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 <linux/mm_types.h>
19
20 #include <asm/asm-offsets.h>
21 #include <asm/facility.h>
22 #include <asm/current.h>
23 #include <asm/debug.h>
24 #include <asm/ebcdic.h>
25 #include <asm/sysinfo.h>
26 #include <asm/pgtable.h>
27 #include <asm/page-states.h>
28 #include <asm/pgalloc.h>
29 #include <asm/gmap.h>
30 #include <asm/io.h>
31 #include <asm/ptrace.h>
32 #include <asm/compat.h>
33 #include <asm/sclp.h>
34 #include "gaccess.h"
35 #include "kvm-s390.h"
36 #include "trace.h"
37
handle_ri(struct kvm_vcpu * vcpu)38 static int handle_ri(struct kvm_vcpu *vcpu)
39 {
40 if (test_kvm_facility(vcpu->kvm, 64)) {
41 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
42 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
43 kvm_s390_retry_instr(vcpu);
44 return 0;
45 } else
46 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
47 }
48
kvm_s390_handle_aa(struct kvm_vcpu * vcpu)49 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
50 {
51 if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
52 return handle_ri(vcpu);
53 else
54 return -EOPNOTSUPP;
55 }
56
handle_gs(struct kvm_vcpu * vcpu)57 static int handle_gs(struct kvm_vcpu *vcpu)
58 {
59 if (test_kvm_facility(vcpu->kvm, 133)) {
60 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
61 preempt_disable();
62 __ctl_set_bit(2, 4);
63 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
64 restore_gs_cb(current->thread.gs_cb);
65 preempt_enable();
66 vcpu->arch.sie_block->ecb |= ECB_GS;
67 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
68 vcpu->arch.gs_enabled = 1;
69 kvm_s390_retry_instr(vcpu);
70 return 0;
71 } else
72 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
73 }
74
kvm_s390_handle_e3(struct kvm_vcpu * vcpu)75 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
76 {
77 int code = vcpu->arch.sie_block->ipb & 0xff;
78
79 if (code == 0x49 || code == 0x4d)
80 return handle_gs(vcpu);
81 else
82 return -EOPNOTSUPP;
83 }
84 /* Handle SCK (SET CLOCK) interception */
handle_set_clock(struct kvm_vcpu * vcpu)85 static int handle_set_clock(struct kvm_vcpu *vcpu)
86 {
87 struct kvm_s390_vm_tod_clock gtod = { 0 };
88 int rc;
89 u8 ar;
90 u64 op2;
91
92 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 kvm_s390_set_tod_clock(vcpu->kvm, >od);
104
105 kvm_s390_set_psw_cc(vcpu, 0);
106 return 0;
107 }
108
handle_set_prefix(struct kvm_vcpu * vcpu)109 static int handle_set_prefix(struct kvm_vcpu *vcpu)
110 {
111 u64 operand2;
112 u32 address;
113 int rc;
114 u8 ar;
115
116 vcpu->stat.instruction_spx++;
117
118 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
119 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
120
121 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
122
123 /* must be word boundary */
124 if (operand2 & 3)
125 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
126
127 /* get the value */
128 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
129 if (rc)
130 return kvm_s390_inject_prog_cond(vcpu, rc);
131
132 address &= 0x7fffe000u;
133
134 /*
135 * Make sure the new value is valid memory. We only need to check the
136 * first page, since address is 8k aligned and memory pieces are always
137 * at least 1MB aligned and have at least a size of 1MB.
138 */
139 if (kvm_is_error_gpa(vcpu->kvm, address))
140 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
141
142 kvm_s390_set_prefix(vcpu, address);
143 trace_kvm_s390_handle_prefix(vcpu, 1, address);
144 return 0;
145 }
146
handle_store_prefix(struct kvm_vcpu * vcpu)147 static int handle_store_prefix(struct kvm_vcpu *vcpu)
148 {
149 u64 operand2;
150 u32 address;
151 int rc;
152 u8 ar;
153
154 vcpu->stat.instruction_stpx++;
155
156 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
157 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
158
159 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
160
161 /* must be word boundary */
162 if (operand2 & 3)
163 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
164
165 address = kvm_s390_get_prefix(vcpu);
166
167 /* get the value */
168 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
169 if (rc)
170 return kvm_s390_inject_prog_cond(vcpu, rc);
171
172 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
173 trace_kvm_s390_handle_prefix(vcpu, 0, address);
174 return 0;
175 }
176
handle_store_cpu_address(struct kvm_vcpu * vcpu)177 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
178 {
179 u16 vcpu_id = vcpu->vcpu_id;
180 u64 ga;
181 int rc;
182 u8 ar;
183
184 vcpu->stat.instruction_stap++;
185
186 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
187 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
188
189 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
190
191 if (ga & 1)
192 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
193
194 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
195 if (rc)
196 return kvm_s390_inject_prog_cond(vcpu, rc);
197
198 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
199 trace_kvm_s390_handle_stap(vcpu, ga);
200 return 0;
201 }
202
kvm_s390_skey_check_enable(struct kvm_vcpu * vcpu)203 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
204 {
205 int rc = 0;
206 struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
207
208 trace_kvm_s390_skey_related_inst(vcpu);
209 if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) &&
210 !(atomic_read(&sie_block->cpuflags) & CPUSTAT_KSS))
211 return rc;
212
213 rc = s390_enable_skey();
214 VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
215 if (!rc) {
216 if (atomic_read(&sie_block->cpuflags) & CPUSTAT_KSS)
217 atomic_andnot(CPUSTAT_KSS, &sie_block->cpuflags);
218 else
219 sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE |
220 ICTL_RRBE);
221 }
222 return rc;
223 }
224
try_handle_skey(struct kvm_vcpu * vcpu)225 static int try_handle_skey(struct kvm_vcpu *vcpu)
226 {
227 int rc;
228
229 vcpu->stat.instruction_storage_key++;
230 rc = kvm_s390_skey_check_enable(vcpu);
231 if (rc)
232 return rc;
233 if (sclp.has_skey) {
234 /* with storage-key facility, SIE interprets it for us */
235 kvm_s390_retry_instr(vcpu);
236 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
237 return -EAGAIN;
238 }
239 return 0;
240 }
241
handle_iske(struct kvm_vcpu * vcpu)242 static int handle_iske(struct kvm_vcpu *vcpu)
243 {
244 unsigned long addr;
245 unsigned char key;
246 int reg1, reg2;
247 int rc;
248
249 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
250 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
251
252 rc = try_handle_skey(vcpu);
253 if (rc)
254 return rc != -EAGAIN ? rc : 0;
255
256 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
257
258 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
259 addr = kvm_s390_logical_to_effective(vcpu, addr);
260 addr = kvm_s390_real_to_abs(vcpu, addr);
261 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
262 if (kvm_is_error_hva(addr))
263 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
264
265 down_read(¤t->mm->mmap_sem);
266 rc = get_guest_storage_key(current->mm, addr, &key);
267 up_read(¤t->mm->mmap_sem);
268 if (rc)
269 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
270 vcpu->run->s.regs.gprs[reg1] &= ~0xff;
271 vcpu->run->s.regs.gprs[reg1] |= key;
272 return 0;
273 }
274
handle_rrbe(struct kvm_vcpu * vcpu)275 static int handle_rrbe(struct kvm_vcpu *vcpu)
276 {
277 unsigned long addr;
278 int reg1, reg2;
279 int rc;
280
281 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
282 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
283
284 rc = try_handle_skey(vcpu);
285 if (rc)
286 return rc != -EAGAIN ? rc : 0;
287
288 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
289
290 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
291 addr = kvm_s390_logical_to_effective(vcpu, addr);
292 addr = kvm_s390_real_to_abs(vcpu, addr);
293 addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
294 if (kvm_is_error_hva(addr))
295 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
296
297 down_read(¤t->mm->mmap_sem);
298 rc = reset_guest_reference_bit(current->mm, addr);
299 up_read(¤t->mm->mmap_sem);
300 if (rc < 0)
301 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
302
303 kvm_s390_set_psw_cc(vcpu, rc);
304 return 0;
305 }
306
307 #define SSKE_NQ 0x8
308 #define SSKE_MR 0x4
309 #define SSKE_MC 0x2
310 #define SSKE_MB 0x1
handle_sske(struct kvm_vcpu * vcpu)311 static int handle_sske(struct kvm_vcpu *vcpu)
312 {
313 unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
314 unsigned long start, end;
315 unsigned char key, oldkey;
316 int reg1, reg2;
317 int rc;
318
319 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
320 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
321
322 rc = try_handle_skey(vcpu);
323 if (rc)
324 return rc != -EAGAIN ? rc : 0;
325
326 if (!test_kvm_facility(vcpu->kvm, 8))
327 m3 &= ~SSKE_MB;
328 if (!test_kvm_facility(vcpu->kvm, 10))
329 m3 &= ~(SSKE_MC | SSKE_MR);
330 if (!test_kvm_facility(vcpu->kvm, 14))
331 m3 &= ~SSKE_NQ;
332
333 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
334
335 key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
336 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
337 start = kvm_s390_logical_to_effective(vcpu, start);
338 if (m3 & SSKE_MB) {
339 /* start already designates an absolute address */
340 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
341 } else {
342 start = kvm_s390_real_to_abs(vcpu, start);
343 end = start + PAGE_SIZE;
344 }
345
346 while (start != end) {
347 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
348
349 if (kvm_is_error_hva(addr))
350 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
351
352 down_read(¤t->mm->mmap_sem);
353 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
354 m3 & SSKE_NQ, m3 & SSKE_MR,
355 m3 & SSKE_MC);
356 up_read(¤t->mm->mmap_sem);
357 if (rc < 0)
358 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
359 start += PAGE_SIZE;
360 }
361
362 if (m3 & (SSKE_MC | SSKE_MR)) {
363 if (m3 & SSKE_MB) {
364 /* skey in reg1 is unpredictable */
365 kvm_s390_set_psw_cc(vcpu, 3);
366 } else {
367 kvm_s390_set_psw_cc(vcpu, rc);
368 vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
369 vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
370 }
371 }
372 if (m3 & SSKE_MB) {
373 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
374 vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
375 else
376 vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
377 end = kvm_s390_logical_to_effective(vcpu, end);
378 vcpu->run->s.regs.gprs[reg2] |= end;
379 }
380 return 0;
381 }
382
handle_ipte_interlock(struct kvm_vcpu * vcpu)383 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
384 {
385 vcpu->stat.instruction_ipte_interlock++;
386 if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
387 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
388 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
389 kvm_s390_retry_instr(vcpu);
390 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
391 return 0;
392 }
393
handle_test_block(struct kvm_vcpu * vcpu)394 static int handle_test_block(struct kvm_vcpu *vcpu)
395 {
396 gpa_t addr;
397 int reg2;
398
399 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
400 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
401
402 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
403 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
404 addr = kvm_s390_logical_to_effective(vcpu, addr);
405 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
406 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
407 addr = kvm_s390_real_to_abs(vcpu, addr);
408
409 if (kvm_is_error_gpa(vcpu->kvm, addr))
410 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
411 /*
412 * We don't expect errors on modern systems, and do not care
413 * about storage keys (yet), so let's just clear the page.
414 */
415 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
416 return -EFAULT;
417 kvm_s390_set_psw_cc(vcpu, 0);
418 vcpu->run->s.regs.gprs[0] = 0;
419 return 0;
420 }
421
handle_tpi(struct kvm_vcpu * vcpu)422 static int handle_tpi(struct kvm_vcpu *vcpu)
423 {
424 struct kvm_s390_interrupt_info *inti;
425 unsigned long len;
426 u32 tpi_data[3];
427 int rc;
428 u64 addr;
429 u8 ar;
430
431 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
432 if (addr & 3)
433 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
434
435 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
436 if (!inti) {
437 kvm_s390_set_psw_cc(vcpu, 0);
438 return 0;
439 }
440
441 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
442 tpi_data[1] = inti->io.io_int_parm;
443 tpi_data[2] = inti->io.io_int_word;
444 if (addr) {
445 /*
446 * Store the two-word I/O interruption code into the
447 * provided area.
448 */
449 len = sizeof(tpi_data) - 4;
450 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
451 if (rc) {
452 rc = kvm_s390_inject_prog_cond(vcpu, rc);
453 goto reinject_interrupt;
454 }
455 } else {
456 /*
457 * Store the three-word I/O interruption code into
458 * the appropriate lowcore area.
459 */
460 len = sizeof(tpi_data);
461 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
462 /* failed writes to the low core are not recoverable */
463 rc = -EFAULT;
464 goto reinject_interrupt;
465 }
466 }
467
468 /* irq was successfully handed to the guest */
469 kfree(inti);
470 kvm_s390_set_psw_cc(vcpu, 1);
471 return 0;
472 reinject_interrupt:
473 /*
474 * If we encounter a problem storing the interruption code, the
475 * instruction is suppressed from the guest's view: reinject the
476 * interrupt.
477 */
478 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
479 kfree(inti);
480 rc = -EFAULT;
481 }
482 /* don't set the cc, a pgm irq was injected or we drop to user space */
483 return rc ? -EFAULT : 0;
484 }
485
handle_tsch(struct kvm_vcpu * vcpu)486 static int handle_tsch(struct kvm_vcpu *vcpu)
487 {
488 struct kvm_s390_interrupt_info *inti = NULL;
489 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
490
491 /* a valid schid has at least one bit set */
492 if (vcpu->run->s.regs.gprs[1])
493 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
494 vcpu->run->s.regs.gprs[1]);
495
496 /*
497 * Prepare exit to userspace.
498 * We indicate whether we dequeued a pending I/O interrupt
499 * so that userspace can re-inject it if the instruction gets
500 * a program check. While this may re-order the pending I/O
501 * interrupts, this is no problem since the priority is kept
502 * intact.
503 */
504 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
505 vcpu->run->s390_tsch.dequeued = !!inti;
506 if (inti) {
507 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
508 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
509 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
510 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
511 }
512 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
513 kfree(inti);
514 return -EREMOTE;
515 }
516
handle_io_inst(struct kvm_vcpu * vcpu)517 static int handle_io_inst(struct kvm_vcpu *vcpu)
518 {
519 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
520
521 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
522 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
523
524 if (vcpu->kvm->arch.css_support) {
525 /*
526 * Most I/O instructions will be handled by userspace.
527 * Exceptions are tpi and the interrupt portion of tsch.
528 */
529 if (vcpu->arch.sie_block->ipa == 0xb236)
530 return handle_tpi(vcpu);
531 if (vcpu->arch.sie_block->ipa == 0xb235)
532 return handle_tsch(vcpu);
533 /* Handle in userspace. */
534 return -EOPNOTSUPP;
535 } else {
536 /*
537 * Set condition code 3 to stop the guest from issuing channel
538 * I/O instructions.
539 */
540 kvm_s390_set_psw_cc(vcpu, 3);
541 return 0;
542 }
543 }
544
handle_stfl(struct kvm_vcpu * vcpu)545 static int handle_stfl(struct kvm_vcpu *vcpu)
546 {
547 int rc;
548 unsigned int fac;
549
550 vcpu->stat.instruction_stfl++;
551
552 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
553 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
554
555 /*
556 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
557 * into a u32 memory representation. They will remain bits 0-31.
558 */
559 fac = *vcpu->kvm->arch.model.fac_list >> 32;
560 rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
561 &fac, sizeof(fac));
562 if (rc)
563 return rc;
564 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
565 trace_kvm_s390_handle_stfl(vcpu, fac);
566 return 0;
567 }
568
569 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
570 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
571 #define PSW_ADDR_24 0x0000000000ffffffUL
572 #define PSW_ADDR_31 0x000000007fffffffUL
573
is_valid_psw(psw_t * psw)574 int is_valid_psw(psw_t *psw)
575 {
576 if (psw->mask & PSW_MASK_UNASSIGNED)
577 return 0;
578 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
579 if (psw->addr & ~PSW_ADDR_31)
580 return 0;
581 }
582 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
583 return 0;
584 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
585 return 0;
586 if (psw->addr & 1)
587 return 0;
588 return 1;
589 }
590
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)591 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
592 {
593 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
594 psw_compat_t new_psw;
595 u64 addr;
596 int rc;
597 u8 ar;
598
599 if (gpsw->mask & PSW_MASK_PSTATE)
600 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
601
602 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
603 if (addr & 7)
604 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
605
606 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
607 if (rc)
608 return kvm_s390_inject_prog_cond(vcpu, rc);
609 if (!(new_psw.mask & PSW32_MASK_BASE))
610 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
611 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
612 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
613 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
614 if (!is_valid_psw(gpsw))
615 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
616 return 0;
617 }
618
handle_lpswe(struct kvm_vcpu * vcpu)619 static int handle_lpswe(struct kvm_vcpu *vcpu)
620 {
621 psw_t new_psw;
622 u64 addr;
623 int rc;
624 u8 ar;
625
626 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
627 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
628
629 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
630 if (addr & 7)
631 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
632 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
633 if (rc)
634 return kvm_s390_inject_prog_cond(vcpu, rc);
635 vcpu->arch.sie_block->gpsw = new_psw;
636 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
637 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
638 return 0;
639 }
640
handle_stidp(struct kvm_vcpu * vcpu)641 static int handle_stidp(struct kvm_vcpu *vcpu)
642 {
643 u64 stidp_data = vcpu->kvm->arch.model.cpuid;
644 u64 operand2;
645 int rc;
646 u8 ar;
647
648 vcpu->stat.instruction_stidp++;
649
650 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
651 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
652
653 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
654
655 if (operand2 & 7)
656 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
657
658 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
659 if (rc)
660 return kvm_s390_inject_prog_cond(vcpu, rc);
661
662 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
663 return 0;
664 }
665
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)666 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
667 {
668 int cpus = 0;
669 int n;
670
671 cpus = atomic_read(&vcpu->kvm->online_vcpus);
672
673 /* deal with other level 3 hypervisors */
674 if (stsi(mem, 3, 2, 2))
675 mem->count = 0;
676 if (mem->count < 8)
677 mem->count++;
678 for (n = mem->count - 1; n > 0 ; n--)
679 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
680
681 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
682 mem->vm[0].cpus_total = cpus;
683 mem->vm[0].cpus_configured = cpus;
684 mem->vm[0].cpus_standby = 0;
685 mem->vm[0].cpus_reserved = 0;
686 mem->vm[0].caf = 1000;
687 memcpy(mem->vm[0].name, "KVMguest", 8);
688 ASCEBC(mem->vm[0].name, 8);
689 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
690 ASCEBC(mem->vm[0].cpi, 16);
691 }
692
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,u8 ar,u8 fc,u8 sel1,u16 sel2)693 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
694 u8 fc, u8 sel1, u16 sel2)
695 {
696 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
697 vcpu->run->s390_stsi.addr = addr;
698 vcpu->run->s390_stsi.ar = ar;
699 vcpu->run->s390_stsi.fc = fc;
700 vcpu->run->s390_stsi.sel1 = sel1;
701 vcpu->run->s390_stsi.sel2 = sel2;
702 }
703
handle_stsi(struct kvm_vcpu * vcpu)704 static int handle_stsi(struct kvm_vcpu *vcpu)
705 {
706 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
707 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
708 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
709 unsigned long mem = 0;
710 u64 operand2;
711 int rc = 0;
712 u8 ar;
713
714 vcpu->stat.instruction_stsi++;
715 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
716
717 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
718 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
719
720 if (fc > 3) {
721 kvm_s390_set_psw_cc(vcpu, 3);
722 return 0;
723 }
724
725 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
726 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
727 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
728
729 if (fc == 0) {
730 vcpu->run->s.regs.gprs[0] = 3 << 28;
731 kvm_s390_set_psw_cc(vcpu, 0);
732 return 0;
733 }
734
735 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
736
737 if (operand2 & 0xfff)
738 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
739
740 switch (fc) {
741 case 1: /* same handling for 1 and 2 */
742 case 2:
743 mem = get_zeroed_page(GFP_KERNEL);
744 if (!mem)
745 goto out_no_data;
746 if (stsi((void *) mem, fc, sel1, sel2))
747 goto out_no_data;
748 break;
749 case 3:
750 if (sel1 != 2 || sel2 != 2)
751 goto out_no_data;
752 mem = get_zeroed_page(GFP_KERNEL);
753 if (!mem)
754 goto out_no_data;
755 handle_stsi_3_2_2(vcpu, (void *) mem);
756 break;
757 }
758
759 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
760 if (rc) {
761 rc = kvm_s390_inject_prog_cond(vcpu, rc);
762 goto out;
763 }
764 if (vcpu->kvm->arch.user_stsi) {
765 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
766 rc = -EREMOTE;
767 }
768 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
769 free_page(mem);
770 kvm_s390_set_psw_cc(vcpu, 0);
771 vcpu->run->s.regs.gprs[0] = 0;
772 return rc;
773 out_no_data:
774 kvm_s390_set_psw_cc(vcpu, 3);
775 out:
776 free_page(mem);
777 return rc;
778 }
779
780 static const intercept_handler_t b2_handlers[256] = {
781 [0x02] = handle_stidp,
782 [0x04] = handle_set_clock,
783 [0x10] = handle_set_prefix,
784 [0x11] = handle_store_prefix,
785 [0x12] = handle_store_cpu_address,
786 [0x14] = kvm_s390_handle_vsie,
787 [0x21] = handle_ipte_interlock,
788 [0x29] = handle_iske,
789 [0x2a] = handle_rrbe,
790 [0x2b] = handle_sske,
791 [0x2c] = handle_test_block,
792 [0x30] = handle_io_inst,
793 [0x31] = handle_io_inst,
794 [0x32] = handle_io_inst,
795 [0x33] = handle_io_inst,
796 [0x34] = handle_io_inst,
797 [0x35] = handle_io_inst,
798 [0x36] = handle_io_inst,
799 [0x37] = handle_io_inst,
800 [0x38] = handle_io_inst,
801 [0x39] = handle_io_inst,
802 [0x3a] = handle_io_inst,
803 [0x3b] = handle_io_inst,
804 [0x3c] = handle_io_inst,
805 [0x50] = handle_ipte_interlock,
806 [0x56] = handle_sthyi,
807 [0x5f] = handle_io_inst,
808 [0x74] = handle_io_inst,
809 [0x76] = handle_io_inst,
810 [0x7d] = handle_stsi,
811 [0xb1] = handle_stfl,
812 [0xb2] = handle_lpswe,
813 };
814
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)815 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
816 {
817 intercept_handler_t handler;
818
819 /*
820 * A lot of B2 instructions are priviledged. Here we check for
821 * the privileged ones, that we can handle in the kernel.
822 * Anything else goes to userspace.
823 */
824 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
825 if (handler)
826 return handler(vcpu);
827
828 return -EOPNOTSUPP;
829 }
830
handle_epsw(struct kvm_vcpu * vcpu)831 static int handle_epsw(struct kvm_vcpu *vcpu)
832 {
833 int reg1, reg2;
834
835 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
836
837 /* This basically extracts the mask half of the psw. */
838 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
839 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
840 if (reg2) {
841 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
842 vcpu->run->s.regs.gprs[reg2] |=
843 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
844 }
845 return 0;
846 }
847
848 #define PFMF_RESERVED 0xfffc0101UL
849 #define PFMF_SK 0x00020000UL
850 #define PFMF_CF 0x00010000UL
851 #define PFMF_UI 0x00008000UL
852 #define PFMF_FSC 0x00007000UL
853 #define PFMF_NQ 0x00000800UL
854 #define PFMF_MR 0x00000400UL
855 #define PFMF_MC 0x00000200UL
856 #define PFMF_KEY 0x000000feUL
857
handle_pfmf(struct kvm_vcpu * vcpu)858 static int handle_pfmf(struct kvm_vcpu *vcpu)
859 {
860 bool mr = false, mc = false, nq;
861 int reg1, reg2;
862 unsigned long start, end;
863 unsigned char key;
864
865 vcpu->stat.instruction_pfmf++;
866
867 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
868
869 if (!test_kvm_facility(vcpu->kvm, 8))
870 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
871
872 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
873 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
874
875 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
876 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
877
878 /* Only provide non-quiescing support if enabled for the guest */
879 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
880 !test_kvm_facility(vcpu->kvm, 14))
881 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
882
883 /* Only provide conditional-SSKE support if enabled for the guest */
884 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
885 test_kvm_facility(vcpu->kvm, 10)) {
886 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
887 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
888 }
889
890 nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
891 key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
892 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
893 start = kvm_s390_logical_to_effective(vcpu, start);
894
895 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
896 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
897 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
898 }
899
900 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
901 case 0x00000000:
902 /* only 4k frames specify a real address */
903 start = kvm_s390_real_to_abs(vcpu, start);
904 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
905 break;
906 case 0x00001000:
907 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
908 break;
909 case 0x00002000:
910 /* only support 2G frame size if EDAT2 is available and we are
911 not in 24-bit addressing mode */
912 if (!test_kvm_facility(vcpu->kvm, 78) ||
913 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
914 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
915 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
916 break;
917 default:
918 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
919 }
920
921 while (start != end) {
922 unsigned long useraddr;
923
924 /* Translate guest address to host address */
925 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
926 if (kvm_is_error_hva(useraddr))
927 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
928
929 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
930 if (clear_user((void __user *)useraddr, PAGE_SIZE))
931 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
932 }
933
934 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
935 int rc = kvm_s390_skey_check_enable(vcpu);
936
937 if (rc)
938 return rc;
939 down_read(¤t->mm->mmap_sem);
940 rc = cond_set_guest_storage_key(current->mm, useraddr,
941 key, NULL, nq, mr, mc);
942 up_read(¤t->mm->mmap_sem);
943 if (rc < 0)
944 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
945 }
946
947 start += PAGE_SIZE;
948 }
949 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
950 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
951 vcpu->run->s.regs.gprs[reg2] = end;
952 } else {
953 vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
954 end = kvm_s390_logical_to_effective(vcpu, end);
955 vcpu->run->s.regs.gprs[reg2] |= end;
956 }
957 }
958 return 0;
959 }
960
do_essa(struct kvm_vcpu * vcpu,const int orc)961 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
962 {
963 struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state;
964 int r1, r2, nappended, entries;
965 unsigned long gfn, hva, res, pgstev, ptev;
966 unsigned long *cbrlo;
967
968 /*
969 * We don't need to set SD.FPF.SK to 1 here, because if we have a
970 * machine check here we either handle it or crash
971 */
972
973 kvm_s390_get_regs_rre(vcpu, &r1, &r2);
974 gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
975 hva = gfn_to_hva(vcpu->kvm, gfn);
976 entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
977
978 if (kvm_is_error_hva(hva))
979 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
980
981 nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
982 if (nappended < 0) {
983 res = orc ? 0x10 : 0;
984 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
985 return 0;
986 }
987 res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
988 /*
989 * Set the block-content state part of the result. 0 means resident, so
990 * nothing to do if the page is valid. 2 is for preserved pages
991 * (non-present and non-zero), and 3 for zero pages (non-present and
992 * zero).
993 */
994 if (ptev & _PAGE_INVALID) {
995 res |= 2;
996 if (pgstev & _PGSTE_GPS_ZERO)
997 res |= 1;
998 }
999 if (pgstev & _PGSTE_GPS_NODAT)
1000 res |= 0x20;
1001 vcpu->run->s.regs.gprs[r1] = res;
1002 /*
1003 * It is possible that all the normal 511 slots were full, in which case
1004 * we will now write in the 512th slot, which is reserved for host use.
1005 * In both cases we let the normal essa handling code process all the
1006 * slots, including the reserved one, if needed.
1007 */
1008 if (nappended > 0) {
1009 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1010 cbrlo[entries] = gfn << PAGE_SHIFT;
1011 }
1012
1013 if (orc && gfn < ms->bitmap_size) {
1014 /* increment only if we are really flipping the bit to 1 */
1015 if (!test_and_set_bit(gfn, ms->pgste_bitmap))
1016 atomic64_inc(&ms->dirty_pages);
1017 }
1018
1019 return nappended;
1020 }
1021
handle_essa(struct kvm_vcpu * vcpu)1022 static int handle_essa(struct kvm_vcpu *vcpu)
1023 {
1024 /* entries expected to be 1FF */
1025 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1026 unsigned long *cbrlo;
1027 struct gmap *gmap;
1028 int i, orc;
1029
1030 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1031 gmap = vcpu->arch.gmap;
1032 vcpu->stat.instruction_essa++;
1033 if (!vcpu->kvm->arch.use_cmma)
1034 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1035
1036 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1037 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1038 /* Check for invalid operation request code */
1039 orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1040 /* ORCs 0-6 are always valid */
1041 if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1042 : ESSA_SET_STABLE_IF_RESIDENT))
1043 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1044
1045 if (likely(!vcpu->kvm->arch.migration_state)) {
1046 /*
1047 * CMMA is enabled in the KVM settings, but is disabled in
1048 * the SIE block and in the mm_context, and we are not doing
1049 * a migration. Enable CMMA in the mm_context.
1050 * Since we need to take a write lock to write to the context
1051 * to avoid races with storage keys handling, we check if the
1052 * value really needs to be written to; if the value is
1053 * already correct, we do nothing and avoid the lock.
1054 */
1055 if (vcpu->kvm->mm->context.use_cmma == 0) {
1056 down_write(&vcpu->kvm->mm->mmap_sem);
1057 vcpu->kvm->mm->context.use_cmma = 1;
1058 up_write(&vcpu->kvm->mm->mmap_sem);
1059 }
1060 /*
1061 * If we are here, we are supposed to have CMMA enabled in
1062 * the SIE block. Enabling CMMA works on a per-CPU basis,
1063 * while the context use_cmma flag is per process.
1064 * It's possible that the context flag is enabled and the
1065 * SIE flag is not, so we set the flag always; if it was
1066 * already set, nothing changes, otherwise we enable it
1067 * on this CPU too.
1068 */
1069 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1070 /* Retry the ESSA instruction */
1071 kvm_s390_retry_instr(vcpu);
1072 } else {
1073 /* Account for the possible extra cbrl entry */
1074 i = do_essa(vcpu, orc);
1075 if (i < 0)
1076 return i;
1077 entries += i;
1078 }
1079 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
1080 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1081 down_read(&gmap->mm->mmap_sem);
1082 for (i = 0; i < entries; ++i)
1083 __gmap_zap(gmap, cbrlo[i]);
1084 up_read(&gmap->mm->mmap_sem);
1085 return 0;
1086 }
1087
1088 static const intercept_handler_t b9_handlers[256] = {
1089 [0x8a] = handle_ipte_interlock,
1090 [0x8d] = handle_epsw,
1091 [0x8e] = handle_ipte_interlock,
1092 [0x8f] = handle_ipte_interlock,
1093 [0xab] = handle_essa,
1094 [0xaf] = handle_pfmf,
1095 };
1096
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)1097 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1098 {
1099 intercept_handler_t handler;
1100
1101 /* This is handled just as for the B2 instructions. */
1102 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1103 if (handler)
1104 return handler(vcpu);
1105
1106 return -EOPNOTSUPP;
1107 }
1108
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)1109 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1110 {
1111 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1112 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1113 int reg, rc, nr_regs;
1114 u32 ctl_array[16];
1115 u64 ga;
1116 u8 ar;
1117
1118 vcpu->stat.instruction_lctl++;
1119
1120 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1121 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1122
1123 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1124
1125 if (ga & 3)
1126 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1127
1128 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1129 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1130
1131 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1132 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1133 if (rc)
1134 return kvm_s390_inject_prog_cond(vcpu, rc);
1135 reg = reg1;
1136 nr_regs = 0;
1137 do {
1138 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1139 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1140 if (reg == reg3)
1141 break;
1142 reg = (reg + 1) % 16;
1143 } while (1);
1144 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1145 return 0;
1146 }
1147
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)1148 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1149 {
1150 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1151 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1152 int reg, rc, nr_regs;
1153 u32 ctl_array[16];
1154 u64 ga;
1155 u8 ar;
1156
1157 vcpu->stat.instruction_stctl++;
1158
1159 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1160 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1161
1162 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1163
1164 if (ga & 3)
1165 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1166
1167 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1168 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1169
1170 reg = reg1;
1171 nr_regs = 0;
1172 do {
1173 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1174 if (reg == reg3)
1175 break;
1176 reg = (reg + 1) % 16;
1177 } while (1);
1178 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1179 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1180 }
1181
handle_lctlg(struct kvm_vcpu * vcpu)1182 static int handle_lctlg(struct kvm_vcpu *vcpu)
1183 {
1184 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1185 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1186 int reg, rc, nr_regs;
1187 u64 ctl_array[16];
1188 u64 ga;
1189 u8 ar;
1190
1191 vcpu->stat.instruction_lctlg++;
1192
1193 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1194 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1195
1196 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1197
1198 if (ga & 7)
1199 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1200
1201 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1202 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1203
1204 nr_regs = ((reg3 - reg1) & 0xf) + 1;
1205 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1206 if (rc)
1207 return kvm_s390_inject_prog_cond(vcpu, rc);
1208 reg = reg1;
1209 nr_regs = 0;
1210 do {
1211 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1212 if (reg == reg3)
1213 break;
1214 reg = (reg + 1) % 16;
1215 } while (1);
1216 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1217 return 0;
1218 }
1219
handle_stctg(struct kvm_vcpu * vcpu)1220 static int handle_stctg(struct kvm_vcpu *vcpu)
1221 {
1222 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1223 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1224 int reg, rc, nr_regs;
1225 u64 ctl_array[16];
1226 u64 ga;
1227 u8 ar;
1228
1229 vcpu->stat.instruction_stctg++;
1230
1231 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1232 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1233
1234 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1235
1236 if (ga & 7)
1237 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1238
1239 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1240 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1241
1242 reg = reg1;
1243 nr_regs = 0;
1244 do {
1245 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1246 if (reg == reg3)
1247 break;
1248 reg = (reg + 1) % 16;
1249 } while (1);
1250 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1251 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1252 }
1253
1254 static const intercept_handler_t eb_handlers[256] = {
1255 [0x2f] = handle_lctlg,
1256 [0x25] = handle_stctg,
1257 [0x60] = handle_ri,
1258 [0x61] = handle_ri,
1259 [0x62] = handle_ri,
1260 };
1261
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)1262 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1263 {
1264 intercept_handler_t handler;
1265
1266 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
1267 if (handler)
1268 return handler(vcpu);
1269 return -EOPNOTSUPP;
1270 }
1271
handle_tprot(struct kvm_vcpu * vcpu)1272 static int handle_tprot(struct kvm_vcpu *vcpu)
1273 {
1274 u64 address1, address2;
1275 unsigned long hva, gpa;
1276 int ret = 0, cc = 0;
1277 bool writable;
1278 u8 ar;
1279
1280 vcpu->stat.instruction_tprot++;
1281
1282 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1283 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1284
1285 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1286
1287 /* we only handle the Linux memory detection case:
1288 * access key == 0
1289 * everything else goes to userspace. */
1290 if (address2 & 0xf0)
1291 return -EOPNOTSUPP;
1292 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1293 ipte_lock(vcpu);
1294 ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1295 if (ret == PGM_PROTECTION) {
1296 /* Write protected? Try again with read-only... */
1297 cc = 1;
1298 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1299 GACC_FETCH);
1300 }
1301 if (ret) {
1302 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1303 ret = kvm_s390_inject_program_int(vcpu, ret);
1304 } else if (ret > 0) {
1305 /* Translation not available */
1306 kvm_s390_set_psw_cc(vcpu, 3);
1307 ret = 0;
1308 }
1309 goto out_unlock;
1310 }
1311
1312 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1313 if (kvm_is_error_hva(hva)) {
1314 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1315 } else {
1316 if (!writable)
1317 cc = 1; /* Write not permitted ==> read-only */
1318 kvm_s390_set_psw_cc(vcpu, cc);
1319 /* Note: CC2 only occurs for storage keys (not supported yet) */
1320 }
1321 out_unlock:
1322 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1323 ipte_unlock(vcpu);
1324 return ret;
1325 }
1326
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1327 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1328 {
1329 /* For e5xx... instructions we only handle TPROT */
1330 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1331 return handle_tprot(vcpu);
1332 return -EOPNOTSUPP;
1333 }
1334
handle_sckpf(struct kvm_vcpu * vcpu)1335 static int handle_sckpf(struct kvm_vcpu *vcpu)
1336 {
1337 u32 value;
1338
1339 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1340 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1341
1342 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1343 return kvm_s390_inject_program_int(vcpu,
1344 PGM_SPECIFICATION);
1345
1346 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1347 vcpu->arch.sie_block->todpr = value;
1348
1349 return 0;
1350 }
1351
handle_ptff(struct kvm_vcpu * vcpu)1352 static int handle_ptff(struct kvm_vcpu *vcpu)
1353 {
1354 /* we don't emulate any control instructions yet */
1355 kvm_s390_set_psw_cc(vcpu, 3);
1356 return 0;
1357 }
1358
1359 static const intercept_handler_t x01_handlers[256] = {
1360 [0x04] = handle_ptff,
1361 [0x07] = handle_sckpf,
1362 };
1363
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1364 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1365 {
1366 intercept_handler_t handler;
1367
1368 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1369 if (handler)
1370 return handler(vcpu);
1371 return -EOPNOTSUPP;
1372 }
1373