_unlock(vcpu->kvm->mm);
1274 if (i < 0)
1275 return i;
1276 /* Account for the possible extra cbrl entry */
1277 entries += i;
1278 }
1279 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1280 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1281 mmap_read_lock(gmap->mm);
1282 for (i = 0; i < entries; ++i)
1283 __gmap_zap(gmap, cbrlo[i]);
1284 mmap_read_unlock(gmap->mm);
1285 return 0;
1286}
1287
1288int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1289{
1290 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1291 case 0x8a:
1292 case 0x8e:
1293 case 0x8f:
1294 return handle_ipte_interlock(vcpu);
1295 case 0x8d:
1296 return handle_epsw(vcpu);
1297 case 0xab:
1298 return handle_essa(vcpu);
1299 case 0xaf:
1300 return handle_pfmf(vcpu);
1301 default:
1302 return -EOPNOTSUPP;
1303 }
1304}
1305
1306int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1307{
1308 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1309 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1310 int reg, rc, nr_regs;
1311 u32 ctl_array[16];
1312 u64 ga;
1313 u8 ar;
1314
1315 vcpu->stat.instruction_lctl++;
1316
1317 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1318 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1319
1320 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1321
1322 if (ga & 3)
1323 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1324
1325 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1326 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1327
1328 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1329 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1330 if (rc)
1331 return kvm_s390_inject_prog_cond(vcpu, rc);
1332 reg = reg1;
1333 nr_regs = 0;
1334 do {
1335 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1336 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1337 if (reg == reg3)
1338 break;
1339 reg = (reg + 1) % 16;
1340 } while (1);
1341 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1342 return 0;
1343}
1344
1345int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1346{
1347 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1348 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1349 int reg, rc, nr_regs;
1350 u32 ctl_array[16];
1351 u64 ga;
1352 u8 ar;
1353
1354 vcpu->stat.instruction_stctl++;
1355
1356 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1357 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1358
1359 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1360
1361 if (ga & 3)
1362 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1363
1364 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1365 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1366
1367 reg = reg1;
1368 nr_regs = 0;
1369 do {
1370 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1371 if (reg == reg3)
1372 break;
1373 reg = (reg + 1) % 16;
1374 } while (1);
1375 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1376 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1377}
1378
1379static int handle_lctlg(struct kvm_vcpu *vcpu)
1380{
1381 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1382 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1383 int reg, rc, nr_regs;
1384 u64 ctl_array[16];
1385 u64 ga;
1386 u8 ar;
1387
1388 vcpu->stat.instruction_lctlg++;
1389
1390 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1391 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1392
1393 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1394
1395 if (ga & 7)
1396 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1397
1398 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1399 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1400
1401 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1402 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1403 if (rc)
1404 return kvm_s390_inject_prog_cond(vcpu, rc);
1405 reg = reg1;
1406 nr_regs = 0;
1407 do {
1408 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1409 if (reg == reg3)
1410 break;
1411 reg = (reg + 1) % 16;
1412 } while (1);
1413 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1414 return 0;
1415}
1416
1417static int handle_stctg(struct kvm_vcpu *vcpu)
1418{
1419 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1420 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1421 int reg, rc, nr_regs;
1422 u64 ctl_array[16];
1423 u64 ga;
1424 u8 ar;
1425
1426 vcpu->stat.instruction_stctg++;
1427
1428 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1429 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1430
1431 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1432
1433 if (ga & 7)
1434 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1435
1436 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1437 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1438
1439 reg = reg1;
1440 nr_regs = 0;
1441 do {
1442 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1443 if (reg == reg3)
1444 break;
1445 reg = (reg + 1) % 16;
1446 } while (1);
1447 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1448 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1449}
1450
1451int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1452{
1453 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1454 case 0x25:
1455 return handle_stctg(vcpu);
1456 case 0x2f:
1457 return handle_lctlg(vcpu);
1458 case 0x60:
1459 case 0x61:
1460 case 0x62:
1461 return handle_ri(vcpu);
1462 default:
1463 return -EOPNOTSUPP;
1464 }
1465}
1466
1467static int handle_tprot(struct kvm_vcpu *vcpu)
1468{
1469 u64 address, operand2;
1470 unsigned long gpa;
1471 u8 access_key;
1472 bool writable;
1473 int ret, cc;
1474 u8 ar;
1475
1476 vcpu->stat.instruction_tprot++;
1477
1478 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1479 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1480
1481 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1482 access_key = (operand2 & 0xf0) >> 4;
1483
1484 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1485 ipte_lock(vcpu->kvm);
1486
1487 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1488 GACC_STORE, access_key);
1489 if (ret == 0) {
1490 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1491 } else if (ret == PGM_PROTECTION) {
1492 writable = false;
1493 /* Write protected? Try again with read-only... */
1494 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1495 GACC_FETCH, access_key);
1496 }
1497 if (ret >= 0) {
1498 cc = -1;
1499
1500 /* Fetching permitted; storing permitted */
1501 if (ret == 0 && writable)
1502 cc = 0;
1503 /* Fetching permitted; storing not permitted */
1504 else if (ret == 0 && !writable)
1505 cc = 1;
1506 /* Fetching not permitted; storing not permitted */
1507 else if (ret == PGM_PROTECTION)
1508 cc = 2;
1509 /* Translation not available */
1510 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1511 cc = 3;
1512
1513 if (cc != -1) {
1514 kvm_s390_set_psw_cc(vcpu, cc);
1515 ret = 0;
1516 } else {
1517 ret = kvm_s390_inject_program_int(vcpu, ret);
1518 }
1519 }
1520
1521 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1522 ipte_unlock(vcpu->kvm);
1523 return ret;
1524}
1525
1526int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1527{
1528 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1529 case 0x01:
1530 return handle_tprot(vcpu);
1531 default:
1532 return -EOPNOTSUPP;
1533 }
1534}
1535
1536static int handle_sckpf(struct kvm_vcpu *vcpu)
1537{
1538 u32 value;
1539
1540 vcpu->stat.instruction_sckpf++;
1541
1542 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1543 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1544
1545 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1546 return kvm_s390_inject_program_int(vcpu,
1547 PGM_SPECIFICATION);
1548
1549 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1550 vcpu->arch.sie_block->todpr = value;
1551
1552 return 0;
1553}
1554
1555static int handle_ptff(struct kvm_vcpu *vcpu)
1556{
1557 vcpu->stat.instruction_ptff++;
1558
1559 /* we don't emulate any control instructions yet */
1560 kvm_s390_set_psw_cc(vcpu, 3);
1561 return 0;
1562}
1563
1564int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1565{
1566 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1567 case 0x04:
1568 return handle_ptff(vcpu);
1569 case 0x07:
1570 return handle_sckpf(vcpu);
1571 default:
1572 return -EOPNOTSUPP;
1573 }
1574}
1/*
2 * handling privileged instructions
3 *
4 * Copyright IBM Corp. 2008, 2013
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
12 */
13
14#include <linux/kvm.h>
15#include <linux/gfp.h>
16#include <linux/errno.h>
17#include <linux/compat.h>
18#include <asm/asm-offsets.h>
19#include <asm/facility.h>
20#include <asm/current.h>
21#include <asm/debug.h>
22#include <asm/ebcdic.h>
23#include <asm/sysinfo.h>
24#include <asm/pgtable.h>
25#include <asm/pgalloc.h>
26#include <asm/gmap.h>
27#include <asm/io.h>
28#include <asm/ptrace.h>
29#include <asm/compat.h>
30#include <asm/sclp.h>
31#include "gaccess.h"
32#include "kvm-s390.h"
33#include "trace.h"
34
35static int handle_ri(struct kvm_vcpu *vcpu)
36{
37 if (test_kvm_facility(vcpu->kvm, 64)) {
38 vcpu->arch.sie_block->ecb3 |= 0x01;
39 kvm_s390_retry_instr(vcpu);
40 return 0;
41 } else
42 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
43}
44
45int 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
53/* Handle SCK (SET CLOCK) interception */
54static int handle_set_clock(struct kvm_vcpu *vcpu)
55{
56 int rc;
57 ar_t ar;
58 u64 op2, val;
59
60 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
61 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
62
63 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
64 if (op2 & 7) /* Operand must be on a doubleword boundary */
65 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
66 rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
67 if (rc)
68 return kvm_s390_inject_prog_cond(vcpu, rc);
69
70 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
71 kvm_s390_set_tod_clock(vcpu->kvm, val);
72
73 kvm_s390_set_psw_cc(vcpu, 0);
74 return 0;
75}
76
77static int handle_set_prefix(struct kvm_vcpu *vcpu)
78{
79 u64 operand2;
80 u32 address;
81 int rc;
82 ar_t ar;
83
84 vcpu->stat.instruction_spx++;
85
86 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
87 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
88
89 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
90
91 /* must be word boundary */
92 if (operand2 & 3)
93 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
94
95 /* get the value */
96 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
97 if (rc)
98 return kvm_s390_inject_prog_cond(vcpu, rc);
99
100 address &= 0x7fffe000u;
101
102 /*
103 * Make sure the new value is valid memory. We only need to check the
104 * first page, since address is 8k aligned and memory pieces are always
105 * at least 1MB aligned and have at least a size of 1MB.
106 */
107 if (kvm_is_error_gpa(vcpu->kvm, address))
108 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
109
110 kvm_s390_set_prefix(vcpu, address);
111 trace_kvm_s390_handle_prefix(vcpu, 1, address);
112 return 0;
113}
114
115static int handle_store_prefix(struct kvm_vcpu *vcpu)
116{
117 u64 operand2;
118 u32 address;
119 int rc;
120 ar_t ar;
121
122 vcpu->stat.instruction_stpx++;
123
124 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
125 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
126
127 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
128
129 /* must be word boundary */
130 if (operand2 & 3)
131 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
132
133 address = kvm_s390_get_prefix(vcpu);
134
135 /* get the value */
136 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
137 if (rc)
138 return kvm_s390_inject_prog_cond(vcpu, rc);
139
140 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
141 trace_kvm_s390_handle_prefix(vcpu, 0, address);
142 return 0;
143}
144
145static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
146{
147 u16 vcpu_id = vcpu->vcpu_id;
148 u64 ga;
149 int rc;
150 ar_t ar;
151
152 vcpu->stat.instruction_stap++;
153
154 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
155 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
156
157 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
158
159 if (ga & 1)
160 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
161
162 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
163 if (rc)
164 return kvm_s390_inject_prog_cond(vcpu, rc);
165
166 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
167 trace_kvm_s390_handle_stap(vcpu, ga);
168 return 0;
169}
170
171static int __skey_check_enable(struct kvm_vcpu *vcpu)
172{
173 int rc = 0;
174
175 trace_kvm_s390_skey_related_inst(vcpu);
176 if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
177 return rc;
178
179 rc = s390_enable_skey();
180 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
181 if (!rc)
182 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
183 return rc;
184}
185
186static int try_handle_skey(struct kvm_vcpu *vcpu)
187{
188 int rc;
189
190 vcpu->stat.instruction_storage_key++;
191 rc = __skey_check_enable(vcpu);
192 if (rc)
193 return rc;
194 if (sclp.has_skey) {
195 /* with storage-key facility, SIE interprets it for us */
196 kvm_s390_retry_instr(vcpu);
197 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
198 return -EAGAIN;
199 }
200 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
201 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
202 return 0;
203}
204
205static int handle_iske(struct kvm_vcpu *vcpu)
206{
207 unsigned long addr;
208 unsigned char key;
209 int reg1, reg2;
210 int rc;
211
212 rc = try_handle_skey(vcpu);
213 if (rc)
214 return rc != -EAGAIN ? rc : 0;
215
216 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
217
218 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
219 addr = kvm_s390_logical_to_effective(vcpu, addr);
220 addr = kvm_s390_real_to_abs(vcpu, addr);
221 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
222 if (kvm_is_error_hva(addr))
223 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
224
225 down_read(¤t->mm->mmap_sem);
226 rc = get_guest_storage_key(current->mm, addr, &key);
227 up_read(¤t->mm->mmap_sem);
228 if (rc)
229 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
230 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
231 vcpu->run->s.regs.gprs[reg1] |= key;
232 return 0;
233}
234
235static int handle_rrbe(struct kvm_vcpu *vcpu)
236{
237 unsigned long addr;
238 int reg1, reg2;
239 int rc;
240
241 rc = try_handle_skey(vcpu);
242 if (rc)
243 return rc != -EAGAIN ? rc : 0;
244
245 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
246
247 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
248 addr = kvm_s390_logical_to_effective(vcpu, addr);
249 addr = kvm_s390_real_to_abs(vcpu, addr);
250 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
251 if (kvm_is_error_hva(addr))
252 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
253
254 down_read(¤t->mm->mmap_sem);
255 rc = reset_guest_reference_bit(current->mm, addr);
256 up_read(¤t->mm->mmap_sem);
257 if (rc < 0)
258 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
259
260 kvm_s390_set_psw_cc(vcpu, rc);
261 return 0;
262}
263
264#define SSKE_NQ 0x8
265#define SSKE_MR 0x4
266#define SSKE_MC 0x2
267#define SSKE_MB 0x1
268static int handle_sske(struct kvm_vcpu *vcpu)
269{
270 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
271 unsigned long start, end;
272 unsigned char key, oldkey;
273 int reg1, reg2;
274 int rc;
275
276 rc = try_handle_skey(vcpu);
277 if (rc)
278 return rc != -EAGAIN ? rc : 0;
279
280 if (!test_kvm_facility(vcpu->kvm, 8))
281 m3 &= ~SSKE_MB;
282 if (!test_kvm_facility(vcpu->kvm, 10))
283 m3 &= ~(SSKE_MC | SSKE_MR);
284 if (!test_kvm_facility(vcpu->kvm, 14))
285 m3 &= ~SSKE_NQ;
286
287 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
288
289 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
290 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
291 start = kvm_s390_logical_to_effective(vcpu, start);
292 if (m3 & SSKE_MB) {
293 /* start already designates an absolute address */
294 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
295 } else {
296 start = kvm_s390_real_to_abs(vcpu, start);
297 end = start + PAGE_SIZE;
298 }
299
300 while (start != end) {
301 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
302
303 if (kvm_is_error_hva(addr))
304 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
305
306 down_read(¤t->mm->mmap_sem);
307 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
308 m3 & SSKE_NQ, m3 & SSKE_MR,
309 m3 & SSKE_MC);
310 up_read(¤t->mm->mmap_sem);
311 if (rc < 0)
312 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
313 start += PAGE_SIZE;
314 };
315
316 if (m3 & (SSKE_MC | SSKE_MR)) {
317 if (m3 & SSKE_MB) {
318 /* skey in reg1 is unpredictable */
319 kvm_s390_set_psw_cc(vcpu, 3);
320 } else {
321 kvm_s390_set_psw_cc(vcpu, rc);
322 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
323 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
324 }
325 }
326 if (m3 & SSKE_MB) {
327 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT)
328 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
329 else
330 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
331 end = kvm_s390_logical_to_effective(vcpu, end);
332 vcpu->run->s.regs.gprs[reg2] |= end;
333 }
334 return 0;
335}
336
337static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
338{
339 vcpu->stat.instruction_ipte_interlock++;
340 if (psw_bits(vcpu->arch.sie_block->gpsw).p)
341 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
342 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
343 kvm_s390_retry_instr(vcpu);
344 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
345 return 0;
346}
347
348static int handle_test_block(struct kvm_vcpu *vcpu)
349{
350 gpa_t addr;
351 int reg2;
352
353 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
354 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
355
356 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
357 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
358 addr = kvm_s390_logical_to_effective(vcpu, addr);
359 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
360 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
361 addr = kvm_s390_real_to_abs(vcpu, addr);
362
363 if (kvm_is_error_gpa(vcpu->kvm, addr))
364 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
365 /*
366 * We don't expect errors on modern systems, and do not care
367 * about storage keys (yet), so let's just clear the page.
368 */
369 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
370 return -EFAULT;
371 kvm_s390_set_psw_cc(vcpu, 0);
372 vcpu->run->s.regs.gprs[0] = 0;
373 return 0;
374}
375
376static int handle_tpi(struct kvm_vcpu *vcpu)
377{
378 struct kvm_s390_interrupt_info *inti;
379 unsigned long len;
380 u32 tpi_data[3];
381 int rc;
382 u64 addr;
383 ar_t ar;
384
385 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
386 if (addr & 3)
387 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
388
389 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
390 if (!inti) {
391 kvm_s390_set_psw_cc(vcpu, 0);
392 return 0;
393 }
394
395 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
396 tpi_data[1] = inti->io.io_int_parm;
397 tpi_data[2] = inti->io.io_int_word;
398 if (addr) {
399 /*
400 * Store the two-word I/O interruption code into the
401 * provided area.
402 */
403 len = sizeof(tpi_data) - 4;
404 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
405 if (rc) {
406 rc = kvm_s390_inject_prog_cond(vcpu, rc);
407 goto reinject_interrupt;
408 }
409 } else {
410 /*
411 * Store the three-word I/O interruption code into
412 * the appropriate lowcore area.
413 */
414 len = sizeof(tpi_data);
415 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
416 /* failed writes to the low core are not recoverable */
417 rc = -EFAULT;
418 goto reinject_interrupt;
419 }
420 }
421
422 /* irq was successfully handed to the guest */
423 kfree(inti);
424 kvm_s390_set_psw_cc(vcpu, 1);
425 return 0;
426reinject_interrupt:
427 /*
428 * If we encounter a problem storing the interruption code, the
429 * instruction is suppressed from the guest's view: reinject the
430 * interrupt.
431 */
432 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
433 kfree(inti);
434 rc = -EFAULT;
435 }
436 /* don't set the cc, a pgm irq was injected or we drop to user space */
437 return rc ? -EFAULT : 0;
438}
439
440static int handle_tsch(struct kvm_vcpu *vcpu)
441{
442 struct kvm_s390_interrupt_info *inti = NULL;
443 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
444
445 /* a valid schid has at least one bit set */
446 if (vcpu->run->s.regs.gprs[1])
447 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
448 vcpu->run->s.regs.gprs[1]);
449
450 /*
451 * Prepare exit to userspace.
452 * We indicate whether we dequeued a pending I/O interrupt
453 * so that userspace can re-inject it if the instruction gets
454 * a program check. While this may re-order the pending I/O
455 * interrupts, this is no problem since the priority is kept
456 * intact.
457 */
458 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
459 vcpu->run->s390_tsch.dequeued = !!inti;
460 if (inti) {
461 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
462 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
463 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
464 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
465 }
466 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
467 kfree(inti);
468 return -EREMOTE;
469}
470
471static int handle_io_inst(struct kvm_vcpu *vcpu)
472{
473 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
474
475 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
476 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
477
478 if (vcpu->kvm->arch.css_support) {
479 /*
480 * Most I/O instructions will be handled by userspace.
481 * Exceptions are tpi and the interrupt portion of tsch.
482 */
483 if (vcpu->arch.sie_block->ipa == 0xb236)
484 return handle_tpi(vcpu);
485 if (vcpu->arch.sie_block->ipa == 0xb235)
486 return handle_tsch(vcpu);
487 /* Handle in userspace. */
488 return -EOPNOTSUPP;
489 } else {
490 /*
491 * Set condition code 3 to stop the guest from issuing channel
492 * I/O instructions.
493 */
494 kvm_s390_set_psw_cc(vcpu, 3);
495 return 0;
496 }
497}
498
499static int handle_stfl(struct kvm_vcpu *vcpu)
500{
501 int rc;
502 unsigned int fac;
503
504 vcpu->stat.instruction_stfl++;
505
506 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
507 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
508
509 /*
510 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
511 * into a u32 memory representation. They will remain bits 0-31.
512 */
513 fac = *vcpu->kvm->arch.model.fac_list >> 32;
514 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
515 &fac, sizeof(fac));
516 if (rc)
517 return rc;
518 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
519 trace_kvm_s390_handle_stfl(vcpu, fac);
520 return 0;
521}
522
523#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
524#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
525#define PSW_ADDR_24 0x0000000000ffffffUL
526#define PSW_ADDR_31 0x000000007fffffffUL
527
528int is_valid_psw(psw_t *psw)
529{
530 if (psw->mask & PSW_MASK_UNASSIGNED)
531 return 0;
532 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
533 if (psw->addr & ~PSW_ADDR_31)
534 return 0;
535 }
536 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
537 return 0;
538 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
539 return 0;
540 if (psw->addr & 1)
541 return 0;
542 return 1;
543}
544
545int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
546{
547 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
548 psw_compat_t new_psw;
549 u64 addr;
550 int rc;
551 ar_t ar;
552
553 if (gpsw->mask & PSW_MASK_PSTATE)
554 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
555
556 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
557 if (addr & 7)
558 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
559
560 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
561 if (rc)
562 return kvm_s390_inject_prog_cond(vcpu, rc);
563 if (!(new_psw.mask & PSW32_MASK_BASE))
564 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
565 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
566 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
567 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
568 if (!is_valid_psw(gpsw))
569 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
570 return 0;
571}
572
573static int handle_lpswe(struct kvm_vcpu *vcpu)
574{
575 psw_t new_psw;
576 u64 addr;
577 int rc;
578 ar_t ar;
579
580 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
581 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
582
583 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
584 if (addr & 7)
585 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
586 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
587 if (rc)
588 return kvm_s390_inject_prog_cond(vcpu, rc);
589 vcpu->arch.sie_block->gpsw = new_psw;
590 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
591 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
592 return 0;
593}
594
595static int handle_stidp(struct kvm_vcpu *vcpu)
596{
597 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
598 u64 operand2;
599 int rc;
600 ar_t ar;
601
602 vcpu->stat.instruction_stidp++;
603
604 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
605 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
606
607 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
608
609 if (operand2 & 7)
610 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
611
612 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
613 if (rc)
614 return kvm_s390_inject_prog_cond(vcpu, rc);
615
616 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
617 return 0;
618}
619
620static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
621{
622 int cpus = 0;
623 int n;
624
625 cpus = atomic_read(&vcpu->kvm->online_vcpus);
626
627 /* deal with other level 3 hypervisors */
628 if (stsi(mem, 3, 2, 2))
629 mem->count = 0;
630 if (mem->count < 8)
631 mem->count++;
632 for (n = mem->count - 1; n > 0 ; n--)
633 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
634
635 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
636 mem->vm[0].cpus_total = cpus;
637 mem->vm[0].cpus_configured = cpus;
638 mem->vm[0].cpus_standby = 0;
639 mem->vm[0].cpus_reserved = 0;
640 mem->vm[0].caf = 1000;
641 memcpy(mem->vm[0].name, "KVMguest", 8);
642 ASCEBC(mem->vm[0].name, 8);
643 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
644 ASCEBC(mem->vm[0].cpi, 16);
645}
646
647static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
648 u8 fc, u8 sel1, u16 sel2)
649{
650 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
651 vcpu->run->s390_stsi.addr = addr;
652 vcpu->run->s390_stsi.ar = ar;
653 vcpu->run->s390_stsi.fc = fc;
654 vcpu->run->s390_stsi.sel1 = sel1;
655 vcpu->run->s390_stsi.sel2 = sel2;
656}
657
658static int handle_stsi(struct kvm_vcpu *vcpu)
659{
660 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
661 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
662 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
663 unsigned long mem = 0;
664 u64 operand2;
665 int rc = 0;
666 ar_t ar;
667
668 vcpu->stat.instruction_stsi++;
669 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
670
671 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
672 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
673
674 if (fc > 3) {
675 kvm_s390_set_psw_cc(vcpu, 3);
676 return 0;
677 }
678
679 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
680 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
681 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
682
683 if (fc == 0) {
684 vcpu->run->s.regs.gprs[0] = 3 << 28;
685 kvm_s390_set_psw_cc(vcpu, 0);
686 return 0;
687 }
688
689 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
690
691 if (operand2 & 0xfff)
692 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
693
694 switch (fc) {
695 case 1: /* same handling for 1 and 2 */
696 case 2:
697 mem = get_zeroed_page(GFP_KERNEL);
698 if (!mem)
699 goto out_no_data;
700 if (stsi((void *) mem, fc, sel1, sel2))
701 goto out_no_data;
702 break;
703 case 3:
704 if (sel1 != 2 || sel2 != 2)
705 goto out_no_data;
706 mem = get_zeroed_page(GFP_KERNEL);
707 if (!mem)
708 goto out_no_data;
709 handle_stsi_3_2_2(vcpu, (void *) mem);
710 break;
711 }
712
713 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
714 if (rc) {
715 rc = kvm_s390_inject_prog_cond(vcpu, rc);
716 goto out;
717 }
718 if (vcpu->kvm->arch.user_stsi) {
719 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
720 rc = -EREMOTE;
721 }
722 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
723 free_page(mem);
724 kvm_s390_set_psw_cc(vcpu, 0);
725 vcpu->run->s.regs.gprs[0] = 0;
726 return rc;
727out_no_data:
728 kvm_s390_set_psw_cc(vcpu, 3);
729out:
730 free_page(mem);
731 return rc;
732}
733
734static const intercept_handler_t b2_handlers[256] = {
735 [0x02] = handle_stidp,
736 [0x04] = handle_set_clock,
737 [0x10] = handle_set_prefix,
738 [0x11] = handle_store_prefix,
739 [0x12] = handle_store_cpu_address,
740 [0x14] = kvm_s390_handle_vsie,
741 [0x21] = handle_ipte_interlock,
742 [0x29] = handle_iske,
743 [0x2a] = handle_rrbe,
744 [0x2b] = handle_sske,
745 [0x2c] = handle_test_block,
746 [0x30] = handle_io_inst,
747 [0x31] = handle_io_inst,
748 [0x32] = handle_io_inst,
749 [0x33] = handle_io_inst,
750 [0x34] = handle_io_inst,
751 [0x35] = handle_io_inst,
752 [0x36] = handle_io_inst,
753 [0x37] = handle_io_inst,
754 [0x38] = handle_io_inst,
755 [0x39] = handle_io_inst,
756 [0x3a] = handle_io_inst,
757 [0x3b] = handle_io_inst,
758 [0x3c] = handle_io_inst,
759 [0x50] = handle_ipte_interlock,
760 [0x5f] = handle_io_inst,
761 [0x74] = handle_io_inst,
762 [0x76] = handle_io_inst,
763 [0x7d] = handle_stsi,
764 [0xb1] = handle_stfl,
765 [0xb2] = handle_lpswe,
766};
767
768int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
769{
770 intercept_handler_t handler;
771
772 /*
773 * A lot of B2 instructions are priviledged. Here we check for
774 * the privileged ones, that we can handle in the kernel.
775 * Anything else goes to userspace.
776 */
777 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
778 if (handler)
779 return handler(vcpu);
780
781 return -EOPNOTSUPP;
782}
783
784static int handle_epsw(struct kvm_vcpu *vcpu)
785{
786 int reg1, reg2;
787
788 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
789
790 /* This basically extracts the mask half of the psw. */
791 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
792 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
793 if (reg2) {
794 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
795 vcpu->run->s.regs.gprs[reg2] |=
796 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
797 }
798 return 0;
799}
800
801#define PFMF_RESERVED 0xfffc0101UL
802#define PFMF_SK 0x00020000UL
803#define PFMF_CF 0x00010000UL
804#define PFMF_UI 0x00008000UL
805#define PFMF_FSC 0x00007000UL
806#define PFMF_NQ 0x00000800UL
807#define PFMF_MR 0x00000400UL
808#define PFMF_MC 0x00000200UL
809#define PFMF_KEY 0x000000feUL
810
811static int handle_pfmf(struct kvm_vcpu *vcpu)
812{
813 bool mr = false, mc = false, nq;
814 int reg1, reg2;
815 unsigned long start, end;
816 unsigned char key;
817
818 vcpu->stat.instruction_pfmf++;
819
820 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
821
822 if (!test_kvm_facility(vcpu->kvm, 8))
823 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
824
825 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
826 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
827
828 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
829 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
830
831 /* Only provide non-quiescing support if enabled for the guest */
832 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
833 !test_kvm_facility(vcpu->kvm, 14))
834 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
835
836 /* Only provide conditional-SSKE support if enabled for the guest */
837 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
838 test_kvm_facility(vcpu->kvm, 10)) {
839 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
840 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
841 }
842
843 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
844 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
845 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
846 start = kvm_s390_logical_to_effective(vcpu, start);
847
848 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
849 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
850 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
851 }
852
853 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
854 case 0x00000000:
855 /* only 4k frames specify a real address */
856 start = kvm_s390_real_to_abs(vcpu, start);
857 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
858 break;
859 case 0x00001000:
860 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
861 break;
862 case 0x00002000:
863 /* only support 2G frame size if EDAT2 is available and we are
864 not in 24-bit addressing mode */
865 if (!test_kvm_facility(vcpu->kvm, 78) ||
866 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
867 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
868 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
869 break;
870 default:
871 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
872 }
873
874 while (start != end) {
875 unsigned long useraddr;
876
877 /* Translate guest address to host address */
878 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
879 if (kvm_is_error_hva(useraddr))
880 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
881
882 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
883 if (clear_user((void __user *)useraddr, PAGE_SIZE))
884 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
885 }
886
887 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
888 int rc = __skey_check_enable(vcpu);
889
890 if (rc)
891 return rc;
892 down_read(¤t->mm->mmap_sem);
893 rc = cond_set_guest_storage_key(current->mm, useraddr,
894 key, NULL, nq, mr, mc);
895 up_read(¤t->mm->mmap_sem);
896 if (rc < 0)
897 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
898 }
899
900 start += PAGE_SIZE;
901 }
902 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
903 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) {
904 vcpu->run->s.regs.gprs[reg2] = end;
905 } else {
906 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
907 end = kvm_s390_logical_to_effective(vcpu, end);
908 vcpu->run->s.regs.gprs[reg2] |= end;
909 }
910 }
911 return 0;
912}
913
914static int handle_essa(struct kvm_vcpu *vcpu)
915{
916 /* entries expected to be 1FF */
917 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
918 unsigned long *cbrlo;
919 struct gmap *gmap;
920 int i;
921
922 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
923 gmap = vcpu->arch.gmap;
924 vcpu->stat.instruction_essa++;
925 if (!vcpu->kvm->arch.use_cmma)
926 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
927
928 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
929 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
930
931 if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
932 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
933
934 /* Retry the ESSA instruction */
935 kvm_s390_retry_instr(vcpu);
936 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
937 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
938 down_read(&gmap->mm->mmap_sem);
939 for (i = 0; i < entries; ++i)
940 __gmap_zap(gmap, cbrlo[i]);
941 up_read(&gmap->mm->mmap_sem);
942 return 0;
943}
944
945static const intercept_handler_t b9_handlers[256] = {
946 [0x8a] = handle_ipte_interlock,
947 [0x8d] = handle_epsw,
948 [0x8e] = handle_ipte_interlock,
949 [0x8f] = handle_ipte_interlock,
950 [0xab] = handle_essa,
951 [0xaf] = handle_pfmf,
952};
953
954int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
955{
956 intercept_handler_t handler;
957
958 /* This is handled just as for the B2 instructions. */
959 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
960 if (handler)
961 return handler(vcpu);
962
963 return -EOPNOTSUPP;
964}
965
966int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
967{
968 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
969 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
970 int reg, rc, nr_regs;
971 u32 ctl_array[16];
972 u64 ga;
973 ar_t ar;
974
975 vcpu->stat.instruction_lctl++;
976
977 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
978 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
979
980 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
981
982 if (ga & 3)
983 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
984
985 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
986 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
987
988 nr_regs = ((reg3 - reg1) & 0xf) + 1;
989 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
990 if (rc)
991 return kvm_s390_inject_prog_cond(vcpu, rc);
992 reg = reg1;
993 nr_regs = 0;
994 do {
995 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
996 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
997 if (reg == reg3)
998 break;
999 reg = (reg + 1) % 16;
1000 } while (1);
1001 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1002 return 0;
1003}
1004
1005int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1006{
1007 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1008 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1009 int reg, rc, nr_regs;
1010 u32 ctl_array[16];
1011 u64 ga;
1012 ar_t ar;
1013
1014 vcpu->stat.instruction_stctl++;
1015
1016 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1017 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1018
1019 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1020
1021 if (ga & 3)
1022 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1023
1024 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1025 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1026
1027 reg = reg1;
1028 nr_regs = 0;
1029 do {
1030 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1031 if (reg == reg3)
1032 break;
1033 reg = (reg + 1) % 16;
1034 } while (1);
1035 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1036 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1037}
1038
1039static int handle_lctlg(struct kvm_vcpu *vcpu)
1040{
1041 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1042 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1043 int reg, rc, nr_regs;
1044 u64 ctl_array[16];
1045 u64 ga;
1046 ar_t ar;
1047
1048 vcpu->stat.instruction_lctlg++;
1049
1050 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1051 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1052
1053 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1054
1055 if (ga & 7)
1056 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1057
1058 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1059 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1060
1061 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1062 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1063 if (rc)
1064 return kvm_s390_inject_prog_cond(vcpu, rc);
1065 reg = reg1;
1066 nr_regs = 0;
1067 do {
1068 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1069 if (reg == reg3)
1070 break;
1071 reg = (reg + 1) % 16;
1072 } while (1);
1073 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1074 return 0;
1075}
1076
1077static int handle_stctg(struct kvm_vcpu *vcpu)
1078{
1079 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1080 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1081 int reg, rc, nr_regs;
1082 u64 ctl_array[16];
1083 u64 ga;
1084 ar_t ar;
1085
1086 vcpu->stat.instruction_stctg++;
1087
1088 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1089 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1090
1091 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1092
1093 if (ga & 7)
1094 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1095
1096 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1097 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1098
1099 reg = reg1;
1100 nr_regs = 0;
1101 do {
1102 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1103 if (reg == reg3)
1104 break;
1105 reg = (reg + 1) % 16;
1106 } while (1);
1107 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1108 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1109}
1110
1111static const intercept_handler_t eb_handlers[256] = {
1112 [0x2f] = handle_lctlg,
1113 [0x25] = handle_stctg,
1114 [0x60] = handle_ri,
1115 [0x61] = handle_ri,
1116 [0x62] = handle_ri,
1117};
1118
1119int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1120{
1121 intercept_handler_t handler;
1122
1123 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
1124 if (handler)
1125 return handler(vcpu);
1126 return -EOPNOTSUPP;
1127}
1128
1129static int handle_tprot(struct kvm_vcpu *vcpu)
1130{
1131 u64 address1, address2;
1132 unsigned long hva, gpa;
1133 int ret = 0, cc = 0;
1134 bool writable;
1135 ar_t ar;
1136
1137 vcpu->stat.instruction_tprot++;
1138
1139 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1140 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1141
1142 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1143
1144 /* we only handle the Linux memory detection case:
1145 * access key == 0
1146 * everything else goes to userspace. */
1147 if (address2 & 0xf0)
1148 return -EOPNOTSUPP;
1149 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1150 ipte_lock(vcpu);
1151 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1152 if (ret == PGM_PROTECTION) {
1153 /* Write protected? Try again with read-only... */
1154 cc = 1;
1155 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1156 GACC_FETCH);
1157 }
1158 if (ret) {
1159 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1160 ret = kvm_s390_inject_program_int(vcpu, ret);
1161 } else if (ret > 0) {
1162 /* Translation not available */
1163 kvm_s390_set_psw_cc(vcpu, 3);
1164 ret = 0;
1165 }
1166 goto out_unlock;
1167 }
1168
1169 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1170 if (kvm_is_error_hva(hva)) {
1171 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1172 } else {
1173 if (!writable)
1174 cc = 1; /* Write not permitted ==> read-only */
1175 kvm_s390_set_psw_cc(vcpu, cc);
1176 /* Note: CC2 only occurs for storage keys (not supported yet) */
1177 }
1178out_unlock:
1179 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1180 ipte_unlock(vcpu);
1181 return ret;
1182}
1183
1184int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1185{
1186 /* For e5xx... instructions we only handle TPROT */
1187 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1188 return handle_tprot(vcpu);
1189 return -EOPNOTSUPP;
1190}
1191
1192static int handle_sckpf(struct kvm_vcpu *vcpu)
1193{
1194 u32 value;
1195
1196 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1197 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1198
1199 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1200 return kvm_s390_inject_program_int(vcpu,
1201 PGM_SPECIFICATION);
1202
1203 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1204 vcpu->arch.sie_block->todpr = value;
1205
1206 return 0;
1207}
1208
1209static int handle_ptff(struct kvm_vcpu *vcpu)
1210{
1211 /* we don't emulate any control instructions yet */
1212 kvm_s390_set_psw_cc(vcpu, 3);
1213 return 0;
1214}
1215
1216static const intercept_handler_t x01_handlers[256] = {
1217 [0x04] = handle_ptff,
1218 [0x07] = handle_sckpf,
1219};
1220
1221int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1222{
1223 intercept_handler_t handler;
1224
1225 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1226 if (handler)
1227 return handler(vcpu);
1228 return -EOPNOTSUPP;
1229}