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_TRAP_64 68
42 #define OP_31_XOP_LBZX 87
43 #define OP_31_XOP_STWX 151
44 #define OP_31_XOP_STBX 215
45 #define OP_31_XOP_LBZUX 119
46 #define OP_31_XOP_STBUX 247
47 #define OP_31_XOP_LHZX 279
48 #define OP_31_XOP_LHZUX 311
49 #define OP_31_XOP_MFSPR 339
50 #define OP_31_XOP_LHAX 343
51 #define OP_31_XOP_STHX 407
52 #define OP_31_XOP_STHUX 439
53 #define OP_31_XOP_MTSPR 467
54 #define OP_31_XOP_DCBI 470
55 #define OP_31_XOP_LWBRX 534
56 #define OP_31_XOP_TLBSYNC 566
57 #define OP_31_XOP_STWBRX 662
58 #define OP_31_XOP_LHBRX 790
59 #define OP_31_XOP_STHBRX 918
78 void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
80 unsigned long dec_nsec;
81 unsigned long long dec_time;
83 pr_debug("mtDEC: %x\n", vcpu->arch.dec);
84 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
86 #ifdef CONFIG_PPC_BOOK3S
87 /* mtdec lowers the interrupt line when positive. */
88 kvmppc_core_dequeue_dec(vcpu);
90 /* POWER4+ triggers a dec interrupt if the value is < 0 */
91 if (vcpu->arch.dec & 0x80000000) {
92 kvmppc_core_queue_dec(vcpu);
98 /* On BOOKE, DEC = 0 is as good as decrementer not enabled */
99 if (vcpu->arch.dec == 0)
104 * The decrementer ticks at the same rate as the timebase, so
105 * that's how we convert the guest DEC value to the number of
109 dec_time = vcpu->arch.dec;
111 * Guest timebase ticks at the same frequency as host decrementer.
112 * So use the host decrementer calculations for decrementer emulation.
114 dec_time = dec_time << decrementer_clockevent.shift;
115 do_div(dec_time, decrementer_clockevent.mult);
116 dec_nsec = do_div(dec_time, NSEC_PER_SEC);
117 hrtimer_start(&vcpu->arch.dec_timer,
118 ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
119 vcpu->arch.dec_jiffies = get_tb();
122 u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb)
124 u64 jd = tb - vcpu->arch.dec_jiffies;
127 if (vcpu->arch.dec < jd)
131 return vcpu->arch.dec - jd;
134 static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
136 enum emulation_result emulated = EMULATE_DONE;
137 ulong spr_val = kvmppc_get_gpr(vcpu, rs);
141 vcpu->arch.shared->srr0 = spr_val;
144 vcpu->arch.shared->srr1 = spr_val;
147 /* XXX We need to context-switch the timebase for
148 * watchdog and FIT. */
149 case SPRN_TBWL: break;
150 case SPRN_TBWU: break;
152 case SPRN_MSSSR0: 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;
208 /* Note: mftb and TBRL/TBWL are user-accessible, so
209 * the guest can always access the real TB anyways.
210 * In fact, we probably will never see these traps. */
212 spr_val = get_tb() >> 32;
219 spr_val = vcpu->arch.shared->sprg0;
222 spr_val = vcpu->arch.shared->sprg1;
225 spr_val = vcpu->arch.shared->sprg2;
228 spr_val = vcpu->arch.shared->sprg3;
230 /* Note: SPRG4-7 are user-readable, so we don't get
234 spr_val = kvmppc_get_dec(vcpu, get_tb());
237 emulated = kvmppc_core_emulate_mfspr(vcpu, sprn,
239 if (unlikely(emulated == EMULATE_FAIL)) {
240 printk(KERN_INFO "mfspr: unknown spr "
246 if (emulated == EMULATE_DONE)
247 kvmppc_set_gpr(vcpu, rt, spr_val);
248 kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);
265 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
267 /* XXX Should probably auto-generate instruction decoding for a particular core
268 * from opcode tables in the future. */
269 int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
271 u32 inst = kvmppc_get_last_inst(vcpu);
272 int ra = get_ra(inst);
273 int rs = get_rs(inst);
274 int rt = get_rt(inst);
275 int sprn = get_sprn(inst);
276 enum emulation_result emulated = EMULATE_DONE;
279 /* this default type might be overwritten by subcategories */
280 kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
282 pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));
284 switch (get_op(inst)) {
286 #ifdef CONFIG_PPC_BOOK3S
288 kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
290 kvmppc_core_queue_program(vcpu,
291 vcpu->arch.shared->esr | ESR_PTR);
297 switch (get_xop(inst)) {
301 case OP_31_XOP_TRAP_64:
303 #ifdef CONFIG_PPC_BOOK3S
304 kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
306 kvmppc_core_queue_program(vcpu,
307 vcpu->arch.shared->esr | ESR_PTR);
312 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
316 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
319 case OP_31_XOP_LBZUX:
320 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
321 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
325 emulated = kvmppc_handle_store(run, vcpu,
326 kvmppc_get_gpr(vcpu, rs),
331 emulated = kvmppc_handle_store(run, vcpu,
332 kvmppc_get_gpr(vcpu, rs),
336 case OP_31_XOP_STBUX:
337 emulated = kvmppc_handle_store(run, vcpu,
338 kvmppc_get_gpr(vcpu, rs),
340 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
344 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
348 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
351 case OP_31_XOP_LHZUX:
352 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
353 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
356 case OP_31_XOP_MFSPR:
357 emulated = kvmppc_emulate_mfspr(vcpu, sprn, rt);
361 emulated = kvmppc_handle_store(run, vcpu,
362 kvmppc_get_gpr(vcpu, rs),
366 case OP_31_XOP_STHUX:
367 emulated = kvmppc_handle_store(run, vcpu,
368 kvmppc_get_gpr(vcpu, rs),
370 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
373 case OP_31_XOP_MTSPR:
374 emulated = kvmppc_emulate_mtspr(vcpu, sprn, rs);
378 /* Do nothing. The guest is performing dcbi because
379 * hardware DMA is not snooped by the dcache, but
380 * emulated DMA either goes through the dcache as
381 * normal writes, or the host kernel has handled dcache
385 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:
393 emulated = kvmppc_handle_store(run, vcpu,
394 kvmppc_get_gpr(vcpu, rs),
398 case OP_31_XOP_LHBRX:
399 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
402 case OP_31_XOP_STHBRX:
403 emulated = kvmppc_handle_store(run, vcpu,
404 kvmppc_get_gpr(vcpu, rs),
409 /* Attempt core-specific emulation below. */
410 emulated = EMULATE_FAIL;
415 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
418 /* TBD: Add support for other 64 bit load variants like ldu, ldux, ldx etc. */
421 emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
425 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
426 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
430 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
434 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
435 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
439 emulated = kvmppc_handle_store(run, vcpu,
440 kvmppc_get_gpr(vcpu, rs),
444 /* TBD: Add support for other 64 bit store variants like stdu, stdux, stdx etc. */
447 emulated = kvmppc_handle_store(run, vcpu,
448 kvmppc_get_gpr(vcpu, rs),
453 emulated = kvmppc_handle_store(run, vcpu,
454 kvmppc_get_gpr(vcpu, rs),
456 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
460 emulated = kvmppc_handle_store(run, vcpu,
461 kvmppc_get_gpr(vcpu, rs),
466 emulated = kvmppc_handle_store(run, vcpu,
467 kvmppc_get_gpr(vcpu, rs),
469 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
473 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
477 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
478 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
482 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
486 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
487 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
491 emulated = kvmppc_handle_store(run, vcpu,
492 kvmppc_get_gpr(vcpu, rs),
497 emulated = kvmppc_handle_store(run, vcpu,
498 kvmppc_get_gpr(vcpu, rs),
500 kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
504 emulated = EMULATE_FAIL;
507 if (emulated == EMULATE_FAIL) {
508 emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
509 if (emulated == EMULATE_AGAIN) {
511 } else if (emulated == EMULATE_FAIL) {
513 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
514 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
515 kvmppc_core_queue_program(vcpu, 0);
519 trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
521 /* Advance past emulated instruction. */
523 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);