]> Git Repo - linux.git/blame - arch/powerpc/kvm/book3s_hv.c
projects / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
KVM: PPC: Book3S HV: Save/restore host values of debug registers
[linux.git] / arch / powerpc / kvm / book3s_hv.c
CommitLineData
de56a948
PM		 1/*
2 * Copyright 2011 Paul Mackerras, IBM Corp. <[email protected]>
3 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
4 *
5 * Authors:
6 * Paul Mackerras <[email protected]>
7 * Alexander Graf <[email protected]>
8 * Kevin Wolf <[email protected]>
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 <[email protected]>.
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>
174cd4b1 25#include <linux/sched/signal.h>
03441a34 26#include <linux/sched/stat.h>
de56a948 27#include <linux/delay.h>
66b15db6 28#include <linux/export.h>
de56a948
PM		 29#include <linux/fs.h>
30#include <linux/anon_inodes.h>
07f8ab25 31#include <linux/cpu.h>
de56a948 32#include <linux/cpumask.h>
aa04b4cc
PM		 33#include <linux/spinlock.h>
34#include <linux/page-flags.h>
2c9097e4 35#include <linux/srcu.h>
398a76c6 36#include <linux/miscdevice.h>
e23a808b 37#include <linux/debugfs.h>
d3989143
BH		 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>
de56a948
PM		 47
48#include <asm/reg.h>
49#include <asm/cputable.h>
50#include <asm/cacheflush.h>
51#include <asm/tlbflush.h>
7c0f6ba6 52#include <linux/uaccess.h>
de56a948
PM		 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>
371fefd6 59#include <asm/cputhreads.h>
aa04b4cc 60#include <asm/page.h>
de1d9248 61#include <asm/hvcall.h>
ae3a197e 62#include <asm/switch_to.h>
512691d4 63#include <asm/smp.h>
66feed61 64#include <asm/dbell.h>
fd7bacbc 65#include <asm/hmi.h>
c57875f5 66#include <asm/pnv-pci.h>
7a84084c 67#include <asm/mmu.h>
f725758b
PM		 68#include <asm/opal.h>
69#include <asm/xics.h>
5af50993 70#include <asm/xive.h>
de56a948 71
3a167bea
AK		 72#include "book3s.h"
73
3c78f78a
SW		 74#define CREATE_TRACE_POINTS
75#include "trace_hv.h"
76
de56a948
PM		 77/* #define EXIT_DEBUG */
78/* #define EXIT_DEBUG_SIMPLE */
79/* #define EXIT_DEBUG_INT */
80
913d3ff9
PM		 81/* Used to indicate that a guest page fault needs to be handled */
82#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
f7af5209
SW		 83/* Used to indicate that a guest passthrough interrupt needs to be handled */
84#define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
913d3ff9 85
c7b67670
PM		 86/* Used as a "null" value for timebase values */
87#define TB_NIL (~(u64)0)
88
699a0ea0
PM		 89static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
90
b4deba5c
PM		 91static int dynamic_mt_modes = 6;
92module_param(dynamic_mt_modes, int, S_IRUGO | S_IWUSR);
93MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
ec257165
PM		 94static int target_smt_mode;
95module_param(target_smt_mode, int, S_IRUGO | S_IWUSR);
96MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
9678cdaa 97
520fe9c6
SW		 98#ifdef CONFIG_KVM_XICS
99static struct kernel_param_ops module_param_ops = {
100 .set = param_set_int,
101 .get = param_get_int,
102};
103
644abbb2
SW		 104module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass,
105 S_IRUGO | S_IWUSR);
106MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
107
520fe9c6
SW		 108module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect,
109 S_IRUGO | S_IWUSR);
110MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
111#endif
112
19ccb76a 113static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
32fad281 114static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
19ccb76a 115
7b5f8272
SJS		 116static 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
66feed61
PM		 136static bool kvmppc_ipi_thread(int cpu)
137{
1704a81c
PM		 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
66feed61
PM		 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())) {
66feed61
PM		 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)
f725758b
PM		 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);
66feed61
PM		 169 return true;
170 }
171#endif
172
173 return false;
174}
175
3a167bea 176static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
54695c30 177{
ec257165 178 int cpu;
8577370f 179 struct swait_queue_head *wqp;
54695c30
BH		 180
181 wqp = kvm_arch_vcpu_wq(vcpu);
8577370f
MT		 182 if (swait_active(wqp)) {
183 swake_up(wqp);
54695c30
BH		 184 ++vcpu->stat.halt_wakeup;
185 }
186
3deda5e5
PM		 187 cpu = READ_ONCE(vcpu->arch.thread_cpu);
188 if (cpu >= 0 && kvmppc_ipi_thread(cpu))
66feed61 189 return;
54695c30
BH		 190
191 /* CPU points to the first thread of the core */
ec257165 192 cpu = vcpu->cpu;
66feed61
PM		 193 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
194 smp_send_reschedule(cpu);
54695c30
BH		 195}
196
c7b67670
PM		 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;
2711e248
PM		 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.)
c7b67670
PM		 228 */
229
ec257165
PM		 230static 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
239static 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
3a167bea 251static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
de56a948 252{
0456ec4f 253 struct kvmppc_vcore *vc = vcpu->arch.vcore;
bf3d32e1 254 unsigned long flags;
0456ec4f 255
2711e248
PM		 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 */
ec257165
PM		 262 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
263 kvmppc_core_end_stolen(vc);
264
2711e248 265 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
c7b67670
PM		 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 }
bf3d32e1 271 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
de56a948
PM		 272}
273
3a167bea 274static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
de56a948 275{
0456ec4f 276 struct kvmppc_vcore *vc = vcpu->arch.vcore;
bf3d32e1 277 unsigned long flags;
0456ec4f 278
ec257165
PM		 279 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
280 kvmppc_core_start_stolen(vc);
281
2711e248 282 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
c7b67670
PM		 283 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
284 vcpu->arch.busy_preempt = mftb();
bf3d32e1 285 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
de56a948
PM		 286}
287
3a167bea 288static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
de56a948 289{
c20875a3
PM		 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;
de56a948 296 vcpu->arch.shregs.msr = msr;
19ccb76a 297 kvmppc_end_cede(vcpu);
de56a948
PM		 298}
299
5358a963 300static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
de56a948
PM		 301{
302 vcpu->arch.pvr = pvr;
303}
304
2ee13be3
SJS		 305/* Dummy value used in computing PCR value below */
306#define PCR_ARCH_300 (PCR_ARCH_207 << 1)
307
5358a963 308static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
388cc6e1 309{
2ee13be3 310 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
388cc6e1
PM		 311 struct kvmppc_vcore *vc = vcpu->arch.vcore;
312
2ee13be3
SJS		 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;
388cc6e1 325 if (arch_compat) {
388cc6e1
PM		 326 switch (arch_compat) {
327 case PVR_ARCH_205:
2ee13be3 328 guest_pcr_bit = PCR_ARCH_205;
388cc6e1
PM		 329 break;
330 case PVR_ARCH_206:
331 case PVR_ARCH_206p:
2ee13be3 332 guest_pcr_bit = PCR_ARCH_206;
5557ae0e
PM		 333 break;
334 case PVR_ARCH_207:
2ee13be3
SJS		 335 guest_pcr_bit = PCR_ARCH_207;
336 break;
337 case PVR_ARCH_300:
338 guest_pcr_bit = PCR_ARCH_300;
388cc6e1
PM		 339 break;
340 default:
341 return -EINVAL;
342 }
343 }
344
2ee13be3
SJS		 345 /* Check requested PCR bits don't exceed our capabilities */
346 if (guest_pcr_bit > host_pcr_bit)
347 return -EINVAL;
348
388cc6e1
PM		 349 spin_lock(&vc->lock);
350 vc->arch_compat = arch_compat;
2ee13be3
SJS		 351 /* Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit */
352 vc->pcr = host_pcr_bit - guest_pcr_bit;
388cc6e1
PM		 353 spin_unlock(&vc->lock);
354
355 return 0;
356}
357
5358a963 358static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
de56a948
PM		 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",
a0144e2a 387 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
de56a948
PM		 388 vcpu->arch.last_inst);
389}
390
5358a963 391static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
a8606e20 392{
e09fefde 393 struct kvm_vcpu *ret;
a8606e20
PM		 394
395 mutex_lock(&kvm->lock);
e09fefde 396 ret = kvm_get_vcpu_by_id(kvm, id);
a8606e20
PM		 397 mutex_unlock(&kvm->lock);
398 return ret;
399}
400
401static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
402{
f13c13a0 403 vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
02407552 404 vpa->yield_count = cpu_to_be32(1);
a8606e20
PM		 405}
406
55b665b0
PM		 407static 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
2e25aa5f
PM		 423/* Length for a per-processor buffer is passed in at offset 4 in the buffer */
424struct reg_vpa {
425 u32 dummy;
426 union {
02407552
AG		 427 __be16 hword;
428 __be32 word;
2e25aa5f
PM		 429 } length;
430};
431
432static 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
a8606e20
PM		 439static 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;
93e60249 444 unsigned long len, nb;
a8606e20
PM		 445 void *va;
446 struct kvm_vcpu *tvcpu;
2e25aa5f
PM		 447 int err;
448 int subfunc;
449 struct kvmppc_vpa *vpap;
a8606e20
PM		 450
451 tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
452 if (!tvcpu)
453 return H_PARAMETER;
454
2e25aa5f
PM		 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)
a8606e20 460 return H_PARAMETER;
2e25aa5f
PM		 461
462 /* convert logical addr to kernel addr and read length */
93e60249
PM		 463 va = kvmppc_pin_guest_page(kvm, vpa, &nb);
464 if (va == NULL)
b2b2f165 465 return H_PARAMETER;
2e25aa5f 466 if (subfunc == H_VPA_REG_VPA)
02407552 467 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
a8606e20 468 else
02407552 469 len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
c35635ef 470 kvmppc_unpin_guest_page(kvm, va, vpa, false);
2e25aa5f
PM		 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))
a8606e20 487 break;
2e25aa5f
PM		 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))
a8606e20 494 break;
2e25aa5f
PM		 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))
a8606e20 500 break;
2e25aa5f
PM		 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))
a8606e20 510 break;
2e25aa5f
PM		 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))
a8606e20 521 break;
2e25aa5f
PM		 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;
a8606e20 542 }
93e60249 543
2e25aa5f
PM		 544 spin_unlock(&tvcpu->arch.vpa_update_lock);
545
93e60249 546 return err;
a8606e20
PM		 547}
548
081f323b 549static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
2e25aa5f 550{
081f323b 551 struct kvm *kvm = vcpu->kvm;
2e25aa5f
PM		 552 void *va;
553 unsigned long nb;
081f323b 554 unsigned long gpa;
2e25aa5f 555
081f323b
PM		 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)
c35635ef 570 va = kvmppc_pin_guest_page(kvm, gpa, &nb);
081f323b
PM		 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)
c35635ef 576 kvmppc_unpin_guest_page(kvm, va, gpa, false);
081f323b
PM		 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 */
c35635ef 586 kvmppc_unpin_guest_page(kvm, va, gpa, false);
081f323b 587 va = NULL;
2e25aa5f
PM		 588 }
589 if (vpap->pinned_addr)
c35635ef
PM		 590 kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
591 vpap->dirty);
592 vpap->gpa = gpa;
2e25aa5f 593 vpap->pinned_addr = va;
c35635ef 594 vpap->dirty = false;
2e25aa5f
PM		 595 if (va)
596 vpap->pinned_end = va + vpap->len;
597}
598
599static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
600{
2f12f034
PM		 601 if (!(vcpu->arch.vpa.update_pending ||
602 vcpu->arch.slb_shadow.update_pending ||
603 vcpu->arch.dtl.update_pending))
604 return;
605
2e25aa5f
PM		 606 spin_lock(&vcpu->arch.vpa_update_lock);
607 if (vcpu->arch.vpa.update_pending) {
081f323b 608 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
55b665b0
PM		 609 if (vcpu->arch.vpa.pinned_addr)
610 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
2e25aa5f
PM		 611 }
612 if (vcpu->arch.dtl.update_pending) {
081f323b 613 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
2e25aa5f
PM		 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)
081f323b 618 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
2e25aa5f
PM		 619 spin_unlock(&vcpu->arch.vpa_update_lock);
620}
621
c7b67670
PM		 622/*
623 * Return the accumulated stolen time for the vcore up until `now'.
624 * The caller should hold the vcore lock.
625 */
626static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
627{
628 u64 p;
2711e248 629 unsigned long flags;
c7b67670 630
2711e248
PM		 631 spin_lock_irqsave(&vc->stoltb_lock, flags);
632 p = vc->stolen_tb;
c7b67670 633 if (vc->vcore_state != VCORE_INACTIVE &&
2711e248
PM		 634 vc->preempt_tb != TB_NIL)
635 p += now - vc->preempt_tb;
636 spin_unlock_irqrestore(&vc->stoltb_lock, flags);
c7b67670
PM		 637 return p;
638}
639
0456ec4f
PM		 640static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
641 struct kvmppc_vcore *vc)
642{
643 struct dtl_entry *dt;
644 struct lppaca *vpa;
c7b67670
PM		 645 unsigned long stolen;
646 unsigned long core_stolen;
647 u64 now;
0456ec4f
PM		 648
649 dt = vcpu->arch.dtl_ptr;
650 vpa = vcpu->arch.vpa.pinned_addr;
c7b67670
PM		 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;
bf3d32e1 655 spin_lock_irq(&vcpu->arch.tbacct_lock);
c7b67670
PM		 656 stolen += vcpu->arch.busy_stolen;
657 vcpu->arch.busy_stolen = 0;
bf3d32e1 658 spin_unlock_irq(&vcpu->arch.tbacct_lock);
0456ec4f
PM		 659 if (!dt || !vpa)
660 return;
661 memset(dt, 0, sizeof(struct dtl_entry));
662 dt->dispatch_reason = 7;
02407552
AG		 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);
0456ec4f
PM		 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();
02407552 674 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
c35635ef 675 vcpu->arch.dtl.dirty = true;
0456ec4f
PM		 676}
677
9642382e
MN		 678static 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
688static 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
90fd09f8
SB		 720static 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 &&
ec257165
PM		 734 vcore->vcore_state != VCORE_INACTIVE &&
735 vcore->runner)
90fd09f8
SB		 736 target = vcore->runner;
737 spin_unlock(&vcore->lock);
738
739 return kvm_vcpu_yield_to(target);
740}
741
742static 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)
ecb6d618 750 yield_count = be32_to_cpu(lppaca->yield_count);
90fd09f8
SB		 751 spin_unlock(&vcpu->arch.vpa_update_lock);
752 return yield_count;
753}
754
a8606e20
PM		 755int 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;
90fd09f8 759 int yield_count;
a8606e20 760 struct kvm_vcpu *tvcpu;
8e591cb7 761 int idx, rc;
a8606e20 762
699a0ea0
PM		 763 if (req <= MAX_HCALL_OPCODE &&
764 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
765 return RESUME_HOST;
766
a8606e20
PM		 767 switch (req) {
768 case H_CEDE:
a8606e20
PM		 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();
8464c884
PM		 779 if (tvcpu->arch.ceded)
780 kvmppc_fast_vcpu_kick_hv(tvcpu);
a8606e20
PM		 781 break;
782 case H_CONFER:
42d7604d
PM		 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 }
90fd09f8
SB		 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);
a8606e20
PM		 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;
8e591cb7
ME		 801 case H_RTAS:
802 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
803 return RESUME_HOST;
804
c9438092 805 idx = srcu_read_lock(&vcpu->kvm->srcu);
8e591cb7 806 rc = kvmppc_rtas_hcall(vcpu);
c9438092 807 srcu_read_unlock(&vcpu->kvm->srcu, idx);
8e591cb7
ME		 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;
99342cf8
DG		 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;
9642382e
MN		 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;
bc5ad3f3
BH		 834 case H_XIRR:
835 case H_CPPR:
836 case H_EOI:
837 case H_IPI:
8e44ddc3
PM		 838 case H_IPOLL:
839 case H_XIRR_X:
bc5ad3f3 840 if (kvmppc_xics_enabled(vcpu)) {
5af50993
BH		 841 if (xive_enabled()) {
842 ret = H_NOT_AVAILABLE;
843 return RESUME_GUEST;
844 }
bc5ad3f3
BH		 845 ret = kvmppc_xics_hcall(vcpu, req);
846 break;
d3695aa4
AK		 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;
a8606e20
PM		 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
ae2113a4
PM		 880static 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:
9642382e 887 case H_SET_MODE:
99342cf8
DG		 888 case H_LOGICAL_CI_LOAD:
889 case H_LOGICAL_CI_STORE:
ae2113a4
PM		 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
a59c1d9e
MS		 905static 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
3a167bea
AK		 929static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
930 struct task_struct *tsk)
de56a948
PM		 931{
932 int r = RESUME_HOST;
933
934 vcpu->stat.sum_exits++;
935
1c9e3d51
PM		 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 }
de56a948
PM		 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:
5d00f66b 963 case BOOK3S_INTERRUPT_H_DOORBELL:
84f7139c 964 case BOOK3S_INTERRUPT_H_VIRT:
de56a948
PM		 965 vcpu->stat.ext_intr_exits++;
966 r = RESUME_GUEST;
967 break;
dee6f24c
MS		 968 /* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
969 case BOOK3S_INTERRUPT_HMI:
de56a948
PM		 970 case BOOK3S_INTERRUPT_PERFMON:
971 r = RESUME_GUEST;
972 break;
b4072df4
PM		 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;
de56a948
PM		 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
27025a60
LPF		 1003 /* hypercall with MSR_PR has already been handled in rmode,
1004 * and never reaches here.
1005 */
1006
de56a948
PM		 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 /*
342d3db7
PM		 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.
de56a948
PM		 1021 */
1022 case BOOK3S_INTERRUPT_H_DATA_STORAGE:
913d3ff9 1023 r = RESUME_PAGE_FAULT;
de56a948
PM		 1024 break;
1025 case BOOK3S_INTERRUPT_H_INST_STORAGE:
913d3ff9
PM		 1026 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
1027 vcpu->arch.fault_dsisr = 0;
1028 r = RESUME_PAGE_FAULT;
de56a948
PM		 1029 break;
1030 /*
1031 * This occurs if the guest executes an illegal instruction.
a59c1d9e
MS		 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.
de56a948
PM		 1036 */
1037 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
4a157d61
PM		 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;
a59c1d9e
MS		 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 }
bd3048b8
ME		 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);
de56a948
PM		 1056 r = RESUME_GUEST;
1057 break;
f7af5209
SW		 1058 case BOOK3S_INTERRUPT_HV_RM_HARD:
1059 r = RESUME_PASSTHROUGH;
1060 break;
de56a948
PM		 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);
f3271d4c 1066 run->hw.hardware_exit_reason = vcpu->arch.trap;
de56a948 1067 r = RESUME_HOST;
de56a948
PM		 1068 break;
1069 }
1070
de56a948
PM		 1071 return r;
1072}
1073
3a167bea
AK		 1074static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
1075 struct kvm_sregs *sregs)
de56a948
PM		 1076{
1077 int i;
1078
de56a948 1079 memset(sregs, 0, sizeof(struct kvm_sregs));
87916442 1080 sregs->pvr = vcpu->arch.pvr;
de56a948
PM		 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
3a167bea
AK		 1089static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
1090 struct kvm_sregs *sregs)
de56a948
PM		 1091{
1092 int i, j;
1093
9333e6c4
PM		 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;
de56a948
PM		 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
a0840240
AK		 1111static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
1112 bool preserve_top32)
a0144e2a 1113{
8f902b00 1114 struct kvm *kvm = vcpu->kvm;
a0144e2a
PM		 1115 struct kvmppc_vcore *vc = vcpu->arch.vcore;
1116 u64 mask;
1117
8f902b00 1118 mutex_lock(&kvm->lock);
a0144e2a 1119 spin_lock(&vc->lock);
d682916a
AB		 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)) {
d682916a
AB		 1125 struct kvm_vcpu *vcpu;
1126 int i;
1127
d682916a
AB		 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 }
d682916a
AB		 1136 }
1137
a0144e2a
PM		 1138 /*
1139 * Userspace can only modify DPFD (default prefetch depth),
1140 * ILE (interrupt little-endian) and TC (translation control).
8cf4ecc0 1141 * On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
a0144e2a
PM		 1142 */
1143 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
e0622bd9
PM		 1144 if (cpu_has_feature(CPU_FTR_ARCH_207S))
1145 mask |= LPCR_AIL;
a0840240
AK		 1146
1147 /* Broken 32-bit version of LPCR must not clear top bits */
1148 if (preserve_top32)
1149 mask &= 0xFFFFFFFF;
a0144e2a
PM		 1150 vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
1151 spin_unlock(&vc->lock);
8f902b00 1152 mutex_unlock(&kvm->lock);
a0144e2a
PM		 1153}
1154
3a167bea
AK		 1155static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1156 union kvmppc_one_reg *val)
31f3438e 1157{
a136a8bd
PM		 1158 int r = 0;
1159 long int i;
31f3438e 1160
a136a8bd 1161 switch (id) {
a59c1d9e
MS		 1162 case KVM_REG_PPC_DEBUG_INST:
1163 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1164 break;
31f3438e 1165 case KVM_REG_PPC_HIOR:
a136a8bd
PM		 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;
8563bf52
PM		 1171 case KVM_REG_PPC_DABRX:
1172 *val = get_reg_val(id, vcpu->arch.dabrx);
1173 break;
a136a8bd
PM		 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;
b005255e 1189 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
a136a8bd
PM		 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]);
31f3438e 1196 break;
b005255e
MN		 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;
14941789
PM		 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;
b005255e
MN		 1207 case KVM_REG_PPC_SIER:
1208 *val = get_reg_val(id, vcpu->arch.sier);
a8bd19ef 1209 break;
b005255e
MN		 1210 case KVM_REG_PPC_IAMR:
1211 *val = get_reg_val(id, vcpu->arch.iamr);
1212 break;
b005255e
MN		 1213 case KVM_REG_PPC_PSPB:
1214 *val = get_reg_val(id, vcpu->arch.pspb);
1215 break;
b005255e
MN		 1216 case KVM_REG_PPC_DPDES:
1217 *val = get_reg_val(id, vcpu->arch.vcore->dpdes);
1218 break;
88b02cf9
PM		 1219 case KVM_REG_PPC_VTB:
1220 *val = get_reg_val(id, vcpu->arch.vcore->vtb);
1221 break;
b005255e
MN		 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;
b005255e
MN		 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);
a8bd19ef 1248 break;
e9cf1e08
PM		 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;
55b665b0
PM		 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;
93b0f4dc
PM		 1272 case KVM_REG_PPC_TB_OFFSET:
1273 *val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
1274 break;
a0144e2a 1275 case KVM_REG_PPC_LPCR:
a0840240 1276 case KVM_REG_PPC_LPCR_64:
a0144e2a
PM		 1277 *val = get_reg_val(id, vcpu->arch.vcore->lpcr);
1278 break;
4b8473c9
PM		 1279 case KVM_REG_PPC_PPR:
1280 *val = get_reg_val(id, vcpu->arch.ppr);
1281 break;
a7d80d01
MN		 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;
0d808df0
PM		 1314 case KVM_REG_PPC_TM_XER:
1315 *val = get_reg_val(id, vcpu->arch.xer_tm);
1316 break;
a7d80d01
MN		 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
388cc6e1
PM		 1348 case KVM_REG_PPC_ARCH_COMPAT:
1349 *val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
1350 break;
31f3438e 1351 default:
a136a8bd 1352 r = -EINVAL;
31f3438e
PM		 1353 break;
1354 }
1355
1356 return r;
1357}
1358
3a167bea
AK		 1359static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
1360 union kvmppc_one_reg *val)
31f3438e 1361{
a136a8bd
PM		 1362 int r = 0;
1363 long int i;
55b665b0 1364 unsigned long addr, len;
31f3438e 1365
a136a8bd 1366 switch (id) {
31f3438e 1367 case KVM_REG_PPC_HIOR:
31f3438e 1368 /* Only allow this to be set to zero */
a136a8bd 1369 if (set_reg_val(id, *val))
31f3438e
PM		 1370 r = -EINVAL;
1371 break;
a136a8bd
PM		 1372 case KVM_REG_PPC_DABR:
1373 vcpu->arch.dabr = set_reg_val(id, *val);
1374 break;
8563bf52
PM		 1375 case KVM_REG_PPC_DABRX:
1376 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
1377 break;
a136a8bd
PM		 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;
b005255e 1393 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
a136a8bd
PM		 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;
b005255e
MN		 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;
14941789
PM		 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;
b005255e
MN		 1411 case KVM_REG_PPC_SIER:
1412 vcpu->arch.sier = set_reg_val(id, *val);
a8bd19ef 1413 break;
b005255e
MN		 1414 case KVM_REG_PPC_IAMR:
1415 vcpu->arch.iamr = set_reg_val(id, *val);
1416 break;
b005255e
MN		 1417 case KVM_REG_PPC_PSPB:
1418 vcpu->arch.pspb = set_reg_val(id, *val);
1419 break;
b005255e
MN		 1420 case KVM_REG_PPC_DPDES:
1421 vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
1422 break;
88b02cf9
PM		 1423 case KVM_REG_PPC_VTB:
1424 vcpu->arch.vcore->vtb = set_reg_val(id, *val);
1425 break;
b005255e
MN		 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;
b005255e
MN		 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);
a8bd19ef 1455 break;
e9cf1e08
PM		 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;
55b665b0
PM		 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;
9f8c8c78
PM		 1482 if (addr && (len < sizeof(struct dtl_entry) ||
1483 !vcpu->arch.vpa.next_gpa))
55b665b0
PM		 1484 break;
1485 len -= len % sizeof(struct dtl_entry);
1486 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
1487 break;
93b0f4dc
PM		 1488 case KVM_REG_PPC_TB_OFFSET:
1489 /* round up to multiple of 2^24 */
1490 vcpu->arch.vcore->tb_offset =
1491 ALIGN(set_reg_val(id, *val), 1UL << 24);
1492 break;
a0144e2a 1493 case KVM_REG_PPC_LPCR:
a0840240
AK		 1494 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
1495 break;
1496 case KVM_REG_PPC_LPCR_64:
1497 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
a0144e2a 1498 break;
4b8473c9
PM		 1499 case KVM_REG_PPC_PPR:
1500 vcpu->arch.ppr = set_reg_val(id, *val);
1501 break;
a7d80d01
MN		 1502#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1503 case KVM_REG_PPC_TFHAR:
1504 vcpu->arch.tfhar = set_reg_val(id, *val);
1505 break;
1506 case KVM_REG_PPC_TFIAR:
1507 vcpu->arch.tfiar = set_reg_val(id, *val);
1508 break;
1509 case KVM_REG_PPC_TEXASR:
1510 vcpu->arch.texasr = set_reg_val(id, *val);
1511 break;
1512 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1513 i = id - KVM_REG_PPC_TM_GPR0;
1514 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
1515 break;
1516 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1517 {
1518 int j;
1519 i = id - KVM_REG_PPC_TM_VSR0;
1520 if (i < 32)
1521 for (j = 0; j < TS_FPRWIDTH; j++)
1522 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
1523 else
1524 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1525 vcpu->arch.vr_tm.vr[i-32] = val->vval;
1526 else
1527 r = -ENXIO;
1528 break;
1529 }
1530 case KVM_REG_PPC_TM_CR:
1531 vcpu->arch.cr_tm = set_reg_val(id, *val);
1532 break;
0d808df0
PM		 1533 case KVM_REG_PPC_TM_XER:
1534 vcpu->arch.xer_tm = set_reg_val(id, *val);
1535 break;
a7d80d01
MN		 1536 case KVM_REG_PPC_TM_LR:
1537 vcpu->arch.lr_tm = set_reg_val(id, *val);
1538 break;
1539 case KVM_REG_PPC_TM_CTR:
1540 vcpu->arch.ctr_tm = set_reg_val(id, *val);
1541 break;
1542 case KVM_REG_PPC_TM_FPSCR:
1543 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
1544 break;
1545 case KVM_REG_PPC_TM_AMR:
1546 vcpu->arch.amr_tm = set_reg_val(id, *val);
1547 break;
1548 case KVM_REG_PPC_TM_PPR:
1549 vcpu->arch.ppr_tm = set_reg_val(id, *val);
1550 break;
1551 case KVM_REG_PPC_TM_VRSAVE:
1552 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
1553 break;
1554 case KVM_REG_PPC_TM_VSCR:
1555 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1556 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
1557 else
1558 r = - ENXIO;
1559 break;
1560 case KVM_REG_PPC_TM_DSCR:
1561 vcpu->arch.dscr_tm = set_reg_val(id, *val);
1562 break;
1563 case KVM_REG_PPC_TM_TAR:
1564 vcpu->arch.tar_tm = set_reg_val(id, *val);
1565 break;
1566#endif
388cc6e1
PM		 1567 case KVM_REG_PPC_ARCH_COMPAT:
1568 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
1569 break;
31f3438e 1570 default:
a136a8bd 1571 r = -EINVAL;
31f3438e
PM		 1572 break;
1573 }
1574
1575 return r;
1576}
1577
45c940ba
PM		 1578/*
1579 * On POWER9, threads are independent and can be in different partitions.
1580 * Therefore we consider each thread to be a subcore.
1581 * There is a restriction that all threads have to be in the same
1582 * MMU mode (radix or HPT), unfortunately, but since we only support
1583 * HPT guests on a HPT host so far, that isn't an impediment yet.
1584 */
1585static int threads_per_vcore(void)
1586{
1587 if (cpu_has_feature(CPU_FTR_ARCH_300))
1588 return 1;
1589 return threads_per_subcore;
1590}
1591
de9bdd1a
SS		 1592static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
1593{
1594 struct kvmppc_vcore *vcore;
1595
1596 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
1597
1598 if (vcore == NULL)
1599 return NULL;
1600
de9bdd1a 1601 spin_lock_init(&vcore->lock);
2711e248 1602 spin_lock_init(&vcore->stoltb_lock);
8577370f 1603 init_swait_queue_head(&vcore->wq);
de9bdd1a
SS		 1604 vcore->preempt_tb = TB_NIL;
1605 vcore->lpcr = kvm->arch.lpcr;
45c940ba 1606 vcore->first_vcpuid = core * threads_per_vcore();
de9bdd1a 1607 vcore->kvm = kvm;
ec257165 1608 INIT_LIST_HEAD(&vcore->preempt_list);
de9bdd1a
SS		 1609
1610 return vcore;
1611}
1612
b6c295df
PM		 1613#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
1614static struct debugfs_timings_element {
1615 const char *name;
1616 size_t offset;
1617} timings[] = {
1618 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
1619 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
1620 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
1621 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
1622 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
1623};
1624
1625#define N_TIMINGS (sizeof(timings) / sizeof(timings[0]))
1626
1627struct debugfs_timings_state {
1628 struct kvm_vcpu *vcpu;
1629 unsigned int buflen;
1630 char buf[N_TIMINGS * 100];
1631};
1632
1633static int debugfs_timings_open(struct inode *inode, struct file *file)
1634{
1635 struct kvm_vcpu *vcpu = inode->i_private;
1636 struct debugfs_timings_state *p;
1637
1638 p = kzalloc(sizeof(*p), GFP_KERNEL);
1639 if (!p)
1640 return -ENOMEM;
1641
1642 kvm_get_kvm(vcpu->kvm);
1643 p->vcpu = vcpu;
1644 file->private_data = p;
1645
1646 return nonseekable_open(inode, file);
1647}
1648
1649static int debugfs_timings_release(struct inode *inode, struct file *file)
1650{
1651 struct debugfs_timings_state *p = file->private_data;
1652
1653 kvm_put_kvm(p->vcpu->kvm);
1654 kfree(p);
1655 return 0;
1656}
1657
1658static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
1659 size_t len, loff_t *ppos)
1660{
1661 struct debugfs_timings_state *p = file->private_data;
1662 struct kvm_vcpu *vcpu = p->vcpu;
1663 char *s, *buf_end;
1664 struct kvmhv_tb_accumulator tb;
1665 u64 count;
1666 loff_t pos;
1667 ssize_t n;
1668 int i, loops;
1669 bool ok;
1670
1671 if (!p->buflen) {
1672 s = p->buf;
1673 buf_end = s + sizeof(p->buf);
1674 for (i = 0; i < N_TIMINGS; ++i) {
1675 struct kvmhv_tb_accumulator *acc;
1676
1677 acc = (struct kvmhv_tb_accumulator *)
1678 ((unsigned long)vcpu + timings[i].offset);
1679 ok = false;
1680 for (loops = 0; loops < 1000; ++loops) {
1681 count = acc->seqcount;
1682 if (!(count & 1)) {
1683 smp_rmb();
1684 tb = *acc;
1685 smp_rmb();
1686 if (count == acc->seqcount) {
1687 ok = true;
1688 break;
1689 }
1690 }
1691 udelay(1);
1692 }
1693 if (!ok)
1694 snprintf(s, buf_end - s, "%s: stuck\n",
1695 timings[i].name);
1696 else
1697 snprintf(s, buf_end - s,
1698 "%s: %llu %llu %llu %llu\n",
1699 timings[i].name, count / 2,
1700 tb_to_ns(tb.tb_total),
1701 tb_to_ns(tb.tb_min),
1702 tb_to_ns(tb.tb_max));
1703 s += strlen(s);
1704 }
1705 p->buflen = s - p->buf;
1706 }
1707
1708 pos = *ppos;
1709 if (pos >= p->buflen)
1710 return 0;
1711 if (len > p->buflen - pos)
1712 len = p->buflen - pos;
1713 n = copy_to_user(buf, p->buf + pos, len);
1714 if (n) {
1715 if (n == len)
1716 return -EFAULT;
1717 len -= n;
1718 }
1719 *ppos = pos + len;
1720 return len;
1721}
1722
1723static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
1724 size_t len, loff_t *ppos)
1725{
1726 return -EACCES;
1727}
1728
1729static const struct file_operations debugfs_timings_ops = {
1730 .owner = THIS_MODULE,
1731 .open = debugfs_timings_open,
1732 .release = debugfs_timings_release,
1733 .read = debugfs_timings_read,
1734 .write = debugfs_timings_write,
1735 .llseek = generic_file_llseek,
1736};
1737
1738/* Create a debugfs directory for the vcpu */
1739static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
1740{
1741 char buf[16];
1742 struct kvm *kvm = vcpu->kvm;
1743
1744 snprintf(buf, sizeof(buf), "vcpu%u", id);
1745 if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
1746 return;
1747 vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
1748 if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
1749 return;
1750 vcpu->arch.debugfs_timings =
1751 debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
1752 vcpu, &debugfs_timings_ops);
1753}
1754
1755#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
1756static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
1757{
1758}
1759#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
1760
3a167bea
AK		 1761static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
1762 unsigned int id)
de56a948
PM		 1763{
1764 struct kvm_vcpu *vcpu;
371fefd6
PM		 1765 int err = -EINVAL;
1766 int core;
1767 struct kvmppc_vcore *vcore;
de56a948 1768
45c940ba 1769 core = id / threads_per_vcore();
371fefd6
PM		 1770 if (core >= KVM_MAX_VCORES)
1771 goto out;
1772
1773 err = -ENOMEM;
6b75e6bf 1774 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
de56a948
PM		 1775 if (!vcpu)
1776 goto out;
1777
1778 err = kvm_vcpu_init(vcpu, kvm, id);
1779 if (err)
1780 goto free_vcpu;
1781
1782 vcpu->arch.shared = &vcpu->arch.shregs;
5deb8e7a
AG		 1783#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1784 /*
1785 * The shared struct is never shared on HV,
1786 * so we can always use host endianness
1787 */
1788#ifdef __BIG_ENDIAN__
1789 vcpu->arch.shared_big_endian = true;
1790#else
1791 vcpu->arch.shared_big_endian = false;
1792#endif
1793#endif
de56a948
PM		 1794 vcpu->arch.mmcr[0] = MMCR0_FC;
1795 vcpu->arch.ctrl = CTRL_RUNLATCH;
1796 /* default to host PVR, since we can't spoof it */
3a167bea 1797 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
2e25aa5f 1798 spin_lock_init(&vcpu->arch.vpa_update_lock);
c7b67670
PM		 1799 spin_lock_init(&vcpu->arch.tbacct_lock);
1800 vcpu->arch.busy_preempt = TB_NIL;
d682916a 1801 vcpu->arch.intr_msr = MSR_SF | MSR_ME;
de56a948 1802
de56a948
PM		 1803 kvmppc_mmu_book3s_hv_init(vcpu);
1804
8455d79e 1805 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
371fefd6
PM		 1806
1807 init_waitqueue_head(&vcpu->arch.cpu_run);
1808
1809 mutex_lock(&kvm->lock);
1810 vcore = kvm->arch.vcores[core];
1811 if (!vcore) {
de9bdd1a 1812 vcore = kvmppc_vcore_create(kvm, core);
371fefd6 1813 kvm->arch.vcores[core] = vcore;
1b400ba0 1814 kvm->arch.online_vcores++;
371fefd6
PM		 1815 }
1816 mutex_unlock(&kvm->lock);
1817
1818 if (!vcore)
1819 goto free_vcpu;
1820
1821 spin_lock(&vcore->lock);
1822 ++vcore->num_threads;
371fefd6
PM		 1823 spin_unlock(&vcore->lock);
1824 vcpu->arch.vcore = vcore;
e0b7ec05 1825 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
ec257165 1826 vcpu->arch.thread_cpu = -1;
a29ebeaf 1827 vcpu->arch.prev_cpu = -1;
371fefd6 1828
af8f38b3
AG		 1829 vcpu->arch.cpu_type = KVM_CPU_3S_64;
1830 kvmppc_sanity_check(vcpu);
1831
b6c295df
PM		 1832 debugfs_vcpu_init(vcpu, id);
1833
de56a948
PM		 1834 return vcpu;
1835
1836free_vcpu:
6b75e6bf 1837 kmem_cache_free(kvm_vcpu_cache, vcpu);
de56a948
PM		 1838out:
1839 return ERR_PTR(err);
1840}
1841
c35635ef
PM		 1842static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
1843{
1844 if (vpa->pinned_addr)
1845 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
1846 vpa->dirty);
1847}
1848
3a167bea 1849static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
de56a948 1850{
2e25aa5f 1851 spin_lock(&vcpu->arch.vpa_update_lock);
c35635ef
PM		 1852 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
1853 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
1854 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
2e25aa5f 1855 spin_unlock(&vcpu->arch.vpa_update_lock);
de56a948 1856 kvm_vcpu_uninit(vcpu);
6b75e6bf 1857 kmem_cache_free(kvm_vcpu_cache, vcpu);
de56a948
PM		 1858}
1859
3a167bea
AK		 1860static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
1861{
1862 /* Indicate we want to get back into the guest */
1863 return 1;
1864}
1865
19ccb76a 1866static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
371fefd6 1867{
19ccb76a 1868 unsigned long dec_nsec, now;
371fefd6 1869
19ccb76a
PM		 1870 now = get_tb();
1871 if (now > vcpu->arch.dec_expires) {
1872 /* decrementer has already gone negative */
1873 kvmppc_core_queue_dec(vcpu);
7e28e60e 1874 kvmppc_core_prepare_to_enter(vcpu);
19ccb76a 1875 return;
371fefd6 1876 }
19ccb76a
PM		 1877 dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
1878 / tb_ticks_per_sec;
8b0e1953 1879 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
19ccb76a 1880 vcpu->arch.timer_running = 1;
371fefd6
PM		 1881}
1882
19ccb76a 1883static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
371fefd6 1884{
19ccb76a
PM		 1885 vcpu->arch.ceded = 0;
1886 if (vcpu->arch.timer_running) {
1887 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1888 vcpu->arch.timer_running = 0;
1889 }
371fefd6
PM		 1890}
1891
e0b7ec05 1892extern void __kvmppc_vcore_entry(void);
de56a948 1893
371fefd6
PM		 1894static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
1895 struct kvm_vcpu *vcpu)
de56a948 1896{
c7b67670
PM		 1897 u64 now;
1898
371fefd6
PM		 1899 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
1900 return;
bf3d32e1 1901 spin_lock_irq(&vcpu->arch.tbacct_lock);
c7b67670
PM		 1902 now = mftb();
1903 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
1904 vcpu->arch.stolen_logged;
1905 vcpu->arch.busy_preempt = now;
1906 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
bf3d32e1 1907 spin_unlock_irq(&vcpu->arch.tbacct_lock);
371fefd6 1908 --vc->n_runnable;
7b5f8272 1909 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
371fefd6
PM		 1910}
1911
f0888f70
PM		 1912static int kvmppc_grab_hwthread(int cpu)
1913{
1914 struct paca_struct *tpaca;
b754c739 1915 long timeout = 10000;
f0888f70
PM		 1916
1917 tpaca = &paca[cpu];
1918
1919 /* Ensure the thread won't go into the kernel if it wakes */
7b444c67 1920 tpaca->kvm_hstate.kvm_vcpu = NULL;
b4deba5c 1921 tpaca->kvm_hstate.kvm_vcore = NULL;
5d5b99cd
PM		 1922 tpaca->kvm_hstate.napping = 0;
1923 smp_wmb();
1924 tpaca->kvm_hstate.hwthread_req = 1;
f0888f70
PM		 1925
1926 /*
1927 * If the thread is already executing in the kernel (e.g. handling
1928 * a stray interrupt), wait for it to get back to nap mode.
1929 * The smp_mb() is to ensure that our setting of hwthread_req
1930 * is visible before we look at hwthread_state, so if this
1931 * races with the code at system_reset_pSeries and the thread
1932 * misses our setting of hwthread_req, we are sure to see its
1933 * setting of hwthread_state, and vice versa.
1934 */
1935 smp_mb();
1936 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
1937 if (--timeout <= 0) {
1938 pr_err("KVM: couldn't grab cpu %d\n", cpu);
1939 return -EBUSY;
1940 }
1941 udelay(1);
1942 }
1943 return 0;
1944}
1945
1946static void kvmppc_release_hwthread(int cpu)
1947{
1948 struct paca_struct *tpaca;
1949
1950 tpaca = &paca[cpu];
1951 tpaca->kvm_hstate.hwthread_req = 0;
1952 tpaca->kvm_hstate.kvm_vcpu = NULL;
b4deba5c
PM		 1953 tpaca->kvm_hstate.kvm_vcore = NULL;
1954 tpaca->kvm_hstate.kvm_split_mode = NULL;
f0888f70
PM		 1955}
1956
a29ebeaf
PM		 1957static void do_nothing(void *x)
1958{
1959}
1960
1961static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
1962{
1963 int i;
1964
1965 cpu = cpu_first_thread_sibling(cpu);
1966 cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
1967 /*
1968 * Make sure setting of bit in need_tlb_flush precedes
1969 * testing of cpu_in_guest bits. The matching barrier on
1970 * the other side is the first smp_mb() in kvmppc_run_core().
1971 */
1972 smp_mb();
1973 for (i = 0; i < threads_per_core; ++i)
1974 if (cpumask_test_cpu(cpu + i, &kvm->arch.cpu_in_guest))
1975 smp_call_function_single(cpu + i, do_nothing, NULL, 1);
1976}
1977
b4deba5c 1978static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
371fefd6
PM		 1979{
1980 int cpu;
1981 struct paca_struct *tpaca;
ec257165 1982 struct kvmppc_vcore *mvc = vc->master_vcore;
a29ebeaf 1983 struct kvm *kvm = vc->kvm;
371fefd6 1984
b4deba5c
PM		 1985 cpu = vc->pcpu;
1986 if (vcpu) {
1987 if (vcpu->arch.timer_running) {
1988 hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
1989 vcpu->arch.timer_running = 0;
1990 }
1991 cpu += vcpu->arch.ptid;
1992 vcpu->cpu = mvc->pcpu;
1993 vcpu->arch.thread_cpu = cpu;
a29ebeaf
PM		 1994
1995 /*
1996 * With radix, the guest can do TLB invalidations itself,
1997 * and it could choose to use the local form (tlbiel) if
1998 * it is invalidating a translation that has only ever been
1999 * used on one vcpu. However, that doesn't mean it has
2000 * only ever been used on one physical cpu, since vcpus
2001 * can move around between pcpus. To cope with this, when
2002 * a vcpu moves from one pcpu to another, we need to tell
2003 * any vcpus running on the same core as this vcpu previously
2004 * ran to flush the TLB. The TLB is shared between threads,
2005 * so we use a single bit in .need_tlb_flush for all 4 threads.
2006 */
2007 if (kvm_is_radix(kvm) && vcpu->arch.prev_cpu != cpu) {
2008 if (vcpu->arch.prev_cpu >= 0 &&
2009 cpu_first_thread_sibling(vcpu->arch.prev_cpu) !=
2010 cpu_first_thread_sibling(cpu))
2011 radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu);
2012 vcpu->arch.prev_cpu = cpu;
2013 }
2014 cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
19ccb76a 2015 }
371fefd6 2016 tpaca = &paca[cpu];
5d5b99cd 2017 tpaca->kvm_hstate.kvm_vcpu = vcpu;
ec257165 2018 tpaca->kvm_hstate.ptid = cpu - mvc->pcpu;
ec257165 2019 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
371fefd6 2020 smp_wmb();
b4deba5c 2021 tpaca->kvm_hstate.kvm_vcore = mvc;
5d5b99cd 2022 if (cpu != smp_processor_id())
66feed61 2023 kvmppc_ipi_thread(cpu);
371fefd6 2024}
de56a948 2025
5d5b99cd 2026static void kvmppc_wait_for_nap(void)
371fefd6 2027{
5d5b99cd
PM		 2028 int cpu = smp_processor_id();
2029 int i, loops;
45c940ba 2030 int n_threads = threads_per_vcore();
371fefd6 2031
45c940ba
PM		 2032 if (n_threads <= 1)
2033 return;
5d5b99cd
PM		 2034 for (loops = 0; loops < 1000000; ++loops) {
2035 /*
2036 * Check if all threads are finished.
b4deba5c 2037 * We set the vcore pointer when starting a thread
5d5b99cd 2038 * and the thread clears it when finished, so we look
b4deba5c 2039 * for any threads that still have a non-NULL vcore ptr.
5d5b99cd 2040 */
45c940ba 2041 for (i = 1; i < n_threads; ++i)
b4deba5c 2042 if (paca[cpu + i].kvm_hstate.kvm_vcore)
5d5b99cd 2043 break;
45c940ba 2044 if (i == n_threads) {
5d5b99cd
PM		 2045 HMT_medium();
2046 return;
371fefd6 2047 }
5d5b99cd 2048 HMT_low();
371fefd6
PM		 2049 }
2050 HMT_medium();
45c940ba 2051 for (i = 1; i < n_threads; ++i)
b4deba5c 2052 if (paca[cpu + i].kvm_hstate.kvm_vcore)
5d5b99cd 2053 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
371fefd6
PM		 2054}
2055
2056/*
2057 * Check that we are on thread 0 and that any other threads in
7b444c67
PM		 2058 * this core are off-line. Then grab the threads so they can't
2059 * enter the kernel.
371fefd6
PM		 2060 */
2061static int on_primary_thread(void)
2062{
2063 int cpu = smp_processor_id();
3102f784 2064 int thr;
371fefd6 2065
3102f784
ME		 2066 /* Are we on a primary subcore? */
2067 if (cpu_thread_in_subcore(cpu))
371fefd6 2068 return 0;
3102f784
ME		 2069
2070 thr = 0;
2071 while (++thr < threads_per_subcore)
371fefd6
PM		 2072 if (cpu_online(cpu + thr))
2073 return 0;
7b444c67
PM		 2074
2075 /* Grab all hw threads so they can't go into the kernel */
3102f784 2076 for (thr = 1; thr < threads_per_subcore; ++thr) {
7b444c67
PM		 2077 if (kvmppc_grab_hwthread(cpu + thr)) {
2078 /* Couldn't grab one; let the others go */
2079 do {
2080 kvmppc_release_hwthread(cpu + thr);
2081 } while (--thr > 0);
2082 return 0;
2083 }
2084 }
371fefd6
PM		 2085 return 1;
2086}
2087
ec257165
PM		 2088/*
2089 * A list of virtual cores for each physical CPU.
2090 * These are vcores that could run but their runner VCPU tasks are
2091 * (or may be) preempted.
2092 */
2093struct preempted_vcore_list {
2094 struct list_head list;
2095 spinlock_t lock;
2096};
2097
2098static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
2099
2100static void init_vcore_lists(void)
2101{
2102 int cpu;
2103
2104 for_each_possible_cpu(cpu) {
2105 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
2106 spin_lock_init(&lp->lock);
2107 INIT_LIST_HEAD(&lp->list);
2108 }
2109}
2110
2111static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
2112{
2113 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2114
2115 vc->vcore_state = VCORE_PREEMPT;
2116 vc->pcpu = smp_processor_id();
45c940ba 2117 if (vc->num_threads < threads_per_vcore()) {
ec257165
PM		 2118 spin_lock(&lp->lock);
2119 list_add_tail(&vc->preempt_list, &lp->list);
2120 spin_unlock(&lp->lock);
2121 }
2122
2123 /* Start accumulating stolen time */
2124 kvmppc_core_start_stolen(vc);
2125}
2126
2127static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
2128{
402813fe 2129 struct preempted_vcore_list *lp;
ec257165
PM		 2130
2131 kvmppc_core_end_stolen(vc);
2132 if (!list_empty(&vc->preempt_list)) {
402813fe 2133 lp = &per_cpu(preempted_vcores, vc->pcpu);
ec257165
PM		 2134 spin_lock(&lp->lock);
2135 list_del_init(&vc->preempt_list);
2136 spin_unlock(&lp->lock);
2137 }
2138 vc->vcore_state = VCORE_INACTIVE;
2139}
2140
b4deba5c
PM		 2141/*
2142 * This stores information about the virtual cores currently
2143 * assigned to a physical core.
2144 */
ec257165 2145struct core_info {
b4deba5c
PM		 2146 int n_subcores;
2147 int max_subcore_threads;
ec257165 2148 int total_threads;
b4deba5c
PM		 2149 int subcore_threads[MAX_SUBCORES];
2150 struct kvm *subcore_vm[MAX_SUBCORES];
2151 struct list_head vcs[MAX_SUBCORES];
ec257165
PM		 2152};
2153
b4deba5c
PM		 2154/*
2155 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
2156 * respectively in 2-way micro-threading (split-core) mode.
2157 */
2158static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
2159
ec257165
PM		 2160static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
2161{
b4deba5c
PM		 2162 int sub;
2163
ec257165 2164 memset(cip, 0, sizeof(*cip));
b4deba5c
PM		 2165 cip->n_subcores = 1;
2166 cip->max_subcore_threads = vc->num_threads;
ec257165 2167 cip->total_threads = vc->num_threads;
b4deba5c
PM		 2168 cip->subcore_threads[0] = vc->num_threads;
2169 cip->subcore_vm[0] = vc->kvm;
2170 for (sub = 0; sub < MAX_SUBCORES; ++sub)
2171 INIT_LIST_HEAD(&cip->vcs[sub]);
2172 list_add_tail(&vc->preempt_list, &cip->vcs[0]);
2173}
2174
2175static bool subcore_config_ok(int n_subcores, int n_threads)
2176{
2177 /* Can only dynamically split if unsplit to begin with */
2178 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
2179 return false;
2180 if (n_subcores > MAX_SUBCORES)
2181 return false;
2182 if (n_subcores > 1) {
2183 if (!(dynamic_mt_modes & 2))
2184 n_subcores = 4;
2185 if (n_subcores > 2 && !(dynamic_mt_modes & 4))
2186 return false;
2187 }
2188
2189 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
ec257165
PM		 2190}
2191
2192static void init_master_vcore(struct kvmppc_vcore *vc)
2193{
2194 vc->master_vcore = vc;
2195 vc->entry_exit_map = 0;
2196 vc->in_guest = 0;
2197 vc->napping_threads = 0;
2198 vc->conferring_threads = 0;
2199}
2200
b4deba5c
PM		 2201static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
2202{
2203 int n_threads = vc->num_threads;
2204 int sub;
2205
2206 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
2207 return false;
2208
2209 if (n_threads < cip->max_subcore_threads)
2210 n_threads = cip->max_subcore_threads;
b009031f 2211 if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
b4deba5c 2212 return false;
b009031f 2213 cip->max_subcore_threads = n_threads;
b4deba5c
PM		 2214
2215 sub = cip->n_subcores;
2216 ++cip->n_subcores;
2217 cip->total_threads += vc->num_threads;
2218 cip->subcore_threads[sub] = vc->num_threads;
2219 cip->subcore_vm[sub] = vc->kvm;
2220 init_master_vcore(vc);
28d057c8 2221 list_move_tail(&vc->preempt_list, &cip->vcs[sub]);
b4deba5c
PM		 2222
2223 return true;
2224}
2225
b4deba5c
PM		 2226/*
2227 * Work out whether it is possible to piggyback the execution of
2228 * vcore *pvc onto the execution of the other vcores described in *cip.
2229 */
2230static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
2231 int target_threads)
2232{
b4deba5c
PM		 2233 if (cip->total_threads + pvc->num_threads > target_threads)
2234 return false;
b4deba5c 2235
b009031f 2236 return can_dynamic_split(pvc, cip);
b4deba5c
PM		 2237}
2238
d911f0be
PM		 2239static void prepare_threads(struct kvmppc_vcore *vc)
2240{
7b5f8272
SJS		 2241 int i;
2242 struct kvm_vcpu *vcpu;
d911f0be 2243
7b5f8272 2244 for_each_runnable_thread(i, vcpu, vc) {
d911f0be
PM		 2245 if (signal_pending(vcpu->arch.run_task))
2246 vcpu->arch.ret = -EINTR;
2247 else if (vcpu->arch.vpa.update_pending ||
2248 vcpu->arch.slb_shadow.update_pending ||
2249 vcpu->arch.dtl.update_pending)
2250 vcpu->arch.ret = RESUME_GUEST;
2251 else
2252 continue;
2253 kvmppc_remove_runnable(vc, vcpu);
2254 wake_up(&vcpu->arch.cpu_run);
2255 }
2256}
2257
ec257165
PM		 2258static void collect_piggybacks(struct core_info *cip, int target_threads)
2259{
2260 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
2261 struct kvmppc_vcore *pvc, *vcnext;
2262
2263 spin_lock(&lp->lock);
2264 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
2265 if (!spin_trylock(&pvc->lock))
2266 continue;
2267 prepare_threads(pvc);
2268 if (!pvc->n_runnable) {
2269 list_del_init(&pvc->preempt_list);
2270 if (pvc->runner == NULL) {
2271 pvc->vcore_state = VCORE_INACTIVE;
2272 kvmppc_core_end_stolen(pvc);
2273 }
2274 spin_unlock(&pvc->lock);
2275 continue;
2276 }
2277 if (!can_piggyback(pvc, cip, target_threads)) {
2278 spin_unlock(&pvc->lock);
2279 continue;
2280 }
2281 kvmppc_core_end_stolen(pvc);
2282 pvc->vcore_state = VCORE_PIGGYBACK;
2283 if (cip->total_threads >= target_threads)
2284 break;
2285 }
2286 spin_unlock(&lp->lock);
2287}
2288
2289static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
25fedfca 2290{
7b5f8272 2291 int still_running = 0, i;
25fedfca
PM		 2292 u64 now;
2293 long ret;
7b5f8272 2294 struct kvm_vcpu *vcpu;
25fedfca 2295
ec257165 2296 spin_lock(&vc->lock);
25fedfca 2297 now = get_tb();
7b5f8272 2298 for_each_runnable_thread(i, vcpu, vc) {
25fedfca
PM		 2299 /* cancel pending dec exception if dec is positive */
2300 if (now < vcpu->arch.dec_expires &&
2301 kvmppc_core_pending_dec(vcpu))
2302 kvmppc_core_dequeue_dec(vcpu);
2303
2304 trace_kvm_guest_exit(vcpu);
2305
2306 ret = RESUME_GUEST;
2307 if (vcpu->arch.trap)
2308 ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
2309 vcpu->arch.run_task);
2310
2311 vcpu->arch.ret = ret;
2312 vcpu->arch.trap = 0;
2313
ec257165
PM		 2314 if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
2315 if (vcpu->arch.pending_exceptions)
2316 kvmppc_core_prepare_to_enter(vcpu);
2317 if (vcpu->arch.ceded)
25fedfca 2318 kvmppc_set_timer(vcpu);
ec257165
PM		 2319 else
2320 ++still_running;
2321 } else {
25fedfca
PM		 2322 kvmppc_remove_runnable(vc, vcpu);
2323 wake_up(&vcpu->arch.cpu_run);
2324 }
2325 }
ec257165
PM		 2326 list_del_init(&vc->preempt_list);
2327 if (!is_master) {
563a1e93 2328 if (still_running > 0) {
ec257165 2329 kvmppc_vcore_preempt(vc);
563a1e93
PM		 2330 } else if (vc->runner) {
2331 vc->vcore_state = VCORE_PREEMPT;
2332 kvmppc_core_start_stolen(vc);
2333 } else {
2334 vc->vcore_state = VCORE_INACTIVE;
2335 }
ec257165
PM		 2336 if (vc->n_runnable > 0 && vc->runner == NULL) {
2337 /* make sure there's a candidate runner awake */
7b5f8272
SJS		 2338 i = -1;
2339 vcpu = next_runnable_thread(vc, &i);
ec257165
PM		 2340 wake_up(&vcpu->arch.cpu_run);
2341 }
2342 }
2343 spin_unlock(&vc->lock);
25fedfca
PM		 2344}
2345
b8e6a87c
SW		 2346/*
2347 * Clear core from the list of active host cores as we are about to
2348 * enter the guest. Only do this if it is the primary thread of the
2349 * core (not if a subcore) that is entering the guest.
2350 */
3f7cd919 2351static inline int kvmppc_clear_host_core(unsigned int cpu)
b8e6a87c
SW		 2352{
2353 int core;
2354
2355 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
3f7cd919 2356 return 0;
b8e6a87c
SW		 2357 /*
2358 * Memory barrier can be omitted here as we will do a smp_wmb()
2359 * later in kvmppc_start_thread and we need ensure that state is
2360 * visible to other CPUs only after we enter guest.
2361 */
2362 core = cpu >> threads_shift;
2363 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
3f7cd919 2364 return 0;
b8e6a87c
SW		 2365}
2366
2367/*
2368 * Advertise this core as an active host core since we exited the guest
2369 * Only need to do this if it is the primary thread of the core that is
2370 * exiting.
2371 */
3f7cd919 2372static inline int kvmppc_set_host_core(unsigned int cpu)
b8e6a87c
SW		 2373{
2374 int core;
2375
2376 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
3f7cd919 2377 return 0;
b8e6a87c
SW		 2378
2379 /*
2380 * Memory barrier can be omitted here because we do a spin_unlock
2381 * immediately after this which provides the memory barrier.
2382 */
2383 core = cpu >> threads_shift;
2384 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
3f7cd919 2385 return 0;
b8e6a87c
SW		 2386}
2387
371fefd6
PM		 2388/*
2389 * Run a set of guest threads on a physical core.
2390 * Called with vc->lock held.
2391 */
66feed61 2392static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
371fefd6 2393{
7b5f8272 2394 struct kvm_vcpu *vcpu;
d911f0be 2395 int i;
2c9097e4 2396 int srcu_idx;
ec257165
PM		 2397 struct core_info core_info;
2398 struct kvmppc_vcore *pvc, *vcnext;
b4deba5c
PM		 2399 struct kvm_split_mode split_info, *sip;
2400 int split, subcore_size, active;
2401 int sub;
2402 bool thr0_done;
2403 unsigned long cmd_bit, stat_bit;
ec257165
PM		 2404 int pcpu, thr;
2405 int target_threads;
45c940ba 2406 int controlled_threads;
371fefd6 2407
d911f0be
PM		 2408 /*
2409 * Remove from the list any threads that have a signal pending
2410 * or need a VPA update done
2411 */
2412 prepare_threads(vc);
2413
2414 /* if the runner is no longer runnable, let the caller pick a new one */
2415 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
2416 return;
081f323b
PM		 2417
2418 /*
d911f0be 2419 * Initialize *vc.
081f323b 2420 */
ec257165 2421 init_master_vcore(vc);
2711e248 2422 vc->preempt_tb = TB_NIL;
081f323b 2423
45c940ba
PM		 2424 /*
2425 * Number of threads that we will be controlling: the same as
2426 * the number of threads per subcore, except on POWER9,
2427 * where it's 1 because the threads are (mostly) independent.
2428 */
2429 controlled_threads = threads_per_vcore();
2430
7b444c67 2431 /*
3102f784
ME		 2432 * Make sure we are running on primary threads, and that secondary
2433 * threads are offline. Also check if the number of threads in this
2434 * guest are greater than the current system threads per guest.
7b444c67 2435 */
45c940ba 2436 if ((controlled_threads > 1) &&
3102f784 2437 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
7b5f8272 2438 for_each_runnable_thread(i, vcpu, vc) {
7b444c67 2439 vcpu->arch.ret = -EBUSY;
25fedfca
PM		 2440 kvmppc_remove_runnable(vc, vcpu);
2441 wake_up(&vcpu->arch.cpu_run);
2442 }
7b444c67
PM		 2443 goto out;
2444 }
2445
ec257165
PM		 2446 /*
2447 * See if we could run any other vcores on the physical core
2448 * along with this one.
2449 */
2450 init_core_info(&core_info, vc);
2451 pcpu = smp_processor_id();
45c940ba 2452 target_threads = controlled_threads;
ec257165
PM		 2453 if (target_smt_mode && target_smt_mode < target_threads)
2454 target_threads = target_smt_mode;
2455 if (vc->num_threads < target_threads)
2456 collect_piggybacks(&core_info, target_threads);
3102f784 2457
b4deba5c
PM		 2458 /* Decide on micro-threading (split-core) mode */
2459 subcore_size = threads_per_subcore;
2460 cmd_bit = stat_bit = 0;
2461 split = core_info.n_subcores;
2462 sip = NULL;
2463 if (split > 1) {
2464 /* threads_per_subcore must be MAX_SMT_THREADS (8) here */
2465 if (split == 2 && (dynamic_mt_modes & 2)) {
2466 cmd_bit = HID0_POWER8_1TO2LPAR;
2467 stat_bit = HID0_POWER8_2LPARMODE;
2468 } else {
2469 split = 4;
2470 cmd_bit = HID0_POWER8_1TO4LPAR;
2471 stat_bit = HID0_POWER8_4LPARMODE;
2472 }
2473 subcore_size = MAX_SMT_THREADS / split;
2474 sip = &split_info;
2475 memset(&split_info, 0, sizeof(split_info));
2476 split_info.rpr = mfspr(SPRN_RPR);
2477 split_info.pmmar = mfspr(SPRN_PMMAR);
2478 split_info.ldbar = mfspr(SPRN_LDBAR);
2479 split_info.subcore_size = subcore_size;
2480 for (sub = 0; sub < core_info.n_subcores; ++sub)
2481 split_info.master_vcs[sub] =
2482 list_first_entry(&core_info.vcs[sub],
2483 struct kvmppc_vcore, preempt_list);
2484 /* order writes to split_info before kvm_split_mode pointer */
2485 smp_wmb();
2486 }
2487 pcpu = smp_processor_id();
45c940ba 2488 for (thr = 0; thr < controlled_threads; ++thr)
b4deba5c
PM		 2489 paca[pcpu + thr].kvm_hstate.kvm_split_mode = sip;
2490
2491 /* Initiate micro-threading (split-core) if required */
2492 if (cmd_bit) {
2493 unsigned long hid0 = mfspr(SPRN_HID0);
2494
2495 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
2496 mb();
2497 mtspr(SPRN_HID0, hid0);
2498 isync();
2499 for (;;) {
2500 hid0 = mfspr(SPRN_HID0);
2501 if (hid0 & stat_bit)
2502 break;
2503 cpu_relax();
ec257165 2504 }
2e25aa5f 2505 }
3102f784 2506
b8e6a87c
SW		 2507 kvmppc_clear_host_core(pcpu);
2508
b4deba5c
PM		 2509 /* Start all the threads */
2510 active = 0;
2511 for (sub = 0; sub < core_info.n_subcores; ++sub) {
2512 thr = subcore_thread_map[sub];
2513 thr0_done = false;
2514 active |= 1 << thr;
2515 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list) {
2516 pvc->pcpu = pcpu + thr;
7b5f8272 2517 for_each_runnable_thread(i, vcpu, pvc) {
b4deba5c
PM		 2518 kvmppc_start_thread(vcpu, pvc);
2519 kvmppc_create_dtl_entry(vcpu, pvc);
2520 trace_kvm_guest_enter(vcpu);
2521 if (!vcpu->arch.ptid)
2522 thr0_done = true;
2523 active |= 1 << (thr + vcpu->arch.ptid);
2524 }
2525 /*
2526 * We need to start the first thread of each subcore
2527 * even if it doesn't have a vcpu.
2528 */
2529 if (pvc->master_vcore == pvc && !thr0_done)
2530 kvmppc_start_thread(NULL, pvc);
2531 thr += pvc->num_threads;
2532 }
2e25aa5f 2533 }
371fefd6 2534
7f235328
GS		 2535 /*
2536 * Ensure that split_info.do_nap is set after setting
2537 * the vcore pointer in the PACA of the secondaries.
2538 */
2539 smp_mb();
2540 if (cmd_bit)
2541 split_info.do_nap = 1; /* ask secondaries to nap when done */
2542
b4deba5c
PM		 2543 /*
2544 * When doing micro-threading, poke the inactive threads as well.
2545 * This gets them to the nap instruction after kvm_do_nap,
2546 * which reduces the time taken to unsplit later.
2547 */
2548 if (split > 1)
2549 for (thr = 1; thr < threads_per_subcore; ++thr)
2550 if (!(active & (1 << thr)))
2551 kvmppc_ipi_thread(pcpu + thr);
e0b7ec05 2552
2f12f034 2553 vc->vcore_state = VCORE_RUNNING;
19ccb76a 2554 preempt_disable();
3c78f78a
SW		 2555
2556 trace_kvmppc_run_core(vc, 0);
2557
b4deba5c
PM		 2558 for (sub = 0; sub < core_info.n_subcores; ++sub)
2559 list_for_each_entry(pvc, &core_info.vcs[sub], preempt_list)
2560 spin_unlock(&pvc->lock);
de56a948 2561
6edaa530 2562 guest_enter();
2c9097e4 2563
e0b7ec05 2564 srcu_idx = srcu_read_lock(&vc->kvm->srcu);
2c9097e4 2565
e0b7ec05 2566 __kvmppc_vcore_entry();
de56a948 2567
ec257165
PM		 2568 srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
2569
2570 spin_lock(&vc->lock);
371fefd6 2571 /* prevent other vcpu threads from doing kvmppc_start_thread() now */
19ccb76a 2572 vc->vcore_state = VCORE_EXITING;
371fefd6 2573
19ccb76a 2574 /* wait for secondary threads to finish writing their state to memory */
5d5b99cd 2575 kvmppc_wait_for_nap();
b4deba5c
PM		 2576
2577 /* Return to whole-core mode if we split the core earlier */
2578 if (split > 1) {
2579 unsigned long hid0 = mfspr(SPRN_HID0);
2580 unsigned long loops = 0;
2581
2582 hid0 &= ~HID0_POWER8_DYNLPARDIS;
2583 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
2584 mb();
2585 mtspr(SPRN_HID0, hid0);
2586 isync();
2587 for (;;) {
2588 hid0 = mfspr(SPRN_HID0);
2589 if (!(hid0 & stat_bit))
2590 break;
2591 cpu_relax();
2592 ++loops;
2593 }
2594 split_info.do_nap = 0;
2595 }
2596
2597 /* Let secondaries go back to the offline loop */
45c940ba 2598 for (i = 0; i < controlled_threads; ++i) {
b4deba5c
PM		 2599 kvmppc_release_hwthread(pcpu + i);
2600 if (sip && sip->napped[i])
2601 kvmppc_ipi_thread(pcpu + i);
a29ebeaf 2602 cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
b4deba5c
PM		 2603 }
2604
b8e6a87c
SW		 2605 kvmppc_set_host_core(pcpu);
2606
371fefd6 2607 spin_unlock(&vc->lock);
2c9097e4 2608
371fefd6
PM		 2609 /* make sure updates to secondary vcpu structs are visible now */
2610 smp_mb();
6edaa530 2611 guest_exit();
de56a948 2612
b4deba5c
PM		 2613 for (sub = 0; sub < core_info.n_subcores; ++sub)
2614 list_for_each_entry_safe(pvc, vcnext, &core_info.vcs[sub],
2615 preempt_list)
2616 post_guest_process(pvc, pvc == vc);
de56a948 2617
913d3ff9 2618 spin_lock(&vc->lock);
ec257165 2619 preempt_enable();
de56a948
PM		 2620
2621 out:
19ccb76a 2622 vc->vcore_state = VCORE_INACTIVE;
3c78f78a 2623 trace_kvmppc_run_core(vc, 1);
371fefd6
PM		 2624}
2625
19ccb76a
PM		 2626/*
2627 * Wait for some other vcpu thread to execute us, and
2628 * wake us up when we need to handle something in the host.
2629 */
ec257165
PM		 2630static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
2631 struct kvm_vcpu *vcpu, int wait_state)
371fefd6 2632{
371fefd6
PM		 2633 DEFINE_WAIT(wait);
2634
19ccb76a 2635 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
ec257165
PM		 2636 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
2637 spin_unlock(&vc->lock);
19ccb76a 2638 schedule();
ec257165
PM		 2639 spin_lock(&vc->lock);
2640 }
19ccb76a
PM		 2641 finish_wait(&vcpu->arch.cpu_run, &wait);
2642}
2643
0cda69dd
SJS		 2644static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
2645{
2646 /* 10us base */
2647 if (vc->halt_poll_ns == 0 && halt_poll_ns_grow)
2648 vc->halt_poll_ns = 10000;
2649 else
2650 vc->halt_poll_ns *= halt_poll_ns_grow;
0cda69dd
SJS		 2651}
2652
2653static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
2654{
2655 if (halt_poll_ns_shrink == 0)
2656 vc->halt_poll_ns = 0;
2657 else
2658 vc->halt_poll_ns /= halt_poll_ns_shrink;
2659}
2660
908a0935
SJS		 2661/*
2662 * Check to see if any of the runnable vcpus on the vcore have pending
0cda69dd
SJS		 2663 * exceptions or are no longer ceded
2664 */
2665static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
2666{
2667 struct kvm_vcpu *vcpu;
2668 int i;
2669
2670 for_each_runnable_thread(i, vcpu, vc) {
8464c884
PM		 2671 if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded ||
2672 vcpu->arch.prodded)
0cda69dd
SJS		 2673 return 1;
2674 }
2675
2676 return 0;
2677}
2678
19ccb76a
PM		 2679/*
2680 * All the vcpus in this vcore are idle, so wait for a decrementer
2681 * or external interrupt to one of the vcpus. vc->lock is held.
2682 */
2683static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
2684{
2a27f514 2685 ktime_t cur, start_poll, start_wait;
0cda69dd 2686 int do_sleep = 1;
0cda69dd 2687 u64 block_ns;
8577370f 2688 DECLARE_SWAITQUEUE(wait);
1bc5d59c 2689
0cda69dd 2690 /* Poll for pending exceptions and ceded state */
2a27f514 2691 cur = start_poll = ktime_get();
0cda69dd 2692 if (vc->halt_poll_ns) {
2a27f514
SJS		 2693 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
2694 ++vc->runner->stat.halt_attempted_poll;
1bc5d59c 2695
0cda69dd
SJS		 2696 vc->vcore_state = VCORE_POLLING;
2697 spin_unlock(&vc->lock);
2698
2699 do {
2700 if (kvmppc_vcore_check_block(vc)) {
2701 do_sleep = 0;
2702 break;
2703 }
2704 cur = ktime_get();
2705 } while (single_task_running() && ktime_before(cur, stop));
2706
2707 spin_lock(&vc->lock);
2708 vc->vcore_state = VCORE_INACTIVE;
2709
2a27f514
SJS		 2710 if (!do_sleep) {
2711 ++vc->runner->stat.halt_successful_poll;
0cda69dd 2712 goto out;
2a27f514 2713 }
1bc5d59c
SW		 2714 }
2715
0cda69dd
SJS		 2716 prepare_to_swait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
2717
2718 if (kvmppc_vcore_check_block(vc)) {
8577370f 2719 finish_swait(&vc->wq, &wait);
0cda69dd 2720 do_sleep = 0;
2a27f514
SJS		 2721 /* If we polled, count this as a successful poll */
2722 if (vc->halt_poll_ns)
2723 ++vc->runner->stat.halt_successful_poll;
0cda69dd 2724 goto out;
1bc5d59c
SW		 2725 }
2726
2a27f514
SJS		 2727 start_wait = ktime_get();
2728
19ccb76a 2729 vc->vcore_state = VCORE_SLEEPING;
3c78f78a 2730 trace_kvmppc_vcore_blocked(vc, 0);
19ccb76a 2731 spin_unlock(&vc->lock);
913d3ff9 2732 schedule();
8577370f 2733 finish_swait(&vc->wq, &wait);
19ccb76a
PM		 2734 spin_lock(&vc->lock);
2735 vc->vcore_state = VCORE_INACTIVE;
3c78f78a 2736 trace_kvmppc_vcore_blocked(vc, 1);
2a27f514 2737 ++vc->runner->stat.halt_successful_wait;
0cda69dd
SJS		 2738
2739 cur = ktime_get();
2740
2741out:
2a27f514
SJS		 2742 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
2743
2744 /* Attribute wait time */
2745 if (do_sleep) {
2746 vc->runner->stat.halt_wait_ns +=
2747 ktime_to_ns(cur) - ktime_to_ns(start_wait);
2748 /* Attribute failed poll time */
2749 if (vc->halt_poll_ns)
2750 vc->runner->stat.halt_poll_fail_ns +=
2751 ktime_to_ns(start_wait) -
2752 ktime_to_ns(start_poll);
2753 } else {
2754 /* Attribute successful poll time */
2755 if (vc->halt_poll_ns)
2756 vc->runner->stat.halt_poll_success_ns +=
2757 ktime_to_ns(cur) -
2758 ktime_to_ns(start_poll);
2759 }
0cda69dd
SJS		 2760
2761 /* Adjust poll time */
307d93e4 2762 if (halt_poll_ns) {
0cda69dd
SJS		 2763 if (block_ns <= vc->halt_poll_ns)
2764 ;
2765 /* We slept and blocked for longer than the max halt time */
307d93e4 2766 else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
0cda69dd
SJS		 2767 shrink_halt_poll_ns(vc);
2768 /* We slept and our poll time is too small */
307d93e4
SJS		 2769 else if (vc->halt_poll_ns < halt_poll_ns &&
2770 block_ns < halt_poll_ns)
0cda69dd 2771 grow_halt_poll_ns(vc);
e03f3921
SJS		 2772 if (vc->halt_poll_ns > halt_poll_ns)
2773 vc->halt_poll_ns = halt_poll_ns;
0cda69dd
SJS		 2774 } else
2775 vc->halt_poll_ns = 0;
2776
2777 trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
19ccb76a 2778}
371fefd6 2779
19ccb76a
PM		 2780static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
2781{
7b5f8272 2782 int n_ceded, i;
19ccb76a 2783 struct kvmppc_vcore *vc;
7b5f8272 2784 struct kvm_vcpu *v;
9e368f29 2785
3c78f78a
SW		 2786 trace_kvmppc_run_vcpu_enter(vcpu);
2787
371fefd6
PM		 2788 kvm_run->exit_reason = 0;
2789 vcpu->arch.ret = RESUME_GUEST;
2790 vcpu->arch.trap = 0;
2f12f034 2791 kvmppc_update_vpas(vcpu);
371fefd6 2792
371fefd6
PM		 2793 /*
2794 * Synchronize with other threads in this virtual core
2795 */
2796 vc = vcpu->arch.vcore;
2797 spin_lock(&vc->lock);
19ccb76a 2798 vcpu->arch.ceded = 0;
371fefd6
PM		 2799 vcpu->arch.run_task = current;
2800 vcpu->arch.kvm_run = kvm_run;
c7b67670 2801 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
19ccb76a 2802 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
c7b67670 2803 vcpu->arch.busy_preempt = TB_NIL;
7b5f8272 2804 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
371fefd6
PM		 2805 ++vc->n_runnable;
2806
19ccb76a
PM		 2807 /*
2808 * This happens the first time this is called for a vcpu.
2809 * If the vcore is already running, we may be able to start
2810 * this thread straight away and have it join in.
2811 */
8455d79e 2812 if (!signal_pending(current)) {
ec257165
PM		 2813 if (vc->vcore_state == VCORE_PIGGYBACK) {
2814 struct kvmppc_vcore *mvc = vc->master_vcore;
2815 if (spin_trylock(&mvc->lock)) {
2816 if (mvc->vcore_state == VCORE_RUNNING &&
2817 !VCORE_IS_EXITING(mvc)) {
2818 kvmppc_create_dtl_entry(vcpu, vc);
b4deba5c 2819 kvmppc_start_thread(vcpu, vc);
ec257165
PM		 2820 trace_kvm_guest_enter(vcpu);
2821 }
2822 spin_unlock(&mvc->lock);
2823 }
2824 } else if (vc->vcore_state == VCORE_RUNNING &&
2825 !VCORE_IS_EXITING(vc)) {
2f12f034 2826 kvmppc_create_dtl_entry(vcpu, vc);
b4deba5c 2827 kvmppc_start_thread(vcpu, vc);
3c78f78a 2828 trace_kvm_guest_enter(vcpu);
8455d79e 2829 } else if (vc->vcore_state == VCORE_SLEEPING) {
8577370f 2830 swake_up(&vc->wq);
371fefd6
PM		 2831 }
2832
8455d79e 2833 }
371fefd6 2834
19ccb76a
PM		 2835 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
2836 !signal_pending(current)) {
ec257165
PM		 2837 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
2838 kvmppc_vcore_end_preempt(vc);
2839
8455d79e 2840 if (vc->vcore_state != VCORE_INACTIVE) {
ec257165 2841 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
19ccb76a
PM		 2842 continue;
2843 }
7b5f8272 2844 for_each_runnable_thread(i, v, vc) {
7e28e60e 2845 kvmppc_core_prepare_to_enter(v);
19ccb76a
PM		 2846 if (signal_pending(v->arch.run_task)) {
2847 kvmppc_remove_runnable(vc, v);
2848 v->stat.signal_exits++;
2849 v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
2850 v->arch.ret = -EINTR;
2851 wake_up(&v->arch.cpu_run);
2852 }
2853 }
8455d79e
PM		 2854 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
2855 break;
8455d79e 2856 n_ceded = 0;
7b5f8272 2857 for_each_runnable_thread(i, v, vc) {
8464c884 2858 if (!v->arch.pending_exceptions && !v->arch.prodded)
8455d79e 2859 n_ceded += v->arch.ceded;
4619ac88
PM		 2860 else
2861 v->arch.ceded = 0;
2862 }
25fedfca
PM		 2863 vc->runner = vcpu;
2864 if (n_ceded == vc->n_runnable) {
8455d79e 2865 kvmppc_vcore_blocked(vc);
c56dadf3 2866 } else if (need_resched()) {
ec257165 2867 kvmppc_vcore_preempt(vc);
25fedfca
PM		 2868 /* Let something else run */
2869 cond_resched_lock(&vc->lock);
ec257165
PM		 2870 if (vc->vcore_state == VCORE_PREEMPT)
2871 kvmppc_vcore_end_preempt(vc);
25fedfca 2872 } else {
8455d79e 2873 kvmppc_run_core(vc);
25fedfca 2874 }
0456ec4f 2875 vc->runner = NULL;
19ccb76a 2876 }
371fefd6 2877
8455d79e
PM		 2878 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
2879 (vc->vcore_state == VCORE_RUNNING ||
5fc3e64f
PM		 2880 vc->vcore_state == VCORE_EXITING ||
2881 vc->vcore_state == VCORE_PIGGYBACK))
ec257165 2882 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
8455d79e 2883
5fc3e64f
PM		 2884 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
2885 kvmppc_vcore_end_preempt(vc);
2886
8455d79e
PM		 2887 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
2888 kvmppc_remove_runnable(vc, vcpu);
2889 vcpu->stat.signal_exits++;
2890 kvm_run->exit_reason = KVM_EXIT_INTR;
2891 vcpu->arch.ret = -EINTR;
2892 }
2893
2894 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
2895 /* Wake up some vcpu to run the core */
7b5f8272
SJS		 2896 i = -1;
2897 v = next_runnable_thread(vc, &i);
8455d79e 2898 wake_up(&v->arch.cpu_run);
371fefd6
PM		 2899 }
2900
3c78f78a 2901 trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
371fefd6 2902 spin_unlock(&vc->lock);
371fefd6 2903 return vcpu->arch.ret;
de56a948
PM		 2904}
2905
3a167bea 2906static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
a8606e20
PM		 2907{
2908 int r;
913d3ff9 2909 int srcu_idx;
ca8efa1d 2910 unsigned long ebb_regs[3] = {}; /* shut up GCC */
4c3bb4cc
PM		 2911 unsigned long user_tar = 0;
2912 unsigned int user_vrsave;
a8606e20 2913
af8f38b3
AG		 2914 if (!vcpu->arch.sane) {
2915 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
2916 return -EINVAL;
2917 }
2918
46a704f8
PM		 2919 /*
2920 * Don't allow entry with a suspended transaction, because
2921 * the guest entry/exit code will lose it.
2922 * If the guest has TM enabled, save away their TM-related SPRs
2923 * (they will get restored by the TM unavailable interrupt).
2924 */
2925#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2926 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
2927 (current->thread.regs->msr & MSR_TM)) {
2928 if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
2929 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
2930 run->fail_entry.hardware_entry_failure_reason = 0;
2931 return -EINVAL;
2932 }
2933 current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
2934 current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
2935 current->thread.tm_texasr = mfspr(SPRN_TEXASR);
2936 current->thread.regs->msr &= ~MSR_TM;
2937 }
2938#endif
2939
25051b5a
SW		 2940 kvmppc_core_prepare_to_enter(vcpu);
2941
19ccb76a
PM		 2942 /* No need to go into the guest when all we'll do is come back out */
2943 if (signal_pending(current)) {
2944 run->exit_reason = KVM_EXIT_INTR;
2945 return -EINTR;
2946 }
2947
32fad281 2948 atomic_inc(&vcpu->kvm->arch.vcpus_running);
31037eca 2949 /* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */
32fad281
PM		 2950 smp_mb();
2951
c17b98cf 2952 /* On the first time here, set up HTAB and VRMA */
8cf4ecc0 2953 if (!kvm_is_radix(vcpu->kvm) && !vcpu->kvm->arch.hpte_setup_done) {
32fad281 2954 r = kvmppc_hv_setup_htab_rma(vcpu);
c77162de 2955 if (r)
32fad281 2956 goto out;
c77162de 2957 }
19ccb76a 2958
579e633e
AB		 2959 flush_all_to_thread(current);
2960
4c3bb4cc 2961 /* Save userspace EBB and other register values */
ca8efa1d
PM		 2962 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
2963 ebb_regs[0] = mfspr(SPRN_EBBHR);
2964 ebb_regs[1] = mfspr(SPRN_EBBRR);
2965 ebb_regs[2] = mfspr(SPRN_BESCR);
4c3bb4cc 2966 user_tar = mfspr(SPRN_TAR);
ca8efa1d 2967 }
4c3bb4cc 2968 user_vrsave = mfspr(SPRN_VRSAVE);
ca8efa1d 2969
19ccb76a 2970 vcpu->arch.wqp = &vcpu->arch.vcore->wq;
342d3db7 2971 vcpu->arch.pgdir = current->mm->pgd;
c7b67670 2972 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
19ccb76a 2973
a8606e20
PM		 2974 do {
2975 r = kvmppc_run_vcpu(run, vcpu);
2976
2977 if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
2978 !(vcpu->arch.shregs.msr & MSR_PR)) {
3c78f78a 2979 trace_kvm_hcall_enter(vcpu);
a8606e20 2980 r = kvmppc_pseries_do_hcall(vcpu);
3c78f78a 2981 trace_kvm_hcall_exit(vcpu, r);
7e28e60e 2982 kvmppc_core_prepare_to_enter(vcpu);
913d3ff9
PM		 2983 } else if (r == RESUME_PAGE_FAULT) {
2984 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2985 r = kvmppc_book3s_hv_page_fault(run, vcpu,
2986 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
2987 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
5af50993
BH		 2988 } else if (r == RESUME_PASSTHROUGH) {
2989 if (WARN_ON(xive_enabled()))
2990 r = H_SUCCESS;
2991 else
2992 r = kvmppc_xics_rm_complete(vcpu, 0);
2993 }
e59d24e6 2994 } while (is_kvmppc_resume_guest(r));
32fad281 2995
4c3bb4cc 2996 /* Restore userspace EBB and other register values */
ca8efa1d
PM		 2997 if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
2998 mtspr(SPRN_EBBHR, ebb_regs[0]);
2999 mtspr(SPRN_EBBRR, ebb_regs[1]);
3000 mtspr(SPRN_BESCR, ebb_regs[2]);
4c3bb4cc
PM		 3001 mtspr(SPRN_TAR, user_tar);
3002 mtspr(SPRN_FSCR, current->thread.fscr);
ca8efa1d 3003 }
4c3bb4cc 3004 mtspr(SPRN_VRSAVE, user_vrsave);
ca8efa1d 3005
32fad281 3006 out:
c7b67670 3007 vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
32fad281 3008 atomic_dec(&vcpu->kvm->arch.vcpus_running);
a8606e20
PM		 3009 return r;
3010}
3011
5b74716e
BH		 3012static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
3013 int linux_psize)
3014{
3015 struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
3016
3017 if (!def->shift)
3018 return;
3019 (*sps)->page_shift = def->shift;
3020 (*sps)->slb_enc = def->sllp;
3021 (*sps)->enc[0].page_shift = def->shift;
b1022fbd 3022 (*sps)->enc[0].pte_enc = def->penc[linux_psize];
1f365bb0
AK		 3023 /*
3024 * Add 16MB MPSS support if host supports it
3025 */
3026 if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) {
3027 (*sps)->enc[1].page_shift = 24;
3028 (*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M];
3029 }
5b74716e
BH		 3030 (*sps)++;
3031}
3032
3a167bea
AK		 3033static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
3034 struct kvm_ppc_smmu_info *info)
5b74716e
BH		 3035{
3036 struct kvm_ppc_one_seg_page_size *sps;
3037
8cf4ecc0
PM		 3038 /*
3039 * Since we don't yet support HPT guests on a radix host,
3040 * return an error if the host uses radix.
3041 */
3042 if (radix_enabled())
3043 return -EINVAL;
3044
5b74716e
BH		 3045 info->flags = KVM_PPC_PAGE_SIZES_REAL;
3046 if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
3047 info->flags |= KVM_PPC_1T_SEGMENTS;
3048 info->slb_size = mmu_slb_size;
3049
3050 /* We only support these sizes for now, and no muti-size segments */
3051 sps = &info->sps[0];
3052 kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
3053 kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
3054 kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
3055
3056 return 0;
3057}
3058
82ed3616
PM		 3059/*
3060 * Get (and clear) the dirty memory log for a memory slot.
3061 */
3a167bea
AK		 3062static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
3063 struct kvm_dirty_log *log)
82ed3616 3064{
9f6b8029 3065 struct kvm_memslots *slots;
82ed3616 3066 struct kvm_memory_slot *memslot;
8f7b79b8 3067 int i, r;
82ed3616 3068 unsigned long n;
8f7b79b8
PM		 3069 unsigned long *buf;
3070 struct kvm_vcpu *vcpu;
82ed3616
PM		 3071
3072 mutex_lock(&kvm->slots_lock);
3073
3074 r = -EINVAL;
bbacc0c1 3075 if (log->slot >= KVM_USER_MEM_SLOTS)
82ed3616
PM		 3076 goto out;
3077
9f6b8029
PB		 3078 slots = kvm_memslots(kvm);
3079 memslot = id_to_memslot(slots, log->slot);
82ed3616
PM		 3080 r = -ENOENT;
3081 if (!memslot->dirty_bitmap)
3082 goto out;
3083
8f7b79b8
PM		 3084 /*
3085 * Use second half of bitmap area because radix accumulates
3086 * bits in the first half.
3087 */
82ed3616 3088 n = kvm_dirty_bitmap_bytes(memslot);
8f7b79b8
PM		 3089 buf = memslot->dirty_bitmap + n / sizeof(long);
3090 memset(buf, 0, n);
82ed3616 3091
8f7b79b8
PM		 3092 if (kvm_is_radix(kvm))
3093 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
3094 else
3095 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
82ed3616
PM		 3096 if (r)
3097 goto out;
3098
8f7b79b8
PM		 3099 /* Harvest dirty bits from VPA and DTL updates */
3100 /* Note: we never modify the SLB shadow buffer areas */
3101 kvm_for_each_vcpu(i, vcpu, kvm) {
3102 spin_lock(&vcpu->arch.vpa_update_lock);
3103 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
3104 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
3105 spin_unlock(&vcpu->arch.vpa_update_lock);
3106 }
3107
82ed3616 3108 r = -EFAULT;
8f7b79b8 3109 if (copy_to_user(log->dirty_bitmap, buf, n))
82ed3616
PM		 3110 goto out;
3111
3112 r = 0;
3113out:
3114 mutex_unlock(&kvm->slots_lock);
3115 return r;
3116}
3117
3a167bea
AK		 3118static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
3119 struct kvm_memory_slot *dont)
a66b48c3
PM		 3120{
3121 if (!dont || free->arch.rmap != dont->arch.rmap) {
3122 vfree(free->arch.rmap);
3123 free->arch.rmap = NULL;
b2b2f165 3124 }
a66b48c3
PM		 3125}
3126
3a167bea
AK		 3127static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
3128 unsigned long npages)
a66b48c3 3129{
8cf4ecc0
PM		 3130 /*
3131 * For now, if radix_enabled() then we only support radix guests,
3132 * and in that case we don't need the rmap array.
3133 */
3134 if (radix_enabled()) {
3135 slot->arch.rmap = NULL;
3136 return 0;
3137 }
3138
a66b48c3
PM		 3139 slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
3140 if (!slot->arch.rmap)
3141 return -ENOMEM;
aa04b4cc 3142
c77162de
PM		 3143 return 0;
3144}
aa04b4cc 3145
3a167bea
AK		 3146static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
3147 struct kvm_memory_slot *memslot,
09170a49 3148 const struct kvm_userspace_memory_region *mem)
c77162de 3149{
a66b48c3 3150 return 0;
c77162de
PM		 3151}
3152
3a167bea 3153static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
09170a49 3154 const struct kvm_userspace_memory_region *mem,
f36f3f28
PB		 3155 const struct kvm_memory_slot *old,
3156 const struct kvm_memory_slot *new)
c77162de 3157{
dfe49dbd 3158 unsigned long npages = mem->memory_size >> PAGE_SHIFT;
9f6b8029 3159 struct kvm_memslots *slots;
dfe49dbd
PM		 3160 struct kvm_memory_slot *memslot;
3161
a56ee9f8
YX		 3162 /*
3163 * If we are making a new memslot, it might make
3164 * some address that was previously cached as emulated
3165 * MMIO be no longer emulated MMIO, so invalidate
3166 * all the caches of emulated MMIO translations.
3167 */
3168 if (npages)
3169 atomic64_inc(&kvm->arch.mmio_update);
3170
8f7b79b8 3171 if (npages && old->npages && !kvm_is_radix(kvm)) {
dfe49dbd
PM		 3172 /*
3173 * If modifying a memslot, reset all the rmap dirty bits.
3174 * If this is a new memslot, we don't need to do anything
3175 * since the rmap array starts out as all zeroes,
3176 * i.e. no pages are dirty.
3177 */
9f6b8029
PB		 3178 slots = kvm_memslots(kvm);
3179 memslot = id_to_memslot(slots, mem->slot);
8f7b79b8 3180 kvmppc_hv_get_dirty_log_hpt(kvm, memslot, NULL);
dfe49dbd 3181 }
c77162de
PM		 3182}
3183
a0144e2a
PM		 3184/*
3185 * Update LPCR values in kvm->arch and in vcores.
3186 * Caller must hold kvm->lock.
3187 */
3188void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
3189{
3190 long int i;
3191 u32 cores_done = 0;
3192
3193 if ((kvm->arch.lpcr & mask) == lpcr)
3194 return;
3195
3196 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
3197
3198 for (i = 0; i < KVM_MAX_VCORES; ++i) {
3199 struct kvmppc_vcore *vc = kvm->arch.vcores[i];
3200 if (!vc)
3201 continue;
3202 spin_lock(&vc->lock);
3203 vc->lpcr = (vc->lpcr & ~mask) | lpcr;
3204 spin_unlock(&vc->lock);
3205 if (++cores_done >= kvm->arch.online_vcores)
3206 break;
3207 }
3208}
3209
3a167bea
AK		 3210static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
3211{
3212 return;
3213}
3214
7a84084c
PM		 3215static void kvmppc_setup_partition_table(struct kvm *kvm)
3216{
3217 unsigned long dw0, dw1;
3218
8cf4ecc0
PM		 3219 if (!kvm_is_radix(kvm)) {
3220 /* PS field - page size for VRMA */
3221 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
3222 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
3223 /* HTABSIZE and HTABORG fields */
3224 dw0 |= kvm->arch.sdr1;
7a84084c 3225
8cf4ecc0
PM		 3226 /* Second dword as set by userspace */
3227 dw1 = kvm->arch.process_table;
3228 } else {
3229 dw0 = PATB_HR | radix__get_tree_size() |
3230 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
3231 dw1 = PATB_GR | kvm->arch.process_table;
3232 }
7a84084c
PM		 3233
3234 mmu_partition_table_set_entry(kvm->arch.lpid, dw0, dw1);
3235}
3236
32fad281 3237static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
c77162de
PM		 3238{
3239 int err = 0;
3240 struct kvm *kvm = vcpu->kvm;
c77162de
PM		 3241 unsigned long hva;
3242 struct kvm_memory_slot *memslot;
3243 struct vm_area_struct *vma;
a0144e2a 3244 unsigned long lpcr = 0, senc;
c77162de 3245 unsigned long psize, porder;
2c9097e4 3246 int srcu_idx;
c77162de
PM		 3247
3248 mutex_lock(&kvm->lock);
31037eca 3249 if (kvm->arch.hpte_setup_done)
c77162de 3250 goto out; /* another vcpu beat us to it */
aa04b4cc 3251
32fad281 3252 /* Allocate hashed page table (if not done already) and reset it */
3f9d4f5a 3253 if (!kvm->arch.hpt.virt) {
aae0777f
DG		 3254 int order = KVM_DEFAULT_HPT_ORDER;
3255 struct kvm_hpt_info info;
3256
3257 err = kvmppc_allocate_hpt(&info, order);
3258 /* If we get here, it means userspace didn't specify a
3259 * size explicitly. So, try successively smaller
3260 * sizes if the default failed. */
3261 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
3262 err = kvmppc_allocate_hpt(&info, order);
3263
3264 if (err < 0) {
32fad281
PM		 3265 pr_err("KVM: Couldn't alloc HPT\n");
3266 goto out;
3267 }
aae0777f
DG		 3268
3269 kvmppc_set_hpt(kvm, &info);
32fad281
PM		 3270 }
3271
c77162de 3272 /* Look up the memslot for guest physical address 0 */
2c9097e4 3273 srcu_idx = srcu_read_lock(&kvm->srcu);
c77162de 3274 memslot = gfn_to_memslot(kvm, 0);
aa04b4cc 3275
c77162de
PM		 3276 /* We must have some memory at 0 by now */
3277 err = -EINVAL;
3278 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
2c9097e4 3279 goto out_srcu;
c77162de
PM		 3280
3281 /* Look up the VMA for the start of this memory slot */
3282 hva = memslot->userspace_addr;
3283 down_read(&current->mm->mmap_sem);
3284 vma = find_vma(current->mm, hva);
3285 if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
3286 goto up_out;
3287
3288 psize = vma_kernel_pagesize(vma);
da9d1d7f 3289 porder = __ilog2(psize);
c77162de 3290
c77162de
PM		 3291 up_read(&current->mm->mmap_sem);
3292
c17b98cf
PM		 3293 /* We can handle 4k, 64k or 16M pages in the VRMA */
3294 err = -EINVAL;
3295 if (!(psize == 0x1000 || psize == 0x10000 ||
3296 psize == 0x1000000))
3297 goto out_srcu;
c77162de 3298
c17b98cf
PM		 3299 senc = slb_pgsize_encoding(psize);
3300 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
3301 (VRMA_VSID << SLB_VSID_SHIFT_1T);
c17b98cf
PM		 3302 /* Create HPTEs in the hash page table for the VRMA */
3303 kvmppc_map_vrma(vcpu, memslot, porder);
aa04b4cc 3304
7a84084c
PM		 3305 /* Update VRMASD field in the LPCR */
3306 if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
3307 /* the -4 is to account for senc values starting at 0x10 */
3308 lpcr = senc << (LPCR_VRMASD_SH - 4);
3309 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
3310 } else {
3311 kvmppc_setup_partition_table(kvm);
3312 }
a0144e2a 3313
31037eca 3314 /* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */
c77162de 3315 smp_wmb();
31037eca 3316 kvm->arch.hpte_setup_done = 1;
c77162de 3317 err = 0;
2c9097e4
PM		 3318 out_srcu:
3319 srcu_read_unlock(&kvm->srcu, srcu_idx);
c77162de
PM		 3320 out:
3321 mutex_unlock(&kvm->lock);
3322 return err;
b2b2f165 3323
c77162de
PM		 3324 up_out:
3325 up_read(&current->mm->mmap_sem);
505d6421 3326 goto out_srcu;
de56a948
PM		 3327}
3328
79b6c247
SW		 3329#ifdef CONFIG_KVM_XICS
3330/*
3331 * Allocate a per-core structure for managing state about which cores are
3332 * running in the host versus the guest and for exchanging data between
3333 * real mode KVM and CPU running in the host.
3334 * This is only done for the first VM.
3335 * The allocated structure stays even if all VMs have stopped.
3336 * It is only freed when the kvm-hv module is unloaded.
3337 * It's OK for this routine to fail, we just don't support host
3338 * core operations like redirecting H_IPI wakeups.
3339 */
3340void kvmppc_alloc_host_rm_ops(void)
3341{
3342 struct kvmppc_host_rm_ops *ops;
3343 unsigned long l_ops;
3344 int cpu, core;
3345 int size;
3346
3347 /* Not the first time here ? */
3348 if (kvmppc_host_rm_ops_hv != NULL)
3349 return;
3350
3351 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
3352 if (!ops)
3353 return;
3354
3355 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
3356 ops->rm_core = kzalloc(size, GFP_KERNEL);
3357
3358 if (!ops->rm_core) {
3359 kfree(ops);
3360 return;
3361 }
3362
6f3bb809
SW		 3363 get_online_cpus();
3364
79b6c247
SW		 3365 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
3366 if (!cpu_online(cpu))
3367 continue;
3368
3369 core = cpu >> threads_shift;
3370 ops->rm_core[core].rm_state.in_host = 1;
3371 }
3372
0c2a6606
SW		 3373 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
3374
79b6c247
SW		 3375 /*
3376 * Make the contents of the kvmppc_host_rm_ops structure visible
3377 * to other CPUs before we assign it to the global variable.
3378 * Do an atomic assignment (no locks used here), but if someone
3379 * beats us to it, just free our copy and return.
3380 */
3381 smp_wmb();
3382 l_ops = (unsigned long) ops;
3383
3384 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
6f3bb809 3385 put_online_cpus();
79b6c247
SW		 3386 kfree(ops->rm_core);
3387 kfree(ops);
6f3bb809 3388 return;
79b6c247 3389 }
6f3bb809 3390
3f7cd919
AMG		 3391 cpuhp_setup_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE,
3392 "ppc/kvm_book3s:prepare",
3393 kvmppc_set_host_core,
3394 kvmppc_clear_host_core);
6f3bb809 3395 put_online_cpus();
79b6c247
SW		 3396}
3397
3398void kvmppc_free_host_rm_ops(void)
3399{
3400 if (kvmppc_host_rm_ops_hv) {
3f7cd919 3401 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
79b6c247
SW		 3402 kfree(kvmppc_host_rm_ops_hv->rm_core);
3403 kfree(kvmppc_host_rm_ops_hv);
3404 kvmppc_host_rm_ops_hv = NULL;
3405 }
3406}
3407#endif
3408
3a167bea 3409static int kvmppc_core_init_vm_hv(struct kvm *kvm)
de56a948 3410{
32fad281 3411 unsigned long lpcr, lpid;
e23a808b 3412 char buf[32];
8cf4ecc0 3413 int ret;
de56a948 3414
32fad281
PM		 3415 /* Allocate the guest's logical partition ID */
3416
3417 lpid = kvmppc_alloc_lpid();
5d226ae5 3418 if ((long)lpid < 0)
32fad281
PM		 3419 return -ENOMEM;
3420 kvm->arch.lpid = lpid;
de56a948 3421
79b6c247
SW		 3422 kvmppc_alloc_host_rm_ops();
3423
1b400ba0
PM		 3424 /*
3425 * Since we don't flush the TLB when tearing down a VM,
3426 * and this lpid might have previously been used,
3427 * make sure we flush on each core before running the new VM.
7c5b06ca
PM		 3428 * On POWER9, the tlbie in mmu_partition_table_set_entry()
3429 * does this flush for us.
1b400ba0 3430 */
7c5b06ca
PM		 3431 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3432 cpumask_setall(&kvm->arch.need_tlb_flush);
1b400ba0 3433
699a0ea0
PM		 3434 /* Start out with the default set of hcalls enabled */
3435 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
3436 sizeof(kvm->arch.enabled_hcalls));
3437
7a84084c
PM		 3438 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3439 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
aa04b4cc 3440
c17b98cf
PM		 3441 /* Init LPCR for virtual RMA mode */
3442 kvm->arch.host_lpid = mfspr(SPRN_LPID);
3443 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
3444 lpcr &= LPCR_PECE | LPCR_LPES;
3445 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
3446 LPCR_VPM0 | LPCR_VPM1;
3447 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
3448 (VRMA_VSID << SLB_VSID_SHIFT_1T);
3449 /* On POWER8 turn on online bit to enable PURR/SPURR */
3450 if (cpu_has_feature(CPU_FTR_ARCH_207S))
3451 lpcr |= LPCR_ONL;
84f7139c
PM		 3452 /*
3453 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
3454 * Set HVICE bit to enable hypervisor virtualization interrupts.
5af50993
BH		 3455 * Set HEIC to prevent OS interrupts to go to hypervisor (should
3456 * be unnecessary but better safe than sorry in case we re-enable
3457 * EE in HV mode with this LPCR still set)
84f7139c
PM		 3458 */
3459 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
7a84084c 3460 lpcr &= ~LPCR_VPM0;
5af50993
BH		 3461 lpcr |= LPCR_HVICE | LPCR_HEIC;
3462
3463 /*
3464 * If xive is enabled, we route 0x500 interrupts directly
3465 * to the guest.
3466 */
3467 if (xive_enabled())
3468 lpcr |= LPCR_LPES;
84f7139c
PM		 3469 }
3470
8cf4ecc0
PM		 3471 /*
3472 * For now, if the host uses radix, the guest must be radix.
3473 */
3474 if (radix_enabled()) {
3475 kvm->arch.radix = 1;
3476 lpcr &= ~LPCR_VPM1;
3477 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
3478 ret = kvmppc_init_vm_radix(kvm);
3479 if (ret) {
3480 kvmppc_free_lpid(kvm->arch.lpid);
3481 return ret;
3482 }
3483 kvmppc_setup_partition_table(kvm);
3484 }
3485
9e368f29 3486 kvm->arch.lpcr = lpcr;
aa04b4cc 3487
5e985969
DG		 3488 /* Initialization for future HPT resizes */
3489 kvm->arch.resize_hpt = NULL;
3490
7c5b06ca
PM		 3491 /*
3492 * Work out how many sets the TLB has, for the use of
3493 * the TLB invalidation loop in book3s_hv_rmhandlers.S.
3494 */
8cf4ecc0
PM		 3495 if (kvm_is_radix(kvm))
3496 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
3497 else if (cpu_has_feature(CPU_FTR_ARCH_300))
7c5b06ca
PM		 3498 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
3499 else if (cpu_has_feature(CPU_FTR_ARCH_207S))
3500 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
3501 else
3502 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
3503
512691d4 3504 /*
441c19c8
ME		 3505 * Track that we now have a HV mode VM active. This blocks secondary
3506 * CPU threads from coming online.
8cf4ecc0
PM		 3507 * On POWER9, we only need to do this for HPT guests on a radix
3508 * host, which is not yet supported.
512691d4 3509 */
8cf4ecc0
PM		 3510 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3511 kvm_hv_vm_activated();
512691d4 3512
e23a808b
PM		 3513 /*
3514 * Create a debugfs directory for the VM
3515 */
3516 snprintf(buf, sizeof(buf), "vm%d", current->pid);
3517 kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
3518 if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
3519 kvmppc_mmu_debugfs_init(kvm);
3520
54738c09 3521 return 0;
de56a948
PM		 3522}
3523
f1378b1c
PM		 3524static void kvmppc_free_vcores(struct kvm *kvm)
3525{
3526 long int i;
3527
23316316 3528 for (i = 0; i < KVM_MAX_VCORES; ++i)
f1378b1c
PM		 3529 kfree(kvm->arch.vcores[i]);
3530 kvm->arch.online_vcores = 0;
3531}
3532
3a167bea 3533static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
de56a948 3534{
e23a808b
PM		 3535 debugfs_remove_recursive(kvm->arch.debugfs_dir);
3536
8cf4ecc0
PM		 3537 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3538 kvm_hv_vm_deactivated();
512691d4 3539
f1378b1c 3540 kvmppc_free_vcores(kvm);
aa04b4cc 3541
8cf4ecc0
PM		 3542 kvmppc_free_lpid(kvm->arch.lpid);
3543
5a319350
PM		 3544 if (kvm_is_radix(kvm))
3545 kvmppc_free_radix(kvm);
3546 else
aae0777f 3547 kvmppc_free_hpt(&kvm->arch.hpt);
c57875f5
SW		 3548
3549 kvmppc_free_pimap(kvm);
de56a948
PM		 3550}
3551
3a167bea
AK		 3552/* We don't need to emulate any privileged instructions or dcbz */
3553static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
3554 unsigned int inst, int *advance)
de56a948 3555{
3a167bea 3556 return EMULATE_FAIL;
de56a948
PM		 3557}
3558
3a167bea
AK		 3559static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
3560 ulong spr_val)
de56a948
PM		 3561{
3562 return EMULATE_FAIL;
3563}
3564
3a167bea
AK		 3565static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
3566 ulong *spr_val)
de56a948
PM		 3567{
3568 return EMULATE_FAIL;
3569}
3570
3a167bea 3571static int kvmppc_core_check_processor_compat_hv(void)
de56a948 3572{
c17b98cf
PM		 3573 if (!cpu_has_feature(CPU_FTR_HVMODE) ||
3574 !cpu_has_feature(CPU_FTR_ARCH_206))
3a167bea 3575 return -EIO;
50de596d 3576
3a167bea 3577 return 0;
de56a948
PM		 3578}
3579
8daaafc8
SW		 3580#ifdef CONFIG_KVM_XICS
3581
3582void kvmppc_free_pimap(struct kvm *kvm)
3583{
3584 kfree(kvm->arch.pimap);
3585}
3586
c57875f5 3587static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
8daaafc8
SW		 3588{
3589 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
3590}
c57875f5
SW		 3591
3592static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
3593{
3594 struct irq_desc *desc;
3595 struct kvmppc_irq_map *irq_map;
3596 struct kvmppc_passthru_irqmap *pimap;
3597 struct irq_chip *chip;
5af50993 3598 int i, rc = 0;
c57875f5 3599
644abbb2
SW		 3600 if (!kvm_irq_bypass)
3601 return 1;
3602
c57875f5
SW		 3603 desc = irq_to_desc(host_irq);
3604 if (!desc)
3605 return -EIO;
3606
3607 mutex_lock(&kvm->lock);
3608
3609 pimap = kvm->arch.pimap;
3610 if (pimap == NULL) {
3611 /* First call, allocate structure to hold IRQ map */
3612 pimap = kvmppc_alloc_pimap();
3613 if (pimap == NULL) {
3614 mutex_unlock(&kvm->lock);
3615 return -ENOMEM;
3616 }
3617 kvm->arch.pimap = pimap;
3618 }
3619
3620 /*
3621 * For now, we only support interrupts for which the EOI operation
3622 * is an OPAL call followed by a write to XIRR, since that's
5af50993 3623 * what our real-mode EOI code does, or a XIVE interrupt
c57875f5
SW		 3624 */
3625 chip = irq_data_get_irq_chip(&desc->irq_data);
5af50993 3626 if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) {
c57875f5
SW		 3627 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
3628 host_irq, guest_gsi);
3629 mutex_unlock(&kvm->lock);
3630 return -ENOENT;
3631 }
3632
3633 /*
3634 * See if we already have an entry for this guest IRQ number.
3635 * If it's mapped to a hardware IRQ number, that's an error,
3636 * otherwise re-use this entry.
3637 */
3638 for (i = 0; i < pimap->n_mapped; i++) {
3639 if (guest_gsi == pimap->mapped[i].v_hwirq) {
3640 if (pimap->mapped[i].r_hwirq) {
3641 mutex_unlock(&kvm->lock);
3642 return -EINVAL;
3643 }
3644 break;
3645 }
3646 }
3647
3648 if (i == KVMPPC_PIRQ_MAPPED) {
3649 mutex_unlock(&kvm->lock);
3650 return -EAGAIN; /* table is full */
3651 }
3652
3653 irq_map = &pimap->mapped[i];
3654
3655 irq_map->v_hwirq = guest_gsi;
c57875f5
SW		 3656 irq_map->desc = desc;
3657
e3c13e56
SW		 3658 /*
3659 * Order the above two stores before the next to serialize with
3660 * the KVM real mode handler.
3661 */
3662 smp_wmb();
3663 irq_map->r_hwirq = desc->irq_data.hwirq;
3664
c57875f5
SW		 3665 if (i == pimap->n_mapped)
3666 pimap->n_mapped++;
3667
5af50993
BH		 3668 if (xive_enabled())
3669 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc);
3670 else
3671 kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq);
3672 if (rc)
3673 irq_map->r_hwirq = 0;
5d375199 3674
c57875f5
SW		 3675 mutex_unlock(&kvm->lock);
3676
3677 return 0;
3678}
3679
3680static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
3681{
3682 struct irq_desc *desc;
3683 struct kvmppc_passthru_irqmap *pimap;
5af50993 3684 int i, rc = 0;
c57875f5 3685
644abbb2
SW		 3686 if (!kvm_irq_bypass)
3687 return 0;
3688
c57875f5
SW		 3689 desc = irq_to_desc(host_irq);
3690 if (!desc)
3691 return -EIO;
3692
3693 mutex_lock(&kvm->lock);
a1c52e1c
ME		 3694 if (!kvm->arch.pimap)
3695 goto unlock;
c57875f5 3696
c57875f5
SW		 3697 pimap = kvm->arch.pimap;
3698
3699 for (i = 0; i < pimap->n_mapped; i++) {
3700 if (guest_gsi == pimap->mapped[i].v_hwirq)
3701 break;
3702 }
3703
3704 if (i == pimap->n_mapped) {
3705 mutex_unlock(&kvm->lock);
3706 return -ENODEV;
3707 }
3708
5af50993
BH		 3709 if (xive_enabled())
3710 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc);
3711 else
3712 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
5d375199 3713
5af50993 3714 /* invalidate the entry (what do do on error from the above ?) */
c57875f5
SW		 3715 pimap->mapped[i].r_hwirq = 0;
3716
3717 /*
3718 * We don't free this structure even when the count goes to
3719 * zero. The structure is freed when we destroy the VM.
3720 */
a1c52e1c 3721 unlock:
c57875f5 3722 mutex_unlock(&kvm->lock);
5af50993 3723 return rc;
c57875f5
SW		 3724}
3725
3726static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
3727 struct irq_bypass_producer *prod)
3728{
3729 int ret = 0;
3730 struct kvm_kernel_irqfd *irqfd =
3731 container_of(cons, struct kvm_kernel_irqfd, consumer);
3732
3733 irqfd->producer = prod;
3734
3735 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
3736 if (ret)
3737 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
3738 prod->irq, irqfd->gsi, ret);
3739
3740 return ret;
3741}
3742
3743static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
3744 struct irq_bypass_producer *prod)
3745{
3746 int ret;
3747 struct kvm_kernel_irqfd *irqfd =
3748 container_of(cons, struct kvm_kernel_irqfd, consumer);
3749
3750 irqfd->producer = NULL;
3751
3752 /*
3753 * When producer of consumer is unregistered, we change back to
3754 * default external interrupt handling mode - KVM real mode
3755 * will switch back to host.
3756 */
3757 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
3758 if (ret)
3759 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
3760 prod->irq, irqfd->gsi, ret);
3761}
8daaafc8
SW		 3762#endif
3763
3a167bea
AK		 3764static long kvm_arch_vm_ioctl_hv(struct file *filp,
3765 unsigned int ioctl, unsigned long arg)
3766{
3767 struct kvm *kvm __maybe_unused = filp->private_data;
3768 void __user *argp = (void __user *)arg;
3769 long r;
3770
3771 switch (ioctl) {
3772
3a167bea
AK		 3773 case KVM_PPC_ALLOCATE_HTAB: {
3774 u32 htab_order;
3775
3776 r = -EFAULT;
3777 if (get_user(htab_order, (u32 __user *)argp))
3778 break;
f98a8bf9 3779 r = kvmppc_alloc_reset_hpt(kvm, htab_order);
3a167bea
AK		 3780 if (r)
3781 break;
3a167bea
AK		 3782 r = 0;
3783 break;
3784 }
3785
3786 case KVM_PPC_GET_HTAB_FD: {
3787 struct kvm_get_htab_fd ghf;
3788
3789 r = -EFAULT;
3790 if (copy_from_user(&ghf, argp, sizeof(ghf)))
3791 break;
3792 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
3793 break;
3794 }
3795
5e985969
DG		 3796 case KVM_PPC_RESIZE_HPT_PREPARE: {
3797 struct kvm_ppc_resize_hpt rhpt;
3798
3799 r = -EFAULT;
3800 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
3801 break;
3802
3803 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
3804 break;
3805 }
3806
3807 case KVM_PPC_RESIZE_HPT_COMMIT: {
3808 struct kvm_ppc_resize_hpt rhpt;
3809
3810 r = -EFAULT;
3811 if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
3812 break;
3813
3814 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
3815 break;
3816 }
3817
3a167bea
AK		 3818 default:
3819 r = -ENOTTY;
3820 }
3821
3822 return r;
3823}
3824
699a0ea0
PM		 3825/*
3826 * List of hcall numbers to enable by default.
3827 * For compatibility with old userspace, we enable by default
3828 * all hcalls that were implemented before the hcall-enabling
3829 * facility was added. Note this list should not include H_RTAS.
3830 */
3831static unsigned int default_hcall_list[] = {
3832 H_REMOVE,
3833 H_ENTER,
3834 H_READ,
3835 H_PROTECT,
3836 H_BULK_REMOVE,
3837 H_GET_TCE,
3838 H_PUT_TCE,
3839 H_SET_DABR,
3840 H_SET_XDABR,
3841 H_CEDE,
3842 H_PROD,
3843 H_CONFER,
3844 H_REGISTER_VPA,
3845#ifdef CONFIG_KVM_XICS
3846 H_EOI,
3847 H_CPPR,
3848 H_IPI,
3849 H_IPOLL,
3850 H_XIRR,
3851 H_XIRR_X,
3852#endif
3853 0
3854};
3855
3856static void init_default_hcalls(void)
3857{
3858 int i;
ae2113a4 3859 unsigned int hcall;
699a0ea0 3860
ae2113a4
PM		 3861 for (i = 0; default_hcall_list[i]; ++i) {
3862 hcall = default_hcall_list[i];
3863 WARN_ON(!kvmppc_hcall_impl_hv(hcall));
3864 __set_bit(hcall / 4, default_enabled_hcalls);
3865 }
699a0ea0
PM		 3866}
3867
c9270132
PM		 3868static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
3869{
468808bd 3870 unsigned long lpcr;
8cf4ecc0 3871 int radix;
468808bd
PM		 3872
3873 /* If not on a POWER9, reject it */
3874 if (!cpu_has_feature(CPU_FTR_ARCH_300))
3875 return -ENODEV;
3876
3877 /* If any unknown flags set, reject it */
3878 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
3879 return -EINVAL;
3880
8cf4ecc0
PM		 3881 /* We can't change a guest to/from radix yet */
3882 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
3883 if (radix != kvm_is_radix(kvm))
468808bd
PM		 3884 return -EINVAL;
3885
3886 /* GR (guest radix) bit in process_table field must match */
8cf4ecc0 3887 if (!!(cfg->process_table & PATB_GR) != radix)
468808bd
PM		 3888 return -EINVAL;
3889
3890 /* Process table size field must be reasonable, i.e. <= 24 */
3891 if ((cfg->process_table & PRTS_MASK) > 24)
3892 return -EINVAL;
3893
3894 kvm->arch.process_table = cfg->process_table;
3895 kvmppc_setup_partition_table(kvm);
3896
3897 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
3898 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
3899
3900 return 0;
c9270132
PM		 3901}
3902
cbbc58d4 3903static struct kvmppc_ops kvm_ops_hv = {
3a167bea
AK		 3904 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
3905 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
3906 .get_one_reg = kvmppc_get_one_reg_hv,
3907 .set_one_reg = kvmppc_set_one_reg_hv,
3908 .vcpu_load = kvmppc_core_vcpu_load_hv,
3909 .vcpu_put = kvmppc_core_vcpu_put_hv,
3910 .set_msr = kvmppc_set_msr_hv,
3911 .vcpu_run = kvmppc_vcpu_run_hv,
3912 .vcpu_create = kvmppc_core_vcpu_create_hv,
3913 .vcpu_free = kvmppc_core_vcpu_free_hv,
3914 .check_requests = kvmppc_core_check_requests_hv,
3915 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
3916 .flush_memslot = kvmppc_core_flush_memslot_hv,
3917 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
3918 .commit_memory_region = kvmppc_core_commit_memory_region_hv,
3919 .unmap_hva = kvm_unmap_hva_hv,
3920 .unmap_hva_range = kvm_unmap_hva_range_hv,
3921 .age_hva = kvm_age_hva_hv,
3922 .test_age_hva = kvm_test_age_hva_hv,
3923 .set_spte_hva = kvm_set_spte_hva_hv,
3924 .mmu_destroy = kvmppc_mmu_destroy_hv,
3925 .free_memslot = kvmppc_core_free_memslot_hv,
3926 .create_memslot = kvmppc_core_create_memslot_hv,
3927 .init_vm = kvmppc_core_init_vm_hv,
3928 .destroy_vm = kvmppc_core_destroy_vm_hv,
3a167bea
AK		 3929 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
3930 .emulate_op = kvmppc_core_emulate_op_hv,
3931 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
3932 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
3933 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
3934 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
ae2113a4 3935 .hcall_implemented = kvmppc_hcall_impl_hv,
c57875f5
SW		 3936#ifdef CONFIG_KVM_XICS
3937 .irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
3938 .irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
3939#endif
c9270132
PM		 3940 .configure_mmu = kvmhv_configure_mmu,
3941 .get_rmmu_info = kvmhv_get_rmmu_info,
3a167bea
AK		 3942};
3943
fd7bacbc
MS		 3944static int kvm_init_subcore_bitmap(void)
3945{
3946 int i, j;
3947 int nr_cores = cpu_nr_cores();
3948 struct sibling_subcore_state *sibling_subcore_state;
3949
3950 for (i = 0; i < nr_cores; i++) {
3951 int first_cpu = i * threads_per_core;
3952 int node = cpu_to_node(first_cpu);
3953
3954 /* Ignore if it is already allocated. */
3955 if (paca[first_cpu].sibling_subcore_state)
3956 continue;
3957
3958 sibling_subcore_state =
3959 kmalloc_node(sizeof(struct sibling_subcore_state),
3960 GFP_KERNEL, node);
3961 if (!sibling_subcore_state)
3962 return -ENOMEM;
3963
3964 memset(sibling_subcore_state, 0,
3965 sizeof(struct sibling_subcore_state));
3966
3967 for (j = 0; j < threads_per_core; j++) {
3968 int cpu = first_cpu + j;
3969
3970 paca[cpu].sibling_subcore_state = sibling_subcore_state;
3971 }
3972 }
3973 return 0;
3974}
3975
5a319350
PM		 3976static int kvmppc_radix_possible(void)
3977{
3978 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
3979}
3980
3a167bea 3981static int kvmppc_book3s_init_hv(void)
de56a948
PM		 3982{
3983 int r;
cbbc58d4
AK		 3984 /*
3985 * FIXME!! Do we need to check on all cpus ?
3986 */
3987 r = kvmppc_core_check_processor_compat_hv();
3988 if (r < 0)
739e2425 3989 return -ENODEV;
de56a948 3990
fd7bacbc
MS		 3991 r = kvm_init_subcore_bitmap();
3992 if (r)
3993 return r;
3994
f725758b
PM		 3995 /*
3996 * We need a way of accessing the XICS interrupt controller,
3997 * either directly, via paca[cpu].kvm_hstate.xics_phys, or
3998 * indirectly, via OPAL.
3999 */
4000#ifdef CONFIG_SMP
fb7dcf72 4001 if (!xive_enabled() && !local_paca->kvm_hstate.xics_phys) {
f725758b
PM		 4002 struct device_node *np;
4003
4004 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
4005 if (!np) {
4006 pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
4007 return -ENODEV;
4008 }
4009 }
4010#endif
4011
cbbc58d4
AK		 4012 kvm_ops_hv.owner = THIS_MODULE;
4013 kvmppc_hv_ops = &kvm_ops_hv;
de56a948 4014
699a0ea0
PM		 4015 init_default_hcalls();
4016
ec257165
PM		 4017 init_vcore_lists();
4018
cbbc58d4 4019 r = kvmppc_mmu_hv_init();
5a319350
PM		 4020 if (r)
4021 return r;
4022
4023 if (kvmppc_radix_possible())
4024 r = kvmppc_radix_init();
de56a948
PM		 4025 return r;
4026}
4027
3a167bea 4028static void kvmppc_book3s_exit_hv(void)
de56a948 4029{
79b6c247 4030 kvmppc_free_host_rm_ops();
5a319350
PM		 4031 if (kvmppc_radix_possible())
4032 kvmppc_radix_exit();
cbbc58d4 4033 kvmppc_hv_ops = NULL;
de56a948
PM		 4034}
4035
3a167bea
AK		 4036module_init(kvmppc_book3s_init_hv);
4037module_exit(kvmppc_book3s_exit_hv);
2ba9f0d8 4038MODULE_LICENSE("GPL");
398a76c6
AG		 4039MODULE_ALIAS_MISCDEV(KVM_MINOR);
4040MODULE_ALIAS("devname:kvm");
7c5b06ca 4041
Empty description
This page took 0.951555 seconds and 4 git commands to generate.