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KVM: s390: Add clock comparator and CPU timer IRQ injection
[deliverable/linux.git] / arch / s390 / kvm / intercept.c
CommitLineData
8f2abe6a 1/*
a53c8fab 2 * in-kernel handling for sie intercepts
8f2abe6a 3 *
9a558ee3 4 * Copyright IBM Corp. 2008, 2014
8f2abe6a
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_host.h>
15#include <linux/errno.h>
16#include <linux/pagemap.h>
17
18#include <asm/kvm_host.h>
a86dcc24 19#include <asm/asm-offsets.h>
8f2abe6a
CB		 20
21#include "kvm-s390.h"
ba5c1e9b 22#include "gaccess.h"
5786fffa 23#include "trace.h"
ade38c31 24#include "trace-s390.h"
ba5c1e9b 25
f379aae5 26
77975357 27static const intercept_handler_t instruction_handlers[256] = {
8c3f61e2 28 [0x01] = kvm_s390_handle_01,
48a3e950 29 [0x82] = kvm_s390_handle_lpsw,
e28acfea 30 [0x83] = kvm_s390_handle_diag,
5288fbf0 31 [0xae] = kvm_s390_handle_sigp,
70455a36 32 [0xb2] = kvm_s390_handle_b2,
aba07508 33 [0xb6] = kvm_s390_handle_stctl,
953ed88d 34 [0xb7] = kvm_s390_handle_lctl,
48a3e950 35 [0xb9] = kvm_s390_handle_b9,
bb25b9ba 36 [0xe5] = kvm_s390_handle_e5,
953ed88d 37 [0xeb] = kvm_s390_handle_eb,
ba5c1e9b 38};
8f2abe6a
CB		 39
40static int handle_noop(struct kvm_vcpu *vcpu)
41{
42 switch (vcpu->arch.sie_block->icptcode) {
0eaeafa1
CB		 43 case 0x0:
44 vcpu->stat.exit_null++;
45 break;
8f2abe6a
CB		 46 case 0x10:
47 vcpu->stat.exit_external_request++;
48 break;
49 case 0x14:
50 vcpu->stat.exit_external_interrupt++;
51 break;
52 default:
53 break; /* nothing */
54 }
55 return 0;
56}
57
58static int handle_stop(struct kvm_vcpu *vcpu)
59{
9ace903d 60 int rc = 0;
5288fbf0 61
8f2abe6a 62 vcpu->stat.exit_stop_request++;
5288fbf0 63 spin_lock_bh(&vcpu->arch.local_int.lock);
5288fbf0 64
ade38c31
CH		 65 trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
66
5288fbf0 67 if (vcpu->arch.local_int.action_bits & ACTION_STOP_ON_STOP) {
6852d7b6 68 kvm_s390_vcpu_stop(vcpu);
5288fbf0
CB		 69 vcpu->arch.local_int.action_bits &= ~ACTION_STOP_ON_STOP;
70 VCPU_EVENT(vcpu, 3, "%s", "cpu stopped");
b8e660b8 71 rc = -EOPNOTSUPP;
9ace903d
CE		 72 }
73
9e0d5473
JF		 74 if (vcpu->arch.local_int.action_bits & ACTION_STORE_ON_STOP) {
75 vcpu->arch.local_int.action_bits &= ~ACTION_STORE_ON_STOP;
76 /* store status must be called unlocked. Since local_int.lock
77 * only protects local_int.* and not guest memory we can give
78 * up the lock here */
79 spin_unlock_bh(&vcpu->arch.local_int.lock);
80 rc = kvm_s390_vcpu_store_status(vcpu,
81 KVM_S390_STORE_STATUS_NOADDR);
82 if (rc >= 0)
83 rc = -EOPNOTSUPP;
84 } else
85 spin_unlock_bh(&vcpu->arch.local_int.lock);
5288fbf0 86 return rc;
8f2abe6a
CB		 87}
88
89static int handle_validity(struct kvm_vcpu *vcpu)
90{
91 int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9 92
8f2abe6a 93 vcpu->stat.exit_validity++;
5786fffa 94 trace_kvm_s390_intercept_validity(vcpu, viwhy);
2c70fe44
CB		 95 WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
96 return -EOPNOTSUPP;
8f2abe6a
CB		 97}
98
ba5c1e9b
CO		 99static int handle_instruction(struct kvm_vcpu *vcpu)
100{
101 intercept_handler_t handler;
102
103 vcpu->stat.exit_instruction++;
5786fffa
CH		 104 trace_kvm_s390_intercept_instruction(vcpu,
105 vcpu->arch.sie_block->ipa,
106 vcpu->arch.sie_block->ipb);
ba5c1e9b
CO		 107 handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
108 if (handler)
109 return handler(vcpu);
b8e660b8 110 return -EOPNOTSUPP;
ba5c1e9b
CO		 111}
112
439716a5
DH		 113static void __extract_prog_irq(struct kvm_vcpu *vcpu,
114 struct kvm_s390_pgm_info *pgm_info)
115{
116 memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
117 pgm_info->code = vcpu->arch.sie_block->iprcc;
118
119 switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
120 case PGM_AFX_TRANSLATION:
121 case PGM_ASX_TRANSLATION:
122 case PGM_EX_TRANSLATION:
123 case PGM_LFX_TRANSLATION:
124 case PGM_LSTE_SEQUENCE:
125 case PGM_LSX_TRANSLATION:
126 case PGM_LX_TRANSLATION:
127 case PGM_PRIMARY_AUTHORITY:
128 case PGM_SECONDARY_AUTHORITY:
129 case PGM_SPACE_SWITCH:
130 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
131 break;
132 case PGM_ALEN_TRANSLATION:
133 case PGM_ALE_SEQUENCE:
134 case PGM_ASTE_INSTANCE:
135 case PGM_ASTE_SEQUENCE:
136 case PGM_ASTE_VALIDITY:
137 case PGM_EXTENDED_AUTHORITY:
138 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
139 break;
140 case PGM_ASCE_TYPE:
141 case PGM_PAGE_TRANSLATION:
142 case PGM_REGION_FIRST_TRANS:
143 case PGM_REGION_SECOND_TRANS:
144 case PGM_REGION_THIRD_TRANS:
145 case PGM_SEGMENT_TRANSLATION:
146 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
147 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
148 pgm_info->op_access_id = vcpu->arch.sie_block->oai;
149 break;
150 case PGM_MONITOR:
151 pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
152 pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
153 break;
154 case PGM_DATA:
155 pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
156 break;
157 case PGM_PROTECTION:
158 pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
159 pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
160 break;
161 default:
162 break;
163 }
164
165 if (vcpu->arch.sie_block->iprcc & PGM_PER) {
166 pgm_info->per_code = vcpu->arch.sie_block->perc;
167 pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
168 pgm_info->per_address = vcpu->arch.sie_block->peraddr;
169 pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
170 }
171}
172
e325fe69
MM		 173/*
174 * restore ITDB to program-interruption TDB in guest lowcore
175 * and set TX abort indication if required
176*/
177static int handle_itdb(struct kvm_vcpu *vcpu)
178{
179 struct kvm_s390_itdb *itdb;
180 int rc;
181
182 if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
183 return 0;
184 if (current->thread.per_flags & PER_FLAG_NO_TE)
185 return 0;
186 itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
187 rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
188 if (rc)
189 return rc;
190 memset(itdb, 0, sizeof(*itdb));
191
192 return 0;
193}
194
27291e21
DH		 195#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
196
ba5c1e9b
CO		 197static int handle_prog(struct kvm_vcpu *vcpu)
198{
439716a5 199 struct kvm_s390_pgm_info pgm_info;
0040e7d2
HC		 200 int rc;
201
ba5c1e9b 202 vcpu->stat.exit_program_interruption++;
7feb6bb8 203
27291e21
DH		 204 if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
205 kvm_s390_handle_per_event(vcpu);
206 /* the interrupt might have been filtered out completely */
207 if (vcpu->arch.sie_block->iprcc == 0)
208 return 0;
209 }
210
e325fe69
MM		 211 trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
212
213 rc = handle_itdb(vcpu);
0040e7d2
HC		 214 if (rc)
215 return rc;
439716a5 216
e325fe69 217 __extract_prog_irq(vcpu, &pgm_info);
439716a5 218 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
ba5c1e9b
CO		 219}
220
221static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
222{
223 int rc, rc2;
224
225 vcpu->stat.exit_instr_and_program++;
226 rc = handle_instruction(vcpu);
227 rc2 = handle_prog(vcpu);
228
b8e660b8 229 if (rc == -EOPNOTSUPP)
ba5c1e9b
CO		 230 vcpu->arch.sie_block->icptcode = 0x04;
231 if (rc)
232 return rc;
233 return rc2;
234}
235
9a558ee3
TH		 236/**
237 * Handle MOVE PAGE partial execution interception.
238 *
239 * This interception can only happen for guests with DAT disabled and
240 * addresses that are currently not mapped in the host. Thus we try to
241 * set up the mappings for the corresponding user pages here (or throw
242 * addressing exceptions in case of illegal guest addresses).
243 */
244static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
245{
246 unsigned long hostaddr, srcaddr, dstaddr;
247 psw_t *psw = &vcpu->arch.sie_block->gpsw;
248 struct mm_struct *mm = current->mm;
249 int reg1, reg2, rc;
250
251 kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
252 srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
253 dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
254
255 /* Make sure that the source is paged-in */
256 hostaddr = gmap_fault(srcaddr, vcpu->arch.gmap);
257 if (IS_ERR_VALUE(hostaddr))
258 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
259 down_read(&mm->mmap_sem);
260 rc = get_user_pages(current, mm, hostaddr, 1, 0, 0, NULL, NULL);
261 up_read(&mm->mmap_sem);
262 if (rc < 0)
263 return rc;
264
265 /* Make sure that the destination is paged-in */
266 hostaddr = gmap_fault(dstaddr, vcpu->arch.gmap);
267 if (IS_ERR_VALUE(hostaddr))
268 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
269 down_read(&mm->mmap_sem);
270 rc = get_user_pages(current, mm, hostaddr, 1, 1, 0, NULL, NULL);
271 up_read(&mm->mmap_sem);
272 if (rc < 0)
273 return rc;
274
275 psw->addr = __rewind_psw(*psw, 4);
276
277 return 0;
278}
279
280static int handle_partial_execution(struct kvm_vcpu *vcpu)
281{
282 if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
283 return handle_mvpg_pei(vcpu);
284
285 return -EOPNOTSUPP;
286}
287
062d5e9b 288static const intercept_handler_t intercept_funcs[] = {
8f2abe6a 289 [0x00 >> 2] = handle_noop,
ba5c1e9b
CO		 290 [0x04 >> 2] = handle_instruction,
291 [0x08 >> 2] = handle_prog,
292 [0x0C >> 2] = handle_instruction_and_prog,
8f2abe6a
CB		 293 [0x10 >> 2] = handle_noop,
294 [0x14 >> 2] = handle_noop,
fa6b7fe9 295 [0x18 >> 2] = handle_noop,
ba5c1e9b 296 [0x1C >> 2] = kvm_s390_handle_wait,
8f2abe6a
CB		 297 [0x20 >> 2] = handle_validity,
298 [0x28 >> 2] = handle_stop,
9a558ee3 299 [0x38 >> 2] = handle_partial_execution,
8f2abe6a
CB		 300};
301
302int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
303{
304 intercept_handler_t func;
305 u8 code = vcpu->arch.sie_block->icptcode;
306
062d5e9b 307 if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
b8e660b8 308 return -EOPNOTSUPP;
8f2abe6a
CB		 309 func = intercept_funcs[code >> 2];
310 if (func)
311 return func(vcpu);
b8e660b8 312 return -EOPNOTSUPP;
8f2abe6a 313}
Linux kernel - Deliverables
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