1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/kernel.h>
3 #include <linux/kvm_host.h>
4 #include <asm/asm-prototypes.h>
5 #include <asm/dbell.h>
6 #include <asm/ppc-opcode.h>
7
8 #include "book3s_hv.h"
9
10 static void load_spr_state(struct kvm_vcpu *vcpu,
11 struct p9_host_os_sprs *host_os_sprs)
12 {
13 /* TAR is very fast */
14 mtspr(SPRN_TAR, vcpu->arch.tar);
15
16 #ifdef CONFIG_ALTIVEC
17 if (cpu_has_feature(CPU_FTR_ALTIVEC) &&
18 current->thread.vrsave != vcpu->arch.vrsave)
19 mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
20 #endif
21
22 if (vcpu->arch.hfscr & HFSCR_EBB) {
23 if (current->thread.ebbhr != vcpu->arch.ebbhr)
24 mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
25 if (current->thread.ebbrr != vcpu->arch.ebbrr)
26 mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
27 if (current->thread.bescr != vcpu->arch.bescr)
28 mtspr(SPRN_BESCR, vcpu->arch.bescr);
29 }
30
31 if (cpu_has_feature(CPU_FTR_P9_TIDR) &&
32 current->thread.tidr != vcpu->arch.tid)
33 mtspr(SPRN_TIDR, vcpu->arch.tid);
34 if (host_os_sprs->iamr != vcpu->arch.iamr)
35 mtspr(SPRN_IAMR, vcpu->arch.iamr);
36 if (host_os_sprs->amr != vcpu->arch.amr)
37 mtspr(SPRN_AMR, vcpu->arch.amr);
38 if (vcpu->arch.uamor != 0)
39 mtspr(SPRN_UAMOR, vcpu->arch.uamor);
40 if (current->thread.fscr != vcpu->arch.fscr)
41 mtspr(SPRN_FSCR, vcpu->arch.fscr);
42 if (current->thread.dscr != vcpu->arch.dscr)
43 mtspr(SPRN_DSCR, vcpu->arch.dscr);
44 if (vcpu->arch.pspb != 0)
45 mtspr(SPRN_PSPB, vcpu->arch.pspb);
46
47 /*
48 * DAR, DSISR, and for nested HV, SPRGs must be set with MSR[RI]
49 * clear (or hstate set appropriately to catch those registers
50 * being clobbered if we take a MCE or SRESET), so those are done
51 * later.
52 */
53
54 if (!(vcpu->arch.ctrl & 1))
55 mtspr(SPRN_CTRLT, 0);
56 }
57
58 static void store_spr_state(struct kvm_vcpu *vcpu)
59 {
60 vcpu->arch.tar = mfspr(SPRN_TAR);
61
62 #ifdef CONFIG_ALTIVEC
63 if (cpu_has_feature(CPU_FTR_ALTIVEC))
64 vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
65 #endif
66
67 if (vcpu->arch.hfscr & HFSCR_EBB) {
68 vcpu->arch.ebbhr = mfspr(SPRN_EBBHR);
69 vcpu->arch.ebbrr = mfspr(SPRN_EBBRR);
70 vcpu->arch.bescr = mfspr(SPRN_BESCR);
71 }
72
73 if (cpu_has_feature(CPU_FTR_P9_TIDR))
74 vcpu->arch.tid = mfspr(SPRN_TIDR);
75 vcpu->arch.iamr = mfspr(SPRN_IAMR);
76 vcpu->arch.amr = mfspr(SPRN_AMR);
77 vcpu->arch.uamor = mfspr(SPRN_UAMOR);
78 vcpu->arch.fscr = mfspr(SPRN_FSCR);
79 vcpu->arch.dscr = mfspr(SPRN_DSCR);
80 vcpu->arch.pspb = mfspr(SPRN_PSPB);
81
82 vcpu->arch.ctrl = mfspr(SPRN_CTRLF);
83 }
84
85 /* Returns true if current MSR and/or guest MSR may have changed */
86 bool load_vcpu_state(struct kvm_vcpu *vcpu,
87 struct p9_host_os_sprs *host_os_sprs)
88 {
89 bool ret = false;
90
91 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
92 if (cpu_has_feature(CPU_FTR_TM) ||
93 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) {
94 unsigned long guest_msr = vcpu->arch.shregs.msr;
95 if (MSR_TM_ACTIVE(guest_msr)) {
96 kvmppc_restore_tm_hv(vcpu, guest_msr, true);
97 ret = true;
98 } else if (vcpu->arch.hfscr & HFSCR_TM) {
99 mtspr(SPRN_TEXASR, vcpu->arch.texasr);
100 mtspr(SPRN_TFHAR, vcpu->arch.tfhar);
101 mtspr(SPRN_TFIAR, vcpu->arch.tfiar);
102 }
103 }
104 #endif
105
106 load_spr_state(vcpu, host_os_sprs);
107
108 load_fp_state(&vcpu->arch.fp);
109 #ifdef CONFIG_ALTIVEC
110 load_vr_state(&vcpu->arch.vr);
111 #endif
112
113 return ret;
114 }
115 EXPORT_SYMBOL_GPL(load_vcpu_state);
116
117 void store_vcpu_state(struct kvm_vcpu *vcpu)
118 {
119 store_spr_state(vcpu);
120
121 store_fp_state(&vcpu->arch.fp);
122 #ifdef CONFIG_ALTIVEC
123 store_vr_state(&vcpu->arch.vr);
124 #endif
125
126 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
127 if (cpu_has_feature(CPU_FTR_TM) ||
128 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) {
129 unsigned long guest_msr = vcpu->arch.shregs.msr;
130 if (MSR_TM_ACTIVE(guest_msr)) {
131 kvmppc_save_tm_hv(vcpu, guest_msr, true);
132 } else if (vcpu->arch.hfscr & HFSCR_TM) {
133 vcpu->arch.texasr = mfspr(SPRN_TEXASR);
134 vcpu->arch.tfhar = mfspr(SPRN_TFHAR);
135 vcpu->arch.tfiar = mfspr(SPRN_TFIAR);
136
137 if (!vcpu->arch.nested) {
138 vcpu->arch.load_tm++; /* see load_ebb comment */
139 if (!vcpu->arch.load_tm)
140 vcpu->arch.hfscr &= ~HFSCR_TM;
141 }
142 }
143 }
144 #endif
145 }
146 EXPORT_SYMBOL_GPL(store_vcpu_state);
147
148 void save_p9_host_os_sprs(struct p9_host_os_sprs *host_os_sprs)
149 {
150 host_os_sprs->iamr = mfspr(SPRN_IAMR);
151 host_os_sprs->amr = mfspr(SPRN_AMR);
152 }
153 EXPORT_SYMBOL_GPL(save_p9_host_os_sprs);
154
155 /* vcpu guest regs must already be saved */
156 void restore_p9_host_os_sprs(struct kvm_vcpu *vcpu,
157 struct p9_host_os_sprs *host_os_sprs)
158 {
159 /*
160 * current->thread.xxx registers must all be restored to host
161 * values before a potential context switch, otherwise the context
162 * switch itself will overwrite current->thread.xxx with the values
163 * from the guest SPRs.
164 */
165
166 mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
167
168 if (cpu_has_feature(CPU_FTR_P9_TIDR) &&
169 current->thread.tidr != vcpu->arch.tid)
170 mtspr(SPRN_TIDR, current->thread.tidr);
171 if (host_os_sprs->iamr != vcpu->arch.iamr)
172 mtspr(SPRN_IAMR, host_os_sprs->iamr);
173 if (vcpu->arch.uamor != 0)
174 mtspr(SPRN_UAMOR, 0);
175 if (host_os_sprs->amr != vcpu->arch.amr)
176 mtspr(SPRN_AMR, host_os_sprs->amr);
177 if (current->thread.fscr != vcpu->arch.fscr)
178 mtspr(SPRN_FSCR, current->thread.fscr);
179 if (current->thread.dscr != vcpu->arch.dscr)
180 mtspr(SPRN_DSCR, current->thread.dscr);
181 if (vcpu->arch.pspb != 0)
182 mtspr(SPRN_PSPB, 0);
183
184 /* Save guest CTRL register, set runlatch to 1 */
185 if (!(vcpu->arch.ctrl & 1))
186 mtspr(SPRN_CTRLT, 1);
187
188 #ifdef CONFIG_ALTIVEC
189 if (cpu_has_feature(CPU_FTR_ALTIVEC) &&
190 vcpu->arch.vrsave != current->thread.vrsave)
191 mtspr(SPRN_VRSAVE, current->thread.vrsave);
192 #endif
193 if (vcpu->arch.hfscr & HFSCR_EBB) {
194 if (vcpu->arch.bescr != current->thread.bescr)
195 mtspr(SPRN_BESCR, current->thread.bescr);
196 if (vcpu->arch.ebbhr != current->thread.ebbhr)
197 mtspr(SPRN_EBBHR, current->thread.ebbhr);
198 if (vcpu->arch.ebbrr != current->thread.ebbrr)
199 mtspr(SPRN_EBBRR, current->thread.ebbrr);
200
201 if (!vcpu->arch.nested) {
202 /*
203 * This is like load_fp in context switching, turn off
204 * the facility after it wraps the u8 to try avoiding
205 * saving and restoring the registers each partition
206 * switch.
207 */
208 vcpu->arch.load_ebb++;
209 if (!vcpu->arch.load_ebb)
210 vcpu->arch.hfscr &= ~HFSCR_EBB;
211 }
212 }
213
214 if (vcpu->arch.tar != current->thread.tar)
215 mtspr(SPRN_TAR, current->thread.tar);
216 }
217 EXPORT_SYMBOL_GPL(restore_p9_host_os_sprs);
218
219 #ifdef CONFIG_KVM_BOOK3S_HV_P9_TIMING
220 void accumulate_time(struct kvm_vcpu *vcpu, struct kvmhv_tb_accumulator *next)
221 {
222 struct kvmppc_vcore *vc = vcpu->arch.vcore;
223 struct kvmhv_tb_accumulator *curr;
224 u64 tb = mftb() - vc->tb_offset_applied;
225 u64 prev_tb;
226 u64 delta;
227 u64 seq;
228
229 curr = vcpu->arch.cur_activity;
230 vcpu->arch.cur_activity = next;
231 prev_tb = vcpu->arch.cur_tb_start;
232 vcpu->arch.cur_tb_start = tb;
233
234 if (!curr)
235 return;
236
237 delta = tb - prev_tb;
238
239 seq = curr->seqcount;
240 curr->seqcount = seq + 1;
241 smp_wmb();
242 curr->tb_total += delta;
243 if (seq == 0 || delta < curr->tb_min)
244 curr->tb_min = delta;
245 if (delta > curr->tb_max)
246 curr->tb_max = delta;
247 smp_wmb();
248 curr->seqcount = seq + 2;
249 }
250 EXPORT_SYMBOL_GPL(accumulate_time);
251 #endif
252
253 static inline u64 mfslbv(unsigned int idx)
254 {
255 u64 slbev;
256
257 asm volatile("slbmfev %0,%1" : "=r" (slbev) : "r" (idx));
258
259 return slbev;
260 }
261
262 static inline u64 mfslbe(unsigned int idx)
263 {
264 u64 slbee;
265
266 asm volatile("slbmfee %0,%1" : "=r" (slbee) : "r" (idx));
267
268 return slbee;
269 }
270
271 static inline void mtslb(u64 slbee, u64 slbev)
272 {
273 asm volatile("slbmte %0,%1" :: "r" (slbev), "r" (slbee));
274 }
275
276 static inline void clear_slb_entry(unsigned int idx)
277 {
278 mtslb(idx, 0);
279 }
280
281 static inline void slb_clear_invalidate_partition(void)
282 {
283 clear_slb_entry(0);
284 asm volatile(PPC_SLBIA(6));
285 }
286
287 /*
288 * Malicious or buggy radix guests may have inserted SLB entries
289 * (only 0..3 because radix always runs with UPRT=1), so these must
290 * be cleared here to avoid side-channels. slbmte is used rather
291 * than slbia, as it won't clear cached translations.
292 */
293 static void radix_clear_slb(void)
294 {
295 int i;
296
297 for (i = 0; i < 4; i++)
298 clear_slb_entry(i);
299 }
300
301 static void switch_mmu_to_guest_radix(struct kvm *kvm, struct kvm_vcpu *vcpu, u64 lpcr)
302 {
303 struct kvm_nested_guest *nested = vcpu->arch.nested;
304 u32 lpid;
305 u32 pid;
306
307 lpid = nested ? nested->shadow_lpid : kvm->arch.lpid;
308 pid = kvmppc_get_pid(vcpu);
309
310 /*
311 * Prior memory accesses to host PID Q3 must be completed before we
312 * start switching, and stores must be drained to avoid not-my-LPAR
313 * logic (see switch_mmu_to_host).
314 */
315 asm volatile("hwsync" ::: "memory");
316 isync();
317 mtspr(SPRN_LPID, lpid);
318 mtspr(SPRN_LPCR, lpcr);
319 mtspr(SPRN_PID, pid);
320 /*
321 * isync not required here because we are HRFID'ing to guest before
322 * any guest context access, which is context synchronising.
323 */
324 }
325
326 static void switch_mmu_to_guest_hpt(struct kvm *kvm, struct kvm_vcpu *vcpu, u64 lpcr)
327 {
328 u32 lpid;
329 u32 pid;
330 int i;
331
332 lpid = kvm->arch.lpid;
333 pid = kvmppc_get_pid(vcpu);
334
335 /*
336 * See switch_mmu_to_guest_radix. ptesync should not be required here
337 * even if the host is in HPT mode because speculative accesses would
338 * not cause RC updates (we are in real mode).
339 */
340 asm volatile("hwsync" ::: "memory");
341 isync();
342 mtspr(SPRN_LPID, lpid);
343 mtspr(SPRN_LPCR, lpcr);
344 mtspr(SPRN_PID, pid);
345
346 for (i = 0; i < vcpu->arch.slb_max; i++)
347 mtslb(vcpu->arch.slb[i].orige, vcpu->arch.slb[i].origv);
348 /*
349 * isync not required here, see switch_mmu_to_guest_radix.
350 */
351 }
352
353 static void switch_mmu_to_host(struct kvm *kvm, u32 pid)
354 {
355 u32 lpid = kvm->arch.host_lpid;
356 u64 lpcr = kvm->arch.host_lpcr;
357
358 /*
359 * The guest has exited, so guest MMU context is no longer being
360 * non-speculatively accessed, but a hwsync is needed before the
361 * mtLPIDR / mtPIDR switch, in order to ensure all stores are drained,
362 * so the not-my-LPAR tlbie logic does not overlook them.
363 */
364 asm volatile("hwsync" ::: "memory");
365 isync();
366 mtspr(SPRN_PID, pid);
367 mtspr(SPRN_LPID, lpid);
368 mtspr(SPRN_LPCR, lpcr);
369 /*
370 * isync is not required after the switch, because mtmsrd with L=0
371 * is performed after this switch, which is context synchronising.
372 */
373
374 if (!radix_enabled())
375 slb_restore_bolted_realmode();
376 }
377
378 static void save_clear_host_mmu(struct kvm *kvm)
379 {
380 if (!radix_enabled()) {
381 /*
382 * Hash host could save and restore host SLB entries to
383 * reduce SLB fault overheads of VM exits, but for now the
384 * existing code clears all entries and restores just the
385 * bolted ones when switching back to host.
386 */
387 slb_clear_invalidate_partition();
388 }
389 }
390
391 static void save_clear_guest_mmu(struct kvm *kvm, struct kvm_vcpu *vcpu)
392 {
393 if (kvm_is_radix(kvm)) {
394 radix_clear_slb();
395 } else {
396 int i;
397 int nr = 0;
398
399 /*
400 * This must run before switching to host (radix host can't
401 * access all SLBs).
402 */
403 for (i = 0; i < vcpu->arch.slb_nr; i++) {
404 u64 slbee, slbev;
405
406 slbee = mfslbe(i);
407 if (slbee & SLB_ESID_V) {
408 slbev = mfslbv(i);
409 vcpu->arch.slb[nr].orige = slbee | i;
410 vcpu->arch.slb[nr].origv = slbev;
411 nr++;
412 }
413 }
414 vcpu->arch.slb_max = nr;
415 slb_clear_invalidate_partition();
416 }
417 }
418
419 static void flush_guest_tlb(struct kvm *kvm)
420 {
421 unsigned long rb, set;
422
423 rb = PPC_BIT(52); /* IS = 2 */
424 if (kvm_is_radix(kvm)) {
425 /* R=1 PRS=1 RIC=2 */
426 asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
427 : : "r" (rb), "i" (1), "i" (1), "i" (2),
428 "r" (0) : "memory");
429 for (set = 1; set < kvm->arch.tlb_sets; ++set) {
430 rb += PPC_BIT(51); /* increment set number */
431 /* R=1 PRS=1 RIC=0 */
432 asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
433 : : "r" (rb), "i" (1), "i" (1), "i" (0),
434 "r" (0) : "memory");
435 }
436 asm volatile("ptesync": : :"memory");
437 // POWER9 congruence-class TLBIEL leaves ERAT. Flush it now.
438 asm volatile(PPC_RADIX_INVALIDATE_ERAT_GUEST : : :"memory");
439 } else {
440 for (set = 0; set < kvm->arch.tlb_sets; ++set) {
441 /* R=0 PRS=0 RIC=0 */
442 asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
443 : : "r" (rb), "i" (0), "i" (0), "i" (0),
444 "r" (0) : "memory");
445 rb += PPC_BIT(51); /* increment set number */
446 }
447 asm volatile("ptesync": : :"memory");
448 // POWER9 congruence-class TLBIEL leaves ERAT. Flush it now.
449 asm volatile(PPC_ISA_3_0_INVALIDATE_ERAT : : :"memory");
450 }
451 }
452
453 static void check_need_tlb_flush(struct kvm *kvm, int pcpu,
454 struct kvm_nested_guest *nested)
455 {
456 cpumask_t *need_tlb_flush;
457 bool all_set = true;
458 int i;
459
460 if (nested)
461 need_tlb_flush = &nested->need_tlb_flush;
462 else
463 need_tlb_flush = &kvm->arch.need_tlb_flush;
464
465 if (likely(!cpumask_test_cpu(pcpu, need_tlb_flush)))
466 return;
467
468 /*
469 * Individual threads can come in here, but the TLB is shared between
470 * the 4 threads in a core, hence invalidating on one thread
471 * invalidates for all, so only invalidate the first time (if all bits
472 * were set. The others must still execute a ptesync.
473 *
474 * If a race occurs and two threads do the TLB flush, that is not a
475 * problem, just sub-optimal.
476 */
477 for (i = cpu_first_tlb_thread_sibling(pcpu);
478 i <= cpu_last_tlb_thread_sibling(pcpu);
479 i += cpu_tlb_thread_sibling_step()) {
480 if (!cpumask_test_cpu(i, need_tlb_flush)) {
481 all_set = false;
482 break;
483 }
484 }
485 if (all_set)
486 flush_guest_tlb(kvm);
487 else
488 asm volatile("ptesync" ::: "memory");
489
490 /* Clear the bit after the TLB flush */
491 cpumask_clear_cpu(pcpu, need_tlb_flush);
492 }
493
494 unsigned long kvmppc_msr_hard_disable_set_facilities(struct kvm_vcpu *vcpu, unsigned long msr)
495 {
496 unsigned long msr_needed = 0;
497
498 msr &= ~MSR_EE;
499
500 /* MSR bits may have been cleared by context switch so must recheck */
501 if (IS_ENABLED(CONFIG_PPC_FPU))
502 msr_needed |= MSR_FP;
503 if (cpu_has_feature(CPU_FTR_ALTIVEC))
504 msr_needed |= MSR_VEC;
505 if (cpu_has_feature(CPU_FTR_VSX))
506 msr_needed |= MSR_VSX;
507 if ((cpu_has_feature(CPU_FTR_TM) ||
508 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) &&
509 (vcpu->arch.hfscr & HFSCR_TM))
510 msr_needed |= MSR_TM;
511
512 /*
513 * This could be combined with MSR[RI] clearing, but that expands
514 * the unrecoverable window. It would be better to cover unrecoverable
515 * with KVM bad interrupt handling rather than use MSR[RI] at all.
516 *
517 * Much more difficult and less worthwhile to combine with IR/DR
518 * disable.
519 */
520 if ((msr & msr_needed) != msr_needed) {
521 msr |= msr_needed;
522 __mtmsrd(msr, 0);
523 } else {
524 __hard_irq_disable();
525 }
526 local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
527
528 return msr;
529 }
530 EXPORT_SYMBOL_GPL(kvmppc_msr_hard_disable_set_facilities);
531
532 int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb)
533 {
534 struct p9_host_os_sprs host_os_sprs;
535 struct kvm *kvm = vcpu->kvm;
536 struct kvm_nested_guest *nested = vcpu->arch.nested;
537 struct kvmppc_vcore *vc = vcpu->arch.vcore;
538 s64 hdec, dec;
539 u64 purr, spurr;
540 u64 *exsave;
541 int trap;
542 unsigned long msr;
543 unsigned long host_hfscr;
544 unsigned long host_ciabr;
545 unsigned long host_dawr0;
546 unsigned long host_dawrx0;
547 unsigned long host_psscr;
548 unsigned long host_hpsscr;
549 unsigned long host_pidr;
550 unsigned long host_dawr1;
551 unsigned long host_dawrx1;
552 unsigned long dpdes;
553
554 hdec = time_limit - *tb;
555 if (hdec < 0)
556 return BOOK3S_INTERRUPT_HV_DECREMENTER;
557
558 WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_HV);
559 WARN_ON_ONCE(!(vcpu->arch.shregs.msr & MSR_ME));
560
561 vcpu->arch.ceded = 0;
562
563 /* Save MSR for restore, with EE clear. */
564 msr = mfmsr() & ~MSR_EE;
565
566 host_hfscr = mfspr(SPRN_HFSCR);
567 host_ciabr = mfspr(SPRN_CIABR);
568 host_psscr = mfspr(SPRN_PSSCR_PR);
569 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
570 host_hpsscr = mfspr(SPRN_PSSCR);
571 host_pidr = mfspr(SPRN_PID);
572
573 if (dawr_enabled()) {
574 host_dawr0 = mfspr(SPRN_DAWR0);
575 host_dawrx0 = mfspr(SPRN_DAWRX0);
576 if (cpu_has_feature(CPU_FTR_DAWR1)) {
577 host_dawr1 = mfspr(SPRN_DAWR1);
578 host_dawrx1 = mfspr(SPRN_DAWRX1);
579 }
580 }
581
582 local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR);
583 local_paca->kvm_hstate.host_spurr = mfspr(SPRN_SPURR);
584
585 save_p9_host_os_sprs(&host_os_sprs);
586
587 msr = kvmppc_msr_hard_disable_set_facilities(vcpu, msr);
588 if (lazy_irq_pending()) {
589 trap = 0;
590 goto out;
591 }
592
593 if (unlikely(load_vcpu_state(vcpu, &host_os_sprs)))
594 msr = mfmsr(); /* MSR may have been updated */
595
596 if (vc->tb_offset) {
597 u64 new_tb = *tb + vc->tb_offset;
598 mtspr(SPRN_TBU40, new_tb);
599 if ((mftb() & 0xffffff) < (new_tb & 0xffffff)) {
600 new_tb += 0x1000000;
601 mtspr(SPRN_TBU40, new_tb);
602 }
603 *tb = new_tb;
604 vc->tb_offset_applied = vc->tb_offset;
605 }
606
607 mtspr(SPRN_VTB, vc->vtb);
608 mtspr(SPRN_PURR, vcpu->arch.purr);
609 mtspr(SPRN_SPURR, vcpu->arch.spurr);
610
611 if (vc->pcr)
612 mtspr(SPRN_PCR, vc->pcr | PCR_MASK);
613 if (vcpu->arch.doorbell_request) {
614 vcpu->arch.doorbell_request = 0;
615 mtspr(SPRN_DPDES, 1);
616 }
617
618 if (dawr_enabled()) {
619 if (vcpu->arch.dawr0 != host_dawr0)
620 mtspr(SPRN_DAWR0, vcpu->arch.dawr0);
621 if (vcpu->arch.dawrx0 != host_dawrx0)
622 mtspr(SPRN_DAWRX0, vcpu->arch.dawrx0);
623 if (cpu_has_feature(CPU_FTR_DAWR1)) {
624 if (vcpu->arch.dawr1 != host_dawr1)
625 mtspr(SPRN_DAWR1, vcpu->arch.dawr1);
626 if (vcpu->arch.dawrx1 != host_dawrx1)
627 mtspr(SPRN_DAWRX1, vcpu->arch.dawrx1);
628 }
629 }
630 if (vcpu->arch.ciabr != host_ciabr)
631 mtspr(SPRN_CIABR, vcpu->arch.ciabr);
632
633
634 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) {
635 mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC |
636 (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
637 } else {
638 if (vcpu->arch.psscr != host_psscr)
639 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr);
640 }
641
642 mtspr(SPRN_HFSCR, vcpu->arch.hfscr);
643
644 mtspr(SPRN_HSRR0, vcpu->arch.regs.nip);
645 mtspr(SPRN_HSRR1, (vcpu->arch.shregs.msr & ~MSR_HV) | MSR_ME);
646
647 /*
648 * On POWER9 DD2.1 and below, sometimes on a Hypervisor Data Storage
649 * Interrupt (HDSI) the HDSISR is not be updated at all.
650 *
651 * To work around this we put a canary value into the HDSISR before
652 * returning to a guest and then check for this canary when we take a
653 * HDSI. If we find the canary on a HDSI, we know the hardware didn't
654 * update the HDSISR. In this case we return to the guest to retake the
655 * HDSI which should correctly update the HDSISR the second time HDSI
656 * entry.
657 *
658 * The "radix prefetch bug" test can be used to test for this bug, as
659 * it also exists fo DD2.1 and below.
660 */
661 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG))
662 mtspr(SPRN_HDSISR, HDSISR_CANARY);
663
664 mtspr(SPRN_SPRG0, vcpu->arch.shregs.sprg0);
665 mtspr(SPRN_SPRG1, vcpu->arch.shregs.sprg1);
666 mtspr(SPRN_SPRG2, vcpu->arch.shregs.sprg2);
667 mtspr(SPRN_SPRG3, vcpu->arch.shregs.sprg3);
668
669 /*
670 * It might be preferable to load_vcpu_state here, in order to get the
671 * GPR/FP register loads executing in parallel with the previous mtSPR
672 * instructions, but for now that can't be done because the TM handling
673 * in load_vcpu_state can change some SPRs and vcpu state (nip, msr).
674 * But TM could be split out if this would be a significant benefit.
675 */
676
677 /*
678 * MSR[RI] does not need to be cleared (and is not, for radix guests
679 * with no prefetch bug), because in_guest is set. If we take a SRESET
680 * or MCE with in_guest set but still in HV mode, then
681 * kvmppc_p9_bad_interrupt handles the interrupt, which effectively
682 * clears MSR[RI] and doesn't return.
683 */
684 WRITE_ONCE(local_paca->kvm_hstate.in_guest, KVM_GUEST_MODE_HV_P9);
685 barrier(); /* Open in_guest critical section */
686
687 /*
688 * Hash host, hash guest, or radix guest with prefetch bug, all have
689 * to disable the MMU before switching to guest MMU state.
690 */
691 if (!radix_enabled() || !kvm_is_radix(kvm) ||
692 cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG))
693 __mtmsrd(msr & ~(MSR_IR|MSR_DR|MSR_RI), 0);
694
695 save_clear_host_mmu(kvm);
696
697 if (kvm_is_radix(kvm))
698 switch_mmu_to_guest_radix(kvm, vcpu, lpcr);
699 else
700 switch_mmu_to_guest_hpt(kvm, vcpu, lpcr);
701
702 /* TLBIEL uses LPID=LPIDR, so run this after setting guest LPID */
703 check_need_tlb_flush(kvm, vc->pcpu, nested);
704
705 /*
706 * P9 suppresses the HDEC exception when LPCR[HDICE] = 0,
707 * so set guest LPCR (with HDICE) before writing HDEC.
708 */
709 mtspr(SPRN_HDEC, hdec);
710
711 mtspr(SPRN_DEC, vcpu->arch.dec_expires - *tb);
712
713 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
714 tm_return_to_guest:
715 #endif
716 mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
717 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
718 mtspr(SPRN_SRR0, vcpu->arch.shregs.srr0);
719 mtspr(SPRN_SRR1, vcpu->arch.shregs.srr1);
720
721 switch_pmu_to_guest(vcpu, &host_os_sprs);
722 accumulate_time(vcpu, &vcpu->arch.in_guest);
723
724 kvmppc_p9_enter_guest(vcpu);
725
726 accumulate_time(vcpu, &vcpu->arch.guest_exit);
727 switch_pmu_to_host(vcpu, &host_os_sprs);
728
729 /* XXX: Could get these from r11/12 and paca exsave instead */
730 vcpu->arch.shregs.srr0 = mfspr(SPRN_SRR0);
731 vcpu->arch.shregs.srr1 = mfspr(SPRN_SRR1);
732 vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
733 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
734
735 /* 0x2 bit for HSRR is only used by PR and P7/8 HV paths, clear it */
736 trap = local_paca->kvm_hstate.scratch0 & ~0x2;
737
738 if (likely(trap > BOOK3S_INTERRUPT_MACHINE_CHECK))
739 exsave = local_paca->exgen;
740 else if (trap == BOOK3S_INTERRUPT_SYSTEM_RESET)
741 exsave = local_paca->exnmi;
742 else /* trap == 0x200 */
743 exsave = local_paca->exmc;
744
745 vcpu->arch.regs.gpr[1] = local_paca->kvm_hstate.scratch1;
746 vcpu->arch.regs.gpr[3] = local_paca->kvm_hstate.scratch2;
747
748 /*
749 * After reading machine check regs (DAR, DSISR, SRR0/1) and hstate
750 * scratch (which we need to move into exsave to make re-entrant vs
751 * SRESET/MCE), register state is protected from reentrancy. However
752 * timebase, MMU, among other state is still set to guest, so don't
753 * enable MSR[RI] here. It gets enabled at the end, after in_guest
754 * is cleared.
755 *
756 * It is possible an NMI could come in here, which is why it is
757 * important to save the above state early so it can be debugged.
758 */
759
760 vcpu->arch.regs.gpr[9] = exsave[EX_R9/sizeof(u64)];
761 vcpu->arch.regs.gpr[10] = exsave[EX_R10/sizeof(u64)];
762 vcpu->arch.regs.gpr[11] = exsave[EX_R11/sizeof(u64)];
763 vcpu->arch.regs.gpr[12] = exsave[EX_R12/sizeof(u64)];
764 vcpu->arch.regs.gpr[13] = exsave[EX_R13/sizeof(u64)];
765 vcpu->arch.ppr = exsave[EX_PPR/sizeof(u64)];
766 vcpu->arch.cfar = exsave[EX_CFAR/sizeof(u64)];
767 vcpu->arch.regs.ctr = exsave[EX_CTR/sizeof(u64)];
768
769 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
770
771 if (unlikely(trap == BOOK3S_INTERRUPT_MACHINE_CHECK)) {
772 vcpu->arch.fault_dar = exsave[EX_DAR/sizeof(u64)];
773 vcpu->arch.fault_dsisr = exsave[EX_DSISR/sizeof(u64)];
774 kvmppc_realmode_machine_check(vcpu);
775
776 } else if (unlikely(trap == BOOK3S_INTERRUPT_HMI)) {
777 kvmppc_p9_realmode_hmi_handler(vcpu);
778
779 } else if (trap == BOOK3S_INTERRUPT_H_EMUL_ASSIST) {
780 vcpu->arch.emul_inst = mfspr(SPRN_HEIR);
781
782 } else if (trap == BOOK3S_INTERRUPT_H_DATA_STORAGE) {
783 vcpu->arch.fault_dar = exsave[EX_DAR/sizeof(u64)];
784 vcpu->arch.fault_dsisr = exsave[EX_DSISR/sizeof(u64)];
785 vcpu->arch.fault_gpa = mfspr(SPRN_ASDR);
786
787 } else if (trap == BOOK3S_INTERRUPT_H_INST_STORAGE) {
788 vcpu->arch.fault_gpa = mfspr(SPRN_ASDR);
789
790 } else if (trap == BOOK3S_INTERRUPT_H_FAC_UNAVAIL) {
791 vcpu->arch.hfscr = mfspr(SPRN_HFSCR);
792
793 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
794 /*
795 * Softpatch interrupt for transactional memory emulation cases
796 * on POWER9 DD2.2. This is early in the guest exit path - we
797 * haven't saved registers or done a treclaim yet.
798 */
799 } else if (trap == BOOK3S_INTERRUPT_HV_SOFTPATCH) {
800 vcpu->arch.emul_inst = mfspr(SPRN_HEIR);
801
802 /*
803 * The cases we want to handle here are those where the guest
804 * is in real suspend mode and is trying to transition to
805 * transactional mode.
806 */
807 if (!local_paca->kvm_hstate.fake_suspend &&
808 (vcpu->arch.shregs.msr & MSR_TS_S)) {
809 if (kvmhv_p9_tm_emulation_early(vcpu)) {
810 /*
811 * Go straight back into the guest with the
812 * new NIP/MSR as set by TM emulation.
813 */
814 mtspr(SPRN_HSRR0, vcpu->arch.regs.nip);
815 mtspr(SPRN_HSRR1, vcpu->arch.shregs.msr);
816 goto tm_return_to_guest;
817 }
818 }
819 #endif
820 }
821
822 /* Advance host PURR/SPURR by the amount used by guest */
823 purr = mfspr(SPRN_PURR);
824 spurr = mfspr(SPRN_SPURR);
825 local_paca->kvm_hstate.host_purr += purr - vcpu->arch.purr;
826 local_paca->kvm_hstate.host_spurr += spurr - vcpu->arch.spurr;
827 vcpu->arch.purr = purr;
828 vcpu->arch.spurr = spurr;
829
830 vcpu->arch.ic = mfspr(SPRN_IC);
831 vcpu->arch.pid = mfspr(SPRN_PID);
832 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR);
833
834 vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0);
835 vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1);
836 vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2);
837 vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3);
838
839 dpdes = mfspr(SPRN_DPDES);
840 if (dpdes)
841 vcpu->arch.doorbell_request = 1;
842
843 vc->vtb = mfspr(SPRN_VTB);
844
845 dec = mfspr(SPRN_DEC);
846 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */
847 dec = (s32) dec;
848 *tb = mftb();
849 vcpu->arch.dec_expires = dec + *tb;
850
851 if (vc->tb_offset_applied) {
852 u64 new_tb = *tb - vc->tb_offset_applied;
853 mtspr(SPRN_TBU40, new_tb);
854 if ((mftb() & 0xffffff) < (new_tb & 0xffffff)) {
855 new_tb += 0x1000000;
856 mtspr(SPRN_TBU40, new_tb);
857 }
858 *tb = new_tb;
859 vc->tb_offset_applied = 0;
860 }
861
862 save_clear_guest_mmu(kvm, vcpu);
863 switch_mmu_to_host(kvm, host_pidr);
864
865 /*
866 * Enable MSR here in order to have facilities enabled to save
867 * guest registers. This enables MMU (if we were in realmode), so
868 * only switch MMU on after the MMU is switched to host, to avoid
869 * the P9_RADIX_PREFETCH_BUG or hash guest context.
870 */
871 if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
872 vcpu->arch.shregs.msr & MSR_TS_MASK)
873 msr |= MSR_TS_S;
874 __mtmsrd(msr, 0);
875
876 store_vcpu_state(vcpu);
877
878 mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr);
879 mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr);
880
881 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) {
882 /* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */
883 mtspr(SPRN_PSSCR, host_hpsscr |
884 (local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
885 }
886
887 mtspr(SPRN_HFSCR, host_hfscr);
888 if (vcpu->arch.ciabr != host_ciabr)
889 mtspr(SPRN_CIABR, host_ciabr);
890
891 if (dawr_enabled()) {
892 if (vcpu->arch.dawr0 != host_dawr0)
893 mtspr(SPRN_DAWR0, host_dawr0);
894 if (vcpu->arch.dawrx0 != host_dawrx0)
895 mtspr(SPRN_DAWRX0, host_dawrx0);
896 if (cpu_has_feature(CPU_FTR_DAWR1)) {
897 if (vcpu->arch.dawr1 != host_dawr1)
898 mtspr(SPRN_DAWR1, host_dawr1);
899 if (vcpu->arch.dawrx1 != host_dawrx1)
900 mtspr(SPRN_DAWRX1, host_dawrx1);
901 }
902 }
903
904 if (dpdes)
905 mtspr(SPRN_DPDES, 0);
906 if (vc->pcr)
907 mtspr(SPRN_PCR, PCR_MASK);
908
909 /* HDEC must be at least as large as DEC, so decrementer_max fits */
910 mtspr(SPRN_HDEC, decrementer_max);
911
912 timer_rearm_host_dec(*tb);
913
914 restore_p9_host_os_sprs(vcpu, &host_os_sprs);
915
916 barrier(); /* Close in_guest critical section */
917 WRITE_ONCE(local_paca->kvm_hstate.in_guest, KVM_GUEST_MODE_NONE);
918 /* Interrupts are recoverable at this point */
919
920 /*
921 * cp_abort is required if the processor supports local copy-paste
922 * to clear the copy buffer that was under control of the guest.
923 */
924 if (cpu_has_feature(CPU_FTR_ARCH_31))
925 asm volatile(PPC_CP_ABORT);
926
927 out:
928 return trap;
929 }
930 EXPORT_SYMBOL_GPL(kvmhv_vcpu_entry_p9);
931
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