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>
29 #include <asm/byteorder.h>
30 #include <asm/kvm_ppc.h>
31 #include <asm/disassemble.h>
38 #define OP_31_XOP_LWZX 23
39 #define OP_31_XOP_LBZX 87
40 #define OP_31_XOP_STWX 151
41 #define OP_31_XOP_STBX 215
42 #define OP_31_XOP_LBZUX 119
43 #define OP_31_XOP_STBUX 247
44 #define OP_31_XOP_LHZX 279
45 #define OP_31_XOP_LHZUX 311
46 #define OP_31_XOP_MFSPR 339
47 #define OP_31_XOP_LHAX 343
48 #define OP_31_XOP_STHX 407
49 #define OP_31_XOP_STHUX 439
50 #define OP_31_XOP_MTSPR 467
51 #define OP_31_XOP_DCBI 470
52 #define OP_31_XOP_LWBRX 534
53 #define OP_31_XOP_TLBSYNC 566
54 #define OP_31_XOP_STWBRX 662
55 #define OP_31_XOP_LHBRX 790
56 #define OP_31_XOP_STHBRX 918
73 void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
75 unsigned long dec_nsec;
76 unsigned long long dec_time;
78 pr_debug("mtDEC: %x\n", vcpu->arch.dec);
79 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
81 #ifdef CONFIG_PPC_BOOK3S
82 /* mtdec lowers the interrupt line when positive. */
83 kvmppc_core_dequeue_dec(vcpu);
85 /* POWER4+ triggers a dec interrupt if the value is < 0 */
86 if (vcpu->arch.dec & 0x80000000) {
87 kvmppc_core_queue_dec(vcpu);
93 /* On BOOKE, DEC = 0 is as good as decrementer not enabled */
94 if (vcpu->arch.dec == 0)
99 * The decrementer ticks at the same rate as the timebase, so
100 * that's how we convert the guest DEC value to the number of
104 dec_time = vcpu->arch.dec;
106 do_div(dec_time, tb_ticks_per_usec);
107 dec_nsec = do_div(dec_time, NSEC_PER_SEC);
108 hrtimer_start(&vcpu->arch.dec_timer,
109 ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
110 vcpu->arch.dec_jiffies = get_tb();
113 u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb)
115 u64 jd = tb - vcpu->arch.dec_jiffies;
118 if (vcpu->arch.dec < jd)
122 return vcpu->arch.dec - jd;
137 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
139 /* XXX Should probably auto-generate instruction decoding for a particular core
140 * from opcode tables in the future. */
141 int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
143 u32 inst = kvmppc_get_last_inst(vcpu);
150 enum emulation_result emulated = EMULATE_DONE;
153 /* this default type might be overwritten by subcategories */
154 kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
156 pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));
158 switch (get_op(inst)) {
160 #ifdef CONFIG_PPC_BOOK3S
162 kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
164 kvmppc_core_queue_program(vcpu,
165 vcpu->arch.shared->esr | ESR_PTR);
171 switch (get_xop(inst)) {
175 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
180 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
183 case OP_31_XOP_LBZUX:
188 ea = kvmppc_get_gpr(vcpu, rb);
190 ea += kvmppc_get_gpr(vcpu, ra);
192 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
193 kvmppc_set_gpr(vcpu, ra, ea);
198 emulated = kvmppc_handle_store(run, vcpu,
199 kvmppc_get_gpr(vcpu, rs),
205 emulated = kvmppc_handle_store(run, vcpu,
206 kvmppc_get_gpr(vcpu, rs),
210 case OP_31_XOP_STBUX:
215 ea = kvmppc_get_gpr(vcpu, rb);
217 ea += kvmppc_get_gpr(vcpu, ra);
219 emulated = kvmppc_handle_store(run, vcpu,
220 kvmppc_get_gpr(vcpu, rs),
222 kvmppc_set_gpr(vcpu, rs, ea);
227 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
232 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
235 case OP_31_XOP_LHZUX:
240 ea = kvmppc_get_gpr(vcpu, rb);
242 ea += kvmppc_get_gpr(vcpu, ra);
244 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
245 kvmppc_set_gpr(vcpu, ra, ea);
248 case OP_31_XOP_MFSPR:
249 sprn = get_sprn(inst);
254 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr0);
257 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr1);
260 kvmppc_set_gpr(vcpu, rt, vcpu->arch.pvr); break;
262 kvmppc_set_gpr(vcpu, rt, vcpu->vcpu_id); break;
264 kvmppc_set_gpr(vcpu, rt, 0); break;
266 /* Note: mftb and TBRL/TBWL are user-accessible, so
267 * the guest can always access the real TB anyways.
268 * In fact, we probably will never see these traps. */
270 kvmppc_set_gpr(vcpu, rt, get_tb() >> 32); break;
272 kvmppc_set_gpr(vcpu, rt, get_tb()); break;
275 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg0);
278 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg1);
281 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg2);
284 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg3);
286 /* Note: SPRG4-7 are user-readable, so we don't get
291 kvmppc_set_gpr(vcpu, rt,
292 kvmppc_get_dec(vcpu, get_tb()));
296 emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt);
297 if (emulated == EMULATE_FAIL) {
298 printk("mfspr: unknown spr %x\n", sprn);
299 kvmppc_set_gpr(vcpu, rt, 0);
303 kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);
311 emulated = kvmppc_handle_store(run, vcpu,
312 kvmppc_get_gpr(vcpu, rs),
316 case OP_31_XOP_STHUX:
321 ea = kvmppc_get_gpr(vcpu, rb);
323 ea += kvmppc_get_gpr(vcpu, ra);
325 emulated = kvmppc_handle_store(run, vcpu,
326 kvmppc_get_gpr(vcpu, rs),
328 kvmppc_set_gpr(vcpu, ra, ea);
331 case OP_31_XOP_MTSPR:
332 sprn = get_sprn(inst);
336 vcpu->arch.shared->srr0 = kvmppc_get_gpr(vcpu, rs);
339 vcpu->arch.shared->srr1 = kvmppc_get_gpr(vcpu, rs);
342 /* XXX We need to context-switch the timebase for
343 * watchdog and FIT. */
344 case SPRN_TBWL: break;
345 case SPRN_TBWU: break;
347 case SPRN_MSSSR0: break;
350 vcpu->arch.dec = kvmppc_get_gpr(vcpu, rs);
351 kvmppc_emulate_dec(vcpu);
355 vcpu->arch.shared->sprg0 = kvmppc_get_gpr(vcpu, rs);
358 vcpu->arch.shared->sprg1 = kvmppc_get_gpr(vcpu, rs);
361 vcpu->arch.shared->sprg2 = kvmppc_get_gpr(vcpu, rs);
364 vcpu->arch.shared->sprg3 = kvmppc_get_gpr(vcpu, rs);
368 emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);
369 if (emulated == EMULATE_FAIL)
370 printk("mtspr: unknown spr %x\n", sprn);
373 kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
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:
386 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
389 case OP_31_XOP_TLBSYNC:
392 case OP_31_XOP_STWBRX:
397 emulated = kvmppc_handle_store(run, vcpu,
398 kvmppc_get_gpr(vcpu, rs),
402 case OP_31_XOP_LHBRX:
404 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
407 case OP_31_XOP_STHBRX:
412 emulated = kvmppc_handle_store(run, vcpu,
413 kvmppc_get_gpr(vcpu, rs),
418 /* Attempt core-specific emulation below. */
419 emulated = EMULATE_FAIL;
425 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
431 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
432 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
437 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
443 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
444 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
449 emulated = kvmppc_handle_store(run, vcpu,
450 kvmppc_get_gpr(vcpu, rs),
457 emulated = kvmppc_handle_store(run, vcpu,
458 kvmppc_get_gpr(vcpu, rs),
460 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
465 emulated = kvmppc_handle_store(run, vcpu,
466 kvmppc_get_gpr(vcpu, rs),
473 emulated = kvmppc_handle_store(run, vcpu,
474 kvmppc_get_gpr(vcpu, rs),
476 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
481 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
487 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
488 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
493 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
499 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
500 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
505 emulated = kvmppc_handle_store(run, vcpu,
506 kvmppc_get_gpr(vcpu, rs),
513 emulated = kvmppc_handle_store(run, vcpu,
514 kvmppc_get_gpr(vcpu, rs),
516 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
520 emulated = EMULATE_FAIL;
523 if (emulated == EMULATE_FAIL) {
524 emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
525 if (emulated == EMULATE_AGAIN) {
527 } else if (emulated == EMULATE_FAIL) {
529 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
530 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
531 kvmppc_core_queue_program(vcpu, 0);
535 trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
537 /* Advance past emulated instruction. */
539 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);