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/timer.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>
36 #define OP_31_XOP_LWZX 23
37 #define OP_31_XOP_LBZX 87
38 #define OP_31_XOP_STWX 151
39 #define OP_31_XOP_STBX 215
40 #define OP_31_XOP_STBUX 247
41 #define OP_31_XOP_LHZX 279
42 #define OP_31_XOP_LHZUX 311
43 #define OP_31_XOP_MFSPR 339
44 #define OP_31_XOP_STHX 407
45 #define OP_31_XOP_STHUX 439
46 #define OP_31_XOP_MTSPR 467
47 #define OP_31_XOP_DCBI 470
48 #define OP_31_XOP_LWBRX 534
49 #define OP_31_XOP_TLBSYNC 566
50 #define OP_31_XOP_STWBRX 662
51 #define OP_31_XOP_LHBRX 790
52 #define OP_31_XOP_STHBRX 918
67 void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
69 if (vcpu->arch.tcr & TCR_DIE) {
70 /* The decrementer ticks at the same rate as the timebase, so
71 * that's how we convert the guest DEC value to the number of
73 unsigned long nr_jiffies;
75 nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy;
76 mod_timer(&vcpu->arch.dec_timer,
77 get_jiffies_64() + nr_jiffies);
79 del_timer(&vcpu->arch.dec_timer);
95 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
97 /* XXX Should probably auto-generate instruction decoding for a particular core
98 * from opcode tables in the future. */
99 int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
101 u32 inst = vcpu->arch.last_inst;
108 enum emulation_result emulated = EMULATE_DONE;
111 /* this default type might be overwritten by subcategories */
112 kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
114 switch (get_op(inst)) {
116 vcpu->arch.esr |= ESR_PTR;
117 kvmppc_core_queue_program(vcpu);
122 switch (get_xop(inst)) {
126 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
131 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
136 emulated = kvmppc_handle_store(run, vcpu,
143 emulated = kvmppc_handle_store(run, vcpu,
148 case OP_31_XOP_STBUX:
153 ea = vcpu->arch.gpr[rb];
155 ea += vcpu->arch.gpr[ra];
157 emulated = kvmppc_handle_store(run, vcpu,
160 vcpu->arch.gpr[rs] = ea;
165 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
168 case OP_31_XOP_LHZUX:
173 ea = vcpu->arch.gpr[rb];
175 ea += vcpu->arch.gpr[ra];
177 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
178 vcpu->arch.gpr[ra] = ea;
181 case OP_31_XOP_MFSPR:
182 sprn = get_sprn(inst);
187 vcpu->arch.gpr[rt] = vcpu->arch.srr0; break;
189 vcpu->arch.gpr[rt] = vcpu->arch.srr1; break;
191 vcpu->arch.gpr[rt] = mfspr(SPRN_PVR); break;
193 vcpu->arch.gpr[rt] = mfspr(SPRN_PIR); break;
195 /* Note: mftb and TBRL/TBWL are user-accessible, so
196 * the guest can always access the real TB anyways.
197 * In fact, we probably will never see these traps. */
199 vcpu->arch.gpr[rt] = mftbl(); break;
201 vcpu->arch.gpr[rt] = mftbu(); break;
204 vcpu->arch.gpr[rt] = vcpu->arch.sprg0; break;
206 vcpu->arch.gpr[rt] = vcpu->arch.sprg1; break;
208 vcpu->arch.gpr[rt] = vcpu->arch.sprg2; break;
210 vcpu->arch.gpr[rt] = vcpu->arch.sprg3; break;
211 /* Note: SPRG4-7 are user-readable, so we don't get
215 emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt);
216 if (emulated == EMULATE_FAIL) {
217 printk("mfspr: unknown spr %x\n", sprn);
218 vcpu->arch.gpr[rt] = 0;
229 emulated = kvmppc_handle_store(run, vcpu,
234 case OP_31_XOP_STHUX:
239 ea = vcpu->arch.gpr[rb];
241 ea += vcpu->arch.gpr[ra];
243 emulated = kvmppc_handle_store(run, vcpu,
246 vcpu->arch.gpr[ra] = ea;
249 case OP_31_XOP_MTSPR:
250 sprn = get_sprn(inst);
254 vcpu->arch.srr0 = vcpu->arch.gpr[rs]; break;
256 vcpu->arch.srr1 = vcpu->arch.gpr[rs]; break;
258 /* XXX We need to context-switch the timebase for
259 * watchdog and FIT. */
260 case SPRN_TBWL: break;
261 case SPRN_TBWU: break;
264 vcpu->arch.dec = vcpu->arch.gpr[rs];
265 kvmppc_emulate_dec(vcpu);
269 vcpu->arch.sprg0 = vcpu->arch.gpr[rs]; break;
271 vcpu->arch.sprg1 = vcpu->arch.gpr[rs]; break;
273 vcpu->arch.sprg2 = vcpu->arch.gpr[rs]; break;
275 vcpu->arch.sprg3 = vcpu->arch.gpr[rs]; break;
278 emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs);
279 if (emulated == EMULATE_FAIL)
280 printk("mtspr: unknown spr %x\n", sprn);
286 /* Do nothing. The guest is performing dcbi because
287 * hardware DMA is not snooped by the dcache, but
288 * emulated DMA either goes through the dcache as
289 * normal writes, or the host kernel has handled dcache
293 case OP_31_XOP_LWBRX:
295 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
298 case OP_31_XOP_TLBSYNC:
301 case OP_31_XOP_STWBRX:
306 emulated = kvmppc_handle_store(run, vcpu,
311 case OP_31_XOP_LHBRX:
313 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
316 case OP_31_XOP_STHBRX:
321 emulated = kvmppc_handle_store(run, vcpu,
327 /* Attempt core-specific emulation below. */
328 emulated = EMULATE_FAIL;
334 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
340 emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
341 vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
346 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
352 emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
353 vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
358 emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
365 emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
367 vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
372 emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
379 emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
381 vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
386 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
392 emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
393 vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
398 emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
405 emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
407 vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
411 emulated = EMULATE_FAIL;
414 if (emulated == EMULATE_FAIL) {
415 emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance);
416 if (emulated == EMULATE_FAIL) {
418 printk(KERN_ERR "Couldn't emulate instruction 0x%08x "
419 "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst));
423 trace_kvm_ppc_instr(inst, vcpu->arch.pc, emulated);
426 vcpu->arch.pc += 4; /* Advance past emulated instruction. */