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
17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
20 #include <linux/jiffies.h>
21 #include <linux/hrtimer.h>
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/kvm_host.h>
28 #include <asm/byteorder.h>
29 #include <asm/kvm_ppc.h>
30 #include <asm/disassemble.h>
37 #define OP_31_XOP_LWZX 23
38 #define OP_31_XOP_LBZX 87
39 #define OP_31_XOP_STWX 151
40 #define OP_31_XOP_STBX 215
41 #define OP_31_XOP_LBZUX 119
42 #define OP_31_XOP_STBUX 247
43 #define OP_31_XOP_LHZX 279
44 #define OP_31_XOP_LHZUX 311
45 #define OP_31_XOP_MFSPR 339
46 #define OP_31_XOP_LHAX 343
47 #define OP_31_XOP_STHX 407
48 #define OP_31_XOP_STHUX 439
49 #define OP_31_XOP_MTSPR 467
50 #define OP_31_XOP_DCBI 470
51 #define OP_31_XOP_LWBRX 534
52 #define OP_31_XOP_TLBSYNC 566
53 #define OP_31_XOP_STWBRX 662
54 #define OP_31_XOP_LHBRX 790
55 #define OP_31_XOP_STHBRX 918
72 #ifdef CONFIG_PPC_BOOK3S
73 static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
78 static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
80 return vcpu->arch.tcr & TCR_DIE;
84 void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
86 unsigned long dec_nsec;
88 pr_debug("mtDEC: %x\n", vcpu->arch.dec);
89 #ifdef CONFIG_PPC_BOOK3S
90 /* mtdec lowers the interrupt line when positive. */
91 kvmppc_core_dequeue_dec(vcpu);
93 /* POWER4+ triggers a dec interrupt if the value is < 0 */
94 if (vcpu->arch.dec & 0x80000000) {
95 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
96 kvmppc_core_queue_dec(vcpu);
100 if (kvmppc_dec_enabled(vcpu)) {
101 /* The decrementer ticks at the same rate as the timebase, so
102 * that's how we convert the guest DEC value to the number of
105 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
106 dec_nsec = vcpu->arch.dec;
108 dec_nsec /= tb_ticks_per_usec;
109 hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
111 vcpu->arch.dec_jiffies = get_tb();
113 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
129 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
131 /* XXX Should probably auto-generate instruction decoding for a particular core
132 * from opcode tables in the future. */
133 int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
135 u32 inst = kvmppc_get_last_inst(vcpu);
142 enum emulation_result emulated = EMULATE_DONE;
145 /* this default type might be overwritten by subcategories */
146 kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
148 pr_debug("Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));
150 switch (get_op(inst)) {
152 #ifdef CONFIG_PPC_BOOK3S
154 kvmppc_core_queue_program(vcpu, SRR1_PROGTRAP);
156 kvmppc_core_queue_program(vcpu, vcpu->arch.esr | ESR_PTR);
162 switch (get_xop(inst)) {
166 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
171 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
174 case OP_31_XOP_LBZUX:
179 ea = kvmppc_get_gpr(vcpu, rb);
181 ea += kvmppc_get_gpr(vcpu, ra);
183 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
184 kvmppc_set_gpr(vcpu, ra, ea);
189 emulated = kvmppc_handle_store(run, vcpu,
190 kvmppc_get_gpr(vcpu, rs),
196 emulated = kvmppc_handle_store(run, vcpu,
197 kvmppc_get_gpr(vcpu, rs),
201 case OP_31_XOP_STBUX:
206 ea = kvmppc_get_gpr(vcpu, rb);
208 ea += kvmppc_get_gpr(vcpu, ra);
210 emulated = kvmppc_handle_store(run, vcpu,
211 kvmppc_get_gpr(vcpu, rs),
213 kvmppc_set_gpr(vcpu, rs, ea);
218 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
223 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
226 case OP_31_XOP_LHZUX:
231 ea = kvmppc_get_gpr(vcpu, rb);
233 ea += kvmppc_get_gpr(vcpu, ra);
235 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
236 kvmppc_set_gpr(vcpu, ra, ea);
239 case OP_31_XOP_MFSPR:
240 sprn = get_sprn(inst);
245 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr0);
248 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr1);
251 kvmppc_set_gpr(vcpu, rt, vcpu->arch.pvr); break;
253 kvmppc_set_gpr(vcpu, rt, vcpu->vcpu_id); break;
255 kvmppc_set_gpr(vcpu, rt, 0); break;
257 /* Note: mftb and TBRL/TBWL are user-accessible, so
258 * the guest can always access the real TB anyways.
259 * In fact, we probably will never see these traps. */
261 kvmppc_set_gpr(vcpu, rt, get_tb() >> 32); break;
263 kvmppc_set_gpr(vcpu, rt, get_tb()); break;
266 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg0);
269 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg1);
272 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg2);
275 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg3);
277 /* Note: SPRG4-7 are user-readable, so we don't get
282 u64 jd = get_tb() - vcpu->arch.dec_jiffies;
283 kvmppc_set_gpr(vcpu, rt, vcpu->arch.dec - jd);
284 pr_debug("mfDEC: %x - %llx = %lx\n",
286 kvmppc_get_gpr(vcpu, rt));
290 emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt);
291 if (emulated == EMULATE_FAIL) {
292 printk("mfspr: unknown spr %x\n", sprn);
293 kvmppc_set_gpr(vcpu, rt, 0);
304 emulated = kvmppc_handle_store(run, vcpu,
305 kvmppc_get_gpr(vcpu, rs),
309 case OP_31_XOP_STHUX:
314 ea = kvmppc_get_gpr(vcpu, rb);
316 ea += kvmppc_get_gpr(vcpu, ra);
318 emulated = kvmppc_handle_store(run, vcpu,
319 kvmppc_get_gpr(vcpu, rs),
321 kvmppc_set_gpr(vcpu, ra, ea);
324 case OP_31_XOP_MTSPR:
325 sprn = get_sprn(inst);
329 vcpu->arch.shared->srr0 = kvmppc_get_gpr(vcpu, rs);
332 vcpu->arch.shared->srr1 = kvmppc_get_gpr(vcpu, rs);
335 /* XXX We need to context-switch the timebase for
336 * watchdog and FIT. */
337 case SPRN_TBWL: break;
338 case SPRN_TBWU: break;
340 case SPRN_MSSSR0: break;
343 vcpu->arch.dec = kvmppc_get_gpr(vcpu, rs);
344 kvmppc_emulate_dec(vcpu);
348 vcpu->arch.shared->sprg0 = kvmppc_get_gpr(vcpu, rs);
351 vcpu->arch.shared->sprg1 = kvmppc_get_gpr(vcpu, rs);
354 vcpu->arch.shared->sprg2 = kvmppc_get_gpr(vcpu, rs);
357 vcpu->arch.shared->sprg3 = kvmppc_get_gpr(vcpu, rs);
361 emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);
362 if (emulated == EMULATE_FAIL)
363 printk("mtspr: unknown spr %x\n", sprn);
369 /* Do nothing. The guest is performing dcbi because
370 * hardware DMA is not snooped by the dcache, but
371 * emulated DMA either goes through the dcache as
372 * normal writes, or the host kernel has handled dcache
376 case OP_31_XOP_LWBRX:
378 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
381 case OP_31_XOP_TLBSYNC:
384 case OP_31_XOP_STWBRX:
389 emulated = kvmppc_handle_store(run, vcpu,
390 kvmppc_get_gpr(vcpu, rs),
394 case OP_31_XOP_LHBRX:
396 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
399 case OP_31_XOP_STHBRX:
404 emulated = kvmppc_handle_store(run, vcpu,
405 kvmppc_get_gpr(vcpu, rs),
410 /* Attempt core-specific emulation below. */
411 emulated = EMULATE_FAIL;
417 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
423 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
424 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
429 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
435 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
436 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
441 emulated = kvmppc_handle_store(run, vcpu,
442 kvmppc_get_gpr(vcpu, rs),
449 emulated = kvmppc_handle_store(run, vcpu,
450 kvmppc_get_gpr(vcpu, rs),
452 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
457 emulated = kvmppc_handle_store(run, vcpu,
458 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.paddr_accessed);
473 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
479 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
480 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
485 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
491 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
492 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
497 emulated = kvmppc_handle_store(run, vcpu,
498 kvmppc_get_gpr(vcpu, rs),
505 emulated = kvmppc_handle_store(run, vcpu,
506 kvmppc_get_gpr(vcpu, rs),
508 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
512 emulated = EMULATE_FAIL;
515 if (emulated == EMULATE_FAIL) {
516 emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
517 if (emulated == EMULATE_AGAIN) {
519 } else if (emulated == EMULATE_FAIL) {
521 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
522 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
523 kvmppc_core_queue_program(vcpu, 0);
527 trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
529 /* Advance past emulated instruction. */
531 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);