?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.16-rc2
[linux/fpc-iii.git] / arch / s390 / kvm / priv.c
blobf89c1cd677519b205ff6f130f43453a5d5dc236a
1 /*
2 * handling privileged instructions
3 *
4 * Copyright IBM Corp. 2008, 2013
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
12 */
13
14 #include <linux/kvm.h>
15 #include <linux/gfp.h>
16 #include <linux/errno.h>
17 #include <linux/compat.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/facility.h>
20 #include <asm/current.h>
21 #include <asm/debug.h>
22 #include <asm/ebcdic.h>
23 #include <asm/sysinfo.h>
24 #include <asm/pgtable.h>
25 #include <asm/pgalloc.h>
26 #include <asm/io.h>
27 #include <asm/ptrace.h>
28 #include <asm/compat.h>
29 #include "gaccess.h"
30 #include "kvm-s390.h"
31 #include "trace.h"
32
33 /* Handle SCK (SET CLOCK) interception */
34 static int handle_set_clock(struct kvm_vcpu *vcpu)
35 {
36 struct kvm_vcpu *cpup;
37 s64 hostclk, val;
38 int i, rc;
39 u64 op2;
40
41 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
42 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
43
44 op2 = kvm_s390_get_base_disp_s(vcpu);
45 if (op2 & 7) /* Operand must be on a doubleword boundary */
46 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
47 rc = read_guest(vcpu, op2, &val, sizeof(val));
48 if (rc)
49 return kvm_s390_inject_prog_cond(vcpu, rc);
50
51 if (store_tod_clock(&hostclk)) {
52 kvm_s390_set_psw_cc(vcpu, 3);
53 return 0;
54 }
55 val = (val - hostclk) & ~0x3fUL;
56
57 mutex_lock(&vcpu->kvm->lock);
58 kvm_for_each_vcpu(i, cpup, vcpu->kvm)
59 cpup->arch.sie_block->epoch = val;
60 mutex_unlock(&vcpu->kvm->lock);
61
62 kvm_s390_set_psw_cc(vcpu, 0);
63 return 0;
64 }
65
66 static int handle_set_prefix(struct kvm_vcpu *vcpu)
67 {
68 u64 operand2;
69 u32 address;
70 int rc;
71
72 vcpu->stat.instruction_spx++;
73
74 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
75 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
76
77 operand2 = kvm_s390_get_base_disp_s(vcpu);
78
79 /* must be word boundary */
80 if (operand2 & 3)
81 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
82
83 /* get the value */
84 rc = read_guest(vcpu, operand2, &address, sizeof(address));
85 if (rc)
86 return kvm_s390_inject_prog_cond(vcpu, rc);
87
88 address &= 0x7fffe000u;
89
90 /*
91 * Make sure the new value is valid memory. We only need to check the
92 * first page, since address is 8k aligned and memory pieces are always
93 * at least 1MB aligned and have at least a size of 1MB.
94 */
95 if (kvm_is_error_gpa(vcpu->kvm, address))
96 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
97
98 kvm_s390_set_prefix(vcpu, address);
99
100 VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
101 trace_kvm_s390_handle_prefix(vcpu, 1, address);
102 return 0;
103 }
104
105 static int handle_store_prefix(struct kvm_vcpu *vcpu)
106 {
107 u64 operand2;
108 u32 address;
109 int rc;
110
111 vcpu->stat.instruction_stpx++;
112
113 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
114 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
115
116 operand2 = kvm_s390_get_base_disp_s(vcpu);
117
118 /* must be word boundary */
119 if (operand2 & 3)
120 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
121
122 address = kvm_s390_get_prefix(vcpu);
123
124 /* get the value */
125 rc = write_guest(vcpu, operand2, &address, sizeof(address));
126 if (rc)
127 return kvm_s390_inject_prog_cond(vcpu, rc);
128
129 VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
130 trace_kvm_s390_handle_prefix(vcpu, 0, address);
131 return 0;
132 }
133
134 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
135 {
136 u16 vcpu_id = vcpu->vcpu_id;
137 u64 ga;
138 int rc;
139
140 vcpu->stat.instruction_stap++;
141
142 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
143 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
144
145 ga = kvm_s390_get_base_disp_s(vcpu);
146
147 if (ga & 1)
148 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
149
150 rc = write_guest(vcpu, ga, &vcpu_id, sizeof(vcpu_id));
151 if (rc)
152 return kvm_s390_inject_prog_cond(vcpu, rc);
153
154 VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", ga);
155 trace_kvm_s390_handle_stap(vcpu, ga);
156 return 0;
157 }
158
159 static void __skey_check_enable(struct kvm_vcpu *vcpu)
160 {
161 if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
162 return;
163
164 s390_enable_skey();
165 trace_kvm_s390_skey_related_inst(vcpu);
166 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
167 }
168
169
170 static int handle_skey(struct kvm_vcpu *vcpu)
171 {
172 __skey_check_enable(vcpu);
173
174 vcpu->stat.instruction_storage_key++;
175
176 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
177 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
178
179 vcpu->arch.sie_block->gpsw.addr =
180 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
181 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
182 return 0;
183 }
184
185 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
186 {
187 psw_t *psw = &vcpu->arch.sie_block->gpsw;
188
189 vcpu->stat.instruction_ipte_interlock++;
190 if (psw_bits(*psw).p)
191 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
192 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
193 psw->addr = __rewind_psw(*psw, 4);
194 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
195 return 0;
196 }
197
198 static int handle_test_block(struct kvm_vcpu *vcpu)
199 {
200 gpa_t addr;
201 int reg2;
202
203 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
204 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
205
206 kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
207 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
208 addr = kvm_s390_logical_to_effective(vcpu, addr);
209 if (kvm_s390_check_low_addr_protection(vcpu, addr))
210 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
211 addr = kvm_s390_real_to_abs(vcpu, addr);
212
213 if (kvm_is_error_gpa(vcpu->kvm, addr))
214 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
215 /*
216 * We don't expect errors on modern systems, and do not care
217 * about storage keys (yet), so let's just clear the page.
218 */
219 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
220 return -EFAULT;
221 kvm_s390_set_psw_cc(vcpu, 0);
222 vcpu->run->s.regs.gprs[0] = 0;
223 return 0;
224 }
225
226 static int handle_tpi(struct kvm_vcpu *vcpu)
227 {
228 struct kvm_s390_interrupt_info *inti;
229 unsigned long len;
230 u32 tpi_data[3];
231 int cc, rc;
232 u64 addr;
233
234 rc = 0;
235 addr = kvm_s390_get_base_disp_s(vcpu);
236 if (addr & 3)
237 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
238 cc = 0;
239 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
240 if (!inti)
241 goto no_interrupt;
242 cc = 1;
243 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
244 tpi_data[1] = inti->io.io_int_parm;
245 tpi_data[2] = inti->io.io_int_word;
246 if (addr) {
247 /*
248 * Store the two-word I/O interruption code into the
249 * provided area.
250 */
251 len = sizeof(tpi_data) - 4;
252 rc = write_guest(vcpu, addr, &tpi_data, len);
253 if (rc)
254 return kvm_s390_inject_prog_cond(vcpu, rc);
255 } else {
256 /*
257 * Store the three-word I/O interruption code into
258 * the appropriate lowcore area.
259 */
260 len = sizeof(tpi_data);
261 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len))
262 rc = -EFAULT;
263 }
264 /*
265 * If we encounter a problem storing the interruption code, the
266 * instruction is suppressed from the guest's view: reinject the
267 * interrupt.
268 */
269 if (!rc)
270 kfree(inti);
271 else
272 kvm_s390_reinject_io_int(vcpu->kvm, inti);
273 no_interrupt:
274 /* Set condition code and we're done. */
275 if (!rc)
276 kvm_s390_set_psw_cc(vcpu, cc);
277 return rc ? -EFAULT : 0;
278 }
279
280 static int handle_tsch(struct kvm_vcpu *vcpu)
281 {
282 struct kvm_s390_interrupt_info *inti;
283
284 inti = kvm_s390_get_io_int(vcpu->kvm, 0,
285 vcpu->run->s.regs.gprs[1]);
286
287 /*
288 * Prepare exit to userspace.
289 * We indicate whether we dequeued a pending I/O interrupt
290 * so that userspace can re-inject it if the instruction gets
291 * a program check. While this may re-order the pending I/O
292 * interrupts, this is no problem since the priority is kept
293 * intact.
294 */
295 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
296 vcpu->run->s390_tsch.dequeued = !!inti;
297 if (inti) {
298 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
299 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
300 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
301 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
302 }
303 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
304 kfree(inti);
305 return -EREMOTE;
306 }
307
308 static int handle_io_inst(struct kvm_vcpu *vcpu)
309 {
310 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
311
312 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
313 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
314
315 if (vcpu->kvm->arch.css_support) {
316 /*
317 * Most I/O instructions will be handled by userspace.
318 * Exceptions are tpi and the interrupt portion of tsch.
319 */
320 if (vcpu->arch.sie_block->ipa == 0xb236)
321 return handle_tpi(vcpu);
322 if (vcpu->arch.sie_block->ipa == 0xb235)
323 return handle_tsch(vcpu);
324 /* Handle in userspace. */
325 return -EOPNOTSUPP;
326 } else {
327 /*
328 * Set condition code 3 to stop the guest from issuing channel
329 * I/O instructions.
330 */
331 kvm_s390_set_psw_cc(vcpu, 3);
332 return 0;
333 }
334 }
335
336 static int handle_stfl(struct kvm_vcpu *vcpu)
337 {
338 int rc;
339
340 vcpu->stat.instruction_stfl++;
341
342 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
343 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
344
345 rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
346 vfacilities, 4);
347 if (rc)
348 return rc;
349 VCPU_EVENT(vcpu, 5, "store facility list value %x",
350 *(unsigned int *) vfacilities);
351 trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
352 return 0;
353 }
354
355 static void handle_new_psw(struct kvm_vcpu *vcpu)
356 {
357 /* Check whether the new psw is enabled for machine checks. */
358 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
359 kvm_s390_deliver_pending_machine_checks(vcpu);
360 }
361
362 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
363 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
364 #define PSW_ADDR_24 0x0000000000ffffffUL
365 #define PSW_ADDR_31 0x000000007fffffffUL
366
367 int is_valid_psw(psw_t *psw)
368 {
369 if (psw->mask & PSW_MASK_UNASSIGNED)
370 return 0;
371 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
372 if (psw->addr & ~PSW_ADDR_31)
373 return 0;
374 }
375 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
376 return 0;
377 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
378 return 0;
379 if (psw->addr & 1)
380 return 0;
381 return 1;
382 }
383
384 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
385 {
386 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
387 psw_compat_t new_psw;
388 u64 addr;
389 int rc;
390
391 if (gpsw->mask & PSW_MASK_PSTATE)
392 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
393
394 addr = kvm_s390_get_base_disp_s(vcpu);
395 if (addr & 7)
396 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
397
398 rc = read_guest(vcpu, addr, &new_psw, sizeof(new_psw));
399 if (rc)
400 return kvm_s390_inject_prog_cond(vcpu, rc);
401 if (!(new_psw.mask & PSW32_MASK_BASE))
402 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
403 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
404 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
405 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
406 if (!is_valid_psw(gpsw))
407 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
408 handle_new_psw(vcpu);
409 return 0;
410 }
411
412 static int handle_lpswe(struct kvm_vcpu *vcpu)
413 {
414 psw_t new_psw;
415 u64 addr;
416 int rc;
417
418 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
419 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
420
421 addr = kvm_s390_get_base_disp_s(vcpu);
422 if (addr & 7)
423 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
424 rc = read_guest(vcpu, addr, &new_psw, sizeof(new_psw));
425 if (rc)
426 return kvm_s390_inject_prog_cond(vcpu, rc);
427 vcpu->arch.sie_block->gpsw = new_psw;
428 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
429 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
430 handle_new_psw(vcpu);
431 return 0;
432 }
433
434 static int handle_stidp(struct kvm_vcpu *vcpu)
435 {
436 u64 stidp_data = vcpu->arch.stidp_data;
437 u64 operand2;
438 int rc;
439
440 vcpu->stat.instruction_stidp++;
441
442 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
443 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
444
445 operand2 = kvm_s390_get_base_disp_s(vcpu);
446
447 if (operand2 & 7)
448 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
449
450 rc = write_guest(vcpu, operand2, &stidp_data, sizeof(stidp_data));
451 if (rc)
452 return kvm_s390_inject_prog_cond(vcpu, rc);
453
454 VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
455 return 0;
456 }
457
458 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
459 {
460 int cpus = 0;
461 int n;
462
463 cpus = atomic_read(&vcpu->kvm->online_vcpus);
464
465 /* deal with other level 3 hypervisors */
466 if (stsi(mem, 3, 2, 2))
467 mem->count = 0;
468 if (mem->count < 8)
469 mem->count++;
470 for (n = mem->count - 1; n > 0 ; n--)
471 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
472
473 mem->vm[0].cpus_total = cpus;
474 mem->vm[0].cpus_configured = cpus;
475 mem->vm[0].cpus_standby = 0;
476 mem->vm[0].cpus_reserved = 0;
477 mem->vm[0].caf = 1000;
478 memcpy(mem->vm[0].name, "KVMguest", 8);
479 ASCEBC(mem->vm[0].name, 8);
480 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
481 ASCEBC(mem->vm[0].cpi, 16);
482 }
483
484 static int handle_stsi(struct kvm_vcpu *vcpu)
485 {
486 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
487 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
488 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
489 unsigned long mem = 0;
490 u64 operand2;
491 int rc = 0;
492
493 vcpu->stat.instruction_stsi++;
494 VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
495
496 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
497 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
498
499 if (fc > 3) {
500 kvm_s390_set_psw_cc(vcpu, 3);
501 return 0;
502 }
503
504 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
505 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
506 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
507
508 if (fc == 0) {
509 vcpu->run->s.regs.gprs[0] = 3 << 28;
510 kvm_s390_set_psw_cc(vcpu, 0);
511 return 0;
512 }
513
514 operand2 = kvm_s390_get_base_disp_s(vcpu);
515
516 if (operand2 & 0xfff)
517 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
518
519 switch (fc) {
520 case 1: /* same handling for 1 and 2 */
521 case 2:
522 mem = get_zeroed_page(GFP_KERNEL);
523 if (!mem)
524 goto out_no_data;
525 if (stsi((void *) mem, fc, sel1, sel2))
526 goto out_no_data;
527 break;
528 case 3:
529 if (sel1 != 2 || sel2 != 2)
530 goto out_no_data;
531 mem = get_zeroed_page(GFP_KERNEL);
532 if (!mem)
533 goto out_no_data;
534 handle_stsi_3_2_2(vcpu, (void *) mem);
535 break;
536 }
537
538 rc = write_guest(vcpu, operand2, (void *)mem, PAGE_SIZE);
539 if (rc) {
540 rc = kvm_s390_inject_prog_cond(vcpu, rc);
541 goto out;
542 }
543 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
544 free_page(mem);
545 kvm_s390_set_psw_cc(vcpu, 0);
546 vcpu->run->s.regs.gprs[0] = 0;
547 return 0;
548 out_no_data:
549 kvm_s390_set_psw_cc(vcpu, 3);
550 out:
551 free_page(mem);
552 return rc;
553 }
554
555 static const intercept_handler_t b2_handlers[256] = {
556 [0x02] = handle_stidp,
557 [0x04] = handle_set_clock,
558 [0x10] = handle_set_prefix,
559 [0x11] = handle_store_prefix,
560 [0x12] = handle_store_cpu_address,
561 [0x21] = handle_ipte_interlock,
562 [0x29] = handle_skey,
563 [0x2a] = handle_skey,
564 [0x2b] = handle_skey,
565 [0x2c] = handle_test_block,
566 [0x30] = handle_io_inst,
567 [0x31] = handle_io_inst,
568 [0x32] = handle_io_inst,
569 [0x33] = handle_io_inst,
570 [0x34] = handle_io_inst,
571 [0x35] = handle_io_inst,
572 [0x36] = handle_io_inst,
573 [0x37] = handle_io_inst,
574 [0x38] = handle_io_inst,
575 [0x39] = handle_io_inst,
576 [0x3a] = handle_io_inst,
577 [0x3b] = handle_io_inst,
578 [0x3c] = handle_io_inst,
579 [0x50] = handle_ipte_interlock,
580 [0x5f] = handle_io_inst,
581 [0x74] = handle_io_inst,
582 [0x76] = handle_io_inst,
583 [0x7d] = handle_stsi,
584 [0xb1] = handle_stfl,
585 [0xb2] = handle_lpswe,
586 };
587
588 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
589 {
590 intercept_handler_t handler;
591
592 /*
593 * A lot of B2 instructions are priviledged. Here we check for
594 * the privileged ones, that we can handle in the kernel.
595 * Anything else goes to userspace.
596 */
597 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
598 if (handler)
599 return handler(vcpu);
600
601 return -EOPNOTSUPP;
602 }
603
604 static int handle_epsw(struct kvm_vcpu *vcpu)
605 {
606 int reg1, reg2;
607
608 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
609
610 /* This basically extracts the mask half of the psw. */
611 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
612 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
613 if (reg2) {
614 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
615 vcpu->run->s.regs.gprs[reg2] |=
616 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
617 }
618 return 0;
619 }
620
621 #define PFMF_RESERVED 0xfffc0101UL
622 #define PFMF_SK 0x00020000UL
623 #define PFMF_CF 0x00010000UL
624 #define PFMF_UI 0x00008000UL
625 #define PFMF_FSC 0x00007000UL
626 #define PFMF_NQ 0x00000800UL
627 #define PFMF_MR 0x00000400UL
628 #define PFMF_MC 0x00000200UL
629 #define PFMF_KEY 0x000000feUL
630
631 static int handle_pfmf(struct kvm_vcpu *vcpu)
632 {
633 int reg1, reg2;
634 unsigned long start, end;
635
636 vcpu->stat.instruction_pfmf++;
637
638 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
639
640 if (!MACHINE_HAS_PFMF)
641 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
642
643 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
644 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
645
646 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
647 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
648
649 /* Only provide non-quiescing support if the host supports it */
650 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
651 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
652
653 /* No support for conditional-SSKE */
654 if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
655 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
656
657 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
658 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
659 if (kvm_s390_check_low_addr_protection(vcpu, start))
660 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
661 }
662
663 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
664 case 0x00000000:
665 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
666 break;
667 case 0x00001000:
668 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
669 break;
670 /* We dont support EDAT2
671 case 0x00002000:
672 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
673 break;*/
674 default:
675 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
676 }
677 while (start < end) {
678 unsigned long useraddr, abs_addr;
679
680 /* Translate guest address to host address */
681 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
682 abs_addr = kvm_s390_real_to_abs(vcpu, start);
683 else
684 abs_addr = start;
685 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
686 if (kvm_is_error_hva(useraddr))
687 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
688
689 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
690 if (clear_user((void __user *)useraddr, PAGE_SIZE))
691 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
692 }
693
694 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
695 __skey_check_enable(vcpu);
696 if (set_guest_storage_key(current->mm, useraddr,
697 vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
698 vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
699 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
700 }
701
702 start += PAGE_SIZE;
703 }
704 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
705 vcpu->run->s.regs.gprs[reg2] = end;
706 return 0;
707 }
708
709 static int handle_essa(struct kvm_vcpu *vcpu)
710 {
711 /* entries expected to be 1FF */
712 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
713 unsigned long *cbrlo, cbrle;
714 struct gmap *gmap;
715 int i;
716
717 VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
718 gmap = vcpu->arch.gmap;
719 vcpu->stat.instruction_essa++;
720 if (!kvm_s390_cmma_enabled(vcpu->kvm))
721 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
722
723 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
724 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
725
726 if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
727 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
728
729 /* Rewind PSW to repeat the ESSA instruction */
730 vcpu->arch.sie_block->gpsw.addr =
731 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
732 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
733 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
734 down_read(&gmap->mm->mmap_sem);
735 for (i = 0; i < entries; ++i) {
736 cbrle = cbrlo[i];
737 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
738 /* invalid entry */
739 break;
740 /* try to free backing */
741 __gmap_zap(cbrle, gmap);
742 }
743 up_read(&gmap->mm->mmap_sem);
744 if (i < entries)
745 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
746 return 0;
747 }
748
749 static const intercept_handler_t b9_handlers[256] = {
750 [0x8a] = handle_ipte_interlock,
751 [0x8d] = handle_epsw,
752 [0x8e] = handle_ipte_interlock,
753 [0x8f] = handle_ipte_interlock,
754 [0xab] = handle_essa,
755 [0xaf] = handle_pfmf,
756 };
757
758 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
759 {
760 intercept_handler_t handler;
761
762 /* This is handled just as for the B2 instructions. */
763 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
764 if (handler)
765 return handler(vcpu);
766
767 return -EOPNOTSUPP;
768 }
769
770 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
771 {
772 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
773 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
774 u32 val = 0;
775 int reg, rc;
776 u64 ga;
777
778 vcpu->stat.instruction_lctl++;
779
780 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
781 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
782
783 ga = kvm_s390_get_base_disp_rs(vcpu);
784
785 if (ga & 3)
786 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
787
788 VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
789 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
790
791 reg = reg1;
792 do {
793 rc = read_guest(vcpu, ga, &val, sizeof(val));
794 if (rc)
795 return kvm_s390_inject_prog_cond(vcpu, rc);
796 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
797 vcpu->arch.sie_block->gcr[reg] |= val;
798 ga += 4;
799 if (reg == reg3)
800 break;
801 reg = (reg + 1) % 16;
802 } while (1);
803
804 return 0;
805 }
806
807 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
808 {
809 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
810 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
811 u64 ga;
812 u32 val;
813 int reg, rc;
814
815 vcpu->stat.instruction_stctl++;
816
817 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
818 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
819
820 ga = kvm_s390_get_base_disp_rs(vcpu);
821
822 if (ga & 3)
823 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
824
825 VCPU_EVENT(vcpu, 5, "stctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
826 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
827
828 reg = reg1;
829 do {
830 val = vcpu->arch.sie_block->gcr[reg] & 0x00000000fffffffful;
831 rc = write_guest(vcpu, ga, &val, sizeof(val));
832 if (rc)
833 return kvm_s390_inject_prog_cond(vcpu, rc);
834 ga += 4;
835 if (reg == reg3)
836 break;
837 reg = (reg + 1) % 16;
838 } while (1);
839
840 return 0;
841 }
842
843 static int handle_lctlg(struct kvm_vcpu *vcpu)
844 {
845 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
846 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
847 u64 ga, val;
848 int reg, rc;
849
850 vcpu->stat.instruction_lctlg++;
851
852 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
853 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
854
855 ga = kvm_s390_get_base_disp_rsy(vcpu);
856
857 if (ga & 7)
858 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
859
860 reg = reg1;
861
862 VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
863 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
864
865 do {
866 rc = read_guest(vcpu, ga, &val, sizeof(val));
867 if (rc)
868 return kvm_s390_inject_prog_cond(vcpu, rc);
869 vcpu->arch.sie_block->gcr[reg] = val;
870 ga += 8;
871 if (reg == reg3)
872 break;
873 reg = (reg + 1) % 16;
874 } while (1);
875
876 return 0;
877 }
878
879 static int handle_stctg(struct kvm_vcpu *vcpu)
880 {
881 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
882 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
883 u64 ga, val;
884 int reg, rc;
885
886 vcpu->stat.instruction_stctg++;
887
888 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
889 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
890
891 ga = kvm_s390_get_base_disp_rsy(vcpu);
892
893 if (ga & 7)
894 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
895
896 reg = reg1;
897
898 VCPU_EVENT(vcpu, 5, "stctg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
899 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
900
901 do {
902 val = vcpu->arch.sie_block->gcr[reg];
903 rc = write_guest(vcpu, ga, &val, sizeof(val));
904 if (rc)
905 return kvm_s390_inject_prog_cond(vcpu, rc);
906 ga += 8;
907 if (reg == reg3)
908 break;
909 reg = (reg + 1) % 16;
910 } while (1);
911
912 return 0;
913 }
914
915 static const intercept_handler_t eb_handlers[256] = {
916 [0x2f] = handle_lctlg,
917 [0x25] = handle_stctg,
918 };
919
920 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
921 {
922 intercept_handler_t handler;
923
924 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
925 if (handler)
926 return handler(vcpu);
927 return -EOPNOTSUPP;
928 }
929
930 static int handle_tprot(struct kvm_vcpu *vcpu)
931 {
932 u64 address1, address2;
933 unsigned long hva, gpa;
934 int ret = 0, cc = 0;
935 bool writable;
936
937 vcpu->stat.instruction_tprot++;
938
939 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
940 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
941
942 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
943
944 /* we only handle the Linux memory detection case:
945 * access key == 0
946 * everything else goes to userspace. */
947 if (address2 & 0xf0)
948 return -EOPNOTSUPP;
949 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
950 ipte_lock(vcpu);
951 ret = guest_translate_address(vcpu, address1, &gpa, 1);
952 if (ret == PGM_PROTECTION) {
953 /* Write protected? Try again with read-only... */
954 cc = 1;
955 ret = guest_translate_address(vcpu, address1, &gpa, 0);
956 }
957 if (ret) {
958 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
959 ret = kvm_s390_inject_program_int(vcpu, ret);
960 } else if (ret > 0) {
961 /* Translation not available */
962 kvm_s390_set_psw_cc(vcpu, 3);
963 ret = 0;
964 }
965 goto out_unlock;
966 }
967
968 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
969 if (kvm_is_error_hva(hva)) {
970 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
971 } else {
972 if (!writable)
973 cc = 1; /* Write not permitted ==> read-only */
974 kvm_s390_set_psw_cc(vcpu, cc);
975 /* Note: CC2 only occurs for storage keys (not supported yet) */
976 }
977 out_unlock:
978 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
979 ipte_unlock(vcpu);
980 return ret;
981 }
982
983 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
984 {
985 /* For e5xx... instructions we only handle TPROT */
986 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
987 return handle_tprot(vcpu);
988 return -EOPNOTSUPP;
989 }
990
991 static int handle_sckpf(struct kvm_vcpu *vcpu)
992 {
993 u32 value;
994
995 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
996 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
997
998 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
999 return kvm_s390_inject_program_int(vcpu,
1000 PGM_SPECIFICATION);
1001
1002 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1003 vcpu->arch.sie_block->todpr = value;
1004
1005 return 0;
1006 }
1007
1008 static const intercept_handler_t x01_handlers[256] = {
1009 [0x07] = handle_sckpf,
1010 };
1011
1012 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1013 {
1014 intercept_handler_t handler;
1015
1016 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1017 if (handler)
1018 return handler(vcpu);
1019 return -EOPNOTSUPP;
1020 }
Linux with added FPC-III support