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

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  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/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 /* Handle SCK (SET CLOCK) interception */
 36 static int handle_set_clock(struct kvm_vcpu *vcpu)
 37 {
 38         int rc;
 39         ar_t ar;
 40         u64 op2, val;
 41 
 42         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 43                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 44 
 45         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 46         if (op2 & 7)    /* Operand must be on a doubleword boundary */
 47                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 48         rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
 49         if (rc)
 50                 return kvm_s390_inject_prog_cond(vcpu, rc);
 51 
 52         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
 53         kvm_s390_set_tod_clock(vcpu->kvm, val);
 54 
 55         kvm_s390_set_psw_cc(vcpu, 0);
 56         return 0;
 57 }
 58 
 59 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 60 {
 61         u64 operand2;
 62         u32 address;
 63         int rc;
 64         ar_t ar;
 65 
 66         vcpu->stat.instruction_spx++;
 67 
 68         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 69                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 70 
 71         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 72 
 73         /* must be word boundary */
 74         if (operand2 & 3)
 75                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 76 
 77         /* get the value */
 78         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 79         if (rc)
 80                 return kvm_s390_inject_prog_cond(vcpu, rc);
 81 
 82         address &= 0x7fffe000u;
 83 
 84         /*
 85          * Make sure the new value is valid memory. We only need to check the
 86          * first page, since address is 8k aligned and memory pieces are always
 87          * at least 1MB aligned and have at least a size of 1MB.
 88          */
 89         if (kvm_is_error_gpa(vcpu->kvm, address))
 90                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 91 
 92         kvm_s390_set_prefix(vcpu, address);
 93         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 94         return 0;
 95 }
 96 
 97 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 98 {
 99         u64 operand2;
100         u32 address;
101         int rc;
102         ar_t ar;
103 
104         vcpu->stat.instruction_stpx++;
105 
106         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
107                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
108 
109         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
110 
111         /* must be word boundary */
112         if (operand2 & 3)
113                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
114 
115         address = kvm_s390_get_prefix(vcpu);
116 
117         /* get the value */
118         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
119         if (rc)
120                 return kvm_s390_inject_prog_cond(vcpu, rc);
121 
122         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
123         trace_kvm_s390_handle_prefix(vcpu, 0, address);
124         return 0;
125 }
126 
127 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
128 {
129         u16 vcpu_id = vcpu->vcpu_id;
130         u64 ga;
131         int rc;
132         ar_t ar;
133 
134         vcpu->stat.instruction_stap++;
135 
136         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
137                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
138 
139         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
140 
141         if (ga & 1)
142                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
143 
144         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
145         if (rc)
146                 return kvm_s390_inject_prog_cond(vcpu, rc);
147 
148         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
149         trace_kvm_s390_handle_stap(vcpu, ga);
150         return 0;
151 }
152 
153 static int __skey_check_enable(struct kvm_vcpu *vcpu)
154 {
155         int rc = 0;
156 
157         trace_kvm_s390_skey_related_inst(vcpu);
158         if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
159                 return rc;
160 
161         rc = s390_enable_skey();
162         VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
163         if (!rc)
164                 vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
165         return rc;
166 }
167 
168 static int try_handle_skey(struct kvm_vcpu *vcpu)
169 {
170         int rc;
171 
172         vcpu->stat.instruction_storage_key++;
173         rc = __skey_check_enable(vcpu);
174         if (rc)
175                 return rc;
176         if (sclp.has_skey) {
177                 /* with storage-key facility, SIE interprets it for us */
178                 kvm_s390_retry_instr(vcpu);
179                 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
180                 return -EAGAIN;
181         }
182         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
183                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
184         return 0;
185 }
186 
187 static int handle_iske(struct kvm_vcpu *vcpu)
188 {
189         unsigned long addr;
190         unsigned char key;
191         int reg1, reg2;
192         int rc;
193 
194         rc = try_handle_skey(vcpu);
195         if (rc)
196                 return rc != -EAGAIN ? rc : 0;
197 
198         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
199 
200         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
201         addr = kvm_s390_logical_to_effective(vcpu, addr);
202         addr = kvm_s390_real_to_abs(vcpu, addr);
203         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
204         if (kvm_is_error_hva(addr))
205                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
206 
207         down_read(&current->mm->mmap_sem);
208         rc = get_guest_storage_key(current->mm, addr, &key);
209         up_read(&current->mm->mmap_sem);
210         if (rc)
211                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
212         vcpu->run->s.regs.gprs[reg1] &= ~0xff;
213         vcpu->run->s.regs.gprs[reg1] |= key;
214         return 0;
215 }
216 
217 static int handle_rrbe(struct kvm_vcpu *vcpu)
218 {
219         unsigned long addr;
220         int reg1, reg2;
221         int rc;
222 
223         rc = try_handle_skey(vcpu);
224         if (rc)
225                 return rc != -EAGAIN ? rc : 0;
226 
227         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
228 
229         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
230         addr = kvm_s390_logical_to_effective(vcpu, addr);
231         addr = kvm_s390_real_to_abs(vcpu, addr);
232         addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
233         if (kvm_is_error_hva(addr))
234                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
235 
236         down_read(&current->mm->mmap_sem);
237         rc = reset_guest_reference_bit(current->mm, addr);
238         up_read(&current->mm->mmap_sem);
239         if (rc < 0)
240                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
241 
242         kvm_s390_set_psw_cc(vcpu, rc);
243         return 0;
244 }
245 
246 #define SSKE_NQ 0x8
247 #define SSKE_MR 0x4
248 #define SSKE_MC 0x2
249 #define SSKE_MB 0x1
250 static int handle_sske(struct kvm_vcpu *vcpu)
251 {
252         unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
253         unsigned long start, end;
254         unsigned char key, oldkey;
255         int reg1, reg2;
256         int rc;
257 
258         rc = try_handle_skey(vcpu);
259         if (rc)
260                 return rc != -EAGAIN ? rc : 0;
261 
262         if (!test_kvm_facility(vcpu->kvm, 8))
263                 m3 &= ~SSKE_MB;
264         if (!test_kvm_facility(vcpu->kvm, 10))
265                 m3 &= ~(SSKE_MC | SSKE_MR);
266         if (!test_kvm_facility(vcpu->kvm, 14))
267                 m3 &= ~SSKE_NQ;
268 
269         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
270 
271         key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
272         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
273         start = kvm_s390_logical_to_effective(vcpu, start);
274         if (m3 & SSKE_MB) {
275                 /* start already designates an absolute address */
276                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
277         } else {
278                 start = kvm_s390_real_to_abs(vcpu, start);
279                 end = start + PAGE_SIZE;
280         }
281 
282         while (start != end) {
283                 unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
284 
285                 if (kvm_is_error_hva(addr))
286                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
287 
288                 down_read(&current->mm->mmap_sem);
289                 rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
290                                                 m3 & SSKE_NQ, m3 & SSKE_MR,
291                                                 m3 & SSKE_MC);
292                 up_read(&current->mm->mmap_sem);
293                 if (rc < 0)
294                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
295                 start += PAGE_SIZE;
296         };
297 
298         if (m3 & (SSKE_MC | SSKE_MR)) {
299                 if (m3 & SSKE_MB) {
300                         /* skey in reg1 is unpredictable */
301                         kvm_s390_set_psw_cc(vcpu, 3);
302                 } else {
303                         kvm_s390_set_psw_cc(vcpu, rc);
304                         vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
305                         vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
306                 }
307         }
308         if (m3 & SSKE_MB) {
309                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT)
310                         vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
311                 else
312                         vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
313                 end = kvm_s390_logical_to_effective(vcpu, end);
314                 vcpu->run->s.regs.gprs[reg2] |= end;
315         }
316         return 0;
317 }
318 
319 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
320 {
321         vcpu->stat.instruction_ipte_interlock++;
322         if (psw_bits(vcpu->arch.sie_block->gpsw).p)
323                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
324         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
325         kvm_s390_retry_instr(vcpu);
326         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
327         return 0;
328 }
329 
330 static int handle_test_block(struct kvm_vcpu *vcpu)
331 {
332         gpa_t addr;
333         int reg2;
334 
335         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
336                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
337 
338         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
339         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
340         addr = kvm_s390_logical_to_effective(vcpu, addr);
341         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
342                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
343         addr = kvm_s390_real_to_abs(vcpu, addr);
344 
345         if (kvm_is_error_gpa(vcpu->kvm, addr))
346                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
347         /*
348          * We don't expect errors on modern systems, and do not care
349          * about storage keys (yet), so let's just clear the page.
350          */
351         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
352                 return -EFAULT;
353         kvm_s390_set_psw_cc(vcpu, 0);
354         vcpu->run->s.regs.gprs[0] = 0;
355         return 0;
356 }
357 
358 static int handle_tpi(struct kvm_vcpu *vcpu)
359 {
360         struct kvm_s390_interrupt_info *inti;
361         unsigned long len;
362         u32 tpi_data[3];
363         int rc;
364         u64 addr;
365         ar_t ar;
366 
367         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
368         if (addr & 3)
369                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
370 
371         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
372         if (!inti) {
373                 kvm_s390_set_psw_cc(vcpu, 0);
374                 return 0;
375         }
376 
377         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
378         tpi_data[1] = inti->io.io_int_parm;
379         tpi_data[2] = inti->io.io_int_word;
380         if (addr) {
381                 /*
382                  * Store the two-word I/O interruption code into the
383                  * provided area.
384                  */
385                 len = sizeof(tpi_data) - 4;
386                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
387                 if (rc) {
388                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
389                         goto reinject_interrupt;
390                 }
391         } else {
392                 /*
393                  * Store the three-word I/O interruption code into
394                  * the appropriate lowcore area.
395                  */
396                 len = sizeof(tpi_data);
397                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
398                         /* failed writes to the low core are not recoverable */
399                         rc = -EFAULT;
400                         goto reinject_interrupt;
401                 }
402         }
403 
404         /* irq was successfully handed to the guest */
405         kfree(inti);
406         kvm_s390_set_psw_cc(vcpu, 1);
407         return 0;
408 reinject_interrupt:
409         /*
410          * If we encounter a problem storing the interruption code, the
411          * instruction is suppressed from the guest's view: reinject the
412          * interrupt.
413          */
414         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
415                 kfree(inti);
416                 rc = -EFAULT;
417         }
418         /* don't set the cc, a pgm irq was injected or we drop to user space */
419         return rc ? -EFAULT : 0;
420 }
421 
422 static int handle_tsch(struct kvm_vcpu *vcpu)
423 {
424         struct kvm_s390_interrupt_info *inti = NULL;
425         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
426 
427         /* a valid schid has at least one bit set */
428         if (vcpu->run->s.regs.gprs[1])
429                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
430                                            vcpu->run->s.regs.gprs[1]);
431 
432         /*
433          * Prepare exit to userspace.
434          * We indicate whether we dequeued a pending I/O interrupt
435          * so that userspace can re-inject it if the instruction gets
436          * a program check. While this may re-order the pending I/O
437          * interrupts, this is no problem since the priority is kept
438          * intact.
439          */
440         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
441         vcpu->run->s390_tsch.dequeued = !!inti;
442         if (inti) {
443                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
444                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
445                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
446                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
447         }
448         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
449         kfree(inti);
450         return -EREMOTE;
451 }
452 
453 static int handle_io_inst(struct kvm_vcpu *vcpu)
454 {
455         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
456 
457         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
458                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
459 
460         if (vcpu->kvm->arch.css_support) {
461                 /*
462                  * Most I/O instructions will be handled by userspace.
463                  * Exceptions are tpi and the interrupt portion of tsch.
464                  */
465                 if (vcpu->arch.sie_block->ipa == 0xb236)
466                         return handle_tpi(vcpu);
467                 if (vcpu->arch.sie_block->ipa == 0xb235)
468                         return handle_tsch(vcpu);
469                 /* Handle in userspace. */
470                 return -EOPNOTSUPP;
471         } else {
472                 /*
473                  * Set condition code 3 to stop the guest from issuing channel
474                  * I/O instructions.
475                  */
476                 kvm_s390_set_psw_cc(vcpu, 3);
477                 return 0;
478         }
479 }
480 
481 static int handle_stfl(struct kvm_vcpu *vcpu)
482 {
483         int rc;
484         unsigned int fac;
485 
486         vcpu->stat.instruction_stfl++;
487 
488         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
489                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
490 
491         /*
492          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
493          * into a u32 memory representation. They will remain bits 0-31.
494          */
495         fac = *vcpu->kvm->arch.model.fac_list >> 32;
496         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
497                             &fac, sizeof(fac));
498         if (rc)
499                 return rc;
500         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
501         trace_kvm_s390_handle_stfl(vcpu, fac);
502         return 0;
503 }
504 
505 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
506 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
507 #define PSW_ADDR_24 0x0000000000ffffffUL
508 #define PSW_ADDR_31 0x000000007fffffffUL
509 
510 int is_valid_psw(psw_t *psw)
511 {
512         if (psw->mask & PSW_MASK_UNASSIGNED)
513                 return 0;
514         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
515                 if (psw->addr & ~PSW_ADDR_31)
516                         return 0;
517         }
518         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
519                 return 0;
520         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
521                 return 0;
522         if (psw->addr & 1)
523                 return 0;
524         return 1;
525 }
526 
527 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
528 {
529         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
530         psw_compat_t new_psw;
531         u64 addr;
532         int rc;
533         ar_t ar;
534 
535         if (gpsw->mask & PSW_MASK_PSTATE)
536                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
537 
538         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
539         if (addr & 7)
540                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
541 
542         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
543         if (rc)
544                 return kvm_s390_inject_prog_cond(vcpu, rc);
545         if (!(new_psw.mask & PSW32_MASK_BASE))
546                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
547         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
548         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
549         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
550         if (!is_valid_psw(gpsw))
551                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
552         return 0;
553 }
554 
555 static int handle_lpswe(struct kvm_vcpu *vcpu)
556 {
557         psw_t new_psw;
558         u64 addr;
559         int rc;
560         ar_t ar;
561 
562         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
563                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
564 
565         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
566         if (addr & 7)
567                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
568         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
569         if (rc)
570                 return kvm_s390_inject_prog_cond(vcpu, rc);
571         vcpu->arch.sie_block->gpsw = new_psw;
572         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
573                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
574         return 0;
575 }
576 
577 static int handle_stidp(struct kvm_vcpu *vcpu)
578 {
579         u64 stidp_data = vcpu->kvm->arch.model.cpuid;
580         u64 operand2;
581         int rc;
582         ar_t ar;
583 
584         vcpu->stat.instruction_stidp++;
585 
586         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
587                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
588 
589         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
590 
591         if (operand2 & 7)
592                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
593 
594         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
595         if (rc)
596                 return kvm_s390_inject_prog_cond(vcpu, rc);
597 
598         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
599         return 0;
600 }
601 
602 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
603 {
604         int cpus = 0;
605         int n;
606 
607         cpus = atomic_read(&vcpu->kvm->online_vcpus);
608 
609         /* deal with other level 3 hypervisors */
610         if (stsi(mem, 3, 2, 2))
611                 mem->count = 0;
612         if (mem->count < 8)
613                 mem->count++;
614         for (n = mem->count - 1; n > 0 ; n--)
615                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
616 
617         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
618         mem->vm[0].cpus_total = cpus;
619         mem->vm[0].cpus_configured = cpus;
620         mem->vm[0].cpus_standby = 0;
621         mem->vm[0].cpus_reserved = 0;
622         mem->vm[0].caf = 1000;
623         memcpy(mem->vm[0].name, "KVMguest", 8);
624         ASCEBC(mem->vm[0].name, 8);
625         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
626         ASCEBC(mem->vm[0].cpi, 16);
627 }
628 
629 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
630                                  u8 fc, u8 sel1, u16 sel2)
631 {
632         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
633         vcpu->run->s390_stsi.addr = addr;
634         vcpu->run->s390_stsi.ar = ar;
635         vcpu->run->s390_stsi.fc = fc;
636         vcpu->run->s390_stsi.sel1 = sel1;
637         vcpu->run->s390_stsi.sel2 = sel2;
638 }
639 
640 static int handle_stsi(struct kvm_vcpu *vcpu)
641 {
642         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
643         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
644         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
645         unsigned long mem = 0;
646         u64 operand2;
647         int rc = 0;
648         ar_t ar;
649 
650         vcpu->stat.instruction_stsi++;
651         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
652 
653         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
654                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
655 
656         if (fc > 3) {
657                 kvm_s390_set_psw_cc(vcpu, 3);
658                 return 0;
659         }
660 
661         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
662             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
663                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
664 
665         if (fc == 0) {
666                 vcpu->run->s.regs.gprs[0] = 3 << 28;
667                 kvm_s390_set_psw_cc(vcpu, 0);
668                 return 0;
669         }
670 
671         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
672 
673         if (operand2 & 0xfff)
674                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
675 
676         switch (fc) {
677         case 1: /* same handling for 1 and 2 */
678         case 2:
679                 mem = get_zeroed_page(GFP_KERNEL);
680                 if (!mem)
681                         goto out_no_data;
682                 if (stsi((void *) mem, fc, sel1, sel2))
683                         goto out_no_data;
684                 break;
685         case 3:
686                 if (sel1 != 2 || sel2 != 2)
687                         goto out_no_data;
688                 mem = get_zeroed_page(GFP_KERNEL);
689                 if (!mem)
690                         goto out_no_data;
691                 handle_stsi_3_2_2(vcpu, (void *) mem);
692                 break;
693         }
694 
695         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
696         if (rc) {
697                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
698                 goto out;
699         }
700         if (vcpu->kvm->arch.user_stsi) {
701                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
702                 rc = -EREMOTE;
703         }
704         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
705         free_page(mem);
706         kvm_s390_set_psw_cc(vcpu, 0);
707         vcpu->run->s.regs.gprs[0] = 0;
708         return rc;
709 out_no_data:
710         kvm_s390_set_psw_cc(vcpu, 3);
711 out:
712         free_page(mem);
713         return rc;
714 }
715 
716 static const intercept_handler_t b2_handlers[256] = {
717         [0x02] = handle_stidp,
718         [0x04] = handle_set_clock,
719         [0x10] = handle_set_prefix,
720         [0x11] = handle_store_prefix,
721         [0x12] = handle_store_cpu_address,
722         [0x14] = kvm_s390_handle_vsie,
723         [0x21] = handle_ipte_interlock,
724         [0x29] = handle_iske,
725         [0x2a] = handle_rrbe,
726         [0x2b] = handle_sske,
727         [0x2c] = handle_test_block,
728         [0x30] = handle_io_inst,
729         [0x31] = handle_io_inst,
730         [0x32] = handle_io_inst,
731         [0x33] = handle_io_inst,
732         [0x34] = handle_io_inst,
733         [0x35] = handle_io_inst,
734         [0x36] = handle_io_inst,
735         [0x37] = handle_io_inst,
736         [0x38] = handle_io_inst,
737         [0x39] = handle_io_inst,
738         [0x3a] = handle_io_inst,
739         [0x3b] = handle_io_inst,
740         [0x3c] = handle_io_inst,
741         [0x50] = handle_ipte_interlock,
742         [0x5f] = handle_io_inst,
743         [0x74] = handle_io_inst,
744         [0x76] = handle_io_inst,
745         [0x7d] = handle_stsi,
746         [0xb1] = handle_stfl,
747         [0xb2] = handle_lpswe,
748 };
749 
750 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
751 {
752         intercept_handler_t handler;
753 
754         /*
755          * A lot of B2 instructions are priviledged. Here we check for
756          * the privileged ones, that we can handle in the kernel.
757          * Anything else goes to userspace.
758          */
759         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
760         if (handler)
761                 return handler(vcpu);
762 
763         return -EOPNOTSUPP;
764 }
765 
766 static int handle_epsw(struct kvm_vcpu *vcpu)
767 {
768         int reg1, reg2;
769 
770         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
771 
772         /* This basically extracts the mask half of the psw. */
773         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
774         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
775         if (reg2) {
776                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
777                 vcpu->run->s.regs.gprs[reg2] |=
778                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
779         }
780         return 0;
781 }
782 
783 #define PFMF_RESERVED   0xfffc0101UL
784 #define PFMF_SK         0x00020000UL
785 #define PFMF_CF         0x00010000UL
786 #define PFMF_UI         0x00008000UL
787 #define PFMF_FSC        0x00007000UL
788 #define PFMF_NQ         0x00000800UL
789 #define PFMF_MR         0x00000400UL
790 #define PFMF_MC         0x00000200UL
791 #define PFMF_KEY        0x000000feUL
792 
793 static int handle_pfmf(struct kvm_vcpu *vcpu)
794 {
795         bool mr = false, mc = false, nq;
796         int reg1, reg2;
797         unsigned long start, end;
798         unsigned char key;
799 
800         vcpu->stat.instruction_pfmf++;
801 
802         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
803 
804         if (!test_kvm_facility(vcpu->kvm, 8))
805                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
806 
807         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
808                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
809 
810         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
811                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
812 
813         /* Only provide non-quiescing support if enabled for the guest */
814         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
815             !test_kvm_facility(vcpu->kvm, 14))
816                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
817 
818         /* Only provide conditional-SSKE support if enabled for the guest */
819         if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
820             test_kvm_facility(vcpu->kvm, 10)) {
821                 mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
822                 mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
823         }
824 
825         nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
826         key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
827         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
828         start = kvm_s390_logical_to_effective(vcpu, start);
829 
830         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
831                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
832                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
833         }
834 
835         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
836         case 0x00000000:
837                 /* only 4k frames specify a real address */
838                 start = kvm_s390_real_to_abs(vcpu, start);
839                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
840                 break;
841         case 0x00001000:
842                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
843                 break;
844         case 0x00002000:
845                 /* only support 2G frame size if EDAT2 is available and we are
846                    not in 24-bit addressing mode */
847                 if (!test_kvm_facility(vcpu->kvm, 78) ||
848                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
849                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
850                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
851                 break;
852         default:
853                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
854         }
855 
856         while (start != end) {
857                 unsigned long useraddr;
858 
859                 /* Translate guest address to host address */
860                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
861                 if (kvm_is_error_hva(useraddr))
862                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
863 
864                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
865                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
866                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
867                 }
868 
869                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
870                         int rc = __skey_check_enable(vcpu);
871 
872                         if (rc)
873                                 return rc;
874                         down_read(&current->mm->mmap_sem);
875                         rc = cond_set_guest_storage_key(current->mm, useraddr,
876                                                         key, NULL, nq, mr, mc);
877                         up_read(&current->mm->mmap_sem);
878                         if (rc < 0)
879                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
880                 }
881 
882                 start += PAGE_SIZE;
883         }
884         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
885                 if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) {
886                         vcpu->run->s.regs.gprs[reg2] = end;
887                 } else {
888                         vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
889                         end = kvm_s390_logical_to_effective(vcpu, end);
890                         vcpu->run->s.regs.gprs[reg2] |= end;
891                 }
892         }
893         return 0;
894 }
895 
896 static int handle_essa(struct kvm_vcpu *vcpu)
897 {
898         /* entries expected to be 1FF */
899         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
900         unsigned long *cbrlo;
901         struct gmap *gmap;
902         int i;
903 
904         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
905         gmap = vcpu->arch.gmap;
906         vcpu->stat.instruction_essa++;
907         if (!vcpu->kvm->arch.use_cmma)
908                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
909 
910         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
911                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
912 
913         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
914                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
915 
916         /* Retry the ESSA instruction */
917         kvm_s390_retry_instr(vcpu);
918         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
919         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
920         down_read(&gmap->mm->mmap_sem);
921         for (i = 0; i < entries; ++i)
922                 __gmap_zap(gmap, cbrlo[i]);
923         up_read(&gmap->mm->mmap_sem);
924         return 0;
925 }
926 
927 static const intercept_handler_t b9_handlers[256] = {
928         [0x8a] = handle_ipte_interlock,
929         [0x8d] = handle_epsw,
930         [0x8e] = handle_ipte_interlock,
931         [0x8f] = handle_ipte_interlock,
932         [0xab] = handle_essa,
933         [0xaf] = handle_pfmf,
934 };
935 
936 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
937 {
938         intercept_handler_t handler;
939 
940         /* This is handled just as for the B2 instructions. */
941         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
942         if (handler)
943                 return handler(vcpu);
944 
945         return -EOPNOTSUPP;
946 }
947 
948 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
949 {
950         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
951         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
952         int reg, rc, nr_regs;
953         u32 ctl_array[16];
954         u64 ga;
955         ar_t ar;
956 
957         vcpu->stat.instruction_lctl++;
958 
959         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
960                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
961 
962         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
963 
964         if (ga & 3)
965                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
966 
967         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
968         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
969 
970         nr_regs = ((reg3 - reg1) & 0xf) + 1;
971         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
972         if (rc)
973                 return kvm_s390_inject_prog_cond(vcpu, rc);
974         reg = reg1;
975         nr_regs = 0;
976         do {
977                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
978                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
979                 if (reg == reg3)
980                         break;
981                 reg = (reg + 1) % 16;
982         } while (1);
983         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
984         return 0;
985 }
986 
987 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
988 {
989         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
990         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
991         int reg, rc, nr_regs;
992         u32 ctl_array[16];
993         u64 ga;
994         ar_t ar;
995 
996         vcpu->stat.instruction_stctl++;
997 
998         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
999                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1000 
1001         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1002 
1003         if (ga & 3)
1004                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1005 
1006         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1007         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1008 
1009         reg = reg1;
1010         nr_regs = 0;
1011         do {
1012                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1013                 if (reg == reg3)
1014                         break;
1015                 reg = (reg + 1) % 16;
1016         } while (1);
1017         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1018         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1019 }
1020 
1021 static int handle_lctlg(struct kvm_vcpu *vcpu)
1022 {
1023         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1024         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1025         int reg, rc, nr_regs;
1026         u64 ctl_array[16];
1027         u64 ga;
1028         ar_t ar;
1029 
1030         vcpu->stat.instruction_lctlg++;
1031 
1032         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1033                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1034 
1035         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1036 
1037         if (ga & 7)
1038                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1039 
1040         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1041         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1042 
1043         nr_regs = ((reg3 - reg1) & 0xf) + 1;
1044         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1045         if (rc)
1046                 return kvm_s390_inject_prog_cond(vcpu, rc);
1047         reg = reg1;
1048         nr_regs = 0;
1049         do {
1050                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1051                 if (reg == reg3)
1052                         break;
1053                 reg = (reg + 1) % 16;
1054         } while (1);
1055         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1056         return 0;
1057 }
1058 
1059 static int handle_stctg(struct kvm_vcpu *vcpu)
1060 {
1061         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1062         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1063         int reg, rc, nr_regs;
1064         u64 ctl_array[16];
1065         u64 ga;
1066         ar_t ar;
1067 
1068         vcpu->stat.instruction_stctg++;
1069 
1070         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1071                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1072 
1073         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1074 
1075         if (ga & 7)
1076                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1077 
1078         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1079         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1080 
1081         reg = reg1;
1082         nr_regs = 0;
1083         do {
1084                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1085                 if (reg == reg3)
1086                         break;
1087                 reg = (reg + 1) % 16;
1088         } while (1);
1089         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1090         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1091 }
1092 
1093 static const intercept_handler_t eb_handlers[256] = {
1094         [0x2f] = handle_lctlg,
1095         [0x25] = handle_stctg,
1096 };
1097 
1098 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1099 {
1100         intercept_handler_t handler;
1101 
1102         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
1103         if (handler)
1104                 return handler(vcpu);
1105         return -EOPNOTSUPP;
1106 }
1107 
1108 static int handle_tprot(struct kvm_vcpu *vcpu)
1109 {
1110         u64 address1, address2;
1111         unsigned long hva, gpa;
1112         int ret = 0, cc = 0;
1113         bool writable;
1114         ar_t ar;
1115 
1116         vcpu->stat.instruction_tprot++;
1117 
1118         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1119                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1120 
1121         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1122 
1123         /* we only handle the Linux memory detection case:
1124          * access key == 0
1125          * everything else goes to userspace. */
1126         if (address2 & 0xf0)
1127                 return -EOPNOTSUPP;
1128         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1129                 ipte_lock(vcpu);
1130         ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1131         if (ret == PGM_PROTECTION) {
1132                 /* Write protected? Try again with read-only... */
1133                 cc = 1;
1134                 ret = guest_translate_address(vcpu, address1, ar, &gpa,
1135                                               GACC_FETCH);
1136         }
1137         if (ret) {
1138                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1139                         ret = kvm_s390_inject_program_int(vcpu, ret);
1140                 } else if (ret > 0) {
1141                         /* Translation not available */
1142                         kvm_s390_set_psw_cc(vcpu, 3);
1143                         ret = 0;
1144                 }
1145                 goto out_unlock;
1146         }
1147 
1148         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1149         if (kvm_is_error_hva(hva)) {
1150                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1151         } else {
1152                 if (!writable)
1153                         cc = 1;         /* Write not permitted ==> read-only */
1154                 kvm_s390_set_psw_cc(vcpu, cc);
1155                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1156         }
1157 out_unlock:
1158         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1159                 ipte_unlock(vcpu);
1160         return ret;
1161 }
1162 
1163 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1164 {
1165         /* For e5xx... instructions we only handle TPROT */
1166         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1167                 return handle_tprot(vcpu);
1168         return -EOPNOTSUPP;
1169 }
1170 
1171 static int handle_sckpf(struct kvm_vcpu *vcpu)
1172 {
1173         u32 value;
1174 
1175         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1176                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1177 
1178         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1179                 return kvm_s390_inject_program_int(vcpu,
1180                                                    PGM_SPECIFICATION);
1181 
1182         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1183         vcpu->arch.sie_block->todpr = value;
1184 
1185         return 0;
1186 }
1187 
1188 static int handle_ptff(struct kvm_vcpu *vcpu)
1189 {
1190         /* we don't emulate any control instructions yet */
1191         kvm_s390_set_psw_cc(vcpu, 3);
1192         return 0;
1193 }
1194 
1195 static const intercept_handler_t x01_handlers[256] = {
1196         [0x04] = handle_ptff,
1197         [0x07] = handle_sckpf,
1198 };
1199 
1200 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1201 {
1202         intercept_handler_t handler;
1203 
1204         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1205         if (handler)
1206                 return handler(vcpu);
1207         return -EOPNOTSUPP;
1208 }
1209 

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