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;
87 unsigned long long dec_time;
89 pr_debug("mtDEC: %x\n", vcpu->arch.dec);
90 #ifdef CONFIG_PPC_BOOK3S
91 /* mtdec lowers the interrupt line when positive. */
92 kvmppc_core_dequeue_dec(vcpu);
94 /* POWER4+ triggers a dec interrupt if the value is < 0 */
95 if (vcpu->arch.dec & 0x80000000) {
96 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
97 kvmppc_core_queue_dec(vcpu);
101 if (kvmppc_dec_enabled(vcpu)) {
102 /* The decrementer ticks at the same rate as the timebase, so
103 * that's how we convert the guest DEC value to the number of
106 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
107 dec_time = vcpu->arch.dec;
109 do_div(dec_time, tb_ticks_per_usec);
110 dec_nsec = do_div(dec_time, NSEC_PER_SEC);
111 hrtimer_start(&vcpu->arch.dec_timer,
112 ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
113 vcpu->arch.dec_jiffies = get_tb();
115 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
119 u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb)
121 u64 jd = tb - vcpu->arch.dec_jiffies;
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, vcpu->arch.esr | ESR_PTR);
170 switch (get_xop(inst)) {
174 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
179 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
182 case OP_31_XOP_LBZUX:
187 ea = kvmppc_get_gpr(vcpu, rb);
189 ea += kvmppc_get_gpr(vcpu, ra);
191 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
192 kvmppc_set_gpr(vcpu, ra, ea);
197 emulated = kvmppc_handle_store(run, vcpu,
198 kvmppc_get_gpr(vcpu, rs),
204 emulated = kvmppc_handle_store(run, vcpu,
205 kvmppc_get_gpr(vcpu, rs),
209 case OP_31_XOP_STBUX:
214 ea = kvmppc_get_gpr(vcpu, rb);
216 ea += kvmppc_get_gpr(vcpu, ra);
218 emulated = kvmppc_handle_store(run, vcpu,
219 kvmppc_get_gpr(vcpu, rs),
221 kvmppc_set_gpr(vcpu, rs, ea);
226 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
231 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
234 case OP_31_XOP_LHZUX:
239 ea = kvmppc_get_gpr(vcpu, rb);
241 ea += kvmppc_get_gpr(vcpu, ra);
243 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
244 kvmppc_set_gpr(vcpu, ra, ea);
247 case OP_31_XOP_MFSPR:
248 sprn = get_sprn(inst);
253 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr0);
256 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->srr1);
259 kvmppc_set_gpr(vcpu, rt, vcpu->arch.pvr); break;
261 kvmppc_set_gpr(vcpu, rt, vcpu->vcpu_id); break;
263 kvmppc_set_gpr(vcpu, rt, 0); break;
265 /* Note: mftb and TBRL/TBWL are user-accessible, so
266 * the guest can always access the real TB anyways.
267 * In fact, we probably will never see these traps. */
269 kvmppc_set_gpr(vcpu, rt, get_tb() >> 32); break;
271 kvmppc_set_gpr(vcpu, rt, get_tb()); break;
274 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg0);
277 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg1);
280 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg2);
283 kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->sprg3);
285 /* Note: SPRG4-7 are user-readable, so we don't get
290 kvmppc_set_gpr(vcpu, rt,
291 kvmppc_get_dec(vcpu, get_tb()));
295 emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt);
296 if (emulated == EMULATE_FAIL) {
297 printk("mfspr: unknown spr %x\n", sprn);
298 kvmppc_set_gpr(vcpu, rt, 0);
302 kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS);
310 emulated = kvmppc_handle_store(run, vcpu,
311 kvmppc_get_gpr(vcpu, rs),
315 case OP_31_XOP_STHUX:
320 ea = kvmppc_get_gpr(vcpu, rb);
322 ea += kvmppc_get_gpr(vcpu, ra);
324 emulated = kvmppc_handle_store(run, vcpu,
325 kvmppc_get_gpr(vcpu, rs),
327 kvmppc_set_gpr(vcpu, ra, ea);
330 case OP_31_XOP_MTSPR:
331 sprn = get_sprn(inst);
335 vcpu->arch.shared->srr0 = kvmppc_get_gpr(vcpu, rs);
338 vcpu->arch.shared->srr1 = kvmppc_get_gpr(vcpu, rs);
341 /* XXX We need to context-switch the timebase for
342 * watchdog and FIT. */
343 case SPRN_TBWL: break;
344 case SPRN_TBWU: break;
346 case SPRN_MSSSR0: break;
349 vcpu->arch.dec = kvmppc_get_gpr(vcpu, rs);
350 kvmppc_emulate_dec(vcpu);
354 vcpu->arch.shared->sprg0 = kvmppc_get_gpr(vcpu, rs);
357 vcpu->arch.shared->sprg1 = kvmppc_get_gpr(vcpu, rs);
360 vcpu->arch.shared->sprg2 = kvmppc_get_gpr(vcpu, rs);
363 vcpu->arch.shared->sprg3 = kvmppc_get_gpr(vcpu, rs);
367 emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);
368 if (emulated == EMULATE_FAIL)
369 printk("mtspr: unknown spr %x\n", sprn);
372 kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS);
376 /* Do nothing. The guest is performing dcbi because
377 * hardware DMA is not snooped by the dcache, but
378 * emulated DMA either goes through the dcache as
379 * normal writes, or the host kernel has handled dcache
383 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:
396 emulated = kvmppc_handle_store(run, vcpu,
397 kvmppc_get_gpr(vcpu, rs),
401 case OP_31_XOP_LHBRX:
403 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
406 case OP_31_XOP_STHBRX:
411 emulated = kvmppc_handle_store(run, vcpu,
412 kvmppc_get_gpr(vcpu, rs),
417 /* Attempt core-specific emulation below. */
418 emulated = EMULATE_FAIL;
424 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
430 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
431 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
436 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
442 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
443 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
448 emulated = kvmppc_handle_store(run, vcpu,
449 kvmppc_get_gpr(vcpu, rs),
456 emulated = kvmppc_handle_store(run, vcpu,
457 kvmppc_get_gpr(vcpu, rs),
459 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
464 emulated = kvmppc_handle_store(run, vcpu,
465 kvmppc_get_gpr(vcpu, rs),
472 emulated = kvmppc_handle_store(run, vcpu,
473 kvmppc_get_gpr(vcpu, rs),
475 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
480 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
486 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
487 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
492 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
498 emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
499 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
504 emulated = kvmppc_handle_store(run, vcpu,
505 kvmppc_get_gpr(vcpu, rs),
512 emulated = kvmppc_handle_store(run, vcpu,
513 kvmppc_get_gpr(vcpu, rs),
515 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
519 emulated = EMULATE_FAIL;
522 if (emulated == EMULATE_FAIL) {
523 emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
524 if (emulated == EMULATE_AGAIN) {
526 } else if (emulated == EMULATE_FAIL) {
528 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
529 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
530 kvmppc_core_queue_program(vcpu, 0);
534 trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
536 /* Advance past emulated instruction. */
538 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);