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