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Hollis Blanchardbbf45ba2008-04-16 23:28:09 -05001/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License, version 2, as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
14 *
15 * Copyright IBM Corp. 2007
Scott Wooddfd4d472011-11-17 12:39:59 +000016 * Copyright 2011 Freescale Semiconductor, Inc.
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050017 *
18 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
19 */
20
21#include <linux/jiffies.h>
Alexander Graf544c6762009-11-02 12:02:31 +000022#include <linux/hrtimer.h>
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050023#include <linux/types.h>
24#include <linux/string.h>
25#include <linux/kvm_host.h>
Bharat Bhushan6e359942012-04-18 06:01:19 +000026#include <linux/clockchips.h>
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050027
Hollis Blanchard75f74f02008-11-05 09:36:16 -060028#include <asm/reg.h>
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050029#include <asm/time.h>
30#include <asm/byteorder.h>
31#include <asm/kvm_ppc.h>
Hollis Blanchardc381a042008-11-05 09:36:15 -060032#include <asm/disassemble.h>
Hongtao Jia9123c5e2013-04-28 13:20:07 +080033#include <asm/ppc-opcode.h>
Hollis Blanchard73e75b42008-12-02 15:51:57 -060034#include "timing.h"
Marcelo Tosatti46f43c62009-06-18 11:47:27 -030035#include "trace.h"
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050036
Hollis Blanchard75f74f02008-11-05 09:36:16 -060037void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050038{
Alexander Graf544c6762009-11-02 12:02:31 +000039 unsigned long dec_nsec;
Bharat Bhushandc2babfe2011-10-19 09:46:06 +053040 unsigned long long dec_time;
Alexander Graf9a7a9b02009-10-30 05:47:15 +000041
Alexander Graf544c6762009-11-02 12:02:31 +000042 pr_debug("mtDEC: %x\n", vcpu->arch.dec);
Scott Wooddfd4d472011-11-17 12:39:59 +000043 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
44
Alexander Graf00c3a372010-04-16 00:11:42 +020045#ifdef CONFIG_PPC_BOOK3S
Alexander Graf7706664d2009-12-21 20:21:24 +010046 /* mtdec lowers the interrupt line when positive. */
47 kvmppc_core_dequeue_dec(vcpu);
48
Alexander Graf513579e2009-10-30 05:47:16 +000049 /* POWER4+ triggers a dec interrupt if the value is < 0 */
50 if (vcpu->arch.dec & 0x80000000) {
Alexander Graf513579e2009-10-30 05:47:16 +000051 kvmppc_core_queue_dec(vcpu);
52 return;
53 }
54#endif
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050055
Scott Wooddfd4d472011-11-17 12:39:59 +000056#ifdef CONFIG_BOOKE
57 /* On BOOKE, DEC = 0 is as good as decrementer not enabled */
58 if (vcpu->arch.dec == 0)
59 return;
60#endif
61
62 /*
63 * The decrementer ticks at the same rate as the timebase, so
64 * that's how we convert the guest DEC value to the number of
65 * host ticks.
66 */
67
68 dec_time = vcpu->arch.dec;
Bharat Bhushan6e359942012-04-18 06:01:19 +000069 /*
70 * Guest timebase ticks at the same frequency as host decrementer.
71 * So use the host decrementer calculations for decrementer emulation.
72 */
73 dec_time = dec_time << decrementer_clockevent.shift;
74 do_div(dec_time, decrementer_clockevent.mult);
Scott Wooddfd4d472011-11-17 12:39:59 +000075 dec_nsec = do_div(dec_time, NSEC_PER_SEC);
76 hrtimer_start(&vcpu->arch.dec_timer,
77 ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
78 vcpu->arch.dec_jiffies = get_tb();
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -050079}
80
Scott Wood5ce941e2011-04-27 17:24:21 -050081u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb)
82{
83 u64 jd = tb - vcpu->arch.dec_jiffies;
Scott Wooddfd4d472011-11-17 12:39:59 +000084
85#ifdef CONFIG_BOOKE
86 if (vcpu->arch.dec < jd)
87 return 0;
88#endif
89
Scott Wood5ce941e2011-04-27 17:24:21 -050090 return vcpu->arch.dec - jd;
91}
92
Alexander Graf388cf9e2012-10-06 23:19:01 +020093static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
94{
95 enum emulation_result emulated = EMULATE_DONE;
96 ulong spr_val = kvmppc_get_gpr(vcpu, rs);
97
98 switch (sprn) {
99 case SPRN_SRR0:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200100 kvmppc_set_srr0(vcpu, spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200101 break;
102 case SPRN_SRR1:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200103 kvmppc_set_srr1(vcpu, spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200104 break;
105
106 /* XXX We need to context-switch the timebase for
107 * watchdog and FIT. */
108 case SPRN_TBWL: break;
109 case SPRN_TBWU: break;
110
Alexander Graf388cf9e2012-10-06 23:19:01 +0200111 case SPRN_DEC:
112 vcpu->arch.dec = spr_val;
113 kvmppc_emulate_dec(vcpu);
114 break;
115
116 case SPRN_SPRG0:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200117 kvmppc_set_sprg0(vcpu, spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200118 break;
119 case SPRN_SPRG1:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200120 kvmppc_set_sprg1(vcpu, spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200121 break;
122 case SPRN_SPRG2:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200123 kvmppc_set_sprg2(vcpu, spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200124 break;
125 case SPRN_SPRG3:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200126 kvmppc_set_sprg3(vcpu, spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200127 break;
128
Alexander Grafa3ff5fb2013-06-27 01:07:15 +0200129 /* PIR can legally be written, but we ignore it */
130 case SPRN_PIR: break;
131
Alexander Graf388cf9e2012-10-06 23:19:01 +0200132 default:
Aneesh Kumar K.Vcbbc58d2013-10-07 22:18:01 +0530133 emulated = vcpu->kvm->arch.kvm_ops->emulate_mtspr(vcpu, sprn,
134 spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200135 if (emulated == EMULATE_FAIL)
136 printk(KERN_INFO "mtspr: unknown spr "
137 "0x%x\n", sprn);
138 break;
139 }
140
141 kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
142
143 return emulated;
144}
145
146static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
147{
148 enum emulation_result emulated = EMULATE_DONE;
149 ulong spr_val = 0;
150
151 switch (sprn) {
152 case SPRN_SRR0:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200153 spr_val = kvmppc_get_srr0(vcpu);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200154 break;
155 case SPRN_SRR1:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200156 spr_val = kvmppc_get_srr1(vcpu);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200157 break;
158 case SPRN_PVR:
159 spr_val = vcpu->arch.pvr;
160 break;
161 case SPRN_PIR:
162 spr_val = vcpu->vcpu_id;
163 break;
Alexander Graf388cf9e2012-10-06 23:19:01 +0200164
165 /* Note: mftb and TBRL/TBWL are user-accessible, so
166 * the guest can always access the real TB anyways.
167 * In fact, we probably will never see these traps. */
168 case SPRN_TBWL:
169 spr_val = get_tb() >> 32;
170 break;
171 case SPRN_TBWU:
172 spr_val = get_tb();
173 break;
174
175 case SPRN_SPRG0:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200176 spr_val = kvmppc_get_sprg0(vcpu);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200177 break;
178 case SPRN_SPRG1:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200179 spr_val = kvmppc_get_sprg1(vcpu);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200180 break;
181 case SPRN_SPRG2:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200182 spr_val = kvmppc_get_sprg2(vcpu);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200183 break;
184 case SPRN_SPRG3:
Alexander Graf5deb8e72014-04-24 13:46:24 +0200185 spr_val = kvmppc_get_sprg3(vcpu);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200186 break;
187 /* Note: SPRG4-7 are user-readable, so we don't get
188 * a trap. */
189
190 case SPRN_DEC:
191 spr_val = kvmppc_get_dec(vcpu, get_tb());
192 break;
193 default:
Aneesh Kumar K.Vcbbc58d2013-10-07 22:18:01 +0530194 emulated = vcpu->kvm->arch.kvm_ops->emulate_mfspr(vcpu, sprn,
195 &spr_val);
Alexander Graf388cf9e2012-10-06 23:19:01 +0200196 if (unlikely(emulated == EMULATE_FAIL)) {
197 printk(KERN_INFO "mfspr: unknown spr "
198 "0x%x\n", sprn);
199 }
200 break;
201 }
202
203 if (emulated == EMULATE_DONE)
204 kvmppc_set_gpr(vcpu, rt, spr_val);
205 kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);
206
207 return emulated;
208}
209
Hollis Blanchard75f74f02008-11-05 09:36:16 -0600210/* XXX Should probably auto-generate instruction decoding for a particular core
211 * from opcode tables in the future. */
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500212int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
213{
Mihai Caraman51f04722014-07-23 19:06:21 +0300214 u32 inst;
Alexander Grafd69614a2014-06-18 14:53:49 +0200215 int rs, rt, sprn;
Mihai Caraman51f04722014-07-23 19:06:21 +0300216 enum emulation_result emulated;
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500217 int advance = 1;
218
Hollis Blanchard73e75b42008-12-02 15:51:57 -0600219 /* this default type might be overwritten by subcategories */
220 kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
221
Alexander Graf8d0eff62014-09-10 14:37:29 +0200222 emulated = kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst);
Mihai Caraman51f04722014-07-23 19:06:21 +0300223 if (emulated != EMULATE_DONE)
224 return emulated;
225
Joe Perches689fd142010-09-11 19:10:53 +0000226 pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));
Alexander Graf513579e2009-10-30 05:47:16 +0000227
Mihai Caraman51f04722014-07-23 19:06:21 +0300228 rs = get_rs(inst);
229 rt = get_rt(inst);
230 sprn = get_sprn(inst);
231
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500232 switch (get_op(inst)) {
Hollis Blanchardcea5d8c2009-01-03 16:23:05 -0600233 case OP_TRAP:
Alexander Graf00c3a372010-04-16 00:11:42 +0200234#ifdef CONFIG_PPC_BOOK3S
Alexander Graf513579e2009-10-30 05:47:16 +0000235 case OP_TRAP_64:
Alexander Graf25a8a022010-01-08 02:58:07 +0100236 kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
Liu Yudaf5e272010-02-02 19:44:35 +0800237#else
Scott Woodb5904972011-11-08 18:23:30 -0600238 kvmppc_core_queue_program(vcpu,
239 vcpu->arch.shared->esr | ESR_PTR);
Liu Yudaf5e272010-02-02 19:44:35 +0800240#endif
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500241 advance = 0;
242 break;
243
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500244 case 31:
245 switch (get_xop(inst)) {
246
Alexander Graf6df79df2012-03-13 22:15:45 +0100247 case OP_31_XOP_TRAP:
248#ifdef CONFIG_64BIT
249 case OP_31_XOP_TRAP_64:
250#endif
251#ifdef CONFIG_PPC_BOOK3S
252 kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
253#else
254 kvmppc_core_queue_program(vcpu,
255 vcpu->arch.shared->esr | ESR_PTR);
256#endif
257 advance = 0;
258 break;
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500259
Hollis Blanchardcea5d8c2009-01-03 16:23:05 -0600260 case OP_31_XOP_MFSPR:
Alexander Graf388cf9e2012-10-06 23:19:01 +0200261 emulated = kvmppc_emulate_mfspr(vcpu, sprn, rt);
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500262 break;
263
Hollis Blanchardcea5d8c2009-01-03 16:23:05 -0600264 case OP_31_XOP_MTSPR:
Alexander Graf388cf9e2012-10-06 23:19:01 +0200265 emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs);
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500266 break;
267
Hollis Blanchardcea5d8c2009-01-03 16:23:05 -0600268 case OP_31_XOP_TLBSYNC:
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500269 break;
270
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500271 default:
Hollis Blanchard75f74f02008-11-05 09:36:16 -0600272 /* Attempt core-specific emulation below. */
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500273 emulated = EMULATE_FAIL;
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500274 }
275 break;
276
Madhavan Srinivasana59c1d92014-09-09 22:37:35 +0530277 case 0:
278 /*
279 * Instruction with primary opcode 0. Based on PowerISA
280 * these are illegal instructions.
281 */
282 if (inst == KVMPPC_INST_SW_BREAKPOINT) {
283 run->exit_reason = KVM_EXIT_DEBUG;
284 run->debug.arch.address = kvmppc_get_pc(vcpu);
285 emulated = EMULATE_EXIT_USER;
286 advance = 0;
287 } else
288 emulated = EMULATE_FAIL;
289
290 break;
291
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500292 default:
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500293 emulated = EMULATE_FAIL;
Hollis Blanchard75f74f02008-11-05 09:36:16 -0600294 }
295
296 if (emulated == EMULATE_FAIL) {
Aneesh Kumar K.Vcbbc58d2013-10-07 22:18:01 +0530297 emulated = vcpu->kvm->arch.kvm_ops->emulate_op(run, vcpu, inst,
298 &advance);
Alexander Graf37f5bca2010-02-19 11:00:31 +0100299 if (emulated == EMULATE_AGAIN) {
300 advance = 0;
301 } else if (emulated == EMULATE_FAIL) {
Hollis Blanchard75f74f02008-11-05 09:36:16 -0600302 advance = 0;
303 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
304 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
305 }
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500306 }
307
Alexander Grafc7f38f42010-04-16 00:11:40 +0200308 trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
Christian Ehrhardt3b4bd792008-07-14 14:00:04 +0200309
Alexander Grafc7f38f42010-04-16 00:11:40 +0200310 /* Advance past emulated instruction. */
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500311 if (advance)
Alexander Grafc7f38f42010-04-16 00:11:40 +0200312 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
Hollis Blanchardbbf45ba2008-04-16 23:28:09 -0500313
314 return emulated;
315}
Aneesh Kumar K.V2ba9f0d2013-10-07 22:17:59 +0530316EXPORT_SYMBOL_GPL(kvmppc_emulate_instruction);