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Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.git] / arch / powerpc / kvm / book3s_hv.c
1 /*
2 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
3 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
4 *
5 * Authors:
6 * Paul Mackerras <paulus@au1.ibm.com>
7 * Alexander Graf <agraf@suse.de>
8 * Kevin Wolf <mail@kevin-wolf.de>
9 *
10 * Description: KVM functions specific to running on Book 3S
11 * processors in hypervisor mode (specifically POWER7 and later).
12 *
13 * This file is derived from arch/powerpc/kvm/book3s.c,
14 * by Alexander Graf <agraf@suse.de>.
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License, version 2, as
18 * published by the Free Software Foundation.
19 */
20
21 #include <linux/kvm_host.h>
22 #include <linux/err.h>
23 #include <linux/slab.h>
24 #include <linux/preempt.h>
25 #include <linux/sched/signal.h>
26 #include <linux/sched/stat.h>
27 #include <linux/delay.h>
28 #include <linux/export.h>
29 #include <linux/fs.h>
30 #include <linux/anon_inodes.h>
31 #include <linux/cpu.h>
32 #include <linux/cpumask.h>
33 #include <linux/spinlock.h>
34 #include <linux/page-flags.h>
35 #include <linux/srcu.h>
36 #include <linux/miscdevice.h>
37 #include <linux/debugfs.h>
38 #include <linux/gfp.h>
39 #include <linux/vmalloc.h>
40 #include <linux/highmem.h>
41 #include <linux/hugetlb.h>
42 #include <linux/kvm_irqfd.h>
43 #include <linux/irqbypass.h>
44 #include <linux/module.h>
45 #include <linux/compiler.h>
46 #include <linux/of.h>
47
48 #include <asm/reg.h>
49 #include <asm/cputable.h>
50 #include <asm/cacheflush.h>
51 #include <asm/tlbflush.h>
52 #include <linux/uaccess.h>
53 #include <asm/io.h>
54 #include <asm/kvm_ppc.h>
55 #include <asm/kvm_book3s.h>
56 #include <asm/mmu_context.h>
57 #include <asm/lppaca.h>
58 #include <asm/processor.h>
59 #include <asm/cputhreads.h>
60 #include <asm/page.h>
61 #include <asm/hvcall.h>
62 #include <asm/switch_to.h>
63 #include <asm/smp.h>
64 #include <asm/dbell.h>
65 #include <asm/hmi.h>
66 #include <asm/pnv-pci.h>
67 #include <asm/mmu.h>
68 #include <asm/opal.h>
69 #include <asm/xics.h>
70 #include <asm/xive.h>
71
72 #include "book3s.h"
73
74 #define CREATE_TRACE_POINTS
75 #include "trace_hv.h"
76
77 /* #define EXIT_DEBUG */
78 /* #define EXIT_DEBUG_SIMPLE */
79 /* #define EXIT_DEBUG_INT */
80
81 /* Used to indicate that a guest page fault needs to be handled */
82 #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
83 /* Used to indicate that a guest passthrough interrupt needs to be handled */
84 #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
85
86 /* Used as a "null" value for timebase values */
87 #define TB_NIL (~(u64)0)
88
89 static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
90
91 static int dynamic_mt_modes = 6;
92 module_param(dynamic_mt_modes, int, S_IRUGO | S_IWUSR);
93 MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
94 static int target_smt_mode;
95 module_param(target_smt_mode, int, S_IRUGO | S_IWUSR);
96 MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
97
98 #ifdef CONFIG_KVM_XICS
99 static struct kernel_param_ops module_param_ops = {
100 .set = param_set_int,
101 .get = param_get_int,
102 };
103
104 module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass,
105 S_IRUGO | S_IWUSR);
106 MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
107
108 module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect,
109 S_IRUGO | S_IWUSR);
110 MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
111 #endif
112
113 static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
114 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
115
116 static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
117 int *ip)
118 {
119 int i = *ip;
120 struct kvm_vcpu *vcpu;
121
122 while (++i < MAX_SMT_THREADS) {
123 vcpu = READ_ONCE(vc->runnable_threads[i]);
124 if (vcpu) {
125 *ip = i;
126 return vcpu;
127 }
128 }
129 return NULL;
130 }
131
132 /* Used to traverse the list of runnable threads for a given vcore */
133 #define for_each_runnable_thread(i, vcpu, vc) \
134 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
135
136 static bool kvmppc_ipi_thread(int cpu)
137 {
138 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
139
140 /* On POWER9 we can use msgsnd to IPI any cpu */
141 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
142 msg |= get_hard_smp_processor_id(cpu);
143 smp_mb();
144 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
145 return true;
146 }
147
148 /* On POWER8 for IPIs to threads in the same core, use msgsnd */
149 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
150 preempt_disable();
151 if (cpu_first_thread_sibling(cpu) ==
152 cpu_first_thread_sibling(smp_processor_id())) {
153 msg |= cpu_thread_in_core(cpu);
154 smp_mb();
155 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
156 preempt_enable();
157 return true;
158 }
159 preempt_enable();
160 }
161
162 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
163 if (cpu >= 0 && cpu < nr_cpu_ids) {
164 if (paca[cpu].kvm_hstate.xics_phys) {
165 xics_wake_cpu(cpu);
166 return true;
167 }
168 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
169 return true;
170 }
171 #endif
172
173 return false;
174 }
175
176 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
177 {
178 int cpu;
179 struct swait_queue_head *wqp;
180
181 wqp = kvm_arch_vcpu_wq(vcpu);
182 if (swait_active(wqp)) {
183 swake_up(wqp);
184 ++vcpu->stat.halt_wakeup;
185 }
186
187 cpu = READ_ONCE(vcpu->arch.thread_cpu);
188 if (cpu >= 0 && kvmppc_ipi_thread(cpu))
189 return;
190
191 /* CPU points to the first thread of the core */
192 cpu = vcpu->cpu;
193 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
194 smp_send_reschedule(cpu);
195 }
196
197 /*
198 * We use the vcpu_load/put functions to measure stolen time.
199 * Stolen time is counted as time when either the vcpu is able to
200 * run as part of a virtual core, but the task running the vcore
201 * is preempted or sleeping, or when the vcpu needs something done
202 * in the kernel by the task running the vcpu, but that task is
203 * preempted or sleeping. Those two things have to be counted
204 * separately, since one of the vcpu tasks will take on the job
205 * of running the core, and the other vcpu tasks in the vcore will
206 * sleep waiting for it to do that, but that sleep shouldn't count
207 * as stolen time.
208 *
209 * Hence we accumulate stolen time when the vcpu can run as part of
210 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
211 * needs its task to do other things in the kernel (for example,
212 * service a page fault) in busy_stolen. We don't accumulate
213 * stolen time for a vcore when it is inactive, or for a vcpu
214 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
215 * a misnomer; it means that the vcpu task is not executing in
216 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
217 * the kernel. We don't have any way of dividing up that time
218 * between time that the vcpu is genuinely stopped, time that
219 * the task is actively working on behalf of the vcpu, and time
220 * that the task is preempted, so we don't count any of it as
221 * stolen.
222 *
223 * Updates to busy_stolen are protected by arch.tbacct_lock;
224 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
225 * lock. The stolen times are measured in units of timebase ticks.
226 * (Note that the != TB_NIL checks below are purely defensive;
227 * they should never fail.)
228 */
229
230 static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc)
231 {
232 unsigned long flags;
233
234 spin_lock_irqsave(&vc->stoltb_lock, flags);
235 vc->preempt_tb = mftb();
236 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
237 }
238
239 static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc)
240 {
241 unsigned long flags;
242
243 spin_lock_irqsave(&vc->stoltb_lock, flags);
244 if (vc->preempt_tb != TB_NIL) {
245 vc->stolen_tb += mftb() - vc->preempt_tb;
246 vc->preempt_tb = TB_NIL;
247 }
248 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
249 }
250
251 static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
252 {
253 struct kvmppc_vcore *vc = vcpu->arch.vcore;
254 unsigned long flags;
255
256 /*
257 * We can test vc->runner without taking the vcore lock,
258 * because only this task ever sets vc->runner to this
259 * vcpu, and once it is set to this vcpu, only this task
260 * ever sets it to NULL.
261 */
262 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
263 kvmppc_core_end_stolen(vc);
264
265 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
266 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
267 vcpu->arch.busy_preempt != TB_NIL) {
268 vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
269 vcpu->arch.busy_preempt = TB_NIL;
270 }
271 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
272 }
273
274 static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
275 {
276 struct kvmppc_vcore *vc = vcpu->arch.vcore;
277 unsigned long flags;
278
279 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
280 kvmppc_core_start_stolen(vc);
281
282 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
283 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
284 vcpu->arch.busy_preempt = mftb();
285 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
286 }
287
288 static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
289 {
290 /*
291 * Check for illegal transactional state bit combination
292 * and if we find it, force the TS field to a safe state.
293 */
294 if ((msr & MSR_TS_MASK) == MSR_TS_MASK)
295 msr &= ~MSR_TS_MASK;
296 vcpu->arch.shregs.msr = msr;
297 kvmppc_end_cede(vcpu);
298 }
299
300 static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
301 {
302 vcpu->arch.pvr = pvr;
303 }
304
305 /* Dummy value used in computing PCR value below */
306 #define PCR_ARCH_300 (PCR_ARCH_207 << 1)
307
308 static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
309 {
310 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
311 struct kvmppc_vcore *vc = vcpu->arch.vcore;
312
313 /* We can (emulate) our own architecture version and anything older */
314 if (cpu_has_feature(CPU_FTR_ARCH_300))
315 host_pcr_bit = PCR_ARCH_300;
316 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
317 host_pcr_bit = PCR_ARCH_207;
318 else if (cpu_has_feature(CPU_FTR_ARCH_206))
319 host_pcr_bit = PCR_ARCH_206;
320 else
321 host_pcr_bit = PCR_ARCH_205;
322
323 /* Determine lowest PCR bit needed to run guest in given PVR level */
324 guest_pcr_bit = host_pcr_bit;
325 if (arch_compat) {
326 switch (arch_compat) {
327 case PVR_ARCH_205:
328 guest_pcr_bit = PCR_ARCH_205;
329 break;
330 case PVR_ARCH_206:
331 case PVR_ARCH_206p:
332 guest_pcr_bit = PCR_ARCH_206;
333 break;
334 case PVR_ARCH_207:
335 guest_pcr_bit = PCR_ARCH_207;
336 break;
337 case PVR_ARCH_300:
338 guest_pcr_bit = PCR_ARCH_300;
339 break;
340 default:
341 return -EINVAL;
342 }
343 }
344
345 /* Check requested PCR bits don't exceed our capabilities */
346 if (guest_pcr_bit > host_pcr_bit)
347 return -EINVAL;
348
349 spin_lock(&vc->lock);
350 vc->arch_compat = arch_compat;
351 /* Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit */
352 vc->pcr = host_pcr_bit - guest_pcr_bit;
353 spin_unlock(&vc->lock);
354
355 return 0;
356 }
357
358 static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
359 {
360 int r;
361
362 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
363 pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
364 vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
365 for (r = 0; r < 16; ++r)
366 pr_err("r%2d = %.16lx r%d = %.16lx\n",
367 r, kvmppc_get_gpr(vcpu, r),
368 r+16, kvmppc_get_gpr(vcpu, r+16));
369 pr_err("ctr = %.16lx lr = %.16lx\n",
370 vcpu->arch.ctr, vcpu->arch.lr);
371 pr_err("srr0 = %.16llx srr1 = %.16llx\n",
372 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
373 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
374 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
375 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
376 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
377 pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
378 vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
379 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
380 pr_err("fault dar = %.16lx dsisr = %.8x\n",
381 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
382 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
383 for (r = 0; r < vcpu->arch.slb_max; ++r)
384 pr_err(" ESID = %.16llx VSID = %.16llx\n",
385 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
386 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
387 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
388 vcpu->arch.last_inst);
389 }
390
391 static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
392 {
393 struct kvm_vcpu *ret;
394
395 mutex_lock(&kvm->lock);
396 ret = kvm_get_vcpu_by_id(kvm, id);
397 mutex_unlock(&kvm->lock);
398 return ret;
399 }
400
401 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
402 {
403 vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
404 vpa->yield_count = cpu_to_be32(1);
405 }
406
407 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
408 unsigned long addr, unsigned long len)
409 {
410 /* check address is cacheline aligned */
411 if (addr & (L1_CACHE_BYTES - 1))
412 return -EINVAL;
413 spin_lock(&vcpu->arch.vpa_update_lock);
414 if (v->next_gpa != addr || v->len != len) {
415 v->next_gpa = addr;
416 v->len = addr ? len : 0;
417 v->update_pending = 1;
418 }
419 spin_unlock(&vcpu->arch.vpa_update_lock);
420 return 0;
421 }
422
423 /* Length for a per-processor buffer is passed in at offset 4 in the buffer */
424 struct reg_vpa {
425 u32 dummy;
426 union {
427 __be16 hword;
428 __be32 word;
429 } length;
430 };
431
432 static int vpa_is_registered(struct kvmppc_vpa *vpap)
433 {
434 if (vpap->update_pending)
435 return vpap->next_gpa != 0;
436 return vpap->pinned_addr != NULL;
437 }
438
439 static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
440 unsigned long flags,
441 unsigned long vcpuid, unsigned long vpa)
442 {
443 struct kvm *kvm = vcpu->kvm;
444 unsigned long len, nb;
445 void *va;
446 struct kvm_vcpu *tvcpu;
447 int err;
448 int subfunc;
449 struct kvmppc_vpa *vpap;
450
451 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
452 if (!tvcpu)
453 return H_PARAMETER;
454
455 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
456 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
457 subfunc == H_VPA_REG_SLB) {
458 /* Registering new area - address must be cache-line aligned */
459 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
460 return H_PARAMETER;
461
462 /* convert logical addr to kernel addr and read length */
463 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
464 if (va == NULL)
465 return H_PARAMETER;
466 if (subfunc == H_VPA_REG_VPA)
467 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
468 else
469 len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
470 kvmppc_unpin_guest_page(kvm, va, vpa, false);
471
472 /* Check length */
473 if (len > nb || len < sizeof(struct reg_vpa))
474 return H_PARAMETER;
475 } else {
476 vpa = 0;
477 len = 0;
478 }
479
480 err = H_PARAMETER;
481 vpap = NULL;
482 spin_lock(&tvcpu->arch.vpa_update_lock);
483
484 switch (subfunc) {
485 case H_VPA_REG_VPA: /* register VPA */
486 if (len < sizeof(struct lppaca))
487 break;
488 vpap = &tvcpu->arch.vpa;
489 err = 0;
490 break;
491
492 case H_VPA_REG_DTL: /* register DTL */
493 if (len < sizeof(struct dtl_entry))
494 break;
495 len -= len % sizeof(struct dtl_entry);
496
497 /* Check that they have previously registered a VPA */
498 err = H_RESOURCE;
499 if (!vpa_is_registered(&tvcpu->arch.vpa))
500 break;
501
502 vpap = &tvcpu->arch.dtl;
503 err = 0;
504 break;
505
506 case H_VPA_REG_SLB: /* register SLB shadow buffer */
507 /* Check that they have previously registered a VPA */
508 err = H_RESOURCE;
509 if (!vpa_is_registered(&tvcpu->arch.vpa))
510 break;
511
512 vpap = &tvcpu->arch.slb_shadow;
513 err = 0;
514 break;
515
516 case H_VPA_DEREG_VPA: /* deregister VPA */
517 /* Check they don't still have a DTL or SLB buf registered */
518 err = H_RESOURCE;
519 if (vpa_is_registered(&tvcpu->arch.dtl) ||
520 vpa_is_registered(&tvcpu->arch.slb_shadow))
521 break;
522
523 vpap = &tvcpu->arch.vpa;
524 err = 0;
525 break;
526
527 case H_VPA_DEREG_DTL: /* deregister DTL */
528 vpap = &tvcpu->arch.dtl;
529 err = 0;
530 break;
531
532 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
533 vpap = &tvcpu->arch.slb_shadow;
534 err = 0;
535 break;
536 }
537
538 if (vpap) {
539 vpap->next_gpa = vpa;
540 vpap->len = len;
541 vpap->update_pending = 1;
542 }
543
544 spin_unlock(&tvcpu->arch.vpa_update_lock);
545
546 return err;
547 }
548
549 static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
550 {
551 struct kvm *kvm = vcpu->kvm;
552 void *va;
553 unsigned long nb;
554 unsigned long gpa;
555
556 /*
557 * We need to pin the page pointed to by vpap->next_gpa,
558 * but we can't call kvmppc_pin_guest_page under the lock
559 * as it does get_user_pages() and down_read(). So we
560 * have to drop the lock, pin the page, then get the lock
561 * again and check that a new area didn't get registered
562 * in the meantime.
563 */
564 for (;;) {
565 gpa = vpap->next_gpa;
566 spin_unlock(&vcpu->arch.vpa_update_lock);
567 va = NULL;
568 nb = 0;
569 if (gpa)
570 va = kvmppc_pin_guest_page(kvm, gpa, &nb);
571 spin_lock(&vcpu->arch.vpa_update_lock);
572 if (gpa == vpap->next_gpa)
573 break;
574 /* sigh... unpin that one and try again */
575 if (va)
576 kvmppc_unpin_guest_page(kvm, va, gpa, false);
577 }
578
579 vpap->update_pending = 0;
580 if (va && nb < vpap->len) {
581 /*
582 * If it's now too short, it must be that userspace
583 * has changed the mappings underlying guest memory,
584 * so unregister the region.
585 */
586 kvmppc_unpin_guest_page(kvm, va, gpa, false);
587 va = NULL;
588 }
589 if (vpap->pinned_addr)
590 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
591 vpap->dirty);
592 vpap->gpa = gpa;
593 vpap->pinned_addr = va;
594 vpap->dirty = false;
595 if (va)
596 vpap->pinned_end = va + vpap->len;
597 }
598
599 static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
600 {
601 if (!(vcpu->arch.vpa.update_pending ||
602 vcpu->arch.slb_shadow.update_pending ||
603 vcpu->arch.dtl.update_pending))
604 return;
605
606 spin_lock(&vcpu->arch.vpa_update_lock);
607 if (vcpu->arch.vpa.update_pending) {
608 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
609 if (vcpu->arch.vpa.pinned_addr)
610 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
611 }
612 if (vcpu->arch.dtl.update_pending) {
613 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
614 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
615 vcpu->arch.dtl_index = 0;
616 }
617 if (vcpu->arch.slb_shadow.update_pending)
618 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
619 spin_unlock(&vcpu->arch.vpa_update_lock);
620 }
621
622 /*
623 * Return the accumulated stolen time for the vcore up until `now'.
624 * The caller should hold the vcore lock.
625 */
626 static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
627 {
628 u64 p;
629 unsigned long flags;
630
631 spin_lock_irqsave(&vc->stoltb_lock, flags);
632 p = vc->stolen_tb;
633 if (vc->vcore_state != VCORE_INACTIVE &&
634 vc->preempt_tb != TB_NIL)
635 p += now - vc->preempt_tb;
636 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
637 return p;
638 }
639
640 static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
641 struct kvmppc_vcore *vc)
642 {
643 struct dtl_entry *dt;
644 struct lppaca *vpa;
645 unsigned long stolen;
646 unsigned long core_stolen;
647 u64 now;
648
649 dt = vcpu->arch.dtl_ptr;
650 vpa = vcpu->arch.vpa.pinned_addr;
651 now = mftb();
652 core_stolen = vcore_stolen_time(vc, now);
653 stolen = core_stolen - vcpu->arch.stolen_logged;
654 vcpu->arch.stolen_logged = core_stolen;
655 spin_lock_irq(&vcpu->arch.tbacct_lock);
656 stolen += vcpu->arch.busy_stolen;
657 vcpu->arch.busy_stolen = 0;
658 spin_unlock_irq(&vcpu->arch.tbacct_lock);
659 if (!dt || !vpa)
660 return;
661 memset(dt, 0, sizeof(struct dtl_entry));
662 dt->dispatch_reason = 7;
663 dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
664 dt->timebase = cpu_to_be64(now + vc->tb_offset);
665 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
666 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
667 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
668 ++dt;
669 if (dt == vcpu->arch.dtl.pinned_end)
670 dt = vcpu->arch.dtl.pinned_addr;
671 vcpu->arch.dtl_ptr = dt;
672 /* order writing *dt vs. writing vpa->dtl_idx */
673 smp_wmb();
674 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
675 vcpu->arch.dtl.dirty = true;
676 }
677
678 static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
679 {
680 if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
681 return true;
682 if ((!vcpu->arch.vcore->arch_compat) &&
683 cpu_has_feature(CPU_FTR_ARCH_207S))
684 return true;
685 return false;
686 }
687
688 static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
689 unsigned long resource, unsigned long value1,
690 unsigned long value2)
691 {
692 switch (resource) {
693 case H_SET_MODE_RESOURCE_SET_CIABR:
694 if (!kvmppc_power8_compatible(vcpu))
695 return H_P2;
696 if (value2)
697 return H_P4;
698 if (mflags)
699 return H_UNSUPPORTED_FLAG_START;
700 /* Guests can't breakpoint the hypervisor */
701 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
702 return H_P3;
703 vcpu->arch.ciabr = value1;
704 return H_SUCCESS;
705 case H_SET_MODE_RESOURCE_SET_DAWR:
706 if (!kvmppc_power8_compatible(vcpu))
707 return H_P2;
708 if (mflags)
709 return H_UNSUPPORTED_FLAG_START;
710 if (value2 & DABRX_HYP)
711 return H_P4;
712 vcpu->arch.dawr = value1;
713 vcpu->arch.dawrx = value2;
714 return H_SUCCESS;
715 default:
716 return H_TOO_HARD;
717 }
718 }
719
720 static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
721 {
722 struct kvmppc_vcore *vcore = target->arch.vcore;
723
724 /*
725 * We expect to have been called by the real mode handler
726 * (kvmppc_rm_h_confer()) which would have directly returned
727 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
728 * have useful work to do and should not confer) so we don't
729 * recheck that here.
730 */
731
732 spin_lock(&vcore->lock);
733 if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
734 vcore->vcore_state != VCORE_INACTIVE &&
735 vcore->runner)
736 target = vcore->runner;
737 spin_unlock(&vcore->lock);
738
739 return kvm_vcpu_yield_to(target);
740 }
741
742 static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
743 {
744 int yield_count = 0;
745 struct lppaca *lppaca;
746
747 spin_lock(&vcpu->arch.vpa_update_lock);
748 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
749 if (lppaca)
750 yield_count = be32_to_cpu(lppaca->yield_count);
751 spin_unlock(&vcpu->arch.vpa_update_lock);
752 return yield_count;
753 }
754
755 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
756 {
757 unsigned long req = kvmppc_get_gpr(vcpu, 3);
758 unsigned long target, ret = H_SUCCESS;
759 int yield_count;
760 struct kvm_vcpu *tvcpu;
761 int idx, rc;
762
763 if (req <= MAX_HCALL_OPCODE &&
764 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
765 return RESUME_HOST;
766
767 switch (req) {
768 case H_CEDE:
769 break;
770 case H_PROD:
771 target = kvmppc_get_gpr(vcpu, 4);
772 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
773 if (!tvcpu) {
774 ret = H_PARAMETER;
775 break;
776 }
777 tvcpu->arch.prodded = 1;
778 smp_mb();
779 if (tvcpu->arch.ceded)
780 kvmppc_fast_vcpu_kick_hv(tvcpu);
781 break;
782 case H_CONFER:
783 target = kvmppc_get_gpr(vcpu, 4);
784 if (target == -1)
785 break;
786 tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
787 if (!tvcpu) {
788 ret = H_PARAMETER;
789 break;
790 }
791 yield_count = kvmppc_get_gpr(vcpu, 5);
792 if (kvmppc_get_yield_count(tvcpu) != yield_count)
793 break;
794 kvm_arch_vcpu_yield_to(tvcpu);
795 break;
796 case H_REGISTER_VPA:
797 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
798 kvmppc_get_gpr(vcpu, 5),
799 kvmppc_get_gpr(vcpu, 6));
800 break;
801 case H_RTAS:
802 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
803 return RESUME_HOST;
804
805 idx = srcu_read_lock(&vcpu->kvm->srcu);
806 rc = kvmppc_rtas_hcall(vcpu);
807 srcu_read_unlock(&vcpu->kvm->srcu, idx);
808
809 if (rc == -ENOENT)
810 return RESUME_HOST;
811 else if (rc == 0)
812 break;
813
814 /* Send the error out to userspace via KVM_RUN */
815 return rc;
816 case H_LOGICAL_CI_LOAD:
817 ret = kvmppc_h_logical_ci_load(vcpu);
818 if (ret == H_TOO_HARD)
819 return RESUME_HOST;
820 break;
821 case H_LOGICAL_CI_STORE:
822 ret = kvmppc_h_logical_ci_store(vcpu);
823 if (ret == H_TOO_HARD)
824 return RESUME_HOST;
825 break;
826 case H_SET_MODE:
827 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
828 kvmppc_get_gpr(vcpu, 5),
829 kvmppc_get_gpr(vcpu, 6),
830 kvmppc_get_gpr(vcpu, 7));
831 if (ret == H_TOO_HARD)
832 return RESUME_HOST;
833 break;
834 case H_XIRR:
835 case H_CPPR:
836 case H_EOI:
837 case H_IPI:
838 case H_IPOLL:
839 case H_XIRR_X:
840 if (kvmppc_xics_enabled(vcpu)) {
841 if (xive_enabled()) {
842 ret = H_NOT_AVAILABLE;
843 return RESUME_GUEST;
844 }
845 ret = kvmppc_xics_hcall(vcpu, req);
846 break;
847 }
848 return RESUME_HOST;
849 case H_PUT_TCE:
850 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
851 kvmppc_get_gpr(vcpu, 5),
852 kvmppc_get_gpr(vcpu, 6));
853 if (ret == H_TOO_HARD)
854 return RESUME_HOST;
855 break;
856 case H_PUT_TCE_INDIRECT:
857 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
858 kvmppc_get_gpr(vcpu, 5),
859 kvmppc_get_gpr(vcpu, 6),
860 kvmppc_get_gpr(vcpu, 7));
861 if (ret == H_TOO_HARD)
862 return RESUME_HOST;
863 break;
864 case H_STUFF_TCE:
865 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
866 kvmppc_get_gpr(vcpu, 5),
867 kvmppc_get_gpr(vcpu, 6),
868 kvmppc_get_gpr(vcpu, 7));
869 if (ret == H_TOO_HARD)
870 return RESUME_HOST;
871 break;
872 default:
873 return RESUME_HOST;
874 }
875 kvmppc_set_gpr(vcpu, 3, ret);
876 vcpu->arch.hcall_needed = 0;
877 return RESUME_GUEST;
878 }
879
880 static int kvmppc_hcall_impl_hv(unsigned long cmd)
881 {
882 switch (cmd) {
883 case H_CEDE:
884 case H_PROD:
885 case H_CONFER:
886 case H_REGISTER_VPA:
887 case H_SET_MODE:
888 case H_LOGICAL_CI_LOAD:
889 case H_LOGICAL_CI_STORE:
890 #ifdef CONFIG_KVM_XICS
891 case H_XIRR:
892 case H_CPPR:
893 case H_EOI:
894 case H_IPI:
895 case H_IPOLL:
896 case H_XIRR_X:
897 #endif
898 return 1;
899 }
900
901 /* See if it's in the real-mode table */
902 return kvmppc_hcall_impl_hv_realmode(cmd);
903 }
904
905 static int kvmppc_emulate_debug_inst(struct kvm_run *run,
906 struct kvm_vcpu *vcpu)
907 {
908 u32 last_inst;
909
910 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
911 EMULATE_DONE) {
912 /*
913 * Fetch failed, so return to guest and
914 * try executing it again.
915 */
916 return RESUME_GUEST;
917 }
918
919 if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
920 run->exit_reason = KVM_EXIT_DEBUG;
921 run->debug.arch.address = kvmppc_get_pc(vcpu);
922 return RESUME_HOST;
923 } else {
924 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
925 return RESUME_GUEST;
926 }
927 }
928
929 static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
930 struct task_struct *tsk)
931 {
932 int r = RESUME_HOST;
933
934 vcpu->stat.sum_exits++;
935
936 /*
937 * This can happen if an interrupt occurs in the last stages
938 * of guest entry or the first stages of guest exit (i.e. after
939 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
940 * and before setting it to KVM_GUEST_MODE_HOST_HV).
941 * That can happen due to a bug, or due to a machine check
942 * occurring at just the wrong time.
943 */
944 if (vcpu->arch.shregs.msr & MSR_HV) {
945 printk(KERN_EMERG "KVM trap in HV mode!\n");
946 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
947 vcpu->arch.trap, kvmppc_get_pc(vcpu),
948 vcpu->arch.shregs.msr);
949 kvmppc_dump_regs(vcpu);
950 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
951 run->hw.hardware_exit_reason = vcpu->arch.trap;
952 return RESUME_HOST;
953 }
954 run->exit_reason = KVM_EXIT_UNKNOWN;
955 run->ready_for_interrupt_injection = 1;
956 switch (vcpu->arch.trap) {
957 /* We're good on these - the host merely wanted to get our attention */
958 case BOOK3S_INTERRUPT_HV_DECREMENTER:
959 vcpu->stat.dec_exits++;
960 r = RESUME_GUEST;
961 break;
962 case BOOK3S_INTERRUPT_EXTERNAL:
963 case BOOK3S_INTERRUPT_H_DOORBELL:
964 case BOOK3S_INTERRUPT_H_VIRT:
965 vcpu->stat.ext_intr_exits++;
966 r = RESUME_GUEST;
967 break;
968 /* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
969 case BOOK3S_INTERRUPT_HMI:
970 case BOOK3S_INTERRUPT_PERFMON:
971 r = RESUME_GUEST;
972 break;
973 case BOOK3S_INTERRUPT_MACHINE_CHECK:
974 /*
975 * Deliver a machine check interrupt to the guest.
976 * We have to do this, even if the host has handled the
977 * machine check, because machine checks use SRR0/1 and
978 * the interrupt might have trashed guest state in them.
979 */
980 kvmppc_book3s_queue_irqprio(vcpu,
981 BOOK3S_INTERRUPT_MACHINE_CHECK);
982 r = RESUME_GUEST;
983 break;
984 case BOOK3S_INTERRUPT_PROGRAM:
985 {
986 ulong flags;
987 /*
988 * Normally program interrupts are delivered directly
989 * to the guest by the hardware, but we can get here
990 * as a result of a hypervisor emulation interrupt
991 * (e40) getting turned into a 700 by BML RTAS.
992 */
993 flags = vcpu->arch.shregs.msr & 0x1f0000ull;
994 kvmppc_core_queue_program(vcpu, flags);
995 r = RESUME_GUEST;
996 break;
997 }
998 case BOOK3S_INTERRUPT_SYSCALL:
999 {
1000 /* hcall - punt to userspace */
1001 int i;
1002
1003 /* hypercall with MSR_PR has already been handled in rmode,
1004 * and never reaches here.
1005 */
1006
1007 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
1008 for (i = 0; i < 9; ++i)
1009 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
1010 run->exit_reason = KVM_EXIT_PAPR_HCALL;
1011 vcpu->arch.hcall_needed = 1;
1012 r = RESUME_HOST;
1013 break;
1014 }
1015 /*
1016 * We get these next two if the guest accesses a page which it thinks
1017 * it has mapped but which is not actually present, either because
1018 * it is for an emulated I/O device or because the corresonding
1019 * host page has been paged out. Any other HDSI/HISI interrupts
1020 * have been handled already.
1021 */
1022 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
1023 r = RESUME_PAGE_FAULT;
1024 break;
1025 case BOOK3S_INTERRUPT_H_INST_STORAGE:
1026 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1027 vcpu->arch.fault_dsisr = 0;
1028 r = RESUME_PAGE_FAULT;
1029 break;
1030 /*
1031 * This occurs if the guest executes an illegal instruction.
1032 * If the guest debug is disabled, generate a program interrupt
1033 * to the guest. If guest debug is enabled, we need to check
1034 * whether the instruction is a software breakpoint instruction.
1035 * Accordingly return to Guest or Host.
1036 */
1037 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1038 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
1039 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
1040 swab32(vcpu->arch.emul_inst) :
1041 vcpu->arch.emul_inst;
1042 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
1043 r = kvmppc_emulate_debug_inst(run, vcpu);
1044 } else {
1045 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1046 r = RESUME_GUEST;
1047 }
1048 break;
1049 /*
1050 * This occurs if the guest (kernel or userspace), does something that
1051 * is prohibited by HFSCR. We just generate a program interrupt to
1052 * the guest.
1053 */
1054 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
1055 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
1056 r = RESUME_GUEST;
1057 break;
1058 case BOOK3S_INTERRUPT_HV_RM_HARD:
1059 r = RESUME_PASSTHROUGH;
1060 break;
1061 default:
1062 kvmppc_dump_regs(vcpu);
1063 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
1064 vcpu->arch.trap, kvmppc_get_pc(vcpu),
1065 vcpu->arch.shregs.msr);
1066 run->hw.hardware_exit_reason = vcpu->arch.trap;
1067 r = RESUME_HOST;
1068 break;
1069 }
1070
1071 return r;
1072 }
1073
1074 static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
1075 struct kvm_sregs *sregs)
1076 {
1077 int i;
1078
1079 memset(sregs, 0, sizeof(struct kvm_sregs));
1080 sregs->pvr = vcpu->arch.pvr;
1081 for (i = 0; i < vcpu->arch.slb_max; i++) {
1082 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
1083 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1084 }
1085
1086 return 0;
1087 }
1088
1089 static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
1090 struct kvm_sregs *sregs)
1091 {
1092 int i, j;
1093
1094 /* Only accept the same PVR as the host's, since we can't spoof it */
1095 if (sregs->pvr != vcpu->arch.pvr)
1096 return -EINVAL;
1097
1098 j = 0;
1099 for (i = 0; i < vcpu->arch.slb_nr; i++) {
1100 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
1101 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
1102 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
1103 ++j;
1104 }
1105 }
1106 vcpu->arch.slb_max = j;
1107
1108 return 0;
1109 }
1110
1111 static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
1112 bool preserve_top32)
1113 {
1114 struct kvm *kvm = vcpu->kvm;
1115 struct kvmppc_vcore *vc = vcpu->arch.vcore;
1116 u64 mask;
1117
1118 mutex_lock(&kvm->lock);
1119 spin_lock(&vc->lock);
1120 /*
1121 * If ILE (interrupt little-endian) has changed, update the
1122 * MSR_LE bit in the intr_msr for each vcpu in this vcore.
1123 */
1124 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
1125 struct kvm_vcpu *vcpu;
1126 int i;
1127
1128 kvm_for_each_vcpu(i, vcpu, kvm) {
1129 if (vcpu->arch.vcore != vc)
1130 continue;
1131 if (new_lpcr & LPCR_ILE)
1132 vcpu->arch.intr_msr |= MSR_LE;
1133 else
1134 vcpu->arch.intr_msr &= ~MSR_LE;
1135 }
1136 }
1137
1138 /*
1139 * Userspace can only modify DPFD (default prefetch depth),
1140 * ILE (interrupt little-endian) and TC (translation control).
1141 * On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
1142 */
1143 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
1144 if (cpu_has_feature(CPU_FTR_ARCH_207S))
1145 mask |= LPCR_AIL;
1146
1147 /* Broken 32-bit version of LPCR must not clear top bits */
1148 if (preserve_top32)
1149 mask &= 0xFFFFFFFF;
1150 vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
1151 spin_unlock(&vc->lock);
1152 mutex_unlock(&kvm->lock);
1153 }
1154
1155 static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1156 union kvmppc_one_reg *val)
1157 {
1158 int r = 0;
1159 long int i;
1160
1161 switch (id) {
1162 case KVM_REG_PPC_DEBUG_INST:
1163 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1164 break;
1165 case KVM_REG_PPC_HIOR:
1166 *val = get_reg_val(id, 0);
1167 break;
1168 case KVM_REG_PPC_DABR:
1169 *val = get_reg_val(id, vcpu->arch.dabr);
1170 break;
1171 case KVM_REG_PPC_DABRX:
1172 *val = get_reg_val(id, vcpu->arch.dabrx);
1173 break;
1174 case KVM_REG_PPC_DSCR:
1175 *val = get_reg_val(id, vcpu->arch.dscr);
1176 break;
1177 case KVM_REG_PPC_PURR:
1178 *val = get_reg_val(id, vcpu->arch.purr);
1179 break;
1180 case KVM_REG_PPC_SPURR:
1181 *val = get_reg_val(id, vcpu->arch.spurr);
1182 break;
1183 case KVM_REG_PPC_AMR:
1184 *val = get_reg_val(id, vcpu->arch.amr);
1185 break;
1186 case KVM_REG_PPC_UAMOR:
1187 *val = get_reg_val(id, vcpu->arch.uamor);
1188 break;
1189 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1190 i = id - KVM_REG_PPC_MMCR0;
1191 *val = get_reg_val(id, vcpu->arch.mmcr[i]);
1192 break;
1193 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1194 i = id - KVM_REG_PPC_PMC1;
1195 *val = get_reg_val(id, vcpu->arch.pmc[i]);
1196 break;
1197 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1198 i = id - KVM_REG_PPC_SPMC1;
1199 *val = get_reg_val(id, vcpu->arch.spmc[i]);
1200 break;
1201 case KVM_REG_PPC_SIAR:
1202 *val = get_reg_val(id, vcpu->arch.siar);
1203 break;
1204 case KVM_REG_PPC_SDAR:
1205 *val = get_reg_val(id, vcpu->arch.sdar);
1206 break;
1207 case KVM_REG_PPC_SIER:
1208 *val = get_reg_val(id, vcpu->arch.sier);
1209 break;
1210 case KVM_REG_PPC_IAMR:
1211 *val = get_reg_val(id, vcpu->arch.iamr);
1212 break;
1213 case KVM_REG_PPC_PSPB:
1214 *val = get_reg_val(id, vcpu->arch.pspb);
1215 break;
1216 case KVM_REG_PPC_DPDES:
1217 *val = get_reg_val(id, vcpu->arch.vcore->dpdes);
1218 break;
1219 case KVM_REG_PPC_VTB:
1220 *val = get_reg_val(id, vcpu->arch.vcore->vtb);
1221 break;
1222 case KVM_REG_PPC_DAWR:
1223 *val = get_reg_val(id, vcpu->arch.dawr);
1224 break;
1225 case KVM_REG_PPC_DAWRX:
1226 *val = get_reg_val(id, vcpu->arch.dawrx);
1227 break;
1228 case KVM_REG_PPC_CIABR:
1229 *val = get_reg_val(id, vcpu->arch.ciabr);
1230 break;
1231 case KVM_REG_PPC_CSIGR:
1232 *val = get_reg_val(id, vcpu->arch.csigr);
1233 break;
1234 case KVM_REG_PPC_TACR:
1235 *val = get_reg_val(id, vcpu->arch.tacr);
1236 break;
1237 case KVM_REG_PPC_TCSCR:
1238 *val = get_reg_val(id, vcpu->arch.tcscr);
1239 break;
1240 case KVM_REG_PPC_PID:
1241 *val = get_reg_val(id, vcpu->arch.pid);
1242 break;
1243 case KVM_REG_PPC_ACOP:
1244 *val = get_reg_val(id, vcpu->arch.acop);
1245 break;
1246 case KVM_REG_PPC_WORT:
1247 *val = get_reg_val(id, vcpu->arch.wort);
1248 break;
1249 case KVM_REG_PPC_TIDR:
1250 *val = get_reg_val(id, vcpu->arch.tid);
1251 break;
1252 case KVM_REG_PPC_PSSCR:
1253 *val = get_reg_val(id, vcpu->arch.psscr);
1254 break;
1255 case KVM_REG_PPC_VPA_ADDR:
1256 spin_lock(&vcpu->arch.vpa_update_lock);
1257 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
1258 spin_unlock(&vcpu->arch.vpa_update_lock);
1259 break;
1260 case KVM_REG_PPC_VPA_SLB:
1261 spin_lock(&vcpu->arch.vpa_update_lock);
1262 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
1263 val->vpaval.length = vcpu->arch.slb_shadow.len;
1264 spin_unlock(&vcpu->arch.vpa_update_lock);
1265 break;
1266 case KVM_REG_PPC_VPA_DTL:
1267 spin_lock(&vcpu->arch.vpa_update_lock);
1268 val->vpaval.addr = vcpu->arch.dtl.next_gpa;
1269 val->vpaval.length = vcpu->arch.dtl.len;
1270 spin_unlock(&vcpu->arch.vpa_update_lock);
1271 break;
1272 case KVM_REG_PPC_TB_OFFSET:
1273 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
1274 break;
1275 case KVM_REG_PPC_LPCR:
1276 case KVM_REG_PPC_LPCR_64:
1277 *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
1278 break;
1279 case KVM_REG_PPC_PPR:
1280 *val = get_reg_val(id, vcpu->arch.ppr);
1281 break;
1282 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1283 case KVM_REG_PPC_TFHAR:
1284 *val = get_reg_val(id, vcpu->arch.tfhar);
1285 break;
1286 case KVM_REG_PPC_TFIAR:
1287 *val = get_reg_val(id, vcpu->arch.tfiar);
1288 break;
1289 case KVM_REG_PPC_TEXASR:
1290 *val = get_reg_val(id, vcpu->arch.texasr);
1291 break;
1292 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1293 i = id - KVM_REG_PPC_TM_GPR0;
1294 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
1295 break;
1296 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1297 {
1298 int j;
1299 i = id - KVM_REG_PPC_TM_VSR0;
1300 if (i < 32)
1301 for (j = 0; j < TS_FPRWIDTH; j++)
1302 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
1303 else {
1304 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1305 val->vval = vcpu->arch.vr_tm.vr[i-32];
1306 else
1307 r = -ENXIO;
1308 }
1309 break;
1310 }
1311 case KVM_REG_PPC_TM_CR:
1312 *val = get_reg_val(id, vcpu->arch.cr_tm);
1313 break;
1314 case KVM_REG_PPC_TM_XER:
1315 *val = get_reg_val(id, vcpu->arch.xer_tm);
1316 break;
1317 case KVM_REG_PPC_TM_LR:
1318 *val = get_reg_val(id, vcpu->arch.lr_tm);
1319 break;
1320 case KVM_REG_PPC_TM_CTR:
1321 *val = get_reg_val(id, vcpu->arch.ctr_tm);
1322 break;
1323 case KVM_REG_PPC_TM_FPSCR:
1324 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
1325 break;
1326 case KVM_REG_PPC_TM_AMR:
1327 *val = get_reg_val(id, vcpu->arch.amr_tm);
1328 break;
1329 case KVM_REG_PPC_TM_PPR:
1330 *val = get_reg_val(id, vcpu->arch.ppr_tm);
1331 break;
1332 case KVM_REG_PPC_TM_VRSAVE:
1333 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
1334 break;
1335 case KVM_REG_PPC_TM_VSCR:
1336 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1337 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
1338 else
1339 r = -ENXIO;
1340 break;
1341 case KVM_REG_PPC_TM_DSCR:
1342 *val = get_reg_val(id, vcpu->arch.dscr_tm);
1343 break;
1344 case KVM_REG_PPC_TM_TAR:
1345 *val = get_reg_val(id, vcpu->arch.tar_tm);
1346 break;
1347 #endif
1348 case KVM_REG_PPC_ARCH_COMPAT:
1349 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
1350 break;
1351 default:
1352 r = -EINVAL;
1353 break;
1354 }
1355
1356 return r;
1357 }
1358
1359 static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1360 union kvmppc_one_reg *val)
1361 {
1362 int r = 0;
1363 long int i;
1364 unsigned long addr, len;
1365
1366 switch (id) {
1367 case KVM_REG_PPC_HIOR:
1368 /* Only allow this to be set to zero */
1369 if (set_reg_val(id, *val))
1370 r = -EINVAL;
1371 break;
1372 case KVM_REG_PPC_DABR:
1373 vcpu->arch.dabr = set_reg_val(id, *val);
1374 break;
1375 case KVM_REG_PPC_DABRX:
1376 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
1377 break;
1378 case KVM_REG_PPC_DSCR:
1379 vcpu->arch.dscr = set_reg_val(id, *val);
1380 break;
1381 case KVM_REG_PPC_PURR:
1382 vcpu->arch.purr = set_reg_val(id, *val);
1383 break;
1384 case KVM_REG_PPC_SPURR:
1385 vcpu->arch.spurr = set_reg_val(id, *val);
1386 break;
1387 case KVM_REG_PPC_AMR:
1388 vcpu->arch.amr = set_reg_val(id, *val);
1389 break;
1390 case KVM_REG_PPC_UAMOR:
1391 vcpu->arch.uamor = set_reg_val(id, *val);
1392 break;
1393 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1394 i = id - KVM_REG_PPC_MMCR0;
1395 vcpu->arch.mmcr[i] = set_reg_val(id, *val);
1396 break;
1397 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
1398 i = id - KVM_REG_PPC_PMC1;
1399 vcpu->arch.pmc[i] = set_reg_val(id, *val);
1400 break;
1401 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
1402 i = id - KVM_REG_PPC_SPMC1;
1403 vcpu->arch.spmc[i] = set_reg_val(id, *val);
1404 break;
1405 case KVM_REG_PPC_SIAR:
1406 vcpu->arch.siar = set_reg_val(id, *val);
1407 break;
1408 case KVM_REG_PPC_SDAR:
1409 vcpu->arch.sdar = set_reg_val(id, *val);
1410 break;
1411 case KVM_REG_PPC_SIER:
1412 vcpu->arch.sier = set_reg_val(id, *val);
1413 break;
1414 case KVM_REG_PPC_IAMR:
1415 vcpu->arch.iamr = set_reg_val(id, *val);
1416 break;
1417 case KVM_REG_PPC_PSPB:
1418 vcpu->arch.pspb = set_reg_val(id, *val);
1419 break;
1420 case KVM_REG_PPC_DPDES:
1421 vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
1422 break;
1423 case KVM_REG_PPC_VTB:
1424 vcpu->arch.vcore->vtb = set_reg_val(id, *val);
1425 break;
1426 case KVM_REG_PPC_DAWR:
1427 vcpu->arch.dawr = set_reg_val(id, *val);
1428 break;
1429 case KVM_REG_PPC_DAWRX:
1430 vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
1431 break;
1432 case KVM_REG_PPC_CIABR:
1433 vcpu->arch.ciabr = set_reg_val(id, *val);
1434 /* Don't allow setting breakpoints in hypervisor code */
1435 if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
1436 vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
1437 break;
1438 case KVM_REG_PPC_CSIGR:
1439 vcpu->arch.csigr = set_reg_val(id, *val);
1440 break;
1441 case KVM_REG_PPC_TACR:
1442 vcpu->arch.tacr = set_reg_val(id, *val);
1443 break;
1444 case KVM_REG_PPC_TCSCR:
1445 vcpu->arch.tcscr = set_reg_val(id, *val);
1446 break;
1447 case KVM_REG_PPC_PID:
1448 vcpu->arch.pid = set_reg_val(id, *val);
1449 break;
1450 case KVM_REG_PPC_ACOP:
1451 vcpu->arch.acop = set_reg_val(id, *val);
1452 break;
1453 case KVM_REG_PPC_WORT:
1454 vcpu->arch.wort = set_reg_val(id, *val);
1455 break;
1456 case KVM_REG_PPC_TIDR:
1457 vcpu->arch.tid = set_reg_val(id, *val);
1458 break;
1459 case KVM_REG_PPC_PSSCR:
1460 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
1461 break;
1462 case KVM_REG_PPC_VPA_ADDR:
1463 addr = set_reg_val(id, *val);
1464 r = -EINVAL;
1465 if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
1466 vcpu->arch.dtl.next_gpa))
1467 break;
1468 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
1469 break;
1470 case KVM_REG_PPC_VPA_SLB:
1471 addr = val->vpaval.addr;
1472 len = val->vpaval.length;
1473 r = -EINVAL;
1474 if (addr && !vcpu->arch.vpa.next_gpa)
1475 break;
1476 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
1477 break;
1478 case KVM_REG_PPC_VPA_DTL:
1479 addr = val->vpaval.addr;
1480 len = val->vpaval.length;
1481 r = -EINVAL;
1482 if (addr && (len < sizeof(struct dtl_entry) ||
1483 !vcpu->arch.vpa.next_gpa))
1484 break;
1485 len -= len % sizeof(struct dtl_entry);
1486 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
1487 break;
1488 case KVM_REG_PPC_TB_OFFSET:
1489 /*
1490 * POWER9 DD1 has an erratum where writing TBU40 causes
1491 * the timebase to lose ticks. So we don't let the
1492 * timebase offset be changed on P9 DD1. (It is
1493 * initialized to zero.)
1494 */
1495 if (cpu_has_feature(CPU_FTR_POWER9_DD1))
1496 break;
1497 /* round up to multiple of 2^24 */
1498 vcpu->arch.vcore->tb_offset =
1499 ALIGN(set_reg_val(id, *val), 1UL << 24);
1500 break;
1501 case KVM_REG_PPC_LPCR:
1502 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
1503 break;
1504 case KVM_REG_PPC_LPCR_64:
1505 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
1506 break;
1507 case KVM_REG_PPC_PPR:
1508 vcpu->arch.ppr = set_reg_val(id, *val);
1509 break;
1510 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1511 case KVM_REG_PPC_TFHAR:
1512 vcpu->arch.tfhar = set_reg_val(id, *val);
1513 break;
1514 case KVM_REG_PPC_TFIAR:
1515 vcpu->arch.tfiar = set_reg_val(id, *val);
1516 break;
1517 case KVM_REG_PPC_TEXASR:
1518 vcpu->arch.texasr = set_reg_val(id, *val);
1519 break;
1520 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1521 i = id - KVM_REG_PPC_TM_GPR0;
1522 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
1523 break;
1524 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1525 {
1526 int j;
1527 i = id - KVM_REG_PPC_TM_VSR0;
1528 if (i < 32)
1529 for (j = 0; j < TS_FPRWIDTH; j++)
1530 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
1531 else
1532 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1533 vcpu->arch.vr_tm.vr[i-32] = val->vval;
1534 else
1535 r = -ENXIO;
1536 break;
1537 }
1538 case KVM_REG_PPC_TM_CR:
1539 vcpu->arch.cr_tm = set_reg_val(id, *val);
1540 break;
1541 case KVM_REG_PPC_TM_XER:
1542 vcpu->arch.xer_tm = set_reg_val(id, *val);
1543 break;
1544 case KVM_REG_PPC_TM_LR:
1545 vcpu->arch.lr_tm = set_reg_val(id, *val);
1546 break;
1547 case KVM_REG_PPC_TM_CTR:
1548 vcpu->arch.ctr_tm = set_reg_val(id, *val);
1549 break;
1550 case KVM_REG_PPC_TM_FPSCR:
1551 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
1552 break;
1553 case KVM_REG_PPC_TM_AMR:
1554 vcpu->arch.amr_tm = set_reg_val(id, *val);
1555 break;
1556 case KVM_REG_PPC_TM_PPR:
1557 vcpu->arch.ppr_tm = set_reg_val(id, *val);
1558 break;
1559 case KVM_REG_PPC_TM_VRSAVE:
1560 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
1561 break;
1562 case KVM_REG_PPC_TM_VSCR:
1563 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1564 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
1565 else
1566 r = - ENXIO;
1567 break;
1568 case KVM_REG_PPC_TM_DSCR:
1569 vcpu->arch.dscr_tm = set_reg_val(id, *val);
1570 break;
1571 case KVM_REG_PPC_TM_TAR:
1572 vcpu->arch.tar_tm = set_reg_val(id, *val);
1573 break;
1574 #endif
1575 case KVM_REG_PPC_ARCH_COMPAT:
1576 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
1577 break;
1578 default:
1579 r = -EINVAL;
1580 break;
1581 }
1582
1583 return r;
1584 }
1585
1586 /*
1587 * On POWER9, threads are independent and can be in different partitions.
1588 * Therefore we consider each thread to be a subcore.
1589 * There is a restriction that all threads have to be in the same
1590 * MMU mode (radix or HPT), unfortunately, but since we only support
1591 * HPT guests on a HPT host so far, that isn't an impediment yet.
1592 */
1593 static int threads_per_vcore(void)
1594 {
1595 if (cpu_has_feature(CPU_FTR_ARCH_300))
1596 return 1;
1597 return threads_per_subcore;
1598 }
1599
1600 static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
1601 {
1602 struct kvmppc_vcore *vcore;
1603
1604 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
1605
1606 if (vcore == NULL)
1607 return NULL;
1608
1609 spin_lock_init(&vcore->lock);
1610 spin_lock_init(&vcore->stoltb_lock);
1611 init_swait_queue_head(&vcore->wq);
1612 vcore->preempt_tb = TB_NIL;
1613 vcore->lpcr = kvm->arch.lpcr;
1614 vcore->first_vcpuid = core * threads_per_vcore();
1615 vcore->kvm = kvm;
1616 INIT_LIST_HEAD(&vcore->preempt_list);
1617
1618 return vcore;
1619 }
1620
1621 #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
1622 static struct debugfs_timings_element {
1623 const char *name;
1624 size_t offset;
1625 } timings[] = {
1626 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
1627 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
1628 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
1629 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
1630 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
1631 };
1632
1633 #define N_TIMINGS (sizeof(timings) / sizeof(timings[0]))
1634
1635 struct debugfs_timings_state {
1636 struct kvm_vcpu *vcpu;
1637 unsigned int buflen;
1638 char buf[N_TIMINGS * 100];
1639 };
1640
1641 static int debugfs_timings_open(struct inode *inode, struct file *file)
1642 {
1643 struct kvm_vcpu *vcpu = inode->i_private;
1644 struct debugfs_timings_state *p;
1645
1646 p = kzalloc(sizeof(*p), GFP_KERNEL);
1647 if (!p)
1648 return -ENOMEM;
1649
1650 kvm_get_kvm(vcpu->kvm);
1651 p->vcpu = vcpu;
1652 file->private_data = p;
1653
1654 return nonseekable_open(inode, file);
1655 }
1656
1657 static int debugfs_timings_release(struct inode *inode, struct file *file)
1658 {
1659 struct debugfs_timings_state *p = file->private_data;
1660
1661 kvm_put_kvm(p->vcpu->kvm);
1662 kfree(p);
1663 return 0;
1664 }
1665
1666 static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
1667 size_t len, loff_t *ppos)
1668 {
1669 struct debugfs_timings_state *p = file->private_data;
1670 struct kvm_vcpu *vcpu = p->vcpu;
1671 char *s, *buf_end;
1672 struct kvmhv_tb_accumulator tb;
1673 u64 count;
1674 loff_t pos;
1675 ssize_t n;
1676 int i, loops;
1677 bool ok;
1678
1679 if (!p->buflen) {
1680 s = p->buf;
1681 buf_end = s + sizeof(p->buf);
1682 for (i = 0; i < N_TIMINGS; ++i) {
1683 struct kvmhv_tb_accumulator *acc;
1684
1685 acc = (struct kvmhv_tb_accumulator *)
1686 ((unsigned long)vcpu + timings[i].offset);
1687 ok = false;
1688 for (loops = 0; loops < 1000; ++loops) {
1689 count = acc->seqcount;
1690 if (!(count & 1)) {
1691 smp_rmb();
1692 tb = *acc;
1693 smp_rmb();
1694 if (count == acc->seqcount) {
1695 ok = true;
1696 break;
1697 }
1698 }
1699 udelay(1);
1700 }
1701 if (!ok)
1702 snprintf(s, buf_end - s, "%s: stuck\n",
1703 timings[i].name);
1704 else
1705 snprintf(s, buf_end - s,
1706 "%s: %llu %llu %llu %llu\n",
1707 timings[i].name, count / 2,
1708 tb_to_ns(tb.tb_total),
1709 tb_to_ns(tb.tb_min),
1710 tb_to_ns(tb.tb_max));
1711 s += strlen(s);
1712 }
1713 p->buflen = s - p->buf;
1714 }
1715
1716 pos = *ppos;
1717 if (pos >= p->buflen)
1718 return 0;
1719 if (len > p->buflen - pos)
1720 len = p->buflen - pos;
1721 n = copy_to_user(buf, p->buf + pos, len);
1722 if (n) {
1723 if (n == len)
1724 return -EFAULT;
1725 len -= n;
1726 }
1727 *ppos = pos + len;
1728 return len;
1729 }
1730
1731 static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
1732 size_t len, loff_t *ppos)
1733 {
1734 return -EACCES;
1735 }
1736
1737 static const struct file_operations debugfs_timings_ops = {
1738 .owner = THIS_MODULE,
1739 .open = debugfs_timings_open,
1740 .release = debugfs_timings_release,
1741 .read = debugfs_timings_read,
1742 .write = debugfs_timings_write,
1743 .llseek = generic_file_llseek,
1744 };
1745
1746 /* Create a debugfs directory for the vcpu */
1747 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
1748 {
1749 char buf[16];
1750 struct kvm *kvm = vcpu->kvm;
1751
1752 snprintf(buf, sizeof(buf), "vcpu%u", id);
1753 if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
1754 return;
1755 vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
1756 if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
1757 return;
1758 vcpu->arch.debugfs_timings =
1759 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
1760 vcpu, &debugfs_timings_ops);
1761 }
1762
1763 #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
1764 static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
1765 {
1766 }
1767 #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
1768
1769 static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
1770 unsigned int id)
1771 {
1772 struct kvm_vcpu *vcpu;
1773 int err = -EINVAL;
1774 int core;
1775 struct kvmppc_vcore *vcore;
1776
1777 core = id / threads_per_vcore();
1778 if (core >= KVM_MAX_VCORES)
1779 goto out;
1780
1781 err = -ENOMEM;
1782 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1783 if (!vcpu)
1784 goto out;
1785
1786 err = kvm_vcpu_init(vcpu, kvm, id);
1787 if (err)
1788 goto free_vcpu;
1789
1790 vcpu->arch.shared = &vcpu->arch.shregs;
1791 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1792 /*
1793 * The shared struct is never shared on HV,
1794 * so we can always use host endianness
1795 */
1796 #ifdef __BIG_ENDIAN__
1797 vcpu->arch.shared_big_endian = true;
1798 #else
1799 vcpu->arch.shared_big_endian = false;
1800 #endif
1801 #endif
1802 vcpu->arch.mmcr[0] = MMCR0_FC;
1803 vcpu->arch.ctrl = CTRL_RUNLATCH;
1804 /* default to host PVR, since we can't spoof it */
1805 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
1806 spin_lock_init(&vcpu->arch.vpa_update_lock);
1807 spin_lock_init(&vcpu->arch.tbacct_lock);
1808 vcpu->arch.busy_preempt = TB_NIL;
1809 vcpu->arch.intr_msr = MSR_SF | MSR_ME;
1810
1811 kvmppc_mmu_book3s_hv_init(vcpu);
1812
1813 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
1814
1815 init_waitqueue_head(&vcpu->arch.cpu_run);
1816
1817 mutex_lock(&kvm->lock);
1818 vcore = kvm->arch.vcores[core];
1819 if (!vcore) {
1820 vcore = kvmppc_vcore_create(kvm, core);
1821 kvm->arch.vcores[core] = vcore;
1822 kvm->arch.online_vcores++;
1823 }
1824 mutex_unlock(&kvm->lock);
1825
1826 if (!vcore)
1827 goto free_vcpu;
1828
1829 spin_lock(&vcore->lock);
1830 ++vcore->num_threads;
1831 spin_unlock(&vcore->lock);
1832 vcpu->arch.vcore = vcore;
1833 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
1834 vcpu->arch.thread_cpu = -1;
1835 vcpu->arch.prev_cpu = -1;
1836
1837 vcpu->arch.cpu_type = KVM_CPU_3S_64;
1838 kvmppc_sanity_check(vcpu);
1839
1840 debugfs_vcpu_init(vcpu, id);
1841
1842 return vcpu;
1843
1844 free_vcpu:
1845 kmem_cache_free(kvm_vcpu_cache, vcpu);
1846 out:
1847 return ERR_PTR(err);
1848 }
1849
1850 static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
1851 {
1852 if (vpa->pinned_addr)
1853 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
1854 vpa->dirty);
1855 }
1856
1857 static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
1858 {
1859 spin_lock(&vcpu->arch.vpa_update_lock);
1860 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
1861 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
1862 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
1863 spin_unlock(&vcpu->arch.vpa_update_lock);
1864 kvm_vcpu_uninit(vcpu);
1865 kmem_cache_free(kvm_vcpu_cache, vcpu);
1866 }
1867
1868 static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
1869 {
1870 /* Indicate we want to get back into the guest */
1871 return 1;
1872 }
1873
1874 static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
1875 {
1876 unsigned long dec_nsec, now;
1877
1878 now = get_tb();
1879 if (now > vcpu->arch.dec_expires) {
1880 /* decrementer has already gone negative */
1881 kvmppc_core_queue_dec(vcpu);
1882 kvmppc_core_prepare_to_enter(vcpu);
1883 return;
1884 }
1885 dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
1886 / tb_ticks_per_sec;
1887 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
1888 vcpu->arch.timer_running = 1;
1889 }
1890
1891 static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
1892 {
1893 vcpu->arch.ceded = 0;
1894 if (vcpu->arch.timer_running) {
1895 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1896 vcpu->arch.timer_running = 0;
1897 }
1898 }
1899
1900 extern void __kvmppc_vcore_entry(void);
1901
1902 static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
1903 struct kvm_vcpu *vcpu)
1904 {
1905 u64 now;
1906
1907 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
1908 return;
1909 spin_lock_irq(&vcpu->arch.tbacct_lock);
1910 now = mftb();
1911 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
1912 vcpu->arch.stolen_logged;
1913 vcpu->arch.busy_preempt = now;
1914 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
1915 spin_unlock_irq(&vcpu->arch.tbacct_lock);
1916 --vc->n_runnable;
1917 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
1918 }
1919
1920 static int kvmppc_grab_hwthread(int cpu)
1921 {
1922 struct paca_struct *tpaca;
1923 long timeout = 10000;
1924
1925 tpaca = &paca[cpu];
1926
1927 /* Ensure the thread won't go into the kernel if it wakes */
1928 tpaca->kvm_hstate.kvm_vcpu = NULL;
1929 tpaca->kvm_hstate.kvm_vcore = NULL;
1930 tpaca->kvm_hstate.napping = 0;
1931 smp_wmb();
1932 tpaca->kvm_hstate.hwthread_req = 1;
1933
1934 /*
1935 * If the thread is already executing in the kernel (e.g. handling
1936 * a stray interrupt), wait for it to get back to nap mode.
1937 * The smp_mb() is to ensure that our setting of hwthread_req
1938 * is visible before we look at hwthread_state, so if this
1939 * races with the code at system_reset_pSeries and the thread
1940 * misses our setting of hwthread_req, we are sure to see its
1941 * setting of hwthread_state, and vice versa.
1942 */
1943 smp_mb();
1944 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
1945 if (--timeout <= 0) {
1946 pr_err("KVM: couldn't grab cpu %d\n", cpu);
1947 return -EBUSY;
1948 }
1949 udelay(1);
1950 }
1951 return 0;
1952 }
1953
1954 static void kvmppc_release_hwthread(int cpu)
1955 {
1956 struct paca_struct *tpaca;
1957
1958 tpaca = &paca[cpu];
1959 tpaca->kvm_hstate.hwthread_req = 0;
1960 tpaca->kvm_hstate.kvm_vcpu = NULL;
1961 tpaca->kvm_hstate.kvm_vcore = NULL;
1962 tpaca->kvm_hstate.kvm_split_mode = NULL;
1963 }
1964
1965 static void do_nothing(void *x)
1966 {
1967 }
1968
1969 static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
1970 {
1971 int i;
1972
1973 cpu = cpu_first_thread_sibling(cpu);
1974 cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
1975 /*
1976 * Make sure setting of bit in need_tlb_flush precedes
1977 * testing of cpu_in_guest bits. The matching barrier on
1978 * the other side is the first smp_mb() in kvmppc_run_core().
1979 */
1980 smp_mb();
1981 for (i = 0; i < threads_per_core; ++i)
1982 if (cpumask_test_cpu(cpu + i, &kvm->arch.cpu_in_guest))
1983 smp_call_function_single(cpu + i, do_nothing, NULL, 1);
1984 }
1985
1986 static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
1987 {
1988 int cpu;
1989 struct paca_struct *tpaca;
1990 struct kvmppc_vcore *mvc = vc->master_vcore;
1991 struct kvm *kvm = vc->kvm;
1992
1993 cpu = vc->pcpu;
1994 if (vcpu) {
1995 if (vcpu->arch.timer_running) {
1996 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1997 vcpu->arch.timer_running = 0;
1998 }
1999 cpu += vcpu->arch.ptid;
2000 vcpu->cpu = mvc->pcpu;
2001 vcpu->arch.thread_cpu = cpu;
2002
2003 /*
2004 * With radix, the guest can do TLB invalidations itself,
2005 * and it could choose to use the local form (tlbiel) if
2006 * it is invalidating a translation that has only ever been
2007 * used on one vcpu. However, that doesn't mean it has
2008 * only ever been used on one physical cpu, since vcpus
2009 * can move around between pcpus. To cope with this, when
2010 * a vcpu moves from one pcpu to another, we need to tell
2011 * any vcpus running on the same core as this vcpu previously
2012 * ran to flush the TLB. The TLB is shared between threads,
2013 * so we use a single bit in .need_tlb_flush for all 4 threads.
2014 */
2015 if (kvm_is_radix(kvm) && vcpu->arch.prev_cpu != cpu) {
2016 if (vcpu->arch.prev_cpu >= 0 &&
2017 cpu_first_thread_sibling(vcpu->arch.prev_cpu) !=
2018 cpu_first_thread_sibling(cpu))
2019 radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu);
2020 vcpu->arch.prev_cpu = cpu;
2021 }
2022 cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
2023 }
2024 tpaca = &paca[cpu];
2025 tpaca->kvm_hstate.kvm_vcpu = vcpu;
2026 tpaca->kvm_hstate.ptid = cpu - mvc->pcpu;
2027 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
2028 smp_wmb();
2029 tpaca->kvm_hstate.kvm_vcore = mvc;
2030 if (cpu != smp_processor_id())
2031 kvmppc_ipi_thread(cpu);
2032 }
2033
2034 static void kvmppc_wait_for_nap(void)
2035 {
2036 int cpu = smp_processor_id();
2037 int i, loops;
2038 int n_threads = threads_per_vcore();
2039
2040 if (n_threads <= 1)
2041 return;
2042 for (loops = 0; loops < 1000000; ++loops) {
2043 /*
2044 * Check if all threads are finished.
2045 * We set the vcore pointer when starting a thread
2046 * and the thread clears it when finished, so we look
2047 * for any threads that still have a non-NULL vcore ptr.
2048 */
2049 for (i = 1; i < n_threads; ++i)
2050 if (paca[cpu + i].kvm_hstate.kvm_vcore)
2051 break;
2052 if (i == n_threads) {
2053 HMT_medium();
2054 return;
2055 }
2056 HMT_low();
2057 }
2058 HMT_medium();
2059 for (i = 1; i < n_threads; ++i)
2060 if (paca[cpu + i].kvm_hstate.kvm_vcore)
2061 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
2062 }
2063
2064 /*
2065 * Check that we are on thread 0 and that any other threads in
2066 * this core are off-line. Then grab the threads so they can't
2067 * enter the kernel.
2068 */
2069 static int on_primary_thread(void)
2070 {
2071 int cpu = smp_processor_id();
2072 int thr;
2073
2074 /* Are we on a primary subcore? */
2075 if (cpu_thread_in_subcore(cpu))
2076 return 0;
2077
2078 thr = 0;
2079 while (++thr < threads_per_subcore)
2080 if (cpu_online(cpu + thr))
2081 return 0;
2082
2083 /* Grab all hw threads so they can't go into the kernel */
2084 for (thr = 1; thr < threads_per_subcore; ++thr) {
2085 if (kvmppc_grab_hwthread(cpu + thr)) {
2086 /* Couldn't grab one; let the others go */
2087 do {
2088 kvmppc_release_hwthread(cpu + thr);
2089 } while (--thr > 0);
2090 return 0;
2091 }
2092 }
2093 return 1;
2094 }
2095
2096 /*
2097 * A list of virtual cores for each physical CPU.
2098 * These are vcores that could run but their runner VCPU tasks are
2099 * (or may be) preempted.
2100 */
2101 struct preempted_vcore_list {
2102 struct list_head list;
2103 spinlock_t lock;
2104 };
2105
2106 static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
2107
2108 static void init_vcore_lists(void)
2109 {
2110 int cpu;
2111
2112 for_each_possible_cpu(cpu) {
2113 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
2114 spin_lock_init(&lp->lock);
2115 INIT_LIST_HEAD(&lp->list);
2116 }
2117 }
2118
2119 static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
2120 {
2121 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2122
2123 vc->vcore_state = VCORE_PREEMPT;
2124 vc->pcpu = smp_processor_id();
2125 if (vc->num_threads < threads_per_vcore()) {
2126 spin_lock(&lp->lock);
2127 list_add_tail(&vc->preempt_list, &lp->list);
2128 spin_unlock(&lp->lock);
2129 }
2130
2131 /* Start accumulating stolen time */
2132 kvmppc_core_start_stolen(vc);
2133 }
2134
2135 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
2136 {
2137 struct preempted_vcore_list *lp;
2138
2139 kvmppc_core_end_stolen(vc);
2140 if (!list_empty(&vc->preempt_list)) {
2141 lp = &per_cpu(preempted_vcores, vc->pcpu);
2142 spin_lock(&lp->lock);
2143 list_del_init(&vc->preempt_list);
2144 spin_unlock(&lp->lock);
2145 }
2146 vc->vcore_state = VCORE_INACTIVE;
2147 }
2148
2149 /*
2150 * This stores information about the virtual cores currently
2151 * assigned to a physical core.
2152 */
2153 struct core_info {
2154 int n_subcores;
2155 int max_subcore_threads;
2156 int total_threads;
2157 int subcore_threads[MAX_SUBCORES];
2158 struct kvm *subcore_vm[MAX_SUBCORES];
2159 struct list_head vcs[MAX_SUBCORES];
2160 };
2161
2162 /*
2163 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
2164 * respectively in 2-way micro-threading (split-core) mode.
2165 */
2166 static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
2167
2168 static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
2169 {
2170 int sub;
2171
2172 memset(cip, 0, sizeof(*cip));
2173 cip->n_subcores = 1;
2174 cip->max_subcore_threads = vc->num_threads;
2175 cip->total_threads = vc->num_threads;
2176 cip->subcore_threads[0] = vc->num_threads;
2177 cip->subcore_vm[0] = vc->kvm;
2178 for (sub = 0; sub < MAX_SUBCORES; ++sub)
2179 INIT_LIST_HEAD(&cip->vcs[sub]);
2180 list_add_tail(&vc->preempt_list, &cip->vcs[0]);
2181 }
2182
2183 static bool subcore_config_ok(int n_subcores, int n_threads)
2184 {
2185 /* Can only dynamically split if unsplit to begin with */
2186 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
2187 return false;
2188 if (n_subcores > MAX_SUBCORES)
2189 return false;
2190 if (n_subcores > 1) {
2191 if (!(dynamic_mt_modes & 2))
2192 n_subcores = 4;
2193 if (n_subcores > 2 && !(dynamic_mt_modes & 4))
2194 return false;
2195 }
2196
2197 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
2198 }
2199
2200 static void init_master_vcore(struct kvmppc_vcore *vc)
2201 {
2202 vc->master_vcore = vc;
2203 vc->entry_exit_map = 0;
2204 vc->in_guest = 0;
2205 vc->napping_threads = 0;
2206 vc->conferring_threads = 0;
2207 }
2208
2209 static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
2210 {
2211 int n_threads = vc->num_threads;
2212 int sub;
2213
2214 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
2215 return false;
2216
2217 if (n_threads < cip->max_subcore_threads)
2218 n_threads = cip->max_subcore_threads;
2219 if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
2220 return false;
2221 cip->max_subcore_threads = n_threads;
2222
2223 sub = cip->n_subcores;
2224 ++cip->n_subcores;
2225 cip->total_threads += vc->num_threads;
2226 cip->subcore_threads[sub] = vc->num_threads;
2227 cip->subcore_vm[sub] = vc->kvm;
2228 init_master_vcore(vc);
2229 list_move_tail(&vc->preempt_list, &cip->vcs[sub]);
2230
2231 return true;
2232 }
2233
2234 /*
2235 * Work out whether it is possible to piggyback the execution of
2236 * vcore *pvc onto the execution of the other vcores described in *cip.
2237 */
2238 static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
2239 int target_threads)
2240 {
2241 if (cip->total_threads + pvc->num_threads > target_threads)
2242 return false;
2243
2244 return can_dynamic_split(pvc, cip);
2245 }
2246
2247 static void prepare_threads(struct kvmppc_vcore *vc)
2248 {
2249 int i;
2250 struct kvm_vcpu *vcpu;
2251
2252 for_each_runnable_thread(i, vcpu, vc) {
2253 if (signal_pending(vcpu->arch.run_task))
2254 vcpu->arch.ret = -EINTR;
2255 else if (vcpu->arch.vpa.update_pending ||
2256 vcpu->arch.slb_shadow.update_pending ||
2257 vcpu->arch.dtl.update_pending)
2258 vcpu->arch.ret = RESUME_GUEST;
2259 else
2260 continue;
2261 kvmppc_remove_runnable(vc, vcpu);
2262 wake_up(&vcpu->arch.cpu_run);
2263 }
2264 }
2265
2266 static void collect_piggybacks(struct core_info *cip, int target_threads)
2267 {
2268 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2269 struct kvmppc_vcore *pvc, *vcnext;
2270
2271 spin_lock(&lp->lock);
2272 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
2273 if (!spin_trylock(&pvc->lock))
2274 continue;
2275 prepare_threads(pvc);
2276 if (!pvc->n_runnable) {
2277 list_del_init(&pvc->preempt_list);
2278 if (pvc->runner == NULL) {
2279 pvc->vcore_state = VCORE_INACTIVE;
2280 kvmppc_core_end_stolen(pvc);
2281 }
2282 spin_unlock(&pvc->lock);
2283 continue;
2284 }
2285 if (!can_piggyback(pvc, cip, target_threads)) {
2286 spin_unlock(&pvc->lock);
2287 continue;
2288 }
2289 kvmppc_core_end_stolen(pvc);
2290 pvc->vcore_state = VCORE_PIGGYBACK;
2291 if (cip->total_threads >= target_threads)
2292 break;
2293 }
2294 spin_unlock(&lp->lock);
2295 }
2296
2297 static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
2298 {
2299 int still_running = 0, i;
2300 u64 now;
2301 long ret;
2302 struct kvm_vcpu *vcpu;
2303
2304 spin_lock(&vc->lock);
2305 now = get_tb();
2306 for_each_runnable_thread(i, vcpu, vc) {
2307 /* cancel pending dec exception if dec is positive */
2308 if (now < vcpu->arch.dec_expires &&
2309 kvmppc_core_pending_dec(vcpu))
2310 kvmppc_core_dequeue_dec(vcpu);
2311
2312 trace_kvm_guest_exit(vcpu);
2313
2314 ret = RESUME_GUEST;
2315 if (vcpu->arch.trap)
2316 ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
2317 vcpu->arch.run_task);
2318
2319 vcpu->arch.ret = ret;
2320 vcpu->arch.trap = 0;
2321
2322 if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
2323 if (vcpu->arch.pending_exceptions)
2324 kvmppc_core_prepare_to_enter(vcpu);
2325 if (vcpu->arch.ceded)
2326 kvmppc_set_timer(vcpu);
2327 else
2328 ++still_running;
2329 } else {
2330 kvmppc_remove_runnable(vc, vcpu);
2331 wake_up(&vcpu->arch.cpu_run);
2332 }
2333 }
2334 list_del_init(&vc->preempt_list);
2335 if (!is_master) {
2336 if (still_running > 0) {
2337 kvmppc_vcore_preempt(vc);
2338 } else if (vc->runner) {
2339 vc->vcore_state = VCORE_PREEMPT;
2340 kvmppc_core_start_stolen(vc);
2341 } else {
2342 vc->vcore_state = VCORE_INACTIVE;
2343 }
2344 if (vc->n_runnable > 0 && vc->runner == NULL) {
2345 /* make sure there's a candidate runner awake */
2346 i = -1;
2347 vcpu = next_runnable_thread(vc, &i);
2348 wake_up(&vcpu->arch.cpu_run);
2349 }
2350 }
2351 spin_unlock(&vc->lock);
2352 }
2353
2354 /*
2355 * Clear core from the list of active host cores as we are about to
2356 * enter the guest. Only do this if it is the primary thread of the
2357 * core (not if a subcore) that is entering the guest.
2358 */
2359 static inline int kvmppc_clear_host_core(unsigned int cpu)
2360 {
2361 int core;
2362
2363 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
2364 return 0;
2365 /*
2366 * Memory barrier can be omitted here as we will do a smp_wmb()
2367 * later in kvmppc_start_thread and we need ensure that state is
2368 * visible to other CPUs only after we enter guest.
2369 */
2370 core = cpu >> threads_shift;
2371 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
2372 return 0;
2373 }
2374
2375 /*
2376 * Advertise this core as an active host core since we exited the guest
2377 * Only need to do this if it is the primary thread of the core that is
2378 * exiting.
2379 */
2380 static inline int kvmppc_set_host_core(unsigned int cpu)
2381 {
2382 int core;
2383
2384 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
2385 return 0;
2386
2387 /*
2388 * Memory barrier can be omitted here because we do a spin_unlock
2389 * immediately after this which provides the memory barrier.
2390 */
2391 core = cpu >> threads_shift;
2392 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
2393 return 0;
2394 }
2395
2396 /*
2397 * Run a set of guest threads on a physical core.
2398 * Called with vc->lock held.
2399 */
2400 static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
2401 {
2402 struct kvm_vcpu *vcpu;
2403 int i;
2404 int srcu_idx;
2405 struct core_info core_info;
2406 struct kvmppc_vcore *pvc, *vcnext;
2407 struct kvm_split_mode split_info, *sip;
2408 int split, subcore_size, active;
2409 int sub;
2410 bool thr0_done;
2411 unsigned long cmd_bit, stat_bit;
2412 int pcpu, thr;
2413 int target_threads;
2414 int controlled_threads;
2415
2416 /*
2417 * Remove from the list any threads that have a signal pending
2418 * or need a VPA update done
2419 */
2420 prepare_threads(vc);
2421
2422 /* if the runner is no longer runnable, let the caller pick a new one */
2423 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
2424 return;
2425
2426 /*
2427 * Initialize *vc.
2428 */
2429 init_master_vcore(vc);
2430 vc->preempt_tb = TB_NIL;
2431
2432 /*
2433 * Number of threads that we will be controlling: the same as
2434 * the number of threads per subcore, except on POWER9,
2435 * where it's 1 because the threads are (mostly) independent.
2436 */
2437 controlled_threads = threads_per_vcore();
2438
2439 /*
2440 * Make sure we are running on primary threads, and that secondary
2441 * threads are offline. Also check if the number of threads in this
2442 * guest are greater than the current system threads per guest.
2443 */
2444 if ((controlled_threads > 1) &&
2445 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
2446 for_each_runnable_thread(i, vcpu, vc) {
2447 vcpu->arch.ret = -EBUSY;
2448 kvmppc_remove_runnable(vc, vcpu);
2449 wake_up(&vcpu->arch.cpu_run);
2450 }
2451 goto out;
2452 }
2453
2454 /*
2455 * See if we could run any other vcores on the physical core
2456 * along with this one.
2457 */
2458 init_core_info(&core_info, vc);
2459 pcpu = smp_processor_id();
2460 target_threads = controlled_threads;
2461 if (target_smt_mode && target_smt_mode < target_threads)
2462 target_threads = target_smt_mode;
2463 if (vc->num_threads < target_threads)
2464 collect_piggybacks(&core_info, target_threads);
2465
2466 /* Decide on micro-threading (split-core) mode */
2467 subcore_size = threads_per_subcore;
2468 cmd_bit = stat_bit = 0;
2469 split = core_info.n_subcores;
2470 sip = NULL;
2471 if (split > 1) {
2472 /* threads_per_subcore must be MAX_SMT_THREADS (8) here */
2473 if (split == 2 && (dynamic_mt_modes & 2)) {
2474 cmd_bit = HID0_POWER8_1TO2LPAR;
2475 stat_bit = HID0_POWER8_2LPARMODE;
2476 } else {
2477 split = 4;
2478 cmd_bit = HID0_POWER8_1TO4LPAR;
2479 stat_bit = HID0_POWER8_4LPARMODE;
2480 }
2481 subcore_size = MAX_SMT_THREADS / split;
2482 sip = &split_info;
2483 memset(&split_info, 0, sizeof(split_info));
2484 split_info.rpr = mfspr(SPRN_RPR);
2485 split_info.pmmar = mfspr(SPRN_PMMAR);
2486 split_info.ldbar = mfspr(SPRN_LDBAR);
2487 split_info.subcore_size = subcore_size;
2488 for (sub = 0; sub < core_info.n_subcores; ++sub)
2489 split_info.master_vcs[sub] =
2490 list_first_entry(&core_info.vcs[sub],
2491 struct kvmppc_vcore, preempt_list);
2492 /* order writes to split_info before kvm_split_mode pointer */
2493 smp_wmb();
2494 }
2495 pcpu = smp_processor_id();
2496 for (thr = 0; thr < controlled_threads; ++thr)
2497 paca[pcpu + thr].kvm_hstate.kvm_split_mode = sip;
2498
2499 /* Initiate micro-threading (split-core) if required */
2500 if (cmd_bit) {
2501 unsigned long hid0 = mfspr(SPRN_HID0);
2502
2503 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
2504 mb();
2505 mtspr(SPRN_HID0, hid0);
2506 isync();
2507 for (;;) {
2508 hid0 = mfspr(SPRN_HID0);
2509 if (hid0 & stat_bit)
2510 break;
2511 cpu_relax();
2512 }
2513 }
2514
2515 kvmppc_clear_host_core(pcpu);
2516
2517 /* Start all the threads */
2518 active = 0;
2519 for (sub = 0; sub < core_info.n_subcores; ++sub) {
2520 thr = subcore_thread_map[sub];
2521 thr0_done = false;
2522 active |= 1 << thr;
2523 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list) {
2524 pvc->pcpu = pcpu + thr;
2525 for_each_runnable_thread(i, vcpu, pvc) {
2526 kvmppc_start_thread(vcpu, pvc);
2527 kvmppc_create_dtl_entry(vcpu, pvc);
2528 trace_kvm_guest_enter(vcpu);
2529 if (!vcpu->arch.ptid)
2530 thr0_done = true;
2531 active |= 1 << (thr + vcpu->arch.ptid);
2532 }
2533 /*
2534 * We need to start the first thread of each subcore
2535 * even if it doesn't have a vcpu.
2536 */
2537 if (pvc->master_vcore == pvc && !thr0_done)
2538 kvmppc_start_thread(NULL, pvc);
2539 thr += pvc->num_threads;
2540 }
2541 }
2542
2543 /*
2544 * Ensure that split_info.do_nap is set after setting
2545 * the vcore pointer in the PACA of the secondaries.
2546 */
2547 smp_mb();
2548 if (cmd_bit)
2549 split_info.do_nap = 1; /* ask secondaries to nap when done */
2550
2551 /*
2552 * When doing micro-threading, poke the inactive threads as well.
2553 * This gets them to the nap instruction after kvm_do_nap,
2554 * which reduces the time taken to unsplit later.
2555 */
2556 if (split > 1)
2557 for (thr = 1; thr < threads_per_subcore; ++thr)
2558 if (!(active & (1 << thr)))
2559 kvmppc_ipi_thread(pcpu + thr);
2560
2561 vc->vcore_state = VCORE_RUNNING;
2562 preempt_disable();
2563
2564 trace_kvmppc_run_core(vc, 0);
2565
2566 for (sub = 0; sub < core_info.n_subcores; ++sub)
2567 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list)
2568 spin_unlock(&pvc->lock);
2569
2570 guest_enter();
2571
2572 srcu_idx = srcu_read_lock(&vc->kvm->srcu);
2573
2574 __kvmppc_vcore_entry();
2575
2576 srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
2577
2578 spin_lock(&vc->lock);
2579 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
2580 vc->vcore_state = VCORE_EXITING;
2581
2582 /* wait for secondary threads to finish writing their state to memory */
2583 kvmppc_wait_for_nap();
2584
2585 /* Return to whole-core mode if we split the core earlier */
2586 if (split > 1) {
2587 unsigned long hid0 = mfspr(SPRN_HID0);
2588 unsigned long loops = 0;
2589
2590 hid0 &= ~HID0_POWER8_DYNLPARDIS;
2591 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
2592 mb();
2593 mtspr(SPRN_HID0, hid0);
2594 isync();
2595 for (;;) {
2596 hid0 = mfspr(SPRN_HID0);
2597 if (!(hid0 & stat_bit))
2598 break;
2599 cpu_relax();
2600 ++loops;
2601 }
2602 split_info.do_nap = 0;
2603 }
2604
2605 /* Let secondaries go back to the offline loop */
2606 for (i = 0; i < controlled_threads; ++i) {
2607 kvmppc_release_hwthread(pcpu + i);
2608 if (sip && sip->napped[i])
2609 kvmppc_ipi_thread(pcpu + i);
2610 cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
2611 }
2612
2613 kvmppc_set_host_core(pcpu);
2614
2615 spin_unlock(&vc->lock);
2616
2617 /* make sure updates to secondary vcpu structs are visible now */
2618 smp_mb();
2619 guest_exit();
2620
2621 for (sub = 0; sub < core_info.n_subcores; ++sub)
2622 list_for_each_entry_safe(pvc, vcnext, &core_info.vcs[sub],
2623 preempt_list)
2624 post_guest_process(pvc, pvc == vc);
2625
2626 spin_lock(&vc->lock);
2627 preempt_enable();
2628
2629 out:
2630 vc->vcore_state = VCORE_INACTIVE;
2631 trace_kvmppc_run_core(vc, 1);
2632 }
2633
2634 /*
2635 * Wait for some other vcpu thread to execute us, and
2636 * wake us up when we need to handle something in the host.
2637 */
2638 static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
2639 struct kvm_vcpu *vcpu, int wait_state)
2640 {
2641 DEFINE_WAIT(wait);
2642
2643 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
2644 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
2645 spin_unlock(&vc->lock);
2646 schedule();
2647 spin_lock(&vc->lock);
2648 }
2649 finish_wait(&vcpu->arch.cpu_run, &wait);
2650 }
2651
2652 static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
2653 {
2654 /* 10us base */
2655 if (vc->halt_poll_ns == 0 && halt_poll_ns_grow)
2656 vc->halt_poll_ns = 10000;
2657 else
2658 vc->halt_poll_ns *= halt_poll_ns_grow;
2659 }
2660
2661 static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
2662 {
2663 if (halt_poll_ns_shrink == 0)
2664 vc->halt_poll_ns = 0;
2665 else
2666 vc->halt_poll_ns /= halt_poll_ns_shrink;
2667 }
2668
2669 /*
2670 * Check to see if any of the runnable vcpus on the vcore have pending
2671 * exceptions or are no longer ceded
2672 */
2673 static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
2674 {
2675 struct kvm_vcpu *vcpu;
2676 int i;
2677
2678 for_each_runnable_thread(i, vcpu, vc) {
2679 if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded ||
2680 vcpu->arch.prodded)
2681 return 1;
2682 }
2683
2684 return 0;
2685 }
2686
2687 /*
2688 * All the vcpus in this vcore are idle, so wait for a decrementer
2689 * or external interrupt to one of the vcpus. vc->lock is held.
2690 */
2691 static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
2692 {
2693 ktime_t cur, start_poll, start_wait;
2694 int do_sleep = 1;
2695 u64 block_ns;
2696 DECLARE_SWAITQUEUE(wait);
2697
2698 /* Poll for pending exceptions and ceded state */
2699 cur = start_poll = ktime_get();
2700 if (vc->halt_poll_ns) {
2701 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
2702 ++vc->runner->stat.halt_attempted_poll;
2703
2704 vc->vcore_state = VCORE_POLLING;
2705 spin_unlock(&vc->lock);
2706
2707 do {
2708 if (kvmppc_vcore_check_block(vc)) {
2709 do_sleep = 0;
2710 break;
2711 }
2712 cur = ktime_get();
2713 } while (single_task_running() && ktime_before(cur, stop));
2714
2715 spin_lock(&vc->lock);
2716 vc->vcore_state = VCORE_INACTIVE;
2717
2718 if (!do_sleep) {
2719 ++vc->runner->stat.halt_successful_poll;
2720 goto out;
2721 }
2722 }
2723
2724 prepare_to_swait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
2725
2726 if (kvmppc_vcore_check_block(vc)) {
2727 finish_swait(&vc->wq, &wait);
2728 do_sleep = 0;
2729 /* If we polled, count this as a successful poll */
2730 if (vc->halt_poll_ns)
2731 ++vc->runner->stat.halt_successful_poll;
2732 goto out;
2733 }
2734
2735 start_wait = ktime_get();
2736
2737 vc->vcore_state = VCORE_SLEEPING;
2738 trace_kvmppc_vcore_blocked(vc, 0);
2739 spin_unlock(&vc->lock);
2740 schedule();
2741 finish_swait(&vc->wq, &wait);
2742 spin_lock(&vc->lock);
2743 vc->vcore_state = VCORE_INACTIVE;
2744 trace_kvmppc_vcore_blocked(vc, 1);
2745 ++vc->runner->stat.halt_successful_wait;
2746
2747 cur = ktime_get();
2748
2749 out:
2750 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
2751
2752 /* Attribute wait time */
2753 if (do_sleep) {
2754 vc->runner->stat.halt_wait_ns +=
2755 ktime_to_ns(cur) - ktime_to_ns(start_wait);
2756 /* Attribute failed poll time */
2757 if (vc->halt_poll_ns)
2758 vc->runner->stat.halt_poll_fail_ns +=
2759 ktime_to_ns(start_wait) -
2760 ktime_to_ns(start_poll);
2761 } else {
2762 /* Attribute successful poll time */
2763 if (vc->halt_poll_ns)
2764 vc->runner->stat.halt_poll_success_ns +=
2765 ktime_to_ns(cur) -
2766 ktime_to_ns(start_poll);
2767 }
2768
2769 /* Adjust poll time */
2770 if (halt_poll_ns) {
2771 if (block_ns <= vc->halt_poll_ns)
2772 ;
2773 /* We slept and blocked for longer than the max halt time */
2774 else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
2775 shrink_halt_poll_ns(vc);
2776 /* We slept and our poll time is too small */
2777 else if (vc->halt_poll_ns < halt_poll_ns &&
2778 block_ns < halt_poll_ns)
2779 grow_halt_poll_ns(vc);
2780 if (vc->halt_poll_ns > halt_poll_ns)
2781 vc->halt_poll_ns = halt_poll_ns;
2782 } else
2783 vc->halt_poll_ns = 0;
2784
2785 trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
2786 }
2787
2788 static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
2789 {
2790 int n_ceded, i;
2791 struct kvmppc_vcore *vc;
2792 struct kvm_vcpu *v;
2793
2794 trace_kvmppc_run_vcpu_enter(vcpu);
2795
2796 kvm_run->exit_reason = 0;
2797 vcpu->arch.ret = RESUME_GUEST;
2798 vcpu->arch.trap = 0;
2799 kvmppc_update_vpas(vcpu);
2800
2801 /*
2802 * Synchronize with other threads in this virtual core
2803 */
2804 vc = vcpu->arch.vcore;
2805 spin_lock(&vc->lock);
2806 vcpu->arch.ceded = 0;
2807 vcpu->arch.run_task = current;
2808 vcpu->arch.kvm_run = kvm_run;
2809 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
2810 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
2811 vcpu->arch.busy_preempt = TB_NIL;
2812 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
2813 ++vc->n_runnable;
2814
2815 /*
2816 * This happens the first time this is called for a vcpu.
2817 * If the vcore is already running, we may be able to start
2818 * this thread straight away and have it join in.
2819 */
2820 if (!signal_pending(current)) {
2821 if (vc->vcore_state == VCORE_PIGGYBACK) {
2822 struct kvmppc_vcore *mvc = vc->master_vcore;
2823 if (spin_trylock(&mvc->lock)) {
2824 if (mvc->vcore_state == VCORE_RUNNING &&
2825 !VCORE_IS_EXITING(mvc)) {
2826 kvmppc_create_dtl_entry(vcpu, vc);
2827 kvmppc_start_thread(vcpu, vc);
2828 trace_kvm_guest_enter(vcpu);
2829 }
2830 spin_unlock(&mvc->lock);
2831 }
2832 } else if (vc->vcore_state == VCORE_RUNNING &&
2833 !VCORE_IS_EXITING(vc)) {
2834 kvmppc_create_dtl_entry(vcpu, vc);
2835 kvmppc_start_thread(vcpu, vc);
2836 trace_kvm_guest_enter(vcpu);
2837 } else if (vc->vcore_state == VCORE_SLEEPING) {
2838 swake_up(&vc->wq);
2839 }
2840
2841 }
2842
2843 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
2844 !signal_pending(current)) {
2845 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
2846 kvmppc_vcore_end_preempt(vc);
2847
2848 if (vc->vcore_state != VCORE_INACTIVE) {
2849 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
2850 continue;
2851 }
2852 for_each_runnable_thread(i, v, vc) {
2853 kvmppc_core_prepare_to_enter(v);
2854 if (signal_pending(v->arch.run_task)) {
2855 kvmppc_remove_runnable(vc, v);
2856 v->stat.signal_exits++;
2857 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
2858 v->arch.ret = -EINTR;
2859 wake_up(&v->arch.cpu_run);
2860 }
2861 }
2862 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
2863 break;
2864 n_ceded = 0;
2865 for_each_runnable_thread(i, v, vc) {
2866 if (!v->arch.pending_exceptions && !v->arch.prodded)
2867 n_ceded += v->arch.ceded;
2868 else
2869 v->arch.ceded = 0;
2870 }
2871 vc->runner = vcpu;
2872 if (n_ceded == vc->n_runnable) {
2873 kvmppc_vcore_blocked(vc);
2874 } else if (need_resched()) {
2875 kvmppc_vcore_preempt(vc);
2876 /* Let something else run */
2877 cond_resched_lock(&vc->lock);
2878 if (vc->vcore_state == VCORE_PREEMPT)
2879 kvmppc_vcore_end_preempt(vc);
2880 } else {
2881 kvmppc_run_core(vc);
2882 }
2883 vc->runner = NULL;
2884 }
2885
2886 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
2887 (vc->vcore_state == VCORE_RUNNING ||
2888 vc->vcore_state == VCORE_EXITING ||
2889 vc->vcore_state == VCORE_PIGGYBACK))
2890 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
2891
2892 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
2893 kvmppc_vcore_end_preempt(vc);
2894
2895 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
2896 kvmppc_remove_runnable(vc, vcpu);
2897 vcpu->stat.signal_exits++;
2898 kvm_run->exit_reason = KVM_EXIT_INTR;
2899 vcpu->arch.ret = -EINTR;
2900 }
2901
2902 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
2903 /* Wake up some vcpu to run the core */
2904 i = -1;
2905 v = next_runnable_thread(vc, &i);
2906 wake_up(&v->arch.cpu_run);
2907 }
2908
2909 trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
2910 spin_unlock(&vc->lock);
2911 return vcpu->arch.ret;
2912 }
2913
2914 static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
2915 {
2916 int r;
2917 int srcu_idx;
2918 unsigned long ebb_regs[3] = {}; /* shut up GCC */
2919 unsigned long user_tar = 0;
2920 unsigned int user_vrsave;
2921
2922 if (!vcpu->arch.sane) {
2923 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2924 return -EINVAL;
2925 }
2926
2927 /*
2928 * Don't allow entry with a suspended transaction, because
2929 * the guest entry/exit code will lose it.
2930 * If the guest has TM enabled, save away their TM-related SPRs
2931 * (they will get restored by the TM unavailable interrupt).
2932 */
2933 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2934 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
2935 (current->thread.regs->msr & MSR_TM)) {
2936 if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
2937 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
2938 run->fail_entry.hardware_entry_failure_reason = 0;
2939 return -EINVAL;
2940 }
2941 current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
2942 current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
2943 current->thread.tm_texasr = mfspr(SPRN_TEXASR);
2944 current->thread.regs->msr &= ~MSR_TM;
2945 }
2946 #endif
2947
2948 kvmppc_core_prepare_to_enter(vcpu);
2949
2950 /* No need to go into the guest when all we'll do is come back out */
2951 if (signal_pending(current)) {
2952 run->exit_reason = KVM_EXIT_INTR;
2953 return -EINTR;
2954 }
2955
2956 atomic_inc(&vcpu->kvm->arch.vcpus_running);
2957 /* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */
2958 smp_mb();
2959
2960 /* On the first time here, set up HTAB and VRMA */
2961 if (!kvm_is_radix(vcpu->kvm) && !vcpu->kvm->arch.hpte_setup_done) {
2962 r = kvmppc_hv_setup_htab_rma(vcpu);
2963 if (r)
2964 goto out;
2965 }
2966
2967 flush_all_to_thread(current);
2968
2969 /* Save userspace EBB and other register values */
2970 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
2971 ebb_regs[0] = mfspr(SPRN_EBBHR);
2972 ebb_regs[1] = mfspr(SPRN_EBBRR);
2973 ebb_regs[2] = mfspr(SPRN_BESCR);
2974 user_tar = mfspr(SPRN_TAR);
2975 }
2976 user_vrsave = mfspr(SPRN_VRSAVE);
2977
2978 vcpu->arch.wqp = &vcpu->arch.vcore->wq;
2979 vcpu->arch.pgdir = current->mm->pgd;
2980 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
2981
2982 do {
2983 r = kvmppc_run_vcpu(run, vcpu);
2984
2985 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
2986 !(vcpu->arch.shregs.msr & MSR_PR)) {
2987 trace_kvm_hcall_enter(vcpu);
2988 r = kvmppc_pseries_do_hcall(vcpu);
2989 trace_kvm_hcall_exit(vcpu, r);
2990 kvmppc_core_prepare_to_enter(vcpu);
2991 } else if (r == RESUME_PAGE_FAULT) {
2992 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2993 r = kvmppc_book3s_hv_page_fault(run, vcpu,
2994 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
2995 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
2996 } else if (r == RESUME_PASSTHROUGH) {
2997 if (WARN_ON(xive_enabled()))
2998 r = H_SUCCESS;
2999 else
3000 r = kvmppc_xics_rm_complete(vcpu, 0);
3001 }
3002 } while (is_kvmppc_resume_guest(r));
3003
3004 /* Restore userspace EBB and other register values */
3005 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
3006 mtspr(SPRN_EBBHR, ebb_regs[0]);
3007 mtspr(SPRN_EBBRR, ebb_regs[1]);
3008 mtspr(SPRN_BESCR, ebb_regs[2]);
3009 mtspr(SPRN_TAR, user_tar);
3010 mtspr(SPRN_FSCR, current->thread.fscr);
3011 }
3012 mtspr(SPRN_VRSAVE, user_vrsave);
3013
3014 out:
3015 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
3016 atomic_dec(&vcpu->kvm->arch.vcpus_running);
3017 return r;
3018 }
3019
3020 static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
3021 int linux_psize)
3022 {
3023 struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
3024
3025 if (!def->shift)
3026 return;
3027 (*sps)->page_shift = def->shift;
3028 (*sps)->slb_enc = def->sllp;
3029 (*sps)->enc[0].page_shift = def->shift;
3030 (*sps)->enc[0].pte_enc = def->penc[linux_psize];
3031 /*
3032 * Add 16MB MPSS support if host supports it
3033 */
3034 if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) {
3035 (*sps)->enc[1].page_shift = 24;
3036 (*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M];
3037 }
3038 (*sps)++;
3039 }
3040
3041 static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
3042 struct kvm_ppc_smmu_info *info)
3043 {
3044 struct kvm_ppc_one_seg_page_size *sps;
3045
3046 /*
3047 * Since we don't yet support HPT guests on a radix host,
3048 * return an error if the host uses radix.
3049 */
3050 if (radix_enabled())
3051 return -EINVAL;
3052
3053 info->flags = KVM_PPC_PAGE_SIZES_REAL;
3054 if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
3055 info->flags |= KVM_PPC_1T_SEGMENTS;
3056 info->slb_size = mmu_slb_size;
3057
3058 /* We only support these sizes for now, and no muti-size segments */
3059 sps = &info->sps[0];
3060 kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
3061 kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
3062 kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
3063
3064 return 0;
3065 }
3066
3067 /*
3068 * Get (and clear) the dirty memory log for a memory slot.
3069 */
3070 static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
3071 struct kvm_dirty_log *log)
3072 {
3073 struct kvm_memslots *slots;
3074 struct kvm_memory_slot *memslot;
3075 int i, r;
3076 unsigned long n;
3077 unsigned long *buf;
3078 struct kvm_vcpu *vcpu;
3079
3080 mutex_lock(&kvm->slots_lock);
3081
3082 r = -EINVAL;
3083 if (log->slot >= KVM_USER_MEM_SLOTS)
3084 goto out;
3085
3086 slots = kvm_memslots(kvm);
3087 memslot = id_to_memslot(slots, log->slot);
3088 r = -ENOENT;
3089 if (!memslot->dirty_bitmap)
3090 goto out;
3091
3092 /*
3093 * Use second half of bitmap area because radix accumulates
3094 * bits in the first half.
3095 */
3096 n = kvm_dirty_bitmap_bytes(memslot);
3097 buf = memslot->dirty_bitmap + n / sizeof(long);
3098 memset(buf, 0, n);
3099
3100 if (kvm_is_radix(kvm))
3101 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
3102 else
3103 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
3104 if (r)
3105 goto out;
3106
3107 /* Harvest dirty bits from VPA and DTL updates */
3108 /* Note: we never modify the SLB shadow buffer areas */
3109 kvm_for_each_vcpu(i, vcpu, kvm) {
3110 spin_lock(&vcpu->arch.vpa_update_lock);
3111 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
3112 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
3113 spin_unlock(&vcpu->arch.vpa_update_lock);
3114 }
3115
3116 r = -EFAULT;
3117 if (copy_to_user(log->dirty_bitmap, buf, n))
3118 goto out;
3119
3120 r = 0;
3121 out:
3122 mutex_unlock(&kvm->slots_lock);
3123 return r;
3124 }
3125
3126 static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
3127 struct kvm_memory_slot *dont)
3128 {
3129 if (!dont || free->arch.rmap != dont->arch.rmap) {
3130 vfree(free->arch.rmap);
3131 free->arch.rmap = NULL;
3132 }
3133 }
3134
3135 static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
3136 unsigned long npages)
3137 {
3138 /*
3139 * For now, if radix_enabled() then we only support radix guests,
3140 * and in that case we don't need the rmap array.
3141 */
3142 if (radix_enabled()) {
3143 slot->arch.rmap = NULL;
3144 return 0;
3145 }
3146
3147 slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
3148 if (!slot->arch.rmap)
3149 return -ENOMEM;
3150
3151 return 0;
3152 }
3153
3154 static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
3155 struct kvm_memory_slot *memslot,
3156 const struct kvm_userspace_memory_region *mem)
3157 {
3158 return 0;
3159 }
3160
3161 static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
3162 const struct kvm_userspace_memory_region *mem,
3163 const struct kvm_memory_slot *old,
3164 const struct kvm_memory_slot *new)
3165 {
3166 unsigned long npages = mem->memory_size >> PAGE_SHIFT;
3167 struct kvm_memslots *slots;
3168 struct kvm_memory_slot *memslot;
3169
3170 /*
3171 * If we are making a new memslot, it might make
3172 * some address that was previously cached as emulated
3173 * MMIO be no longer emulated MMIO, so invalidate
3174 * all the caches of emulated MMIO translations.
3175 */
3176 if (npages)
3177 atomic64_inc(&kvm->arch.mmio_update);
3178
3179 if (npages && old->npages && !kvm_is_radix(kvm)) {
3180 /*
3181 * If modifying a memslot, reset all the rmap dirty bits.
3182 * If this is a new memslot, we don't need to do anything
3183 * since the rmap array starts out as all zeroes,
3184 * i.e. no pages are dirty.
3185 */
3186 slots = kvm_memslots(kvm);
3187 memslot = id_to_memslot(slots, mem->slot);
3188 kvmppc_hv_get_dirty_log_hpt(kvm, memslot, NULL);
3189 }
3190 }
3191
3192 /*
3193 * Update LPCR values in kvm->arch and in vcores.
3194 * Caller must hold kvm->lock.
3195 */
3196 void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
3197 {
3198 long int i;
3199 u32 cores_done = 0;
3200
3201 if ((kvm->arch.lpcr & mask) == lpcr)
3202 return;
3203
3204 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
3205
3206 for (i = 0; i < KVM_MAX_VCORES; ++i) {
3207 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
3208 if (!vc)
3209 continue;
3210 spin_lock(&vc->lock);
3211 vc->lpcr = (vc->lpcr & ~mask) | lpcr;
3212 spin_unlock(&vc->lock);
3213 if (++cores_done >= kvm->arch.online_vcores)
3214 break;
3215 }
3216 }
3217
3218 static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
3219 {
3220 return;
3221 }
3222
3223 static void kvmppc_setup_partition_table(struct kvm *kvm)
3224 {
3225 unsigned long dw0, dw1;
3226
3227 if (!kvm_is_radix(kvm)) {
3228 /* PS field - page size for VRMA */
3229 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
3230 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
3231 /* HTABSIZE and HTABORG fields */
3232 dw0 |= kvm->arch.sdr1;
3233
3234 /* Second dword as set by userspace */
3235 dw1 = kvm->arch.process_table;
3236 } else {
3237 dw0 = PATB_HR | radix__get_tree_size() |
3238 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
3239 dw1 = PATB_GR | kvm->arch.process_table;
3240 }
3241
3242 mmu_partition_table_set_entry(kvm->arch.lpid, dw0, dw1);
3243 }
3244
3245 static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
3246 {
3247 int err = 0;
3248 struct kvm *kvm = vcpu->kvm;
3249 unsigned long hva;
3250 struct kvm_memory_slot *memslot;
3251 struct vm_area_struct *vma;
3252 unsigned long lpcr = 0, senc;
3253 unsigned long psize, porder;
3254 int srcu_idx;
3255
3256 mutex_lock(&kvm->lock);
3257 if (kvm->arch.hpte_setup_done)
3258 goto out; /* another vcpu beat us to it */
3259
3260 /* Allocate hashed page table (if not done already) and reset it */
3261 if (!kvm->arch.hpt.virt) {
3262 int order = KVM_DEFAULT_HPT_ORDER;
3263 struct kvm_hpt_info info;
3264
3265 err = kvmppc_allocate_hpt(&info, order);
3266 /* If we get here, it means userspace didn't specify a
3267 * size explicitly. So, try successively smaller
3268 * sizes if the default failed. */
3269 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
3270 err = kvmppc_allocate_hpt(&info, order);
3271
3272 if (err < 0) {
3273 pr_err("KVM: Couldn't alloc HPT\n");
3274 goto out;
3275 }
3276
3277 kvmppc_set_hpt(kvm, &info);
3278 }
3279
3280 /* Look up the memslot for guest physical address 0 */
3281 srcu_idx = srcu_read_lock(&kvm->srcu);
3282 memslot = gfn_to_memslot(kvm, 0);
3283
3284 /* We must have some memory at 0 by now */
3285 err = -EINVAL;
3286 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
3287 goto out_srcu;
3288
3289 /* Look up the VMA for the start of this memory slot */
3290 hva = memslot->userspace_addr;
3291 down_read(&current->mm->mmap_sem);
3292 vma = find_vma(current->mm, hva);
3293 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
3294 goto up_out;
3295
3296 psize = vma_kernel_pagesize(vma);
3297 porder = __ilog2(psize);
3298
3299 up_read(&current->mm->mmap_sem);
3300
3301 /* We can handle 4k, 64k or 16M pages in the VRMA */
3302 err = -EINVAL;
3303 if (!(psize == 0x1000 || psize == 0x10000 ||
3304 psize == 0x1000000))
3305 goto out_srcu;
3306
3307 senc = slb_pgsize_encoding(psize);
3308 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
3309 (VRMA_VSID << SLB_VSID_SHIFT_1T);
3310 /* Create HPTEs in the hash page table for the VRMA */
3311 kvmppc_map_vrma(vcpu, memslot, porder);
3312
3313 /* Update VRMASD field in the LPCR */
3314 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
3315 /* the -4 is to account for senc values starting at 0x10 */
3316 lpcr = senc << (LPCR_VRMASD_SH - 4);
3317 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
3318 } else {
3319 kvmppc_setup_partition_table(kvm);
3320 }
3321
3322 /* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */
3323 smp_wmb();
3324 kvm->arch.hpte_setup_done = 1;
3325 err = 0;
3326 out_srcu:
3327 srcu_read_unlock(&kvm->srcu, srcu_idx);
3328 out:
3329 mutex_unlock(&kvm->lock);
3330 return err;
3331
3332 up_out:
3333 up_read(&current->mm->mmap_sem);
3334 goto out_srcu;
3335 }
3336
3337 #ifdef CONFIG_KVM_XICS
3338 /*
3339 * Allocate a per-core structure for managing state about which cores are
3340 * running in the host versus the guest and for exchanging data between
3341 * real mode KVM and CPU running in the host.
3342 * This is only done for the first VM.
3343 * The allocated structure stays even if all VMs have stopped.
3344 * It is only freed when the kvm-hv module is unloaded.
3345 * It's OK for this routine to fail, we just don't support host
3346 * core operations like redirecting H_IPI wakeups.
3347 */
3348 void kvmppc_alloc_host_rm_ops(void)
3349 {
3350 struct kvmppc_host_rm_ops *ops;
3351 unsigned long l_ops;
3352 int cpu, core;
3353 int size;
3354
3355 /* Not the first time here ? */
3356 if (kvmppc_host_rm_ops_hv != NULL)
3357 return;
3358
3359 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
3360 if (!ops)
3361 return;
3362
3363 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
3364 ops->rm_core = kzalloc(size, GFP_KERNEL);
3365
3366 if (!ops->rm_core) {
3367 kfree(ops);
3368 return;
3369 }
3370
3371 cpus_read_lock();
3372
3373 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
3374 if (!cpu_online(cpu))
3375 continue;
3376
3377 core = cpu >> threads_shift;
3378 ops->rm_core[core].rm_state.in_host = 1;
3379 }
3380
3381 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
3382
3383 /*
3384 * Make the contents of the kvmppc_host_rm_ops structure visible
3385 * to other CPUs before we assign it to the global variable.
3386 * Do an atomic assignment (no locks used here), but if someone
3387 * beats us to it, just free our copy and return.
3388 */
3389 smp_wmb();
3390 l_ops = (unsigned long) ops;
3391
3392 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
3393 cpus_read_unlock();
3394 kfree(ops->rm_core);
3395 kfree(ops);
3396 return;
3397 }
3398
3399 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
3400 "ppc/kvm_book3s:prepare",
3401 kvmppc_set_host_core,
3402 kvmppc_clear_host_core);
3403 cpus_read_unlock();
3404 }
3405
3406 void kvmppc_free_host_rm_ops(void)
3407 {
3408 if (kvmppc_host_rm_ops_hv) {
3409 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
3410 kfree(kvmppc_host_rm_ops_hv->rm_core);
3411 kfree(kvmppc_host_rm_ops_hv);
3412 kvmppc_host_rm_ops_hv = NULL;
3413 }
3414 }
3415 #endif
3416
3417 static int kvmppc_core_init_vm_hv(struct kvm *kvm)
3418 {
3419 unsigned long lpcr, lpid;
3420 char buf[32];
3421 int ret;
3422
3423 /* Allocate the guest's logical partition ID */
3424
3425 lpid = kvmppc_alloc_lpid();
3426 if ((long)lpid < 0)
3427 return -ENOMEM;
3428 kvm->arch.lpid = lpid;
3429
3430 kvmppc_alloc_host_rm_ops();
3431
3432 /*
3433 * Since we don't flush the TLB when tearing down a VM,
3434 * and this lpid might have previously been used,
3435 * make sure we flush on each core before running the new VM.
3436 * On POWER9, the tlbie in mmu_partition_table_set_entry()
3437 * does this flush for us.
3438 */
3439 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3440 cpumask_setall(&kvm->arch.need_tlb_flush);
3441
3442 /* Start out with the default set of hcalls enabled */
3443 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
3444 sizeof(kvm->arch.enabled_hcalls));
3445
3446 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3447 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
3448
3449 /* Init LPCR for virtual RMA mode */
3450 kvm->arch.host_lpid = mfspr(SPRN_LPID);
3451 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
3452 lpcr &= LPCR_PECE | LPCR_LPES;
3453 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
3454 LPCR_VPM0 | LPCR_VPM1;
3455 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
3456 (VRMA_VSID << SLB_VSID_SHIFT_1T);
3457 /* On POWER8 turn on online bit to enable PURR/SPURR */
3458 if (cpu_has_feature(CPU_FTR_ARCH_207S))
3459 lpcr |= LPCR_ONL;
3460 /*
3461 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
3462 * Set HVICE bit to enable hypervisor virtualization interrupts.
3463 * Set HEIC to prevent OS interrupts to go to hypervisor (should
3464 * be unnecessary but better safe than sorry in case we re-enable
3465 * EE in HV mode with this LPCR still set)
3466 */
3467 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
3468 lpcr &= ~LPCR_VPM0;
3469 lpcr |= LPCR_HVICE | LPCR_HEIC;
3470
3471 /*
3472 * If xive is enabled, we route 0x500 interrupts directly
3473 * to the guest.
3474 */
3475 if (xive_enabled())
3476 lpcr |= LPCR_LPES;
3477 }
3478
3479 /*
3480 * For now, if the host uses radix, the guest must be radix.
3481 */
3482 if (radix_enabled()) {
3483 kvm->arch.radix = 1;
3484 lpcr &= ~LPCR_VPM1;
3485 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
3486 ret = kvmppc_init_vm_radix(kvm);
3487 if (ret) {
3488 kvmppc_free_lpid(kvm->arch.lpid);
3489 return ret;
3490 }
3491 kvmppc_setup_partition_table(kvm);
3492 }
3493
3494 kvm->arch.lpcr = lpcr;
3495
3496 /* Initialization for future HPT resizes */
3497 kvm->arch.resize_hpt = NULL;
3498
3499 /*
3500 * Work out how many sets the TLB has, for the use of
3501 * the TLB invalidation loop in book3s_hv_rmhandlers.S.
3502 */
3503 if (kvm_is_radix(kvm))
3504 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
3505 else if (cpu_has_feature(CPU_FTR_ARCH_300))
3506 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
3507 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
3508 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
3509 else
3510 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
3511
3512 /*
3513 * Track that we now have a HV mode VM active. This blocks secondary
3514 * CPU threads from coming online.
3515 * On POWER9, we only need to do this for HPT guests on a radix
3516 * host, which is not yet supported.
3517 */
3518 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3519 kvm_hv_vm_activated();
3520
3521 /*
3522 * Create a debugfs directory for the VM
3523 */
3524 snprintf(buf, sizeof(buf), "vm%d", current->pid);
3525 kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
3526 if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
3527 kvmppc_mmu_debugfs_init(kvm);
3528
3529 return 0;
3530 }
3531
3532 static void kvmppc_free_vcores(struct kvm *kvm)
3533 {
3534 long int i;
3535
3536 for (i = 0; i < KVM_MAX_VCORES; ++i)
3537 kfree(kvm->arch.vcores[i]);
3538 kvm->arch.online_vcores = 0;
3539 }
3540
3541 static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
3542 {
3543 debugfs_remove_recursive(kvm->arch.debugfs_dir);
3544
3545 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3546 kvm_hv_vm_deactivated();
3547
3548 kvmppc_free_vcores(kvm);
3549
3550 kvmppc_free_lpid(kvm->arch.lpid);
3551
3552 if (kvm_is_radix(kvm))
3553 kvmppc_free_radix(kvm);
3554 else
3555 kvmppc_free_hpt(&kvm->arch.hpt);
3556
3557 kvmppc_free_pimap(kvm);
3558 }
3559
3560 /* We don't need to emulate any privileged instructions or dcbz */
3561 static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
3562 unsigned int inst, int *advance)
3563 {
3564 return EMULATE_FAIL;
3565 }
3566
3567 static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
3568 ulong spr_val)
3569 {
3570 return EMULATE_FAIL;
3571 }
3572
3573 static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
3574 ulong *spr_val)
3575 {
3576 return EMULATE_FAIL;
3577 }
3578
3579 static int kvmppc_core_check_processor_compat_hv(void)
3580 {
3581 if (!cpu_has_feature(CPU_FTR_HVMODE) ||
3582 !cpu_has_feature(CPU_FTR_ARCH_206))
3583 return -EIO;
3584
3585 return 0;
3586 }
3587
3588 #ifdef CONFIG_KVM_XICS
3589
3590 void kvmppc_free_pimap(struct kvm *kvm)
3591 {
3592 kfree(kvm->arch.pimap);
3593 }
3594
3595 static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
3596 {
3597 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
3598 }
3599
3600 static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
3601 {
3602 struct irq_desc *desc;
3603 struct kvmppc_irq_map *irq_map;
3604 struct kvmppc_passthru_irqmap *pimap;
3605 struct irq_chip *chip;
3606 int i, rc = 0;
3607
3608 if (!kvm_irq_bypass)
3609 return 1;
3610
3611 desc = irq_to_desc(host_irq);
3612 if (!desc)
3613 return -EIO;
3614
3615 mutex_lock(&kvm->lock);
3616
3617 pimap = kvm->arch.pimap;
3618 if (pimap == NULL) {
3619 /* First call, allocate structure to hold IRQ map */
3620 pimap = kvmppc_alloc_pimap();
3621 if (pimap == NULL) {
3622 mutex_unlock(&kvm->lock);
3623 return -ENOMEM;
3624 }
3625 kvm->arch.pimap = pimap;
3626 }
3627
3628 /*
3629 * For now, we only support interrupts for which the EOI operation
3630 * is an OPAL call followed by a write to XIRR, since that's
3631 * what our real-mode EOI code does, or a XIVE interrupt
3632 */
3633 chip = irq_data_get_irq_chip(&desc->irq_data);
3634 if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) {
3635 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
3636 host_irq, guest_gsi);
3637 mutex_unlock(&kvm->lock);
3638 return -ENOENT;
3639 }
3640
3641 /*
3642 * See if we already have an entry for this guest IRQ number.
3643 * If it's mapped to a hardware IRQ number, that's an error,
3644 * otherwise re-use this entry.
3645 */
3646 for (i = 0; i < pimap->n_mapped; i++) {
3647 if (guest_gsi == pimap->mapped[i].v_hwirq) {
3648 if (pimap->mapped[i].r_hwirq) {
3649 mutex_unlock(&kvm->lock);
3650 return -EINVAL;
3651 }
3652 break;
3653 }
3654 }
3655
3656 if (i == KVMPPC_PIRQ_MAPPED) {
3657 mutex_unlock(&kvm->lock);
3658 return -EAGAIN; /* table is full */
3659 }
3660
3661 irq_map = &pimap->mapped[i];
3662
3663 irq_map->v_hwirq = guest_gsi;
3664 irq_map->desc = desc;
3665
3666 /*
3667 * Order the above two stores before the next to serialize with
3668 * the KVM real mode handler.
3669 */
3670 smp_wmb();
3671 irq_map->r_hwirq = desc->irq_data.hwirq;
3672
3673 if (i == pimap->n_mapped)
3674 pimap->n_mapped++;
3675
3676 if (xive_enabled())
3677 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc);
3678 else
3679 kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq);
3680 if (rc)
3681 irq_map->r_hwirq = 0;
3682
3683 mutex_unlock(&kvm->lock);
3684
3685 return 0;
3686 }
3687
3688 static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
3689 {
3690 struct irq_desc *desc;
3691 struct kvmppc_passthru_irqmap *pimap;
3692 int i, rc = 0;
3693
3694 if (!kvm_irq_bypass)
3695 return 0;
3696
3697 desc = irq_to_desc(host_irq);
3698 if (!desc)
3699 return -EIO;
3700
3701 mutex_lock(&kvm->lock);
3702 if (!kvm->arch.pimap)
3703 goto unlock;
3704
3705 pimap = kvm->arch.pimap;
3706
3707 for (i = 0; i < pimap->n_mapped; i++) {
3708 if (guest_gsi == pimap->mapped[i].v_hwirq)
3709 break;
3710 }
3711
3712 if (i == pimap->n_mapped) {
3713 mutex_unlock(&kvm->lock);
3714 return -ENODEV;
3715 }
3716
3717 if (xive_enabled())
3718 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc);
3719 else
3720 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
3721
3722 /* invalidate the entry (what do do on error from the above ?) */
3723 pimap->mapped[i].r_hwirq = 0;
3724
3725 /*
3726 * We don't free this structure even when the count goes to
3727 * zero. The structure is freed when we destroy the VM.
3728 */
3729 unlock:
3730 mutex_unlock(&kvm->lock);
3731 return rc;
3732 }
3733
3734 static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
3735 struct irq_bypass_producer *prod)
3736 {
3737 int ret = 0;
3738 struct kvm_kernel_irqfd *irqfd =
3739 container_of(cons, struct kvm_kernel_irqfd, consumer);
3740
3741 irqfd->producer = prod;
3742
3743 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
3744 if (ret)
3745 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
3746 prod->irq, irqfd->gsi, ret);
3747
3748 return ret;
3749 }
3750
3751 static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
3752 struct irq_bypass_producer *prod)
3753 {
3754 int ret;
3755 struct kvm_kernel_irqfd *irqfd =
3756 container_of(cons, struct kvm_kernel_irqfd, consumer);
3757
3758 irqfd->producer = NULL;
3759
3760 /*
3761 * When producer of consumer is unregistered, we change back to
3762 * default external interrupt handling mode - KVM real mode
3763 * will switch back to host.
3764 */
3765 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
3766 if (ret)
3767 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
3768 prod->irq, irqfd->gsi, ret);
3769 }
3770 #endif
3771
3772 static long kvm_arch_vm_ioctl_hv(struct file *filp,
3773 unsigned int ioctl, unsigned long arg)
3774 {
3775 struct kvm *kvm __maybe_unused = filp->private_data;
3776 void __user *argp = (void __user *)arg;
3777 long r;
3778
3779 switch (ioctl) {
3780
3781 case KVM_PPC_ALLOCATE_HTAB: {
3782 u32 htab_order;
3783
3784 r = -EFAULT;
3785 if (get_user(htab_order, (u32 __user *)argp))
3786 break;
3787 r = kvmppc_alloc_reset_hpt(kvm, htab_order);
3788 if (r)
3789 break;
3790 r = 0;
3791 break;
3792 }
3793
3794 case KVM_PPC_GET_HTAB_FD: {
3795 struct kvm_get_htab_fd ghf;
3796
3797 r = -EFAULT;
3798 if (copy_from_user(&ghf, argp, sizeof(ghf)))
3799 break;
3800 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
3801 break;
3802 }
3803
3804 case KVM_PPC_RESIZE_HPT_PREPARE: {
3805 struct kvm_ppc_resize_hpt rhpt;
3806
3807 r = -EFAULT;
3808 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
3809 break;
3810
3811 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
3812 break;
3813 }
3814
3815 case KVM_PPC_RESIZE_HPT_COMMIT: {
3816 struct kvm_ppc_resize_hpt rhpt;
3817
3818 r = -EFAULT;
3819 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
3820 break;
3821
3822 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
3823 break;
3824 }
3825
3826 default:
3827 r = -ENOTTY;
3828 }
3829
3830 return r;
3831 }
3832
3833 /*
3834 * List of hcall numbers to enable by default.
3835 * For compatibility with old userspace, we enable by default
3836 * all hcalls that were implemented before the hcall-enabling
3837 * facility was added. Note this list should not include H_RTAS.
3838 */
3839 static unsigned int default_hcall_list[] = {
3840 H_REMOVE,
3841 H_ENTER,
3842 H_READ,
3843 H_PROTECT,
3844 H_BULK_REMOVE,
3845 H_GET_TCE,
3846 H_PUT_TCE,
3847 H_SET_DABR,
3848 H_SET_XDABR,
3849 H_CEDE,
3850 H_PROD,
3851 H_CONFER,
3852 H_REGISTER_VPA,
3853 #ifdef CONFIG_KVM_XICS
3854 H_EOI,
3855 H_CPPR,
3856 H_IPI,
3857 H_IPOLL,
3858 H_XIRR,
3859 H_XIRR_X,
3860 #endif
3861 0
3862 };
3863
3864 static void init_default_hcalls(void)
3865 {
3866 int i;
3867 unsigned int hcall;
3868
3869 for (i = 0; default_hcall_list[i]; ++i) {
3870 hcall = default_hcall_list[i];
3871 WARN_ON(!kvmppc_hcall_impl_hv(hcall));
3872 __set_bit(hcall / 4, default_enabled_hcalls);
3873 }
3874 }
3875
3876 static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
3877 {
3878 unsigned long lpcr;
3879 int radix;
3880
3881 /* If not on a POWER9, reject it */
3882 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3883 return -ENODEV;
3884
3885 /* If any unknown flags set, reject it */
3886 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
3887 return -EINVAL;
3888
3889 /* We can't change a guest to/from radix yet */
3890 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
3891 if (radix != kvm_is_radix(kvm))
3892 return -EINVAL;
3893
3894 /* GR (guest radix) bit in process_table field must match */
3895 if (!!(cfg->process_table & PATB_GR) != radix)
3896 return -EINVAL;
3897
3898 /* Process table size field must be reasonable, i.e. <= 24 */
3899 if ((cfg->process_table & PRTS_MASK) > 24)
3900 return -EINVAL;
3901
3902 kvm->arch.process_table = cfg->process_table;
3903 kvmppc_setup_partition_table(kvm);
3904
3905 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
3906 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
3907
3908 return 0;
3909 }
3910
3911 static struct kvmppc_ops kvm_ops_hv = {
3912 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
3913 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
3914 .get_one_reg = kvmppc_get_one_reg_hv,
3915 .set_one_reg = kvmppc_set_one_reg_hv,
3916 .vcpu_load = kvmppc_core_vcpu_load_hv,
3917 .vcpu_put = kvmppc_core_vcpu_put_hv,
3918 .set_msr = kvmppc_set_msr_hv,
3919 .vcpu_run = kvmppc_vcpu_run_hv,
3920 .vcpu_create = kvmppc_core_vcpu_create_hv,
3921 .vcpu_free = kvmppc_core_vcpu_free_hv,
3922 .check_requests = kvmppc_core_check_requests_hv,
3923 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
3924 .flush_memslot = kvmppc_core_flush_memslot_hv,
3925 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
3926 .commit_memory_region = kvmppc_core_commit_memory_region_hv,
3927 .unmap_hva = kvm_unmap_hva_hv,
3928 .unmap_hva_range = kvm_unmap_hva_range_hv,
3929 .age_hva = kvm_age_hva_hv,
3930 .test_age_hva = kvm_test_age_hva_hv,
3931 .set_spte_hva = kvm_set_spte_hva_hv,
3932 .mmu_destroy = kvmppc_mmu_destroy_hv,
3933 .free_memslot = kvmppc_core_free_memslot_hv,
3934 .create_memslot = kvmppc_core_create_memslot_hv,
3935 .init_vm = kvmppc_core_init_vm_hv,
3936 .destroy_vm = kvmppc_core_destroy_vm_hv,
3937 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
3938 .emulate_op = kvmppc_core_emulate_op_hv,
3939 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
3940 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
3941 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
3942 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
3943 .hcall_implemented = kvmppc_hcall_impl_hv,
3944 #ifdef CONFIG_KVM_XICS
3945 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
3946 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
3947 #endif
3948 .configure_mmu = kvmhv_configure_mmu,
3949 .get_rmmu_info = kvmhv_get_rmmu_info,
3950 };
3951
3952 static int kvm_init_subcore_bitmap(void)
3953 {
3954 int i, j;
3955 int nr_cores = cpu_nr_cores();
3956 struct sibling_subcore_state *sibling_subcore_state;
3957
3958 for (i = 0; i < nr_cores; i++) {
3959 int first_cpu = i * threads_per_core;
3960 int node = cpu_to_node(first_cpu);
3961
3962 /* Ignore if it is already allocated. */
3963 if (paca[first_cpu].sibling_subcore_state)
3964 continue;
3965
3966 sibling_subcore_state =
3967 kmalloc_node(sizeof(struct sibling_subcore_state),
3968 GFP_KERNEL, node);
3969 if (!sibling_subcore_state)
3970 return -ENOMEM;
3971
3972 memset(sibling_subcore_state, 0,
3973 sizeof(struct sibling_subcore_state));
3974
3975 for (j = 0; j < threads_per_core; j++) {
3976 int cpu = first_cpu + j;
3977
3978 paca[cpu].sibling_subcore_state = sibling_subcore_state;
3979 }
3980 }
3981 return 0;
3982 }
3983
3984 static int kvmppc_radix_possible(void)
3985 {
3986 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
3987 }
3988
3989 static int kvmppc_book3s_init_hv(void)
3990 {
3991 int r;
3992 /*
3993 * FIXME!! Do we need to check on all cpus ?
3994 */
3995 r = kvmppc_core_check_processor_compat_hv();
3996 if (r < 0)
3997 return -ENODEV;
3998
3999 r = kvm_init_subcore_bitmap();
4000 if (r)
4001 return r;
4002
4003 /*
4004 * We need a way of accessing the XICS interrupt controller,
4005 * either directly, via paca[cpu].kvm_hstate.xics_phys, or
4006 * indirectly, via OPAL.
4007 */
4008 #ifdef CONFIG_SMP
4009 if (!xive_enabled() && !local_paca->kvm_hstate.xics_phys) {
4010 struct device_node *np;
4011
4012 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
4013 if (!np) {
4014 pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
4015 return -ENODEV;
4016 }
4017 }
4018 #endif
4019
4020 kvm_ops_hv.owner = THIS_MODULE;
4021 kvmppc_hv_ops = &kvm_ops_hv;
4022
4023 init_default_hcalls();
4024
4025 init_vcore_lists();
4026
4027 r = kvmppc_mmu_hv_init();
4028 if (r)
4029 return r;
4030
4031 if (kvmppc_radix_possible())
4032 r = kvmppc_radix_init();
4033 return r;
4034 }
4035
4036 static void kvmppc_book3s_exit_hv(void)
4037 {
4038 kvmppc_free_host_rm_ops();
4039 if (kvmppc_radix_possible())
4040 kvmppc_radix_exit();
4041 kvmppc_hv_ops = NULL;
4042 }
4043
4044 module_init(kvmppc_book3s_init_hv);
4045 module_exit(kvmppc_book3s_exit_hv);
4046 MODULE_LICENSE("GPL");
4047 MODULE_ALIAS_MISCDEV(KVM_MINOR);
4048 MODULE_ALIAS("devname:kvm");
4049
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