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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/io.h>
 27 #include <asm/ptrace.h>
 28 #include <asm/compat.h>
 29 #include "gaccess.h"
 30 #include "kvm-s390.h"
 31 #include "trace.h"
 32 
 33 /* Handle SCK (SET CLOCK) interception */
 34 static int handle_set_clock(struct kvm_vcpu *vcpu)
 35 {
 36         int rc;
 37         ar_t ar;
 38         u64 op2, val;
 39 
 40         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 41                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 42 
 43         op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 44         if (op2 & 7)    /* Operand must be on a doubleword boundary */
 45                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 46         rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
 47         if (rc)
 48                 return kvm_s390_inject_prog_cond(vcpu, rc);
 49 
 50         VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
 51         kvm_s390_set_tod_clock(vcpu->kvm, val);
 52 
 53         kvm_s390_set_psw_cc(vcpu, 0);
 54         return 0;
 55 }
 56 
 57 static int handle_set_prefix(struct kvm_vcpu *vcpu)
 58 {
 59         u64 operand2;
 60         u32 address;
 61         int rc;
 62         ar_t ar;
 63 
 64         vcpu->stat.instruction_spx++;
 65 
 66         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
 67                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
 68 
 69         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
 70 
 71         /* must be word boundary */
 72         if (operand2 & 3)
 73                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 74 
 75         /* get the value */
 76         rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
 77         if (rc)
 78                 return kvm_s390_inject_prog_cond(vcpu, rc);
 79 
 80         address &= 0x7fffe000u;
 81 
 82         /*
 83          * Make sure the new value is valid memory. We only need to check the
 84          * first page, since address is 8k aligned and memory pieces are always
 85          * at least 1MB aligned and have at least a size of 1MB.
 86          */
 87         if (kvm_is_error_gpa(vcpu->kvm, address))
 88                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 89 
 90         kvm_s390_set_prefix(vcpu, address);
 91         trace_kvm_s390_handle_prefix(vcpu, 1, address);
 92         return 0;
 93 }
 94 
 95 static int handle_store_prefix(struct kvm_vcpu *vcpu)
 96 {
 97         u64 operand2;
 98         u32 address;
 99         int rc;
100         ar_t ar;
101 
102         vcpu->stat.instruction_stpx++;
103 
104         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
105                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
106 
107         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
108 
109         /* must be word boundary */
110         if (operand2 & 3)
111                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
112 
113         address = kvm_s390_get_prefix(vcpu);
114 
115         /* get the value */
116         rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
117         if (rc)
118                 return kvm_s390_inject_prog_cond(vcpu, rc);
119 
120         VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
121         trace_kvm_s390_handle_prefix(vcpu, 0, address);
122         return 0;
123 }
124 
125 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
126 {
127         u16 vcpu_id = vcpu->vcpu_id;
128         u64 ga;
129         int rc;
130         ar_t ar;
131 
132         vcpu->stat.instruction_stap++;
133 
134         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
135                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
136 
137         ga = kvm_s390_get_base_disp_s(vcpu, &ar);
138 
139         if (ga & 1)
140                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
141 
142         rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
143         if (rc)
144                 return kvm_s390_inject_prog_cond(vcpu, rc);
145 
146         VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
147         trace_kvm_s390_handle_stap(vcpu, ga);
148         return 0;
149 }
150 
151 static int __skey_check_enable(struct kvm_vcpu *vcpu)
152 {
153         int rc = 0;
154         if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
155                 return rc;
156 
157         rc = s390_enable_skey();
158         VCPU_EVENT(vcpu, 3, "%s", "enabling storage keys for guest");
159         trace_kvm_s390_skey_related_inst(vcpu);
160         vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
161         return rc;
162 }
163 
164 
165 static int handle_skey(struct kvm_vcpu *vcpu)
166 {
167         int rc = __skey_check_enable(vcpu);
168 
169         if (rc)
170                 return rc;
171         vcpu->stat.instruction_storage_key++;
172 
173         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
174                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
175 
176         kvm_s390_rewind_psw(vcpu, 4);
177         VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
178         return 0;
179 }
180 
181 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
182 {
183         vcpu->stat.instruction_ipte_interlock++;
184         if (psw_bits(vcpu->arch.sie_block->gpsw).p)
185                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
186         wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
187         kvm_s390_rewind_psw(vcpu, 4);
188         VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
189         return 0;
190 }
191 
192 static int handle_test_block(struct kvm_vcpu *vcpu)
193 {
194         gpa_t addr;
195         int reg2;
196 
197         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
198                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
199 
200         kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
201         addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
202         addr = kvm_s390_logical_to_effective(vcpu, addr);
203         if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
204                 return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
205         addr = kvm_s390_real_to_abs(vcpu, addr);
206 
207         if (kvm_is_error_gpa(vcpu->kvm, addr))
208                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
209         /*
210          * We don't expect errors on modern systems, and do not care
211          * about storage keys (yet), so let's just clear the page.
212          */
213         if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
214                 return -EFAULT;
215         kvm_s390_set_psw_cc(vcpu, 0);
216         vcpu->run->s.regs.gprs[0] = 0;
217         return 0;
218 }
219 
220 static int handle_tpi(struct kvm_vcpu *vcpu)
221 {
222         struct kvm_s390_interrupt_info *inti;
223         unsigned long len;
224         u32 tpi_data[3];
225         int rc;
226         u64 addr;
227         ar_t ar;
228 
229         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
230         if (addr & 3)
231                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
232 
233         inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
234         if (!inti) {
235                 kvm_s390_set_psw_cc(vcpu, 0);
236                 return 0;
237         }
238 
239         tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
240         tpi_data[1] = inti->io.io_int_parm;
241         tpi_data[2] = inti->io.io_int_word;
242         if (addr) {
243                 /*
244                  * Store the two-word I/O interruption code into the
245                  * provided area.
246                  */
247                 len = sizeof(tpi_data) - 4;
248                 rc = write_guest(vcpu, addr, ar, &tpi_data, len);
249                 if (rc) {
250                         rc = kvm_s390_inject_prog_cond(vcpu, rc);
251                         goto reinject_interrupt;
252                 }
253         } else {
254                 /*
255                  * Store the three-word I/O interruption code into
256                  * the appropriate lowcore area.
257                  */
258                 len = sizeof(tpi_data);
259                 if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
260                         /* failed writes to the low core are not recoverable */
261                         rc = -EFAULT;
262                         goto reinject_interrupt;
263                 }
264         }
265 
266         /* irq was successfully handed to the guest */
267         kfree(inti);
268         kvm_s390_set_psw_cc(vcpu, 1);
269         return 0;
270 reinject_interrupt:
271         /*
272          * If we encounter a problem storing the interruption code, the
273          * instruction is suppressed from the guest's view: reinject the
274          * interrupt.
275          */
276         if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
277                 kfree(inti);
278                 rc = -EFAULT;
279         }
280         /* don't set the cc, a pgm irq was injected or we drop to user space */
281         return rc ? -EFAULT : 0;
282 }
283 
284 static int handle_tsch(struct kvm_vcpu *vcpu)
285 {
286         struct kvm_s390_interrupt_info *inti = NULL;
287         const u64 isc_mask = 0xffUL << 24; /* all iscs set */
288 
289         /* a valid schid has at least one bit set */
290         if (vcpu->run->s.regs.gprs[1])
291                 inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
292                                            vcpu->run->s.regs.gprs[1]);
293 
294         /*
295          * Prepare exit to userspace.
296          * We indicate whether we dequeued a pending I/O interrupt
297          * so that userspace can re-inject it if the instruction gets
298          * a program check. While this may re-order the pending I/O
299          * interrupts, this is no problem since the priority is kept
300          * intact.
301          */
302         vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
303         vcpu->run->s390_tsch.dequeued = !!inti;
304         if (inti) {
305                 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
306                 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
307                 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
308                 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
309         }
310         vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
311         kfree(inti);
312         return -EREMOTE;
313 }
314 
315 static int handle_io_inst(struct kvm_vcpu *vcpu)
316 {
317         VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
318 
319         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
320                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
321 
322         if (vcpu->kvm->arch.css_support) {
323                 /*
324                  * Most I/O instructions will be handled by userspace.
325                  * Exceptions are tpi and the interrupt portion of tsch.
326                  */
327                 if (vcpu->arch.sie_block->ipa == 0xb236)
328                         return handle_tpi(vcpu);
329                 if (vcpu->arch.sie_block->ipa == 0xb235)
330                         return handle_tsch(vcpu);
331                 /* Handle in userspace. */
332                 return -EOPNOTSUPP;
333         } else {
334                 /*
335                  * Set condition code 3 to stop the guest from issuing channel
336                  * I/O instructions.
337                  */
338                 kvm_s390_set_psw_cc(vcpu, 3);
339                 return 0;
340         }
341 }
342 
343 static int handle_stfl(struct kvm_vcpu *vcpu)
344 {
345         int rc;
346         unsigned int fac;
347 
348         vcpu->stat.instruction_stfl++;
349 
350         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
351                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
352 
353         /*
354          * We need to shift the lower 32 facility bits (bit 0-31) from a u64
355          * into a u32 memory representation. They will remain bits 0-31.
356          */
357         fac = *vcpu->kvm->arch.model.fac->list >> 32;
358         rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
359                             &fac, sizeof(fac));
360         if (rc)
361                 return rc;
362         VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
363         trace_kvm_s390_handle_stfl(vcpu, fac);
364         return 0;
365 }
366 
367 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
368 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
369 #define PSW_ADDR_24 0x0000000000ffffffUL
370 #define PSW_ADDR_31 0x000000007fffffffUL
371 
372 int is_valid_psw(psw_t *psw)
373 {
374         if (psw->mask & PSW_MASK_UNASSIGNED)
375                 return 0;
376         if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
377                 if (psw->addr & ~PSW_ADDR_31)
378                         return 0;
379         }
380         if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
381                 return 0;
382         if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
383                 return 0;
384         if (psw->addr & 1)
385                 return 0;
386         return 1;
387 }
388 
389 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
390 {
391         psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
392         psw_compat_t new_psw;
393         u64 addr;
394         int rc;
395         ar_t ar;
396 
397         if (gpsw->mask & PSW_MASK_PSTATE)
398                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
399 
400         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
401         if (addr & 7)
402                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
403 
404         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
405         if (rc)
406                 return kvm_s390_inject_prog_cond(vcpu, rc);
407         if (!(new_psw.mask & PSW32_MASK_BASE))
408                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
409         gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
410         gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
411         gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
412         if (!is_valid_psw(gpsw))
413                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
414         return 0;
415 }
416 
417 static int handle_lpswe(struct kvm_vcpu *vcpu)
418 {
419         psw_t new_psw;
420         u64 addr;
421         int rc;
422         ar_t ar;
423 
424         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
425                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
426 
427         addr = kvm_s390_get_base_disp_s(vcpu, &ar);
428         if (addr & 7)
429                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
430         rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
431         if (rc)
432                 return kvm_s390_inject_prog_cond(vcpu, rc);
433         vcpu->arch.sie_block->gpsw = new_psw;
434         if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
435                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
436         return 0;
437 }
438 
439 static int handle_stidp(struct kvm_vcpu *vcpu)
440 {
441         u64 stidp_data = vcpu->arch.stidp_data;
442         u64 operand2;
443         int rc;
444         ar_t ar;
445 
446         vcpu->stat.instruction_stidp++;
447 
448         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
449                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
450 
451         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
452 
453         if (operand2 & 7)
454                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
455 
456         rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
457         if (rc)
458                 return kvm_s390_inject_prog_cond(vcpu, rc);
459 
460         VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
461         return 0;
462 }
463 
464 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
465 {
466         int cpus = 0;
467         int n;
468 
469         cpus = atomic_read(&vcpu->kvm->online_vcpus);
470 
471         /* deal with other level 3 hypervisors */
472         if (stsi(mem, 3, 2, 2))
473                 mem->count = 0;
474         if (mem->count < 8)
475                 mem->count++;
476         for (n = mem->count - 1; n > 0 ; n--)
477                 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
478 
479         memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
480         mem->vm[0].cpus_total = cpus;
481         mem->vm[0].cpus_configured = cpus;
482         mem->vm[0].cpus_standby = 0;
483         mem->vm[0].cpus_reserved = 0;
484         mem->vm[0].caf = 1000;
485         memcpy(mem->vm[0].name, "KVMguest", 8);
486         ASCEBC(mem->vm[0].name, 8);
487         memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
488         ASCEBC(mem->vm[0].cpi, 16);
489 }
490 
491 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
492                                  u8 fc, u8 sel1, u16 sel2)
493 {
494         vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
495         vcpu->run->s390_stsi.addr = addr;
496         vcpu->run->s390_stsi.ar = ar;
497         vcpu->run->s390_stsi.fc = fc;
498         vcpu->run->s390_stsi.sel1 = sel1;
499         vcpu->run->s390_stsi.sel2 = sel2;
500 }
501 
502 static int handle_stsi(struct kvm_vcpu *vcpu)
503 {
504         int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
505         int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
506         int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
507         unsigned long mem = 0;
508         u64 operand2;
509         int rc = 0;
510         ar_t ar;
511 
512         vcpu->stat.instruction_stsi++;
513         VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
514 
515         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
516                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
517 
518         if (fc > 3) {
519                 kvm_s390_set_psw_cc(vcpu, 3);
520                 return 0;
521         }
522 
523         if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
524             || vcpu->run->s.regs.gprs[1] & 0xffff0000)
525                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
526 
527         if (fc == 0) {
528                 vcpu->run->s.regs.gprs[0] = 3 << 28;
529                 kvm_s390_set_psw_cc(vcpu, 0);
530                 return 0;
531         }
532 
533         operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
534 
535         if (operand2 & 0xfff)
536                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
537 
538         switch (fc) {
539         case 1: /* same handling for 1 and 2 */
540         case 2:
541                 mem = get_zeroed_page(GFP_KERNEL);
542                 if (!mem)
543                         goto out_no_data;
544                 if (stsi((void *) mem, fc, sel1, sel2))
545                         goto out_no_data;
546                 break;
547         case 3:
548                 if (sel1 != 2 || sel2 != 2)
549                         goto out_no_data;
550                 mem = get_zeroed_page(GFP_KERNEL);
551                 if (!mem)
552                         goto out_no_data;
553                 handle_stsi_3_2_2(vcpu, (void *) mem);
554                 break;
555         }
556 
557         rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
558         if (rc) {
559                 rc = kvm_s390_inject_prog_cond(vcpu, rc);
560                 goto out;
561         }
562         if (vcpu->kvm->arch.user_stsi) {
563                 insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
564                 rc = -EREMOTE;
565         }
566         trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
567         free_page(mem);
568         kvm_s390_set_psw_cc(vcpu, 0);
569         vcpu->run->s.regs.gprs[0] = 0;
570         return rc;
571 out_no_data:
572         kvm_s390_set_psw_cc(vcpu, 3);
573 out:
574         free_page(mem);
575         return rc;
576 }
577 
578 static const intercept_handler_t b2_handlers[256] = {
579         [0x02] = handle_stidp,
580         [0x04] = handle_set_clock,
581         [0x10] = handle_set_prefix,
582         [0x11] = handle_store_prefix,
583         [0x12] = handle_store_cpu_address,
584         [0x21] = handle_ipte_interlock,
585         [0x29] = handle_skey,
586         [0x2a] = handle_skey,
587         [0x2b] = handle_skey,
588         [0x2c] = handle_test_block,
589         [0x30] = handle_io_inst,
590         [0x31] = handle_io_inst,
591         [0x32] = handle_io_inst,
592         [0x33] = handle_io_inst,
593         [0x34] = handle_io_inst,
594         [0x35] = handle_io_inst,
595         [0x36] = handle_io_inst,
596         [0x37] = handle_io_inst,
597         [0x38] = handle_io_inst,
598         [0x39] = handle_io_inst,
599         [0x3a] = handle_io_inst,
600         [0x3b] = handle_io_inst,
601         [0x3c] = handle_io_inst,
602         [0x50] = handle_ipte_interlock,
603         [0x5f] = handle_io_inst,
604         [0x74] = handle_io_inst,
605         [0x76] = handle_io_inst,
606         [0x7d] = handle_stsi,
607         [0xb1] = handle_stfl,
608         [0xb2] = handle_lpswe,
609 };
610 
611 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
612 {
613         intercept_handler_t handler;
614 
615         /*
616          * A lot of B2 instructions are priviledged. Here we check for
617          * the privileged ones, that we can handle in the kernel.
618          * Anything else goes to userspace.
619          */
620         handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
621         if (handler)
622                 return handler(vcpu);
623 
624         return -EOPNOTSUPP;
625 }
626 
627 static int handle_epsw(struct kvm_vcpu *vcpu)
628 {
629         int reg1, reg2;
630 
631         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
632 
633         /* This basically extracts the mask half of the psw. */
634         vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
635         vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
636         if (reg2) {
637                 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
638                 vcpu->run->s.regs.gprs[reg2] |=
639                         vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
640         }
641         return 0;
642 }
643 
644 #define PFMF_RESERVED   0xfffc0101UL
645 #define PFMF_SK         0x00020000UL
646 #define PFMF_CF         0x00010000UL
647 #define PFMF_UI         0x00008000UL
648 #define PFMF_FSC        0x00007000UL
649 #define PFMF_NQ         0x00000800UL
650 #define PFMF_MR         0x00000400UL
651 #define PFMF_MC         0x00000200UL
652 #define PFMF_KEY        0x000000feUL
653 
654 static int handle_pfmf(struct kvm_vcpu *vcpu)
655 {
656         int reg1, reg2;
657         unsigned long start, end;
658 
659         vcpu->stat.instruction_pfmf++;
660 
661         kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
662 
663         if (!test_kvm_facility(vcpu->kvm, 8))
664                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
665 
666         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
667                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
668 
669         if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
670                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
671 
672         /* Only provide non-quiescing support if the host supports it */
673         if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
674                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
675 
676         /* No support for conditional-SSKE */
677         if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
678                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
679 
680         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
681         start = kvm_s390_logical_to_effective(vcpu, start);
682 
683         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
684         case 0x00000000:
685                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
686                 break;
687         case 0x00001000:
688                 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
689                 break;
690         case 0x00002000:
691                 /* only support 2G frame size if EDAT2 is available and we are
692                    not in 24-bit addressing mode */
693                 if (!test_kvm_facility(vcpu->kvm, 78) ||
694                     psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
695                         return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
696                 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
697                 break;
698         default:
699                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
700         }
701 
702         if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
703                 if (kvm_s390_check_low_addr_prot_real(vcpu, start))
704                         return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
705         }
706 
707         while (start < end) {
708                 unsigned long useraddr, abs_addr;
709 
710                 /* Translate guest address to host address */
711                 if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
712                         abs_addr = kvm_s390_real_to_abs(vcpu, start);
713                 else
714                         abs_addr = start;
715                 useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
716                 if (kvm_is_error_hva(useraddr))
717                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
718 
719                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
720                         if (clear_user((void __user *)useraddr, PAGE_SIZE))
721                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
722                 }
723 
724                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
725                         int rc = __skey_check_enable(vcpu);
726 
727                         if (rc)
728                                 return rc;
729                         if (set_guest_storage_key(current->mm, useraddr,
730                                         vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
731                                         vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
732                                 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
733                 }
734 
735                 start += PAGE_SIZE;
736         }
737         if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
738                 vcpu->run->s.regs.gprs[reg2] = end;
739         return 0;
740 }
741 
742 static int handle_essa(struct kvm_vcpu *vcpu)
743 {
744         /* entries expected to be 1FF */
745         int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
746         unsigned long *cbrlo, cbrle;
747         struct gmap *gmap;
748         int i;
749 
750         VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
751         gmap = vcpu->arch.gmap;
752         vcpu->stat.instruction_essa++;
753         if (!vcpu->kvm->arch.use_cmma)
754                 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
755 
756         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
757                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
758 
759         if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
760                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
761 
762         /* Rewind PSW to repeat the ESSA instruction */
763         kvm_s390_rewind_psw(vcpu, 4);
764         vcpu->arch.sie_block->cbrlo &= PAGE_MASK;       /* reset nceo */
765         cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
766         down_read(&gmap->mm->mmap_sem);
767         for (i = 0; i < entries; ++i) {
768                 cbrle = cbrlo[i];
769                 if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
770                         /* invalid entry */
771                         break;
772                 /* try to free backing */
773                 __gmap_zap(gmap, cbrle);
774         }
775         up_read(&gmap->mm->mmap_sem);
776         if (i < entries)
777                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
778         return 0;
779 }
780 
781 static const intercept_handler_t b9_handlers[256] = {
782         [0x8a] = handle_ipte_interlock,
783         [0x8d] = handle_epsw,
784         [0x8e] = handle_ipte_interlock,
785         [0x8f] = handle_ipte_interlock,
786         [0xab] = handle_essa,
787         [0xaf] = handle_pfmf,
788 };
789 
790 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
791 {
792         intercept_handler_t handler;
793 
794         /* This is handled just as for the B2 instructions. */
795         handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
796         if (handler)
797                 return handler(vcpu);
798 
799         return -EOPNOTSUPP;
800 }
801 
802 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
803 {
804         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
805         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
806         int reg, rc, nr_regs;
807         u32 ctl_array[16];
808         u64 ga;
809         ar_t ar;
810 
811         vcpu->stat.instruction_lctl++;
812 
813         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
814                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
815 
816         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
817 
818         if (ga & 3)
819                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
820 
821         VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
822         trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
823 
824         nr_regs = ((reg3 - reg1) & 0xf) + 1;
825         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
826         if (rc)
827                 return kvm_s390_inject_prog_cond(vcpu, rc);
828         reg = reg1;
829         nr_regs = 0;
830         do {
831                 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
832                 vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
833                 if (reg == reg3)
834                         break;
835                 reg = (reg + 1) % 16;
836         } while (1);
837         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
838         return 0;
839 }
840 
841 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
842 {
843         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
844         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
845         int reg, rc, nr_regs;
846         u32 ctl_array[16];
847         u64 ga;
848         ar_t ar;
849 
850         vcpu->stat.instruction_stctl++;
851 
852         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
853                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
854 
855         ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
856 
857         if (ga & 3)
858                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
859 
860         VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
861         trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
862 
863         reg = reg1;
864         nr_regs = 0;
865         do {
866                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
867                 if (reg == reg3)
868                         break;
869                 reg = (reg + 1) % 16;
870         } while (1);
871         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
872         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
873 }
874 
875 static int handle_lctlg(struct kvm_vcpu *vcpu)
876 {
877         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
878         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
879         int reg, rc, nr_regs;
880         u64 ctl_array[16];
881         u64 ga;
882         ar_t ar;
883 
884         vcpu->stat.instruction_lctlg++;
885 
886         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
887                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
888 
889         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
890 
891         if (ga & 7)
892                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
893 
894         VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
895         trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
896 
897         nr_regs = ((reg3 - reg1) & 0xf) + 1;
898         rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
899         if (rc)
900                 return kvm_s390_inject_prog_cond(vcpu, rc);
901         reg = reg1;
902         nr_regs = 0;
903         do {
904                 vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
905                 if (reg == reg3)
906                         break;
907                 reg = (reg + 1) % 16;
908         } while (1);
909         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
910         return 0;
911 }
912 
913 static int handle_stctg(struct kvm_vcpu *vcpu)
914 {
915         int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
916         int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
917         int reg, rc, nr_regs;
918         u64 ctl_array[16];
919         u64 ga;
920         ar_t ar;
921 
922         vcpu->stat.instruction_stctg++;
923 
924         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
925                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
926 
927         ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
928 
929         if (ga & 7)
930                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
931 
932         VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
933         trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
934 
935         reg = reg1;
936         nr_regs = 0;
937         do {
938                 ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
939                 if (reg == reg3)
940                         break;
941                 reg = (reg + 1) % 16;
942         } while (1);
943         rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
944         return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
945 }
946 
947 static const intercept_handler_t eb_handlers[256] = {
948         [0x2f] = handle_lctlg,
949         [0x25] = handle_stctg,
950 };
951 
952 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
953 {
954         intercept_handler_t handler;
955 
956         handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
957         if (handler)
958                 return handler(vcpu);
959         return -EOPNOTSUPP;
960 }
961 
962 static int handle_tprot(struct kvm_vcpu *vcpu)
963 {
964         u64 address1, address2;
965         unsigned long hva, gpa;
966         int ret = 0, cc = 0;
967         bool writable;
968         ar_t ar;
969 
970         vcpu->stat.instruction_tprot++;
971 
972         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
973                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
974 
975         kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
976 
977         /* we only handle the Linux memory detection case:
978          * access key == 0
979          * everything else goes to userspace. */
980         if (address2 & 0xf0)
981                 return -EOPNOTSUPP;
982         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
983                 ipte_lock(vcpu);
984         ret = guest_translate_address(vcpu, address1, ar, &gpa, 1);
985         if (ret == PGM_PROTECTION) {
986                 /* Write protected? Try again with read-only... */
987                 cc = 1;
988                 ret = guest_translate_address(vcpu, address1, ar, &gpa, 0);
989         }
990         if (ret) {
991                 if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
992                         ret = kvm_s390_inject_program_int(vcpu, ret);
993                 } else if (ret > 0) {
994                         /* Translation not available */
995                         kvm_s390_set_psw_cc(vcpu, 3);
996                         ret = 0;
997                 }
998                 goto out_unlock;
999         }
1000 
1001         hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1002         if (kvm_is_error_hva(hva)) {
1003                 ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1004         } else {
1005                 if (!writable)
1006                         cc = 1;         /* Write not permitted ==> read-only */
1007                 kvm_s390_set_psw_cc(vcpu, cc);
1008                 /* Note: CC2 only occurs for storage keys (not supported yet) */
1009         }
1010 out_unlock:
1011         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1012                 ipte_unlock(vcpu);
1013         return ret;
1014 }
1015 
1016 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1017 {
1018         /* For e5xx... instructions we only handle TPROT */
1019         if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1020                 return handle_tprot(vcpu);
1021         return -EOPNOTSUPP;
1022 }
1023 
1024 static int handle_sckpf(struct kvm_vcpu *vcpu)
1025 {
1026         u32 value;
1027 
1028         if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1029                 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1030 
1031         if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1032                 return kvm_s390_inject_program_int(vcpu,
1033                                                    PGM_SPECIFICATION);
1034 
1035         value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1036         vcpu->arch.sie_block->todpr = value;
1037 
1038         return 0;
1039 }
1040 
1041 static const intercept_handler_t x01_handlers[256] = {
1042         [0x07] = handle_sckpf,
1043 };
1044 
1045 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1046 {
1047         intercept_handler_t handler;
1048 
1049         handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1050         if (handler)
1051                 return handler(vcpu);
1052         return -EOPNOTSUPP;
1053 }
1054 

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