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_STBUX 247
42 #define OP_31_XOP_LHZX 279
43 #define OP_31_XOP_LHZUX 311
44 #define OP_31_XOP_MFSPR 339
45 #define OP_31_XOP_STHX 407
46 #define OP_31_XOP_STHUX 439
47 #define OP_31_XOP_MTSPR 467
48 #define OP_31_XOP_DCBI 470
49 #define OP_31_XOP_LWBRX 534
50 #define OP_31_XOP_TLBSYNC 566
51 #define OP_31_XOP_STWBRX 662
52 #define OP_31_XOP_LHBRX 790
53 #define OP_31_XOP_STHBRX 918
69 static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
74 static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)
76 return vcpu->arch.tcr & TCR_DIE;
80 void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
82 unsigned long dec_nsec;
84 pr_debug("mtDEC: %x\n", vcpu->arch.dec);
86 /* mtdec lowers the interrupt line when positive. */
87 kvmppc_core_dequeue_dec(vcpu);
89 /* POWER4+ triggers a dec interrupt if the value is < 0 */
90 if (vcpu->arch.dec & 0x80000000) {
91 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
92 kvmppc_core_queue_dec(vcpu);
96 if (kvmppc_dec_enabled(vcpu)) {
97 /* The decrementer ticks at the same rate as the timebase, so
98 * that's how we convert the guest DEC value to the number of
101 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
102 dec_nsec = vcpu->arch.dec;
104 dec_nsec /= tb_ticks_per_usec;
105 hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
107 vcpu->arch.dec_jiffies = get_tb();
109 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
125 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
127 /* XXX Should probably auto-generate instruction decoding for a particular core
128 * from opcode tables in the future. */
129 int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
131 u32 inst = vcpu->arch.last_inst;
138 enum emulation_result emulated = EMULATE_DONE;
141 /* this default type might be overwritten by subcategories */
142 kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
144 pr_debug(KERN_INFO "Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));
146 /* Try again next time */
147 if (inst == KVM_INST_FETCH_FAILED)
150 switch (get_op(inst)) {
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);
176 emulated = kvmppc_handle_store(run, vcpu,
177 kvmppc_get_gpr(vcpu, rs),
183 emulated = kvmppc_handle_store(run, vcpu,
184 kvmppc_get_gpr(vcpu, rs),
188 case OP_31_XOP_STBUX:
193 ea = kvmppc_get_gpr(vcpu, rb);
195 ea += kvmppc_get_gpr(vcpu, ra);
197 emulated = kvmppc_handle_store(run, vcpu,
198 kvmppc_get_gpr(vcpu, rs),
200 kvmppc_set_gpr(vcpu, rs, ea);
205 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
208 case OP_31_XOP_LHZUX:
213 ea = kvmppc_get_gpr(vcpu, rb);
215 ea += kvmppc_get_gpr(vcpu, ra);
217 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
218 kvmppc_set_gpr(vcpu, ra, ea);
221 case OP_31_XOP_MFSPR:
222 sprn = get_sprn(inst);
227 kvmppc_set_gpr(vcpu, rt, vcpu->arch.srr0); break;
229 kvmppc_set_gpr(vcpu, rt, vcpu->arch.srr1); break;
231 kvmppc_set_gpr(vcpu, rt, vcpu->arch.pvr); break;
233 kvmppc_set_gpr(vcpu, rt, vcpu->vcpu_id); break;
235 kvmppc_set_gpr(vcpu, rt, 0); break;
237 /* Note: mftb and TBRL/TBWL are user-accessible, so
238 * the guest can always access the real TB anyways.
239 * In fact, we probably will never see these traps. */
241 kvmppc_set_gpr(vcpu, rt, get_tb() >> 32); break;
243 kvmppc_set_gpr(vcpu, rt, get_tb()); break;
246 kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg0); break;
248 kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg1); break;
250 kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg2); break;
252 kvmppc_set_gpr(vcpu, rt, vcpu->arch.sprg3); break;
253 /* Note: SPRG4-7 are user-readable, so we don't get
258 u64 jd = get_tb() - vcpu->arch.dec_jiffies;
259 kvmppc_set_gpr(vcpu, rt, vcpu->arch.dec - jd);
260 pr_debug(KERN_INFO "mfDEC: %x - %llx = %lx\n",
262 kvmppc_get_gpr(vcpu, rt));
266 emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt);
267 if (emulated == EMULATE_FAIL) {
268 printk("mfspr: unknown spr %x\n", sprn);
269 kvmppc_set_gpr(vcpu, rt, 0);
280 emulated = kvmppc_handle_store(run, vcpu,
281 kvmppc_get_gpr(vcpu, rs),
285 case OP_31_XOP_STHUX:
290 ea = kvmppc_get_gpr(vcpu, rb);
292 ea += kvmppc_get_gpr(vcpu, ra);
294 emulated = kvmppc_handle_store(run, vcpu,
295 kvmppc_get_gpr(vcpu, rs),
297 kvmppc_set_gpr(vcpu, ra, ea);
300 case OP_31_XOP_MTSPR:
301 sprn = get_sprn(inst);
305 vcpu->arch.srr0 = kvmppc_get_gpr(vcpu, rs); break;
307 vcpu->arch.srr1 = kvmppc_get_gpr(vcpu, rs); break;
309 /* XXX We need to context-switch the timebase for
310 * watchdog and FIT. */
311 case SPRN_TBWL: break;
312 case SPRN_TBWU: break;
314 case SPRN_MSSSR0: break;
317 vcpu->arch.dec = kvmppc_get_gpr(vcpu, rs);
318 kvmppc_emulate_dec(vcpu);
322 vcpu->arch.sprg0 = kvmppc_get_gpr(vcpu, rs); break;
324 vcpu->arch.sprg1 = kvmppc_get_gpr(vcpu, rs); break;
326 vcpu->arch.sprg2 = kvmppc_get_gpr(vcpu, rs); break;
328 vcpu->arch.sprg3 = kvmppc_get_gpr(vcpu, rs); break;
331 emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);
332 if (emulated == EMULATE_FAIL)
333 printk("mtspr: unknown spr %x\n", sprn);
339 /* Do nothing. The guest is performing dcbi because
340 * hardware DMA is not snooped by the dcache, but
341 * emulated DMA either goes through the dcache as
342 * normal writes, or the host kernel has handled dcache
346 case OP_31_XOP_LWBRX:
348 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
351 case OP_31_XOP_TLBSYNC:
354 case OP_31_XOP_STWBRX:
359 emulated = kvmppc_handle_store(run, vcpu,
360 kvmppc_get_gpr(vcpu, rs),
364 case OP_31_XOP_LHBRX:
366 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
369 case OP_31_XOP_STHBRX:
374 emulated = kvmppc_handle_store(run, vcpu,
375 kvmppc_get_gpr(vcpu, rs),
380 /* Attempt core-specific emulation below. */
381 emulated = EMULATE_FAIL;
387 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
393 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
394 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
399 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
405 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
406 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
411 emulated = kvmppc_handle_store(run, vcpu,
412 kvmppc_get_gpr(vcpu, rs),
419 emulated = kvmppc_handle_store(run, vcpu,
420 kvmppc_get_gpr(vcpu, rs),
422 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
427 emulated = kvmppc_handle_store(run, vcpu,
428 kvmppc_get_gpr(vcpu, rs),
435 emulated = kvmppc_handle_store(run, vcpu,
436 kvmppc_get_gpr(vcpu, rs),
438 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
443 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
449 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
450 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
455 emulated = kvmppc_handle_store(run, vcpu,
456 kvmppc_get_gpr(vcpu, rs),
463 emulated = kvmppc_handle_store(run, vcpu,
464 kvmppc_get_gpr(vcpu, rs),
466 kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
470 emulated = EMULATE_FAIL;
473 if (emulated == EMULATE_FAIL) {
474 emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
475 if (emulated == EMULATE_FAIL) {
477 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
478 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
479 kvmppc_core_queue_program(vcpu, 0);
483 trace_kvm_ppc_instr(inst, vcpu->arch.pc, emulated);
486 vcpu->arch.pc += 4; /* Advance past emulated instruction. */