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code style scripts/checkpatch.pl (linux-3.9-rc1) formatting
[linux-2.6.34.14-moxart.git] / arch / powerpc / kvm / booke.c
blobdf0182a2bc2c2e514c731f4fa1cf71a81a15bde7
1 /*
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.
5 *
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.
10 *
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.
14 *
15 * Copyright IBM Corp. 2007
16 *
17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
18 * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
19 */
20
21 #include <linux/errno.h>
22 #include <linux/err.h>
23 #include <linux/kvm_host.h>
24 #include <linux/gfp.h>
25 #include <linux/module.h>
26 #include <linux/vmalloc.h>
27 #include <linux/fs.h>
28
29 #include <asm/cputable.h>
30 #include <asm/uaccess.h>
31 #include <asm/kvm_ppc.h>
32 #include "timing.h"
33 #include <asm/cacheflush.h>
34
35 #include "booke.h"
36
37 unsigned long kvmppc_booke_handlers;
38
39 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
40 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
41
42 struct kvm_stats_debugfs_item debugfs_entries[] = {
43 { "mmio", VCPU_STAT(mmio_exits) },
44 { "dcr", VCPU_STAT(dcr_exits) },
45 { "sig", VCPU_STAT(signal_exits) },
46 { "itlb_r", VCPU_STAT(itlb_real_miss_exits) },
47 { "itlb_v", VCPU_STAT(itlb_virt_miss_exits) },
48 { "dtlb_r", VCPU_STAT(dtlb_real_miss_exits) },
49 { "dtlb_v", VCPU_STAT(dtlb_virt_miss_exits) },
50 { "sysc", VCPU_STAT(syscall_exits) },
51 { "isi", VCPU_STAT(isi_exits) },
52 { "dsi", VCPU_STAT(dsi_exits) },
53 { "inst_emu", VCPU_STAT(emulated_inst_exits) },
54 { "dec", VCPU_STAT(dec_exits) },
55 { "ext_intr", VCPU_STAT(ext_intr_exits) },
56 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
57 { NULL }
58 };
59
60 /* TODO: use vcpu_printf() */
61 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
62 {
63 int i;
64
65 printk("pc: %08lx msr: %08lx\n", vcpu->arch.pc, vcpu->arch.msr);
66 printk("lr: %08lx ctr: %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
67 printk("srr0: %08lx srr1: %08lx\n", vcpu->arch.srr0, vcpu->arch.srr1);
68
69 printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
70
71 for (i = 0; i < 32; i += 4) {
72 printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
73 kvmppc_get_gpr(vcpu, i),
74 kvmppc_get_gpr(vcpu, i+1),
75 kvmppc_get_gpr(vcpu, i+2),
76 kvmppc_get_gpr(vcpu, i+3));
77 }
78 }
79
80 static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
81 unsigned int priority)
82 {
83 set_bit(priority, &vcpu->arch.pending_exceptions);
84 }
85
86 static void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu,
87 ulong dear_flags, ulong esr_flags)
88 {
89 vcpu->arch.queued_dear = dear_flags;
90 vcpu->arch.queued_esr = esr_flags;
91 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
92 }
93
94 static void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu,
95 ulong dear_flags, ulong esr_flags)
96 {
97 vcpu->arch.queued_dear = dear_flags;
98 vcpu->arch.queued_esr = esr_flags;
99 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
100 }
101
102 static void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu,
103 ulong esr_flags)
104 {
105 vcpu->arch.queued_esr = esr_flags;
106 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
107 }
108
109 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong esr_flags)
110 {
111 vcpu->arch.queued_esr = esr_flags;
112 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
113 }
114
115 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
116 {
117 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
118 }
119
120 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
121 {
122 return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
123 }
124
125 void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
126 {
127 clear_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
128 }
129
130 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
131 struct kvm_interrupt *irq)
132 {
133 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_EXTERNAL);
134 }
135
136 /* Deliver the interrupt of the corresponding priority, if possible. */
137 static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
138 unsigned int priority)
139 {
140 int allowed = 0;
141 ulong msr_mask;
142 bool update_esr = false, update_dear = false;
143
144 switch (priority) {
145 case BOOKE_IRQPRIO_DTLB_MISS:
146 case BOOKE_IRQPRIO_DATA_STORAGE:
147 update_dear = true;
148 /* fall through */
149 case BOOKE_IRQPRIO_INST_STORAGE:
150 case BOOKE_IRQPRIO_PROGRAM:
151 update_esr = true;
152 /* fall through */
153 case BOOKE_IRQPRIO_ITLB_MISS:
154 case BOOKE_IRQPRIO_SYSCALL:
155 case BOOKE_IRQPRIO_FP_UNAVAIL:
156 case BOOKE_IRQPRIO_SPE_UNAVAIL:
157 case BOOKE_IRQPRIO_SPE_FP_DATA:
158 case BOOKE_IRQPRIO_SPE_FP_ROUND:
159 case BOOKE_IRQPRIO_AP_UNAVAIL:
160 case BOOKE_IRQPRIO_ALIGNMENT:
161 allowed = 1;
162 msr_mask = MSR_CE|MSR_ME|MSR_DE;
163 break;
164 case BOOKE_IRQPRIO_CRITICAL:
165 case BOOKE_IRQPRIO_WATCHDOG:
166 allowed = vcpu->arch.msr & MSR_CE;
167 msr_mask = MSR_ME;
168 break;
169 case BOOKE_IRQPRIO_MACHINE_CHECK:
170 allowed = vcpu->arch.msr & MSR_ME;
171 msr_mask = 0;
172 break;
173 case BOOKE_IRQPRIO_EXTERNAL:
174 case BOOKE_IRQPRIO_DECREMENTER:
175 case BOOKE_IRQPRIO_FIT:
176 allowed = vcpu->arch.msr & MSR_EE;
177 msr_mask = MSR_CE|MSR_ME|MSR_DE;
178 break;
179 case BOOKE_IRQPRIO_DEBUG:
180 allowed = vcpu->arch.msr & MSR_DE;
181 msr_mask = MSR_ME;
182 break;
183 }
184
185 if (allowed) {
186 vcpu->arch.srr0 = vcpu->arch.pc;
187 vcpu->arch.srr1 = vcpu->arch.msr;
188 vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority];
189 if (update_esr == true)
190 vcpu->arch.esr = vcpu->arch.queued_esr;
191 if (update_dear == true)
192 vcpu->arch.dear = vcpu->arch.queued_dear;
193 kvmppc_set_msr(vcpu, vcpu->arch.msr & msr_mask);
194
195 clear_bit(priority, &vcpu->arch.pending_exceptions);
196 }
197
198 return allowed;
199 }
200
201 /* Check pending exceptions and deliver one, if possible. */
202 void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
203 {
204 unsigned long *pending = &vcpu->arch.pending_exceptions;
205 unsigned int priority;
206
207 priority = __ffs(*pending);
208 while (priority <= BOOKE_IRQPRIO_MAX) {
209 if (kvmppc_booke_irqprio_deliver(vcpu, priority))
210 break;
211
212 priority = find_next_bit(pending,
213 BITS_PER_BYTE * sizeof(*pending),
214 priority + 1);
215 }
216 }
217
218 /**
219 * kvmppc_handle_exit
220 *
221 * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
222 */
223 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
224 unsigned int exit_nr)
225 {
226 enum emulation_result er;
227 int r = RESUME_HOST;
228
229 /* update before a new last_exit_type is rewritten */
230 kvmppc_update_timing_stats(vcpu);
231
232 local_irq_enable();
233
234 run->exit_reason = KVM_EXIT_UNKNOWN;
235 run->ready_for_interrupt_injection = 1;
236
237 switch (exit_nr) {
238 case BOOKE_INTERRUPT_MACHINE_CHECK:
239 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
240 kvmppc_dump_vcpu(vcpu);
241 r = RESUME_HOST;
242 break;
243
244 case BOOKE_INTERRUPT_EXTERNAL:
245 kvmppc_account_exit(vcpu, EXT_INTR_EXITS);
246 if (need_resched())
247 cond_resched();
248 r = RESUME_GUEST;
249 break;
250
251 case BOOKE_INTERRUPT_DECREMENTER:
252 /* Since we switched IVPR back to the host's value, the host
253 * handled this interrupt the moment we enabled interrupts.
254 * Now we just offer it a chance to reschedule the guest. */
255 kvmppc_account_exit(vcpu, DEC_EXITS);
256 if (need_resched())
257 cond_resched();
258 r = RESUME_GUEST;
259 break;
260
261 case BOOKE_INTERRUPT_PROGRAM:
262 if (vcpu->arch.msr & MSR_PR) {
263 /* Program traps generated by user-level software must be handled
264 * by the guest kernel. */
265 kvmppc_core_queue_program(vcpu, vcpu->arch.fault_esr);
266 r = RESUME_GUEST;
267 kvmppc_account_exit(vcpu, USR_PR_INST);
268 break;
269 }
270
271 er = kvmppc_emulate_instruction(run, vcpu);
272 switch (er) {
273 case EMULATE_DONE:
274 /* don't overwrite subtypes, just account kvm_stats */
275 kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS);
276 /* Future optimization: only reload non-volatiles if
277 * they were actually modified by emulation. */
278 r = RESUME_GUEST_NV;
279 break;
280 case EMULATE_DO_DCR:
281 run->exit_reason = KVM_EXIT_DCR;
282 r = RESUME_HOST;
283 break;
284 case EMULATE_FAIL:
285 /* XXX Deliver Program interrupt to guest. */
286 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
287 __func__, vcpu->arch.pc, vcpu->arch.last_inst);
288 /* For debugging, encode the failing instruction and
289 * report it to userspace. */
290 run->hw.hardware_exit_reason = ~0ULL << 32;
291 run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
292 r = RESUME_HOST;
293 break;
294 default:
295 BUG();
296 }
297 break;
298
299 case BOOKE_INTERRUPT_FP_UNAVAIL:
300 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
301 kvmppc_account_exit(vcpu, FP_UNAVAIL);
302 r = RESUME_GUEST;
303 break;
304
305 case BOOKE_INTERRUPT_SPE_UNAVAIL:
306 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_UNAVAIL);
307 r = RESUME_GUEST;
308 break;
309
310 case BOOKE_INTERRUPT_SPE_FP_DATA:
311 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_DATA);
312 r = RESUME_GUEST;
313 break;
314
315 case BOOKE_INTERRUPT_SPE_FP_ROUND:
316 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_ROUND);
317 r = RESUME_GUEST;
318 break;
319
320 case BOOKE_INTERRUPT_DATA_STORAGE:
321 kvmppc_core_queue_data_storage(vcpu, vcpu->arch.fault_dear,
322 vcpu->arch.fault_esr);
323 kvmppc_account_exit(vcpu, DSI_EXITS);
324 r = RESUME_GUEST;
325 break;
326
327 case BOOKE_INTERRUPT_INST_STORAGE:
328 kvmppc_core_queue_inst_storage(vcpu, vcpu->arch.fault_esr);
329 kvmppc_account_exit(vcpu, ISI_EXITS);
330 r = RESUME_GUEST;
331 break;
332
333 case BOOKE_INTERRUPT_SYSCALL:
334 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
335 kvmppc_account_exit(vcpu, SYSCALL_EXITS);
336 r = RESUME_GUEST;
337 break;
338
339 case BOOKE_INTERRUPT_DTLB_MISS: {
340 unsigned long eaddr = vcpu->arch.fault_dear;
341 int gtlb_index;
342 gpa_t gpaddr;
343 gfn_t gfn;
344
345 /* Check the guest TLB. */
346 gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
347 if (gtlb_index < 0) {
348 /* The guest didn't have a mapping for it. */
349 kvmppc_core_queue_dtlb_miss(vcpu,
350 vcpu->arch.fault_dear,
351 vcpu->arch.fault_esr);
352 kvmppc_mmu_dtlb_miss(vcpu);
353 kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS);
354 r = RESUME_GUEST;
355 break;
356 }
357
358 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
359 gfn = gpaddr >> PAGE_SHIFT;
360
361 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
362 /* The guest TLB had a mapping, but the shadow TLB
363 * didn't, and it is RAM. This could be because:
364 * a) the entry is mapping the host kernel, or
365 * b) the guest used a large mapping which we're faking
366 * Either way, we need to satisfy the fault without
367 * invoking the guest. */
368 kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
369 kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
370 r = RESUME_GUEST;
371 } else {
372 /* Guest has mapped and accessed a page which is not
373 * actually RAM. */
374 vcpu->arch.paddr_accessed = gpaddr;
375 r = kvmppc_emulate_mmio(run, vcpu);
376 kvmppc_account_exit(vcpu, MMIO_EXITS);
377 }
378
379 break;
380 }
381
382 case BOOKE_INTERRUPT_ITLB_MISS: {
383 unsigned long eaddr = vcpu->arch.pc;
384 gpa_t gpaddr;
385 gfn_t gfn;
386 int gtlb_index;
387
388 r = RESUME_GUEST;
389
390 /* Check the guest TLB. */
391 gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr);
392 if (gtlb_index < 0) {
393 /* The guest didn't have a mapping for it. */
394 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
395 kvmppc_mmu_itlb_miss(vcpu);
396 kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS);
397 break;
398 }
399
400 kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS);
401
402 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
403 gfn = gpaddr >> PAGE_SHIFT;
404
405 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
406 /* The guest TLB had a mapping, but the shadow TLB
407 * didn't. This could be because:
408 * a) the entry is mapping the host kernel, or
409 * b) the guest used a large mapping which we're faking
410 * Either way, we need to satisfy the fault without
411 * invoking the guest. */
412 kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
413 } else {
414 /* Guest mapped and leaped at non-RAM! */
415 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK);
416 }
417
418 break;
419 }
420
421 case BOOKE_INTERRUPT_DEBUG: {
422 u32 dbsr;
423
424 vcpu->arch.pc = mfspr(SPRN_CSRR0);
425
426 /* clear IAC events in DBSR register */
427 dbsr = mfspr(SPRN_DBSR);
428 dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
429 mtspr(SPRN_DBSR, dbsr);
430
431 run->exit_reason = KVM_EXIT_DEBUG;
432 kvmppc_account_exit(vcpu, DEBUG_EXITS);
433 r = RESUME_HOST;
434 break;
435 }
436
437 default:
438 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
439 BUG();
440 }
441
442 local_irq_disable();
443
444 kvmppc_core_deliver_interrupts(vcpu);
445
446 if (!(r & RESUME_HOST)) {
447 /* To avoid clobbering exit_reason, only check for signals if
448 * we aren't already exiting to userspace for some other
449 * reason. */
450 if (signal_pending(current)) {
451 run->exit_reason = KVM_EXIT_INTR;
452 r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
453 kvmppc_account_exit(vcpu, SIGNAL_EXITS);
454 }
455 }
456
457 return r;
458 }
459
460 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
461 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
462 {
463 vcpu->arch.pc = 0;
464 vcpu->arch.msr = 0;
465 kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */
466
467 vcpu->arch.shadow_pid = 1;
468
469 /* Eye-catching number so we know if the guest takes an interrupt
470 * before it's programmed its own IVPR. */
471 vcpu->arch.ivpr = 0x55550000;
472
473 kvmppc_init_timing_stats(vcpu);
474
475 return kvmppc_core_vcpu_setup(vcpu);
476 }
477
478 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
479 {
480 int i;
481
482 vcpu_load(vcpu);
483
484 regs->pc = vcpu->arch.pc;
485 regs->cr = kvmppc_get_cr(vcpu);
486 regs->ctr = vcpu->arch.ctr;
487 regs->lr = vcpu->arch.lr;
488 regs->xer = kvmppc_get_xer(vcpu);
489 regs->msr = vcpu->arch.msr;
490 regs->srr0 = vcpu->arch.srr0;
491 regs->srr1 = vcpu->arch.srr1;
492 regs->pid = vcpu->arch.pid;
493 regs->sprg0 = vcpu->arch.sprg0;
494 regs->sprg1 = vcpu->arch.sprg1;
495 regs->sprg2 = vcpu->arch.sprg2;
496 regs->sprg3 = vcpu->arch.sprg3;
497 regs->sprg5 = vcpu->arch.sprg4;
498 regs->sprg6 = vcpu->arch.sprg5;
499 regs->sprg7 = vcpu->arch.sprg6;
500
501 for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
502 regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
503
504 vcpu_put(vcpu);
505
506 return 0;
507 }
508
509 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
510 {
511 int i;
512
513 vcpu_load(vcpu);
514
515 vcpu->arch.pc = regs->pc;
516 kvmppc_set_cr(vcpu, regs->cr);
517 vcpu->arch.ctr = regs->ctr;
518 vcpu->arch.lr = regs->lr;
519 kvmppc_set_xer(vcpu, regs->xer);
520 kvmppc_set_msr(vcpu, regs->msr);
521 vcpu->arch.srr0 = regs->srr0;
522 vcpu->arch.srr1 = regs->srr1;
523 vcpu->arch.sprg0 = regs->sprg0;
524 vcpu->arch.sprg1 = regs->sprg1;
525 vcpu->arch.sprg2 = regs->sprg2;
526 vcpu->arch.sprg3 = regs->sprg3;
527 vcpu->arch.sprg5 = regs->sprg4;
528 vcpu->arch.sprg6 = regs->sprg5;
529 vcpu->arch.sprg7 = regs->sprg6;
530
531 for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
532 kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
533
534 vcpu_put(vcpu);
535
536 return 0;
537 }
538
539 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
540 struct kvm_sregs *sregs)
541 {
542 return -ENOTSUPP;
543 }
544
545 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
546 struct kvm_sregs *sregs)
547 {
548 return -ENOTSUPP;
549 }
550
551 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
552 {
553 return -ENOTSUPP;
554 }
555
556 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
557 {
558 return -ENOTSUPP;
559 }
560
561 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
562 struct kvm_translation *tr)
563 {
564 int r;
565
566 vcpu_load(vcpu);
567 r = kvmppc_core_vcpu_translate(vcpu, tr);
568 vcpu_put(vcpu);
569 return r;
570 }
571
572 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
573 {
574 return -ENOTSUPP;
575 }
576
577 int __init kvmppc_booke_init(void)
578 {
579 unsigned long ivor[16];
580 unsigned long max_ivor = 0;
581 int i;
582
583 /* We install our own exception handlers by hijacking IVPR. IVPR must
584 * be 16-bit aligned, so we need a 64KB allocation. */
585 kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
586 VCPU_SIZE_ORDER);
587 if (!kvmppc_booke_handlers)
588 return -ENOMEM;
589
590 /* XXX make sure our handlers are smaller than Linux's */
591
592 /* Copy our interrupt handlers to match host IVORs. That way we don't
593 * have to swap the IVORs on every guest/host transition. */
594 ivor[0] = mfspr(SPRN_IVOR0);
595 ivor[1] = mfspr(SPRN_IVOR1);
596 ivor[2] = mfspr(SPRN_IVOR2);
597 ivor[3] = mfspr(SPRN_IVOR3);
598 ivor[4] = mfspr(SPRN_IVOR4);
599 ivor[5] = mfspr(SPRN_IVOR5);
600 ivor[6] = mfspr(SPRN_IVOR6);
601 ivor[7] = mfspr(SPRN_IVOR7);
602 ivor[8] = mfspr(SPRN_IVOR8);
603 ivor[9] = mfspr(SPRN_IVOR9);
604 ivor[10] = mfspr(SPRN_IVOR10);
605 ivor[11] = mfspr(SPRN_IVOR11);
606 ivor[12] = mfspr(SPRN_IVOR12);
607 ivor[13] = mfspr(SPRN_IVOR13);
608 ivor[14] = mfspr(SPRN_IVOR14);
609 ivor[15] = mfspr(SPRN_IVOR15);
610
611 for (i = 0; i < 16; i++) {
612 if (ivor[i] > max_ivor)
613 max_ivor = ivor[i];
614
615 memcpy((void *)kvmppc_booke_handlers + ivor[i],
616 kvmppc_handlers_start + i * kvmppc_handler_len,
617 kvmppc_handler_len);
618 }
619 flush_icache_range(kvmppc_booke_handlers,
620 kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
621
622 return 0;
623 }
624
625 void __exit kvmppc_booke_exit(void)
626 {
627 free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
628 kvm_exit();
629 }
Linux ARM platform port for MOXA ART SoC