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/compat.h>
15 #include <linux/mm_types.h>
16 #include <linux/pgtable.h>
17
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/page-states.h>
25 #include <asm/gmap.h>
26 #include <asm/io.h>
27 #include <asm/ptrace.h>
28 #include <asm/sclp.h>
29 #include <asm/ap.h>
30 #include "gaccess.h"
31 #include "kvm-s390.h"
32 #include "trace.h"
33
handle_ri(struct kvm_vcpu * vcpu)34 static int handle_ri(struct kvm_vcpu *vcpu)
35 {
36 vcpu->stat.instruction_ri++;
37
38 if (test_kvm_facility(vcpu->kvm, 64)) {
39 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
40 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
41 kvm_s390_retry_instr(vcpu);
42 return 0;
43 } else
44 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
45 }
46
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)47 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
48 {
49 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
50 return handle_ri(vcpu);
51 else
52 return -EOPNOTSUPP;
53 }
54
handle_gs(struct kvm_vcpu * vcpu)55 static int handle_gs(struct kvm_vcpu *vcpu)
56 {
57 vcpu->stat.instruction_gs++;
58
59 if (test_kvm_facility(vcpu->kvm, 133)) {
60 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
61 preempt_disable();
62 __ctl_set_bit(2, 4);
63 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
64 restore_gs_cb(current->thread.gs_cb);
65 preempt_enable();
66 vcpu->arch.sie_block->ecb |= ECB_GS;
67 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
68 vcpu->arch.gs_enabled = 1;
69 kvm_s390_retry_instr(vcpu);
70 return 0;
71 } else
72 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
73 }
74
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)75 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
76 {
77 int code = vcpu->arch.sie_block->ipb & 0xff;
78
79 if (code == 0x49 || code == 0x4d)
80 return handle_gs(vcpu);
81 else
82 return -EOPNOTSUPP;
83 }
84 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)85 static int handle_set_clock(struct kvm_vcpu *vcpu)
86 {
87 struct kvm_s390_vm_tod_clock gtod = { 0 };
88 int rc;
89 u8 ar;
90 u64 op2;
91
92 vcpu->stat.instruction_sck++;
93
94 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
95 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
96
97 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
98 if (op2 & 7) /* Operand must be on a doubleword boundary */
99 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
100 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
101 if (rc)
102 return kvm_s390_inject_prog_cond(vcpu, rc);
103
104 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
105 /*
106 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
107 * is already held in handle_set_clock. The usual lock order is the
108 * opposite. As SCK is deprecated and should not be used in several
109 * cases, for example when the multiple epoch facility or TOD clock
110 * steering facility is installed (see Principles of Operation), a
111 * slow path can be used. If the lock can not be taken via try_lock,
112 * the instruction will be retried via -EAGAIN at a later point in
113 * time.
114 */
115 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
116 kvm_s390_retry_instr(vcpu);
117 return -EAGAIN;
118 }
119
120 kvm_s390_set_psw_cc(vcpu, 0);
121 return 0;
122 }
123
handle_set_prefix(struct kvm_vcpu * vcpu)124 static int handle_set_prefix(struct kvm_vcpu *vcpu)
125 {
126 u64 operand2;
127 u32 address;
128 int rc;
129 u8 ar;
130
131 vcpu->stat.instruction_spx++;
132
133 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
134 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
135
136 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
137
138 /* must be word boundary */
139 if (operand2 & 3)
140 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
141
142 /* get the value */
143 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
144 if (rc)
145 return kvm_s390_inject_prog_cond(vcpu, rc);
146
147 address &= 0x7fffe000u;
148
149 /*
150 * Make sure the new value is valid memory. We only need to check the
151 * first page, since address is 8k aligned and memory pieces are always
152 * at least 1MB aligned and have at least a size of 1MB.
153 */
154 if (kvm_is_error_gpa(vcpu->kvm, address))
155 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
156
157 kvm_s390_set_prefix(vcpu, address);
158 trace_kvm_s390_handle_prefix(vcpu, 1, address);
159 return 0;
160 }
161
handle_store_prefix(struct kvm_vcpu * vcpu)162 static int handle_store_prefix(struct kvm_vcpu *vcpu)
163 {
164 u64 operand2;
165 u32 address;
166 int rc;
167 u8 ar;
168
169 vcpu->stat.instruction_stpx++;
170
171 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
172 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
173
174 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
175
176 /* must be word boundary */
177 if (operand2 & 3)
178 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
179
180 address = kvm_s390_get_prefix(vcpu);
181
182 /* get the value */
183 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
184 if (rc)
185 return kvm_s390_inject_prog_cond(vcpu, rc);
186
187 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
188 trace_kvm_s390_handle_prefix(vcpu, 0, address);
189 return 0;
190 }
191
handle_store_cpu_address(struct kvm_vcpu * vcpu)192 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
193 {
194 u16 vcpu_id = vcpu->vcpu_id;
195 u64 ga;
196 int rc;
197 u8 ar;
198
199 vcpu->stat.instruction_stap++;
200
201 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
202 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
203
204 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
205
206 if (ga & 1)
207 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
208
209 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
210 if (rc)
211 return kvm_s390_inject_prog_cond(vcpu, rc);
212
213 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
214 trace_kvm_s390_handle_stap(vcpu, ga);
215 return 0;
216 }
217
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)218 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
219 {
220 int rc;
221
222 trace_kvm_s390_skey_related_inst(vcpu);
223 /* Already enabled? */
224 if (vcpu->arch.skey_enabled)
225 return 0;
226
227 rc = s390_enable_skey();
228 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
229 if (rc)
230 return rc;
231
232 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
233 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
234 if (!vcpu->kvm->arch.use_skf)
235 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
236 else
237 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
238 vcpu->arch.skey_enabled = true;
239 return 0;
240 }
241
try_handle_skey(struct kvm_vcpu * vcpu)242 static int try_handle_skey(struct kvm_vcpu *vcpu)
243 {
244 int rc;
245
246 rc = kvm_s390_skey_check_enable(vcpu);
247 if (rc)
248 return rc;
249 if (vcpu->kvm->arch.use_skf) {
250 /* with storage-key facility, SIE interprets it for us */
251 kvm_s390_retry_instr(vcpu);
252 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
253 return -EAGAIN;
254 }
255 return 0;
256 }
257
handle_iske(struct kvm_vcpu * vcpu)258 static int handle_iske(struct kvm_vcpu *vcpu)
259 {
260 unsigned long gaddr, vmaddr;
261 unsigned char key;
262 int reg1, reg2;
263 bool unlocked;
264 int rc;
265
266 vcpu->stat.instruction_iske++;
267
268 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
269 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
270
271 rc = try_handle_skey(vcpu);
272 if (rc)
273 return rc != -EAGAIN ? rc : 0;
274
275 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
276
277 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
278 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
279 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
280 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
281 if (kvm_is_error_hva(vmaddr))
282 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
283 retry:
284 unlocked = false;
285 mmap_read_lock(current->mm);
286 rc = get_guest_storage_key(current->mm, vmaddr, &key);
287
288 if (rc) {
289 rc = fixup_user_fault(current->mm, vmaddr,
290 FAULT_FLAG_WRITE, &unlocked);
291 if (!rc) {
292 mmap_read_unlock(current->mm);
293 goto retry;
294 }
295 }
296 mmap_read_unlock(current->mm);
297 if (rc == -EFAULT)
298 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
299 if (rc < 0)
300 return rc;
301 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
302 vcpu->run->s.regs.gprs[reg1] |= key;
303 return 0;
304 }
305
handle_rrbe(struct kvm_vcpu * vcpu)306 static int handle_rrbe(struct kvm_vcpu *vcpu)
307 {
308 unsigned long vmaddr, gaddr;
309 int reg1, reg2;
310 bool unlocked;
311 int rc;
312
313 vcpu->stat.instruction_rrbe++;
314
315 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
316 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
317
318 rc = try_handle_skey(vcpu);
319 if (rc)
320 return rc != -EAGAIN ? rc : 0;
321
322 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
323
324 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
325 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
326 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
327 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
328 if (kvm_is_error_hva(vmaddr))
329 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
330 retry:
331 unlocked = false;
332 mmap_read_lock(current->mm);
333 rc = reset_guest_reference_bit(current->mm, vmaddr);
334 if (rc < 0) {
335 rc = fixup_user_fault(current->mm, vmaddr,
336 FAULT_FLAG_WRITE, &unlocked);
337 if (!rc) {
338 mmap_read_unlock(current->mm);
339 goto retry;
340 }
341 }
342 mmap_read_unlock(current->mm);
343 if (rc == -EFAULT)
344 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
345 if (rc < 0)
346 return rc;
347 kvm_s390_set_psw_cc(vcpu, rc);
348 return 0;
349 }
350
351 #define SSKE_NQ 0x8
352 #define SSKE_MR 0x4
353 #define SSKE_MC 0x2
354 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)355 static int handle_sske(struct kvm_vcpu *vcpu)
356 {
357 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
358 unsigned long start, end;
359 unsigned char key, oldkey;
360 int reg1, reg2;
361 bool unlocked;
362 int rc;
363
364 vcpu->stat.instruction_sske++;
365
366 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
367 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
368
369 rc = try_handle_skey(vcpu);
370 if (rc)
371 return rc != -EAGAIN ? rc : 0;
372
373 if (!test_kvm_facility(vcpu->kvm, 8))
374 m3 &= ~SSKE_MB;
375 if (!test_kvm_facility(vcpu->kvm, 10))
376 m3 &= ~(SSKE_MC | SSKE_MR);
377 if (!test_kvm_facility(vcpu->kvm, 14))
378 m3 &= ~SSKE_NQ;
379
380 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
381
382 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
383 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
384 start = kvm_s390_logical_to_effective(vcpu, start);
385 if (m3 & SSKE_MB) {
386 /* start already designates an absolute address */
387 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
388 } else {
389 start = kvm_s390_real_to_abs(vcpu, start);
390 end = start + PAGE_SIZE;
391 }
392
393 while (start != end) {
394 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
395 unlocked = false;
396
397 if (kvm_is_error_hva(vmaddr))
398 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
399
400 mmap_read_lock(current->mm);
401 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
402 m3 & SSKE_NQ, m3 & SSKE_MR,
403 m3 & SSKE_MC);
404
405 if (rc < 0) {
406 rc = fixup_user_fault(current->mm, vmaddr,
407 FAULT_FLAG_WRITE, &unlocked);
408 rc = !rc ? -EAGAIN : rc;
409 }
410 mmap_read_unlock(current->mm);
411 if (rc == -EFAULT)
412 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
413 if (rc == -EAGAIN)
414 continue;
415 if (rc < 0)
416 return rc;
417 start += PAGE_SIZE;
418 }
419
420 if (m3 & (SSKE_MC | SSKE_MR)) {
421 if (m3 & SSKE_MB) {
422 /* skey in reg1 is unpredictable */
423 kvm_s390_set_psw_cc(vcpu, 3);
424 } else {
425 kvm_s390_set_psw_cc(vcpu, rc);
426 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
427 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
428 }
429 }
430 if (m3 & SSKE_MB) {
431 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
432 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
433 else
434 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
435 end = kvm_s390_logical_to_effective(vcpu, end);
436 vcpu->run->s.regs.gprs[reg2] |= end;
437 }
438 return 0;
439 }
440
handle_ipte_interlock(struct kvm_vcpu * vcpu)441 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
442 {
443 vcpu->stat.instruction_ipte_interlock++;
444 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
445 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
446 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
447 kvm_s390_retry_instr(vcpu);
448 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
449 return 0;
450 }
451
handle_test_block(struct kvm_vcpu * vcpu)452 static int handle_test_block(struct kvm_vcpu *vcpu)
453 {
454 gpa_t addr;
455 int reg2;
456
457 vcpu->stat.instruction_tb++;
458
459 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
460 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
461
462 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
463 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
464 addr = kvm_s390_logical_to_effective(vcpu, addr);
465 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
466 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
467 addr = kvm_s390_real_to_abs(vcpu, addr);
468
469 if (kvm_is_error_gpa(vcpu->kvm, addr))
470 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
471 /*
472 * We don't expect errors on modern systems, and do not care
473 * about storage keys (yet), so let's just clear the page.
474 */
475 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
476 return -EFAULT;
477 kvm_s390_set_psw_cc(vcpu, 0);
478 vcpu->run->s.regs.gprs[0] = 0;
479 return 0;
480 }
481
handle_tpi(struct kvm_vcpu * vcpu)482 static int handle_tpi(struct kvm_vcpu *vcpu)
483 {
484 struct kvm_s390_interrupt_info *inti;
485 unsigned long len;
486 u32 tpi_data[3];
487 int rc;
488 u64 addr;
489 u8 ar;
490
491 vcpu->stat.instruction_tpi++;
492
493 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
494 if (addr & 3)
495 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
496
497 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
498 if (!inti) {
499 kvm_s390_set_psw_cc(vcpu, 0);
500 return 0;
501 }
502
503 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
504 tpi_data[1] = inti->io.io_int_parm;
505 tpi_data[2] = inti->io.io_int_word;
506 if (addr) {
507 /*
508 * Store the two-word I/O interruption code into the
509 * provided area.
510 */
511 len = sizeof(tpi_data) - 4;
512 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
513 if (rc) {
514 rc = kvm_s390_inject_prog_cond(vcpu, rc);
515 goto reinject_interrupt;
516 }
517 } else {
518 /*
519 * Store the three-word I/O interruption code into
520 * the appropriate lowcore area.
521 */
522 len = sizeof(tpi_data);
523 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
524 /* failed writes to the low core are not recoverable */
525 rc = -EFAULT;
526 goto reinject_interrupt;
527 }
528 }
529
530 /* irq was successfully handed to the guest */
531 kfree(inti);
532 kvm_s390_set_psw_cc(vcpu, 1);
533 return 0;
534 reinject_interrupt:
535 /*
536 * If we encounter a problem storing the interruption code, the
537 * instruction is suppressed from the guest's view: reinject the
538 * interrupt.
539 */
540 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
541 kfree(inti);
542 rc = -EFAULT;
543 }
544 /* don't set the cc, a pgm irq was injected or we drop to user space */
545 return rc ? -EFAULT : 0;
546 }
547
handle_tsch(struct kvm_vcpu * vcpu)548 static int handle_tsch(struct kvm_vcpu *vcpu)
549 {
550 struct kvm_s390_interrupt_info *inti = NULL;
551 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
552
553 vcpu->stat.instruction_tsch++;
554
555 /* a valid schid has at least one bit set */
556 if (vcpu->run->s.regs.gprs[1])
557 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
558 vcpu->run->s.regs.gprs[1]);
559
560 /*
561 * Prepare exit to userspace.
562 * We indicate whether we dequeued a pending I/O interrupt
563 * so that userspace can re-inject it if the instruction gets
564 * a program check. While this may re-order the pending I/O
565 * interrupts, this is no problem since the priority is kept
566 * intact.
567 */
568 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
569 vcpu->run->s390_tsch.dequeued = !!inti;
570 if (inti) {
571 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
572 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
573 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
574 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
575 }
576 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
577 kfree(inti);
578 return -EREMOTE;
579 }
580
handle_io_inst(struct kvm_vcpu * vcpu)581 static int handle_io_inst(struct kvm_vcpu *vcpu)
582 {
583 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
584
585 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
586 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
587
588 if (vcpu->kvm->arch.css_support) {
589 /*
590 * Most I/O instructions will be handled by userspace.
591 * Exceptions are tpi and the interrupt portion of tsch.
592 */
593 if (vcpu->arch.sie_block->ipa == 0xb236)
594 return handle_tpi(vcpu);
595 if (vcpu->arch.sie_block->ipa == 0xb235)
596 return handle_tsch(vcpu);
597 /* Handle in userspace. */
598 vcpu->stat.instruction_io_other++;
599 return -EOPNOTSUPP;
600 } else {
601 /*
602 * Set condition code 3 to stop the guest from issuing channel
603 * I/O instructions.
604 */
605 kvm_s390_set_psw_cc(vcpu, 3);
606 return 0;
607 }
608 }
609
610 /*
611 * handle_pqap: Handling pqap interception
612 * @vcpu: the vcpu having issue the pqap instruction
613 *
614 * We now support PQAP/AQIC instructions and we need to correctly
615 * answer the guest even if no dedicated driver's hook is available.
616 *
617 * The intercepting code calls a dedicated callback for this instruction
618 * if a driver did register one in the CRYPTO satellite of the
619 * SIE block.
620 *
621 * If no callback is available, the queues are not available, return this
622 * response code to the caller and set CC to 3.
623 * Else return the response code returned by the callback.
624 */
handle_pqap(struct kvm_vcpu * vcpu)625 static int handle_pqap(struct kvm_vcpu *vcpu)
626 {
627 struct ap_queue_status status = {};
628 crypto_hook pqap_hook;
629 unsigned long reg0;
630 int ret;
631 uint8_t fc;
632
633 /* Verify that the AP instruction are available */
634 if (!ap_instructions_available())
635 return -EOPNOTSUPP;
636 /* Verify that the guest is allowed to use AP instructions */
637 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
638 return -EOPNOTSUPP;
639 /*
640 * The only possibly intercepted functions when AP instructions are
641 * available for the guest are AQIC and TAPQ with the t bit set
642 * since we do not set IC.3 (FIII) we currently will only intercept
643 * the AQIC function code.
644 * Note: running nested under z/VM can result in intercepts for other
645 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
646 */
647 reg0 = vcpu->run->s.regs.gprs[0];
648 fc = (reg0 >> 24) & 0xff;
649 if (fc != 0x03)
650 return -EOPNOTSUPP;
651
652 /* PQAP instruction is allowed for guest kernel only */
653 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
654 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
655
656 /* Common PQAP instruction specification exceptions */
657 /* bits 41-47 must all be zeros */
658 if (reg0 & 0x007f0000UL)
659 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
660 /* APFT not install and T bit set */
661 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
662 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
663 /* APXA not installed and APID greater 64 or APQI greater 16 */
664 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
665 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
666
667 /* AQIC function code specific exception */
668 /* facility 65 not present for AQIC function code */
669 if (!test_kvm_facility(vcpu->kvm, 65))
670 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
671
672 /*
673 * If the hook callback is registered, there will be a pointer to the
674 * hook function pointer in the kvm_s390_crypto structure. Lock the
675 * owner, retrieve the hook function pointer and call the hook.
676 */
677 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
678 if (vcpu->kvm->arch.crypto.pqap_hook) {
679 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
680 ret = pqap_hook(vcpu);
681 if (!ret && vcpu->run->s.regs.gprs[1] & 0x00ff0000)
682 kvm_s390_set_psw_cc(vcpu, 3);
683 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
684 return ret;
685 }
686 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
687 /*
688 * A vfio_driver must register a hook.
689 * No hook means no driver to enable the SIE CRYCB and no queues.
690 * We send this response to the guest.
691 */
692 status.response_code = 0x01;
693 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
694 kvm_s390_set_psw_cc(vcpu, 3);
695 return 0;
696 }
697
handle_stfl(struct kvm_vcpu * vcpu)698 static int handle_stfl(struct kvm_vcpu *vcpu)
699 {
700 int rc;
701 unsigned int fac;
702
703 vcpu->stat.instruction_stfl++;
704
705 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
706 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
707
708 /*
709 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
710 * into a u32 memory representation. They will remain bits 0-31.
711 */
712 fac = *vcpu->kvm->arch.model.fac_list >> 32;
713 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
714 &fac, sizeof(fac));
715 if (rc)
716 return rc;
717 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
718 trace_kvm_s390_handle_stfl(vcpu, fac);
719 return 0;
720 }
721
722 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
723 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
724 #define PSW_ADDR_24 0x0000000000ffffffUL
725 #define PSW_ADDR_31 0x000000007fffffffUL
726
is_valid_psw(psw_t * psw)727 int is_valid_psw(psw_t *psw)
728 {
729 if (psw->mask & PSW_MASK_UNASSIGNED)
730 return 0;
731 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
732 if (psw->addr & ~PSW_ADDR_31)
733 return 0;
734 }
735 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
736 return 0;
737 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
738 return 0;
739 if (psw->addr & 1)
740 return 0;
741 return 1;
742 }
743
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)744 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
745 {
746 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
747 psw_compat_t new_psw;
748 u64 addr;
749 int rc;
750 u8 ar;
751
752 vcpu->stat.instruction_lpsw++;
753
754 if (gpsw->mask & PSW_MASK_PSTATE)
755 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
756
757 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
758 if (addr & 7)
759 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
760
761 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
762 if (rc)
763 return kvm_s390_inject_prog_cond(vcpu, rc);
764 if (!(new_psw.mask & PSW32_MASK_BASE))
765 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
766 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
767 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
768 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
769 if (!is_valid_psw(gpsw))
770 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
771 return 0;
772 }
773
handle_lpswe(struct kvm_vcpu * vcpu)774 static int handle_lpswe(struct kvm_vcpu *vcpu)
775 {
776 psw_t new_psw;
777 u64 addr;
778 int rc;
779 u8 ar;
780
781 vcpu->stat.instruction_lpswe++;
782
783 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
784 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
785
786 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
787 if (addr & 7)
788 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
789 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
790 if (rc)
791 return kvm_s390_inject_prog_cond(vcpu, rc);
792 vcpu->arch.sie_block->gpsw = new_psw;
793 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
794 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
795 return 0;
796 }
797
handle_stidp(struct kvm_vcpu * vcpu)798 static int handle_stidp(struct kvm_vcpu *vcpu)
799 {
800 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
801 u64 operand2;
802 int rc;
803 u8 ar;
804
805 vcpu->stat.instruction_stidp++;
806
807 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
808 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
809
810 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
811
812 if (operand2 & 7)
813 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
814
815 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
816 if (rc)
817 return kvm_s390_inject_prog_cond(vcpu, rc);
818
819 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
820 return 0;
821 }
822
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)823 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
824 {
825 int cpus = 0;
826 int n;
827
828 cpus = atomic_read(&vcpu->kvm->online_vcpus);
829
830 /* deal with other level 3 hypervisors */
831 if (stsi(mem, 3, 2, 2))
832 mem->count = 0;
833 if (mem->count < 8)
834 mem->count++;
835 for (n = mem->count - 1; n > 0 ; n--)
836 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
837
838 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
839 mem->vm[0].cpus_total = cpus;
840 mem->vm[0].cpus_configured = cpus;
841 mem->vm[0].cpus_standby = 0;
842 mem->vm[0].cpus_reserved = 0;
843 mem->vm[0].caf = 1000;
844 memcpy(mem->vm[0].name, "KVMguest", 8);
845 ASCEBC(mem->vm[0].name, 8);
846 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
847 ASCEBC(mem->vm[0].cpi, 16);
848 }
849
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)850 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
851 u8 fc, u8 sel1, u16 sel2)
852 {
853 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
854 vcpu->run->s390_stsi.addr = addr;
855 vcpu->run->s390_stsi.ar = ar;
856 vcpu->run->s390_stsi.fc = fc;
857 vcpu->run->s390_stsi.sel1 = sel1;
858 vcpu->run->s390_stsi.sel2 = sel2;
859 }
860
handle_stsi(struct kvm_vcpu * vcpu)861 static int handle_stsi(struct kvm_vcpu *vcpu)
862 {
863 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
864 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
865 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
866 unsigned long mem = 0;
867 u64 operand2;
868 int rc = 0;
869 u8 ar;
870
871 vcpu->stat.instruction_stsi++;
872 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
873
874 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
875 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
876
877 if (fc > 3) {
878 kvm_s390_set_psw_cc(vcpu, 3);
879 return 0;
880 }
881
882 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
883 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
884 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
885
886 if (fc == 0) {
887 vcpu->run->s.regs.gprs[0] = 3 << 28;
888 kvm_s390_set_psw_cc(vcpu, 0);
889 return 0;
890 }
891
892 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
893
894 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
895 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
896
897 switch (fc) {
898 case 1: /* same handling for 1 and 2 */
899 case 2:
900 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
901 if (!mem)
902 goto out_no_data;
903 if (stsi((void *) mem, fc, sel1, sel2))
904 goto out_no_data;
905 break;
906 case 3:
907 if (sel1 != 2 || sel2 != 2)
908 goto out_no_data;
909 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
910 if (!mem)
911 goto out_no_data;
912 handle_stsi_3_2_2(vcpu, (void *) mem);
913 break;
914 }
915 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
916 memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem,
917 PAGE_SIZE);
918 rc = 0;
919 } else {
920 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
921 }
922 if (rc) {
923 rc = kvm_s390_inject_prog_cond(vcpu, rc);
924 goto out;
925 }
926 if (vcpu->kvm->arch.user_stsi) {
927 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
928 rc = -EREMOTE;
929 }
930 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
931 free_page(mem);
932 kvm_s390_set_psw_cc(vcpu, 0);
933 vcpu->run->s.regs.gprs[0] = 0;
934 return rc;
935 out_no_data:
936 kvm_s390_set_psw_cc(vcpu, 3);
937 out:
938 free_page(mem);
939 return rc;
940 }
941
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)942 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
943 {
944 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
945 case 0x02:
946 return handle_stidp(vcpu);
947 case 0x04:
948 return handle_set_clock(vcpu);
949 case 0x10:
950 return handle_set_prefix(vcpu);
951 case 0x11:
952 return handle_store_prefix(vcpu);
953 case 0x12:
954 return handle_store_cpu_address(vcpu);
955 case 0x14:
956 return kvm_s390_handle_vsie(vcpu);
957 case 0x21:
958 case 0x50:
959 return handle_ipte_interlock(vcpu);
960 case 0x29:
961 return handle_iske(vcpu);
962 case 0x2a:
963 return handle_rrbe(vcpu);
964 case 0x2b:
965 return handle_sske(vcpu);
966 case 0x2c:
967 return handle_test_block(vcpu);
968 case 0x30:
969 case 0x31:
970 case 0x32:
971 case 0x33:
972 case 0x34:
973 case 0x35:
974 case 0x36:
975 case 0x37:
976 case 0x38:
977 case 0x39:
978 case 0x3a:
979 case 0x3b:
980 case 0x3c:
981 case 0x5f:
982 case 0x74:
983 case 0x76:
984 return handle_io_inst(vcpu);
985 case 0x56:
986 return handle_sthyi(vcpu);
987 case 0x7d:
988 return handle_stsi(vcpu);
989 case 0xaf:
990 return handle_pqap(vcpu);
991 case 0xb1:
992 return handle_stfl(vcpu);
993 case 0xb2:
994 return handle_lpswe(vcpu);
995 default:
996 return -EOPNOTSUPP;
997 }
998 }
999
handle_epsw(struct kvm_vcpu * vcpu)1000 static int handle_epsw(struct kvm_vcpu *vcpu)
1001 {
1002 int reg1, reg2;
1003
1004 vcpu->stat.instruction_epsw++;
1005
1006 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1007
1008 /* This basically extracts the mask half of the psw. */
1009 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1010 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1011 if (reg2) {
1012 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1013 vcpu->run->s.regs.gprs[reg2] |=
1014 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1015 }
1016 return 0;
1017 }
1018
1019 #define PFMF_RESERVED 0xfffc0101UL
1020 #define PFMF_SK 0x00020000UL
1021 #define PFMF_CF 0x00010000UL
1022 #define PFMF_UI 0x00008000UL
1023 #define PFMF_FSC 0x00007000UL
1024 #define PFMF_NQ 0x00000800UL
1025 #define PFMF_MR 0x00000400UL
1026 #define PFMF_MC 0x00000200UL
1027 #define PFMF_KEY 0x000000feUL
1028
handle_pfmf(struct kvm_vcpu * vcpu)1029 static int handle_pfmf(struct kvm_vcpu *vcpu)
1030 {
1031 bool mr = false, mc = false, nq;
1032 int reg1, reg2;
1033 unsigned long start, end;
1034 unsigned char key;
1035
1036 vcpu->stat.instruction_pfmf++;
1037
1038 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1039
1040 if (!test_kvm_facility(vcpu->kvm, 8))
1041 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1042
1043 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1044 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1045
1046 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1047 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1048
1049 /* Only provide non-quiescing support if enabled for the guest */
1050 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1051 !test_kvm_facility(vcpu->kvm, 14))
1052 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1053
1054 /* Only provide conditional-SSKE support if enabled for the guest */
1055 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1056 test_kvm_facility(vcpu->kvm, 10)) {
1057 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1058 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1059 }
1060
1061 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1062 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1063 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1064 start = kvm_s390_logical_to_effective(vcpu, start);
1065
1066 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1067 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1068 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1069 }
1070
1071 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1072 case 0x00000000:
1073 /* only 4k frames specify a real address */
1074 start = kvm_s390_real_to_abs(vcpu, start);
1075 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1076 break;
1077 case 0x00001000:
1078 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1079 break;
1080 case 0x00002000:
1081 /* only support 2G frame size if EDAT2 is available and we are
1082 not in 24-bit addressing mode */
1083 if (!test_kvm_facility(vcpu->kvm, 78) ||
1084 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1085 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1086 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1087 break;
1088 default:
1089 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1090 }
1091
1092 while (start != end) {
1093 unsigned long vmaddr;
1094 bool unlocked = false;
1095
1096 /* Translate guest address to host address */
1097 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1098 if (kvm_is_error_hva(vmaddr))
1099 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1100
1101 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1102 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1103 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1104 }
1105
1106 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1107 int rc = kvm_s390_skey_check_enable(vcpu);
1108
1109 if (rc)
1110 return rc;
1111 mmap_read_lock(current->mm);
1112 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1113 key, NULL, nq, mr, mc);
1114 if (rc < 0) {
1115 rc = fixup_user_fault(current->mm, vmaddr,
1116 FAULT_FLAG_WRITE, &unlocked);
1117 rc = !rc ? -EAGAIN : rc;
1118 }
1119 mmap_read_unlock(current->mm);
1120 if (rc == -EFAULT)
1121 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1122 if (rc == -EAGAIN)
1123 continue;
1124 if (rc < 0)
1125 return rc;
1126 }
1127 start += PAGE_SIZE;
1128 }
1129 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1130 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1131 vcpu->run->s.regs.gprs[reg2] = end;
1132 } else {
1133 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1134 end = kvm_s390_logical_to_effective(vcpu, end);
1135 vcpu->run->s.regs.gprs[reg2] |= end;
1136 }
1137 }
1138 return 0;
1139 }
1140
1141 /*
1142 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1143 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1144 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1145 {
1146 int r1, r2, nappended, entries;
1147 unsigned long gfn, hva, res, pgstev, ptev;
1148 unsigned long *cbrlo;
1149
1150 /*
1151 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1152 * machine check here we either handle it or crash
1153 */
1154
1155 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1156 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1157 hva = gfn_to_hva(vcpu->kvm, gfn);
1158 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1159
1160 if (kvm_is_error_hva(hva))
1161 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1162
1163 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1164 if (nappended < 0) {
1165 res = orc ? 0x10 : 0;
1166 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1167 return 0;
1168 }
1169 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1170 /*
1171 * Set the block-content state part of the result. 0 means resident, so
1172 * nothing to do if the page is valid. 2 is for preserved pages
1173 * (non-present and non-zero), and 3 for zero pages (non-present and
1174 * zero).
1175 */
1176 if (ptev & _PAGE_INVALID) {
1177 res |= 2;
1178 if (pgstev & _PGSTE_GPS_ZERO)
1179 res |= 1;
1180 }
1181 if (pgstev & _PGSTE_GPS_NODAT)
1182 res |= 0x20;
1183 vcpu->run->s.regs.gprs[r1] = res;
1184 /*
1185 * It is possible that all the normal 511 slots were full, in which case
1186 * we will now write in the 512th slot, which is reserved for host use.
1187 * In both cases we let the normal essa handling code process all the
1188 * slots, including the reserved one, if needed.
1189 */
1190 if (nappended > 0) {
1191 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1192 cbrlo[entries] = gfn << PAGE_SHIFT;
1193 }
1194
1195 if (orc) {
1196 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1197
1198 /* Increment only if we are really flipping the bit */
1199 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1200 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1201 }
1202
1203 return nappended;
1204 }
1205
handle_essa(struct kvm_vcpu * vcpu)1206 static int handle_essa(struct kvm_vcpu *vcpu)
1207 {
1208 /* entries expected to be 1FF */
1209 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1210 unsigned long *cbrlo;
1211 struct gmap *gmap;
1212 int i, orc;
1213
1214 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1215 gmap = vcpu->arch.gmap;
1216 vcpu->stat.instruction_essa++;
1217 if (!vcpu->kvm->arch.use_cmma)
1218 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1219
1220 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1221 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1222 /* Check for invalid operation request code */
1223 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1224 /* ORCs 0-6 are always valid */
1225 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1226 : ESSA_SET_STABLE_IF_RESIDENT))
1227 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1228
1229 if (!vcpu->kvm->arch.migration_mode) {
1230 /*
1231 * CMMA is enabled in the KVM settings, but is disabled in
1232 * the SIE block and in the mm_context, and we are not doing
1233 * a migration. Enable CMMA in the mm_context.
1234 * Since we need to take a write lock to write to the context
1235 * to avoid races with storage keys handling, we check if the
1236 * value really needs to be written to; if the value is
1237 * already correct, we do nothing and avoid the lock.
1238 */
1239 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1240 mmap_write_lock(vcpu->kvm->mm);
1241 vcpu->kvm->mm->context.uses_cmm = 1;
1242 mmap_write_unlock(vcpu->kvm->mm);
1243 }
1244 /*
1245 * If we are here, we are supposed to have CMMA enabled in
1246 * the SIE block. Enabling CMMA works on a per-CPU basis,
1247 * while the context use_cmma flag is per process.
1248 * It's possible that the context flag is enabled and the
1249 * SIE flag is not, so we set the flag always; if it was
1250 * already set, nothing changes, otherwise we enable it
1251 * on this CPU too.
1252 */
1253 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1254 /* Retry the ESSA instruction */
1255 kvm_s390_retry_instr(vcpu);
1256 } else {
1257 int srcu_idx;
1258
1259 mmap_read_lock(vcpu->kvm->mm);
1260 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1261 i = __do_essa(vcpu, orc);
1262 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1263 mmap_read_unlock(vcpu->kvm->mm);
1264 if (i < 0)
1265 return i;
1266 /* Account for the possible extra cbrl entry */
1267 entries += i;
1268 }
1269 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1270 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1271 mmap_read_lock(gmap->mm);
1272 for (i = 0; i < entries; ++i)
1273 __gmap_zap(gmap, cbrlo[i]);
1274 mmap_read_unlock(gmap->mm);
1275 return 0;
1276 }
1277
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1278 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1279 {
1280 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1281 case 0x8a:
1282 case 0x8e:
1283 case 0x8f:
1284 return handle_ipte_interlock(vcpu);
1285 case 0x8d:
1286 return handle_epsw(vcpu);
1287 case 0xab:
1288 return handle_essa(vcpu);
1289 case 0xaf:
1290 return handle_pfmf(vcpu);
1291 default:
1292 return -EOPNOTSUPP;
1293 }
1294 }
1295
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1296 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1297 {
1298 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1299 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1300 int reg, rc, nr_regs;
1301 u32 ctl_array[16];
1302 u64 ga;
1303 u8 ar;
1304
1305 vcpu->stat.instruction_lctl++;
1306
1307 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1308 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1309
1310 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1311
1312 if (ga & 3)
1313 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1314
1315 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1316 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1317
1318 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1319 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1320 if (rc)
1321 return kvm_s390_inject_prog_cond(vcpu, rc);
1322 reg = reg1;
1323 nr_regs = 0;
1324 do {
1325 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1326 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1327 if (reg == reg3)
1328 break;
1329 reg = (reg + 1) % 16;
1330 } while (1);
1331 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1332 return 0;
1333 }
1334
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1335 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1336 {
1337 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1338 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1339 int reg, rc, nr_regs;
1340 u32 ctl_array[16];
1341 u64 ga;
1342 u8 ar;
1343
1344 vcpu->stat.instruction_stctl++;
1345
1346 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1347 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1348
1349 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1350
1351 if (ga & 3)
1352 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1353
1354 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1355 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1356
1357 reg = reg1;
1358 nr_regs = 0;
1359 do {
1360 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1361 if (reg == reg3)
1362 break;
1363 reg = (reg + 1) % 16;
1364 } while (1);
1365 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1366 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1367 }
1368
handle_lctlg(struct kvm_vcpu * vcpu)1369 static int handle_lctlg(struct kvm_vcpu *vcpu)
1370 {
1371 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1372 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1373 int reg, rc, nr_regs;
1374 u64 ctl_array[16];
1375 u64 ga;
1376 u8 ar;
1377
1378 vcpu->stat.instruction_lctlg++;
1379
1380 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1381 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1382
1383 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1384
1385 if (ga & 7)
1386 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1387
1388 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1389 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1390
1391 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1392 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1393 if (rc)
1394 return kvm_s390_inject_prog_cond(vcpu, rc);
1395 reg = reg1;
1396 nr_regs = 0;
1397 do {
1398 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1399 if (reg == reg3)
1400 break;
1401 reg = (reg + 1) % 16;
1402 } while (1);
1403 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1404 return 0;
1405 }
1406
handle_stctg(struct kvm_vcpu * vcpu)1407 static int handle_stctg(struct kvm_vcpu *vcpu)
1408 {
1409 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1410 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1411 int reg, rc, nr_regs;
1412 u64 ctl_array[16];
1413 u64 ga;
1414 u8 ar;
1415
1416 vcpu->stat.instruction_stctg++;
1417
1418 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1419 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1420
1421 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1422
1423 if (ga & 7)
1424 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1425
1426 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1427 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1428
1429 reg = reg1;
1430 nr_regs = 0;
1431 do {
1432 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1433 if (reg == reg3)
1434 break;
1435 reg = (reg + 1) % 16;
1436 } while (1);
1437 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1438 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1439 }
1440
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1441 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1442 {
1443 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1444 case 0x25:
1445 return handle_stctg(vcpu);
1446 case 0x2f:
1447 return handle_lctlg(vcpu);
1448 case 0x60:
1449 case 0x61:
1450 case 0x62:
1451 return handle_ri(vcpu);
1452 default:
1453 return -EOPNOTSUPP;
1454 }
1455 }
1456
handle_tprot(struct kvm_vcpu * vcpu)1457 static int handle_tprot(struct kvm_vcpu *vcpu)
1458 {
1459 u64 address1, address2;
1460 unsigned long hva, gpa;
1461 int ret = 0, cc = 0;
1462 bool writable;
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, &address1, &address2, &ar, NULL);
1471
1472 /* we only handle the Linux memory detection case:
1473 * access key == 0
1474 * everything else goes to userspace. */
1475 if (address2 & 0xf0)
1476 return -EOPNOTSUPP;
1477 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1478 ipte_lock(vcpu);
1479 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1480 if (ret == PGM_PROTECTION) {
1481 /* Write protected? Try again with read-only... */
1482 cc = 1;
1483 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1484 GACC_FETCH);
1485 }
1486 if (ret) {
1487 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1488 ret = kvm_s390_inject_program_int(vcpu, ret);
1489 } else if (ret > 0) {
1490 /* Translation not available */
1491 kvm_s390_set_psw_cc(vcpu, 3);
1492 ret = 0;
1493 }
1494 goto out_unlock;
1495 }
1496
1497 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1498 if (kvm_is_error_hva(hva)) {
1499 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1500 } else {
1501 if (!writable)
1502 cc = 1; /* Write not permitted ==> read-only */
1503 kvm_s390_set_psw_cc(vcpu, cc);
1504 /* Note: CC2 only occurs for storage keys (not supported yet) */
1505 }
1506 out_unlock:
1507 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1508 ipte_unlock(vcpu);
1509 return ret;
1510 }
1511
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1512 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1513 {
1514 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1515 case 0x01:
1516 return handle_tprot(vcpu);
1517 default:
1518 return -EOPNOTSUPP;
1519 }
1520 }
1521
handle_sckpf(struct kvm_vcpu * vcpu)1522 static int handle_sckpf(struct kvm_vcpu *vcpu)
1523 {
1524 u32 value;
1525
1526 vcpu->stat.instruction_sckpf++;
1527
1528 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1529 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1530
1531 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1532 return kvm_s390_inject_program_int(vcpu,
1533 PGM_SPECIFICATION);
1534
1535 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1536 vcpu->arch.sie_block->todpr = value;
1537
1538 return 0;
1539 }
1540
handle_ptff(struct kvm_vcpu * vcpu)1541 static int handle_ptff(struct kvm_vcpu *vcpu)
1542 {
1543 vcpu->stat.instruction_ptff++;
1544
1545 /* we don't emulate any control instructions yet */
1546 kvm_s390_set_psw_cc(vcpu, 3);
1547 return 0;
1548 }
1549
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1550 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1551 {
1552 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1553 case 0x04:
1554 return handle_ptff(vcpu);
1555 case 0x07:
1556 return handle_sckpf(vcpu);
1557 default:
1558 return -EOPNOTSUPP;
1559 }
1560 }
1561