xref: /openbmc/linux/arch/s390/kvm/priv.c (revision b34e08d5)
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 	u64 op2;
39 	int i;
40 
41 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
42 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
43 
44 	op2 = kvm_s390_get_base_disp_s(vcpu);
45 	if (op2 & 7)	/* Operand must be on a doubleword boundary */
46 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
47 	if (get_guest(vcpu, val, (u64 __user *) op2))
48 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
49 
50 	if (store_tod_clock(&hostclk)) {
51 		kvm_s390_set_psw_cc(vcpu, 3);
52 		return 0;
53 	}
54 	val = (val - hostclk) & ~0x3fUL;
55 
56 	mutex_lock(&vcpu->kvm->lock);
57 	kvm_for_each_vcpu(i, cpup, vcpu->kvm)
58 		cpup->arch.sie_block->epoch = val;
59 	mutex_unlock(&vcpu->kvm->lock);
60 
61 	kvm_s390_set_psw_cc(vcpu, 0);
62 	return 0;
63 }
64 
65 static int handle_set_prefix(struct kvm_vcpu *vcpu)
66 {
67 	u64 operand2;
68 	u32 address = 0;
69 	u8 tmp;
70 
71 	vcpu->stat.instruction_spx++;
72 
73 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
74 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
75 
76 	operand2 = kvm_s390_get_base_disp_s(vcpu);
77 
78 	/* must be word boundary */
79 	if (operand2 & 3)
80 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
81 
82 	/* get the value */
83 	if (get_guest(vcpu, address, (u32 __user *) operand2))
84 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
85 
86 	address = address & 0x7fffe000u;
87 
88 	/* make sure that the new value is valid memory */
89 	if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
90 	   (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
91 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
92 
93 	kvm_s390_set_prefix(vcpu, address);
94 
95 	VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
96 	trace_kvm_s390_handle_prefix(vcpu, 1, address);
97 	return 0;
98 }
99 
100 static int handle_store_prefix(struct kvm_vcpu *vcpu)
101 {
102 	u64 operand2;
103 	u32 address;
104 
105 	vcpu->stat.instruction_stpx++;
106 
107 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
108 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
109 
110 	operand2 = kvm_s390_get_base_disp_s(vcpu);
111 
112 	/* must be word boundary */
113 	if (operand2 & 3)
114 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
115 
116 	address = vcpu->arch.sie_block->prefix;
117 	address = address & 0x7fffe000u;
118 
119 	/* get the value */
120 	if (put_guest(vcpu, address, (u32 __user *)operand2))
121 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
122 
123 	VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
124 	trace_kvm_s390_handle_prefix(vcpu, 0, address);
125 	return 0;
126 }
127 
128 static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
129 {
130 	u64 useraddr;
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 	useraddr = kvm_s390_get_base_disp_s(vcpu);
138 
139 	if (useraddr & 1)
140 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
141 
142 	if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr))
143 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
144 
145 	VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
146 	trace_kvm_s390_handle_stap(vcpu, useraddr);
147 	return 0;
148 }
149 
150 static int handle_skey(struct kvm_vcpu *vcpu)
151 {
152 	vcpu->stat.instruction_storage_key++;
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 	vcpu->arch.sie_block->gpsw.addr =
158 		__rewind_psw(vcpu->arch.sie_block->gpsw, 4);
159 	VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
160 	return 0;
161 }
162 
163 static int handle_test_block(struct kvm_vcpu *vcpu)
164 {
165 	unsigned long hva;
166 	gpa_t addr;
167 	int reg2;
168 
169 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
170 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
171 
172 	kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
173 	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
174 	addr = kvm_s390_real_to_abs(vcpu, addr);
175 
176 	hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
177 	if (kvm_is_error_hva(hva))
178 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
179 	/*
180 	 * We don't expect errors on modern systems, and do not care
181 	 * about storage keys (yet), so let's just clear the page.
182 	 */
183 	if (clear_user((void __user *)hva, PAGE_SIZE) != 0)
184 		return -EFAULT;
185 	kvm_s390_set_psw_cc(vcpu, 0);
186 	vcpu->run->s.regs.gprs[0] = 0;
187 	return 0;
188 }
189 
190 static int handle_tpi(struct kvm_vcpu *vcpu)
191 {
192 	struct kvm_s390_interrupt_info *inti;
193 	u64 addr;
194 	int cc;
195 
196 	addr = kvm_s390_get_base_disp_s(vcpu);
197 	if (addr & 3)
198 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
199 	cc = 0;
200 	inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->arch.sie_block->gcr[6], 0);
201 	if (!inti)
202 		goto no_interrupt;
203 	cc = 1;
204 	if (addr) {
205 		/*
206 		 * Store the two-word I/O interruption code into the
207 		 * provided area.
208 		 */
209 		if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr)
210 		    || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2))
211 		    || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4)))
212 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
213 	} else {
214 		/*
215 		 * Store the three-word I/O interruption code into
216 		 * the appropriate lowcore area.
217 		 */
218 		put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID);
219 		put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR);
220 		put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM);
221 		put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD);
222 	}
223 	kfree(inti);
224 no_interrupt:
225 	/* Set condition code and we're done. */
226 	kvm_s390_set_psw_cc(vcpu, cc);
227 	return 0;
228 }
229 
230 static int handle_tsch(struct kvm_vcpu *vcpu)
231 {
232 	struct kvm_s390_interrupt_info *inti;
233 
234 	inti = kvm_s390_get_io_int(vcpu->kvm, 0,
235 				   vcpu->run->s.regs.gprs[1]);
236 
237 	/*
238 	 * Prepare exit to userspace.
239 	 * We indicate whether we dequeued a pending I/O interrupt
240 	 * so that userspace can re-inject it if the instruction gets
241 	 * a program check. While this may re-order the pending I/O
242 	 * interrupts, this is no problem since the priority is kept
243 	 * intact.
244 	 */
245 	vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
246 	vcpu->run->s390_tsch.dequeued = !!inti;
247 	if (inti) {
248 		vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
249 		vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
250 		vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
251 		vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
252 	}
253 	vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
254 	kfree(inti);
255 	return -EREMOTE;
256 }
257 
258 static int handle_io_inst(struct kvm_vcpu *vcpu)
259 {
260 	VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
261 
262 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
263 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
264 
265 	if (vcpu->kvm->arch.css_support) {
266 		/*
267 		 * Most I/O instructions will be handled by userspace.
268 		 * Exceptions are tpi and the interrupt portion of tsch.
269 		 */
270 		if (vcpu->arch.sie_block->ipa == 0xb236)
271 			return handle_tpi(vcpu);
272 		if (vcpu->arch.sie_block->ipa == 0xb235)
273 			return handle_tsch(vcpu);
274 		/* Handle in userspace. */
275 		return -EOPNOTSUPP;
276 	} else {
277 		/*
278 		 * Set condition code 3 to stop the guest from issuing channel
279 		 * I/O instructions.
280 		 */
281 		kvm_s390_set_psw_cc(vcpu, 3);
282 		return 0;
283 	}
284 }
285 
286 static int handle_stfl(struct kvm_vcpu *vcpu)
287 {
288 	int rc;
289 
290 	vcpu->stat.instruction_stfl++;
291 
292 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
293 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
294 
295 	rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
296 			   vfacilities, 4);
297 	if (rc)
298 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
299 	VCPU_EVENT(vcpu, 5, "store facility list value %x",
300 		   *(unsigned int *) vfacilities);
301 	trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
302 	return 0;
303 }
304 
305 static void handle_new_psw(struct kvm_vcpu *vcpu)
306 {
307 	/* Check whether the new psw is enabled for machine checks. */
308 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
309 		kvm_s390_deliver_pending_machine_checks(vcpu);
310 }
311 
312 #define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
313 #define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
314 #define PSW_ADDR_24 0x0000000000ffffffUL
315 #define PSW_ADDR_31 0x000000007fffffffUL
316 
317 static int is_valid_psw(psw_t *psw) {
318 	if (psw->mask & PSW_MASK_UNASSIGNED)
319 		return 0;
320 	if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
321 		if (psw->addr & ~PSW_ADDR_31)
322 			return 0;
323 	}
324 	if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
325 		return 0;
326 	if ((psw->mask & PSW_MASK_ADDR_MODE) ==  PSW_MASK_EA)
327 		return 0;
328 	return 1;
329 }
330 
331 int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
332 {
333 	psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
334 	psw_compat_t new_psw;
335 	u64 addr;
336 
337 	if (gpsw->mask & PSW_MASK_PSTATE)
338 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
339 
340 	addr = kvm_s390_get_base_disp_s(vcpu);
341 	if (addr & 7)
342 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
343 	if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
344 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
345 	if (!(new_psw.mask & PSW32_MASK_BASE))
346 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
347 	gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
348 	gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
349 	gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
350 	if (!is_valid_psw(gpsw))
351 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
352 	handle_new_psw(vcpu);
353 	return 0;
354 }
355 
356 static int handle_lpswe(struct kvm_vcpu *vcpu)
357 {
358 	psw_t new_psw;
359 	u64 addr;
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 	addr = kvm_s390_get_base_disp_s(vcpu);
365 	if (addr & 7)
366 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
367 	if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
368 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
369 	vcpu->arch.sie_block->gpsw = new_psw;
370 	if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
371 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
372 	handle_new_psw(vcpu);
373 	return 0;
374 }
375 
376 static int handle_stidp(struct kvm_vcpu *vcpu)
377 {
378 	u64 operand2;
379 
380 	vcpu->stat.instruction_stidp++;
381 
382 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
383 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
384 
385 	operand2 = kvm_s390_get_base_disp_s(vcpu);
386 
387 	if (operand2 & 7)
388 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
389 
390 	if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
391 		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
392 
393 	VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
394 	return 0;
395 }
396 
397 static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
398 {
399 	int cpus = 0;
400 	int n;
401 
402 	cpus = atomic_read(&vcpu->kvm->online_vcpus);
403 
404 	/* deal with other level 3 hypervisors */
405 	if (stsi(mem, 3, 2, 2))
406 		mem->count = 0;
407 	if (mem->count < 8)
408 		mem->count++;
409 	for (n = mem->count - 1; n > 0 ; n--)
410 		memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
411 
412 	mem->vm[0].cpus_total = cpus;
413 	mem->vm[0].cpus_configured = cpus;
414 	mem->vm[0].cpus_standby = 0;
415 	mem->vm[0].cpus_reserved = 0;
416 	mem->vm[0].caf = 1000;
417 	memcpy(mem->vm[0].name, "KVMguest", 8);
418 	ASCEBC(mem->vm[0].name, 8);
419 	memcpy(mem->vm[0].cpi, "KVM/Linux       ", 16);
420 	ASCEBC(mem->vm[0].cpi, 16);
421 }
422 
423 static int handle_stsi(struct kvm_vcpu *vcpu)
424 {
425 	int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
426 	int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
427 	int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
428 	unsigned long mem = 0;
429 	u64 operand2;
430 	int rc = 0;
431 
432 	vcpu->stat.instruction_stsi++;
433 	VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
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 	if (fc > 3) {
439 		kvm_s390_set_psw_cc(vcpu, 3);
440 		return 0;
441 	}
442 
443 	if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
444 	    || vcpu->run->s.regs.gprs[1] & 0xffff0000)
445 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
446 
447 	if (fc == 0) {
448 		vcpu->run->s.regs.gprs[0] = 3 << 28;
449 		kvm_s390_set_psw_cc(vcpu, 0);
450 		return 0;
451 	}
452 
453 	operand2 = kvm_s390_get_base_disp_s(vcpu);
454 
455 	if (operand2 & 0xfff)
456 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
457 
458 	switch (fc) {
459 	case 1: /* same handling for 1 and 2 */
460 	case 2:
461 		mem = get_zeroed_page(GFP_KERNEL);
462 		if (!mem)
463 			goto out_no_data;
464 		if (stsi((void *) mem, fc, sel1, sel2))
465 			goto out_no_data;
466 		break;
467 	case 3:
468 		if (sel1 != 2 || sel2 != 2)
469 			goto out_no_data;
470 		mem = get_zeroed_page(GFP_KERNEL);
471 		if (!mem)
472 			goto out_no_data;
473 		handle_stsi_3_2_2(vcpu, (void *) mem);
474 		break;
475 	}
476 
477 	if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
478 		rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
479 		goto out_exception;
480 	}
481 	trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
482 	free_page(mem);
483 	kvm_s390_set_psw_cc(vcpu, 0);
484 	vcpu->run->s.regs.gprs[0] = 0;
485 	return 0;
486 out_no_data:
487 	kvm_s390_set_psw_cc(vcpu, 3);
488 out_exception:
489 	free_page(mem);
490 	return rc;
491 }
492 
493 static const intercept_handler_t b2_handlers[256] = {
494 	[0x02] = handle_stidp,
495 	[0x04] = handle_set_clock,
496 	[0x10] = handle_set_prefix,
497 	[0x11] = handle_store_prefix,
498 	[0x12] = handle_store_cpu_address,
499 	[0x29] = handle_skey,
500 	[0x2a] = handle_skey,
501 	[0x2b] = handle_skey,
502 	[0x2c] = handle_test_block,
503 	[0x30] = handle_io_inst,
504 	[0x31] = handle_io_inst,
505 	[0x32] = handle_io_inst,
506 	[0x33] = handle_io_inst,
507 	[0x34] = handle_io_inst,
508 	[0x35] = handle_io_inst,
509 	[0x36] = handle_io_inst,
510 	[0x37] = handle_io_inst,
511 	[0x38] = handle_io_inst,
512 	[0x39] = handle_io_inst,
513 	[0x3a] = handle_io_inst,
514 	[0x3b] = handle_io_inst,
515 	[0x3c] = handle_io_inst,
516 	[0x5f] = handle_io_inst,
517 	[0x74] = handle_io_inst,
518 	[0x76] = handle_io_inst,
519 	[0x7d] = handle_stsi,
520 	[0xb1] = handle_stfl,
521 	[0xb2] = handle_lpswe,
522 };
523 
524 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
525 {
526 	intercept_handler_t handler;
527 
528 	/*
529 	 * A lot of B2 instructions are priviledged. Here we check for
530 	 * the privileged ones, that we can handle in the kernel.
531 	 * Anything else goes to userspace.
532 	 */
533 	handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
534 	if (handler)
535 		return handler(vcpu);
536 
537 	return -EOPNOTSUPP;
538 }
539 
540 static int handle_epsw(struct kvm_vcpu *vcpu)
541 {
542 	int reg1, reg2;
543 
544 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
545 
546 	/* This basically extracts the mask half of the psw. */
547 	vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
548 	vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
549 	if (reg2) {
550 		vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
551 		vcpu->run->s.regs.gprs[reg2] |=
552 			vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
553 	}
554 	return 0;
555 }
556 
557 #define PFMF_RESERVED   0xfffc0101UL
558 #define PFMF_SK         0x00020000UL
559 #define PFMF_CF         0x00010000UL
560 #define PFMF_UI         0x00008000UL
561 #define PFMF_FSC        0x00007000UL
562 #define PFMF_NQ         0x00000800UL
563 #define PFMF_MR         0x00000400UL
564 #define PFMF_MC         0x00000200UL
565 #define PFMF_KEY        0x000000feUL
566 
567 static int handle_pfmf(struct kvm_vcpu *vcpu)
568 {
569 	int reg1, reg2;
570 	unsigned long start, end;
571 
572 	vcpu->stat.instruction_pfmf++;
573 
574 	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
575 
576 	if (!MACHINE_HAS_PFMF)
577 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
578 
579 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
580 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
581 
582 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
583 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
584 
585 	/* Only provide non-quiescing support if the host supports it */
586 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
587 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
588 
589 	/* No support for conditional-SSKE */
590 	if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
591 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
592 
593 	start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
594 	switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
595 	case 0x00000000:
596 		end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
597 		break;
598 	case 0x00001000:
599 		end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
600 		break;
601 	/* We dont support EDAT2
602 	case 0x00002000:
603 		end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
604 		break;*/
605 	default:
606 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
607 	}
608 	while (start < end) {
609 		unsigned long useraddr;
610 
611 		useraddr = gmap_translate(start, vcpu->arch.gmap);
612 		if (IS_ERR((void *)useraddr))
613 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
614 
615 		if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
616 			if (clear_user((void __user *)useraddr, PAGE_SIZE))
617 				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
618 		}
619 
620 		if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
621 			if (set_guest_storage_key(current->mm, useraddr,
622 					vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
623 					vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
624 				return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
625 		}
626 
627 		start += PAGE_SIZE;
628 	}
629 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
630 		vcpu->run->s.regs.gprs[reg2] = end;
631 	return 0;
632 }
633 
634 static int handle_essa(struct kvm_vcpu *vcpu)
635 {
636 	/* entries expected to be 1FF */
637 	int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
638 	unsigned long *cbrlo, cbrle;
639 	struct gmap *gmap;
640 	int i;
641 
642 	VCPU_EVENT(vcpu, 5, "cmma release %d pages", entries);
643 	gmap = vcpu->arch.gmap;
644 	vcpu->stat.instruction_essa++;
645 	if (!kvm_enabled_cmma() || !vcpu->arch.sie_block->cbrlo)
646 		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
647 
648 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
649 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
650 
651 	if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
652 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
653 
654 	/* Rewind PSW to repeat the ESSA instruction */
655 	vcpu->arch.sie_block->gpsw.addr =
656 		__rewind_psw(vcpu->arch.sie_block->gpsw, 4);
657 	vcpu->arch.sie_block->cbrlo &= PAGE_MASK;	/* reset nceo */
658 	cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
659 	down_read(&gmap->mm->mmap_sem);
660 	for (i = 0; i < entries; ++i) {
661 		cbrle = cbrlo[i];
662 		if (unlikely(cbrle & ~PAGE_MASK || cbrle < 2 * PAGE_SIZE))
663 			/* invalid entry */
664 			break;
665 		/* try to free backing */
666 		__gmap_zap(cbrle, gmap);
667 	}
668 	up_read(&gmap->mm->mmap_sem);
669 	if (i < entries)
670 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
671 	return 0;
672 }
673 
674 static const intercept_handler_t b9_handlers[256] = {
675 	[0x8d] = handle_epsw,
676 	[0xab] = handle_essa,
677 	[0xaf] = handle_pfmf,
678 };
679 
680 int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
681 {
682 	intercept_handler_t handler;
683 
684 	/* This is handled just as for the B2 instructions. */
685 	handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
686 	if (handler)
687 		return handler(vcpu);
688 
689 	return -EOPNOTSUPP;
690 }
691 
692 int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
693 {
694 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
695 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
696 	u64 useraddr;
697 	u32 val = 0;
698 	int reg, rc;
699 
700 	vcpu->stat.instruction_lctl++;
701 
702 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
703 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
704 
705 	useraddr = kvm_s390_get_base_disp_rs(vcpu);
706 
707 	if (useraddr & 3)
708 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
709 
710 	VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
711 		   useraddr);
712 	trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
713 
714 	reg = reg1;
715 	do {
716 		rc = get_guest(vcpu, val, (u32 __user *) useraddr);
717 		if (rc)
718 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
719 		vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
720 		vcpu->arch.sie_block->gcr[reg] |= val;
721 		useraddr += 4;
722 		if (reg == reg3)
723 			break;
724 		reg = (reg + 1) % 16;
725 	} while (1);
726 
727 	return 0;
728 }
729 
730 static int handle_lctlg(struct kvm_vcpu *vcpu)
731 {
732 	int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
733 	int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
734 	u64 useraddr;
735 	int reg, rc;
736 
737 	vcpu->stat.instruction_lctlg++;
738 
739 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
740 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
741 
742 	useraddr = kvm_s390_get_base_disp_rsy(vcpu);
743 
744 	if (useraddr & 7)
745 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
746 
747 	reg = reg1;
748 
749 	VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
750 		   useraddr);
751 	trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
752 
753 	do {
754 		rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg],
755 			       (u64 __user *) useraddr);
756 		if (rc)
757 			return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
758 		useraddr += 8;
759 		if (reg == reg3)
760 			break;
761 		reg = (reg + 1) % 16;
762 	} while (1);
763 
764 	return 0;
765 }
766 
767 static const intercept_handler_t eb_handlers[256] = {
768 	[0x2f] = handle_lctlg,
769 };
770 
771 int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
772 {
773 	intercept_handler_t handler;
774 
775 	handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
776 	if (handler)
777 		return handler(vcpu);
778 	return -EOPNOTSUPP;
779 }
780 
781 static int handle_tprot(struct kvm_vcpu *vcpu)
782 {
783 	u64 address1, address2;
784 	struct vm_area_struct *vma;
785 	unsigned long user_address;
786 
787 	vcpu->stat.instruction_tprot++;
788 
789 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
790 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
791 
792 	kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
793 
794 	/* we only handle the Linux memory detection case:
795 	 * access key == 0
796 	 * guest DAT == off
797 	 * everything else goes to userspace. */
798 	if (address2 & 0xf0)
799 		return -EOPNOTSUPP;
800 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
801 		return -EOPNOTSUPP;
802 
803 	down_read(&current->mm->mmap_sem);
804 	user_address = __gmap_translate(address1, vcpu->arch.gmap);
805 	if (IS_ERR_VALUE(user_address))
806 		goto out_inject;
807 	vma = find_vma(current->mm, user_address);
808 	if (!vma)
809 		goto out_inject;
810 	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
811 	if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
812 		vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
813 	if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
814 		vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
815 
816 	up_read(&current->mm->mmap_sem);
817 	return 0;
818 
819 out_inject:
820 	up_read(&current->mm->mmap_sem);
821 	return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
822 }
823 
824 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
825 {
826 	/* For e5xx... instructions we only handle TPROT */
827 	if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
828 		return handle_tprot(vcpu);
829 	return -EOPNOTSUPP;
830 }
831 
832 static int handle_sckpf(struct kvm_vcpu *vcpu)
833 {
834 	u32 value;
835 
836 	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
837 		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
838 
839 	if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
840 		return kvm_s390_inject_program_int(vcpu,
841 						   PGM_SPECIFICATION);
842 
843 	value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
844 	vcpu->arch.sie_block->todpr = value;
845 
846 	return 0;
847 }
848 
849 static const intercept_handler_t x01_handlers[256] = {
850 	[0x07] = handle_sckpf,
851 };
852 
853 int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
854 {
855 	intercept_handler_t handler;
856 
857 	handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
858 	if (handler)
859 		return handler(vcpu);
860 	return -EOPNOTSUPP;
861 }
862