xref: /openbmc/linux/arch/s390/kvm/priv.c (revision 82003e04)
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 static int handle_ri(struct kvm_vcpu *vcpu)
36 {
37 	if (test_kvm_facility(vcpu->kvm, 64)) {
38 		vcpu->arch.sie_block->ecb3 |= 0x01;
39 		kvm_s390_retry_instr(vcpu);
40 		return 0;
41 	} else
42 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
43 }
44 
45 int kvm_s390_handle_aa(struct kvm_vcpu *vcpu)
46 {
47 	if ((vcpu->arch.sie_block->ipa & 0xf) <= 4)
48 		return handle_ri(vcpu);
49 	else
50 		return -EOPNOTSUPP;
51 }
52 
53 /* Handle SCK (SET CLOCK) interception */
54 static int handle_set_clock(struct kvm_vcpu *vcpu)
55 {
56 	int rc;
57 	ar_t ar;
58 	u64 op2, val;
59 
60 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
61 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
62 
63 	op2 = kvm_s390_get_base_disp_s(vcpu, &ar);
64 	if (op2 & 7)	/* Operand must be on a doubleword boundary */
65 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
66 	rc = read_guest(vcpu, op2, ar, &val, sizeof(val));
67 	if (rc)
68 		return kvm_s390_inject_prog_cond(vcpu, rc);
69 
70 	VCPU_EVENT(vcpu, 3, "SCK: setting guest TOD to 0x%llx", val);
71 	kvm_s390_set_tod_clock(vcpu->kvm, val);
72 
73 	kvm_s390_set_psw_cc(vcpu, 0);
74 	return 0;
75 }
76 
77 static int handle_set_prefix(struct kvm_vcpu *vcpu)
78 {
79 	u64 operand2;
80 	u32 address;
81 	int rc;
82 	ar_t ar;
83 
84 	vcpu->stat.instruction_spx++;
85 
86 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
87 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
88 
89 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
90 
91 	/* must be word boundary */
92 	if (operand2 & 3)
93 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
94 
95 	/* get the value */
96 	rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
97 	if (rc)
98 		return kvm_s390_inject_prog_cond(vcpu, rc);
99 
100 	address &= 0x7fffe000u;
101 
102 	/*
103 	 * Make sure the new value is valid memory. We only need to check the
104 	 * first page, since address is 8k aligned and memory pieces are always
105 	 * at least 1MB aligned and have at least a size of 1MB.
106 	 */
107 	if (kvm_is_error_gpa(vcpu->kvm, address))
108 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
109 
110 	kvm_s390_set_prefix(vcpu, address);
111 	trace_kvm_s390_handle_prefix(vcpu, 1, address);
112 	return 0;
113 }
114 
115 static int handle_store_prefix(struct kvm_vcpu *vcpu)
116 {
117 	u64 operand2;
118 	u32 address;
119 	int rc;
120 	ar_t ar;
121 
122 	vcpu->stat.instruction_stpx++;
123 
124 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
125 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
126 
127 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
128 
129 	/* must be word boundary */
130 	if (operand2 & 3)
131 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
132 
133 	address = kvm_s390_get_prefix(vcpu);
134 
135 	/* get the value */
136 	rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
137 	if (rc)
138 		return kvm_s390_inject_prog_cond(vcpu, rc);
139 
140 	VCPU_EVENT(vcpu, 3, "STPX: storing prefix 0x%x into 0x%llx", address, operand2);
141 	trace_kvm_s390_handle_prefix(vcpu, 0, address);
142 	return 0;
143 }
144 
145 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
146 {
147 	u16 vcpu_id = vcpu->vcpu_id;
148 	u64 ga;
149 	int rc;
150 	ar_t ar;
151 
152 	vcpu->stat.instruction_stap++;
153 
154 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
155 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
156 
157 	ga = kvm_s390_get_base_disp_s(vcpu, &ar);
158 
159 	if (ga & 1)
160 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
161 
162 	rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
163 	if (rc)
164 		return kvm_s390_inject_prog_cond(vcpu, rc);
165 
166 	VCPU_EVENT(vcpu, 3, "STAP: storing cpu address (%u) to 0x%llx", vcpu_id, ga);
167 	trace_kvm_s390_handle_stap(vcpu, ga);
168 	return 0;
169 }
170 
171 static int __skey_check_enable(struct kvm_vcpu *vcpu)
172 {
173 	int rc = 0;
174 
175 	trace_kvm_s390_skey_related_inst(vcpu);
176 	if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
177 		return rc;
178 
179 	rc = s390_enable_skey();
180 	VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
181 	if (!rc)
182 		vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
183 	return rc;
184 }
185 
186 static int try_handle_skey(struct kvm_vcpu *vcpu)
187 {
188 	int rc;
189 
190 	vcpu->stat.instruction_storage_key++;
191 	rc = __skey_check_enable(vcpu);
192 	if (rc)
193 		return rc;
194 	if (sclp.has_skey) {
195 		/* with storage-key facility, SIE interprets it for us */
196 		kvm_s390_retry_instr(vcpu);
197 		VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
198 		return -EAGAIN;
199 	}
200 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
201 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
202 	return 0;
203 }
204 
205 static int handle_iske(struct kvm_vcpu *vcpu)
206 {
207 	unsigned long addr;
208 	unsigned char key;
209 	int reg1, reg2;
210 	int rc;
211 
212 	rc = try_handle_skey(vcpu);
213 	if (rc)
214 		return rc != -EAGAIN ? rc : 0;
215 
216 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
217 
218 	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
219 	addr = kvm_s390_logical_to_effective(vcpu, addr);
220 	addr = kvm_s390_real_to_abs(vcpu, addr);
221 	addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
222 	if (kvm_is_error_hva(addr))
223 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
224 
225 	down_read(&current->mm->mmap_sem);
226 	rc = get_guest_storage_key(current->mm, addr, &key);
227 	up_read(&current->mm->mmap_sem);
228 	if (rc)
229 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
230 	vcpu->run->s.regs.gprs[reg1] &= ~0xff;
231 	vcpu->run->s.regs.gprs[reg1] |= key;
232 	return 0;
233 }
234 
235 static int handle_rrbe(struct kvm_vcpu *vcpu)
236 {
237 	unsigned long addr;
238 	int reg1, reg2;
239 	int rc;
240 
241 	rc = try_handle_skey(vcpu);
242 	if (rc)
243 		return rc != -EAGAIN ? rc : 0;
244 
245 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
246 
247 	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
248 	addr = kvm_s390_logical_to_effective(vcpu, addr);
249 	addr = kvm_s390_real_to_abs(vcpu, addr);
250 	addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
251 	if (kvm_is_error_hva(addr))
252 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
253 
254 	down_read(&current->mm->mmap_sem);
255 	rc = reset_guest_reference_bit(current->mm, addr);
256 	up_read(&current->mm->mmap_sem);
257 	if (rc < 0)
258 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
259 
260 	kvm_s390_set_psw_cc(vcpu, rc);
261 	return 0;
262 }
263 
264 #define SSKE_NQ 0x8
265 #define SSKE_MR 0x4
266 #define SSKE_MC 0x2
267 #define SSKE_MB 0x1
268 static int handle_sske(struct kvm_vcpu *vcpu)
269 {
270 	unsigned char m3 = vcpu->arch.sie_block->ipb >> 28;
271 	unsigned long start, end;
272 	unsigned char key, oldkey;
273 	int reg1, reg2;
274 	int rc;
275 
276 	rc = try_handle_skey(vcpu);
277 	if (rc)
278 		return rc != -EAGAIN ? rc : 0;
279 
280 	if (!test_kvm_facility(vcpu->kvm, 8))
281 		m3 &= ~SSKE_MB;
282 	if (!test_kvm_facility(vcpu->kvm, 10))
283 		m3 &= ~(SSKE_MC | SSKE_MR);
284 	if (!test_kvm_facility(vcpu->kvm, 14))
285 		m3 &= ~SSKE_NQ;
286 
287 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
288 
289 	key = vcpu->run->s.regs.gprs[reg1] & 0xfe;
290 	start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
291 	start = kvm_s390_logical_to_effective(vcpu, start);
292 	if (m3 & SSKE_MB) {
293 		/* start already designates an absolute address */
294 		end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
295 	} else {
296 		start = kvm_s390_real_to_abs(vcpu, start);
297 		end = start + PAGE_SIZE;
298 	}
299 
300 	while (start != end) {
301 		unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
302 
303 		if (kvm_is_error_hva(addr))
304 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
305 
306 		down_read(&current->mm->mmap_sem);
307 		rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
308 						m3 & SSKE_NQ, m3 & SSKE_MR,
309 						m3 & SSKE_MC);
310 		up_read(&current->mm->mmap_sem);
311 		if (rc < 0)
312 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
313 		start += PAGE_SIZE;
314 	};
315 
316 	if (m3 & (SSKE_MC | SSKE_MR)) {
317 		if (m3 & SSKE_MB) {
318 			/* skey in reg1 is unpredictable */
319 			kvm_s390_set_psw_cc(vcpu, 3);
320 		} else {
321 			kvm_s390_set_psw_cc(vcpu, rc);
322 			vcpu->run->s.regs.gprs[reg1] &= ~0xff00UL;
323 			vcpu->run->s.regs.gprs[reg1] |= (u64) oldkey << 8;
324 		}
325 	}
326 	if (m3 & SSKE_MB) {
327 		if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT)
328 			vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
329 		else
330 			vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
331 		end = kvm_s390_logical_to_effective(vcpu, end);
332 		vcpu->run->s.regs.gprs[reg2] |= end;
333 	}
334 	return 0;
335 }
336 
337 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
338 {
339 	vcpu->stat.instruction_ipte_interlock++;
340 	if (psw_bits(vcpu->arch.sie_block->gpsw).p)
341 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
342 	wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
343 	kvm_s390_retry_instr(vcpu);
344 	VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
345 	return 0;
346 }
347 
348 static int handle_test_block(struct kvm_vcpu *vcpu)
349 {
350 	gpa_t addr;
351 	int reg2;
352 
353 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
354 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
355 
356 	kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
357 	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
358 	addr = kvm_s390_logical_to_effective(vcpu, addr);
359 	if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
360 		return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
361 	addr = kvm_s390_real_to_abs(vcpu, addr);
362 
363 	if (kvm_is_error_gpa(vcpu->kvm, addr))
364 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
365 	/*
366 	 * We don't expect errors on modern systems, and do not care
367 	 * about storage keys (yet), so let's just clear the page.
368 	 */
369 	if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
370 		return -EFAULT;
371 	kvm_s390_set_psw_cc(vcpu, 0);
372 	vcpu->run->s.regs.gprs[0] = 0;
373 	return 0;
374 }
375 
376 static int handle_tpi(struct kvm_vcpu *vcpu)
377 {
378 	struct kvm_s390_interrupt_info *inti;
379 	unsigned long len;
380 	u32 tpi_data[3];
381 	int rc;
382 	u64 addr;
383 	ar_t ar;
384 
385 	addr = kvm_s390_get_base_disp_s(vcpu, &ar);
386 	if (addr & 3)
387 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
388 
389 	inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
390 	if (!inti) {
391 		kvm_s390_set_psw_cc(vcpu, 0);
392 		return 0;
393 	}
394 
395 	tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
396 	tpi_data[1] = inti->io.io_int_parm;
397 	tpi_data[2] = inti->io.io_int_word;
398 	if (addr) {
399 		/*
400 		 * Store the two-word I/O interruption code into the
401 		 * provided area.
402 		 */
403 		len = sizeof(tpi_data) - 4;
404 		rc = write_guest(vcpu, addr, ar, &tpi_data, len);
405 		if (rc) {
406 			rc = kvm_s390_inject_prog_cond(vcpu, rc);
407 			goto reinject_interrupt;
408 		}
409 	} else {
410 		/*
411 		 * Store the three-word I/O interruption code into
412 		 * the appropriate lowcore area.
413 		 */
414 		len = sizeof(tpi_data);
415 		if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
416 			/* failed writes to the low core are not recoverable */
417 			rc = -EFAULT;
418 			goto reinject_interrupt;
419 		}
420 	}
421 
422 	/* irq was successfully handed to the guest */
423 	kfree(inti);
424 	kvm_s390_set_psw_cc(vcpu, 1);
425 	return 0;
426 reinject_interrupt:
427 	/*
428 	 * If we encounter a problem storing the interruption code, the
429 	 * instruction is suppressed from the guest's view: reinject the
430 	 * interrupt.
431 	 */
432 	if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
433 		kfree(inti);
434 		rc = -EFAULT;
435 	}
436 	/* don't set the cc, a pgm irq was injected or we drop to user space */
437 	return rc ? -EFAULT : 0;
438 }
439 
440 static int handle_tsch(struct kvm_vcpu *vcpu)
441 {
442 	struct kvm_s390_interrupt_info *inti = NULL;
443 	const u64 isc_mask = 0xffUL << 24; /* all iscs set */
444 
445 	/* a valid schid has at least one bit set */
446 	if (vcpu->run->s.regs.gprs[1])
447 		inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
448 					   vcpu->run->s.regs.gprs[1]);
449 
450 	/*
451 	 * Prepare exit to userspace.
452 	 * We indicate whether we dequeued a pending I/O interrupt
453 	 * so that userspace can re-inject it if the instruction gets
454 	 * a program check. While this may re-order the pending I/O
455 	 * interrupts, this is no problem since the priority is kept
456 	 * intact.
457 	 */
458 	vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
459 	vcpu->run->s390_tsch.dequeued = !!inti;
460 	if (inti) {
461 		vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
462 		vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
463 		vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
464 		vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
465 	}
466 	vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
467 	kfree(inti);
468 	return -EREMOTE;
469 }
470 
471 static int handle_io_inst(struct kvm_vcpu *vcpu)
472 {
473 	VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
474 
475 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
476 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
477 
478 	if (vcpu->kvm->arch.css_support) {
479 		/*
480 		 * Most I/O instructions will be handled by userspace.
481 		 * Exceptions are tpi and the interrupt portion of tsch.
482 		 */
483 		if (vcpu->arch.sie_block->ipa == 0xb236)
484 			return handle_tpi(vcpu);
485 		if (vcpu->arch.sie_block->ipa == 0xb235)
486 			return handle_tsch(vcpu);
487 		/* Handle in userspace. */
488 		return -EOPNOTSUPP;
489 	} else {
490 		/*
491 		 * Set condition code 3 to stop the guest from issuing channel
492 		 * I/O instructions.
493 		 */
494 		kvm_s390_set_psw_cc(vcpu, 3);
495 		return 0;
496 	}
497 }
498 
499 static int handle_stfl(struct kvm_vcpu *vcpu)
500 {
501 	int rc;
502 	unsigned int fac;
503 
504 	vcpu->stat.instruction_stfl++;
505 
506 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
507 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
508 
509 	/*
510 	 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
511 	 * into a u32 memory representation. They will remain bits 0-31.
512 	 */
513 	fac = *vcpu->kvm->arch.model.fac_list >> 32;
514 	rc = write_guest_lc(vcpu, offsetof(struct lowcore, stfl_fac_list),
515 			    &fac, sizeof(fac));
516 	if (rc)
517 		return rc;
518 	VCPU_EVENT(vcpu, 3, "STFL: store facility list 0x%x", fac);
519 	trace_kvm_s390_handle_stfl(vcpu, fac);
520 	return 0;
521 }
522 
523 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
524 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
525 #define PSW_ADDR_24 0x0000000000ffffffUL
526 #define PSW_ADDR_31 0x000000007fffffffUL
527 
528 int is_valid_psw(psw_t *psw)
529 {
530 	if (psw->mask & PSW_MASK_UNASSIGNED)
531 		return 0;
532 	if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
533 		if (psw->addr & ~PSW_ADDR_31)
534 			return 0;
535 	}
536 	if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
537 		return 0;
538 	if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
539 		return 0;
540 	if (psw->addr & 1)
541 		return 0;
542 	return 1;
543 }
544 
545 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
546 {
547 	psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
548 	psw_compat_t new_psw;
549 	u64 addr;
550 	int rc;
551 	ar_t ar;
552 
553 	if (gpsw->mask & PSW_MASK_PSTATE)
554 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
555 
556 	addr = kvm_s390_get_base_disp_s(vcpu, &ar);
557 	if (addr & 7)
558 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
559 
560 	rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
561 	if (rc)
562 		return kvm_s390_inject_prog_cond(vcpu, rc);
563 	if (!(new_psw.mask & PSW32_MASK_BASE))
564 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
565 	gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
566 	gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
567 	gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
568 	if (!is_valid_psw(gpsw))
569 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
570 	return 0;
571 }
572 
573 static int handle_lpswe(struct kvm_vcpu *vcpu)
574 {
575 	psw_t new_psw;
576 	u64 addr;
577 	int rc;
578 	ar_t ar;
579 
580 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
581 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
582 
583 	addr = kvm_s390_get_base_disp_s(vcpu, &ar);
584 	if (addr & 7)
585 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
586 	rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
587 	if (rc)
588 		return kvm_s390_inject_prog_cond(vcpu, rc);
589 	vcpu->arch.sie_block->gpsw = new_psw;
590 	if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
591 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
592 	return 0;
593 }
594 
595 static int handle_stidp(struct kvm_vcpu *vcpu)
596 {
597 	u64 stidp_data = vcpu->kvm->arch.model.cpuid;
598 	u64 operand2;
599 	int rc;
600 	ar_t ar;
601 
602 	vcpu->stat.instruction_stidp++;
603 
604 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
605 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
606 
607 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
608 
609 	if (operand2 & 7)
610 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
611 
612 	rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
613 	if (rc)
614 		return kvm_s390_inject_prog_cond(vcpu, rc);
615 
616 	VCPU_EVENT(vcpu, 3, "STIDP: store cpu id 0x%llx", stidp_data);
617 	return 0;
618 }
619 
620 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
621 {
622 	int cpus = 0;
623 	int n;
624 
625 	cpus = atomic_read(&vcpu->kvm->online_vcpus);
626 
627 	/* deal with other level 3 hypervisors */
628 	if (stsi(mem, 3, 2, 2))
629 		mem->count = 0;
630 	if (mem->count < 8)
631 		mem->count++;
632 	for (n = mem->count - 1; n > 0 ; n--)
633 		memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
634 
635 	memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
636 	mem->vm[0].cpus_total = cpus;
637 	mem->vm[0].cpus_configured = cpus;
638 	mem->vm[0].cpus_standby = 0;
639 	mem->vm[0].cpus_reserved = 0;
640 	mem->vm[0].caf = 1000;
641 	memcpy(mem->vm[0].name, "KVMguest", 8);
642 	ASCEBC(mem->vm[0].name, 8);
643 	memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
644 	ASCEBC(mem->vm[0].cpi, 16);
645 }
646 
647 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
648 				 u8 fc, u8 sel1, u16 sel2)
649 {
650 	vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
651 	vcpu->run->s390_stsi.addr = addr;
652 	vcpu->run->s390_stsi.ar = ar;
653 	vcpu->run->s390_stsi.fc = fc;
654 	vcpu->run->s390_stsi.sel1 = sel1;
655 	vcpu->run->s390_stsi.sel2 = sel2;
656 }
657 
658 static int handle_stsi(struct kvm_vcpu *vcpu)
659 {
660 	int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
661 	int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
662 	int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
663 	unsigned long mem = 0;
664 	u64 operand2;
665 	int rc = 0;
666 	ar_t ar;
667 
668 	vcpu->stat.instruction_stsi++;
669 	VCPU_EVENT(vcpu, 3, "STSI: fc: %u sel1: %u sel2: %u", fc, sel1, sel2);
670 
671 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
672 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
673 
674 	if (fc > 3) {
675 		kvm_s390_set_psw_cc(vcpu, 3);
676 		return 0;
677 	}
678 
679 	if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
680 	    || vcpu->run->s.regs.gprs[1] & 0xffff0000)
681 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
682 
683 	if (fc == 0) {
684 		vcpu->run->s.regs.gprs[0] = 3 << 28;
685 		kvm_s390_set_psw_cc(vcpu, 0);
686 		return 0;
687 	}
688 
689 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
690 
691 	if (operand2 & 0xfff)
692 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
693 
694 	switch (fc) {
695 	case 1: /* same handling for 1 and 2 */
696 	case 2:
697 		mem = get_zeroed_page(GFP_KERNEL);
698 		if (!mem)
699 			goto out_no_data;
700 		if (stsi((void *) mem, fc, sel1, sel2))
701 			goto out_no_data;
702 		break;
703 	case 3:
704 		if (sel1 != 2 || sel2 != 2)
705 			goto out_no_data;
706 		mem = get_zeroed_page(GFP_KERNEL);
707 		if (!mem)
708 			goto out_no_data;
709 		handle_stsi_3_2_2(vcpu, (void *) mem);
710 		break;
711 	}
712 
713 	rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
714 	if (rc) {
715 		rc = kvm_s390_inject_prog_cond(vcpu, rc);
716 		goto out;
717 	}
718 	if (vcpu->kvm->arch.user_stsi) {
719 		insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
720 		rc = -EREMOTE;
721 	}
722 	trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
723 	free_page(mem);
724 	kvm_s390_set_psw_cc(vcpu, 0);
725 	vcpu->run->s.regs.gprs[0] = 0;
726 	return rc;
727 out_no_data:
728 	kvm_s390_set_psw_cc(vcpu, 3);
729 out:
730 	free_page(mem);
731 	return rc;
732 }
733 
734 static const intercept_handler_t b2_handlers[256] = {
735 	[0x02] = handle_stidp,
736 	[0x04] = handle_set_clock,
737 	[0x10] = handle_set_prefix,
738 	[0x11] = handle_store_prefix,
739 	[0x12] = handle_store_cpu_address,
740 	[0x14] = kvm_s390_handle_vsie,
741 	[0x21] = handle_ipte_interlock,
742 	[0x29] = handle_iske,
743 	[0x2a] = handle_rrbe,
744 	[0x2b] = handle_sske,
745 	[0x2c] = handle_test_block,
746 	[0x30] = handle_io_inst,
747 	[0x31] = handle_io_inst,
748 	[0x32] = handle_io_inst,
749 	[0x33] = handle_io_inst,
750 	[0x34] = handle_io_inst,
751 	[0x35] = handle_io_inst,
752 	[0x36] = handle_io_inst,
753 	[0x37] = handle_io_inst,
754 	[0x38] = handle_io_inst,
755 	[0x39] = handle_io_inst,
756 	[0x3a] = handle_io_inst,
757 	[0x3b] = handle_io_inst,
758 	[0x3c] = handle_io_inst,
759 	[0x50] = handle_ipte_interlock,
760 	[0x5f] = handle_io_inst,
761 	[0x74] = handle_io_inst,
762 	[0x76] = handle_io_inst,
763 	[0x7d] = handle_stsi,
764 	[0xb1] = handle_stfl,
765 	[0xb2] = handle_lpswe,
766 };
767 
768 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
769 {
770 	intercept_handler_t handler;
771 
772 	/*
773 	 * A lot of B2 instructions are priviledged. Here we check for
774 	 * the privileged ones, that we can handle in the kernel.
775 	 * Anything else goes to userspace.
776 	 */
777 	handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
778 	if (handler)
779 		return handler(vcpu);
780 
781 	return -EOPNOTSUPP;
782 }
783 
784 static int handle_epsw(struct kvm_vcpu *vcpu)
785 {
786 	int reg1, reg2;
787 
788 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
789 
790 	/* This basically extracts the mask half of the psw. */
791 	vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
792 	vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
793 	if (reg2) {
794 		vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
795 		vcpu->run->s.regs.gprs[reg2] |=
796 			vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
797 	}
798 	return 0;
799 }
800 
801 #define PFMF_RESERVED   0xfffc0101UL
802 #define PFMF_SK         0x00020000UL
803 #define PFMF_CF         0x00010000UL
804 #define PFMF_UI         0x00008000UL
805 #define PFMF_FSC        0x00007000UL
806 #define PFMF_NQ         0x00000800UL
807 #define PFMF_MR         0x00000400UL
808 #define PFMF_MC         0x00000200UL
809 #define PFMF_KEY        0x000000feUL
810 
811 static int handle_pfmf(struct kvm_vcpu *vcpu)
812 {
813 	bool mr = false, mc = false, nq;
814 	int reg1, reg2;
815 	unsigned long start, end;
816 	unsigned char key;
817 
818 	vcpu->stat.instruction_pfmf++;
819 
820 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
821 
822 	if (!test_kvm_facility(vcpu->kvm, 8))
823 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
824 
825 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
826 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
827 
828 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
829 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
830 
831 	/* Only provide non-quiescing support if enabled for the guest */
832 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ &&
833 	    !test_kvm_facility(vcpu->kvm, 14))
834 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
835 
836 	/* Only provide conditional-SSKE support if enabled for the guest */
837 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK &&
838 	    test_kvm_facility(vcpu->kvm, 10)) {
839 		mr = vcpu->run->s.regs.gprs[reg1] & PFMF_MR;
840 		mc = vcpu->run->s.regs.gprs[reg1] & PFMF_MC;
841 	}
842 
843 	nq = vcpu->run->s.regs.gprs[reg1] & PFMF_NQ;
844 	key = vcpu->run->s.regs.gprs[reg1] & PFMF_KEY;
845 	start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
846 	start = kvm_s390_logical_to_effective(vcpu, start);
847 
848 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
849 		if (kvm_s390_check_low_addr_prot_real(vcpu, start))
850 			return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
851 	}
852 
853 	switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
854 	case 0x00000000:
855 		/* only 4k frames specify a real address */
856 		start = kvm_s390_real_to_abs(vcpu, start);
857 		end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
858 		break;
859 	case 0x00001000:
860 		end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
861 		break;
862 	case 0x00002000:
863 		/* only support 2G frame size if EDAT2 is available and we are
864 		   not in 24-bit addressing mode */
865 		if (!test_kvm_facility(vcpu->kvm, 78) ||
866 		    psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
867 			return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
868 		end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
869 		break;
870 	default:
871 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
872 	}
873 
874 	while (start != end) {
875 		unsigned long useraddr;
876 
877 		/* Translate guest address to host address */
878 		useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
879 		if (kvm_is_error_hva(useraddr))
880 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
881 
882 		if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
883 			if (clear_user((void __user *)useraddr, PAGE_SIZE))
884 				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
885 		}
886 
887 		if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
888 			int rc = __skey_check_enable(vcpu);
889 
890 			if (rc)
891 				return rc;
892 			down_read(&current->mm->mmap_sem);
893 			rc = cond_set_guest_storage_key(current->mm, useraddr,
894 							key, NULL, nq, mr, mc);
895 			up_read(&current->mm->mmap_sem);
896 			if (rc < 0)
897 				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
898 		}
899 
900 		start += PAGE_SIZE;
901 	}
902 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
903 		if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) {
904 			vcpu->run->s.regs.gprs[reg2] = end;
905 		} else {
906 			vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
907 			end = kvm_s390_logical_to_effective(vcpu, end);
908 			vcpu->run->s.regs.gprs[reg2] |= end;
909 		}
910 	}
911 	return 0;
912 }
913 
914 static int handle_essa(struct kvm_vcpu *vcpu)
915 {
916 	/* entries expected to be 1FF */
917 	int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
918 	unsigned long *cbrlo;
919 	struct gmap *gmap;
920 	int i;
921 
922 	VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
923 	gmap = vcpu->arch.gmap;
924 	vcpu->stat.instruction_essa++;
925 	if (!vcpu->kvm->arch.use_cmma)
926 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
927 
928 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
929 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
930 
931 	if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
932 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
933 
934 	/* Retry the ESSA instruction */
935 	kvm_s390_retry_instr(vcpu);
936 	vcpu->arch.sie_block->cbrlo &= PAGE_MASK;	/* reset nceo */
937 	cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
938 	down_read(&gmap->mm->mmap_sem);
939 	for (i = 0; i < entries; ++i)
940 		__gmap_zap(gmap, cbrlo[i]);
941 	up_read(&gmap->mm->mmap_sem);
942 	return 0;
943 }
944 
945 static const intercept_handler_t b9_handlers[256] = {
946 	[0x8a] = handle_ipte_interlock,
947 	[0x8d] = handle_epsw,
948 	[0x8e] = handle_ipte_interlock,
949 	[0x8f] = handle_ipte_interlock,
950 	[0xab] = handle_essa,
951 	[0xaf] = handle_pfmf,
952 };
953 
954 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
955 {
956 	intercept_handler_t handler;
957 
958 	/* This is handled just as for the B2 instructions. */
959 	handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
960 	if (handler)
961 		return handler(vcpu);
962 
963 	return -EOPNOTSUPP;
964 }
965 
966 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
967 {
968 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
969 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
970 	int reg, rc, nr_regs;
971 	u32 ctl_array[16];
972 	u64 ga;
973 	ar_t ar;
974 
975 	vcpu->stat.instruction_lctl++;
976 
977 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
978 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
979 
980 	ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
981 
982 	if (ga & 3)
983 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
984 
985 	VCPU_EVENT(vcpu, 4, "LCTL: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
986 	trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
987 
988 	nr_regs = ((reg3 - reg1) & 0xf) + 1;
989 	rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
990 	if (rc)
991 		return kvm_s390_inject_prog_cond(vcpu, rc);
992 	reg = reg1;
993 	nr_regs = 0;
994 	do {
995 		vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
996 		vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
997 		if (reg == reg3)
998 			break;
999 		reg = (reg + 1) % 16;
1000 	} while (1);
1001 	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1002 	return 0;
1003 }
1004 
1005 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
1006 {
1007 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1008 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1009 	int reg, rc, nr_regs;
1010 	u32 ctl_array[16];
1011 	u64 ga;
1012 	ar_t ar;
1013 
1014 	vcpu->stat.instruction_stctl++;
1015 
1016 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1017 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1018 
1019 	ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
1020 
1021 	if (ga & 3)
1022 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1023 
1024 	VCPU_EVENT(vcpu, 4, "STCTL r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1025 	trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
1026 
1027 	reg = reg1;
1028 	nr_regs = 0;
1029 	do {
1030 		ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1031 		if (reg == reg3)
1032 			break;
1033 		reg = (reg + 1) % 16;
1034 	} while (1);
1035 	rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
1036 	return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1037 }
1038 
1039 static int handle_lctlg(struct kvm_vcpu *vcpu)
1040 {
1041 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1042 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1043 	int reg, rc, nr_regs;
1044 	u64 ctl_array[16];
1045 	u64 ga;
1046 	ar_t ar;
1047 
1048 	vcpu->stat.instruction_lctlg++;
1049 
1050 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1051 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1052 
1053 	ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1054 
1055 	if (ga & 7)
1056 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1057 
1058 	VCPU_EVENT(vcpu, 4, "LCTLG: r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1059 	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
1060 
1061 	nr_regs = ((reg3 - reg1) & 0xf) + 1;
1062 	rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1063 	if (rc)
1064 		return kvm_s390_inject_prog_cond(vcpu, rc);
1065 	reg = reg1;
1066 	nr_regs = 0;
1067 	do {
1068 		vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
1069 		if (reg == reg3)
1070 			break;
1071 		reg = (reg + 1) % 16;
1072 	} while (1);
1073 	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1074 	return 0;
1075 }
1076 
1077 static int handle_stctg(struct kvm_vcpu *vcpu)
1078 {
1079 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
1080 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
1081 	int reg, rc, nr_regs;
1082 	u64 ctl_array[16];
1083 	u64 ga;
1084 	ar_t ar;
1085 
1086 	vcpu->stat.instruction_stctg++;
1087 
1088 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1089 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1090 
1091 	ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
1092 
1093 	if (ga & 7)
1094 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
1095 
1096 	VCPU_EVENT(vcpu, 4, "STCTG r1:%d, r3:%d, addr: 0x%llx", reg1, reg3, ga);
1097 	trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
1098 
1099 	reg = reg1;
1100 	nr_regs = 0;
1101 	do {
1102 		ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
1103 		if (reg == reg3)
1104 			break;
1105 		reg = (reg + 1) % 16;
1106 	} while (1);
1107 	rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
1108 	return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
1109 }
1110 
1111 static const intercept_handler_t eb_handlers[256] = {
1112 	[0x2f] = handle_lctlg,
1113 	[0x25] = handle_stctg,
1114 	[0x60] = handle_ri,
1115 	[0x61] = handle_ri,
1116 	[0x62] = handle_ri,
1117 };
1118 
1119 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
1120 {
1121 	intercept_handler_t handler;
1122 
1123 	handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
1124 	if (handler)
1125 		return handler(vcpu);
1126 	return -EOPNOTSUPP;
1127 }
1128 
1129 static int handle_tprot(struct kvm_vcpu *vcpu)
1130 {
1131 	u64 address1, address2;
1132 	unsigned long hva, gpa;
1133 	int ret = 0, cc = 0;
1134 	bool writable;
1135 	ar_t ar;
1136 
1137 	vcpu->stat.instruction_tprot++;
1138 
1139 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1140 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1141 
1142 	kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
1143 
1144 	/* we only handle the Linux memory detection case:
1145 	 * access key == 0
1146 	 * everything else goes to userspace. */
1147 	if (address2 & 0xf0)
1148 		return -EOPNOTSUPP;
1149 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1150 		ipte_lock(vcpu);
1151 	ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
1152 	if (ret == PGM_PROTECTION) {
1153 		/* Write protected? Try again with read-only... */
1154 		cc = 1;
1155 		ret = guest_translate_address(vcpu, address1, ar, &gpa,
1156 					      GACC_FETCH);
1157 	}
1158 	if (ret) {
1159 		if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1160 			ret = kvm_s390_inject_program_int(vcpu, ret);
1161 		} else if (ret > 0) {
1162 			/* Translation not available */
1163 			kvm_s390_set_psw_cc(vcpu, 3);
1164 			ret = 0;
1165 		}
1166 		goto out_unlock;
1167 	}
1168 
1169 	hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1170 	if (kvm_is_error_hva(hva)) {
1171 		ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1172 	} else {
1173 		if (!writable)
1174 			cc = 1;		/* Write not permitted ==> read-only */
1175 		kvm_s390_set_psw_cc(vcpu, cc);
1176 		/* Note: CC2 only occurs for storage keys (not supported yet) */
1177 	}
1178 out_unlock:
1179 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1180 		ipte_unlock(vcpu);
1181 	return ret;
1182 }
1183 
1184 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1185 {
1186 	/* For e5xx... instructions we only handle TPROT */
1187 	if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1188 		return handle_tprot(vcpu);
1189 	return -EOPNOTSUPP;
1190 }
1191 
1192 static int handle_sckpf(struct kvm_vcpu *vcpu)
1193 {
1194 	u32 value;
1195 
1196 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1197 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1198 
1199 	if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1200 		return kvm_s390_inject_program_int(vcpu,
1201 						   PGM_SPECIFICATION);
1202 
1203 	value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1204 	vcpu->arch.sie_block->todpr = value;
1205 
1206 	return 0;
1207 }
1208 
1209 static int handle_ptff(struct kvm_vcpu *vcpu)
1210 {
1211 	/* we don't emulate any control instructions yet */
1212 	kvm_s390_set_psw_cc(vcpu, 3);
1213 	return 0;
1214 }
1215 
1216 static const intercept_handler_t x01_handlers[256] = {
1217 	[0x04] = handle_ptff,
1218 	[0x07] = handle_sckpf,
1219 };
1220 
1221 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1222 {
1223 	intercept_handler_t handler;
1224 
1225 	handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1226 	if (handler)
1227 		return handler(vcpu);
1228 	return -EOPNOTSUPP;
1229 }
1230