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TOMOYO Linux Cross Reference
Linux/arch/s390/kvm/priv.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * handling privileged instructions
  4  *
  5  * Copyright IBM Corp. 2008, 2018
  6  *
  7  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  8  *               Christian Borntraeger <borntraeger@de.ibm.com>
  9  */
 10 
 11 #include <linux/kvm.h>
 12 #include <linux/gfp.h>
 13 #include <linux/errno.h>
 14 #include <linux/compat.h>
 15 #include <linux/mm_types.h>
 16 
 17 #include <asm/asm-offsets.h>
 18 #include <asm/facility.h>
 19 #include <asm/current.h>
 20 #include <asm/debug.h>
 21 #include <asm/ebcdic.h>
 22 #include <asm/sysinfo.h>
 23 #include <asm/pgtable.h>
 24 #include <asm/page-states.h>
 25 #include <asm/pgalloc.h>
 26 #include <asm/gmap.h>
 27 #include <asm/io.h>
 28 #include <asm/ptrace.h>
 29 #include <asm/compat.h>
 30 #include <asm/sclp.h>
 31 #include "gaccess.h"
 32 #include "kvm-s390.h"
 33 #include "trace.h"
 34 
 35 static int handle_ri(struct kvm_vcpu *vcpu)
 36 {
 37         vcpu->stat.instruction_ri++;
 38 
 39         if (test_kvm_facility(vcpu->kvm, 64)) {
 40                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (lazy)");
 41                 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
 42                 kvm_s390_retry_instr(vcpu);
 43                 return 0;
 44         } else
 45                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 46 }
 47 
 48 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
 49 {
 50         if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
 51                 return handle_ri(vcpu);
 52         else
 53                 return -EOPNOTSUPP;
 54 }
 55 
 56 static int handle_gs(struct kvm_vcpu *vcpu)
 57 {
 58         vcpu->stat.instruction_gs++;
 59 
 60         if (test_kvm_facility(vcpu->kvm, 133)) {
 61                 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)");
 62                 preempt_disable();
 63                 __ctl_set_bit(2, 4);
 64                 current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb;
 65                 restore_gs_cb(current->thread.gs_cb);
 66                 preempt_enable();
 67                 vcpu->arch.sie_block->ecb |= ECB_GS;
 68                 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
 69                 vcpu->arch.gs_enabled = 1;
 70                 kvm_s390_retry_instr(vcpu);
 71                 return 0;
 72         } else
 73                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
 74 }
 75 
 76 int kvm_s390_handle_e3(struct kvm_vcpu *vcpu)
 77 {
 78         int code = vcpu->arch.sie_block->ipb & 0xff;
 79 
 80         if (code == 0x49 || code == 0x4d)
 81                 return handle_gs(vcpu);
 82         else
 83                 return -EOPNOTSUPP;
 84 }
 85 /* Handle SCK (SET CLOCK) interception */
 86 static int handle_set_clock(struct kvm_vcpu *vcpu)
 87 {
 88         struct kvm_s390_vm_tod_clock gtod = { 0 };
 89         int rc;
 90         u8 ar;
 91         u64 op2;
 92 
 93         vcpu->stat.instruction_sck++;
 94 
 95         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 96                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 97 
 98         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 99         if (op2 & 7)    /* Operand must be on a doubleword boundary */
100                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
101         rc = read_guest(vcpu, op2, ar, &gtod.tod, sizeof(gtod.tod));
102         if (rc)
103                 return kvm_s390_inject_prog_cond(vcpu, rc);
104 
105         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", gtod.tod);
106         kvm_s390_set_tod_clock(vcpu->kvm, &gtod);
107 
108         kvm_s390_set_psw_cc(vcpu, 0);
109         return 0;
110 }
111 
112 static int handle_set_prefix(struct kvm_vcpu *vcpu)
113 {
114         u64 operand2;
115         u32 address;
116         int rc;
117         u8 ar;
118 
119         vcpu->stat.instruction_spx++;
120 
121         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
122                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
123 
124         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
125 
126         /* must be word boundary */
127         if (operand2 & 3)
128                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
129 
130         /* get the value */
131         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
132         if (rc)
133                 return kvm_s390_inject_prog_cond(vcpu, rc);
134 
135         address &= 0x7fffe000u;
136 
137         /*
138          * Make sure the new value is valid memory. We only need to check the
139          * first page, since address is 8k aligned and memory pieces are always
140          * at least 1MB aligned and have at least a size of 1MB.
141          */
142         if (kvm_is_error_gpa(vcpu->kvm, address))
143                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
144 
145         kvm_s390_set_prefix(vcpu, address);
146         trace_kvm_s390_handle_prefix(vcpu, 1, address);
147         return 0;
148 }
149 
150 static int handle_store_prefix(struct kvm_vcpu *vcpu)
151 {
152         u64 operand2;
153         u32 address;
154         int rc;
155         u8 ar;
156 
157         vcpu->stat.instruction_stpx++;
158 
159         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
160                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
161 
162         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
163 
164         /* must be word boundary */
165         if (operand2 & 3)
166                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
167 
168         address = kvm_s390_get_prefix(vcpu);
169 
170         /* get the value */
171         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
172         if (rc)
173                 return kvm_s390_inject_prog_cond(vcpu, rc);
174 
175         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
176         trace_kvm_s390_handle_prefix(vcpu, 0, address);
177         return 0;
178 }
179 
180 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
181 {
182         u16 vcpu_id = vcpu->vcpu_id;
183         u64 ga;
184         int rc;
185         u8 ar;
186 
187         vcpu->stat.instruction_stap++;
188 
189         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
190                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
191 
192         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
193 
194         if (ga & 1)
195                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
196 
197         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
198         if (rc)
199                 return kvm_s390_inject_prog_cond(vcpu, rc);
200 
201         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
202         trace_kvm_s390_handle_stap(vcpu, ga);
203         return 0;
204 }
205 
206 int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
207 {
208         int rc = 0;
209         struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
210 
211         trace_kvm_s390_skey_related_inst(vcpu);
212         if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) &&
213             !kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
214                 return rc;
215 
216         rc = s390_enable_skey();
217         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
218         if (!rc) {
219                 if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
220                         kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
221                 else
222                         sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE |
223                                              ICTL_RRBE);
224         }
225         return rc;
226 }
227 
228 static int try_handle_skey(struct kvm_vcpu *vcpu)
229 {
230         int rc;
231 
232         rc = kvm_s390_skey_check_enable(vcpu);
233         if (rc)
234                 return rc;
235         if (sclp.has_skey) {
236                 /* with storage-key facility, SIE interprets it for us */
237                 kvm_s390_retry_instr(vcpu);
238                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
239                 return -EAGAIN;
240         }
241         return 0;
242 }
243 
244 static int handle_iske(struct kvm_vcpu *vcpu)
245 {
246         unsigned long addr;
247         unsigned char key;
248         int reg1, reg2;
249         int rc;
250 
251         vcpu->stat.instruction_iske++;
252 
253         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
254                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
255 
256         rc = try_handle_skey(vcpu);
257         if (rc)
258                 return rc != -EAGAIN ? rc : 0;
259 
260         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
261 
262         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
263         addr = kvm_s390_logical_to_effective(vcpu, addr);
264         addr = kvm_s390_real_to_abs(vcpu, addr);
265         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
266         if (kvm_is_error_hva(addr))
267                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
268 
269         down_read(&current->mm->mmap_sem);
270         rc = get_guest_storage_key(current->mm, addr, &key);
271         up_read(&current->mm->mmap_sem);
272         if (rc)
273                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
274         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
275         vcpu->run->s.regs.gprs[reg1] |= key;
276         return 0;
277 }
278 
279 static int handle_rrbe(struct kvm_vcpu *vcpu)
280 {
281         unsigned long addr;
282         int reg1, reg2;
283         int rc;
284 
285         vcpu->stat.instruction_rrbe++;
286 
287         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
288                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
289 
290         rc = try_handle_skey(vcpu);
291         if (rc)
292                 return rc != -EAGAIN ? rc : 0;
293 
294         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
295 
296         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
297         addr = kvm_s390_logical_to_effective(vcpu, addr);
298         addr = kvm_s390_real_to_abs(vcpu, addr);
299         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
300         if (kvm_is_error_hva(addr))
301                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
302 
303         down_read(&current->mm->mmap_sem);
304         rc = reset_guest_reference_bit(current->mm, addr);
305         up_read(&current->mm->mmap_sem);
306         if (rc < 0)
307                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
308 
309         kvm_s390_set_psw_cc(vcpu, rc);
310         return 0;
311 }
312 
313 #define SSKE_NQ 0x8
314 #define SSKE_MR 0x4
315 #define SSKE_MC 0x2
316 #define SSKE_MB 0x1
317 static int handle_sske(struct kvm_vcpu *vcpu)
318 {
319         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
320         unsigned long start, end;
321         unsigned char key, oldkey;
322         int reg1, reg2;
323         int rc;
324 
325         vcpu->stat.instruction_sske++;
326 
327         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
328                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
329 
330         rc = try_handle_skey(vcpu);
331         if (rc)
332                 return rc != -EAGAIN ? rc : 0;
333 
334         if (!test_kvm_facility(vcpu->kvm, 8))
335                 m3 &= ~SSKE_MB;
336         if (!test_kvm_facility(vcpu->kvm, 10))
337                 m3 &= ~(SSKE_MC | SSKE_MR);
338         if (!test_kvm_facility(vcpu->kvm, 14))
339                 m3 &= ~SSKE_NQ;
340 
341         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
342 
343         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
344         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
345         start = kvm_s390_logical_to_effective(vcpu, start);
346         if (m3 & SSKE_MB) {
347                 /* start already designates an absolute address */
348                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
349         } else {
350                 start = kvm_s390_real_to_abs(vcpu, start);
351                 end = start + PAGE_SIZE;
352         }
353 
354         while (start != end) {
355                 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
356 
357                 if (kvm_is_error_hva(addr))
358                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
359 
360                 down_read(&current->mm->mmap_sem);
361                 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
362                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
363                                                 m3 & SSKE_MC);
364                 up_read(&current->mm->mmap_sem);
365                 if (rc < 0)
366                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
367                 start += PAGE_SIZE;
368         }
369 
370         if (m3 & (SSKE_MC | SSKE_MR)) {
371                 if (m3 & SSKE_MB) {
372                         /* skey in reg1 is unpredictable */
373                         kvm_s390_set_psw_cc(vcpu, 3);
374                 } else {
375                         kvm_s390_set_psw_cc(vcpu, rc);
376                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
377                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
378                 }
379         }
380         if (m3 & SSKE_MB) {
381                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
382                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
383                 else
384                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
385                 end = kvm_s390_logical_to_effective(vcpu, end);
386                 vcpu->run->s.regs.gprs[reg2] |= end;
387         }
388         return 0;
389 }
390 
391 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
392 {
393         vcpu->stat.instruction_ipte_interlock++;
394         if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
395                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
396         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
397         kvm_s390_retry_instr(vcpu);
398         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
399         return 0;
400 }
401 
402 static int handle_test_block(struct kvm_vcpu *vcpu)
403 {
404         gpa_t addr;
405         int reg2;
406 
407         vcpu->stat.instruction_tb++;
408 
409         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
410                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
411 
412         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
413         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
414         addr = kvm_s390_logical_to_effective(vcpu, addr);
415         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
416                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
417         addr = kvm_s390_real_to_abs(vcpu, addr);
418 
419         if (kvm_is_error_gpa(vcpu->kvm, addr))
420                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
421         /*
422          * We don't expect errors on modern systems, and do not care
423          * about storage keys (yet), so let's just clear the page.
424          */
425         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
426                 return -EFAULT;
427         kvm_s390_set_psw_cc(vcpu, 0);
428         vcpu->run->s.regs.gprs[0] = 0;
429         return 0;
430 }
431 
432 static int handle_tpi(struct kvm_vcpu *vcpu)
433 {
434         struct kvm_s390_interrupt_info *inti;
435         unsigned long len;
436         u32 tpi_data[3];
437         int rc;
438         u64 addr;
439         u8 ar;
440 
441         vcpu->stat.instruction_tpi++;
442 
443         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
444         if (addr & 3)
445                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
446 
447         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
448         if (!inti) {
449                 kvm_s390_set_psw_cc(vcpu, 0);
450                 return 0;
451         }
452 
453         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
454         tpi_data[1] = inti->io.io_int_parm;
455         tpi_data[2] = inti->io.io_int_word;
456         if (addr) {
457                 /*
458                  * Store the two-word I/O interruption code into the
459                  * provided area.
460                  */
461                 len = sizeof(tpi_data) - 4;
462                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
463                 if (rc) {
464                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
465                         goto reinject_interrupt;
466                 }
467         } else {
468                 /*
469                  * Store the three-word I/O interruption code into
470                  * the appropriate lowcore area.
471                  */
472                 len = sizeof(tpi_data);
473                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
474                         /* failed writes to the low core are not recoverable */
475                         rc = -EFAULT;
476                         goto reinject_interrupt;
477                 }
478         }
479 
480         /* irq was successfully handed to the guest */
481         kfree(inti);
482         kvm_s390_set_psw_cc(vcpu, 1);
483         return 0;
484 reinject_interrupt:
485         /*
486          * If we encounter a problem storing the interruption code, the
487          * instruction is suppressed from the guest's view: reinject the
488          * interrupt.
489          */
490         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
491                 kfree(inti);
492                 rc = -EFAULT;
493         }
494         /* don't set the cc, a pgm irq was injected or we drop to user space */
495         return rc ? -EFAULT : 0;
496 }
497 
498 static int handle_tsch(struct kvm_vcpu *vcpu)
499 {
500         struct kvm_s390_interrupt_info *inti = NULL;
501         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
502 
503         vcpu->stat.instruction_tsch++;
504 
505         /* a valid schid has at least one bit set */
506         if (vcpu->run->s.regs.gprs[1])
507                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
508                                            vcpu->run->s.regs.gprs[1]);
509 
510         /*
511          * Prepare exit to userspace.
512          * We indicate whether we dequeued a pending I/O interrupt
513          * so that userspace can re-inject it if the instruction gets
514          * a program check. While this may re-order the pending I/O
515          * interrupts, this is no problem since the priority is kept
516          * intact.
517          */
518         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
519         vcpu->run->s390_tsch.dequeued = !!inti;
520         if (inti) {
521                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
522                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
523                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
524                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
525         }
526         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
527         kfree(inti);
528         return -EREMOTE;
529 }
530 
531 static int handle_io_inst(struct kvm_vcpu *vcpu)
532 {
533         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
534 
535         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
536                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
537 
538         if (vcpu->kvm->arch.css_support) {
539                 /*
540                  * Most I/O instructions will be handled by userspace.
541                  * Exceptions are tpi and the interrupt portion of tsch.
542                  */
543                 if (vcpu->arch.sie_block->ipa == 0xb236)
544                         return handle_tpi(vcpu);
545                 if (vcpu->arch.sie_block->ipa == 0xb235)
546                         return handle_tsch(vcpu);
547                 /* Handle in userspace. */
548                 vcpu->stat.instruction_io_other++;
549                 return -EOPNOTSUPP;
550         } else {
551                 /*
552                  * Set condition code 3 to stop the guest from issuing channel
553                  * I/O instructions.
554                  */
555                 kvm_s390_set_psw_cc(vcpu, 3);
556                 return 0;
557         }
558 }
559 
560 static int handle_stfl(struct kvm_vcpu *vcpu)
561 {
562         int rc;
563         unsigned int fac;
564 
565         vcpu->stat.instruction_stfl++;
566 
567         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
568                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
569 
570         /*
571          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
572          * into a u32 memory representation. They will remain bits 0-31.
573          */
574         fac = *vcpu->kvm->arch.model.fac_list >> 32;
575         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
576                             &fac, sizeof(fac));
577         if (rc)
578                 return rc;
579         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
580         trace_kvm_s390_handle_stfl(vcpu, fac);
581         return 0;
582 }
583 
584 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
585 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
586 #define PSW_ADDR_24 0x0000000000ffffffUL
587 #define PSW_ADDR_31 0x000000007fffffffUL
588 
589 int is_valid_psw(psw_t *psw)
590 {
591         if (psw->mask & PSW_MASK_UNASSIGNED)
592                 return 0;
593         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
594                 if (psw->addr & ~PSW_ADDR_31)
595                         return 0;
596         }
597         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
598                 return 0;
599         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
600                 return 0;
601         if (psw->addr & 1)
602                 return 0;
603         return 1;
604 }
605 
606 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
607 {
608         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
609         psw_compat_t new_psw;
610         u64 addr;
611         int rc;
612         u8 ar;
613 
614         vcpu->stat.instruction_lpsw++;
615 
616         if (gpsw->mask & PSW_MASK_PSTATE)
617                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
618 
619         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
620         if (addr & 7)
621                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
622 
623         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
624         if (rc)
625                 return kvm_s390_inject_prog_cond(vcpu, rc);
626         if (!(new_psw.mask & PSW32_MASK_BASE))
627                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
628         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
629         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
630         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
631         if (!is_valid_psw(gpsw))
632                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
633         return 0;
634 }
635 
636 static int handle_lpswe(struct kvm_vcpu *vcpu)
637 {
638         psw_t new_psw;
639         u64 addr;
640         int rc;
641         u8 ar;
642 
643         vcpu->stat.instruction_lpswe++;
644 
645         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
646                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
647 
648         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
649         if (addr & 7)
650                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
651         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
652         if (rc)
653                 return kvm_s390_inject_prog_cond(vcpu, rc);
654         vcpu->arch.sie_block->gpsw = new_psw;
655         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
656                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
657         return 0;
658 }
659 
660 static int handle_stidp(struct kvm_vcpu *vcpu)
661 {
662         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
663         u64 operand2;
664         int rc;
665         u8 ar;
666 
667         vcpu->stat.instruction_stidp++;
668 
669         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
670                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
671 
672         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
673 
674         if (operand2 & 7)
675                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
676 
677         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
678         if (rc)
679                 return kvm_s390_inject_prog_cond(vcpu, rc);
680 
681         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
682         return 0;
683 }
684 
685 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
686 {
687         int cpus = 0;
688         int n;
689 
690         cpus = atomic_read(&vcpu->kvm->online_vcpus);
691 
692         /* deal with other level 3 hypervisors */
693         if (stsi(mem, 3, 2, 2))
694                 mem->count = 0;
695         if (mem->count < 8)
696                 mem->count++;
697         for (n = mem->count - 1; n > 0 ; n--)
698                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
699 
700         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
701         mem->vm[0].cpus_total = cpus;
702         mem->vm[0].cpus_configured = cpus;
703         mem->vm[0].cpus_standby = 0;
704         mem->vm[0].cpus_reserved = 0;
705         mem->vm[0].caf = 1000;
706         memcpy(mem->vm[0].name, "KVMguest", 8);
707         ASCEBC(mem->vm[0].name, 8);
708         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
709         ASCEBC(mem->vm[0].cpi, 16);
710 }
711 
712 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, u8 ar,
713                                  u8 fc, u8 sel1, u16 sel2)
714 {
715         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
716         vcpu->run->s390_stsi.addr = addr;
717         vcpu->run->s390_stsi.ar = ar;
718         vcpu->run->s390_stsi.fc = fc;
719         vcpu->run->s390_stsi.sel1 = sel1;
720         vcpu->run->s390_stsi.sel2 = sel2;
721 }
722 
723 static int handle_stsi(struct kvm_vcpu *vcpu)
724 {
725         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
726         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
727         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
728         unsigned long mem = 0;
729         u64 operand2;
730         int rc = 0;
731         u8 ar;
732 
733         vcpu->stat.instruction_stsi++;
734         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
735 
736         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
737                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
738 
739         if (fc > 3) {
740                 kvm_s390_set_psw_cc(vcpu, 3);
741                 return 0;
742         }
743 
744         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
745             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
746                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
747 
748         if (fc == 0) {
749                 vcpu->run->s.regs.gprs[0] = 3 << 28;
750                 kvm_s390_set_psw_cc(vcpu, 0);
751                 return 0;
752         }
753 
754         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
755 
756         if (operand2 & 0xfff)
757                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
758 
759         switch (fc) {
760         case 1: /* same handling for 1 and 2 */
761         case 2:
762                 mem = get_zeroed_page(GFP_KERNEL);
763                 if (!mem)
764                         goto out_no_data;
765                 if (stsi((void *) mem, fc, sel1, sel2))
766                         goto out_no_data;
767                 break;
768         case 3:
769                 if (sel1 != 2 || sel2 != 2)
770                         goto out_no_data;
771                 mem = get_zeroed_page(GFP_KERNEL);
772                 if (!mem)
773                         goto out_no_data;
774                 handle_stsi_3_2_2(vcpu, (void *) mem);
775                 break;
776         }
777 
778         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
779         if (rc) {
780                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
781                 goto out;
782         }
783         if (vcpu->kvm->arch.user_stsi) {
784                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
785                 rc = -EREMOTE;
786         }
787         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
788         free_page(mem);
789         kvm_s390_set_psw_cc(vcpu, 0);
790         vcpu->run->s.regs.gprs[0] = 0;
791         return rc;
792 out_no_data:
793         kvm_s390_set_psw_cc(vcpu, 3);
794 out:
795         free_page(mem);
796         return rc;
797 }
798 
799 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
800 {
801         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
802         case 0x02:
803                 return handle_stidp(vcpu);
804         case 0x04:
805                 return handle_set_clock(vcpu);
806         case 0x10:
807                 return handle_set_prefix(vcpu);
808         case 0x11:
809                 return handle_store_prefix(vcpu);
810         case 0x12:
811                 return handle_store_cpu_address(vcpu);
812         case 0x14:
813                 return kvm_s390_handle_vsie(vcpu);
814         case 0x21:
815         case 0x50:
816                 return handle_ipte_interlock(vcpu);
817         case 0x29:
818                 return handle_iske(vcpu);
819         case 0x2a:
820                 return handle_rrbe(vcpu);
821         case 0x2b:
822                 return handle_sske(vcpu);
823         case 0x2c:
824                 return handle_test_block(vcpu);
825         case 0x30:
826         case 0x31:
827         case 0x32:
828         case 0x33:
829         case 0x34:
830         case 0x35:
831         case 0x36:
832         case 0x37:
833         case 0x38:
834         case 0x39:
835         case 0x3a:
836         case 0x3b:
837         case 0x3c:
838         case 0x5f:
839         case 0x74:
840         case 0x76:
841                 return handle_io_inst(vcpu);
842         case 0x56:
843                 return handle_sthyi(vcpu);
844         case 0x7d:
845                 return handle_stsi(vcpu);
846         case 0xb1:
847                 return handle_stfl(vcpu);
848         case 0xb2:
849                 return handle_lpswe(vcpu);
850         default:
851                 return -EOPNOTSUPP;
852         }
853 }
854 
855 static int handle_epsw(struct kvm_vcpu *vcpu)
856 {
857         int reg1, reg2;
858 
859         vcpu->stat.instruction_epsw++;
860 
861         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
862 
863         /* This basically extracts the mask half of the psw. */
864         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
865         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
866         if (reg2) {
867                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
868                 vcpu->run->s.regs.gprs[reg2] |=
869                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
870         }
871         return 0;
872 }
873 
874 #define PFMF_RESERVED   0xfffc0101UL
875 #define PFMF_SK         0x00020000UL
876 #define PFMF_CF         0x00010000UL
877 #define PFMF_UI         0x00008000UL
878 #define PFMF_FSC        0x00007000UL
879 #define PFMF_NQ         0x00000800UL
880 #define PFMF_MR         0x00000400UL
881 #define PFMF_MC         0x00000200UL
882 #define PFMF_KEY        0x000000feUL
883 
884 static int handle_pfmf(struct kvm_vcpu *vcpu)
885 {
886         bool mr = false, mc = false, nq;
887         int reg1, reg2;
888         unsigned long start, end;
889         unsigned char key;
890 
891         vcpu->stat.instruction_pfmf++;
892 
893         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
894 
895         if (!test_kvm_facility(vcpu->kvm, 8))
896                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
897 
898         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
899                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
900 
901         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
902                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
903 
904         /* Only provide non-quiescing support if enabled for the guest */
905         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
906             !test_kvm_facility(vcpu->kvm, 14))
907                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
908 
909         /* Only provide conditional-SSKE support if enabled for the guest */
910         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
911             test_kvm_facility(vcpu->kvm, 10)) {
912                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
913                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
914         }
915 
916         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
917         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
918         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
919         start = kvm_s390_logical_to_effective(vcpu, start);
920 
921         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
922                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
923                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
924         }
925 
926         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
927         case 0x00000000:
928                 /* only 4k frames specify a real address */
929                 start = kvm_s390_real_to_abs(vcpu, start);
930                 end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
931                 break;
932         case 0x00001000:
933                 end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
934                 break;
935         case 0x00002000:
936                 /* only support 2G frame size if EDAT2 is available and we are
937                    not in 24-bit addressing mode */
938                 if (!test_kvm_facility(vcpu->kvm, 78) ||
939                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
940                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
941                 end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
942                 break;
943         default:
944                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
945         }
946 
947         while (start != end) {
948                 unsigned long useraddr;
949 
950                 /* Translate guest address to host address */
951                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
952                 if (kvm_is_error_hva(useraddr))
953                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
954 
955                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
956                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
957                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
958                 }
959 
960                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
961                         int rc = kvm_s390_skey_check_enable(vcpu);
962 
963                         if (rc)
964                                 return rc;
965                         down_read(&current->mm->mmap_sem);
966                         rc = cond_set_guest_storage_key(current->mm, useraddr,
967                                                         key, NULL, nq, mr, mc);
968                         up_read(&current->mm->mmap_sem);
969                         if (rc < 0)
970                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
971                 }
972 
973                 start += PAGE_SIZE;
974         }
975         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
976                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
977                         vcpu->run->s.regs.gprs[reg2] = end;
978                 } else {
979                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
980                         end = kvm_s390_logical_to_effective(vcpu, end);
981                         vcpu->run->s.regs.gprs[reg2] |= end;
982                 }
983         }
984         return 0;
985 }
986 
987 static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
988 {
989         struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state;
990         int r1, r2, nappended, entries;
991         unsigned long gfn, hva, res, pgstev, ptev;
992         unsigned long *cbrlo;
993 
994         /*
995          * We don't need to set SD.FPF.SK to 1 here, because if we have a
996          * machine check here we either handle it or crash
997          */
998 
999         kvm_s390_get_regs_rre(vcpu, &r1, &r2);
1000         gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
1001         hva = gfn_to_hva(vcpu->kvm, gfn);
1002         entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1003 
1004         if (kvm_is_error_hva(hva))
1005                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1006 
1007         nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
1008         if (nappended < 0) {
1009                 res = orc ? 0x10 : 0;
1010                 vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
1011                 return 0;
1012         }
1013         res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
1014         /*
1015          * Set the block-content state part of the result. 0 means resident, so
1016          * nothing to do if the page is valid. 2 is for preserved pages
1017          * (non-present and non-zero), and 3 for zero pages (non-present and
1018          * zero).
1019          */
1020         if (ptev & _PAGE_INVALID) {
1021                 res |= 2;
1022                 if (pgstev & _PGSTE_GPS_ZERO)
1023                         res |= 1;
1024         }
1025         if (pgstev & _PGSTE_GPS_NODAT)
1026                 res |= 0x20;
1027         vcpu->run->s.regs.gprs[r1] = res;
1028         /*
1029          * It is possible that all the normal 511 slots were full, in which case
1030          * we will now write in the 512th slot, which is reserved for host use.
1031          * In both cases we let the normal essa handling code process all the
1032          * slots, including the reserved one, if needed.
1033          */
1034         if (nappended > 0) {
1035                 cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
1036                 cbrlo[entries] = gfn << PAGE_SHIFT;
1037         }
1038 
1039         if (orc && gfn < ms->bitmap_size) {
1040                 /* increment only if we are really flipping the bit to 1 */
1041                 if (!test_and_set_bit(gfn, ms->pgste_bitmap))
1042                         atomic64_inc(&ms->dirty_pages);
1043         }
1044 
1045         return nappended;
1046 }
1047 
1048 static int handle_essa(struct kvm_vcpu *vcpu)
1049 {
1050         /* entries expected to be 1FF */
1051         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
1052         unsigned long *cbrlo;
1053         struct gmap *gmap;
1054         int i, orc;
1055 
1056         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
1057         gmap = vcpu->arch.gmap;
1058         vcpu->stat.instruction_essa++;
1059         if (!vcpu->kvm->arch.use_cmma)
1060                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
1061 
1062         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1063                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1064         /* Check for invalid operation request code */
1065         orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
1066         /* ORCs 0-6 are always valid */
1067         if (orc > (test_kvm_facility(vcpu->kvm, 147) ? ESSA_SET_STABLE_NODAT
1068                                                 : ESSA_SET_STABLE_IF_RESIDENT))
1069                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1070 
1071         if (likely(!vcpu->kvm->arch.migration_state)) {
1072                 /*
1073                  * CMMA is enabled in the KVM settings, but is disabled in
1074                  * the SIE block and in the mm_context, and we are not doing
1075                  * a migration. Enable CMMA in the mm_context.
1076                  * Since we need to take a write lock to write to the context
1077                  * to avoid races with storage keys handling, we check if the
1078                  * value really needs to be written to; if the value is
1079                  * already correct, we do nothing and avoid the lock.
1080                  */
1081                 if (vcpu->kvm->mm->context.use_cmma == 0) {
1082                         down_write(&vcpu->kvm->mm->mmap_sem);
1083                         vcpu->kvm->mm->context.use_cmma = 1;
1084                         up_write(&vcpu->kvm->mm->mmap_sem);
1085                 }
1086                 /*
1087                  * If we are here, we are supposed to have CMMA enabled in
1088                  * the SIE block. Enabling CMMA works on a per-CPU basis,
1089                  * while the context use_cmma flag is per process.
1090                  * It's possible that the context flag is enabled and the
1091                  * SIE flag is not, so we set the flag always; if it was
1092                  * already set, nothing changes, otherwise we enable it
1093                  * on this CPU too.
1094                  */
1095                 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
1096                 /* Retry the ESSA instruction */
1097                 kvm_s390_retry_instr(vcpu);
1098         } else {
1099                 /* Account for the possible extra cbrl entry */
1100                 i = do_essa(vcpu, orc);
1101                 if (i < 0)
1102                         return i;
1103                 entries += i;
1104         }
1105         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
1106         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
1107         down_read(&gmap->mm->mmap_sem);
1108         for (i = 0; i < entries; ++i)
1109                 __gmap_zap(gmap, cbrlo[i]);
1110         up_read(&gmap->mm->mmap_sem);
1111         return 0;
1112 }
1113 
1114 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
1115 {
1116         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1117         case 0x8a:
1118         case 0x8e:
1119         case 0x8f:
1120                 return handle_ipte_interlock(vcpu);
1121         case 0x8d:
1122                 return handle_epsw(vcpu);
1123         case 0xab:
1124                 return handle_essa(vcpu);
1125         case 0xaf:
1126                 return handle_pfmf(vcpu);
1127         default:
1128                 return -EOPNOTSUPP;
1129         }
1130 }
1131 
1132 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
1133 {
1134         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1135         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1136         int reg, rc, nr_regs;
1137         u32 ctl_array[16];
1138         u64 ga;
1139         u8 ar;
1140 
1141         vcpu->stat.instruction_lctl++;
1142 
1143         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1144                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1145 
1146         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1147 
1148         if (ga & 3)
1149                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1150 
1151         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1152         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
1153 
1154         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1155         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1156         if (rc)
1157                 return kvm_s390_inject_prog_cond(vcpu, rc);
1158         reg = reg1;
1159         nr_regs = 0;
1160         do {
1161                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
1162                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
1163                 if (reg == reg3)
1164                         break;
1165                 reg = (reg + 1) % 16;
1166         } while (1);
1167         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1168         return 0;
1169 }
1170 
1171 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1172 {
1173         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1174         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1175         int reg, rc, nr_regs;
1176         u32 ctl_array[16];
1177         u64 ga;
1178         u8 ar;
1179 
1180         vcpu->stat.instruction_stctl++;
1181 
1182         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1183                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1184 
1185         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1186 
1187         if (ga & 3)
1188                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1189 
1190         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1191         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1192 
1193         reg = reg1;
1194         nr_regs = 0;
1195         do {
1196                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1197                 if (reg == reg3)
1198                         break;
1199                 reg = (reg + 1) % 16;
1200         } while (1);
1201         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1202         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1203 }
1204 
1205 static int handle_lctlg(struct kvm_vcpu *vcpu)
1206 {
1207         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1208         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1209         int reg, rc, nr_regs;
1210         u64 ctl_array[16];
1211         u64 ga;
1212         u8 ar;
1213 
1214         vcpu->stat.instruction_lctlg++;
1215 
1216         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1217                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1218 
1219         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1220 
1221         if (ga & 7)
1222                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1223 
1224         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1225         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1226 
1227         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1228         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1229         if (rc)
1230                 return kvm_s390_inject_prog_cond(vcpu, rc);
1231         reg = reg1;
1232         nr_regs = 0;
1233         do {
1234                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1235                 if (reg == reg3)
1236                         break;
1237                 reg = (reg + 1) % 16;
1238         } while (1);
1239         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1240         return 0;
1241 }
1242 
1243 static int handle_stctg(struct kvm_vcpu *vcpu)
1244 {
1245         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1246         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1247         int reg, rc, nr_regs;
1248         u64 ctl_array[16];
1249         u64 ga;
1250         u8 ar;
1251 
1252         vcpu->stat.instruction_stctg++;
1253 
1254         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1255                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1256 
1257         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1258 
1259         if (ga & 7)
1260                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1261 
1262         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1263         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1264 
1265         reg = reg1;
1266         nr_regs = 0;
1267         do {
1268                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1269                 if (reg == reg3)
1270                         break;
1271                 reg = (reg + 1) % 16;
1272         } while (1);
1273         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1274         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1275 }
1276 
1277 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1278 {
1279         switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
1280         case 0x25:
1281                 return handle_stctg(vcpu);
1282         case 0x2f:
1283                 return handle_lctlg(vcpu);
1284         case 0x60:
1285         case 0x61:
1286         case 0x62:
1287                 return handle_ri(vcpu);
1288         default:
1289                 return -EOPNOTSUPP;
1290         }
1291 }
1292 
1293 static int handle_tprot(struct kvm_vcpu *vcpu)
1294 {
1295         u64 address1, address2;
1296         unsigned long hva, gpa;
1297         int ret = 0, cc = 0;
1298         bool writable;
1299         u8 ar;
1300 
1301         vcpu->stat.instruction_tprot++;
1302 
1303         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1304                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1305 
1306         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1307 
1308         /* we only handle the Linux memory detection case:
1309          * access key == 0
1310          * everything else goes to userspace. */
1311         if (address2 & 0xf0)
1312                 return -EOPNOTSUPP;
1313         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1314                 ipte_lock(vcpu);
1315         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1316         if (ret == PGM_PROTECTION) {
1317                 /* Write protected? Try again with read-only... */
1318                 cc = 1;
1319                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1320                                               GACC_FETCH);
1321         }
1322         if (ret) {
1323                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1324                         ret = kvm_s390_inject_program_int(vcpu, ret);
1325                 } else if (ret > 0) {
1326                         /* Translation not available */
1327                         kvm_s390_set_psw_cc(vcpu, 3);
1328                         ret = 0;
1329                 }
1330                 goto out_unlock;
1331         }
1332 
1333         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1334         if (kvm_is_error_hva(hva)) {
1335                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1336         } else {
1337                 if (!writable)
1338                         cc = 1;         /* Write not permitted ==> read-only */
1339                 kvm_s390_set_psw_cc(vcpu, cc);
1340                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1341         }
1342 out_unlock:
1343         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1344                 ipte_unlock(vcpu);
1345         return ret;
1346 }
1347 
1348 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1349 {
1350         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1351         case 0x01:
1352                 return handle_tprot(vcpu);
1353         default:
1354                 return -EOPNOTSUPP;
1355         }
1356 }
1357 
1358 static int handle_sckpf(struct kvm_vcpu *vcpu)
1359 {
1360         u32 value;
1361 
1362         vcpu->stat.instruction_sckpf++;
1363 
1364         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1365                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1366 
1367         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1368                 return kvm_s390_inject_program_int(vcpu,
1369                                                    PGM_SPECIFICATION);
1370 
1371         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1372         vcpu->arch.sie_block->todpr = value;
1373 
1374         return 0;
1375 }
1376 
1377 static int handle_ptff(struct kvm_vcpu *vcpu)
1378 {
1379         vcpu->stat.instruction_ptff++;
1380 
1381         /* we don't emulate any control instructions yet */
1382         kvm_s390_set_psw_cc(vcpu, 3);
1383         return 0;
1384 }
1385 
1386 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1387 {
1388         switch (vcpu->arch.sie_block->ipa & 0x00ff) {
1389         case 0x04:
1390                 return handle_ptff(vcpu);
1391         case 0x07:
1392                 return handle_sckpf(vcpu);
1393         default:
1394                 return -EOPNOTSUPP;
1395         }
1396 }
1397 

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