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KVM: PPC: Add feature bitmap for magic page
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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/module.h>
25 #include <linux/vmalloc.h>
26 #include <linux/hrtimer.h>
27 #include <linux/fs.h>
28 #include <linux/slab.h>
29 #include <asm/cputable.h>
30 #include <asm/uaccess.h>
31 #include <asm/kvm_ppc.h>
32 #include <asm/tlbflush.h>
33 #include "timing.h"
34 #include "../mm/mmu_decl.h"
35
36 #define CREATE_TRACE_POINTS
37 #include "trace.h"
38
39 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
40 {
41         return !(v->arch.shared->msr & MSR_WE) ||
42                !!(v->arch.pending_exceptions);
43 }
44
45 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
46 {
47         int nr = kvmppc_get_gpr(vcpu, 11);
48         int r;
49         unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
50         unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
51         unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
52         unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
53         unsigned long r2 = 0;
54
55         if (!(vcpu->arch.shared->msr & MSR_SF)) {
56                 /* 32 bit mode */
57                 param1 &= 0xffffffff;
58                 param2 &= 0xffffffff;
59                 param3 &= 0xffffffff;
60                 param4 &= 0xffffffff;
61         }
62
63         switch (nr) {
64         case HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE:
65         {
66                 vcpu->arch.magic_page_pa = param1;
67                 vcpu->arch.magic_page_ea = param2;
68
69                 r2 = 0;
70
71                 r = HC_EV_SUCCESS;
72                 break;
73         }
74         case HC_VENDOR_KVM | KVM_HC_FEATURES:
75                 r = HC_EV_SUCCESS;
76 #if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
77                 r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
78 #endif
79
80                 /* Second return value is in r4 */
81                 break;
82         default:
83                 r = HC_EV_UNIMPLEMENTED;
84                 break;
85         }
86
87         kvmppc_set_gpr(vcpu, 4, r2);
88
89         return r;
90 }
91
92 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
93 {
94         enum emulation_result er;
95         int r;
96
97         er = kvmppc_emulate_instruction(run, vcpu);
98         switch (er) {
99         case EMULATE_DONE:
100                 /* Future optimization: only reload non-volatiles if they were
101                  * actually modified. */
102                 r = RESUME_GUEST_NV;
103                 break;
104         case EMULATE_DO_MMIO:
105                 run->exit_reason = KVM_EXIT_MMIO;
106                 /* We must reload nonvolatiles because "update" load/store
107                  * instructions modify register state. */
108                 /* Future optimization: only reload non-volatiles if they were
109                  * actually modified. */
110                 r = RESUME_HOST_NV;
111                 break;
112         case EMULATE_FAIL:
113                 /* XXX Deliver Program interrupt to guest. */
114                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
115                        kvmppc_get_last_inst(vcpu));
116                 r = RESUME_HOST;
117                 break;
118         default:
119                 BUG();
120         }
121
122         return r;
123 }
124
125 int kvm_arch_hardware_enable(void *garbage)
126 {
127         return 0;
128 }
129
130 void kvm_arch_hardware_disable(void *garbage)
131 {
132 }
133
134 int kvm_arch_hardware_setup(void)
135 {
136         return 0;
137 }
138
139 void kvm_arch_hardware_unsetup(void)
140 {
141 }
142
143 void kvm_arch_check_processor_compat(void *rtn)
144 {
145         *(int *)rtn = kvmppc_core_check_processor_compat();
146 }
147
148 struct kvm *kvm_arch_create_vm(void)
149 {
150         struct kvm *kvm;
151
152         kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
153         if (!kvm)
154                 return ERR_PTR(-ENOMEM);
155
156         return kvm;
157 }
158
159 static void kvmppc_free_vcpus(struct kvm *kvm)
160 {
161         unsigned int i;
162         struct kvm_vcpu *vcpu;
163
164         kvm_for_each_vcpu(i, vcpu, kvm)
165                 kvm_arch_vcpu_free(vcpu);
166
167         mutex_lock(&kvm->lock);
168         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
169                 kvm->vcpus[i] = NULL;
170
171         atomic_set(&kvm->online_vcpus, 0);
172         mutex_unlock(&kvm->lock);
173 }
174
175 void kvm_arch_sync_events(struct kvm *kvm)
176 {
177 }
178
179 void kvm_arch_destroy_vm(struct kvm *kvm)
180 {
181         kvmppc_free_vcpus(kvm);
182         kvm_free_physmem(kvm);
183         cleanup_srcu_struct(&kvm->srcu);
184         kfree(kvm);
185 }
186
187 int kvm_dev_ioctl_check_extension(long ext)
188 {
189         int r;
190
191         switch (ext) {
192         case KVM_CAP_PPC_SEGSTATE:
193         case KVM_CAP_PPC_PAIRED_SINGLES:
194         case KVM_CAP_PPC_UNSET_IRQ:
195         case KVM_CAP_ENABLE_CAP:
196         case KVM_CAP_PPC_OSI:
197         case KVM_CAP_PPC_GET_PVINFO:
198                 r = 1;
199                 break;
200         case KVM_CAP_COALESCED_MMIO:
201                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
202                 break;
203         default:
204                 r = 0;
205                 break;
206         }
207         return r;
208
209 }
210
211 long kvm_arch_dev_ioctl(struct file *filp,
212                         unsigned int ioctl, unsigned long arg)
213 {
214         return -EINVAL;
215 }
216
217 int kvm_arch_prepare_memory_region(struct kvm *kvm,
218                                    struct kvm_memory_slot *memslot,
219                                    struct kvm_memory_slot old,
220                                    struct kvm_userspace_memory_region *mem,
221                                    int user_alloc)
222 {
223         return 0;
224 }
225
226 void kvm_arch_commit_memory_region(struct kvm *kvm,
227                struct kvm_userspace_memory_region *mem,
228                struct kvm_memory_slot old,
229                int user_alloc)
230 {
231        return;
232 }
233
234
235 void kvm_arch_flush_shadow(struct kvm *kvm)
236 {
237 }
238
239 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
240 {
241         struct kvm_vcpu *vcpu;
242         vcpu = kvmppc_core_vcpu_create(kvm, id);
243         if (!IS_ERR(vcpu))
244                 kvmppc_create_vcpu_debugfs(vcpu, id);
245         return vcpu;
246 }
247
248 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
249 {
250         /* Make sure we're not using the vcpu anymore */
251         hrtimer_cancel(&vcpu->arch.dec_timer);
252         tasklet_kill(&vcpu->arch.tasklet);
253
254         kvmppc_remove_vcpu_debugfs(vcpu);
255         kvmppc_core_vcpu_free(vcpu);
256 }
257
258 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
259 {
260         kvm_arch_vcpu_free(vcpu);
261 }
262
263 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
264 {
265         return kvmppc_core_pending_dec(vcpu);
266 }
267
268 static void kvmppc_decrementer_func(unsigned long data)
269 {
270         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
271
272         kvmppc_core_queue_dec(vcpu);
273
274         if (waitqueue_active(&vcpu->wq)) {
275                 wake_up_interruptible(&vcpu->wq);
276                 vcpu->stat.halt_wakeup++;
277         }
278 }
279
280 /*
281  * low level hrtimer wake routine. Because this runs in hardirq context
282  * we schedule a tasklet to do the real work.
283  */
284 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
285 {
286         struct kvm_vcpu *vcpu;
287
288         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
289         tasklet_schedule(&vcpu->arch.tasklet);
290
291         return HRTIMER_NORESTART;
292 }
293
294 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
295 {
296         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
297         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
298         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
299
300         return 0;
301 }
302
303 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
304 {
305         kvmppc_mmu_destroy(vcpu);
306 }
307
308 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
309 {
310         kvmppc_core_vcpu_load(vcpu, cpu);
311 }
312
313 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
314 {
315         kvmppc_core_vcpu_put(vcpu);
316 }
317
318 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
319                                         struct kvm_guest_debug *dbg)
320 {
321         return -EINVAL;
322 }
323
324 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
325                                      struct kvm_run *run)
326 {
327         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
328 }
329
330 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
331                                       struct kvm_run *run)
332 {
333         u64 uninitialized_var(gpr);
334
335         if (run->mmio.len > sizeof(gpr)) {
336                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
337                 return;
338         }
339
340         if (vcpu->arch.mmio_is_bigendian) {
341                 switch (run->mmio.len) {
342                 case 8: gpr = *(u64 *)run->mmio.data; break;
343                 case 4: gpr = *(u32 *)run->mmio.data; break;
344                 case 2: gpr = *(u16 *)run->mmio.data; break;
345                 case 1: gpr = *(u8 *)run->mmio.data; break;
346                 }
347         } else {
348                 /* Convert BE data from userland back to LE. */
349                 switch (run->mmio.len) {
350                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
351                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
352                 case 1: gpr = *(u8 *)run->mmio.data; break;
353                 }
354         }
355
356         if (vcpu->arch.mmio_sign_extend) {
357                 switch (run->mmio.len) {
358 #ifdef CONFIG_PPC64
359                 case 4:
360                         gpr = (s64)(s32)gpr;
361                         break;
362 #endif
363                 case 2:
364                         gpr = (s64)(s16)gpr;
365                         break;
366                 case 1:
367                         gpr = (s64)(s8)gpr;
368                         break;
369                 }
370         }
371
372         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
373
374         switch (vcpu->arch.io_gpr & KVM_REG_EXT_MASK) {
375         case KVM_REG_GPR:
376                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
377                 break;
378         case KVM_REG_FPR:
379                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
380                 break;
381 #ifdef CONFIG_PPC_BOOK3S
382         case KVM_REG_QPR:
383                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
384                 break;
385         case KVM_REG_FQPR:
386                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
387                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_REG_MASK] = gpr;
388                 break;
389 #endif
390         default:
391                 BUG();
392         }
393 }
394
395 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
396                        unsigned int rt, unsigned int bytes, int is_bigendian)
397 {
398         if (bytes > sizeof(run->mmio.data)) {
399                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
400                        run->mmio.len);
401         }
402
403         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
404         run->mmio.len = bytes;
405         run->mmio.is_write = 0;
406
407         vcpu->arch.io_gpr = rt;
408         vcpu->arch.mmio_is_bigendian = is_bigendian;
409         vcpu->mmio_needed = 1;
410         vcpu->mmio_is_write = 0;
411         vcpu->arch.mmio_sign_extend = 0;
412
413         return EMULATE_DO_MMIO;
414 }
415
416 /* Same as above, but sign extends */
417 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
418                         unsigned int rt, unsigned int bytes, int is_bigendian)
419 {
420         int r;
421
422         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
423         vcpu->arch.mmio_sign_extend = 1;
424
425         return r;
426 }
427
428 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
429                         u64 val, unsigned int bytes, int is_bigendian)
430 {
431         void *data = run->mmio.data;
432
433         if (bytes > sizeof(run->mmio.data)) {
434                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
435                        run->mmio.len);
436         }
437
438         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
439         run->mmio.len = bytes;
440         run->mmio.is_write = 1;
441         vcpu->mmio_needed = 1;
442         vcpu->mmio_is_write = 1;
443
444         /* Store the value at the lowest bytes in 'data'. */
445         if (is_bigendian) {
446                 switch (bytes) {
447                 case 8: *(u64 *)data = val; break;
448                 case 4: *(u32 *)data = val; break;
449                 case 2: *(u16 *)data = val; break;
450                 case 1: *(u8  *)data = val; break;
451                 }
452         } else {
453                 /* Store LE value into 'data'. */
454                 switch (bytes) {
455                 case 4: st_le32(data, val); break;
456                 case 2: st_le16(data, val); break;
457                 case 1: *(u8 *)data = val; break;
458                 }
459         }
460
461         return EMULATE_DO_MMIO;
462 }
463
464 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
465 {
466         int r;
467         sigset_t sigsaved;
468
469         if (vcpu->sigset_active)
470                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
471
472         if (vcpu->mmio_needed) {
473                 if (!vcpu->mmio_is_write)
474                         kvmppc_complete_mmio_load(vcpu, run);
475                 vcpu->mmio_needed = 0;
476         } else if (vcpu->arch.dcr_needed) {
477                 if (!vcpu->arch.dcr_is_write)
478                         kvmppc_complete_dcr_load(vcpu, run);
479                 vcpu->arch.dcr_needed = 0;
480         } else if (vcpu->arch.osi_needed) {
481                 u64 *gprs = run->osi.gprs;
482                 int i;
483
484                 for (i = 0; i < 32; i++)
485                         kvmppc_set_gpr(vcpu, i, gprs[i]);
486                 vcpu->arch.osi_needed = 0;
487         }
488
489         kvmppc_core_deliver_interrupts(vcpu);
490
491         local_irq_disable();
492         kvm_guest_enter();
493         r = __kvmppc_vcpu_run(run, vcpu);
494         kvm_guest_exit();
495         local_irq_enable();
496
497         if (vcpu->sigset_active)
498                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
499
500         return r;
501 }
502
503 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
504 {
505         if (irq->irq == KVM_INTERRUPT_UNSET)
506                 kvmppc_core_dequeue_external(vcpu, irq);
507         else
508                 kvmppc_core_queue_external(vcpu, irq);
509
510         if (waitqueue_active(&vcpu->wq)) {
511                 wake_up_interruptible(&vcpu->wq);
512                 vcpu->stat.halt_wakeup++;
513         }
514
515         return 0;
516 }
517
518 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
519                                      struct kvm_enable_cap *cap)
520 {
521         int r;
522
523         if (cap->flags)
524                 return -EINVAL;
525
526         switch (cap->cap) {
527         case KVM_CAP_PPC_OSI:
528                 r = 0;
529                 vcpu->arch.osi_enabled = true;
530                 break;
531         default:
532                 r = -EINVAL;
533                 break;
534         }
535
536         return r;
537 }
538
539 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
540                                     struct kvm_mp_state *mp_state)
541 {
542         return -EINVAL;
543 }
544
545 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
546                                     struct kvm_mp_state *mp_state)
547 {
548         return -EINVAL;
549 }
550
551 long kvm_arch_vcpu_ioctl(struct file *filp,
552                          unsigned int ioctl, unsigned long arg)
553 {
554         struct kvm_vcpu *vcpu = filp->private_data;
555         void __user *argp = (void __user *)arg;
556         long r;
557
558         switch (ioctl) {
559         case KVM_INTERRUPT: {
560                 struct kvm_interrupt irq;
561                 r = -EFAULT;
562                 if (copy_from_user(&irq, argp, sizeof(irq)))
563                         goto out;
564                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
565                 goto out;
566         }
567
568         case KVM_ENABLE_CAP:
569         {
570                 struct kvm_enable_cap cap;
571                 r = -EFAULT;
572                 if (copy_from_user(&cap, argp, sizeof(cap)))
573                         goto out;
574                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
575                 break;
576         }
577         default:
578                 r = -EINVAL;
579         }
580
581 out:
582         return r;
583 }
584
585 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
586 {
587         u32 inst_lis = 0x3c000000;
588         u32 inst_ori = 0x60000000;
589         u32 inst_nop = 0x60000000;
590         u32 inst_sc = 0x44000002;
591         u32 inst_imm_mask = 0xffff;
592
593         /*
594          * The hypercall to get into KVM from within guest context is as
595          * follows:
596          *
597          *    lis r0, r0, KVM_SC_MAGIC_R0@h
598          *    ori r0, KVM_SC_MAGIC_R0@l
599          *    sc
600          *    nop
601          */
602         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
603         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
604         pvinfo->hcall[2] = inst_sc;
605         pvinfo->hcall[3] = inst_nop;
606
607         return 0;
608 }
609
610 long kvm_arch_vm_ioctl(struct file *filp,
611                        unsigned int ioctl, unsigned long arg)
612 {
613         void __user *argp = (void __user *)arg;
614         long r;
615
616         switch (ioctl) {
617         case KVM_PPC_GET_PVINFO: {
618                 struct kvm_ppc_pvinfo pvinfo;
619                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
620                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
621                         r = -EFAULT;
622                         goto out;
623                 }
624
625                 break;
626         }
627         default:
628                 r = -ENOTTY;
629         }
630
631 out:
632         return r;
633 }
634
635 int kvm_arch_init(void *opaque)
636 {
637         return 0;
638 }
639
640 void kvm_arch_exit(void)
641 {
642 }