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.
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.
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.
15 * Copyright IBM Corp. 2007
16 * Copyright 2011 Freescale Semiconductor, Inc.
18 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
21 #include <linux/jiffies.h>
22 #include <linux/hrtimer.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kvm_host.h>
26 #include <linux/clockchips.h>
30 #include <asm/byteorder.h>
31 #include <asm/kvm_ppc.h>
32 #include <asm/disassemble.h>
39 #define OP_31_XOP_TRAP 4
40 #define OP_31_XOP_LWZX 23
41 #define OP_31_XOP_DCBST 54
42 #define OP_31_XOP_TRAP_64 68
43 #define OP_31_XOP_DCBF 86
44 #define OP_31_XOP_LBZX 87
45 #define OP_31_XOP_STWX 151
46 #define OP_31_XOP_STBX 215
47 #define OP_31_XOP_LBZUX 119
48 #define OP_31_XOP_STBUX 247
49 #define OP_31_XOP_LHZX 279
50 #define OP_31_XOP_LHZUX 311
51 #define OP_31_XOP_MFSPR 339
52 #define OP_31_XOP_LHAX 343
53 #define OP_31_XOP_STHX 407
54 #define OP_31_XOP_STHUX 439
55 #define OP_31_XOP_MTSPR 467
56 #define OP_31_XOP_DCBI 470
57 #define OP_31_XOP_LWBRX 534
58 #define OP_31_XOP_TLBSYNC 566
59 #define OP_31_XOP_STWBRX 662
60 #define OP_31_XOP_LHBRX 790
61 #define OP_31_XOP_STHBRX 918
80 void kvmppc_emulate_dec(struct kvm_vcpu
*vcpu
)
82 unsigned long dec_nsec
;
83 unsigned long long dec_time
;
85 pr_debug("mtDEC: %x\n", vcpu
->arch
.dec
);
86 hrtimer_try_to_cancel(&vcpu
->arch
.dec_timer
);
88 #ifdef CONFIG_PPC_BOOK3S
89 /* mtdec lowers the interrupt line when positive. */
90 kvmppc_core_dequeue_dec(vcpu
);
92 /* POWER4+ triggers a dec interrupt if the value is < 0 */
93 if (vcpu
->arch
.dec
& 0x80000000) {
94 kvmppc_core_queue_dec(vcpu
);
100 /* On BOOKE, DEC = 0 is as good as decrementer not enabled */
101 if (vcpu
->arch
.dec
== 0)
106 * The decrementer ticks at the same rate as the timebase, so
107 * that's how we convert the guest DEC value to the number of
111 dec_time
= vcpu
->arch
.dec
;
113 * Guest timebase ticks at the same frequency as host decrementer.
114 * So use the host decrementer calculations for decrementer emulation.
116 dec_time
= dec_time
<< decrementer_clockevent
.shift
;
117 do_div(dec_time
, decrementer_clockevent
.mult
);
118 dec_nsec
= do_div(dec_time
, NSEC_PER_SEC
);
119 hrtimer_start(&vcpu
->arch
.dec_timer
,
120 ktime_set(dec_time
, dec_nsec
), HRTIMER_MODE_REL
);
121 vcpu
->arch
.dec_jiffies
= get_tb();
124 u32
kvmppc_get_dec(struct kvm_vcpu
*vcpu
, u64 tb
)
126 u64 jd
= tb
- vcpu
->arch
.dec_jiffies
;
129 if (vcpu
->arch
.dec
< jd
)
133 return vcpu
->arch
.dec
- jd
;
136 static int kvmppc_emulate_mtspr(struct kvm_vcpu
*vcpu
, int sprn
, int rs
)
138 enum emulation_result emulated
= EMULATE_DONE
;
139 ulong spr_val
= kvmppc_get_gpr(vcpu
, rs
);
143 vcpu
->arch
.shared
->srr0
= spr_val
;
146 vcpu
->arch
.shared
->srr1
= spr_val
;
149 /* XXX We need to context-switch the timebase for
150 * watchdog and FIT. */
151 case SPRN_TBWL
: break;
152 case SPRN_TBWU
: break;
155 vcpu
->arch
.dec
= spr_val
;
156 kvmppc_emulate_dec(vcpu
);
160 vcpu
->arch
.shared
->sprg0
= spr_val
;
163 vcpu
->arch
.shared
->sprg1
= spr_val
;
166 vcpu
->arch
.shared
->sprg2
= spr_val
;
169 vcpu
->arch
.shared
->sprg3
= spr_val
;
173 emulated
= kvmppc_core_emulate_mtspr(vcpu
, sprn
,
175 if (emulated
== EMULATE_FAIL
)
176 printk(KERN_INFO
"mtspr: unknown spr "
181 kvmppc_set_exit_type(vcpu
, EMULATED_MTSPR_EXITS
);
186 static int kvmppc_emulate_mfspr(struct kvm_vcpu
*vcpu
, int sprn
, int rt
)
188 enum emulation_result emulated
= EMULATE_DONE
;
193 spr_val
= vcpu
->arch
.shared
->srr0
;
196 spr_val
= vcpu
->arch
.shared
->srr1
;
199 spr_val
= vcpu
->arch
.pvr
;
202 spr_val
= vcpu
->vcpu_id
;
205 /* Note: mftb and TBRL/TBWL are user-accessible, so
206 * the guest can always access the real TB anyways.
207 * In fact, we probably will never see these traps. */
209 spr_val
= get_tb() >> 32;
216 spr_val
= vcpu
->arch
.shared
->sprg0
;
219 spr_val
= vcpu
->arch
.shared
->sprg1
;
222 spr_val
= vcpu
->arch
.shared
->sprg2
;
225 spr_val
= vcpu
->arch
.shared
->sprg3
;
227 /* Note: SPRG4-7 are user-readable, so we don't get
231 spr_val
= kvmppc_get_dec(vcpu
, get_tb());
234 emulated
= kvmppc_core_emulate_mfspr(vcpu
, sprn
,
236 if (unlikely(emulated
== EMULATE_FAIL
)) {
237 printk(KERN_INFO
"mfspr: unknown spr "
243 if (emulated
== EMULATE_DONE
)
244 kvmppc_set_gpr(vcpu
, rt
, spr_val
);
245 kvmppc_set_exit_type(vcpu
, EMULATED_MFSPR_EXITS
);
262 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
264 /* XXX Should probably auto-generate instruction decoding for a particular core
265 * from opcode tables in the future. */
266 int kvmppc_emulate_instruction(struct kvm_run
*run
, struct kvm_vcpu
*vcpu
)
268 u32 inst
= kvmppc_get_last_inst(vcpu
);
269 int ra
= get_ra(inst
);
270 int rs
= get_rs(inst
);
271 int rt
= get_rt(inst
);
272 int sprn
= get_sprn(inst
);
273 enum emulation_result emulated
= EMULATE_DONE
;
276 /* this default type might be overwritten by subcategories */
277 kvmppc_set_exit_type(vcpu
, EMULATED_INST_EXITS
);
279 pr_debug("Emulating opcode %d / %d\n", get_op(inst
), get_xop(inst
));
281 switch (get_op(inst
)) {
283 #ifdef CONFIG_PPC_BOOK3S
285 kvmppc_core_queue_program(vcpu
, SRR1_PROGTRAP
);
287 kvmppc_core_queue_program(vcpu
,
288 vcpu
->arch
.shared
->esr
| ESR_PTR
);
294 switch (get_xop(inst
)) {
298 case OP_31_XOP_TRAP_64
:
300 #ifdef CONFIG_PPC_BOOK3S
301 kvmppc_core_queue_program(vcpu
, SRR1_PROGTRAP
);
303 kvmppc_core_queue_program(vcpu
,
304 vcpu
->arch
.shared
->esr
| ESR_PTR
);
309 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 4, 1);
313 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 1, 1);
316 case OP_31_XOP_LBZUX
:
317 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 1, 1);
318 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
322 emulated
= kvmppc_handle_store(run
, vcpu
,
323 kvmppc_get_gpr(vcpu
, rs
),
328 emulated
= kvmppc_handle_store(run
, vcpu
,
329 kvmppc_get_gpr(vcpu
, rs
),
333 case OP_31_XOP_STBUX
:
334 emulated
= kvmppc_handle_store(run
, vcpu
,
335 kvmppc_get_gpr(vcpu
, rs
),
337 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
341 emulated
= kvmppc_handle_loads(run
, vcpu
, rt
, 2, 1);
345 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 2, 1);
348 case OP_31_XOP_LHZUX
:
349 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 2, 1);
350 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
353 case OP_31_XOP_MFSPR
:
354 emulated
= kvmppc_emulate_mfspr(vcpu
, sprn
, rt
);
358 emulated
= kvmppc_handle_store(run
, vcpu
,
359 kvmppc_get_gpr(vcpu
, rs
),
363 case OP_31_XOP_STHUX
:
364 emulated
= kvmppc_handle_store(run
, vcpu
,
365 kvmppc_get_gpr(vcpu
, rs
),
367 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
370 case OP_31_XOP_MTSPR
:
371 emulated
= kvmppc_emulate_mtspr(vcpu
, sprn
, rs
);
374 case OP_31_XOP_DCBST
:
377 /* Do nothing. The guest is performing dcbi because
378 * hardware DMA is not snooped by the dcache, but
379 * emulated DMA either goes through the dcache as
380 * normal writes, or the host kernel has handled dcache
384 case OP_31_XOP_LWBRX
:
385 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 4, 0);
388 case OP_31_XOP_TLBSYNC
:
391 case OP_31_XOP_STWBRX
:
392 emulated
= kvmppc_handle_store(run
, vcpu
,
393 kvmppc_get_gpr(vcpu
, rs
),
397 case OP_31_XOP_LHBRX
:
398 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 2, 0);
401 case OP_31_XOP_STHBRX
:
402 emulated
= kvmppc_handle_store(run
, vcpu
,
403 kvmppc_get_gpr(vcpu
, rs
),
408 /* Attempt core-specific emulation below. */
409 emulated
= EMULATE_FAIL
;
414 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 4, 1);
417 /* TBD: Add support for other 64 bit load variants like ldu, ldux, ldx etc. */
420 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 8, 1);
424 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 4, 1);
425 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
429 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 1, 1);
433 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 1, 1);
434 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
438 emulated
= kvmppc_handle_store(run
, vcpu
,
439 kvmppc_get_gpr(vcpu
, rs
),
443 /* TBD: Add support for other 64 bit store variants like stdu, stdux, stdx etc. */
446 emulated
= kvmppc_handle_store(run
, vcpu
,
447 kvmppc_get_gpr(vcpu
, rs
),
452 emulated
= kvmppc_handle_store(run
, vcpu
,
453 kvmppc_get_gpr(vcpu
, rs
),
455 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
459 emulated
= kvmppc_handle_store(run
, vcpu
,
460 kvmppc_get_gpr(vcpu
, rs
),
465 emulated
= kvmppc_handle_store(run
, vcpu
,
466 kvmppc_get_gpr(vcpu
, rs
),
468 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
472 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 2, 1);
476 emulated
= kvmppc_handle_load(run
, vcpu
, rt
, 2, 1);
477 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
481 emulated
= kvmppc_handle_loads(run
, vcpu
, rt
, 2, 1);
485 emulated
= kvmppc_handle_loads(run
, vcpu
, rt
, 2, 1);
486 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
490 emulated
= kvmppc_handle_store(run
, vcpu
,
491 kvmppc_get_gpr(vcpu
, rs
),
496 emulated
= kvmppc_handle_store(run
, vcpu
,
497 kvmppc_get_gpr(vcpu
, rs
),
499 kvmppc_set_gpr(vcpu
, ra
, vcpu
->arch
.vaddr_accessed
);
503 emulated
= EMULATE_FAIL
;
506 if (emulated
== EMULATE_FAIL
) {
507 emulated
= kvmppc_core_emulate_op(run
, vcpu
, inst
, &advance
);
508 if (emulated
== EMULATE_AGAIN
) {
510 } else if (emulated
== EMULATE_FAIL
) {
512 printk(KERN_ERR
"Couldn't emulate instruction 0x%08x "
513 "(op %d xop %d)\n", inst
, get_op(inst
), get_xop(inst
));
517 trace_kvm_ppc_instr(inst
, kvmppc_get_pc(vcpu
), emulated
);
519 /* Advance past emulated instruction. */
521 kvmppc_set_pc(vcpu
, kvmppc_get_pc(vcpu
) + 4);