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 */
handle_set_clock(struct kvm_vcpu * vcpu)34 static int handle_set_clock(struct kvm_vcpu *vcpu)
35 {
36 int rc;
37 ar_t ar;
38 u64 op2, val;
39
40 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
41 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
42
43 op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
44 if (op2 & 7) /* Operand must be on a doubleword boundary */
45 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
46 rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
47 if (rc)
48 return kvm_s390_inject_prog_cond(vcpu, rc);
49
50 VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
51 kvm_s390_set_tod_clock(vcpu->kvm, val);
52
53 kvm_s390_set_psw_cc(vcpu, 0);
54 return 0;
55 }
56
handle_set_prefix(struct kvm_vcpu * vcpu)57 static int handle_set_prefix(struct kvm_vcpu *vcpu)
58 {
59 u64 operand2;
60 u32 address;
61 int rc;
62 ar_t ar;
63
64 vcpu->stat.instruction_spx++;
65
66 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
67 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
68
69 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
70
71 /* must be word boundary */
72 if (operand2 & 3)
73 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
74
75 /* get the value */
76 rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
77 if (rc)
78 return kvm_s390_inject_prog_cond(vcpu, rc);
79
80 address &= 0x7fffe000u;
81
82 /*
83 * Make sure the new value is valid memory. We only need to check the
84 * first page, since address is 8k aligned and memory pieces are always
85 * at least 1MB aligned and have at least a size of 1MB.
86 */
87 if (kvm_is_error_gpa(vcpu->kvm, address))
88 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
89
90 kvm_s390_set_prefix(vcpu, address);
91 trace_kvm_s390_handle_prefix(vcpu, 1, address);
92 return 0;
93 }
94
handle_store_prefix(struct kvm_vcpu * vcpu)95 static int handle_store_prefix(struct kvm_vcpu *vcpu)
96 {
97 u64 operand2;
98 u32 address;
99 int rc;
100 ar_t ar;
101
102 vcpu->stat.instruction_stpx++;
103
104 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
105 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
106
107 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
108
109 /* must be word boundary */
110 if (operand2 & 3)
111 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
112
113 address = kvm_s390_get_prefix(vcpu);
114
115 /* get the value */
116 rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
117 if (rc)
118 return kvm_s390_inject_prog_cond(vcpu, rc);
119
120 VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
121 trace_kvm_s390_handle_prefix(vcpu, 0, address);
122 return 0;
123 }
124
handle_store_cpu_address(struct kvm_vcpu * vcpu)125 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
126 {
127 u16 vcpu_id = vcpu->vcpu_id;
128 u64 ga;
129 int rc;
130 ar_t ar;
131
132 vcpu->stat.instruction_stap++;
133
134 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
135 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
136
137 ga = kvm_s390_get_base_disp_s(vcpu, &ar);
138
139 if (ga & 1)
140 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
141
142 rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
143 if (rc)
144 return kvm_s390_inject_prog_cond(vcpu, rc);
145
146 VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
147 trace_kvm_s390_handle_stap(vcpu, ga);
148 return 0;
149 }
150
__skey_check_enable(struct kvm_vcpu * vcpu)151 static int __skey_check_enable(struct kvm_vcpu *vcpu)
152 {
153 int rc = 0;
154 if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
155 return rc;
156
157 rc = s390_enable_skey();
158 VCPU_EVENT(vcpu, 3, "%s", "enabling storage keys for guest");
159 trace_kvm_s390_skey_related_inst(vcpu);
160 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
161 return rc;
162 }
163
164
handle_skey(struct kvm_vcpu * vcpu)165 static int handle_skey(struct kvm_vcpu *vcpu)
166 {
167 int rc = __skey_check_enable(vcpu);
168
169 if (rc)
170 return rc;
171 vcpu->stat.instruction_storage_key++;
172
173 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
174 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
175
176 kvm_s390_rewind_psw(vcpu, 4);
177 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
178 return 0;
179 }
180
handle_ipte_interlock(struct kvm_vcpu * vcpu)181 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
182 {
183 vcpu->stat.instruction_ipte_interlock++;
184 if (psw_bits(vcpu->arch.sie_block->gpsw).p)
185 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
186 wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
187 kvm_s390_rewind_psw(vcpu, 4);
188 VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
189 return 0;
190 }
191
handle_test_block(struct kvm_vcpu * vcpu)192 static int handle_test_block(struct kvm_vcpu *vcpu)
193 {
194 gpa_t addr;
195 int reg2;
196
197 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
198 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
199
200 kvm_s390_get_regs_rre(vcpu, NULL, ®2);
201 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
202 addr = kvm_s390_logical_to_effective(vcpu, addr);
203 if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
204 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
205 addr = kvm_s390_real_to_abs(vcpu, addr);
206
207 if (kvm_is_error_gpa(vcpu->kvm, addr))
208 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
209 /*
210 * We don't expect errors on modern systems, and do not care
211 * about storage keys (yet), so let's just clear the page.
212 */
213 if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
214 return -EFAULT;
215 kvm_s390_set_psw_cc(vcpu, 0);
216 vcpu->run->s.regs.gprs[0] = 0;
217 return 0;
218 }
219
handle_tpi(struct kvm_vcpu * vcpu)220 static int handle_tpi(struct kvm_vcpu *vcpu)
221 {
222 struct kvm_s390_interrupt_info *inti;
223 unsigned long len;
224 u32 tpi_data[3];
225 int rc;
226 u64 addr;
227 ar_t ar;
228
229 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
230 if (addr & 3)
231 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
232
233 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
234 if (!inti) {
235 kvm_s390_set_psw_cc(vcpu, 0);
236 return 0;
237 }
238
239 tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
240 tpi_data[1] = inti->io.io_int_parm;
241 tpi_data[2] = inti->io.io_int_word;
242 if (addr) {
243 /*
244 * Store the two-word I/O interruption code into the
245 * provided area.
246 */
247 len = sizeof(tpi_data) - 4;
248 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
249 if (rc) {
250 rc = kvm_s390_inject_prog_cond(vcpu, rc);
251 goto reinject_interrupt;
252 }
253 } else {
254 /*
255 * Store the three-word I/O interruption code into
256 * the appropriate lowcore area.
257 */
258 len = sizeof(tpi_data);
259 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
260 /* failed writes to the low core are not recoverable */
261 rc = -EFAULT;
262 goto reinject_interrupt;
263 }
264 }
265
266 /* irq was successfully handed to the guest */
267 kfree(inti);
268 kvm_s390_set_psw_cc(vcpu, 1);
269 return 0;
270 reinject_interrupt:
271 /*
272 * If we encounter a problem storing the interruption code, the
273 * instruction is suppressed from the guest's view: reinject the
274 * interrupt.
275 */
276 if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
277 kfree(inti);
278 rc = -EFAULT;
279 }
280 /* don't set the cc, a pgm irq was injected or we drop to user space */
281 return rc ? -EFAULT : 0;
282 }
283
handle_tsch(struct kvm_vcpu * vcpu)284 static int handle_tsch(struct kvm_vcpu *vcpu)
285 {
286 struct kvm_s390_interrupt_info *inti = NULL;
287 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
288
289 /* a valid schid has at least one bit set */
290 if (vcpu->run->s.regs.gprs[1])
291 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
292 vcpu->run->s.regs.gprs[1]);
293
294 /*
295 * Prepare exit to userspace.
296 * We indicate whether we dequeued a pending I/O interrupt
297 * so that userspace can re-inject it if the instruction gets
298 * a program check. While this may re-order the pending I/O
299 * interrupts, this is no problem since the priority is kept
300 * intact.
301 */
302 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
303 vcpu->run->s390_tsch.dequeued = !!inti;
304 if (inti) {
305 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
306 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
307 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
308 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
309 }
310 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
311 kfree(inti);
312 return -EREMOTE;
313 }
314
handle_io_inst(struct kvm_vcpu * vcpu)315 static int handle_io_inst(struct kvm_vcpu *vcpu)
316 {
317 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
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 if (vcpu->kvm->arch.css_support) {
323 /*
324 * Most I/O instructions will be handled by userspace.
325 * Exceptions are tpi and the interrupt portion of tsch.
326 */
327 if (vcpu->arch.sie_block->ipa == 0xb236)
328 return handle_tpi(vcpu);
329 if (vcpu->arch.sie_block->ipa == 0xb235)
330 return handle_tsch(vcpu);
331 /* Handle in userspace. */
332 return -EOPNOTSUPP;
333 } else {
334 /*
335 * Set condition code 3 to stop the guest from issuing channel
336 * I/O instructions.
337 */
338 kvm_s390_set_psw_cc(vcpu, 3);
339 return 0;
340 }
341 }
342
handle_stfl(struct kvm_vcpu * vcpu)343 static int handle_stfl(struct kvm_vcpu *vcpu)
344 {
345 int rc;
346 unsigned int fac;
347
348 vcpu->stat.instruction_stfl++;
349
350 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
351 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
352
353 /*
354 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
355 * into a u32 memory representation. They will remain bits 0-31.
356 */
357 fac = *vcpu->kvm->arch.model.fac->list >> 32;
358 rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
359 &fac, sizeof(fac));
360 if (rc)
361 return rc;
362 VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
363 trace_kvm_s390_handle_stfl(vcpu, fac);
364 return 0;
365 }
366
367 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
368 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
369 #define PSW_ADDR_24 0x0000000000ffffffUL
370 #define PSW_ADDR_31 0x000000007fffffffUL
371
is_valid_psw(psw_t * psw)372 int is_valid_psw(psw_t *psw)
373 {
374 if (psw->mask & PSW_MASK_UNASSIGNED)
375 return 0;
376 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
377 if (psw->addr & ~PSW_ADDR_31)
378 return 0;
379 }
380 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
381 return 0;
382 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
383 return 0;
384 if (psw->addr & 1)
385 return 0;
386 return 1;
387 }
388
kvm_s390_handle_lpsw(struct kvm_vcpu * vcpu)389 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
390 {
391 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
392 psw_compat_t new_psw;
393 u64 addr;
394 int rc;
395 ar_t ar;
396
397 if (gpsw->mask & PSW_MASK_PSTATE)
398 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
399
400 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
401 if (addr & 7)
402 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
403
404 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
405 if (rc)
406 return kvm_s390_inject_prog_cond(vcpu, rc);
407 if (!(new_psw.mask & PSW32_MASK_BASE))
408 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
409 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
410 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
411 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
412 if (!is_valid_psw(gpsw))
413 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
414 return 0;
415 }
416
handle_lpswe(struct kvm_vcpu * vcpu)417 static int handle_lpswe(struct kvm_vcpu *vcpu)
418 {
419 psw_t new_psw;
420 u64 addr;
421 int rc;
422 ar_t ar;
423
424 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
425 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
426
427 addr = kvm_s390_get_base_disp_s(vcpu, &ar);
428 if (addr & 7)
429 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
430 rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
431 if (rc)
432 return kvm_s390_inject_prog_cond(vcpu, rc);
433 vcpu->arch.sie_block->gpsw = new_psw;
434 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
435 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
436 return 0;
437 }
438
handle_stidp(struct kvm_vcpu * vcpu)439 static int handle_stidp(struct kvm_vcpu *vcpu)
440 {
441 u64 stidp_data = vcpu->arch.stidp_data;
442 u64 operand2;
443 int rc;
444 ar_t ar;
445
446 vcpu->stat.instruction_stidp++;
447
448 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
449 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
450
451 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
452
453 if (operand2 & 7)
454 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
455
456 rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
457 if (rc)
458 return kvm_s390_inject_prog_cond(vcpu, rc);
459
460 VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
461 return 0;
462 }
463
handle_stsi_3_2_2(struct kvm_vcpu * vcpu,struct sysinfo_3_2_2 * mem)464 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
465 {
466 int cpus = 0;
467 int n;
468
469 cpus = atomic_read(&vcpu->kvm->online_vcpus);
470
471 /* deal with other level 3 hypervisors */
472 if (stsi(mem, 3, 2, 2))
473 mem->count = 0;
474 if (mem->count < 8)
475 mem->count++;
476 for (n = mem->count - 1; n > 0 ; n--)
477 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
478
479 memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
480 mem->vm[0].cpus_total = cpus;
481 mem->vm[0].cpus_configured = cpus;
482 mem->vm[0].cpus_standby = 0;
483 mem->vm[0].cpus_reserved = 0;
484 mem->vm[0].caf = 1000;
485 memcpy(mem->vm[0].name, "KVMguest", 8);
486 ASCEBC(mem->vm[0].name, 8);
487 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
488 ASCEBC(mem->vm[0].cpi, 16);
489 }
490
insert_stsi_usr_data(struct kvm_vcpu * vcpu,u64 addr,ar_t ar,u8 fc,u8 sel1,u16 sel2)491 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
492 u8 fc, u8 sel1, u16 sel2)
493 {
494 vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
495 vcpu->run->s390_stsi.addr = addr;
496 vcpu->run->s390_stsi.ar = ar;
497 vcpu->run->s390_stsi.fc = fc;
498 vcpu->run->s390_stsi.sel1 = sel1;
499 vcpu->run->s390_stsi.sel2 = sel2;
500 }
501
handle_stsi(struct kvm_vcpu * vcpu)502 static int handle_stsi(struct kvm_vcpu *vcpu)
503 {
504 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
505 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
506 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
507 unsigned long mem = 0;
508 u64 operand2;
509 int rc = 0;
510 ar_t ar;
511
512 vcpu->stat.instruction_stsi++;
513 VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
514
515 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
516 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
517
518 if (fc > 3) {
519 kvm_s390_set_psw_cc(vcpu, 3);
520 return 0;
521 }
522
523 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
524 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
525 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
526
527 if (fc == 0) {
528 vcpu->run->s.regs.gprs[0] = 3 << 28;
529 kvm_s390_set_psw_cc(vcpu, 0);
530 return 0;
531 }
532
533 operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
534
535 if (operand2 & 0xfff)
536 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
537
538 switch (fc) {
539 case 1: /* same handling for 1 and 2 */
540 case 2:
541 mem = get_zeroed_page(GFP_KERNEL);
542 if (!mem)
543 goto out_no_data;
544 if (stsi((void *) mem, fc, sel1, sel2))
545 goto out_no_data;
546 break;
547 case 3:
548 if (sel1 != 2 || sel2 != 2)
549 goto out_no_data;
550 mem = get_zeroed_page(GFP_KERNEL);
551 if (!mem)
552 goto out_no_data;
553 handle_stsi_3_2_2(vcpu, (void *) mem);
554 break;
555 }
556
557 rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
558 if (rc) {
559 rc = kvm_s390_inject_prog_cond(vcpu, rc);
560 goto out;
561 }
562 if (vcpu->kvm->arch.user_stsi) {
563 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
564 rc = -EREMOTE;
565 }
566 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
567 free_page(mem);
568 kvm_s390_set_psw_cc(vcpu, 0);
569 vcpu->run->s.regs.gprs[0] = 0;
570 return rc;
571 out_no_data:
572 kvm_s390_set_psw_cc(vcpu, 3);
573 out:
574 free_page(mem);
575 return rc;
576 }
577
578 static const intercept_handler_t b2_handlers[256] = {
579 [0x02] = handle_stidp,
580 [0x04] = handle_set_clock,
581 [0x10] = handle_set_prefix,
582 [0x11] = handle_store_prefix,
583 [0x12] = handle_store_cpu_address,
584 [0x21] = handle_ipte_interlock,
585 [0x29] = handle_skey,
586 [0x2a] = handle_skey,
587 [0x2b] = handle_skey,
588 [0x2c] = handle_test_block,
589 [0x30] = handle_io_inst,
590 [0x31] = handle_io_inst,
591 [0x32] = handle_io_inst,
592 [0x33] = handle_io_inst,
593 [0x34] = handle_io_inst,
594 [0x35] = handle_io_inst,
595 [0x36] = handle_io_inst,
596 [0x37] = handle_io_inst,
597 [0x38] = handle_io_inst,
598 [0x39] = handle_io_inst,
599 [0x3a] = handle_io_inst,
600 [0x3b] = handle_io_inst,
601 [0x3c] = handle_io_inst,
602 [0x50] = handle_ipte_interlock,
603 [0x5f] = handle_io_inst,
604 [0x74] = handle_io_inst,
605 [0x76] = handle_io_inst,
606 [0x7d] = handle_stsi,
607 [0xb1] = handle_stfl,
608 [0xb2] = handle_lpswe,
609 };
610
kvm_s390_handle_b2(struct kvm_vcpu * vcpu)611 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
612 {
613 intercept_handler_t handler;
614
615 /*
616 * A lot of B2 instructions are priviledged. Here we check for
617 * the privileged ones, that we can handle in the kernel.
618 * Anything else goes to userspace.
619 */
620 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
621 if (handler)
622 return handler(vcpu);
623
624 return -EOPNOTSUPP;
625 }
626
handle_epsw(struct kvm_vcpu * vcpu)627 static int handle_epsw(struct kvm_vcpu *vcpu)
628 {
629 int reg1, reg2;
630
631 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
632
633 /* This basically extracts the mask half of the psw. */
634 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
635 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
636 if (reg2) {
637 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
638 vcpu->run->s.regs.gprs[reg2] |=
639 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
640 }
641 return 0;
642 }
643
644 #define PFMF_RESERVED 0xfffc0101UL
645 #define PFMF_SK 0x00020000UL
646 #define PFMF_CF 0x00010000UL
647 #define PFMF_UI 0x00008000UL
648 #define PFMF_FSC 0x00007000UL
649 #define PFMF_NQ 0x00000800UL
650 #define PFMF_MR 0x00000400UL
651 #define PFMF_MC 0x00000200UL
652 #define PFMF_KEY 0x000000feUL
653
handle_pfmf(struct kvm_vcpu * vcpu)654 static int handle_pfmf(struct kvm_vcpu *vcpu)
655 {
656 int reg1, reg2;
657 unsigned long start, end;
658
659 vcpu->stat.instruction_pfmf++;
660
661 kvm_s390_get_regs_rre(vcpu, ®1, ®2);
662
663 if (!test_kvm_facility(vcpu->kvm, 8))
664 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
665
666 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
667 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
668
669 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
670 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
671
672 /* Only provide non-quiescing support if the host supports it */
673 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
674 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
675
676 /* No support for conditional-SSKE */
677 if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
678 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
679
680 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
681 start = kvm_s390_logical_to_effective(vcpu, start);
682
683 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
684 case 0x00000000:
685 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
686 break;
687 case 0x00001000:
688 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
689 break;
690 case 0x00002000:
691 /* only support 2G frame size if EDAT2 is available and we are
692 not in 24-bit addressing mode */
693 if (!test_kvm_facility(vcpu->kvm, 78) ||
694 psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
695 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
696 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
697 break;
698 default:
699 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
700 }
701
702 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
703 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
704 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
705 }
706
707 while (start < end) {
708 unsigned long useraddr, abs_addr;
709
710 /* Translate guest address to host address */
711 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
712 abs_addr = kvm_s390_real_to_abs(vcpu, start);
713 else
714 abs_addr = start;
715 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
716 if (kvm_is_error_hva(useraddr))
717 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
718
719 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
720 if (clear_user((void __user *)useraddr, PAGE_SIZE))
721 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
722 }
723
724 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
725 int rc = __skey_check_enable(vcpu);
726
727 if (rc)
728 return rc;
729 if (set_guest_storage_key(current->mm, useraddr,
730 vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
731 vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
732 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
733 }
734
735 start += PAGE_SIZE;
736 }
737 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
738 vcpu->run->s.regs.gprs[reg2] = end;
739 return 0;
740 }
741
handle_essa(struct kvm_vcpu * vcpu)742 static int handle_essa(struct kvm_vcpu *vcpu)
743 {
744 /* entries expected to be 1FF */
745 int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
746 unsigned long *cbrlo, cbrle;
747 struct gmap *gmap;
748 int i;
749
750 VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
751 gmap = vcpu->arch.gmap;
752 vcpu->stat.instruction_essa++;
753 if (!vcpu->kvm->arch.use_cmma)
754 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
755
756 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
757 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
758
759 if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
760 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
761
762 /* Rewind PSW to repeat the ESSA instruction */
763 kvm_s390_rewind_psw(vcpu, 4);
764 vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
765 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
766 down_read(&gmap->mm->mmap_sem);
767 for (i = 0; i < entries; ++i) {
768 cbrle = cbrlo[i];
769 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
770 /* invalid entry */
771 break;
772 /* try to free backing */
773 __gmap_zap(gmap, cbrle);
774 }
775 up_read(&gmap->mm->mmap_sem);
776 if (i < entries)
777 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
778 return 0;
779 }
780
781 static const intercept_handler_t b9_handlers[256] = {
782 [0x8a] = handle_ipte_interlock,
783 [0x8d] = handle_epsw,
784 [0x8e] = handle_ipte_interlock,
785 [0x8f] = handle_ipte_interlock,
786 [0xab] = handle_essa,
787 [0xaf] = handle_pfmf,
788 };
789
kvm_s390_handle_b9(struct kvm_vcpu * vcpu)790 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
791 {
792 intercept_handler_t handler;
793
794 /* This is handled just as for the B2 instructions. */
795 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
796 if (handler)
797 return handler(vcpu);
798
799 return -EOPNOTSUPP;
800 }
801
kvm_s390_handle_lctl(struct kvm_vcpu * vcpu)802 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
803 {
804 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
805 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
806 int reg, rc, nr_regs;
807 u32 ctl_array[16];
808 u64 ga;
809 ar_t ar;
810
811 vcpu->stat.instruction_lctl++;
812
813 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
814 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
815
816 ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
817
818 if (ga & 3)
819 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
820
821 VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
822 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
823
824 nr_regs = ((reg3 - reg1) & 0xf) + 1;
825 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
826 if (rc)
827 return kvm_s390_inject_prog_cond(vcpu, rc);
828 reg = reg1;
829 nr_regs = 0;
830 do {
831 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
832 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
833 if (reg == reg3)
834 break;
835 reg = (reg + 1) % 16;
836 } while (1);
837 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
838 return 0;
839 }
840
kvm_s390_handle_stctl(struct kvm_vcpu * vcpu)841 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
842 {
843 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
844 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
845 int reg, rc, nr_regs;
846 u32 ctl_array[16];
847 u64 ga;
848 ar_t ar;
849
850 vcpu->stat.instruction_stctl++;
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_rs(vcpu, &ar);
856
857 if (ga & 3)
858 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
859
860 VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
861 trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
862
863 reg = reg1;
864 nr_regs = 0;
865 do {
866 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
867 if (reg == reg3)
868 break;
869 reg = (reg + 1) % 16;
870 } while (1);
871 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
872 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
873 }
874
handle_lctlg(struct kvm_vcpu * vcpu)875 static int handle_lctlg(struct kvm_vcpu *vcpu)
876 {
877 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
878 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
879 int reg, rc, nr_regs;
880 u64 ctl_array[16];
881 u64 ga;
882 ar_t ar;
883
884 vcpu->stat.instruction_lctlg++;
885
886 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
887 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
888
889 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
890
891 if (ga & 7)
892 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
893
894 VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
895 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
896
897 nr_regs = ((reg3 - reg1) & 0xf) + 1;
898 rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
899 if (rc)
900 return kvm_s390_inject_prog_cond(vcpu, rc);
901 reg = reg1;
902 nr_regs = 0;
903 do {
904 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
905 if (reg == reg3)
906 break;
907 reg = (reg + 1) % 16;
908 } while (1);
909 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
910 return 0;
911 }
912
handle_stctg(struct kvm_vcpu * vcpu)913 static int handle_stctg(struct kvm_vcpu *vcpu)
914 {
915 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
916 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
917 int reg, rc, nr_regs;
918 u64 ctl_array[16];
919 u64 ga;
920 ar_t ar;
921
922 vcpu->stat.instruction_stctg++;
923
924 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
925 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
926
927 ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
928
929 if (ga & 7)
930 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
931
932 VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
933 trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
934
935 reg = reg1;
936 nr_regs = 0;
937 do {
938 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
939 if (reg == reg3)
940 break;
941 reg = (reg + 1) % 16;
942 } while (1);
943 rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
944 return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
945 }
946
947 static const intercept_handler_t eb_handlers[256] = {
948 [0x2f] = handle_lctlg,
949 [0x25] = handle_stctg,
950 };
951
kvm_s390_handle_eb(struct kvm_vcpu * vcpu)952 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
953 {
954 intercept_handler_t handler;
955
956 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
957 if (handler)
958 return handler(vcpu);
959 return -EOPNOTSUPP;
960 }
961
handle_tprot(struct kvm_vcpu * vcpu)962 static int handle_tprot(struct kvm_vcpu *vcpu)
963 {
964 u64 address1, address2;
965 unsigned long hva, gpa;
966 int ret = 0, cc = 0;
967 bool writable;
968 ar_t ar;
969
970 vcpu->stat.instruction_tprot++;
971
972 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
973 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
974
975 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
976
977 /* we only handle the Linux memory detection case:
978 * access key == 0
979 * everything else goes to userspace. */
980 if (address2 & 0xf0)
981 return -EOPNOTSUPP;
982 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
983 ipte_lock(vcpu);
984 ret = guest_translate_address(vcpu, address1, ar, &gpa, 1);
985 if (ret == PGM_PROTECTION) {
986 /* Write protected? Try again with read-only... */
987 cc = 1;
988 ret = guest_translate_address(vcpu, address1, ar, &gpa, 0);
989 }
990 if (ret) {
991 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
992 ret = kvm_s390_inject_program_int(vcpu, ret);
993 } else if (ret > 0) {
994 /* Translation not available */
995 kvm_s390_set_psw_cc(vcpu, 3);
996 ret = 0;
997 }
998 goto out_unlock;
999 }
1000
1001 hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1002 if (kvm_is_error_hva(hva)) {
1003 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1004 } else {
1005 if (!writable)
1006 cc = 1; /* Write not permitted ==> read-only */
1007 kvm_s390_set_psw_cc(vcpu, cc);
1008 /* Note: CC2 only occurs for storage keys (not supported yet) */
1009 }
1010 out_unlock:
1011 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1012 ipte_unlock(vcpu);
1013 return ret;
1014 }
1015
kvm_s390_handle_e5(struct kvm_vcpu * vcpu)1016 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1017 {
1018 /* For e5xx... instructions we only handle TPROT */
1019 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1020 return handle_tprot(vcpu);
1021 return -EOPNOTSUPP;
1022 }
1023
handle_sckpf(struct kvm_vcpu * vcpu)1024 static int handle_sckpf(struct kvm_vcpu *vcpu)
1025 {
1026 u32 value;
1027
1028 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1029 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1030
1031 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1032 return kvm_s390_inject_program_int(vcpu,
1033 PGM_SPECIFICATION);
1034
1035 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1036 vcpu->arch.sie_block->todpr = value;
1037
1038 return 0;
1039 }
1040
1041 static const intercept_handler_t x01_handlers[256] = {
1042 [0x07] = handle_sckpf,
1043 };
1044
kvm_s390_handle_01(struct kvm_vcpu * vcpu)1045 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1046 {
1047 intercept_handler_t handler;
1048
1049 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1050 if (handler)
1051 return handler(vcpu);
1052 return -EOPNOTSUPP;
1053 }
1054