xref: /openbmc/linux/arch/s390/kvm/priv.c (revision e2f1cf25)
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 	struct kvm_vcpu *cpup;
37 	s64 hostclk, val;
38 	int i, rc;
39 	ar_t ar;
40 	u64 op2;
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 	if (store_tod_clock(&hostclk)) {
53 		kvm_s390_set_psw_cc(vcpu, 3);
54 		return 0;
55 	}
56 	val = (val - hostclk) & ~0x3fUL;
57 
58 	mutex_lock(&vcpu->kvm->lock);
59 	kvm_for_each_vcpu(i, cpup, vcpu->kvm)
60 		cpup->arch.sie_block->epoch = val;
61 	mutex_unlock(&vcpu->kvm->lock);
62 
63 	kvm_s390_set_psw_cc(vcpu, 0);
64 	return 0;
65 }
66 
67 static int handle_set_prefix(struct kvm_vcpu *vcpu)
68 {
69 	u64 operand2;
70 	u32 address;
71 	int rc;
72 	ar_t ar;
73 
74 	vcpu->stat.instruction_spx++;
75 
76 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
77 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
78 
79 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
80 
81 	/* must be word boundary */
82 	if (operand2 & 3)
83 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
84 
85 	/* get the value */
86 	rc = read_guest(vcpu, operand2, ar, &address, sizeof(address));
87 	if (rc)
88 		return kvm_s390_inject_prog_cond(vcpu, rc);
89 
90 	address &= 0x7fffe000u;
91 
92 	/*
93 	 * Make sure the new value is valid memory. We only need to check the
94 	 * first page, since address is 8k aligned and memory pieces are always
95 	 * at least 1MB aligned and have at least a size of 1MB.
96 	 */
97 	if (kvm_is_error_gpa(vcpu->kvm, address))
98 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
99 
100 	kvm_s390_set_prefix(vcpu, address);
101 
102 	VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
103 	trace_kvm_s390_handle_prefix(vcpu, 1, address);
104 	return 0;
105 }
106 
107 static int handle_store_prefix(struct kvm_vcpu *vcpu)
108 {
109 	u64 operand2;
110 	u32 address;
111 	int rc;
112 	ar_t ar;
113 
114 	vcpu->stat.instruction_stpx++;
115 
116 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
117 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
118 
119 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
120 
121 	/* must be word boundary */
122 	if (operand2 & 3)
123 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
124 
125 	address = kvm_s390_get_prefix(vcpu);
126 
127 	/* get the value */
128 	rc = write_guest(vcpu, operand2, ar, &address, sizeof(address));
129 	if (rc)
130 		return kvm_s390_inject_prog_cond(vcpu, rc);
131 
132 	VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
133 	trace_kvm_s390_handle_prefix(vcpu, 0, address);
134 	return 0;
135 }
136 
137 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
138 {
139 	u16 vcpu_id = vcpu->vcpu_id;
140 	u64 ga;
141 	int rc;
142 	ar_t ar;
143 
144 	vcpu->stat.instruction_stap++;
145 
146 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
147 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
148 
149 	ga = kvm_s390_get_base_disp_s(vcpu, &ar);
150 
151 	if (ga & 1)
152 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
153 
154 	rc = write_guest(vcpu, ga, ar, &vcpu_id, sizeof(vcpu_id));
155 	if (rc)
156 		return kvm_s390_inject_prog_cond(vcpu, rc);
157 
158 	VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", ga);
159 	trace_kvm_s390_handle_stap(vcpu, ga);
160 	return 0;
161 }
162 
163 static int __skey_check_enable(struct kvm_vcpu *vcpu)
164 {
165 	int rc = 0;
166 	if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
167 		return rc;
168 
169 	rc = s390_enable_skey();
170 	trace_kvm_s390_skey_related_inst(vcpu);
171 	vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
172 	return rc;
173 }
174 
175 
176 static int handle_skey(struct kvm_vcpu *vcpu)
177 {
178 	int rc = __skey_check_enable(vcpu);
179 
180 	if (rc)
181 		return rc;
182 	vcpu->stat.instruction_storage_key++;
183 
184 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
185 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
186 
187 	kvm_s390_rewind_psw(vcpu, 4);
188 	VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
189 	return 0;
190 }
191 
192 static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
193 {
194 	vcpu->stat.instruction_ipte_interlock++;
195 	if (psw_bits(vcpu->arch.sie_block->gpsw).p)
196 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
197 	wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
198 	kvm_s390_rewind_psw(vcpu, 4);
199 	VCPU_EVENT(vcpu, 4, "%s", "retrying ipte interlock operation");
200 	return 0;
201 }
202 
203 static int handle_test_block(struct kvm_vcpu *vcpu)
204 {
205 	gpa_t addr;
206 	int reg2;
207 
208 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
209 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
210 
211 	kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
212 	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
213 	addr = kvm_s390_logical_to_effective(vcpu, addr);
214 	if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
215 		return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
216 	addr = kvm_s390_real_to_abs(vcpu, addr);
217 
218 	if (kvm_is_error_gpa(vcpu->kvm, addr))
219 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
220 	/*
221 	 * We don't expect errors on modern systems, and do not care
222 	 * about storage keys (yet), so let's just clear the page.
223 	 */
224 	if (kvm_clear_guest(vcpu->kvm, addr, PAGE_SIZE))
225 		return -EFAULT;
226 	kvm_s390_set_psw_cc(vcpu, 0);
227 	vcpu->run->s.regs.gprs[0] = 0;
228 	return 0;
229 }
230 
231 static int handle_tpi(struct kvm_vcpu *vcpu)
232 {
233 	struct kvm_s390_interrupt_info *inti;
234 	unsigned long len;
235 	u32 tpi_data[3];
236 	int rc;
237 	u64 addr;
238 	ar_t ar;
239 
240 	addr = kvm_s390_get_base_disp_s(vcpu, &ar);
241 	if (addr & 3)
242 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
243 
244 	inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
245 	if (!inti) {
246 		kvm_s390_set_psw_cc(vcpu, 0);
247 		return 0;
248 	}
249 
250 	tpi_data[0] = inti->io.subchannel_id << 16 | inti->io.subchannel_nr;
251 	tpi_data[1] = inti->io.io_int_parm;
252 	tpi_data[2] = inti->io.io_int_word;
253 	if (addr) {
254 		/*
255 		 * Store the two-word I/O interruption code into the
256 		 * provided area.
257 		 */
258 		len = sizeof(tpi_data) - 4;
259 		rc = write_guest(vcpu, addr, ar, &tpi_data, len);
260 		if (rc) {
261 			rc = kvm_s390_inject_prog_cond(vcpu, rc);
262 			goto reinject_interrupt;
263 		}
264 	} else {
265 		/*
266 		 * Store the three-word I/O interruption code into
267 		 * the appropriate lowcore area.
268 		 */
269 		len = sizeof(tpi_data);
270 		if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len)) {
271 			/* failed writes to the low core are not recoverable */
272 			rc = -EFAULT;
273 			goto reinject_interrupt;
274 		}
275 	}
276 
277 	/* irq was successfully handed to the guest */
278 	kfree(inti);
279 	kvm_s390_set_psw_cc(vcpu, 1);
280 	return 0;
281 reinject_interrupt:
282 	/*
283 	 * If we encounter a problem storing the interruption code, the
284 	 * instruction is suppressed from the guest's view: reinject the
285 	 * interrupt.
286 	 */
287 	if (kvm_s390_reinject_io_int(vcpu->kvm, inti)) {
288 		kfree(inti);
289 		rc = -EFAULT;
290 	}
291 	/* don't set the cc, a pgm irq was injected or we drop to user space */
292 	return rc ? -EFAULT : 0;
293 }
294 
295 static int handle_tsch(struct kvm_vcpu *vcpu)
296 {
297 	struct kvm_s390_interrupt_info *inti = NULL;
298 	const u64 isc_mask = 0xffUL << 24; /* all iscs set */
299 
300 	/* a valid schid has at least one bit set */
301 	if (vcpu->run->s.regs.gprs[1])
302 		inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
303 					   vcpu->run->s.regs.gprs[1]);
304 
305 	/*
306 	 * Prepare exit to userspace.
307 	 * We indicate whether we dequeued a pending I/O interrupt
308 	 * so that userspace can re-inject it if the instruction gets
309 	 * a program check. While this may re-order the pending I/O
310 	 * interrupts, this is no problem since the priority is kept
311 	 * intact.
312 	 */
313 	vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
314 	vcpu->run->s390_tsch.dequeued = !!inti;
315 	if (inti) {
316 		vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
317 		vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
318 		vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
319 		vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
320 	}
321 	vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
322 	kfree(inti);
323 	return -EREMOTE;
324 }
325 
326 static int handle_io_inst(struct kvm_vcpu *vcpu)
327 {
328 	VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
329 
330 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
331 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
332 
333 	if (vcpu->kvm->arch.css_support) {
334 		/*
335 		 * Most I/O instructions will be handled by userspace.
336 		 * Exceptions are tpi and the interrupt portion of tsch.
337 		 */
338 		if (vcpu->arch.sie_block->ipa == 0xb236)
339 			return handle_tpi(vcpu);
340 		if (vcpu->arch.sie_block->ipa == 0xb235)
341 			return handle_tsch(vcpu);
342 		/* Handle in userspace. */
343 		return -EOPNOTSUPP;
344 	} else {
345 		/*
346 		 * Set condition code 3 to stop the guest from issuing channel
347 		 * I/O instructions.
348 		 */
349 		kvm_s390_set_psw_cc(vcpu, 3);
350 		return 0;
351 	}
352 }
353 
354 static int handle_stfl(struct kvm_vcpu *vcpu)
355 {
356 	int rc;
357 	unsigned int fac;
358 
359 	vcpu->stat.instruction_stfl++;
360 
361 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
362 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
363 
364 	/*
365 	 * We need to shift the lower 32 facility bits (bit 0-31) from a u64
366 	 * into a u32 memory representation. They will remain bits 0-31.
367 	 */
368 	fac = *vcpu->kvm->arch.model.fac->list >> 32;
369 	rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
370 			    &fac, sizeof(fac));
371 	if (rc)
372 		return rc;
373 	VCPU_EVENT(vcpu, 5, "store facility list value %x", fac);
374 	trace_kvm_s390_handle_stfl(vcpu, fac);
375 	return 0;
376 }
377 
378 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
379 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
380 #define PSW_ADDR_24 0x0000000000ffffffUL
381 #define PSW_ADDR_31 0x000000007fffffffUL
382 
383 int is_valid_psw(psw_t *psw)
384 {
385 	if (psw->mask & PSW_MASK_UNASSIGNED)
386 		return 0;
387 	if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
388 		if (psw->addr & ~PSW_ADDR_31)
389 			return 0;
390 	}
391 	if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
392 		return 0;
393 	if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
394 		return 0;
395 	if (psw->addr & 1)
396 		return 0;
397 	return 1;
398 }
399 
400 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
401 {
402 	psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
403 	psw_compat_t new_psw;
404 	u64 addr;
405 	int rc;
406 	ar_t ar;
407 
408 	if (gpsw->mask & PSW_MASK_PSTATE)
409 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
410 
411 	addr = kvm_s390_get_base_disp_s(vcpu, &ar);
412 	if (addr & 7)
413 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
414 
415 	rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
416 	if (rc)
417 		return kvm_s390_inject_prog_cond(vcpu, rc);
418 	if (!(new_psw.mask & PSW32_MASK_BASE))
419 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
420 	gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
421 	gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
422 	gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
423 	if (!is_valid_psw(gpsw))
424 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
425 	return 0;
426 }
427 
428 static int handle_lpswe(struct kvm_vcpu *vcpu)
429 {
430 	psw_t new_psw;
431 	u64 addr;
432 	int rc;
433 	ar_t ar;
434 
435 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
436 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
437 
438 	addr = kvm_s390_get_base_disp_s(vcpu, &ar);
439 	if (addr & 7)
440 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
441 	rc = read_guest(vcpu, addr, ar, &new_psw, sizeof(new_psw));
442 	if (rc)
443 		return kvm_s390_inject_prog_cond(vcpu, rc);
444 	vcpu->arch.sie_block->gpsw = new_psw;
445 	if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
446 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
447 	return 0;
448 }
449 
450 static int handle_stidp(struct kvm_vcpu *vcpu)
451 {
452 	u64 stidp_data = vcpu->arch.stidp_data;
453 	u64 operand2;
454 	int rc;
455 	ar_t ar;
456 
457 	vcpu->stat.instruction_stidp++;
458 
459 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
460 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
461 
462 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
463 
464 	if (operand2 & 7)
465 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
466 
467 	rc = write_guest(vcpu, operand2, ar, &stidp_data, sizeof(stidp_data));
468 	if (rc)
469 		return kvm_s390_inject_prog_cond(vcpu, rc);
470 
471 	VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
472 	return 0;
473 }
474 
475 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
476 {
477 	int cpus = 0;
478 	int n;
479 
480 	cpus = atomic_read(&vcpu->kvm->online_vcpus);
481 
482 	/* deal with other level 3 hypervisors */
483 	if (stsi(mem, 3, 2, 2))
484 		mem->count = 0;
485 	if (mem->count < 8)
486 		mem->count++;
487 	for (n = mem->count - 1; n > 0 ; n--)
488 		memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
489 
490 	memset(&mem->vm[0], 0, sizeof(mem->vm[0]));
491 	mem->vm[0].cpus_total = cpus;
492 	mem->vm[0].cpus_configured = cpus;
493 	mem->vm[0].cpus_standby = 0;
494 	mem->vm[0].cpus_reserved = 0;
495 	mem->vm[0].caf = 1000;
496 	memcpy(mem->vm[0].name, "KVMguest", 8);
497 	ASCEBC(mem->vm[0].name, 8);
498 	memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
499 	ASCEBC(mem->vm[0].cpi, 16);
500 }
501 
502 static void insert_stsi_usr_data(struct kvm_vcpu *vcpu, u64 addr, ar_t ar,
503 				 u8 fc, u8 sel1, u16 sel2)
504 {
505 	vcpu->run->exit_reason = KVM_EXIT_S390_STSI;
506 	vcpu->run->s390_stsi.addr = addr;
507 	vcpu->run->s390_stsi.ar = ar;
508 	vcpu->run->s390_stsi.fc = fc;
509 	vcpu->run->s390_stsi.sel1 = sel1;
510 	vcpu->run->s390_stsi.sel2 = sel2;
511 }
512 
513 static int handle_stsi(struct kvm_vcpu *vcpu)
514 {
515 	int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
516 	int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
517 	int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
518 	unsigned long mem = 0;
519 	u64 operand2;
520 	int rc = 0;
521 	ar_t ar;
522 
523 	vcpu->stat.instruction_stsi++;
524 	VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
525 
526 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
527 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
528 
529 	if (fc > 3) {
530 		kvm_s390_set_psw_cc(vcpu, 3);
531 		return 0;
532 	}
533 
534 	if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
535 	    || vcpu->run->s.regs.gprs[1] & 0xffff0000)
536 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
537 
538 	if (fc == 0) {
539 		vcpu->run->s.regs.gprs[0] = 3 << 28;
540 		kvm_s390_set_psw_cc(vcpu, 0);
541 		return 0;
542 	}
543 
544 	operand2 = kvm_s390_get_base_disp_s(vcpu, &ar);
545 
546 	if (operand2 & 0xfff)
547 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
548 
549 	switch (fc) {
550 	case 1: /* same handling for 1 and 2 */
551 	case 2:
552 		mem = get_zeroed_page(GFP_KERNEL);
553 		if (!mem)
554 			goto out_no_data;
555 		if (stsi((void *) mem, fc, sel1, sel2))
556 			goto out_no_data;
557 		break;
558 	case 3:
559 		if (sel1 != 2 || sel2 != 2)
560 			goto out_no_data;
561 		mem = get_zeroed_page(GFP_KERNEL);
562 		if (!mem)
563 			goto out_no_data;
564 		handle_stsi_3_2_2(vcpu, (void *) mem);
565 		break;
566 	}
567 
568 	rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE);
569 	if (rc) {
570 		rc = kvm_s390_inject_prog_cond(vcpu, rc);
571 		goto out;
572 	}
573 	if (vcpu->kvm->arch.user_stsi) {
574 		insert_stsi_usr_data(vcpu, operand2, ar, fc, sel1, sel2);
575 		rc = -EREMOTE;
576 	}
577 	trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
578 	free_page(mem);
579 	kvm_s390_set_psw_cc(vcpu, 0);
580 	vcpu->run->s.regs.gprs[0] = 0;
581 	return rc;
582 out_no_data:
583 	kvm_s390_set_psw_cc(vcpu, 3);
584 out:
585 	free_page(mem);
586 	return rc;
587 }
588 
589 static const intercept_handler_t b2_handlers[256] = {
590 	[0x02] = handle_stidp,
591 	[0x04] = handle_set_clock,
592 	[0x10] = handle_set_prefix,
593 	[0x11] = handle_store_prefix,
594 	[0x12] = handle_store_cpu_address,
595 	[0x21] = handle_ipte_interlock,
596 	[0x29] = handle_skey,
597 	[0x2a] = handle_skey,
598 	[0x2b] = handle_skey,
599 	[0x2c] = handle_test_block,
600 	[0x30] = handle_io_inst,
601 	[0x31] = handle_io_inst,
602 	[0x32] = handle_io_inst,
603 	[0x33] = handle_io_inst,
604 	[0x34] = handle_io_inst,
605 	[0x35] = handle_io_inst,
606 	[0x36] = handle_io_inst,
607 	[0x37] = handle_io_inst,
608 	[0x38] = handle_io_inst,
609 	[0x39] = handle_io_inst,
610 	[0x3a] = handle_io_inst,
611 	[0x3b] = handle_io_inst,
612 	[0x3c] = handle_io_inst,
613 	[0x50] = handle_ipte_interlock,
614 	[0x5f] = handle_io_inst,
615 	[0x74] = handle_io_inst,
616 	[0x76] = handle_io_inst,
617 	[0x7d] = handle_stsi,
618 	[0xb1] = handle_stfl,
619 	[0xb2] = handle_lpswe,
620 };
621 
622 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
623 {
624 	intercept_handler_t handler;
625 
626 	/*
627 	 * A lot of B2 instructions are priviledged. Here we check for
628 	 * the privileged ones, that we can handle in the kernel.
629 	 * Anything else goes to userspace.
630 	 */
631 	handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
632 	if (handler)
633 		return handler(vcpu);
634 
635 	return -EOPNOTSUPP;
636 }
637 
638 static int handle_epsw(struct kvm_vcpu *vcpu)
639 {
640 	int reg1, reg2;
641 
642 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
643 
644 	/* This basically extracts the mask half of the psw. */
645 	vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
646 	vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
647 	if (reg2) {
648 		vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
649 		vcpu->run->s.regs.gprs[reg2] |=
650 			vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
651 	}
652 	return 0;
653 }
654 
655 #define PFMF_RESERVED   0xfffc0101UL
656 #define PFMF_SK         0x00020000UL
657 #define PFMF_CF         0x00010000UL
658 #define PFMF_UI         0x00008000UL
659 #define PFMF_FSC        0x00007000UL
660 #define PFMF_NQ         0x00000800UL
661 #define PFMF_MR         0x00000400UL
662 #define PFMF_MC         0x00000200UL
663 #define PFMF_KEY        0x000000feUL
664 
665 static int handle_pfmf(struct kvm_vcpu *vcpu)
666 {
667 	int reg1, reg2;
668 	unsigned long start, end;
669 
670 	vcpu->stat.instruction_pfmf++;
671 
672 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
673 
674 	if (!MACHINE_HAS_PFMF)
675 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
676 
677 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
678 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
679 
680 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
681 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
682 
683 	/* Only provide non-quiescing support if the host supports it */
684 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
685 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
686 
687 	/* No support for conditional-SSKE */
688 	if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
689 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
690 
691 	start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
692 	start = kvm_s390_logical_to_effective(vcpu, start);
693 
694 	switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
695 	case 0x00000000:
696 		end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
697 		break;
698 	case 0x00001000:
699 		end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
700 		break;
701 	case 0x00002000:
702 		/* only support 2G frame size if EDAT2 is available and we are
703 		   not in 24-bit addressing mode */
704 		if (!test_kvm_facility(vcpu->kvm, 78) ||
705 		    psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
706 			return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
707 		end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
708 		break;
709 	default:
710 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
711 	}
712 
713 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
714 		if (kvm_s390_check_low_addr_prot_real(vcpu, start))
715 			return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
716 	}
717 
718 	while (start < end) {
719 		unsigned long useraddr, abs_addr;
720 
721 		/* Translate guest address to host address */
722 		if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
723 			abs_addr = kvm_s390_real_to_abs(vcpu, start);
724 		else
725 			abs_addr = start;
726 		useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
727 		if (kvm_is_error_hva(useraddr))
728 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
729 
730 		if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
731 			if (clear_user((void __user *)useraddr, PAGE_SIZE))
732 				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
733 		}
734 
735 		if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
736 			int rc = __skey_check_enable(vcpu);
737 
738 			if (rc)
739 				return rc;
740 			if (set_guest_storage_key(current->mm, useraddr,
741 					vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
742 					vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
743 				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
744 		}
745 
746 		start += PAGE_SIZE;
747 	}
748 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
749 		vcpu->run->s.regs.gprs[reg2] = end;
750 	return 0;
751 }
752 
753 static int handle_essa(struct kvm_vcpu *vcpu)
754 {
755 	/* entries expected to be 1FF */
756 	int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
757 	unsigned long *cbrlo, cbrle;
758 	struct gmap *gmap;
759 	int i;
760 
761 	VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
762 	gmap = vcpu->arch.gmap;
763 	vcpu->stat.instruction_essa++;
764 	if (!kvm_s390_cmma_enabled(vcpu->kvm))
765 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
766 
767 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
768 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
769 
770 	if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
771 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
772 
773 	/* Rewind PSW to repeat the ESSA instruction */
774 	kvm_s390_rewind_psw(vcpu, 4);
775 	vcpu->arch.sie_block->cbrlo &= PAGE_MASK;	/* reset nceo */
776 	cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
777 	down_read(&gmap->mm->mmap_sem);
778 	for (i = 0; i < entries; ++i) {
779 		cbrle = cbrlo[i];
780 		if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
781 			/* invalid entry */
782 			break;
783 		/* try to free backing */
784 		__gmap_zap(gmap, cbrle);
785 	}
786 	up_read(&gmap->mm->mmap_sem);
787 	if (i < entries)
788 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
789 	return 0;
790 }
791 
792 static const intercept_handler_t b9_handlers[256] = {
793 	[0x8a] = handle_ipte_interlock,
794 	[0x8d] = handle_epsw,
795 	[0x8e] = handle_ipte_interlock,
796 	[0x8f] = handle_ipte_interlock,
797 	[0xab] = handle_essa,
798 	[0xaf] = handle_pfmf,
799 };
800 
801 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
802 {
803 	intercept_handler_t handler;
804 
805 	/* This is handled just as for the B2 instructions. */
806 	handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
807 	if (handler)
808 		return handler(vcpu);
809 
810 	return -EOPNOTSUPP;
811 }
812 
813 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
814 {
815 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
816 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
817 	int reg, rc, nr_regs;
818 	u32 ctl_array[16];
819 	u64 ga;
820 	ar_t ar;
821 
822 	vcpu->stat.instruction_lctl++;
823 
824 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
825 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
826 
827 	ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
828 
829 	if (ga & 3)
830 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
831 
832 	VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
833 	trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, ga);
834 
835 	nr_regs = ((reg3 - reg1) & 0xf) + 1;
836 	rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
837 	if (rc)
838 		return kvm_s390_inject_prog_cond(vcpu, rc);
839 	reg = reg1;
840 	nr_regs = 0;
841 	do {
842 		vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
843 		vcpu->arch.sie_block->gcr[reg] |= ctl_array[nr_regs++];
844 		if (reg == reg3)
845 			break;
846 		reg = (reg + 1) % 16;
847 	} while (1);
848 	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
849 	return 0;
850 }
851 
852 int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu)
853 {
854 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
855 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
856 	int reg, rc, nr_regs;
857 	u32 ctl_array[16];
858 	u64 ga;
859 	ar_t ar;
860 
861 	vcpu->stat.instruction_stctl++;
862 
863 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
864 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
865 
866 	ga = kvm_s390_get_base_disp_rs(vcpu, &ar);
867 
868 	if (ga & 3)
869 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
870 
871 	VCPU_EVENT(vcpu, 5, "stctl r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
872 	trace_kvm_s390_handle_stctl(vcpu, 0, reg1, reg3, ga);
873 
874 	reg = reg1;
875 	nr_regs = 0;
876 	do {
877 		ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
878 		if (reg == reg3)
879 			break;
880 		reg = (reg + 1) % 16;
881 	} while (1);
882 	rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u32));
883 	return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
884 }
885 
886 static int handle_lctlg(struct kvm_vcpu *vcpu)
887 {
888 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
889 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
890 	int reg, rc, nr_regs;
891 	u64 ctl_array[16];
892 	u64 ga;
893 	ar_t ar;
894 
895 	vcpu->stat.instruction_lctlg++;
896 
897 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
898 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
899 
900 	ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
901 
902 	if (ga & 7)
903 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
904 
905 	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
906 	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, ga);
907 
908 	nr_regs = ((reg3 - reg1) & 0xf) + 1;
909 	rc = read_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
910 	if (rc)
911 		return kvm_s390_inject_prog_cond(vcpu, rc);
912 	reg = reg1;
913 	nr_regs = 0;
914 	do {
915 		vcpu->arch.sie_block->gcr[reg] = ctl_array[nr_regs++];
916 		if (reg == reg3)
917 			break;
918 		reg = (reg + 1) % 16;
919 	} while (1);
920 	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
921 	return 0;
922 }
923 
924 static int handle_stctg(struct kvm_vcpu *vcpu)
925 {
926 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
927 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
928 	int reg, rc, nr_regs;
929 	u64 ctl_array[16];
930 	u64 ga;
931 	ar_t ar;
932 
933 	vcpu->stat.instruction_stctg++;
934 
935 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
936 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
937 
938 	ga = kvm_s390_get_base_disp_rsy(vcpu, &ar);
939 
940 	if (ga & 7)
941 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
942 
943 	VCPU_EVENT(vcpu, 5, "stctg r1:%x, r3:%x, addr:%llx", reg1, reg3, ga);
944 	trace_kvm_s390_handle_stctl(vcpu, 1, reg1, reg3, ga);
945 
946 	reg = reg1;
947 	nr_regs = 0;
948 	do {
949 		ctl_array[nr_regs++] = vcpu->arch.sie_block->gcr[reg];
950 		if (reg == reg3)
951 			break;
952 		reg = (reg + 1) % 16;
953 	} while (1);
954 	rc = write_guest(vcpu, ga, ar, ctl_array, nr_regs * sizeof(u64));
955 	return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
956 }
957 
958 static const intercept_handler_t eb_handlers[256] = {
959 	[0x2f] = handle_lctlg,
960 	[0x25] = handle_stctg,
961 };
962 
963 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
964 {
965 	intercept_handler_t handler;
966 
967 	handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
968 	if (handler)
969 		return handler(vcpu);
970 	return -EOPNOTSUPP;
971 }
972 
973 static int handle_tprot(struct kvm_vcpu *vcpu)
974 {
975 	u64 address1, address2;
976 	unsigned long hva, gpa;
977 	int ret = 0, cc = 0;
978 	bool writable;
979 	ar_t ar;
980 
981 	vcpu->stat.instruction_tprot++;
982 
983 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
984 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
985 
986 	kvm_s390_get_base_disp_sse(vcpu, &address1, &address2, &ar, NULL);
987 
988 	/* we only handle the Linux memory detection case:
989 	 * access key == 0
990 	 * everything else goes to userspace. */
991 	if (address2 & 0xf0)
992 		return -EOPNOTSUPP;
993 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
994 		ipte_lock(vcpu);
995 	ret = guest_translate_address(vcpu, address1, ar, &gpa, 1);
996 	if (ret == PGM_PROTECTION) {
997 		/* Write protected? Try again with read-only... */
998 		cc = 1;
999 		ret = guest_translate_address(vcpu, address1, ar, &gpa, 0);
1000 	}
1001 	if (ret) {
1002 		if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {
1003 			ret = kvm_s390_inject_program_int(vcpu, ret);
1004 		} else if (ret > 0) {
1005 			/* Translation not available */
1006 			kvm_s390_set_psw_cc(vcpu, 3);
1007 			ret = 0;
1008 		}
1009 		goto out_unlock;
1010 	}
1011 
1012 	hva = gfn_to_hva_prot(vcpu->kvm, gpa_to_gfn(gpa), &writable);
1013 	if (kvm_is_error_hva(hva)) {
1014 		ret = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1015 	} else {
1016 		if (!writable)
1017 			cc = 1;		/* Write not permitted ==> read-only */
1018 		kvm_s390_set_psw_cc(vcpu, cc);
1019 		/* Note: CC2 only occurs for storage keys (not supported yet) */
1020 	}
1021 out_unlock:
1022 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
1023 		ipte_unlock(vcpu);
1024 	return ret;
1025 }
1026 
1027 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
1028 {
1029 	/* For e5xx... instructions we only handle TPROT */
1030 	if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
1031 		return handle_tprot(vcpu);
1032 	return -EOPNOTSUPP;
1033 }
1034 
1035 static int handle_sckpf(struct kvm_vcpu *vcpu)
1036 {
1037 	u32 value;
1038 
1039 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
1040 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
1041 
1042 	if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
1043 		return kvm_s390_inject_program_int(vcpu,
1044 						   PGM_SPECIFICATION);
1045 
1046 	value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
1047 	vcpu->arch.sie_block->todpr = value;
1048 
1049 	return 0;
1050 }
1051 
1052 static const intercept_handler_t x01_handlers[256] = {
1053 	[0x07] = handle_sckpf,
1054 };
1055 
1056 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
1057 {
1058 	intercept_handler_t handler;
1059 
1060 	handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
1061 	if (handler)
1062 		return handler(vcpu);
1063 	return -EOPNOTSUPP;
1064 }
1065