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1/*
2 * handling privileged instructions
3 *
4 * Copyright IBM Corp. 2008, 2013
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
12 */
13
14#include <linux/kvm.h>
15#include <linux/gfp.h>
16#include <linux/errno.h>
17#include <linux/compat.h>
18#include <asm/asm-offsets.h>
19#include <asm/facility.h>
20#include <asm/current.h>
21#include <asm/debug.h>
22#include <asm/ebcdic.h>
23#include <asm/sysinfo.h>
24#include <asm/pgtable.h>
25#include <asm/pgalloc.h>
26#include <asm/gmap.h>
27#include <asm/io.h>
28#include <asm/ptrace.h>
29#include <asm/compat.h>
30#include "gaccess.h"
31#include "kvm-s390.h"
32#include "trace.h"
33
34/* Handle SCK (SET CLOCK) interception */
35static int handle_set_clock(struct kvm_vcpu *vcpu)
36{
37 int rc;
38 ar_t ar;
39 u64 op2, val;
40
41 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
42 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
43
44 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
45 if (op2 & 7) /* Operand must be on a doubleword boundary */
46 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
47 rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
48 if (rc)
49 return kvm_s390_inject_prog_cond(vcpu, rc);
50
51 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
52 kvm_s390_set_tod_clock(vcpu->kvm, val);
53
54 kvm_s390_set_psw_cc(vcpu, 0);
55 return 0;
56}
57
58static int handle_set_prefix(struct kvm_vcpu *vcpu)
59{
60 u64 operand2;
61 u32 address;
62 int rc;
63 ar_t ar;
64
65 vcpu->stat.instruction_spx++;
66
67 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
68 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
69
70 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
71
72 /* must be word boundary */
73 if (operand2 & 3)
74 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
75
76 /* get the value */
77 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
78 if (rc)
79 return kvm_s390_inject_prog_cond(vcpu, rc);
80
81 address &= 0x7fffe000u;
82
83 /*
84 * Make sure the new value is valid memory. We only need to check the
85 * first page, since address is 8k aligned and memory pieces are always
86 * at least 1MB aligned and have at least a size of 1MB.
87 */
88 if (kvm_is_error_gpa(vcpu->kvm, address))
89 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
90
91 kvm_s390_set_prefix(vcpu, address);
92 trace_kvm_s390_handle_prefix(vcpu, 1, address);
93 return 0;
94}
95
96static int handle_store_prefix(struct kvm_vcpu *vcpu)
97{
98 u64 operand2;
99 u32 address;
100 int rc;
101 ar_t ar;
102
103 vcpu->stat.instruction_stpx++;
104
105 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
106 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
107
108 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
109
110 /* must be word boundary */
111 if (operand2 & 3)
112 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
113
114 address = kvm_s390_get_prefix(vcpu);
115
116 /* get the value */
117 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
118 if (rc)
119 return kvm_s390_inject_prog_cond(vcpu, rc);
120
121 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
122 trace_kvm_s390_handle_prefix(vcpu, 0, address);
123 return 0;
124}
125
126static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
127{
128 u16 vcpu_id = vcpu->vcpu_id;
129 u64 ga;
130 int rc;
131 ar_t ar;
132
133 vcpu->stat.instruction_stap++;
134
135 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
136 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
137
138 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
139
140 if (ga & 1)
141 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
142
143 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
144 if (rc)
145 return kvm_s390_inject_prog_cond(vcpu, rc);
146
147 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
148 trace_kvm_s390_handle_stap(vcpu, ga);
149 return 0;
150}
151
152static int __skey_check_enable(struct kvm_vcpu *vcpu)
153{
154 int rc = 0;
155 if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
156 return rc;
157
158 rc = s390_enable_skey();
159 VCPU_EVENT(vcpu, 3, "%s", "enabling storage keys for guest");
160 trace_kvm_s390_skey_related_inst(vcpu);
161 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
162 return rc;
163}
164
165
166static int handle_skey(struct kvm_vcpu *vcpu)
167{
168 int rc = __skey_check_enable(vcpu);
169
170 if (rc)
171 return rc;
172 vcpu->stat.instruction_storage_key++;
173
174 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
175 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
176
177 kvm_s390_retry_instr(vcpu);
178 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
179 return 0;
180}
181
182static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
183{
184 vcpu->stat.instruction_ipte_interlock++;
185 if (psw_bits(vcpu->arch.sie_block->gpsw).p)
186 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
187 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
188 kvm_s390_retry_instr(vcpu);
189 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
190 return 0;
191}
192
193static int handle_test_block(struct kvm_vcpu *vcpu)
194{
195 gpa_t addr;
196 int reg2;
197
198 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
199 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
200
201 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
202 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
203 addr = kvm_s390_logical_to_effective(vcpu, addr);
204 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
205 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
206 addr = kvm_s390_real_to_abs(vcpu, addr);
207
208 if (kvm_is_error_gpa(vcpu->kvm, addr))
209 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
210 /*
211 * We don't expect errors on modern systems, and do not care
212 * about storage keys (yet), so let's just clear the page.
213 */
214 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
215 return -EFAULT;
216 kvm_s390_set_psw_cc(vcpu, 0);
217 vcpu->run->s.regs.gprs[0] = 0;
218 return 0;
219}
220
221static int handle_tpi(struct kvm_vcpu *vcpu)
222{
223 struct kvm_s390_interrupt_info *inti;
224 unsigned long len;
225 u32 tpi_data[3];
226 int rc;
227 u64 addr;
228 ar_t ar;
229
230 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
231 if (addr & 3)
232 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
233
234 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
235 if (!inti) {
236 kvm_s390_set_psw_cc(vcpu, 0);
237 return 0;
238 }
239
240 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
241 tpi_data[1] = inti->io.io_int_parm;
242 tpi_data[2] = inti->io.io_int_word;
243 if (addr) {
244 /*
245 * Store the two-word I/O interruption code into the
246 * provided area.
247 */
248 len = sizeof(tpi_data) - 4;
249 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
250 if (rc) {
251 rc = kvm_s390_inject_prog_cond(vcpu, rc);
252 goto reinject_interrupt;
253 }
254 } else {
255 /*
256 * Store the three-word I/O interruption code into
257 * the appropriate lowcore area.
258 */
259 len = sizeof(tpi_data);
260 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
261 /* failed writes to the low core are not recoverable */
262 rc = -EFAULT;
263 goto reinject_interrupt;
264 }
265 }
266
267 /* irq was successfully handed to the guest */
268 kfree(inti);
269 kvm_s390_set_psw_cc(vcpu, 1);
270 return 0;
271reinject_interrupt:
272 /*
273 * If we encounter a problem storing the interruption code, the
274 * instruction is suppressed from the guest's view: reinject the
275 * interrupt.
276 */
277 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
278 kfree(inti);
279 rc = -EFAULT;
280 }
281 /* don't set the cc, a pgm irq was injected or we drop to user space */
282 return rc ? -EFAULT : 0;
283}
284
285static int handle_tsch(struct kvm_vcpu *vcpu)
286{
287 struct kvm_s390_interrupt_info *inti = NULL;
288 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
289
290 /* a valid schid has at least one bit set */
291 if (vcpu->run->s.regs.gprs[1])
292 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
293 vcpu->run->s.regs.gprs[1]);
294
295 /*
296 * Prepare exit to userspace.
297 * We indicate whether we dequeued a pending I/O interrupt
298 * so that userspace can re-inject it if the instruction gets
299 * a program check. While this may re-order the pending I/O
300 * interrupts, this is no problem since the priority is kept
301 * intact.
302 */
303 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
304 vcpu->run->s390_tsch.dequeued = !!inti;
305 if (inti) {
306 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
307 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
308 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
309 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
310 }
311 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
312 kfree(inti);
313 return -EREMOTE;
314}
315
316static int handle_io_inst(struct kvm_vcpu *vcpu)
317{
318 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
319
320 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
321 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
322
323 if (vcpu->kvm->arch.css_support) {
324 /*
325 * Most I/O instructions will be handled by userspace.
326 * Exceptions are tpi and the interrupt portion of tsch.
327 */
328 if (vcpu->arch.sie_block->ipa == 0xb236)
329 return handle_tpi(vcpu);
330 if (vcpu->arch.sie_block->ipa == 0xb235)
331 return handle_tsch(vcpu);
332 /* Handle in userspace. */
333 return -EOPNOTSUPP;
334 } else {
335 /*
336 * Set condition code 3 to stop the guest from issuing channel
337 * I/O instructions.
338 */
339 kvm_s390_set_psw_cc(vcpu, 3);
340 return 0;
341 }
342}
343
344static int handle_stfl(struct kvm_vcpu *vcpu)
345{
346 int rc;
347 unsigned int fac;
348
349 vcpu->stat.instruction_stfl++;
350
351 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
352 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
353
354 /*
355 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
356 * into a u32 memory representation. They will remain bits 0-31.
357 */
358 fac = *vcpu->kvm->arch.model.fac_list >> 32;
359 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
360 &fac, sizeof(fac));
361 if (rc)
362 return rc;
363 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
364 trace_kvm_s390_handle_stfl(vcpu, fac);
365 return 0;
366}
367
368#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
369#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
370#define PSW_ADDR_24 0x0000000000ffffffUL
371#define PSW_ADDR_31 0x000000007fffffffUL
372
373int is_valid_psw(psw_t *psw)
374{
375 if (psw->mask & PSW_MASK_UNASSIGNED)
376 return 0;
377 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
378 if (psw->addr & ~PSW_ADDR_31)
379 return 0;
380 }
381 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
382 return 0;
383 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
384 return 0;
385 if (psw->addr & 1)
386 return 0;
387 return 1;
388}
389
390int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
391{
392 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
393 psw_compat_t new_psw;
394 u64 addr;
395 int rc;
396 ar_t ar;
397
398 if (gpsw->mask & PSW_MASK_PSTATE)
399 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
400
401 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
402 if (addr & 7)
403 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
404
405 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
406 if (rc)
407 return kvm_s390_inject_prog_cond(vcpu, rc);
408 if (!(new_psw.mask & PSW32_MASK_BASE))
409 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
410 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
411 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
412 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
413 if (!is_valid_psw(gpsw))
414 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
415 return 0;
416}
417
418static int handle_lpswe(struct kvm_vcpu *vcpu)
419{
420 psw_t new_psw;
421 u64 addr;
422 int rc;
423 ar_t ar;
424
425 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
426 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
427
428 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
429 if (addr & 7)
430 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
431 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
432 if (rc)
433 return kvm_s390_inject_prog_cond(vcpu, rc);
434 vcpu->arch.sie_block->gpsw = new_psw;
435 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
436 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
437 return 0;
438}
439
440static int handle_stidp(struct kvm_vcpu *vcpu)
441{
442 u64 stidp_data = vcpu->arch.stidp_data;
443 u64 operand2;
444 int rc;
445 ar_t ar;
446
447 vcpu->stat.instruction_stidp++;
448
449 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
450 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
451
452 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
453
454 if (operand2 & 7)
455 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
456
457 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
458 if (rc)
459 return kvm_s390_inject_prog_cond(vcpu, rc);
460
461 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
462 return 0;
463}
464
465static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
466{
467 int cpus = 0;
468 int n;
469
470 cpus = atomic_read(&vcpu->kvm->online_vcpus);
471
472 /* deal with other level 3 hypervisors */
473 if (stsi(mem, 3, 2, 2))
474 mem->count = 0;
475 if (mem->count < 8)
476 mem->count++;
477 for (n = mem->count - 1; n > 0 ; n--)
478 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
479
480 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
481 mem->vm[0].cpus_total = cpus;
482 mem->vm[0].cpus_configured = cpus;
483 mem->vm[0].cpus_standby = 0;
484 mem->vm[0].cpus_reserved = 0;
485 mem->vm[0].caf = 1000;
486 memcpy(mem->vm[0].name, "KVMguest", 8);
487 ASCEBC(mem->vm[0].name, 8);
488 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
489 ASCEBC(mem->vm[0].cpi, 16);
490}
491
492static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
493 u8 fc, u8 sel1, u16 sel2)
494{
495 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
496 vcpu->run->s390_stsi.addr = addr;
497 vcpu->run->s390_stsi.ar = ar;
498 vcpu->run->s390_stsi.fc = fc;
499 vcpu->run->s390_stsi.sel1 = sel1;
500 vcpu->run->s390_stsi.sel2 = sel2;
501}
502
503static int handle_stsi(struct kvm_vcpu *vcpu)
504{
505 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
506 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
507 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
508 unsigned long mem = 0;
509 u64 operand2;
510 int rc = 0;
511 ar_t ar;
512
513 vcpu->stat.instruction_stsi++;
514 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
515
516 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
517 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
518
519 if (fc > 3) {
520 kvm_s390_set_psw_cc(vcpu, 3);
521 return 0;
522 }
523
524 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
525 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
526 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
527
528 if (fc == 0) {
529 vcpu->run->s.regs.gprs[0] = 3 << 28;
530 kvm_s390_set_psw_cc(vcpu, 0);
531 return 0;
532 }
533
534 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
535
536 if (operand2 & 0xfff)
537 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
538
539 switch (fc) {
540 case 1: /* same handling for 1 and 2 */
541 case 2:
542 mem = get_zeroed_page(GFP_KERNEL);
543 if (!mem)
544 goto out_no_data;
545 if (stsi((void *) mem, fc, sel1, sel2))
546 goto out_no_data;
547 break;
548 case 3:
549 if (sel1 != 2 || sel2 != 2)
550 goto out_no_data;
551 mem = get_zeroed_page(GFP_KERNEL);
552 if (!mem)
553 goto out_no_data;
554 handle_stsi_3_2_2(vcpu, (void *) mem);
555 break;
556 }
557
558 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
559 if (rc) {
560 rc = kvm_s390_inject_prog_cond(vcpu, rc);
561 goto out;
562 }
563 if (vcpu->kvm->arch.user_stsi) {
564 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
565 rc = -EREMOTE;
566 }
567 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
568 free_page(mem);
569 kvm_s390_set_psw_cc(vcpu, 0);
570 vcpu->run->s.regs.gprs[0] = 0;
571 return rc;
572out_no_data:
573 kvm_s390_set_psw_cc(vcpu, 3);
574out:
575 free_page(mem);
576 return rc;
577}
578
579static const intercept_handler_t b2_handlers[256] = {
580 [0x02] = handle_stidp,
581 [0x04] = handle_set_clock,
582 [0x10] = handle_set_prefix,
583 [0x11] = handle_store_prefix,
584 [0x12] = handle_store_cpu_address,
585 [0x21] = handle_ipte_interlock,
586 [0x29] = handle_skey,
587 [0x2a] = handle_skey,
588 [0x2b] = handle_skey,
589 [0x2c] = handle_test_block,
590 [0x30] = handle_io_inst,
591 [0x31] = handle_io_inst,
592 [0x32] = handle_io_inst,
593 [0x33] = handle_io_inst,
594 [0x34] = handle_io_inst,
595 [0x35] = handle_io_inst,
596 [0x36] = handle_io_inst,
597 [0x37] = handle_io_inst,
598 [0x38] = handle_io_inst,
599 [0x39] = handle_io_inst,
600 [0x3a] = handle_io_inst,
601 [0x3b] = handle_io_inst,
602 [0x3c] = handle_io_inst,
603 [0x50] = handle_ipte_interlock,
604 [0x5f] = handle_io_inst,
605 [0x74] = handle_io_inst,
606 [0x76] = handle_io_inst,
607 [0x7d] = handle_stsi,
608 [0xb1] = handle_stfl,
609 [0xb2] = handle_lpswe,
610};
611
612int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
613{
614 intercept_handler_t handler;
615
616 /*
617 * A lot of B2 instructions are priviledged. Here we check for
618 * the privileged ones, that we can handle in the kernel.
619 * Anything else goes to userspace.
620 */
621 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
622 if (handler)
623 return handler(vcpu);
624
625 return -EOPNOTSUPP;
626}
627
628static int handle_epsw(struct kvm_vcpu *vcpu)
629{
630 int reg1, reg2;
631
632 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
633
634 /* This basically extracts the mask half of the psw. */
635 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
636 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
637 if (reg2) {
638 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
639 vcpu->run->s.regs.gprs[reg2] |=
640 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
641 }
642 return 0;
643}
644
645#define PFMF_RESERVED 0xfffc0101UL
646#define PFMF_SK 0x00020000UL
647#define PFMF_CF 0x00010000UL
648#define PFMF_UI 0x00008000UL
649#define PFMF_FSC 0x00007000UL
650#define PFMF_NQ 0x00000800UL
651#define PFMF_MR 0x00000400UL
652#define PFMF_MC 0x00000200UL
653#define PFMF_KEY 0x000000feUL
654
655static int handle_pfmf(struct kvm_vcpu *vcpu)
656{
657 int reg1, reg2;
658 unsigned long start, end;
659
660 vcpu->stat.instruction_pfmf++;
661
662 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
663
664 if (!test_kvm_facility(vcpu->kvm, 8))
665 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
666
667 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
668 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
669
670 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
671 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
672
673 /* Only provide non-quiescing support if the host supports it */
674 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
675 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
676
677 /* No support for conditional-SSKE */
678 if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
679 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
680
681 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
682 start = kvm_s390_logical_to_effective(vcpu, start);
683
684 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
685 case 0x00000000:
686 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
687 break;
688 case 0x00001000:
689 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
690 break;
691 case 0x00002000:
692 /* only support 2G frame size if EDAT2 is available and we are
693 not in 24-bit addressing mode */
694 if (!test_kvm_facility(vcpu->kvm, 78) ||
695 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
696 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
697 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
698 break;
699 default:
700 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
701 }
702
703 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
704 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
705 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
706 }
707
708 while (start < end) {
709 unsigned long useraddr, abs_addr;
710
711 /* Translate guest address to host address */
712 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
713 abs_addr = kvm_s390_real_to_abs(vcpu, start);
714 else
715 abs_addr = start;
716 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
717 if (kvm_is_error_hva(useraddr))
718 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
719
720 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
721 if (clear_user((void __user *)useraddr, PAGE_SIZE))
722 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
723 }
724
725 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
726 int rc = __skey_check_enable(vcpu);
727
728 if (rc)
729 return rc;
730 if (set_guest_storage_key(current->mm, useraddr,
731 vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
732 vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
733 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
734 }
735
736 start += PAGE_SIZE;
737 }
738 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
739 vcpu->run->s.regs.gprs[reg2] = end;
740 return 0;
741}
742
743static int handle_essa(struct kvm_vcpu *vcpu)
744{
745 /* entries expected to be 1FF */
746 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
747 unsigned long *cbrlo, cbrle;
748 struct gmap *gmap;
749 int i;
750
751 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
752 gmap = vcpu->arch.gmap;
753 vcpu->stat.instruction_essa++;
754 if (!vcpu->kvm->arch.use_cmma)
755 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
756
757 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
758 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
759
760 if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
761 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
762
763 /* Retry the ESSA instruction */
764 kvm_s390_retry_instr(vcpu);
765 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
766 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
767 down_read(&gmap->mm->mmap_sem);
768 for (i = 0; i < entries; ++i) {
769 cbrle = cbrlo[i];
770 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
771 /* invalid entry */
772 break;
773 /* try to free backing */
774 __gmap_zap(gmap, cbrle);
775 }
776 up_read(&gmap->mm->mmap_sem);
777 if (i < entries)
778 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
779 return 0;
780}
781
782static const intercept_handler_t b9_handlers[256] = {
783 [0x8a] = handle_ipte_interlock,
784 [0x8d] = handle_epsw,
785 [0x8e] = handle_ipte_interlock,
786 [0x8f] = handle_ipte_interlock,
787 [0xab] = handle_essa,
788 [0xaf] = handle_pfmf,
789};
790
791int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
792{
793 intercept_handler_t handler;
794
795 /* This is handled just as for the B2 instructions. */
796 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
797 if (handler)
798 return handler(vcpu);
799
800 return -EOPNOTSUPP;
801}
802
803int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
804{
805 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
806 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
807 int reg, rc, nr_regs;
808 u32 ctl_array[16];
809 u64 ga;
810 ar_t ar;
811
812 vcpu->stat.instruction_lctl++;
813
814 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
815 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
816
817 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
818
819 if (ga & 3)
820 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
821
822 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
823 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
824
825 nr_regs = ((reg3 - reg1) & 0xf) + 1;
826 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
827 if (rc)
828 return kvm_s390_inject_prog_cond(vcpu, rc);
829 reg = reg1;
830 nr_regs = 0;
831 do {
832 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
833 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
834 if (reg == reg3)
835 break;
836 reg = (reg + 1) % 16;
837 } while (1);
838 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
839 return 0;
840}
841
842int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
843{
844 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
845 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
846 int reg, rc, nr_regs;
847 u32 ctl_array[16];
848 u64 ga;
849 ar_t ar;
850
851 vcpu->stat.instruction_stctl++;
852
853 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
854 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
855
856 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
857
858 if (ga & 3)
859 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
860
861 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
862 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
863
864 reg = reg1;
865 nr_regs = 0;
866 do {
867 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
868 if (reg == reg3)
869 break;
870 reg = (reg + 1) % 16;
871 } while (1);
872 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
873 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
874}
875
876static int handle_lctlg(struct kvm_vcpu *vcpu)
877{
878 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
879 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
880 int reg, rc, nr_regs;
881 u64 ctl_array[16];
882 u64 ga;
883 ar_t ar;
884
885 vcpu->stat.instruction_lctlg++;
886
887 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
888 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
889
890 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
891
892 if (ga & 7)
893 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
894
895 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
896 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
897
898 nr_regs = ((reg3 - reg1) & 0xf) + 1;
899 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
900 if (rc)
901 return kvm_s390_inject_prog_cond(vcpu, rc);
902 reg = reg1;
903 nr_regs = 0;
904 do {
905 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
906 if (reg == reg3)
907 break;
908 reg = (reg + 1) % 16;
909 } while (1);
910 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
911 return 0;
912}
913
914static int handle_stctg(struct kvm_vcpu *vcpu)
915{
916 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
917 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
918 int reg, rc, nr_regs;
919 u64 ctl_array[16];
920 u64 ga;
921 ar_t ar;
922
923 vcpu->stat.instruction_stctg++;
924
925 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
926 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
927
928 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
929
930 if (ga & 7)
931 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
932
933 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
934 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
935
936 reg = reg1;
937 nr_regs = 0;
938 do {
939 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
940 if (reg == reg3)
941 break;
942 reg = (reg + 1) % 16;
943 } while (1);
944 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
945 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
946}
947
948static const intercept_handler_t eb_handlers[256] = {
949 [0x2f] = handle_lctlg,
950 [0x25] = handle_stctg,
951};
952
953int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
954{
955 intercept_handler_t handler;
956
957 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
958 if (handler)
959 return handler(vcpu);
960 return -EOPNOTSUPP;
961}
962
963static int handle_tprot(struct kvm_vcpu *vcpu)
964{
965 u64 address1, address2;
966 unsigned long hva, gpa;
967 int ret = 0, cc = 0;
968 bool writable;
969 ar_t ar;
970
971 vcpu->stat.instruction_tprot++;
972
973 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
974 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
975
976 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
977
978 /* we only handle the Linux memory detection case:
979 * access key == 0
980 * everything else goes to userspace. */
981 if (address2 & 0xf0)
982 return -EOPNOTSUPP;
983 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
984 ipte_lock(vcpu);
985 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
986 if (ret == PGM_PROTECTION) {
987 /* Write protected? Try again with read-only... */
988 cc = 1;
989 ret = guest_translate_address(vcpu, address1, ar, &gpa,
990 GACC_FETCH);
991 }
992 if (ret) {
993 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
994 ret = kvm_s390_inject_program_int(vcpu, ret);
995 } else if (ret > 0) {
996 /* Translation not available */
997 kvm_s390_set_psw_cc(vcpu, 3);
998 ret = 0;
999 }
1000 goto out_unlock;
1001 }
1002
1003 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1004 if (kvm_is_error_hva(hva)) {
1005 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1006 } else {
1007 if (!writable)
1008 cc = 1; /* Write not permitted ==> read-only */
1009 kvm_s390_set_psw_cc(vcpu, cc);
1010 /* Note: CC2 only occurs for storage keys (not supported yet) */
1011 }
1012out_unlock:
1013 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1014 ipte_unlock(vcpu);
1015 return ret;
1016}
1017
1018int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1019{
1020 /* For e5xx... instructions we only handle TPROT */
1021 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1022 return handle_tprot(vcpu);
1023 return -EOPNOTSUPP;
1024}
1025
1026static int handle_sckpf(struct kvm_vcpu *vcpu)
1027{
1028 u32 value;
1029
1030 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1031 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1032
1033 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1034 return kvm_s390_inject_program_int(vcpu,
1035 PGM_SPECIFICATION);
1036
1037 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1038 vcpu->arch.sie_block->todpr = value;
1039
1040 return 0;
1041}
1042
1043static const intercept_handler_t x01_handlers[256] = {
1044 [0x07] = handle_sckpf,
1045};
1046
1047int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1048{
1049 intercept_handler_t handler;
1050
1051 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1052 if (handler)
1053 return handler(vcpu);
1054 return -EOPNOTSUPP;
1055}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * handling privileged instructions
4 *
5 * Copyright IBM Corp. 2008, 2020
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 */
10
11#include <linux/kvm.h>
12#include <linux/gfp.h>
13#include <linux/errno.h>
14#include <linux/mm_types.h>
15#include <linux/pgtable.h>
16#include <linux/io.h>
17#include <asm/asm-offsets.h>
18#include <asm/facility.h>
19#include <asm/current.h>
20#include <asm/debug.h>
21#include <asm/ebcdic.h>
22#include <asm/sysinfo.h>
23#include <asm/page-states.h>
24#include <asm/gmap.h>
25#include <asm/ptrace.h>
26#include <asm/sclp.h>
27#include <asm/ap.h>
28#include "gaccess.h"
29#include "kvm-s390.h"
30#include "trace.h"
31
32static int handle_ri(struct kvm_vcpu *vcpu)
33{
34 vcpu->stat.instruction_ri++;
35
36 if (test_kvm_facility(vcpu->kvm, 64)) {
37 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
38 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
39 kvm_s390_retry_instr(vcpu);
40 return 0;
41 } else
42 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
43}
44
45int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
46{
47 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
48 return handle_ri(vcpu);
49 else
50 return -EOPNOTSUPP;
51}
52
53static int handle_gs(struct kvm_vcpu *vcpu)
54{
55 vcpu->stat.instruction_gs++;
56
57 if (test_kvm_facility(vcpu->kvm, 133)) {
58 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
59 preempt_disable();
60 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
61 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
62 restore_gs_cb(current->thread.gs_cb);
63 preempt_enable();
64 vcpu->arch.sie_block->ecb |= ECB_GS;
65 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
66 vcpu->arch.gs_enabled = 1;
67 kvm_s390_retry_instr(vcpu);
68 return 0;
69 } else
70 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
71}
72
73int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
74{
75 int code = vcpu->arch.sie_block->ipb & 0xff;
76
77 if (code == 0x49 || code == 0x4d)
78 return handle_gs(vcpu);
79 else
80 return -EOPNOTSUPP;
81}
82/* Handle SCK (SET CLOCK) interception */
83static int handle_set_clock(struct kvm_vcpu *vcpu)
84{
85 struct kvm_s390_vm_tod_clock gtod = { 0 };
86 int rc;
87 u8 ar;
88 u64 op2;
89
90 vcpu->stat.instruction_sck++;
91
92 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
93 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
94
95 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
96 if (op2 & 7) /* Operand must be on a doubleword boundary */
97 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
98 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
99 if (rc)
100 return kvm_s390_inject_prog_cond(vcpu, rc);
101
102 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
103 /*
104 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
105 * is already held in handle_set_clock. The usual lock order is the
106 * opposite. As SCK is deprecated and should not be used in several
107 * cases, for example when the multiple epoch facility or TOD clock
108 * steering facility is installed (see Principles of Operation), a
109 * slow path can be used. If the lock can not be taken via try_lock,
110 * the instruction will be retried via -EAGAIN at a later point in
111 * time.
112 */
113 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
114 kvm_s390_retry_instr(vcpu);
115 return -EAGAIN;
116 }
117
118 kvm_s390_set_psw_cc(vcpu, 0);
119 return 0;
120}
121
122static int handle_set_prefix(struct kvm_vcpu *vcpu)
123{
124 u64 operand2;
125 u32 address;
126 int rc;
127 u8 ar;
128
129 vcpu->stat.instruction_spx++;
130
131 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
132 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
133
134 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
135
136 /* must be word boundary */
137 if (operand2 & 3)
138 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
139
140 /* get the value */
141 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
142 if (rc)
143 return kvm_s390_inject_prog_cond(vcpu, rc);
144
145 address &= 0x7fffe000u;
146
147 /*
148 * Make sure the new value is valid memory. We only need to check the
149 * first page, since address is 8k aligned and memory pieces are always
150 * at least 1MB aligned and have at least a size of 1MB.
151 */
152 if (!kvm_is_gpa_in_memslot(vcpu->kvm, address))
153 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
154
155 kvm_s390_set_prefix(vcpu, address);
156 trace_kvm_s390_handle_prefix(vcpu, 1, address);
157 return 0;
158}
159
160static int handle_store_prefix(struct kvm_vcpu *vcpu)
161{
162 u64 operand2;
163 u32 address;
164 int rc;
165 u8 ar;
166
167 vcpu->stat.instruction_stpx++;
168
169 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
170 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
171
172 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
173
174 /* must be word boundary */
175 if (operand2 & 3)
176 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
177
178 address = kvm_s390_get_prefix(vcpu);
179
180 /* get the value */
181 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
182 if (rc)
183 return kvm_s390_inject_prog_cond(vcpu, rc);
184
185 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
186 trace_kvm_s390_handle_prefix(vcpu, 0, address);
187 return 0;
188}
189
190static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
191{
192 u16 vcpu_id = vcpu->vcpu_id;
193 u64 ga;
194 int rc;
195 u8 ar;
196
197 vcpu->stat.instruction_stap++;
198
199 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
200 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
201
202 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
203
204 if (ga & 1)
205 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
206
207 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
208 if (rc)
209 return kvm_s390_inject_prog_cond(vcpu, rc);
210
211 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
212 trace_kvm_s390_handle_stap(vcpu, ga);
213 return 0;
214}
215
216int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
217{
218 int rc;
219
220 trace_kvm_s390_skey_related_inst(vcpu);
221 /* Already enabled? */
222 if (vcpu->arch.skey_enabled)
223 return 0;
224
225 rc = s390_enable_skey();
226 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
227 if (rc)
228 return rc;
229
230 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
231 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
232 if (!vcpu->kvm->arch.use_skf)
233 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
234 else
235 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
236 vcpu->arch.skey_enabled = true;
237 return 0;
238}
239
240static int try_handle_skey(struct kvm_vcpu *vcpu)
241{
242 int rc;
243
244 rc = kvm_s390_skey_check_enable(vcpu);
245 if (rc)
246 return rc;
247 if (vcpu->kvm->arch.use_skf) {
248 /* with storage-key facility, SIE interprets it for us */
249 kvm_s390_retry_instr(vcpu);
250 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
251 return -EAGAIN;
252 }
253 return 0;
254}
255
256static int handle_iske(struct kvm_vcpu *vcpu)
257{
258 unsigned long gaddr, vmaddr;
259 unsigned char key;
260 int reg1, reg2;
261 bool unlocked;
262 int rc;
263
264 vcpu->stat.instruction_iske++;
265
266 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
267 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
268
269 rc = try_handle_skey(vcpu);
270 if (rc)
271 return rc != -EAGAIN ? rc : 0;
272
273 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
274
275 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
276 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
277 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
278 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
279 if (kvm_is_error_hva(vmaddr))
280 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
281retry:
282 unlocked = false;
283 mmap_read_lock(current->mm);
284 rc = get_guest_storage_key(current->mm, vmaddr, &key);
285
286 if (rc) {
287 rc = fixup_user_fault(current->mm, vmaddr,
288 FAULT_FLAG_WRITE, &unlocked);
289 if (!rc) {
290 mmap_read_unlock(current->mm);
291 goto retry;
292 }
293 }
294 mmap_read_unlock(current->mm);
295 if (rc == -EFAULT)
296 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
297 if (rc < 0)
298 return rc;
299 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
300 vcpu->run->s.regs.gprs[reg1] |= key;
301 return 0;
302}
303
304static int handle_rrbe(struct kvm_vcpu *vcpu)
305{
306 unsigned long vmaddr, gaddr;
307 int reg1, reg2;
308 bool unlocked;
309 int rc;
310
311 vcpu->stat.instruction_rrbe++;
312
313 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
314 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
315
316 rc = try_handle_skey(vcpu);
317 if (rc)
318 return rc != -EAGAIN ? rc : 0;
319
320 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
321
322 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
323 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
324 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
325 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
326 if (kvm_is_error_hva(vmaddr))
327 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
328retry:
329 unlocked = false;
330 mmap_read_lock(current->mm);
331 rc = reset_guest_reference_bit(current->mm, vmaddr);
332 if (rc < 0) {
333 rc = fixup_user_fault(current->mm, vmaddr,
334 FAULT_FLAG_WRITE, &unlocked);
335 if (!rc) {
336 mmap_read_unlock(current->mm);
337 goto retry;
338 }
339 }
340 mmap_read_unlock(current->mm);
341 if (rc == -EFAULT)
342 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
343 if (rc < 0)
344 return rc;
345 kvm_s390_set_psw_cc(vcpu, rc);
346 return 0;
347}
348
349#define SSKE_NQ 0x8
350#define SSKE_MR 0x4
351#define SSKE_MC 0x2
352#define SSKE_MB 0x1
353static int handle_sske(struct kvm_vcpu *vcpu)
354{
355 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
356 unsigned long start, end;
357 unsigned char key, oldkey;
358 int reg1, reg2;
359 bool unlocked;
360 int rc;
361
362 vcpu->stat.instruction_sske++;
363
364 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
365 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
366
367 rc = try_handle_skey(vcpu);
368 if (rc)
369 return rc != -EAGAIN ? rc : 0;
370
371 if (!test_kvm_facility(vcpu->kvm, 8))
372 m3 &= ~SSKE_MB;
373 if (!test_kvm_facility(vcpu->kvm, 10))
374 m3 &= ~(SSKE_MC | SSKE_MR);
375 if (!test_kvm_facility(vcpu->kvm, 14))
376 m3 &= ~SSKE_NQ;
377
378 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
379
380 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
381 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
382 start = kvm_s390_logical_to_effective(vcpu, start);
383 if (m3 & SSKE_MB) {
384 /* start already designates an absolute address */
385 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
386 } else {
387 start = kvm_s390_real_to_abs(vcpu, start);
388 end = start + PAGE_SIZE;
389 }
390
391 while (start != end) {
392 unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
393 unlocked = false;
394
395 if (kvm_is_error_hva(vmaddr))
396 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
397
398 mmap_read_lock(current->mm);
399 rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
400 m3 & SSKE_NQ, m3 & SSKE_MR,
401 m3 & SSKE_MC);
402
403 if (rc < 0) {
404 rc = fixup_user_fault(current->mm, vmaddr,
405 FAULT_FLAG_WRITE, &unlocked);
406 rc = !rc ? -EAGAIN : rc;
407 }
408 mmap_read_unlock(current->mm);
409 if (rc == -EFAULT)
410 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
411 if (rc == -EAGAIN)
412 continue;
413 if (rc < 0)
414 return rc;
415 start += PAGE_SIZE;
416 }
417
418 if (m3 & (SSKE_MC | SSKE_MR)) {
419 if (m3 & SSKE_MB) {
420 /* skey in reg1 is unpredictable */
421 kvm_s390_set_psw_cc(vcpu, 3);
422 } else {
423 kvm_s390_set_psw_cc(vcpu, rc);
424 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
425 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
426 }
427 }
428 if (m3 & SSKE_MB) {
429 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
430 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
431 else
432 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
433 end = kvm_s390_logical_to_effective(vcpu, end);
434 vcpu->run->s.regs.gprs[reg2] |= end;
435 }
436 return 0;
437}
438
439static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
440{
441 vcpu->stat.instruction_ipte_interlock++;
442 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
443 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
444 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
445 kvm_s390_retry_instr(vcpu);
446 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
447 return 0;
448}
449
450static int handle_test_block(struct kvm_vcpu *vcpu)
451{
452 gpa_t addr;
453 int reg2;
454
455 vcpu->stat.instruction_tb++;
456
457 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
458 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
459
460 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
461 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
462 addr = kvm_s390_logical_to_effective(vcpu, addr);
463 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
464 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
465 addr = kvm_s390_real_to_abs(vcpu, addr);
466
467 if (!kvm_is_gpa_in_memslot(vcpu->kvm, addr))
468 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
469 /*
470 * We don't expect errors on modern systems, and do not care
471 * about storage keys (yet), so let's just clear the page.
472 */
473 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
474 return -EFAULT;
475 kvm_s390_set_psw_cc(vcpu, 0);
476 vcpu->run->s.regs.gprs[0] = 0;
477 return 0;
478}
479
480static int handle_tpi(struct kvm_vcpu *vcpu)
481{
482 struct kvm_s390_interrupt_info *inti;
483 unsigned long len;
484 u32 tpi_data[3];
485 int rc;
486 u64 addr;
487 u8 ar;
488
489 vcpu->stat.instruction_tpi++;
490
491 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
492 if (addr & 3)
493 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
494
495 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
496 if (!inti) {
497 kvm_s390_set_psw_cc(vcpu, 0);
498 return 0;
499 }
500
501 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
502 tpi_data[1] = inti->io.io_int_parm;
503 tpi_data[2] = inti->io.io_int_word;
504 if (addr) {
505 /*
506 * Store the two-word I/O interruption code into the
507 * provided area.
508 */
509 len = sizeof(tpi_data) - 4;
510 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
511 if (rc) {
512 rc = kvm_s390_inject_prog_cond(vcpu, rc);
513 goto reinject_interrupt;
514 }
515 } else {
516 /*
517 * Store the three-word I/O interruption code into
518 * the appropriate lowcore area.
519 */
520 len = sizeof(tpi_data);
521 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
522 /* failed writes to the low core are not recoverable */
523 rc = -EFAULT;
524 goto reinject_interrupt;
525 }
526 }
527
528 /* irq was successfully handed to the guest */
529 kfree(inti);
530 kvm_s390_set_psw_cc(vcpu, 1);
531 return 0;
532reinject_interrupt:
533 /*
534 * If we encounter a problem storing the interruption code, the
535 * instruction is suppressed from the guest's view: reinject the
536 * interrupt.
537 */
538 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
539 kfree(inti);
540 rc = -EFAULT;
541 }
542 /* don't set the cc, a pgm irq was injected or we drop to user space */
543 return rc ? -EFAULT : 0;
544}
545
546static int handle_tsch(struct kvm_vcpu *vcpu)
547{
548 struct kvm_s390_interrupt_info *inti = NULL;
549 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
550
551 vcpu->stat.instruction_tsch++;
552
553 /* a valid schid has at least one bit set */
554 if (vcpu->run->s.regs.gprs[1])
555 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
556 vcpu->run->s.regs.gprs[1]);
557
558 /*
559 * Prepare exit to userspace.
560 * We indicate whether we dequeued a pending I/O interrupt
561 * so that userspace can re-inject it if the instruction gets
562 * a program check. While this may re-order the pending I/O
563 * interrupts, this is no problem since the priority is kept
564 * intact.
565 */
566 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
567 vcpu->run->s390_tsch.dequeued = !!inti;
568 if (inti) {
569 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
570 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
571 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
572 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
573 }
574 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
575 kfree(inti);
576 return -EREMOTE;
577}
578
579static int handle_io_inst(struct kvm_vcpu *vcpu)
580{
581 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
582
583 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
584 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
585
586 if (vcpu->kvm->arch.css_support) {
587 /*
588 * Most I/O instructions will be handled by userspace.
589 * Exceptions are tpi and the interrupt portion of tsch.
590 */
591 if (vcpu->arch.sie_block->ipa == 0xb236)
592 return handle_tpi(vcpu);
593 if (vcpu->arch.sie_block->ipa == 0xb235)
594 return handle_tsch(vcpu);
595 /* Handle in userspace. */
596 vcpu->stat.instruction_io_other++;
597 return -EOPNOTSUPP;
598 } else {
599 /*
600 * Set condition code 3 to stop the guest from issuing channel
601 * I/O instructions.
602 */
603 kvm_s390_set_psw_cc(vcpu, 3);
604 return 0;
605 }
606}
607
608/*
609 * handle_pqap: Handling pqap interception
610 * @vcpu: the vcpu having issue the pqap instruction
611 *
612 * We now support PQAP/AQIC instructions and we need to correctly
613 * answer the guest even if no dedicated driver's hook is available.
614 *
615 * The intercepting code calls a dedicated callback for this instruction
616 * if a driver did register one in the CRYPTO satellite of the
617 * SIE block.
618 *
619 * If no callback is available, the queues are not available, return this
620 * response code to the caller and set CC to 3.
621 * Else return the response code returned by the callback.
622 */
623static int handle_pqap(struct kvm_vcpu *vcpu)
624{
625 struct ap_queue_status status = {};
626 crypto_hook pqap_hook;
627 unsigned long reg0;
628 int ret;
629 uint8_t fc;
630
631 /* Verify that the AP instruction are available */
632 if (!ap_instructions_available())
633 return -EOPNOTSUPP;
634 /* Verify that the guest is allowed to use AP instructions */
635 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
636 return -EOPNOTSUPP;
637 /*
638 * The only possibly intercepted functions when AP instructions are
639 * available for the guest are AQIC and TAPQ with the t bit set
640 * since we do not set IC.3 (FIII) we currently will only intercept
641 * the AQIC function code.
642 * Note: running nested under z/VM can result in intercepts for other
643 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
644 */
645 reg0 = vcpu->run->s.regs.gprs[0];
646 fc = (reg0 >> 24) & 0xff;
647 if (fc != 0x03)
648 return -EOPNOTSUPP;
649
650 /* PQAP instruction is allowed for guest kernel only */
651 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
652 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
653
654 /* Common PQAP instruction specification exceptions */
655 /* bits 41-47 must all be zeros */
656 if (reg0 & 0x007f0000UL)
657 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
658 /* APFT not install and T bit set */
659 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
660 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
661 /* APXA not installed and APID greater 64 or APQI greater 16 */
662 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
663 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
664
665 /* AQIC function code specific exception */
666 /* facility 65 not present for AQIC function code */
667 if (!test_kvm_facility(vcpu->kvm, 65))
668 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
669
670 /*
671 * If the hook callback is registered, there will be a pointer to the
672 * hook function pointer in the kvm_s390_crypto structure. Lock the
673 * owner, retrieve the hook function pointer and call the hook.
674 */
675 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
676 if (vcpu->kvm->arch.crypto.pqap_hook) {
677 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
678 ret = pqap_hook(vcpu);
679 if (!ret) {
680 if (vcpu->run->s.regs.gprs[1] & 0x00ff0000)
681 kvm_s390_set_psw_cc(vcpu, 3);
682 else
683 kvm_s390_set_psw_cc(vcpu, 0);
684 }
685 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
686 return ret;
687 }
688 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
689 /*
690 * A vfio_driver must register a hook.
691 * No hook means no driver to enable the SIE CRYCB and no queues.
692 * We send this response to the guest.
693 */
694 status.response_code = 0x01;
695 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
696 kvm_s390_set_psw_cc(vcpu, 3);
697 return 0;
698}
699
700static int handle_stfl(struct kvm_vcpu *vcpu)
701{
702 int rc;
703 unsigned int fac;
704
705 vcpu->stat.instruction_stfl++;
706
707 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
708 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
709
710 /*
711 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
712 * into a u32 memory representation. They will remain bits 0-31.
713 */
714 fac = *vcpu->kvm->arch.model.fac_list >> 32;
715 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
716 &fac, sizeof(fac));
717 if (rc)
718 return rc;
719 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
720 trace_kvm_s390_handle_stfl(vcpu, fac);
721 return 0;
722}
723
724#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
725#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
726#define PSW_ADDR_24 0x0000000000ffffffUL
727#define PSW_ADDR_31 0x000000007fffffffUL
728
729int is_valid_psw(psw_t *psw)
730{
731 if (psw->mask & PSW_MASK_UNASSIGNED)
732 return 0;
733 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
734 if (psw->addr & ~PSW_ADDR_31)
735 return 0;
736 }
737 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
738 return 0;
739 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
740 return 0;
741 if (psw->addr & 1)
742 return 0;
743 return 1;
744}
745
746int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
747{
748 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
749 psw_compat_t new_psw;
750 u64 addr;
751 int rc;
752 u8 ar;
753
754 vcpu->stat.instruction_lpsw++;
755
756 if (gpsw->mask & PSW_MASK_PSTATE)
757 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
758
759 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
760 if (addr & 7)
761 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
762
763 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
764 if (rc)
765 return kvm_s390_inject_prog_cond(vcpu, rc);
766 if (!(new_psw.mask & PSW32_MASK_BASE))
767 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
768 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
769 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
770 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
771 if (!is_valid_psw(gpsw))
772 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
773 return 0;
774}
775
776static int handle_lpswe(struct kvm_vcpu *vcpu)
777{
778 psw_t new_psw;
779 u64 addr;
780 int rc;
781 u8 ar;
782
783 vcpu->stat.instruction_lpswe++;
784
785 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
786 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
787
788 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
789 if (addr & 7)
790 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
791 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
792 if (rc)
793 return kvm_s390_inject_prog_cond(vcpu, rc);
794 vcpu->arch.sie_block->gpsw = new_psw;
795 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
796 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
797 return 0;
798}
799
800static int handle_stidp(struct kvm_vcpu *vcpu)
801{
802 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
803 u64 operand2;
804 int rc;
805 u8 ar;
806
807 vcpu->stat.instruction_stidp++;
808
809 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
810 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
811
812 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
813
814 if (operand2 & 7)
815 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
816
817 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
818 if (rc)
819 return kvm_s390_inject_prog_cond(vcpu, rc);
820
821 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
822 return 0;
823}
824
825static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
826{
827 int cpus = 0;
828 int n;
829
830 cpus = atomic_read(&vcpu->kvm->online_vcpus);
831
832 /* deal with other level 3 hypervisors */
833 if (stsi(mem, 3, 2, 2))
834 mem->count = 0;
835 if (mem->count < 8)
836 mem->count++;
837 for (n = mem->count - 1; n > 0 ; n--)
838 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
839
840 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
841 mem->vm[0].cpus_total = cpus;
842 mem->vm[0].cpus_configured = cpus;
843 mem->vm[0].cpus_standby = 0;
844 mem->vm[0].cpus_reserved = 0;
845 mem->vm[0].caf = 1000;
846 memcpy(mem->vm[0].name, "KVMguest", 8);
847 ASCEBC(mem->vm[0].name, 8);
848 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
849 ASCEBC(mem->vm[0].cpi, 16);
850}
851
852static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
853 u8 fc, u8 sel1, u16 sel2)
854{
855 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
856 vcpu->run->s390_stsi.addr = addr;
857 vcpu->run->s390_stsi.ar = ar;
858 vcpu->run->s390_stsi.fc = fc;
859 vcpu->run->s390_stsi.sel1 = sel1;
860 vcpu->run->s390_stsi.sel2 = sel2;
861}
862
863static int handle_stsi(struct kvm_vcpu *vcpu)
864{
865 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
866 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
867 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
868 unsigned long mem = 0;
869 u64 operand2;
870 int rc = 0;
871 u8 ar;
872
873 vcpu->stat.instruction_stsi++;
874 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
875
876 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
877 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
878
879 /* Bailout forbidden function codes */
880 if (fc > 3 && fc != 15)
881 goto out_no_data;
882
883 /*
884 * fc 15 is provided only with
885 * - PTF/CPU topology support through facility 15
886 * - KVM_CAP_S390_USER_STSI
887 */
888 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
889 !vcpu->kvm->arch.user_stsi))
890 goto out_no_data;
891
892 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
893 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
894 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
895
896 if (fc == 0) {
897 vcpu->run->s.regs.gprs[0] = 3 << 28;
898 kvm_s390_set_psw_cc(vcpu, 0);
899 return 0;
900 }
901
902 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
903
904 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
905 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
906
907 switch (fc) {
908 case 1: /* same handling for 1 and 2 */
909 case 2:
910 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
911 if (!mem)
912 goto out_no_data;
913 if (stsi((void *) mem, fc, sel1, sel2))
914 goto out_no_data;
915 break;
916 case 3:
917 if (sel1 != 2 || sel2 != 2)
918 goto out_no_data;
919 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
920 if (!mem)
921 goto out_no_data;
922 handle_stsi_3_2_2(vcpu, (void *) mem);
923 break;
924 case 15: /* fc 15 is fully handled in userspace */
925 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
926 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
927 return -EREMOTE;
928 }
929 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
930 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
931 rc = 0;
932 } else {
933 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
934 }
935 if (rc) {
936 rc = kvm_s390_inject_prog_cond(vcpu, rc);
937 goto out;
938 }
939 if (vcpu->kvm->arch.user_stsi) {
940 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
941 rc = -EREMOTE;
942 }
943 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
944 free_page(mem);
945 kvm_s390_set_psw_cc(vcpu, 0);
946 vcpu->run->s.regs.gprs[0] = 0;
947 return rc;
948out_no_data:
949 kvm_s390_set_psw_cc(vcpu, 3);
950out:
951 free_page(mem);
952 return rc;
953}
954
955int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
956{
957 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
958 case 0x02:
959 return handle_stidp(vcpu);
960 case 0x04:
961 return handle_set_clock(vcpu);
962 case 0x10:
963 return handle_set_prefix(vcpu);
964 case 0x11:
965 return handle_store_prefix(vcpu);
966 case 0x12:
967 return handle_store_cpu_address(vcpu);
968 case 0x14:
969 return kvm_s390_handle_vsie(vcpu);
970 case 0x21:
971 case 0x50:
972 return handle_ipte_interlock(vcpu);
973 case 0x29:
974 return handle_iske(vcpu);
975 case 0x2a:
976 return handle_rrbe(vcpu);
977 case 0x2b:
978 return handle_sske(vcpu);
979 case 0x2c:
980 return handle_test_block(vcpu);
981 case 0x30:
982 case 0x31:
983 case 0x32:
984 case 0x33:
985 case 0x34:
986 case 0x35:
987 case 0x36:
988 case 0x37:
989 case 0x38:
990 case 0x39:
991 case 0x3a:
992 case 0x3b:
993 case 0x3c:
994 case 0x5f:
995 case 0x74:
996 case 0x76:
997 return handle_io_inst(vcpu);
998 case 0x56:
999 return handle_sthyi(vcpu);
1000 case 0x7d:
1001 return handle_stsi(vcpu);
1002 case 0xaf:
1003 return handle_pqap(vcpu);
1004 case 0xb1:
1005 return handle_stfl(vcpu);
1006 case 0xb2:
1007 return handle_lpswe(vcpu);
1008 default:
1009 return -EOPNOTSUPP;
1010 }
1011}
1012
1013static int handle_epsw(struct kvm_vcpu *vcpu)
1014{
1015 int reg1, reg2;
1016
1017 vcpu->stat.instruction_epsw++;
1018
1019 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1020
1021 /* This basically extracts the mask half of the psw. */
1022 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1023 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1024 if (reg2) {
1025 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1026 vcpu->run->s.regs.gprs[reg2] |=
1027 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1028 }
1029 return 0;
1030}
1031
1032#define PFMF_RESERVED 0xfffc0101UL
1033#define PFMF_SK 0x00020000UL
1034#define PFMF_CF 0x00010000UL
1035#define PFMF_UI 0x00008000UL
1036#define PFMF_FSC 0x00007000UL
1037#define PFMF_NQ 0x00000800UL
1038#define PFMF_MR 0x00000400UL
1039#define PFMF_MC 0x00000200UL
1040#define PFMF_KEY 0x000000feUL
1041
1042static int handle_pfmf(struct kvm_vcpu *vcpu)
1043{
1044 bool mr = false, mc = false, nq;
1045 int reg1, reg2;
1046 unsigned long start, end;
1047 unsigned char key;
1048
1049 vcpu->stat.instruction_pfmf++;
1050
1051 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1052
1053 if (!test_kvm_facility(vcpu->kvm, 8))
1054 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1055
1056 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1057 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1058
1059 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1060 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1061
1062 /* Only provide non-quiescing support if enabled for the guest */
1063 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1064 !test_kvm_facility(vcpu->kvm, 14))
1065 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1066
1067 /* Only provide conditional-SSKE support if enabled for the guest */
1068 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1069 test_kvm_facility(vcpu->kvm, 10)) {
1070 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1071 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1072 }
1073
1074 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1075 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1076 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1077 start = kvm_s390_logical_to_effective(vcpu, start);
1078
1079 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1080 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1081 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1082 }
1083
1084 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1085 case 0x00000000:
1086 /* only 4k frames specify a real address */
1087 start = kvm_s390_real_to_abs(vcpu, start);
1088 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1089 break;
1090 case 0x00001000:
1091 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1092 break;
1093 case 0x00002000:
1094 /* only support 2G frame size if EDAT2 is available and we are
1095 not in 24-bit addressing mode */
1096 if (!test_kvm_facility(vcpu->kvm, 78) ||
1097 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1098 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1099 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1100 break;
1101 default:
1102 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1103 }
1104
1105 while (start != end) {
1106 unsigned long vmaddr;
1107 bool unlocked = false;
1108
1109 /* Translate guest address to host address */
1110 vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
1111 if (kvm_is_error_hva(vmaddr))
1112 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1113
1114 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1115 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1116 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1117 }
1118
1119 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1120 int rc = kvm_s390_skey_check_enable(vcpu);
1121
1122 if (rc)
1123 return rc;
1124 mmap_read_lock(current->mm);
1125 rc = cond_set_guest_storage_key(current->mm, vmaddr,
1126 key, NULL, nq, mr, mc);
1127 if (rc < 0) {
1128 rc = fixup_user_fault(current->mm, vmaddr,
1129 FAULT_FLAG_WRITE, &unlocked);
1130 rc = !rc ? -EAGAIN : rc;
1131 }
1132 mmap_read_unlock(current->mm);
1133 if (rc == -EFAULT)
1134 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1135 if (rc == -EAGAIN)
1136 continue;
1137 if (rc < 0)
1138 return rc;
1139 }
1140 start += PAGE_SIZE;
1141 }
1142 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1143 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1144 vcpu->run->s.regs.gprs[reg2] = end;
1145 } else {
1146 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1147 end = kvm_s390_logical_to_effective(vcpu, end);
1148 vcpu->run->s.regs.gprs[reg2] |= end;
1149 }
1150 }
1151 return 0;
1152}
1153
1154/*
1155 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1156 */
1157static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1158{
1159 int r1, r2, nappended, entries;
1160 unsigned long gfn, hva, res, pgstev, ptev;
1161 unsigned long *cbrlo;
1162
1163 /*
1164 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1165 * machine check here we either handle it or crash
1166 */
1167
1168 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1169 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1170 hva = gfn_to_hva(vcpu->kvm, gfn);
1171 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1172
1173 if (kvm_is_error_hva(hva))
1174 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1175
1176 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1177 if (nappended < 0) {
1178 res = orc ? 0x10 : 0;
1179 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1180 return 0;
1181 }
1182 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1183 /*
1184 * Set the block-content state part of the result. 0 means resident, so
1185 * nothing to do if the page is valid. 2 is for preserved pages
1186 * (non-present and non-zero), and 3 for zero pages (non-present and
1187 * zero).
1188 */
1189 if (ptev & _PAGE_INVALID) {
1190 res |= 2;
1191 if (pgstev & _PGSTE_GPS_ZERO)
1192 res |= 1;
1193 }
1194 if (pgstev & _PGSTE_GPS_NODAT)
1195 res |= 0x20;
1196 vcpu->run->s.regs.gprs[r1] = res;
1197 /*
1198 * It is possible that all the normal 511 slots were full, in which case
1199 * we will now write in the 512th slot, which is reserved for host use.
1200 * In both cases we let the normal essa handling code process all the
1201 * slots, including the reserved one, if needed.
1202 */
1203 if (nappended > 0) {
1204 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1205 cbrlo[entries] = gfn << PAGE_SHIFT;
1206 }
1207
1208 if (orc) {
1209 struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
1210
1211 /* Increment only if we are really flipping the bit */
1212 if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
1213 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1214 }
1215
1216 return nappended;
1217}
1218
1219static int handle_essa(struct kvm_vcpu *vcpu)
1220{
1221 /* entries expected to be 1FF */
1222 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1223 unsigned long *cbrlo;
1224 struct gmap *gmap;
1225 int i, orc;
1226
1227 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1228 gmap = vcpu->arch.gmap;
1229 vcpu->stat.instruction_essa++;
1230 if (!vcpu->kvm->arch.use_cmma)
1231 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1232
1233 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1234 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1235 /* Check for invalid operation request code */
1236 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1237 /* ORCs 0-6 are always valid */
1238 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1239 : ESSA_SET_STABLE_IF_RESIDENT))
1240 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1241
1242 if (!vcpu->kvm->arch.migration_mode) {
1243 /*
1244 * CMMA is enabled in the KVM settings, but is disabled in
1245 * the SIE block and in the mm_context, and we are not doing
1246 * a migration. Enable CMMA in the mm_context.
1247 * Since we need to take a write lock to write to the context
1248 * to avoid races with storage keys handling, we check if the
1249 * value really needs to be written to; if the value is
1250 * already correct, we do nothing and avoid the lock.
1251 */
1252 if (vcpu->kvm->mm->context.uses_cmm == 0) {
1253 mmap_write_lock(vcpu->kvm->mm);
1254 vcpu->kvm->mm->context.uses_cmm = 1;
1255 mmap_write_unlock(vcpu->kvm->mm);
1256 }
1257 /*
1258 * If we are here, we are supposed to have CMMA enabled in
1259 * the SIE block. Enabling CMMA works on a per-CPU basis,
1260 * while the context use_cmma flag is per process.
1261 * It's possible that the context flag is enabled and the
1262 * SIE flag is not, so we set the flag always; if it was
1263 * already set, nothing changes, otherwise we enable it
1264 * on this CPU too.
1265 */
1266 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1267 /* Retry the ESSA instruction */
1268 kvm_s390_retry_instr(vcpu);
1269 } else {
1270 int srcu_idx;
1271
1272 mmap_read_lock(vcpu->kvm->mm);
1273 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1274 i = __do_essa(vcpu, orc);
1275 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
1276 mmap_read_unlock(vcpu->kvm->mm);
1277 if (i < 0)
1278 return i;
1279 /* Account for the possible extra cbrl entry */
1280 entries += i;
1281 }
1282 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1283 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1284 mmap_read_lock(gmap->mm);
1285 for (i = 0; i < entries; ++i)
1286 __gmap_zap(gmap, cbrlo[i]);
1287 mmap_read_unlock(gmap->mm);
1288 return 0;
1289}
1290
1291int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1292{
1293 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1294 case 0x8a:
1295 case 0x8e:
1296 case 0x8f:
1297 return handle_ipte_interlock(vcpu);
1298 case 0x8d:
1299 return handle_epsw(vcpu);
1300 case 0xab:
1301 return handle_essa(vcpu);
1302 case 0xaf:
1303 return handle_pfmf(vcpu);
1304 default:
1305 return -EOPNOTSUPP;
1306 }
1307}
1308
1309int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1310{
1311 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1312 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1313 int reg, rc, nr_regs;
1314 u32 ctl_array[16];
1315 u64 ga;
1316 u8 ar;
1317
1318 vcpu->stat.instruction_lctl++;
1319
1320 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1321 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1322
1323 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1324
1325 if (ga & 3)
1326 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1327
1328 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1329 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1330
1331 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1332 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1333 if (rc)
1334 return kvm_s390_inject_prog_cond(vcpu, rc);
1335 reg = reg1;
1336 nr_regs = 0;
1337 do {
1338 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1339 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1340 if (reg == reg3)
1341 break;
1342 reg = (reg + 1) % 16;
1343 } while (1);
1344 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1345 return 0;
1346}
1347
1348int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1349{
1350 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1351 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1352 int reg, rc, nr_regs;
1353 u32 ctl_array[16];
1354 u64 ga;
1355 u8 ar;
1356
1357 vcpu->stat.instruction_stctl++;
1358
1359 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1360 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1361
1362 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1363
1364 if (ga & 3)
1365 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1366
1367 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1368 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1369
1370 reg = reg1;
1371 nr_regs = 0;
1372 do {
1373 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1374 if (reg == reg3)
1375 break;
1376 reg = (reg + 1) % 16;
1377 } while (1);
1378 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1379 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1380}
1381
1382static int handle_lctlg(struct kvm_vcpu *vcpu)
1383{
1384 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1385 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1386 int reg, rc, nr_regs;
1387 u64 ctl_array[16];
1388 u64 ga;
1389 u8 ar;
1390
1391 vcpu->stat.instruction_lctlg++;
1392
1393 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1394 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1395
1396 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1397
1398 if (ga & 7)
1399 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1400
1401 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1402 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1403
1404 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1405 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1406 if (rc)
1407 return kvm_s390_inject_prog_cond(vcpu, rc);
1408 reg = reg1;
1409 nr_regs = 0;
1410 do {
1411 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1412 if (reg == reg3)
1413 break;
1414 reg = (reg + 1) % 16;
1415 } while (1);
1416 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1417 return 0;
1418}
1419
1420static int handle_stctg(struct kvm_vcpu *vcpu)
1421{
1422 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1423 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1424 int reg, rc, nr_regs;
1425 u64 ctl_array[16];
1426 u64 ga;
1427 u8 ar;
1428
1429 vcpu->stat.instruction_stctg++;
1430
1431 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1432 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1433
1434 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1435
1436 if (ga & 7)
1437 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1438
1439 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1440 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1441
1442 reg = reg1;
1443 nr_regs = 0;
1444 do {
1445 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1446 if (reg == reg3)
1447 break;
1448 reg = (reg + 1) % 16;
1449 } while (1);
1450 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1451 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1452}
1453
1454int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1455{
1456 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1457 case 0x25:
1458 return handle_stctg(vcpu);
1459 case 0x2f:
1460 return handle_lctlg(vcpu);
1461 case 0x60:
1462 case 0x61:
1463 case 0x62:
1464 return handle_ri(vcpu);
1465 default:
1466 return -EOPNOTSUPP;
1467 }
1468}
1469
1470static int handle_tprot(struct kvm_vcpu *vcpu)
1471{
1472 u64 address, operand2;
1473 unsigned long gpa;
1474 u8 access_key;
1475 bool writable;
1476 int ret, cc;
1477 u8 ar;
1478
1479 vcpu->stat.instruction_tprot++;
1480
1481 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1482 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1483
1484 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1485 access_key = (operand2 & 0xf0) >> 4;
1486
1487 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1488 ipte_lock(vcpu->kvm);
1489
1490 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1491 GACC_STORE, access_key);
1492 if (ret == 0) {
1493 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1494 } else if (ret == PGM_PROTECTION) {
1495 writable = false;
1496 /* Write protected? Try again with read-only... */
1497 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1498 GACC_FETCH, access_key);
1499 }
1500 if (ret >= 0) {
1501 cc = -1;
1502
1503 /* Fetching permitted; storing permitted */
1504 if (ret == 0 && writable)
1505 cc = 0;
1506 /* Fetching permitted; storing not permitted */
1507 else if (ret == 0 && !writable)
1508 cc = 1;
1509 /* Fetching not permitted; storing not permitted */
1510 else if (ret == PGM_PROTECTION)
1511 cc = 2;
1512 /* Translation not available */
1513 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1514 cc = 3;
1515
1516 if (cc != -1) {
1517 kvm_s390_set_psw_cc(vcpu, cc);
1518 ret = 0;
1519 } else {
1520 ret = kvm_s390_inject_program_int(vcpu, ret);
1521 }
1522 }
1523
1524 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1525 ipte_unlock(vcpu->kvm);
1526 return ret;
1527}
1528
1529int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1530{
1531 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1532 case 0x01:
1533 return handle_tprot(vcpu);
1534 default:
1535 return -EOPNOTSUPP;
1536 }
1537}
1538
1539static int handle_sckpf(struct kvm_vcpu *vcpu)
1540{
1541 u32 value;
1542
1543 vcpu->stat.instruction_sckpf++;
1544
1545 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1546 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1547
1548 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1549 return kvm_s390_inject_program_int(vcpu,
1550 PGM_SPECIFICATION);
1551
1552 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1553 vcpu->arch.sie_block->todpr = value;
1554
1555 return 0;
1556}
1557
1558static int handle_ptff(struct kvm_vcpu *vcpu)
1559{
1560 vcpu->stat.instruction_ptff++;
1561
1562 /* we don't emulate any control instructions yet */
1563 kvm_s390_set_psw_cc(vcpu, 3);
1564 return 0;
1565}
1566
1567int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1568{
1569 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1570 case 0x04:
1571 return handle_ptff(vcpu);
1572 case 0x07:
1573 return handle_sckpf(vcpu);
1574 default:
1575 return -EOPNOTSUPP;
1576 }
1577}