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KVM: s390: Implement TEST BLOCK
[deliverable/linux.git] / arch / s390 / kvm / priv.c
CommitLineData
453423dc 1/*
a53c8fab 2 * handling privileged instructions
453423dc 3 *
69d0d3a3 4 * Copyright IBM Corp. 2008, 2013
453423dc
CB		 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>
5a0e3ad6 15#include <linux/gfp.h>
453423dc 16#include <linux/errno.h>
b13b5dc7 17#include <linux/compat.h>
7c959e82 18#include <asm/asm-offsets.h>
e769ece3 19#include <asm/facility.h>
453423dc
CB		 20#include <asm/current.h>
21#include <asm/debug.h>
22#include <asm/ebcdic.h>
23#include <asm/sysinfo.h>
69d0d3a3
CB		 24#include <asm/pgtable.h>
25#include <asm/pgalloc.h>
26#include <asm/io.h>
48a3e950
CH		 27#include <asm/ptrace.h>
28#include <asm/compat.h>
453423dc
CB		 29#include "gaccess.h"
30#include "kvm-s390.h"
5786fffa 31#include "trace.h"
453423dc
CB		 32
33static int handle_set_prefix(struct kvm_vcpu *vcpu)
34{
453423dc
CB		 35 u64 operand2;
36 u32 address = 0;
37 u8 tmp;
38
39 vcpu->stat.instruction_spx++;
40
5087dfa6
TH		 41 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
42 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
43
b1c571a5 44 operand2 = kvm_s390_get_base_disp_s(vcpu);
453423dc
CB		 45
46 /* must be word boundary */
db4a29cb
HC		 47 if (operand2 & 3)
48 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
453423dc
CB		 49
50 /* get the value */
db4a29cb
HC		 51 if (get_guest(vcpu, address, (u32 __user *) operand2))
52 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
453423dc
CB		 53
54 address = address & 0x7fffe000u;
55
56 /* make sure that the new value is valid memory */
57 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
db4a29cb
HC		 58 (copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)))
59 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
453423dc 60
8d26cf7b 61 kvm_s390_set_prefix(vcpu, address);
453423dc
CB		 62
63 VCPU_EVENT(vcpu, 5, "setting prefix to %x", address);
5786fffa 64 trace_kvm_s390_handle_prefix(vcpu, 1, address);
453423dc
CB		 65 return 0;
66}
67
68static int handle_store_prefix(struct kvm_vcpu *vcpu)
69{
453423dc
CB		 70 u64 operand2;
71 u32 address;
72
73 vcpu->stat.instruction_stpx++;
b1c571a5 74
5087dfa6
TH		 75 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
76 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
77
b1c571a5 78 operand2 = kvm_s390_get_base_disp_s(vcpu);
453423dc
CB		 79
80 /* must be word boundary */
db4a29cb
HC		 81 if (operand2 & 3)
82 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
453423dc
CB		 83
84 address = vcpu->arch.sie_block->prefix;
85 address = address & 0x7fffe000u;
86
87 /* get the value */
db4a29cb
HC		 88 if (put_guest(vcpu, address, (u32 __user *)operand2))
89 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
453423dc
CB		 90
91 VCPU_EVENT(vcpu, 5, "storing prefix to %x", address);
5786fffa 92 trace_kvm_s390_handle_prefix(vcpu, 0, address);
453423dc
CB		 93 return 0;
94}
95
96static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
97{
453423dc 98 u64 useraddr;
453423dc
CB		 99
100 vcpu->stat.instruction_stap++;
b1c571a5 101
5087dfa6
TH		 102 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
103 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
104
b1c571a5 105 useraddr = kvm_s390_get_base_disp_s(vcpu);
453423dc 106
db4a29cb
HC		 107 if (useraddr & 1)
108 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
453423dc 109
db4a29cb
HC		 110 if (put_guest(vcpu, vcpu->vcpu_id, (u16 __user *)useraddr))
111 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
453423dc 112
33e19115 113 VCPU_EVENT(vcpu, 5, "storing cpu address to %llx", useraddr);
5786fffa 114 trace_kvm_s390_handle_stap(vcpu, useraddr);
453423dc
CB		 115 return 0;
116}
117
118static int handle_skey(struct kvm_vcpu *vcpu)
119{
120 vcpu->stat.instruction_storage_key++;
5087dfa6
TH		 121
122 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
123 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
124
dfcf7dc6
MS		 125 vcpu->arch.sie_block->gpsw.addr =
126 __rewind_psw(vcpu->arch.sie_block->gpsw, 4);
453423dc
CB		 127 VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
128 return 0;
129}
130
aca84241
TH		 131static int handle_test_block(struct kvm_vcpu *vcpu)
132{
133 unsigned long hva;
134 gpa_t addr;
135 int reg2;
136
137 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
138 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
139
140 kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
141 addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
142 addr = kvm_s390_real_to_abs(vcpu, addr);
143
144 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
145 if (kvm_is_error_hva(hva))
146 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
147 /*
148 * We don't expect errors on modern systems, and do not care
149 * about storage keys (yet), so let's just clear the page.
150 */
151 if (clear_user((void __user *)hva, PAGE_SIZE) != 0)
152 return -EFAULT;
153 kvm_s390_set_psw_cc(vcpu, 0);
154 vcpu->run->s.regs.gprs[0] = 0;
155 return 0;
156}
157
fa6b7fe9 158static int handle_tpi(struct kvm_vcpu *vcpu)
453423dc 159{
fa6b7fe9 160 struct kvm_s390_interrupt_info *inti;
7c959e82 161 u64 addr;
fa6b7fe9
CH		 162 int cc;
163
164 addr = kvm_s390_get_base_disp_s(vcpu);
db4a29cb
HC		 165 if (addr & 3)
166 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
7c959e82 167 cc = 0;
fa6b7fe9 168 inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0);
7c959e82
HC		 169 if (!inti)
170 goto no_interrupt;
171 cc = 1;
172 if (addr) {
173 /*
174 * Store the two-word I/O interruption code into the
175 * provided area.
176 */
133608f3
TH		 177 if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr)
178 || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2))
179 || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4)))
180 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
7c959e82
HC		 181 } else {
182 /*
183 * Store the three-word I/O interruption code into
184 * the appropriate lowcore area.
185 */
0a75ca27
HC		 186 put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) __LC_SUBCHANNEL_ID);
187 put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) __LC_SUBCHANNEL_NR);
188 put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) __LC_IO_INT_PARM);
189 put_guest(vcpu, inti->io.io_int_word, (u32 __user *) __LC_IO_INT_WORD);
7c959e82 190 }
fa6b7fe9 191 kfree(inti);
7c959e82 192no_interrupt:
fa6b7fe9 193 /* Set condition code and we're done. */
ea828ebf 194 kvm_s390_set_psw_cc(vcpu, cc);
453423dc
CB		 195 return 0;
196}
197
fa6b7fe9
CH		 198static int handle_tsch(struct kvm_vcpu *vcpu)
199{
200 struct kvm_s390_interrupt_info *inti;
201
202 inti = kvm_s390_get_io_int(vcpu->kvm, 0,
203 vcpu->run->s.regs.gprs[1]);
204
205 /*
206 * Prepare exit to userspace.
207 * We indicate whether we dequeued a pending I/O interrupt
208 * so that userspace can re-inject it if the instruction gets
209 * a program check. While this may re-order the pending I/O
210 * interrupts, this is no problem since the priority is kept
211 * intact.
212 */
213 vcpu->run->exit_reason = KVM_EXIT_S390_TSCH;
214 vcpu->run->s390_tsch.dequeued = !!inti;
215 if (inti) {
216 vcpu->run->s390_tsch.subchannel_id = inti->io.subchannel_id;
217 vcpu->run->s390_tsch.subchannel_nr = inti->io.subchannel_nr;
218 vcpu->run->s390_tsch.io_int_parm = inti->io.io_int_parm;
219 vcpu->run->s390_tsch.io_int_word = inti->io.io_int_word;
220 }
221 vcpu->run->s390_tsch.ipb = vcpu->arch.sie_block->ipb;
222 kfree(inti);
223 return -EREMOTE;
224}
225
226static int handle_io_inst(struct kvm_vcpu *vcpu)
227{
228 VCPU_EVENT(vcpu, 4, "%s", "I/O instruction");
229
5087dfa6
TH		 230 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
231 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
232
fa6b7fe9
CH		 233 if (vcpu->kvm->arch.css_support) {
234 /*
235 * Most I/O instructions will be handled by userspace.
236 * Exceptions are tpi and the interrupt portion of tsch.
237 */
238 if (vcpu->arch.sie_block->ipa == 0xb236)
239 return handle_tpi(vcpu);
240 if (vcpu->arch.sie_block->ipa == 0xb235)
241 return handle_tsch(vcpu);
242 /* Handle in userspace. */
243 return -EOPNOTSUPP;
244 } else {
245 /*
246 * Set condition code 3 to stop the guest from issueing channel
247 * I/O instructions.
248 */
ea828ebf 249 kvm_s390_set_psw_cc(vcpu, 3);
fa6b7fe9
CH		 250 return 0;
251 }
252}
253
453423dc
CB		 254static int handle_stfl(struct kvm_vcpu *vcpu)
255{
453423dc
CB		 256 int rc;
257
258 vcpu->stat.instruction_stfl++;
5087dfa6
TH		 259
260 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
261 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
262
453423dc 263 rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
78c4b59f 264 vfacilities, 4);
dc5008b9 265 if (rc)
db4a29cb 266 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
78c4b59f
MM		 267 VCPU_EVENT(vcpu, 5, "store facility list value %x",
268 *(unsigned int *) vfacilities);
269 trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
453423dc
CB		 270 return 0;
271}
272
48a3e950
CH		 273static void handle_new_psw(struct kvm_vcpu *vcpu)
274{
275 /* Check whether the new psw is enabled for machine checks. */
276 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
277 kvm_s390_deliver_pending_machine_checks(vcpu);
278}
279
280#define PSW_MASK_ADDR_MODE (PSW_MASK_EA | PSW_MASK_BA)
281#define PSW_MASK_UNASSIGNED 0xb80800fe7fffffffUL
d21683ea 282#define PSW_ADDR_24 0x0000000000ffffffUL
48a3e950
CH		 283#define PSW_ADDR_31 0x000000007fffffffUL
284
3736b874
HC		 285static int is_valid_psw(psw_t *psw) {
286 if (psw->mask & PSW_MASK_UNASSIGNED)
287 return 0;
288 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
289 if (psw->addr & ~PSW_ADDR_31)
290 return 0;
291 }
292 if (!(psw->mask & PSW_MASK_ADDR_MODE) && (psw->addr & ~PSW_ADDR_24))
293 return 0;
294 if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
295 return 0;
296 return 1;
297}
298
48a3e950
CH		 299int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
300{
3736b874 301 psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
48a3e950 302 psw_compat_t new_psw;
3736b874 303 u64 addr;
48a3e950 304
3736b874 305 if (gpsw->mask & PSW_MASK_PSTATE)
208dd756
TH		 306 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
307
48a3e950 308 addr = kvm_s390_get_base_disp_s(vcpu);
6fd0fcc9
HC		 309 if (addr & 7)
310 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
6fd0fcc9
HC		 311 if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
312 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
6fd0fcc9
HC		 313 if (!(new_psw.mask & PSW32_MASK_BASE))
314 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
3736b874
HC		 315 gpsw->mask = (new_psw.mask & ~PSW32_MASK_BASE) << 32;
316 gpsw->mask |= new_psw.addr & PSW32_ADDR_AMODE;
317 gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
318 if (!is_valid_psw(gpsw))
6fd0fcc9 319 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
48a3e950 320 handle_new_psw(vcpu);
48a3e950
CH		 321 return 0;
322}
323
324static int handle_lpswe(struct kvm_vcpu *vcpu)
325{
48a3e950 326 psw_t new_psw;
3736b874 327 u64 addr;
48a3e950 328
5087dfa6
TH		 329 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
330 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
331
48a3e950 332 addr = kvm_s390_get_base_disp_s(vcpu);
6fd0fcc9
HC		 333 if (addr & 7)
334 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
6fd0fcc9
HC		 335 if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw)))
336 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
3736b874
HC		 337 vcpu->arch.sie_block->gpsw = new_psw;
338 if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
6fd0fcc9 339 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
48a3e950 340 handle_new_psw(vcpu);
48a3e950
CH		 341 return 0;
342}
343
453423dc
CB		 344static int handle_stidp(struct kvm_vcpu *vcpu)
345{
453423dc 346 u64 operand2;
453423dc
CB		 347
348 vcpu->stat.instruction_stidp++;
b1c571a5 349
5087dfa6
TH		 350 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
351 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
352
b1c571a5 353 operand2 = kvm_s390_get_base_disp_s(vcpu);
453423dc 354
db4a29cb
HC		 355 if (operand2 & 7)
356 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
453423dc 357
db4a29cb
HC		 358 if (put_guest(vcpu, vcpu->arch.stidp_data, (u64 __user *)operand2))
359 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
453423dc
CB		 360
361 VCPU_EVENT(vcpu, 5, "%s", "store cpu id");
453423dc
CB		 362 return 0;
363}
364
365static void handle_stsi_3_2_2(struct kvm_vcpu *vcpu, struct sysinfo_3_2_2 *mem)
366{
180c12fb 367 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
453423dc
CB		 368 int cpus = 0;
369 int n;
370
b037a4f3 371 spin_lock(&fi->lock);
453423dc
CB		 372 for (n = 0; n < KVM_MAX_VCPUS; n++)
373 if (fi->local_int[n])
374 cpus++;
b037a4f3 375 spin_unlock(&fi->lock);
453423dc
CB		 376
377 /* deal with other level 3 hypervisors */
caf757c6 378 if (stsi(mem, 3, 2, 2))
453423dc
CB		 379 mem->count = 0;
380 if (mem->count < 8)
381 mem->count++;
382 for (n = mem->count - 1; n > 0 ; n--)
383 memcpy(&mem->vm[n], &mem->vm[n - 1], sizeof(mem->vm[0]));
384
385 mem->vm[0].cpus_total = cpus;
386 mem->vm[0].cpus_configured = cpus;
387 mem->vm[0].cpus_standby = 0;
388 mem->vm[0].cpus_reserved = 0;
389 mem->vm[0].caf = 1000;
390 memcpy(mem->vm[0].name, "KVMguest", 8);
391 ASCEBC(mem->vm[0].name, 8);
392 memcpy(mem->vm[0].cpi, "KVM/Linux ", 16);
393 ASCEBC(mem->vm[0].cpi, 16);
394}
395
396static int handle_stsi(struct kvm_vcpu *vcpu)
397{
5a32c1af
CB		 398 int fc = (vcpu->run->s.regs.gprs[0] & 0xf0000000) >> 28;
399 int sel1 = vcpu->run->s.regs.gprs[0] & 0xff;
400 int sel2 = vcpu->run->s.regs.gprs[1] & 0xffff;
c51f068c 401 unsigned long mem = 0;
453423dc 402 u64 operand2;
db4a29cb 403 int rc = 0;
453423dc
CB		 404
405 vcpu->stat.instruction_stsi++;
406 VCPU_EVENT(vcpu, 4, "stsi: fc: %x sel1: %x sel2: %x", fc, sel1, sel2);
407
5087dfa6
TH		 408 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
409 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
410
87d41fb4 411 if (fc > 3) {
ea828ebf 412 kvm_s390_set_psw_cc(vcpu, 3);
87d41fb4
TH		 413 return 0;
414 }
453423dc 415
87d41fb4
TH		 416 if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
417 || vcpu->run->s.regs.gprs[1] & 0xffff0000)
453423dc
CB		 418 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
419
87d41fb4 420 if (fc == 0) {
5a32c1af 421 vcpu->run->s.regs.gprs[0] = 3 << 28;
ea828ebf 422 kvm_s390_set_psw_cc(vcpu, 0);
453423dc 423 return 0;
87d41fb4
TH		 424 }
425
426 operand2 = kvm_s390_get_base_disp_s(vcpu);
427
428 if (operand2 & 0xfff)
429 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
430
431 switch (fc) {
453423dc
CB		 432 case 1: /* same handling for 1 and 2 */
433 case 2:
434 mem = get_zeroed_page(GFP_KERNEL);
435 if (!mem)
c51f068c 436 goto out_no_data;
caf757c6 437 if (stsi((void *) mem, fc, sel1, sel2))
c51f068c 438 goto out_no_data;
453423dc
CB		 439 break;
440 case 3:
441 if (sel1 != 2 || sel2 != 2)
c51f068c 442 goto out_no_data;
453423dc
CB		 443 mem = get_zeroed_page(GFP_KERNEL);
444 if (!mem)
c51f068c 445 goto out_no_data;
453423dc
CB		 446 handle_stsi_3_2_2(vcpu, (void *) mem);
447 break;
453423dc
CB		 448 }
449
450 if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {
db4a29cb 451 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
c51f068c 452 goto out_exception;
453423dc 453 }
5786fffa 454 trace_kvm_s390_handle_stsi(vcpu, fc, sel1, sel2, operand2);
453423dc 455 free_page(mem);
ea828ebf 456 kvm_s390_set_psw_cc(vcpu, 0);
5a32c1af 457 vcpu->run->s.regs.gprs[0] = 0;
453423dc 458 return 0;
c51f068c 459out_no_data:
ea828ebf 460 kvm_s390_set_psw_cc(vcpu, 3);
c51f068c
HC		 461out_exception:
462 free_page(mem);
db4a29cb 463 return rc;
453423dc
CB		 464}
465
f379aae5 466static const intercept_handler_t b2_handlers[256] = {
453423dc
CB		 467 [0x02] = handle_stidp,
468 [0x10] = handle_set_prefix,
469 [0x11] = handle_store_prefix,
470 [0x12] = handle_store_cpu_address,
471 [0x29] = handle_skey,
472 [0x2a] = handle_skey,
473 [0x2b] = handle_skey,
aca84241 474 [0x2c] = handle_test_block,
f379aae5
CH		 475 [0x30] = handle_io_inst,
476 [0x31] = handle_io_inst,
477 [0x32] = handle_io_inst,
478 [0x33] = handle_io_inst,
479 [0x34] = handle_io_inst,
480 [0x35] = handle_io_inst,
481 [0x36] = handle_io_inst,
482 [0x37] = handle_io_inst,
483 [0x38] = handle_io_inst,
484 [0x39] = handle_io_inst,
485 [0x3a] = handle_io_inst,
486 [0x3b] = handle_io_inst,
487 [0x3c] = handle_io_inst,
488 [0x5f] = handle_io_inst,
489 [0x74] = handle_io_inst,
490 [0x76] = handle_io_inst,
453423dc
CB		 491 [0x7d] = handle_stsi,
492 [0xb1] = handle_stfl,
48a3e950 493 [0xb2] = handle_lpswe,
453423dc
CB		 494};
495
70455a36 496int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
453423dc
CB		 497{
498 intercept_handler_t handler;
499
70455a36 500 /*
5087dfa6
TH		 501 * A lot of B2 instructions are priviledged. Here we check for
502 * the privileged ones, that we can handle in the kernel.
503 * Anything else goes to userspace.
504 */
f379aae5 505 handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
5087dfa6
TH		 506 if (handler)
507 return handler(vcpu);
508
b8e660b8 509 return -EOPNOTSUPP;
453423dc 510}
bb25b9ba 511
48a3e950
CH		 512static int handle_epsw(struct kvm_vcpu *vcpu)
513{
514 int reg1, reg2;
515
aeb87c3c 516 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
48a3e950
CH		 517
518 /* This basically extracts the mask half of the psw. */
843200e7 519 vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000UL;
48a3e950
CH		 520 vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
521 if (reg2) {
843200e7 522 vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000UL;
48a3e950 523 vcpu->run->s.regs.gprs[reg2] |=
843200e7 524 vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffffUL;
48a3e950
CH		 525 }
526 return 0;
527}
528
69d0d3a3
CB		 529#define PFMF_RESERVED 0xfffc0101UL
530#define PFMF_SK 0x00020000UL
531#define PFMF_CF 0x00010000UL
532#define PFMF_UI 0x00008000UL
533#define PFMF_FSC 0x00007000UL
534#define PFMF_NQ 0x00000800UL
535#define PFMF_MR 0x00000400UL
536#define PFMF_MC 0x00000200UL
537#define PFMF_KEY 0x000000feUL
538
539static int handle_pfmf(struct kvm_vcpu *vcpu)
540{
541 int reg1, reg2;
542 unsigned long start, end;
543
544 vcpu->stat.instruction_pfmf++;
545
546 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
547
548 if (!MACHINE_HAS_PFMF)
549 return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
550
551 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
208dd756 552 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
69d0d3a3
CB		 553
554 if (vcpu->run->s.regs.gprs[reg1] & PFMF_RESERVED)
555 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
556
557 /* Only provide non-quiescing support if the host supports it */
e769ece3 558 if (vcpu->run->s.regs.gprs[reg1] & PFMF_NQ && !test_facility(14))
69d0d3a3
CB		 559 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
560
561 /* No support for conditional-SSKE */
562 if (vcpu->run->s.regs.gprs[reg1] & (PFMF_MR | PFMF_MC))
563 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
564
565 start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
566 switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
567 case 0x00000000:
568 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
569 break;
570 case 0x00001000:
571 end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
572 break;
573 /* We dont support EDAT2
574 case 0x00002000:
575 end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
576 break;*/
577 default:
578 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
579 }
580 while (start < end) {
581 unsigned long useraddr;
582
583 useraddr = gmap_translate(start, vcpu->arch.gmap);
584 if (IS_ERR((void *)useraddr))
585 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
586
587 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
588 if (clear_user((void __user *)useraddr, PAGE_SIZE))
589 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
590 }
591
592 if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
593 if (set_guest_storage_key(current->mm, useraddr,
594 vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
595 vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))
596 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
597 }
598
599 start += PAGE_SIZE;
600 }
601 if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC)
602 vcpu->run->s.regs.gprs[reg2] = end;
603 return 0;
604}
605
48a3e950
CH		 606static const intercept_handler_t b9_handlers[256] = {
607 [0x8d] = handle_epsw,
f379aae5 608 [0x9c] = handle_io_inst,
69d0d3a3 609 [0xaf] = handle_pfmf,
48a3e950
CH		 610};
611
612int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
613{
614 intercept_handler_t handler;
615
616 /* This is handled just as for the B2 instructions. */
617 handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
5087dfa6
TH		 618 if (handler)
619 return handler(vcpu);
620
48a3e950
CH		 621 return -EOPNOTSUPP;
622}
623
953ed88d
TH		 624int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
625{
626 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
627 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
628 u64 useraddr;
629 u32 val = 0;
630 int reg, rc;
631
632 vcpu->stat.instruction_lctl++;
633
634 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
635 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
636
637 useraddr = kvm_s390_get_base_disp_rs(vcpu);
638
639 if (useraddr & 3)
640 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
641
642 VCPU_EVENT(vcpu, 5, "lctl r1:%x, r3:%x, addr:%llx", reg1, reg3,
643 useraddr);
644 trace_kvm_s390_handle_lctl(vcpu, 0, reg1, reg3, useraddr);
645
646 reg = reg1;
647 do {
648 rc = get_guest(vcpu, val, (u32 __user *) useraddr);
649 if (rc)
650 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
651 vcpu->arch.sie_block->gcr[reg] &= 0xffffffff00000000ul;
652 vcpu->arch.sie_block->gcr[reg] |= val;
653 useraddr += 4;
654 if (reg == reg3)
655 break;
656 reg = (reg + 1) % 16;
657 } while (1);
658
659 return 0;
660}
661
662static int handle_lctlg(struct kvm_vcpu *vcpu)
663{
664 int reg1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
665 int reg3 = vcpu->arch.sie_block->ipa & 0x000f;
666 u64 useraddr;
667 int reg, rc;
668
669 vcpu->stat.instruction_lctlg++;
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 useraddr = kvm_s390_get_base_disp_rsy(vcpu);
675
676 if (useraddr & 7)
677 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
678
679 reg = reg1;
680
681 VCPU_EVENT(vcpu, 5, "lctlg r1:%x, r3:%x, addr:%llx", reg1, reg3,
682 useraddr);
683 trace_kvm_s390_handle_lctl(vcpu, 1, reg1, reg3, useraddr);
684
685 do {
686 rc = get_guest(vcpu, vcpu->arch.sie_block->gcr[reg],
687 (u64 __user *) useraddr);
688 if (rc)
689 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
690 useraddr += 8;
691 if (reg == reg3)
692 break;
693 reg = (reg + 1) % 16;
694 } while (1);
695
696 return 0;
697}
698
f379aae5 699static const intercept_handler_t eb_handlers[256] = {
953ed88d 700 [0x2f] = handle_lctlg,
f379aae5
CH		 701 [0x8a] = handle_io_inst,
702};
703
953ed88d 704int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
f379aae5
CH		 705{
706 intercept_handler_t handler;
707
f379aae5
CH		 708 handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
709 if (handler)
710 return handler(vcpu);
711 return -EOPNOTSUPP;
712}
713
bb25b9ba
CB		 714static int handle_tprot(struct kvm_vcpu *vcpu)
715{
b1c571a5 716 u64 address1, address2;
bb25b9ba 717 struct vm_area_struct *vma;
1eddb85f 718 unsigned long user_address;
bb25b9ba
CB		 719
720 vcpu->stat.instruction_tprot++;
721
f9f6bbc6
TH		 722 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
723 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
724
b1c571a5
CH		 725 kvm_s390_get_base_disp_sse(vcpu, &address1, &address2);
726
bb25b9ba
CB		 727 /* we only handle the Linux memory detection case:
728 * access key == 0
729 * guest DAT == off
730 * everything else goes to userspace. */
731 if (address2 & 0xf0)
732 return -EOPNOTSUPP;
733 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
734 return -EOPNOTSUPP;
735
bb25b9ba 736 down_read(&current->mm->mmap_sem);
59a1fa2d
HC		 737 user_address = __gmap_translate(address1, vcpu->arch.gmap);
738 if (IS_ERR_VALUE(user_address))
739 goto out_inject;
1eddb85f 740 vma = find_vma(current->mm, user_address);
59a1fa2d
HC		 741 if (!vma)
742 goto out_inject;
bb25b9ba
CB		 743 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
744 if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
745 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
746 if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
747 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
748
749 up_read(&current->mm->mmap_sem);
750 return 0;
59a1fa2d
HC		 751
752out_inject:
753 up_read(&current->mm->mmap_sem);
754 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
bb25b9ba
CB		 755}
756
757int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
758{
759 /* For e5xx... instructions we only handle TPROT */
760 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
761 return handle_tprot(vcpu);
762 return -EOPNOTSUPP;
763}
764
8c3f61e2
CH		 765static int handle_sckpf(struct kvm_vcpu *vcpu)
766{
767 u32 value;
768
769 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
208dd756 770 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
8c3f61e2
CH		 771
772 if (vcpu->run->s.regs.gprs[0] & 0x00000000ffff0000)
773 return kvm_s390_inject_program_int(vcpu,
774 PGM_SPECIFICATION);
775
776 value = vcpu->run->s.regs.gprs[0] & 0x000000000000ffff;
777 vcpu->arch.sie_block->todpr = value;
778
779 return 0;
780}
781
77975357 782static const intercept_handler_t x01_handlers[256] = {
8c3f61e2
CH		 783 [0x07] = handle_sckpf,
784};
785
786int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
787{
788 intercept_handler_t handler;
789
790 handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
791 if (handler)
792 return handler(vcpu);
793 return -EOPNOTSUPP;
794}
Linux kernel - Deliverables
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