?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mm/hmm.c: remove superfluous RCU protection around radix tree lookup
[linux/fpc-iii.git] / arch / s390 / kvm / priv.c
blobebfa0442e569af65fae1a46a4736024555721b80
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling privileged instructions
4 *
5 * Copyright IBM Corp. 2008, 2018
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
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/pgtable.h>
24 #include <asm/page-states.h>
25 #include <asm/pgalloc.h>
26 #include <asm/gmap.h>
27 #include <asm/io.h>
28 #include <asm/ptrace.h>
29 #include <asm/compat.h>
30 #include <asm/sclp.h>
31 #include "gaccess.h"
32 #include "kvm-s390.h"
33 #include "trace.h"
34
35 static int handle_ri(struct kvm_vcpu *vcpu)
36 {
37 vcpu->stat.instruction_ri++;
38
39 if (test_kvm_facility(vcpu->kvm, 64)) {
40 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
41 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
42 kvm_s390_retry_instr(vcpu);
43 return 0;
44 } else
45 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
46 }
47
48 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
49 {
50 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
51 return handle_ri(vcpu);
52 else
53 return -EOPNOTSUPP;
54 }
55
56 static int handle_gs(struct kvm_vcpu *vcpu)
57 {
58 vcpu->stat.instruction_gs++;
59
60 if (test_kvm_facility(vcpu->kvm, 133)) {
61 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
62 preempt_disable();
63 __ctl_set_bit(2, 4);
64 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
65 restore_gs_cb(current->thread.gs_cb);
66 preempt_enable();
67 vcpu->arch.sie_block->ecb |= ECB_GS;
68 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
69 vcpu->arch.gs_enabled = 1;
70 kvm_s390_retry_instr(vcpu);
71 return 0;
72 } else
73 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
74 }
75
76 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
77 {
78 int code = vcpu->arch.sie_block->ipb & 0xff;
79
80 if (code == 0x49 || code == 0x4d)
81 return handle_gs(vcpu);
82 else
83 return -EOPNOTSUPP;
84 }
85 /* Handle SCK (SET CLOCK) interception */
86 static int handle_set_clock(struct kvm_vcpu *vcpu)
87 {
88 struct kvm_s390_vm_tod_clock gtod = { 0 };
89 int rc;
90 u8 ar;
91 u64 op2;
92
93 vcpu->stat.instruction_sck++;
94
95 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
96 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
97
98 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
99 if (op2 & 7) /* Operand must be on a doubleword boundary */
100 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
101 rc = read_guest(vcpu, op2, ar, &gtod.tod, sizeof(gtod.tod));
102 if (rc)
103 return kvm_s390_inject_prog_cond(vcpu, rc);
104
105 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
106 kvm_s390_set_tod_clock(vcpu->kvm, &gtod);
107
108 kvm_s390_set_psw_cc(vcpu, 0);
109 return 0;
110 }
111
112 static int handle_set_prefix(struct kvm_vcpu *vcpu)
113 {
114 u64 operand2;
115 u32 address;
116 int rc;
117 u8 ar;
118
119 vcpu->stat.instruction_spx++;
120
121 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
122 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
123
124 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
125
126 /* must be word boundary */
127 if (operand2 & 3)
128 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
129
130 /* get the value */
131 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
132 if (rc)
133 return kvm_s390_inject_prog_cond(vcpu, rc);
134
135 address &= 0x7fffe000u;
136
137 /*
138 * Make sure the new value is valid memory. We only need to check the
139 * first page, since address is 8k aligned and memory pieces are always
140 * at least 1MB aligned and have at least a size of 1MB.
141 */
142 if (kvm_is_error_gpa(vcpu->kvm, address))
143 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
144
145 kvm_s390_set_prefix(vcpu, address);
146 trace_kvm_s390_handle_prefix(vcpu, 1, address);
147 return 0;
148 }
149
150 static int handle_store_prefix(struct kvm_vcpu *vcpu)
151 {
152 u64 operand2;
153 u32 address;
154 int rc;
155 u8 ar;
156
157 vcpu->stat.instruction_stpx++;
158
159 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
160 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
161
162 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
163
164 /* must be word boundary */
165 if (operand2 & 3)
166 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
167
168 address = kvm_s390_get_prefix(vcpu);
169
170 /* get the value */
171 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
172 if (rc)
173 return kvm_s390_inject_prog_cond(vcpu, rc);
174
175 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
176 trace_kvm_s390_handle_prefix(vcpu, 0, address);
177 return 0;
178 }
179
180 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
181 {
182 u16 vcpu_id = vcpu->vcpu_id;
183 u64 ga;
184 int rc;
185 u8 ar;
186
187 vcpu->stat.instruction_stap++;
188
189 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
190 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
191
192 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
193
194 if (ga & 1)
195 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
196
197 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
198 if (rc)
199 return kvm_s390_inject_prog_cond(vcpu, rc);
200
201 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
202 trace_kvm_s390_handle_stap(vcpu, ga);
203 return 0;
204 }
205
206 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
207 {
208 int rc = 0;
209 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
210
211 trace_kvm_s390_skey_related_inst(vcpu);
212 if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) &&
213 !kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
214 return rc;
215
216 rc = s390_enable_skey();
217 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
218 if (!rc) {
219 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
220 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
221 else
222 sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE |
223 ICTL_RRBE);
224 }
225 return rc;
226 }
227
228 static int try_handle_skey(struct kvm_vcpu *vcpu)
229 {
230 int rc;
231
232 rc = kvm_s390_skey_check_enable(vcpu);
233 if (rc)
234 return rc;
235 if (sclp.has_skey) {
236 /* with storage-key facility, SIE interprets it for us */
237 kvm_s390_retry_instr(vcpu);
238 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
239 return -EAGAIN;
240 }
241 return 0;
242 }
243
244 static int handle_iske(struct kvm_vcpu *vcpu)
245 {
246 unsigned long addr;
247 unsigned char key;
248 int reg1, reg2;
249 int rc;
250
251 vcpu->stat.instruction_iske++;
252
253 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
254 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
255
256 rc = try_handle_skey(vcpu);
257 if (rc)
258 return rc != -EAGAIN ? rc : 0;
259
260 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
261
262 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
263 addr = kvm_s390_logical_to_effective(vcpu, addr);
264 addr = kvm_s390_real_to_abs(vcpu, addr);
265 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
266 if (kvm_is_error_hva(addr))
267 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
268
269 down_read(&current->mm->mmap_sem);
270 rc = get_guest_storage_key(current->mm, addr, &key);
271 up_read(&current->mm->mmap_sem);
272 if (rc)
273 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
274 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
275 vcpu->run->s.regs.gprs[reg1] |= key;
276 return 0;
277 }
278
279 static int handle_rrbe(struct kvm_vcpu *vcpu)
280 {
281 unsigned long addr;
282 int reg1, reg2;
283 int rc;
284
285 vcpu->stat.instruction_rrbe++;
286
287 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
288 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
289
290 rc = try_handle_skey(vcpu);
291 if (rc)
292 return rc != -EAGAIN ? rc : 0;
293
294 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
295
296 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
297 addr = kvm_s390_logical_to_effective(vcpu, addr);
298 addr = kvm_s390_real_to_abs(vcpu, addr);
299 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
300 if (kvm_is_error_hva(addr))
301 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
302
303 down_read(&current->mm->mmap_sem);
304 rc = reset_guest_reference_bit(current->mm, addr);
305 up_read(&current->mm->mmap_sem);
306 if (rc < 0)
307 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
308
309 kvm_s390_set_psw_cc(vcpu, rc);
310 return 0;
311 }
312
313 #define SSKE_NQ 0x8
314 #define SSKE_MR 0x4
315 #define SSKE_MC 0x2
316 #define SSKE_MB 0x1
317 static int handle_sske(struct kvm_vcpu *vcpu)
318 {
319 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
320 unsigned long start, end;
321 unsigned char key, oldkey;
322 int reg1, reg2;
323 int rc;
324
325 vcpu->stat.instruction_sske++;
326
327 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
328 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
329
330 rc = try_handle_skey(vcpu);
331 if (rc)
332 return rc != -EAGAIN ? rc : 0;
333
334 if (!test_kvm_facility(vcpu->kvm, 8))
335 m3 &= ~SSKE_MB;
336 if (!test_kvm_facility(vcpu->kvm, 10))
337 m3 &= ~(SSKE_MC | SSKE_MR);
338 if (!test_kvm_facility(vcpu->kvm, 14))
339 m3 &= ~SSKE_NQ;
340
341 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
342
343 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
344 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
345 start = kvm_s390_logical_to_effective(vcpu, start);
346 if (m3 & SSKE_MB) {
347 /* start already designates an absolute address */
348 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
349 } else {
350 start = kvm_s390_real_to_abs(vcpu, start);
351 end = start + PAGE_SIZE;
352 }
353
354 while (start != end) {
355 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
356
357 if (kvm_is_error_hva(addr))
358 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
359
360 down_read(&current->mm->mmap_sem);
361 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
362 m3 & SSKE_NQ, m3 & SSKE_MR,
363 m3 & SSKE_MC);
364 up_read(&current->mm->mmap_sem);
365 if (rc < 0)
366 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
367 start += PAGE_SIZE;
368 }
369
370 if (m3 & (SSKE_MC | SSKE_MR)) {
371 if (m3 & SSKE_MB) {
372 /* skey in reg1 is unpredictable */
373 kvm_s390_set_psw_cc(vcpu, 3);
374 } else {
375 kvm_s390_set_psw_cc(vcpu, rc);
376 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
377 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
378 }
379 }
380 if (m3 & SSKE_MB) {
381 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
382 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
383 else
384 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
385 end = kvm_s390_logical_to_effective(vcpu, end);
386 vcpu->run->s.regs.gprs[reg2] |= end;
387 }
388 return 0;
389 }
390
391 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
392 {
393 vcpu->stat.instruction_ipte_interlock++;
394 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
395 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
396 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
397 kvm_s390_retry_instr(vcpu);
398 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
399 return 0;
400 }
401
402 static int handle_test_block(struct kvm_vcpu *vcpu)
403 {
404 gpa_t addr;
405 int reg2;
406
407 vcpu->stat.instruction_tb++;
408
409 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
410 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
411
412 kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
413 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
414 addr = kvm_s390_logical_to_effective(vcpu, addr);
415 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
416 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
417 addr = kvm_s390_real_to_abs(vcpu, addr);
418
419 if (kvm_is_error_gpa(vcpu->kvm, addr))
420 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
421 /*
422 * We don't expect errors on modern systems, and do not care
423 * about storage keys (yet), so let's just clear the page.
424 */
425 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
426 return -EFAULT;
427 kvm_s390_set_psw_cc(vcpu, 0);
428 vcpu->run->s.regs.gprs[0] = 0;
429 return 0;
430 }
431
432 static int handle_tpi(struct kvm_vcpu *vcpu)
433 {
434 struct kvm_s390_interrupt_info *inti;
435 unsigned long len;
436 u32 tpi_data[3];
437 int rc;
438 u64 addr;
439 u8 ar;
440
441 vcpu->stat.instruction_tpi++;
442
443 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
444 if (addr & 3)
445 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
446
447 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
448 if (!inti) {
449 kvm_s390_set_psw_cc(vcpu, 0);
450 return 0;
451 }
452
453 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
454 tpi_data[1] = inti->io.io_int_parm;
455 tpi_data[2] = inti->io.io_int_word;
456 if (addr) {
457 /*
458 * Store the two-word I/O interruption code into the
459 * provided area.
460 */
461 len = sizeof(tpi_data) - 4;
462 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
463 if (rc) {
464 rc = kvm_s390_inject_prog_cond(vcpu, rc);
465 goto reinject_interrupt;
466 }
467 } else {
468 /*
469 * Store the three-word I/O interruption code into
470 * the appropriate lowcore area.
471 */
472 len = sizeof(tpi_data);
473 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
474 /* failed writes to the low core are not recoverable */
475 rc = -EFAULT;
476 goto reinject_interrupt;
477 }
478 }
479
480 /* irq was successfully handed to the guest */
481 kfree(inti);
482 kvm_s390_set_psw_cc(vcpu, 1);
483 return 0;
484 reinject_interrupt:
485 /*
486 * If we encounter a problem storing the interruption code, the
487 * instruction is suppressed from the guest's view: reinject the
488 * interrupt.
489 */
490 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
491 kfree(inti);
492 rc = -EFAULT;
493 }
494 /* don't set the cc, a pgm irq was injected or we drop to user space */
495 return rc ? -EFAULT : 0;
496 }
497
498 static int handle_tsch(struct kvm_vcpu *vcpu)
499 {
500 struct kvm_s390_interrupt_info *inti = NULL;
501 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
502
503 vcpu->stat.instruction_tsch++;
504
505 /* a valid schid has at least one bit set */
506 if (vcpu->run->s.regs.gprs[1])
507 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
508 vcpu->run->s.regs.gprs[1]);
509
510 /*
511 * Prepare exit to userspace.
512 * We indicate whether we dequeued a pending I/O interrupt
513 * so that userspace can re-inject it if the instruction gets
514 * a program check. While this may re-order the pending I/O
515 * interrupts, this is no problem since the priority is kept
516 * intact.
517 */
518 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
519 vcpu->run->s390_tsch.dequeued = !!inti;
520 if (inti) {
521 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
522 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
523 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
524 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
525 }
526 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
527 kfree(inti);
528 return -EREMOTE;
529 }
530
531 static int handle_io_inst(struct kvm_vcpu *vcpu)
532 {
533 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
534
535 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
536 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
537
538 if (vcpu->kvm->arch.css_support) {
539 /*
540 * Most I/O instructions will be handled by userspace.
541 * Exceptions are tpi and the interrupt portion of tsch.
542 */
543 if (vcpu->arch.sie_block->ipa == 0xb236)
544 return handle_tpi(vcpu);
545 if (vcpu->arch.sie_block->ipa == 0xb235)
546 return handle_tsch(vcpu);
547 /* Handle in userspace. */
548 vcpu->stat.instruction_io_other++;
549 return -EOPNOTSUPP;
550 } else {
551 /*
552 * Set condition code 3 to stop the guest from issuing channel
553 * I/O instructions.
554 */
555 kvm_s390_set_psw_cc(vcpu, 3);
556 return 0;
557 }
558 }
559
560 static int handle_stfl(struct kvm_vcpu *vcpu)
561 {
562 int rc;
563 unsigned int fac;
564
565 vcpu->stat.instruction_stfl++;
566
567 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
568 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
569
570 /*
571 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
572 * into a u32 memory representation. They will remain bits 0-31.
573 */
574 fac = *vcpu->kvm->arch.model.fac_list >> 32;
575 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
576 &fac, sizeof(fac));
577 if (rc)
578 return rc;
579 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
580 trace_kvm_s390_handle_stfl(vcpu, fac);
581 return 0;
582 }
583
584 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
585 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
586 #define PSW_ADDR_24 0x0000000000ffffffUL
587 #define PSW_ADDR_31 0x000000007fffffffUL
588
589 int is_valid_psw(psw_t *psw)
590 {
591 if (psw->mask & PSW_MASK_UNASSIGNED)
592 return 0;
593 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
594 if (psw->addr & ~PSW_ADDR_31)
595 return 0;
596 }
597 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
598 return 0;
599 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
600 return 0;
601 if (psw->addr & 1)
602 return 0;
603 return 1;
604 }
605
606 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
607 {
608 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
609 psw_compat_t new_psw;
610 u64 addr;
611 int rc;
612 u8 ar;
613
614 vcpu->stat.instruction_lpsw++;
615
616 if (gpsw->mask & PSW_MASK_PSTATE)
617 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
618
619 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
620 if (addr & 7)
621 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
622
623 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
624 if (rc)
625 return kvm_s390_inject_prog_cond(vcpu, rc);
626 if (!(new_psw.mask & PSW32_MASK_BASE))
627 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
628 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
629 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
630 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
631 if (!is_valid_psw(gpsw))
632 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
633 return 0;
634 }
635
636 static int handle_lpswe(struct kvm_vcpu *vcpu)
637 {
638 psw_t new_psw;
639 u64 addr;
640 int rc;
641 u8 ar;
642
643 vcpu->stat.instruction_lpswe++;
644
645 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
646 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
647
648 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
649 if (addr & 7)
650 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
651 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
652 if (rc)
653 return kvm_s390_inject_prog_cond(vcpu, rc);
654 vcpu->arch.sie_block->gpsw = new_psw;
655 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
656 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
657 return 0;
658 }
659
660 static int handle_stidp(struct kvm_vcpu *vcpu)
661 {
662 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
663 u64 operand2;
664 int rc;
665 u8 ar;
666
667 vcpu->stat.instruction_stidp++;
668
669 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
670 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
671
672 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
673
674 if (operand2 & 7)
675 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
676
677 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
678 if (rc)
679 return kvm_s390_inject_prog_cond(vcpu, rc);
680
681 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
682 return 0;
683 }
684
685 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
686 {
687 int cpus = 0;
688 int n;
689
690 cpus = atomic_read(&vcpu->kvm->online_vcpus);
691
692 /* deal with other level 3 hypervisors */
693 if (stsi(mem, 3, 2, 2))
694 mem->count = 0;
695 if (mem->count < 8)
696 mem->count++;
697 for (n = mem->count - 1; n > 0 ; n--)
698 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
699
700 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
701 mem->vm[0].cpus_total = cpus;
702 mem->vm[0].cpus_configured = cpus;
703 mem->vm[0].cpus_standby = 0;
704 mem->vm[0].cpus_reserved = 0;
705 mem->vm[0].caf = 1000;
706 memcpy(mem->vm[0].name, "KVMguest", 8);
707 ASCEBC(mem->vm[0].name, 8);
708 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
709 ASCEBC(mem->vm[0].cpi, 16);
710 }
711
712 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
713 u8 fc, u8 sel1, u16 sel2)
714 {
715 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
716 vcpu->run->s390_stsi.addr = addr;
717 vcpu->run->s390_stsi.ar = ar;
718 vcpu->run->s390_stsi.fc = fc;
719 vcpu->run->s390_stsi.sel1 = sel1;
720 vcpu->run->s390_stsi.sel2 = sel2;
721 }
722
723 static int handle_stsi(struct kvm_vcpu *vcpu)
724 {
725 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
726 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
727 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
728 unsigned long mem = 0;
729 u64 operand2;
730 int rc = 0;
731 u8 ar;
732
733 vcpu->stat.instruction_stsi++;
734 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
735
736 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
737 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
738
739 if (fc > 3) {
740 kvm_s390_set_psw_cc(vcpu, 3);
741 return 0;
742 }
743
744 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
745 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
746 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
747
748 if (fc == 0) {
749 vcpu->run->s.regs.gprs[0] = 3 << 28;
750 kvm_s390_set_psw_cc(vcpu, 0);
751 return 0;
752 }
753
754 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
755
756 if (operand2 & 0xfff)
757 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
758
759 switch (fc) {
760 case 1: /* same handling for 1 and 2 */
761 case 2:
762 mem = get_zeroed_page(GFP_KERNEL);
763 if (!mem)
764 goto out_no_data;
765 if (stsi((void *) mem, fc, sel1, sel2))
766 goto out_no_data;
767 break;
768 case 3:
769 if (sel1 != 2 || sel2 != 2)
770 goto out_no_data;
771 mem = get_zeroed_page(GFP_KERNEL);
772 if (!mem)
773 goto out_no_data;
774 handle_stsi_3_2_2(vcpu, (void *) mem);
775 break;
776 }
777
778 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
779 if (rc) {
780 rc = kvm_s390_inject_prog_cond(vcpu, rc);
781 goto out;
782 }
783 if (vcpu->kvm->arch.user_stsi) {
784 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
785 rc = -EREMOTE;
786 }
787 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
788 free_page(mem);
789 kvm_s390_set_psw_cc(vcpu, 0);
790 vcpu->run->s.regs.gprs[0] = 0;
791 return rc;
792 out_no_data:
793 kvm_s390_set_psw_cc(vcpu, 3);
794 out:
795 free_page(mem);
796 return rc;
797 }
798
799 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
800 {
801 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
802 case 0x02:
803 return handle_stidp(vcpu);
804 case 0x04:
805 return handle_set_clock(vcpu);
806 case 0x10:
807 return handle_set_prefix(vcpu);
808 case 0x11:
809 return handle_store_prefix(vcpu);
810 case 0x12:
811 return handle_store_cpu_address(vcpu);
812 case 0x14:
813 return kvm_s390_handle_vsie(vcpu);
814 case 0x21:
815 case 0x50:
816 return handle_ipte_interlock(vcpu);
817 case 0x29:
818 return handle_iske(vcpu);
819 case 0x2a:
820 return handle_rrbe(vcpu);
821 case 0x2b:
822 return handle_sske(vcpu);
823 case 0x2c:
824 return handle_test_block(vcpu);
825 case 0x30:
826 case 0x31:
827 case 0x32:
828 case 0x33:
829 case 0x34:
830 case 0x35:
831 case 0x36:
832 case 0x37:
833 case 0x38:
834 case 0x39:
835 case 0x3a:
836 case 0x3b:
837 case 0x3c:
838 case 0x5f:
839 case 0x74:
840 case 0x76:
841 return handle_io_inst(vcpu);
842 case 0x56:
843 return handle_sthyi(vcpu);
844 case 0x7d:
845 return handle_stsi(vcpu);
846 case 0xb1:
847 return handle_stfl(vcpu);
848 case 0xb2:
849 return handle_lpswe(vcpu);
850 default:
851 return -EOPNOTSUPP;
852 }
853 }
854
855 static int handle_epsw(struct kvm_vcpu *vcpu)
856 {
857 int reg1, reg2;
858
859 vcpu->stat.instruction_epsw++;
860
861 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
862
863 /* This basically extracts the mask half of the psw. */
864 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
865 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
866 if (reg2) {
867 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
868 vcpu->run->s.regs.gprs[reg2] |=
869 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
870 }
871 return 0;
872 }
873
874 #define PFMF_RESERVED 0xfffc0101UL
875 #define PFMF_SK 0x00020000UL
876 #define PFMF_CF 0x00010000UL
877 #define PFMF_UI 0x00008000UL
878 #define PFMF_FSC 0x00007000UL
879 #define PFMF_NQ 0x00000800UL
880 #define PFMF_MR 0x00000400UL
881 #define PFMF_MC 0x00000200UL
882 #define PFMF_KEY 0x000000feUL
883
884 static int handle_pfmf(struct kvm_vcpu *vcpu)
885 {
886 bool mr = false, mc = false, nq;
887 int reg1, reg2;
888 unsigned long start, end;
889 unsigned char key;
890
891 vcpu->stat.instruction_pfmf++;
892
893 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
894
895 if (!test_kvm_facility(vcpu->kvm, 8))
896 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
897
898 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
899 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
900
901 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
902 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
903
904 /* Only provide non-quiescing support if enabled for the guest */
905 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
906 !test_kvm_facility(vcpu->kvm, 14))
907 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
908
909 /* Only provide conditional-SSKE support if enabled for the guest */
910 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
911 test_kvm_facility(vcpu->kvm, 10)) {
912 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
913 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
914 }
915
916 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
917 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
918 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
919 start = kvm_s390_logical_to_effective(vcpu, start);
920
921 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
922 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
923 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
924 }
925
926 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
927 case 0x00000000:
928 /* only 4k frames specify a real address */
929 start = kvm_s390_real_to_abs(vcpu, start);
930 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
931 break;
932 case 0x00001000:
933 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
934 break;
935 case 0x00002000:
936 /* only support 2G frame size if EDAT2 is available and we are
937 not in 24-bit addressing mode */
938 if (!test_kvm_facility(vcpu->kvm, 78) ||
939 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
940 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
941 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
942 break;
943 default:
944 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
945 }
946
947 while (start != end) {
948 unsigned long useraddr;
949
950 /* Translate guest address to host address */
951 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
952 if (kvm_is_error_hva(useraddr))
953 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
954
955 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
956 if (clear_user((void __user *)useraddr, PAGE_SIZE))
957 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
958 }
959
960 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
961 int rc = kvm_s390_skey_check_enable(vcpu);
962
963 if (rc)
964 return rc;
965 down_read(&current->mm->mmap_sem);
966 rc = cond_set_guest_storage_key(current->mm, useraddr,
967 key, NULL, nq, mr, mc);
968 up_read(&current->mm->mmap_sem);
969 if (rc < 0)
970 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
971 }
972
973 start += PAGE_SIZE;
974 }
975 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
976 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
977 vcpu->run->s.regs.gprs[reg2] = end;
978 } else {
979 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
980 end = kvm_s390_logical_to_effective(vcpu, end);
981 vcpu->run->s.regs.gprs[reg2] |= end;
982 }
983 }
984 return 0;
985 }
986
987 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
988 {
989 struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state;
990 int r1, r2, nappended, entries;
991 unsigned long gfn, hva, res, pgstev, ptev;
992 unsigned long *cbrlo;
993
994 /*
995 * We don't need to set SD.FPF.SK to 1 here, because if we have a
996 * machine check here we either handle it or crash
997 */
998
999 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1000 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1001 hva = gfn_to_hva(vcpu->kvm, gfn);
1002 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1003
1004 if (kvm_is_error_hva(hva))
1005 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1006
1007 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1008 if (nappended < 0) {
1009 res = orc ? 0x10 : 0;
1010 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1011 return 0;
1012 }
1013 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1014 /*
1015 * Set the block-content state part of the result. 0 means resident, so
1016 * nothing to do if the page is valid. 2 is for preserved pages
1017 * (non-present and non-zero), and 3 for zero pages (non-present and
1018 * zero).
1019 */
1020 if (ptev & _PAGE_INVALID) {
1021 res |= 2;
1022 if (pgstev & _PGSTE_GPS_ZERO)
1023 res |= 1;
1024 }
1025 if (pgstev & _PGSTE_GPS_NODAT)
1026 res |= 0x20;
1027 vcpu->run->s.regs.gprs[r1] = res;
1028 /*
1029 * It is possible that all the normal 511 slots were full, in which case
1030 * we will now write in the 512th slot, which is reserved for host use.
1031 * In both cases we let the normal essa handling code process all the
1032 * slots, including the reserved one, if needed.
1033 */
1034 if (nappended > 0) {
1035 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1036 cbrlo[entries] = gfn << PAGE_SHIFT;
1037 }
1038
1039 if (orc && gfn < ms->bitmap_size) {
1040 /* increment only if we are really flipping the bit to 1 */
1041 if (!test_and_set_bit(gfn, ms->pgste_bitmap))
1042 atomic64_inc(&ms->dirty_pages);
1043 }
1044
1045 return nappended;
1046 }
1047
1048 static int handle_essa(struct kvm_vcpu *vcpu)
1049 {
1050 /* entries expected to be 1FF */
1051 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1052 unsigned long *cbrlo;
1053 struct gmap *gmap;
1054 int i, orc;
1055
1056 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1057 gmap = vcpu->arch.gmap;
1058 vcpu->stat.instruction_essa++;
1059 if (!vcpu->kvm->arch.use_cmma)
1060 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1061
1062 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1063 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1064 /* Check for invalid operation request code */
1065 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1066 /* ORCs 0-6 are always valid */
1067 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1068 : ESSA_SET_STABLE_IF_RESIDENT))
1069 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1070
1071 if (likely(!vcpu->kvm->arch.migration_state)) {
1072 /*
1073 * CMMA is enabled in the KVM settings, but is disabled in
1074 * the SIE block and in the mm_context, and we are not doing
1075 * a migration. Enable CMMA in the mm_context.
1076 * Since we need to take a write lock to write to the context
1077 * to avoid races with storage keys handling, we check if the
1078 * value really needs to be written to; if the value is
1079 * already correct, we do nothing and avoid the lock.
1080 */
1081 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1082 down_write(&vcpu->kvm->mm->mmap_sem);
1083 vcpu->kvm->mm->context.uses_cmm = 1;
1084 up_write(&vcpu->kvm->mm->mmap_sem);
1085 }
1086 /*
1087 * If we are here, we are supposed to have CMMA enabled in
1088 * the SIE block. Enabling CMMA works on a per-CPU basis,
1089 * while the context use_cmma flag is per process.
1090 * It's possible that the context flag is enabled and the
1091 * SIE flag is not, so we set the flag always; if it was
1092 * already set, nothing changes, otherwise we enable it
1093 * on this CPU too.
1094 */
1095 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1096 /* Retry the ESSA instruction */
1097 kvm_s390_retry_instr(vcpu);
1098 } else {
1099 /* Account for the possible extra cbrl entry */
1100 i = do_essa(vcpu, orc);
1101 if (i < 0)
1102 return i;
1103 entries += i;
1104 }
1105 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1106 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1107 down_read(&gmap->mm->mmap_sem);
1108 for (i = 0; i < entries; ++i)
1109 __gmap_zap(gmap, cbrlo[i]);
1110 up_read(&gmap->mm->mmap_sem);
1111 return 0;
1112 }
1113
1114 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1115 {
1116 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1117 case 0x8a:
1118 case 0x8e:
1119 case 0x8f:
1120 return handle_ipte_interlock(vcpu);
1121 case 0x8d:
1122 return handle_epsw(vcpu);
1123 case 0xab:
1124 return handle_essa(vcpu);
1125 case 0xaf:
1126 return handle_pfmf(vcpu);
1127 default:
1128 return -EOPNOTSUPP;
1129 }
1130 }
1131
1132 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1133 {
1134 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1135 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1136 int reg, rc, nr_regs;
1137 u32 ctl_array[16];
1138 u64 ga;
1139 u8 ar;
1140
1141 vcpu->stat.instruction_lctl++;
1142
1143 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1144 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1145
1146 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1147
1148 if (ga & 3)
1149 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1150
1151 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1152 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1153
1154 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1155 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1156 if (rc)
1157 return kvm_s390_inject_prog_cond(vcpu, rc);
1158 reg = reg1;
1159 nr_regs = 0;
1160 do {
1161 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1162 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1163 if (reg == reg3)
1164 break;
1165 reg = (reg + 1) % 16;
1166 } while (1);
1167 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1168 return 0;
1169 }
1170
1171 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1172 {
1173 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1174 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1175 int reg, rc, nr_regs;
1176 u32 ctl_array[16];
1177 u64 ga;
1178 u8 ar;
1179
1180 vcpu->stat.instruction_stctl++;
1181
1182 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1183 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1184
1185 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1186
1187 if (ga & 3)
1188 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1189
1190 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1191 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1192
1193 reg = reg1;
1194 nr_regs = 0;
1195 do {
1196 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1197 if (reg == reg3)
1198 break;
1199 reg = (reg + 1) % 16;
1200 } while (1);
1201 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1202 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1203 }
1204
1205 static int handle_lctlg(struct kvm_vcpu *vcpu)
1206 {
1207 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1208 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1209 int reg, rc, nr_regs;
1210 u64 ctl_array[16];
1211 u64 ga;
1212 u8 ar;
1213
1214 vcpu->stat.instruction_lctlg++;
1215
1216 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1217 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1218
1219 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1220
1221 if (ga & 7)
1222 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1223
1224 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1225 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1226
1227 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1228 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1229 if (rc)
1230 return kvm_s390_inject_prog_cond(vcpu, rc);
1231 reg = reg1;
1232 nr_regs = 0;
1233 do {
1234 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1235 if (reg == reg3)
1236 break;
1237 reg = (reg + 1) % 16;
1238 } while (1);
1239 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1240 return 0;
1241 }
1242
1243 static int handle_stctg(struct kvm_vcpu *vcpu)
1244 {
1245 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1246 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1247 int reg, rc, nr_regs;
1248 u64 ctl_array[16];
1249 u64 ga;
1250 u8 ar;
1251
1252 vcpu->stat.instruction_stctg++;
1253
1254 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1255 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1256
1257 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1258
1259 if (ga & 7)
1260 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1261
1262 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1263 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1264
1265 reg = reg1;
1266 nr_regs = 0;
1267 do {
1268 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1269 if (reg == reg3)
1270 break;
1271 reg = (reg + 1) % 16;
1272 } while (1);
1273 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1274 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1275 }
1276
1277 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1278 {
1279 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1280 case 0x25:
1281 return handle_stctg(vcpu);
1282 case 0x2f:
1283 return handle_lctlg(vcpu);
1284 case 0x60:
1285 case 0x61:
1286 case 0x62:
1287 return handle_ri(vcpu);
1288 default:
1289 return -EOPNOTSUPP;
1290 }
1291 }
1292
1293 static int handle_tprot(struct kvm_vcpu *vcpu)
1294 {
1295 u64 address1, address2;
1296 unsigned long hva, gpa;
1297 int ret = 0, cc = 0;
1298 bool writable;
1299 u8 ar;
1300
1301 vcpu->stat.instruction_tprot++;
1302
1303 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1304 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1305
1306 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1307
1308 /* we only handle the Linux memory detection case:
1309 * access key == 0
1310 * everything else goes to userspace. */
1311 if (address2 & 0xf0)
1312 return -EOPNOTSUPP;
1313 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1314 ipte_lock(vcpu);
1315 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1316 if (ret == PGM_PROTECTION) {
1317 /* Write protected? Try again with read-only... */
1318 cc = 1;
1319 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1320 GACC_FETCH);
1321 }
1322 if (ret) {
1323 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1324 ret = kvm_s390_inject_program_int(vcpu, ret);
1325 } else if (ret > 0) {
1326 /* Translation not available */
1327 kvm_s390_set_psw_cc(vcpu, 3);
1328 ret = 0;
1329 }
1330 goto out_unlock;
1331 }
1332
1333 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1334 if (kvm_is_error_hva(hva)) {
1335 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1336 } else {
1337 if (!writable)
1338 cc = 1; /* Write not permitted ==> read-only */
1339 kvm_s390_set_psw_cc(vcpu, cc);
1340 /* Note: CC2 only occurs for storage keys (not supported yet) */
1341 }
1342 out_unlock:
1343 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1344 ipte_unlock(vcpu);
1345 return ret;
1346 }
1347
1348 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1349 {
1350 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1351 case 0x01:
1352 return handle_tprot(vcpu);
1353 default:
1354 return -EOPNOTSUPP;
1355 }
1356 }
1357
1358 static int handle_sckpf(struct kvm_vcpu *vcpu)
1359 {
1360 u32 value;
1361
1362 vcpu->stat.instruction_sckpf++;
1363
1364 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1365 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1366
1367 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1368 return kvm_s390_inject_program_int(vcpu,
1369 PGM_SPECIFICATION);
1370
1371 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1372 vcpu->arch.sie_block->todpr = value;
1373
1374 return 0;
1375 }
1376
1377 static int handle_ptff(struct kvm_vcpu *vcpu)
1378 {
1379 vcpu->stat.instruction_ptff++;
1380
1381 /* we don't emulate any control instructions yet */
1382 kvm_s390_set_psw_cc(vcpu, 3);
1383 return 0;
1384 }
1385
1386 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1387 {
1388 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1389 case 0x04:
1390 return handle_ptff(vcpu);
1391 case 0x07:
1392 return handle_sckpf(vcpu);
1393 default:
1394 return -EOPNOTSUPP;
1395 }
1396 }
Linux with added FPC-III support