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/ptrace.h>
25 #include <asm/sclp.h>
26 #include <asm/ap.h>
27 #include <asm/gmap_helpers.h>
28 #include "gaccess.h"
29 #include "kvm-s390.h"
30 #include "trace.h"
31 #include "gmap.h"
32
handle_ri(struct kvm_vcpu * vcpu)33 static int handle_ri(struct kvm_vcpu *vcpu)
34 {
35 vcpu->stat.instruction_ri++;
36
37 if (test_kvm_facility(vcpu->kvm, 64)) {
38 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
39 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
40 kvm_s390_retry_instr(vcpu);
41 return 0;
42 } else
43 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
44 }
45
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)46 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
47 {
48 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
49 return handle_ri(vcpu);
50 else
51 return -EOPNOTSUPP;
52 }
53
handle_gs(struct kvm_vcpu * vcpu)54 static int handle_gs(struct kvm_vcpu *vcpu)
55 {
56 vcpu->stat.instruction_gs++;
57
58 if (test_kvm_facility(vcpu->kvm, 133)) {
59 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
60 preempt_disable();
61 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
62 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
63 restore_gs_cb(current->thread.gs_cb);
64 preempt_enable();
65 vcpu->arch.sie_block->ecb |= ECB_GS;
66 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
67 vcpu->arch.gs_enabled = 1;
68 kvm_s390_retry_instr(vcpu);
69 return 0;
70 } else
71 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
72 }
73
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)74 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
75 {
76 int code = vcpu->arch.sie_block->ipb & 0xff;
77
78 if (code == 0x49 || code == 0x4d)
79 return handle_gs(vcpu);
80 else
81 return -EOPNOTSUPP;
82 }
83 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)84 static int handle_set_clock(struct kvm_vcpu *vcpu)
85 {
86 struct kvm_s390_vm_tod_clock gtod = { 0 };
87 int rc;
88 u8 ar;
89 u64 op2;
90
91 vcpu->stat.instruction_sck++;
92
93 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
94 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
95
96 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
97 if (op2 & 7) /* Operand must be on a doubleword boundary */
98 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
99 rc = read_guest(vcpu, op2, ar, >od.tod, sizeof(gtod.tod));
100 if (rc)
101 return kvm_s390_inject_prog_cond(vcpu, rc);
102
103 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
104 /*
105 * To set the TOD clock the kvm lock must be taken, but the vcpu lock
106 * is already held in handle_set_clock. The usual lock order is the
107 * opposite. As SCK is deprecated and should not be used in several
108 * cases, for example when the multiple epoch facility or TOD clock
109 * steering facility is installed (see Principles of Operation), a
110 * slow path can be used. If the lock can not be taken via try_lock,
111 * the instruction will be retried via -EAGAIN at a later point in
112 * time.
113 */
114 if (!kvm_s390_try_set_tod_clock(vcpu->kvm, >od)) {
115 kvm_s390_retry_instr(vcpu);
116 return -EAGAIN;
117 }
118
119 kvm_s390_set_psw_cc(vcpu, 0);
120 return 0;
121 }
122
handle_set_prefix(struct kvm_vcpu * vcpu)123 static int handle_set_prefix(struct kvm_vcpu *vcpu)
124 {
125 u64 operand2;
126 u32 address;
127 int rc;
128 u8 ar;
129
130 vcpu->stat.instruction_spx++;
131
132 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
133 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
134
135 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
136
137 /* must be word boundary */
138 if (operand2 & 3)
139 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
140
141 /* get the value */
142 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
143 if (rc)
144 return kvm_s390_inject_prog_cond(vcpu, rc);
145
146 address &= 0x7fffe000u;
147
148 /*
149 * Make sure the new value is valid memory. We only need to check the
150 * first page, since address is 8k aligned and memory pieces are always
151 * at least 1MB aligned and have at least a size of 1MB.
152 */
153 if (!kvm_is_gpa_in_memslot(vcpu->kvm, address))
154 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
155
156 kvm_s390_set_prefix(vcpu, address);
157 trace_kvm_s390_handle_prefix(vcpu, 1, address);
158 return 0;
159 }
160
handle_store_prefix(struct kvm_vcpu * vcpu)161 static int handle_store_prefix(struct kvm_vcpu *vcpu)
162 {
163 u64 operand2;
164 u32 address;
165 int rc;
166 u8 ar;
167
168 vcpu->stat.instruction_stpx++;
169
170 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
171 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
172
173 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
174
175 /* must be word boundary */
176 if (operand2 & 3)
177 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
178
179 address = kvm_s390_get_prefix(vcpu);
180
181 /* get the value */
182 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
183 if (rc)
184 return kvm_s390_inject_prog_cond(vcpu, rc);
185
186 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
187 trace_kvm_s390_handle_prefix(vcpu, 0, address);
188 return 0;
189 }
190
handle_store_cpu_address(struct kvm_vcpu * vcpu)191 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
192 {
193 u16 vcpu_id = vcpu->vcpu_id;
194 u64 ga;
195 int rc;
196 u8 ar;
197
198 vcpu->stat.instruction_stap++;
199
200 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
201 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
202
203 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
204
205 if (ga & 1)
206 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
207
208 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
209 if (rc)
210 return kvm_s390_inject_prog_cond(vcpu, rc);
211
212 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
213 trace_kvm_s390_handle_stap(vcpu, ga);
214 return 0;
215 }
216
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)217 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
218 {
219 int rc;
220
221 trace_kvm_s390_skey_related_inst(vcpu);
222 /* Already enabled? */
223 if (vcpu->arch.skey_enabled)
224 return 0;
225
226 rc = gmap_enable_skeys(vcpu->arch.gmap);
227 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
228 if (rc)
229 return rc;
230
231 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
232 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
233 if (!vcpu->kvm->arch.use_skf)
234 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
235 else
236 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
237 vcpu->arch.skey_enabled = true;
238 return 0;
239 }
240
try_handle_skey(struct kvm_vcpu * vcpu)241 static int try_handle_skey(struct kvm_vcpu *vcpu)
242 {
243 int rc;
244
245 rc = kvm_s390_skey_check_enable(vcpu);
246 if (rc)
247 return rc;
248 if (vcpu->kvm->arch.use_skf) {
249 /* with storage-key facility, SIE interprets it for us */
250 kvm_s390_retry_instr(vcpu);
251 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
252 return -EAGAIN;
253 }
254 return 0;
255 }
256
handle_iske(struct kvm_vcpu * vcpu)257 static int handle_iske(struct kvm_vcpu *vcpu)
258 {
259 unsigned long gaddr;
260 int reg1, reg2;
261 union skey key;
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 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
279 rc = dat_get_storage_key(vcpu->arch.gmap->asce, gpa_to_gfn(gaddr), &key);
280 if (rc > 0)
281 return kvm_s390_inject_program_int(vcpu, rc);
282 if (rc < 0)
283 return rc;
284 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
285 vcpu->run->s.regs.gprs[reg1] |= key.skey;
286 return 0;
287 }
288
handle_rrbe(struct kvm_vcpu * vcpu)289 static int handle_rrbe(struct kvm_vcpu *vcpu)
290 {
291 unsigned long gaddr;
292 int reg1, reg2;
293 int rc;
294
295 vcpu->stat.instruction_rrbe++;
296
297 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
298 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
299
300 rc = try_handle_skey(vcpu);
301 if (rc)
302 return rc != -EAGAIN ? rc : 0;
303
304 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
305
306 gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
307 gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
308 gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
309 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
310 rc = dat_reset_reference_bit(vcpu->arch.gmap->asce, gpa_to_gfn(gaddr));
311 if (rc > 0)
312 return kvm_s390_inject_program_int(vcpu, rc);
313 if (rc < 0)
314 return rc;
315 kvm_s390_set_psw_cc(vcpu, rc);
316 return 0;
317 }
318
319 #define SSKE_NQ 0x8
320 #define SSKE_MR 0x4
321 #define SSKE_MC 0x2
322 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)323 static int handle_sske(struct kvm_vcpu *vcpu)
324 {
325 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
326 unsigned long start, end;
327 union skey key, oldkey;
328 int reg1, reg2;
329 int rc;
330
331 vcpu->stat.instruction_sske++;
332
333 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
334 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
335
336 rc = try_handle_skey(vcpu);
337 if (rc)
338 return rc != -EAGAIN ? rc : 0;
339
340 if (!test_kvm_facility(vcpu->kvm, 8))
341 m3 &= ~SSKE_MB;
342 if (!test_kvm_facility(vcpu->kvm, 10))
343 m3 &= ~(SSKE_MC | SSKE_MR);
344 if (!test_kvm_facility(vcpu->kvm, 14))
345 m3 &= ~SSKE_NQ;
346
347 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
348
349 key.skey = vcpu->run->s.regs.gprs[reg1] & 0xfe;
350 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
351 start = kvm_s390_logical_to_effective(vcpu, start);
352 if (m3 & SSKE_MB) {
353 /* start already designates an absolute address */
354 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
355 } else {
356 start = kvm_s390_real_to_abs(vcpu, start);
357 end = start + PAGE_SIZE;
358 }
359
360 while (start != end) {
361 scoped_guard(read_lock, &vcpu->kvm->mmu_lock) {
362 rc = dat_cond_set_storage_key(vcpu->arch.mc, vcpu->arch.gmap->asce,
363 gpa_to_gfn(start), key, &oldkey,
364 m3 & SSKE_NQ, m3 & SSKE_MR, m3 & SSKE_MC);
365 }
366 if (rc > 1)
367 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
368 if (rc == -ENOMEM) {
369 kvm_s390_mmu_cache_topup(vcpu->arch.mc);
370 continue;
371 }
372 if (rc < 0)
373 return rc;
374 start += PAGE_SIZE;
375 }
376
377 if (m3 & (SSKE_MC | SSKE_MR)) {
378 if (m3 & SSKE_MB) {
379 /* skey in reg1 is unpredictable */
380 kvm_s390_set_psw_cc(vcpu, 3);
381 } else {
382 kvm_s390_set_psw_cc(vcpu, rc);
383 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
384 vcpu->run->s.regs.gprs[reg1] |= (u64)oldkey.skey << 8;
385 }
386 }
387 if (m3 & SSKE_MB) {
388 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
389 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
390 else
391 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
392 end = kvm_s390_logical_to_effective(vcpu, end);
393 vcpu->run->s.regs.gprs[reg2] |= end;
394 }
395 return 0;
396 }
397
handle_ipte_interlock(struct kvm_vcpu * vcpu)398 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
399 {
400 vcpu->stat.instruction_ipte_interlock++;
401 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
402 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
403 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu->kvm));
404 kvm_s390_retry_instr(vcpu);
405 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
406 return 0;
407 }
408
handle_test_block(struct kvm_vcpu * vcpu)409 static int handle_test_block(struct kvm_vcpu *vcpu)
410 {
411 gpa_t addr;
412 int reg2;
413
414 vcpu->stat.instruction_tb++;
415
416 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
417 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
418
419 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
420 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
421 addr = kvm_s390_logical_to_effective(vcpu, addr);
422 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
423 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
424 addr = kvm_s390_real_to_abs(vcpu, addr);
425
426 if (!kvm_is_gpa_in_memslot(vcpu->kvm, addr))
427 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
428 /*
429 * We don't expect errors on modern systems, and do not care
430 * about storage keys (yet), so let's just clear the page.
431 */
432 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
433 return -EFAULT;
434 kvm_s390_set_psw_cc(vcpu, 0);
435 vcpu->run->s.regs.gprs[0] = 0;
436 return 0;
437 }
438
handle_tpi(struct kvm_vcpu * vcpu)439 static int handle_tpi(struct kvm_vcpu *vcpu)
440 {
441 struct kvm_s390_interrupt_info *inti;
442 unsigned long len;
443 u32 tpi_data[3];
444 int rc;
445 u64 addr;
446 u8 ar;
447
448 vcpu->stat.instruction_tpi++;
449
450 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
451 if (addr & 3)
452 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
453
454 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
455 if (!inti) {
456 kvm_s390_set_psw_cc(vcpu, 0);
457 return 0;
458 }
459
460 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
461 tpi_data[1] = inti->io.io_int_parm;
462 tpi_data[2] = inti->io.io_int_word;
463 if (addr) {
464 /*
465 * Store the two-word I/O interruption code into the
466 * provided area.
467 */
468 len = sizeof(tpi_data) - 4;
469 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
470 if (rc) {
471 rc = kvm_s390_inject_prog_cond(vcpu, rc);
472 goto reinject_interrupt;
473 }
474 } else {
475 /*
476 * Store the three-word I/O interruption code into
477 * the appropriate lowcore area.
478 */
479 len = sizeof(tpi_data);
480 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
481 /* failed writes to the low core are not recoverable */
482 rc = -EFAULT;
483 goto reinject_interrupt;
484 }
485 }
486
487 /* irq was successfully handed to the guest */
488 kfree(inti);
489 kvm_s390_set_psw_cc(vcpu, 1);
490 return 0;
491 reinject_interrupt:
492 /*
493 * If we encounter a problem storing the interruption code, the
494 * instruction is suppressed from the guest's view: reinject the
495 * interrupt.
496 */
497 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
498 kfree(inti);
499 rc = -EFAULT;
500 }
501 /* don't set the cc, a pgm irq was injected or we drop to user space */
502 return rc ? -EFAULT : 0;
503 }
504
handle_tsch(struct kvm_vcpu * vcpu)505 static int handle_tsch(struct kvm_vcpu *vcpu)
506 {
507 struct kvm_s390_interrupt_info *inti = NULL;
508 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
509
510 vcpu->stat.instruction_tsch++;
511
512 /* a valid schid has at least one bit set */
513 if (vcpu->run->s.regs.gprs[1])
514 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
515 vcpu->run->s.regs.gprs[1]);
516
517 /*
518 * Prepare exit to userspace.
519 * We indicate whether we dequeued a pending I/O interrupt
520 * so that userspace can re-inject it if the instruction gets
521 * a program check. While this may re-order the pending I/O
522 * interrupts, this is no problem since the priority is kept
523 * intact.
524 */
525 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
526 vcpu->run->s390_tsch.dequeued = !!inti;
527 if (inti) {
528 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
529 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
530 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
531 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
532 }
533 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
534 kfree(inti);
535 return -EREMOTE;
536 }
537
handle_io_inst(struct kvm_vcpu * vcpu)538 static int handle_io_inst(struct kvm_vcpu *vcpu)
539 {
540 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
541
542 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
543 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
544
545 if (vcpu->kvm->arch.css_support) {
546 /*
547 * Most I/O instructions will be handled by userspace.
548 * Exceptions are tpi and the interrupt portion of tsch.
549 */
550 if (vcpu->arch.sie_block->ipa == 0xb236)
551 return handle_tpi(vcpu);
552 if (vcpu->arch.sie_block->ipa == 0xb235)
553 return handle_tsch(vcpu);
554 /* Handle in userspace. */
555 vcpu->stat.instruction_io_other++;
556 return -EOPNOTSUPP;
557 } else {
558 /*
559 * Set condition code 3 to stop the guest from issuing channel
560 * I/O instructions.
561 */
562 kvm_s390_set_psw_cc(vcpu, 3);
563 return 0;
564 }
565 }
566
567 #if IS_ENABLED(CONFIG_VFIO_AP)
kvm_s390_is_gpa_in_memslot(struct kvm * kvm,gpa_t gpa)568 bool kvm_s390_is_gpa_in_memslot(struct kvm *kvm, gpa_t gpa)
569 {
570 return kvm_is_gpa_in_memslot(kvm, gpa);
571 }
572 EXPORT_SYMBOL_FOR_MODULES(kvm_s390_is_gpa_in_memslot, "vfio_ap");
573 #endif
574
575 /*
576 * handle_pqap: Handling pqap interception
577 * @vcpu: the vcpu having issue the pqap instruction
578 *
579 * We now support PQAP/AQIC instructions and we need to correctly
580 * answer the guest even if no dedicated driver's hook is available.
581 *
582 * The intercepting code calls a dedicated callback for this instruction
583 * if a driver did register one in the CRYPTO satellite of the
584 * SIE block.
585 *
586 * If no callback is available, the queues are not available, return this
587 * response code to the caller and set CC to 3.
588 * Else return the response code returned by the callback.
589 */
handle_pqap(struct kvm_vcpu * vcpu)590 static int handle_pqap(struct kvm_vcpu *vcpu)
591 {
592 struct ap_queue_status status = {};
593 crypto_hook pqap_hook;
594 unsigned long reg0;
595 int ret;
596 uint8_t fc;
597
598 /* Verify that the AP instruction are available */
599 if (!ap_instructions_available())
600 return -EOPNOTSUPP;
601 /* Verify that the guest is allowed to use AP instructions */
602 if (!(vcpu->arch.sie_block->eca & ECA_APIE))
603 return -EOPNOTSUPP;
604 /*
605 * The only possibly intercepted functions when AP instructions are
606 * available for the guest are AQIC and TAPQ with the t bit set
607 * since we do not set IC.3 (FIII) we currently will only intercept
608 * the AQIC function code.
609 * Note: running nested under z/VM can result in intercepts for other
610 * function codes, e.g. PQAP(QCI). We do not support this and bail out.
611 */
612 reg0 = vcpu->run->s.regs.gprs[0];
613 fc = (reg0 >> 24) & 0xff;
614 if (fc != 0x03)
615 return -EOPNOTSUPP;
616
617 /* PQAP instruction is allowed for guest kernel only */
618 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
619 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
620
621 /* Common PQAP instruction specification exceptions */
622 /* bits 41-47 must all be zeros */
623 if (reg0 & 0x007f0000UL)
624 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
625 /* APFT not install and T bit set */
626 if (!test_kvm_facility(vcpu->kvm, 15) && (reg0 & 0x00800000UL))
627 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
628 /* APXA not installed and APID greater 64 or APQI greater 16 */
629 if (!(vcpu->kvm->arch.crypto.crycbd & 0x02) && (reg0 & 0x0000c0f0UL))
630 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
631
632 /* AQIC function code specific exception */
633 /* facility 65 not present for AQIC function code */
634 if (!test_kvm_facility(vcpu->kvm, 65))
635 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
636
637 /*
638 * If the hook callback is registered, there will be a pointer to the
639 * hook function pointer in the kvm_s390_crypto structure. Lock the
640 * owner, retrieve the hook function pointer and call the hook.
641 */
642 down_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
643 if (vcpu->kvm->arch.crypto.pqap_hook) {
644 pqap_hook = *vcpu->kvm->arch.crypto.pqap_hook;
645 ret = pqap_hook(vcpu);
646 if (!ret) {
647 if (vcpu->run->s.regs.gprs[1] & 0x00ff0000)
648 kvm_s390_set_psw_cc(vcpu, 3);
649 else
650 kvm_s390_set_psw_cc(vcpu, 0);
651 }
652 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
653 return ret;
654 }
655 up_read(&vcpu->kvm->arch.crypto.pqap_hook_rwsem);
656 /*
657 * A vfio_driver must register a hook.
658 * No hook means no driver to enable the SIE CRYCB and no queues.
659 * We send this response to the guest.
660 */
661 status.response_code = 0x01;
662 memcpy(&vcpu->run->s.regs.gprs[1], &status, sizeof(status));
663 kvm_s390_set_psw_cc(vcpu, 3);
664 return 0;
665 }
666
handle_stfl(struct kvm_vcpu * vcpu)667 static int handle_stfl(struct kvm_vcpu *vcpu)
668 {
669 int rc;
670 unsigned int fac;
671
672 vcpu->stat.instruction_stfl++;
673
674 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
675 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
676
677 /*
678 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
679 * into a u32 memory representation. They will remain bits 0-31.
680 */
681 fac = *vcpu->kvm->arch.model.fac_list >> 32;
682 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
683 &fac, sizeof(fac));
684 if (rc)
685 return rc;
686 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
687 trace_kvm_s390_handle_stfl(vcpu, fac);
688 return 0;
689 }
690
691 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
692 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
693 #define PSW_ADDR_24 0x0000000000ffffffUL
694 #define PSW_ADDR_31 0x000000007fffffffUL
695
is_valid_psw(psw_t * psw)696 int is_valid_psw(psw_t *psw)
697 {
698 if (psw->mask & PSW_MASK_UNASSIGNED)
699 return 0;
700 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
701 if (psw->addr & ~PSW_ADDR_31)
702 return 0;
703 }
704 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
705 return 0;
706 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
707 return 0;
708 if (psw->addr & 1)
709 return 0;
710 return 1;
711 }
712
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)713 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
714 {
715 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
716 psw32_t new_psw;
717 u64 addr;
718 int rc;
719 u8 ar;
720
721 vcpu->stat.instruction_lpsw++;
722
723 if (gpsw->mask & PSW_MASK_PSTATE)
724 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
725
726 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
727 if (addr & 7)
728 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
729
730 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
731 if (rc)
732 return kvm_s390_inject_prog_cond(vcpu, rc);
733 if (!(new_psw.mask & PSW32_MASK_BASE))
734 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
735 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
736 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
737 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
738 if (!is_valid_psw(gpsw))
739 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
740 return 0;
741 }
742
handle_lpswe(struct kvm_vcpu * vcpu)743 static int handle_lpswe(struct kvm_vcpu *vcpu)
744 {
745 psw_t new_psw;
746 u64 addr;
747 int rc;
748 u8 ar;
749
750 vcpu->stat.instruction_lpswe++;
751
752 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
753 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
754
755 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
756 if (addr & 7)
757 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
758 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
759 if (rc)
760 return kvm_s390_inject_prog_cond(vcpu, rc);
761 vcpu->arch.sie_block->gpsw = new_psw;
762 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
763 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
764 return 0;
765 }
766
handle_lpswey(struct kvm_vcpu * vcpu)767 static int handle_lpswey(struct kvm_vcpu *vcpu)
768 {
769 psw_t new_psw;
770 u64 addr;
771 int rc;
772 u8 ar;
773
774 vcpu->stat.instruction_lpswey++;
775
776 if (!test_kvm_facility(vcpu->kvm, 193))
777 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
778
779 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
780 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
781
782 addr = kvm_s390_get_base_disp_siy(vcpu, &ar);
783 if (addr & 7)
784 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
785
786 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
787 if (rc)
788 return kvm_s390_inject_prog_cond(vcpu, rc);
789
790 vcpu->arch.sie_block->gpsw = new_psw;
791 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
792 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
793
794 return 0;
795 }
796
handle_stidp(struct kvm_vcpu * vcpu)797 static int handle_stidp(struct kvm_vcpu *vcpu)
798 {
799 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
800 u64 operand2;
801 int rc;
802 u8 ar;
803
804 vcpu->stat.instruction_stidp++;
805
806 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
807 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
808
809 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
810
811 if (operand2 & 7)
812 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
813
814 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
815 if (rc)
816 return kvm_s390_inject_prog_cond(vcpu, rc);
817
818 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
819 return 0;
820 }
821
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)822 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
823 {
824 int cpus = 0;
825 int n;
826
827 cpus = atomic_read(&vcpu->kvm->online_vcpus);
828
829 /* deal with other level 3 hypervisors */
830 if (stsi(mem, 3, 2, 2))
831 mem->count = 0;
832 if (mem->count < 8)
833 mem->count++;
834 for (n = mem->count - 1; n > 0 ; n--)
835 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
836
837 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
838 mem->vm[0].cpus_total = cpus;
839 mem->vm[0].cpus_configured = cpus;
840 mem->vm[0].cpus_standby = 0;
841 mem->vm[0].cpus_reserved = 0;
842 mem->vm[0].caf = 1000;
843 memcpy(mem->vm[0].name, "KVMguest", 8);
844 ASCEBC(mem->vm[0].name, 8);
845 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
846 ASCEBC(mem->vm[0].cpi, 16);
847 }
848
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)849 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
850 u8 fc, u8 sel1, u16 sel2)
851 {
852 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
853 vcpu->run->s390_stsi.addr = addr;
854 vcpu->run->s390_stsi.ar = ar;
855 vcpu->run->s390_stsi.fc = fc;
856 vcpu->run->s390_stsi.sel1 = sel1;
857 vcpu->run->s390_stsi.sel2 = sel2;
858 }
859
handle_stsi(struct kvm_vcpu * vcpu)860 static int handle_stsi(struct kvm_vcpu *vcpu)
861 {
862 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
863 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
864 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
865 unsigned long mem = 0;
866 u64 operand2;
867 int rc = 0;
868 u8 ar;
869
870 vcpu->stat.instruction_stsi++;
871 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
872
873 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
874 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
875
876 /* Bailout forbidden function codes */
877 if (fc > 3 && fc != 15)
878 goto out_no_data;
879
880 /*
881 * fc 15 is provided only with
882 * - PTF/CPU topology support through facility 15
883 * - KVM_CAP_S390_USER_STSI
884 */
885 if (fc == 15 && (!test_kvm_facility(vcpu->kvm, 11) ||
886 !vcpu->kvm->arch.user_stsi))
887 goto out_no_data;
888
889 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
890 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
891 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
892
893 if (fc == 0) {
894 vcpu->run->s.regs.gprs[0] = 3 << 28;
895 kvm_s390_set_psw_cc(vcpu, 0);
896 return 0;
897 }
898
899 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
900
901 if (!kvm_s390_pv_cpu_is_protected(vcpu) && (operand2 & 0xfff))
902 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
903
904 switch (fc) {
905 case 1: /* same handling for 1 and 2 */
906 case 2:
907 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
908 if (!mem)
909 goto out_no_data;
910 if (stsi((void *) mem, fc, sel1, sel2))
911 goto out_no_data;
912 break;
913 case 3:
914 if (sel1 != 2 || sel2 != 2)
915 goto out_no_data;
916 mem = get_zeroed_page(GFP_KERNEL_ACCOUNT);
917 if (!mem)
918 goto out_no_data;
919 handle_stsi_3_2_2(vcpu, (void *) mem);
920 break;
921 case 15: /* fc 15 is fully handled in userspace */
922 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
923 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
924 return -EREMOTE;
925 }
926 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
927 memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE);
928 rc = 0;
929 } else {
930 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
931 }
932 if (rc) {
933 rc = kvm_s390_inject_prog_cond(vcpu, rc);
934 goto out;
935 }
936 if (vcpu->kvm->arch.user_stsi) {
937 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
938 rc = -EREMOTE;
939 }
940 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
941 free_page(mem);
942 kvm_s390_set_psw_cc(vcpu, 0);
943 vcpu->run->s.regs.gprs[0] = 0;
944 return rc;
945 out_no_data:
946 kvm_s390_set_psw_cc(vcpu, 3);
947 out:
948 free_page(mem);
949 return rc;
950 }
951
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)952 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
953 {
954 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
955 case 0x02:
956 return handle_stidp(vcpu);
957 case 0x04:
958 return handle_set_clock(vcpu);
959 case 0x10:
960 return handle_set_prefix(vcpu);
961 case 0x11:
962 return handle_store_prefix(vcpu);
963 case 0x12:
964 return handle_store_cpu_address(vcpu);
965 case 0x14:
966 return kvm_s390_handle_vsie(vcpu);
967 case 0x21:
968 case 0x50:
969 return handle_ipte_interlock(vcpu);
970 case 0x29:
971 return handle_iske(vcpu);
972 case 0x2a:
973 return handle_rrbe(vcpu);
974 case 0x2b:
975 return handle_sske(vcpu);
976 case 0x2c:
977 return handle_test_block(vcpu);
978 case 0x30:
979 case 0x31:
980 case 0x32:
981 case 0x33:
982 case 0x34:
983 case 0x35:
984 case 0x36:
985 case 0x37:
986 case 0x38:
987 case 0x39:
988 case 0x3a:
989 case 0x3b:
990 case 0x3c:
991 case 0x5f:
992 case 0x74:
993 case 0x76:
994 return handle_io_inst(vcpu);
995 case 0x56:
996 return handle_sthyi(vcpu);
997 case 0x7d:
998 return handle_stsi(vcpu);
999 case 0xaf:
1000 return handle_pqap(vcpu);
1001 case 0xb1:
1002 return handle_stfl(vcpu);
1003 case 0xb2:
1004 return handle_lpswe(vcpu);
1005 default:
1006 return -EOPNOTSUPP;
1007 }
1008 }
1009
handle_epsw(struct kvm_vcpu * vcpu)1010 static int handle_epsw(struct kvm_vcpu *vcpu)
1011 {
1012 int reg1, reg2;
1013
1014 vcpu->stat.instruction_epsw++;
1015
1016 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1017
1018 /* This basically extracts the mask half of the psw. */
1019 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
1020 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
1021 if (reg2) {
1022 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
1023 vcpu->run->s.regs.gprs[reg2] |=
1024 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
1025 }
1026 return 0;
1027 }
1028
1029 #define PFMF_RESERVED 0xfffc0101UL
1030 #define PFMF_SK 0x00020000UL
1031 #define PFMF_CF 0x00010000UL
1032 #define PFMF_UI 0x00008000UL
1033 #define PFMF_FSC 0x00007000UL
1034 #define PFMF_NQ 0x00000800UL
1035 #define PFMF_MR 0x00000400UL
1036 #define PFMF_MC 0x00000200UL
1037 #define PFMF_KEY 0x000000feUL
1038
handle_pfmf(struct kvm_vcpu * vcpu)1039 static int handle_pfmf(struct kvm_vcpu *vcpu)
1040 {
1041 bool mr = false, mc = false, nq;
1042 int reg1, reg2;
1043 unsigned long start, end;
1044 union skey key;
1045
1046 vcpu->stat.instruction_pfmf++;
1047
1048 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
1049
1050 if (!test_kvm_facility(vcpu->kvm, 8))
1051 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1052
1053 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1054 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1055
1056 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
1057 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1058
1059 /* Only provide non-quiescing support if enabled for the guest */
1060 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
1061 !test_kvm_facility(vcpu->kvm, 14))
1062 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1063
1064 /* Only provide conditional-SSKE support if enabled for the guest */
1065 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
1066 test_kvm_facility(vcpu->kvm, 10)) {
1067 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
1068 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
1069 }
1070
1071 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
1072 key.skey = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
1073 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
1074 start = kvm_s390_logical_to_effective(vcpu, start);
1075
1076 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1077 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
1078 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
1079 }
1080
1081 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1082 case 0x00000000:
1083 /* only 4k frames specify a real address */
1084 start = kvm_s390_real_to_abs(vcpu, start);
1085 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1086 break;
1087 case 0x00001000:
1088 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
1089 break;
1090 case 0x00002000:
1091 /* only support 2G frame size if EDAT2 is available and we are
1092 not in 24-bit addressing mode */
1093 if (!test_kvm_facility(vcpu->kvm, 78) ||
1094 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
1095 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1096 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
1097 break;
1098 default:
1099 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1100 }
1101
1102 while (start != end) {
1103 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
1104 if (kvm_clear_guest(vcpu->kvm, start, PAGE_SIZE))
1105 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1106 }
1107
1108 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
1109 int rc = kvm_s390_skey_check_enable(vcpu);
1110
1111 if (rc)
1112 return rc;
1113 scoped_guard(read_lock, &vcpu->kvm->mmu_lock) {
1114 rc = dat_cond_set_storage_key(vcpu->arch.mc, vcpu->arch.gmap->asce,
1115 gpa_to_gfn(start), key,
1116 NULL, nq, mr, mc);
1117 }
1118 if (rc > 1)
1119 return kvm_s390_inject_program_int(vcpu, rc);
1120 if (rc == -ENOMEM) {
1121 kvm_s390_mmu_cache_topup(vcpu->arch.mc);
1122 continue;
1123 }
1124 if (rc < 0)
1125 return rc;
1126 }
1127 start += PAGE_SIZE;
1128 }
1129 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
1130 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
1131 vcpu->run->s.regs.gprs[reg2] = end;
1132 } else {
1133 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
1134 end = kvm_s390_logical_to_effective(vcpu, end);
1135 vcpu->run->s.regs.gprs[reg2] |= end;
1136 }
1137 }
1138 return 0;
1139 }
1140
1141 /*
1142 * Must be called with relevant read locks held (kvm->mm->mmap_lock, kvm->srcu)
1143 */
__do_essa(struct kvm_vcpu * vcpu,const int orc)1144 static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
1145 {
1146 int r1, r2, nappended, entries;
1147 union essa_state state;
1148 unsigned long *cbrlo;
1149 unsigned long gfn;
1150 bool dirtied;
1151
1152 /*
1153 * We don't need to set SD.FPF.SK to 1 here, because if we have a
1154 * machine check here we either handle it or crash
1155 */
1156
1157 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1158 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1159 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1160
1161 nappended = dat_perform_essa(vcpu->arch.gmap->asce, gfn, orc, &state, &dirtied);
1162 vcpu->run->s.regs.gprs[r1] = state.val;
1163 if (nappended < 0)
1164 return 0;
1165 /*
1166 * It is possible that all the normal 511 slots were full, in which case
1167 * we will now write in the 512th slot, which is reserved for host use.
1168 * In both cases we let the normal essa handling code process all the
1169 * slots, including the reserved one, if needed.
1170 */
1171 if (nappended > 0) {
1172 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1173 cbrlo[entries] = gfn << PAGE_SHIFT;
1174 }
1175
1176 if (dirtied)
1177 atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
1178
1179 return nappended;
1180 }
1181
_essa_clear_cbrl(struct kvm_vcpu * vcpu,unsigned long * cbrl,int len)1182 static void _essa_clear_cbrl(struct kvm_vcpu *vcpu, unsigned long *cbrl, int len)
1183 {
1184 union crste *crstep;
1185 union pgste pgste;
1186 union pte *ptep;
1187 int i;
1188
1189 lockdep_assert_held(&vcpu->kvm->mmu_lock);
1190
1191 for (i = 0; i < len; i++) {
1192 if (dat_entry_walk(NULL, gpa_to_gfn(cbrl[i]), vcpu->arch.gmap->asce,
1193 0, TABLE_TYPE_PAGE_TABLE, &crstep, &ptep))
1194 continue;
1195 if (!ptep || ptep->s.pr)
1196 continue;
1197 pgste = pgste_get_lock(ptep);
1198 if (pgste.usage == PGSTE_GPS_USAGE_UNUSED || pgste.zero)
1199 gmap_helper_zap_one_page(vcpu->kvm->mm, cbrl[i]);
1200 pgste_set_unlock(ptep, pgste);
1201 }
1202 }
1203
handle_essa(struct kvm_vcpu * vcpu)1204 static int handle_essa(struct kvm_vcpu *vcpu)
1205 {
1206 lockdep_assert_held(&vcpu->kvm->srcu);
1207
1208 /* entries expected to be 1FF */
1209 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1210 unsigned long *cbrlo;
1211 int i, orc;
1212
1213 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1214 vcpu->stat.instruction_essa++;
1215 if (!vcpu->kvm->arch.use_cmma)
1216 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1217
1218 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1219 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1220 /* Check for invalid operation request code */
1221 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1222 /* ORCs 0-6 are always valid */
1223 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1224 : ESSA_SET_STABLE_IF_RESIDENT))
1225 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1226
1227 if (!vcpu->kvm->arch.migration_mode) {
1228 /*
1229 * CMMA is enabled in the KVM settings, but is disabled in
1230 * the SIE block and in the mm_context, and we are not doing
1231 * a migration. Enable CMMA in the mm_context.
1232 * Since we need to take a write lock to write to the context
1233 * to avoid races with storage keys handling, we check if the
1234 * value really needs to be written to; if the value is
1235 * already correct, we do nothing and avoid the lock.
1236 */
1237 set_bit(GMAP_FLAG_USES_CMM, &vcpu->arch.gmap->flags);
1238 /*
1239 * If we are here, we are supposed to have CMMA enabled in
1240 * the SIE block. Enabling CMMA works on a per-CPU basis,
1241 * while the context use_cmma flag is per process.
1242 * It's possible that the context flag is enabled and the
1243 * SIE flag is not, so we set the flag always; if it was
1244 * already set, nothing changes, otherwise we enable it
1245 * on this CPU too.
1246 */
1247 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1248 /* Retry the ESSA instruction */
1249 kvm_s390_retry_instr(vcpu);
1250 } else {
1251 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
1252 i = __do_essa(vcpu, orc);
1253 if (i < 0)
1254 return i;
1255 /* Account for the possible extra cbrl entry */
1256 entries += i;
1257 }
1258 /* reset nceo */
1259 vcpu->arch.sie_block->cbrlo &= PAGE_MASK;
1260 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1261
1262 mmap_read_lock(vcpu->kvm->mm);
1263 scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
1264 _essa_clear_cbrl(vcpu, cbrlo, entries);
1265 mmap_read_unlock(vcpu->kvm->mm);
1266
1267 return 0;
1268 }
1269
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1270 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1271 {
1272 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1273 case 0x8a:
1274 case 0x8e:
1275 case 0x8f:
1276 return handle_ipte_interlock(vcpu);
1277 case 0x8d:
1278 return handle_epsw(vcpu);
1279 case 0xab:
1280 return handle_essa(vcpu);
1281 case 0xaf:
1282 return handle_pfmf(vcpu);
1283 default:
1284 return -EOPNOTSUPP;
1285 }
1286 }
1287
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1288 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1289 {
1290 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1291 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1292 int reg, rc, nr_regs;
1293 u32 ctl_array[16];
1294 u64 ga;
1295 u8 ar;
1296
1297 vcpu->stat.instruction_lctl++;
1298
1299 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1300 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1301
1302 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1303
1304 if (ga & 3)
1305 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1306
1307 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1308 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1309
1310 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1311 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1312 if (rc)
1313 return kvm_s390_inject_prog_cond(vcpu, rc);
1314 reg = reg1;
1315 nr_regs = 0;
1316 do {
1317 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1318 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1319 if (reg == reg3)
1320 break;
1321 reg = (reg + 1) % 16;
1322 } while (1);
1323 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1324 return 0;
1325 }
1326
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1327 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1328 {
1329 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1330 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1331 int reg, rc, nr_regs;
1332 u32 ctl_array[16];
1333 u64 ga;
1334 u8 ar;
1335
1336 vcpu->stat.instruction_stctl++;
1337
1338 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1339 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1340
1341 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1342
1343 if (ga & 3)
1344 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1345
1346 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1347 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1348
1349 reg = reg1;
1350 nr_regs = 0;
1351 do {
1352 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1353 if (reg == reg3)
1354 break;
1355 reg = (reg + 1) % 16;
1356 } while (1);
1357 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1358 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1359 }
1360
handle_lctlg(struct kvm_vcpu * vcpu)1361 static int handle_lctlg(struct kvm_vcpu *vcpu)
1362 {
1363 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1364 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1365 int reg, rc, nr_regs;
1366 u64 ctl_array[16];
1367 u64 ga;
1368 u8 ar;
1369
1370 vcpu->stat.instruction_lctlg++;
1371
1372 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1373 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1374
1375 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1376
1377 if (ga & 7)
1378 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1379
1380 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1381 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1382
1383 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1384 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1385 if (rc)
1386 return kvm_s390_inject_prog_cond(vcpu, rc);
1387 reg = reg1;
1388 nr_regs = 0;
1389 do {
1390 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1391 if (reg == reg3)
1392 break;
1393 reg = (reg + 1) % 16;
1394 } while (1);
1395 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1396 return 0;
1397 }
1398
handle_stctg(struct kvm_vcpu * vcpu)1399 static int handle_stctg(struct kvm_vcpu *vcpu)
1400 {
1401 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1402 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1403 int reg, rc, nr_regs;
1404 u64 ctl_array[16];
1405 u64 ga;
1406 u8 ar;
1407
1408 vcpu->stat.instruction_stctg++;
1409
1410 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1411 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1412
1413 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1414
1415 if (ga & 7)
1416 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1417
1418 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1419 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1420
1421 reg = reg1;
1422 nr_regs = 0;
1423 do {
1424 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1425 if (reg == reg3)
1426 break;
1427 reg = (reg + 1) % 16;
1428 } while (1);
1429 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1430 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1431 }
1432
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1433 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1434 {
1435 switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1436 case 0x25:
1437 return handle_stctg(vcpu);
1438 case 0x2f:
1439 return handle_lctlg(vcpu);
1440 case 0x60:
1441 case 0x61:
1442 case 0x62:
1443 return handle_ri(vcpu);
1444 case 0x71:
1445 return handle_lpswey(vcpu);
1446 default:
1447 return -EOPNOTSUPP;
1448 }
1449 }
1450
handle_tprot(struct kvm_vcpu * vcpu)1451 static int handle_tprot(struct kvm_vcpu *vcpu)
1452 {
1453 u64 address, operand2;
1454 unsigned long gpa;
1455 u8 access_key;
1456 bool writable;
1457 int ret, cc;
1458 u8 ar;
1459
1460 vcpu->stat.instruction_tprot++;
1461
1462 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1463 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1464
1465 kvm_s390_get_base_disp_sse(vcpu, &address, &operand2, &ar, NULL);
1466 access_key = (operand2 & 0xf0) >> 4;
1467
1468 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1469 ipte_lock(vcpu->kvm);
1470
1471 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1472 GACC_STORE, access_key);
1473 if (ret == 0) {
1474 gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1475 } else if (ret == PGM_PROTECTION) {
1476 writable = false;
1477 /* Write protected? Try again with read-only... */
1478 ret = guest_translate_address_with_key(vcpu, address, ar, &gpa,
1479 GACC_FETCH, access_key);
1480 }
1481 if (ret >= 0) {
1482 cc = -1;
1483
1484 /* Fetching permitted; storing permitted */
1485 if (ret == 0 && writable)
1486 cc = 0;
1487 /* Fetching permitted; storing not permitted */
1488 else if (ret == 0 && !writable)
1489 cc = 1;
1490 /* Fetching not permitted; storing not permitted */
1491 else if (ret == PGM_PROTECTION)
1492 cc = 2;
1493 /* Translation not available */
1494 else if (ret != PGM_ADDRESSING && ret != PGM_TRANSLATION_SPEC)
1495 cc = 3;
1496
1497 if (cc != -1) {
1498 kvm_s390_set_psw_cc(vcpu, cc);
1499 ret = 0;
1500 } else {
1501 ret = kvm_s390_inject_program_int(vcpu, ret);
1502 }
1503 }
1504
1505 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1506 ipte_unlock(vcpu->kvm);
1507 return ret;
1508 }
1509
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1510 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1511 {
1512 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1513 case 0x01:
1514 return handle_tprot(vcpu);
1515 default:
1516 return -EOPNOTSUPP;
1517 }
1518 }
1519
handle_sckpf(struct kvm_vcpu * vcpu)1520 static int handle_sckpf(struct kvm_vcpu *vcpu)
1521 {
1522 u32 value;
1523
1524 vcpu->stat.instruction_sckpf++;
1525
1526 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1527 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1528
1529 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1530 return kvm_s390_inject_program_int(vcpu,
1531 PGM_SPECIFICATION);
1532
1533 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1534 vcpu->arch.sie_block->todpr = value;
1535
1536 return 0;
1537 }
1538
handle_ptff(struct kvm_vcpu * vcpu)1539 static int handle_ptff(struct kvm_vcpu *vcpu)
1540 {
1541 vcpu->stat.instruction_ptff++;
1542
1543 /* we don't emulate any control instructions yet */
1544 kvm_s390_set_psw_cc(vcpu, 3);
1545 return 0;
1546 }
1547
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1548 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1549 {
1550 switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1551 case 0x04:
1552 return handle_ptff(vcpu);
1553 case 0x07:
1554 return handle_sckpf(vcpu);
1555 default:
1556 return -EOPNOTSUPP;
1557 }
1558 }
1559