xref: /openbmc/linux/arch/powerpc/kvm/book3s_64_mmu.c (revision 4f205687)
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License, version 2, as
4  * published by the Free Software Foundation.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program; if not, write to the Free Software
13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
14  *
15  * Copyright SUSE Linux Products GmbH 2009
16  *
17  * Authors: Alexander Graf <agraf@suse.de>
18  */
19 
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kvm.h>
23 #include <linux/kvm_host.h>
24 #include <linux/highmem.h>
25 
26 #include <asm/tlbflush.h>
27 #include <asm/kvm_ppc.h>
28 #include <asm/kvm_book3s.h>
29 #include <asm/book3s/64/mmu-hash.h>
30 
31 /* #define DEBUG_MMU */
32 
33 #ifdef DEBUG_MMU
34 #define dprintk(X...) printk(KERN_INFO X)
35 #else
36 #define dprintk(X...) do { } while(0)
37 #endif
38 
39 static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
40 {
41 	kvmppc_set_msr(vcpu, vcpu->arch.intr_msr);
42 }
43 
44 static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
45 				struct kvm_vcpu *vcpu,
46 				gva_t eaddr)
47 {
48 	int i;
49 	u64 esid = GET_ESID(eaddr);
50 	u64 esid_1t = GET_ESID_1T(eaddr);
51 
52 	for (i = 0; i < vcpu->arch.slb_nr; i++) {
53 		u64 cmp_esid = esid;
54 
55 		if (!vcpu->arch.slb[i].valid)
56 			continue;
57 
58 		if (vcpu->arch.slb[i].tb)
59 			cmp_esid = esid_1t;
60 
61 		if (vcpu->arch.slb[i].esid == cmp_esid)
62 			return &vcpu->arch.slb[i];
63 	}
64 
65 	dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n",
66 		eaddr, esid, esid_1t);
67 	for (i = 0; i < vcpu->arch.slb_nr; i++) {
68 	    if (vcpu->arch.slb[i].vsid)
69 		dprintk("  %d: %c%c%c %llx %llx\n", i,
70 			vcpu->arch.slb[i].valid ? 'v' : ' ',
71 			vcpu->arch.slb[i].large ? 'l' : ' ',
72 			vcpu->arch.slb[i].tb    ? 't' : ' ',
73 			vcpu->arch.slb[i].esid,
74 			vcpu->arch.slb[i].vsid);
75 	}
76 
77 	return NULL;
78 }
79 
80 static int kvmppc_slb_sid_shift(struct kvmppc_slb *slbe)
81 {
82 	return slbe->tb ? SID_SHIFT_1T : SID_SHIFT;
83 }
84 
85 static u64 kvmppc_slb_offset_mask(struct kvmppc_slb *slbe)
86 {
87 	return (1ul << kvmppc_slb_sid_shift(slbe)) - 1;
88 }
89 
90 static u64 kvmppc_slb_calc_vpn(struct kvmppc_slb *slb, gva_t eaddr)
91 {
92 	eaddr &= kvmppc_slb_offset_mask(slb);
93 
94 	return (eaddr >> VPN_SHIFT) |
95 		((slb->vsid) << (kvmppc_slb_sid_shift(slb) - VPN_SHIFT));
96 }
97 
98 static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
99 					 bool data)
100 {
101 	struct kvmppc_slb *slb;
102 
103 	slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, eaddr);
104 	if (!slb)
105 		return 0;
106 
107 	return kvmppc_slb_calc_vpn(slb, eaddr);
108 }
109 
110 static int mmu_pagesize(int mmu_pg)
111 {
112 	switch (mmu_pg) {
113 	case MMU_PAGE_64K:
114 		return 16;
115 	case MMU_PAGE_16M:
116 		return 24;
117 	}
118 	return 12;
119 }
120 
121 static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
122 {
123 	return mmu_pagesize(slbe->base_page_size);
124 }
125 
126 static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
127 {
128 	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
129 
130 	return ((eaddr & kvmppc_slb_offset_mask(slbe)) >> p);
131 }
132 
133 static hva_t kvmppc_mmu_book3s_64_get_pteg(struct kvm_vcpu *vcpu,
134 				struct kvmppc_slb *slbe, gva_t eaddr,
135 				bool second)
136 {
137 	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
138 	u64 hash, pteg, htabsize;
139 	u32 ssize;
140 	hva_t r;
141 	u64 vpn;
142 
143 	htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);
144 
145 	vpn = kvmppc_slb_calc_vpn(slbe, eaddr);
146 	ssize = slbe->tb ? MMU_SEGSIZE_1T : MMU_SEGSIZE_256M;
147 	hash = hpt_hash(vpn, kvmppc_mmu_book3s_64_get_pagesize(slbe), ssize);
148 	if (second)
149 		hash = ~hash;
150 	hash &= ((1ULL << 39ULL) - 1ULL);
151 	hash &= htabsize;
152 	hash <<= 7ULL;
153 
154 	pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
155 	pteg |= hash;
156 
157 	dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",
158 		page, vcpu_book3s->sdr1, pteg, slbe->vsid);
159 
160 	/* When running a PAPR guest, SDR1 contains a HVA address instead
161            of a GPA */
162 	if (vcpu->arch.papr_enabled)
163 		r = pteg;
164 	else
165 		r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
166 
167 	if (kvm_is_error_hva(r))
168 		return r;
169 	return r | (pteg & ~PAGE_MASK);
170 }
171 
172 static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
173 {
174 	int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
175 	u64 avpn;
176 
177 	avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
178 	avpn |= slbe->vsid << (kvmppc_slb_sid_shift(slbe) - p);
179 
180 	if (p < 16)
181 		avpn >>= ((80 - p) - 56) - 8;	/* 16 - p */
182 	else
183 		avpn <<= p - 16;
184 
185 	return avpn;
186 }
187 
188 /*
189  * Return page size encoded in the second word of a HPTE, or
190  * -1 for an invalid encoding for the base page size indicated by
191  * the SLB entry.  This doesn't handle mixed pagesize segments yet.
192  */
193 static int decode_pagesize(struct kvmppc_slb *slbe, u64 r)
194 {
195 	switch (slbe->base_page_size) {
196 	case MMU_PAGE_64K:
197 		if ((r & 0xf000) == 0x1000)
198 			return MMU_PAGE_64K;
199 		break;
200 	case MMU_PAGE_16M:
201 		if ((r & 0xff000) == 0)
202 			return MMU_PAGE_16M;
203 		break;
204 	}
205 	return -1;
206 }
207 
208 static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
209 				      struct kvmppc_pte *gpte, bool data,
210 				      bool iswrite)
211 {
212 	struct kvmppc_slb *slbe;
213 	hva_t ptegp;
214 	u64 pteg[16];
215 	u64 avpn = 0;
216 	u64 v, r;
217 	u64 v_val, v_mask;
218 	u64 eaddr_mask;
219 	int i;
220 	u8 pp, key = 0;
221 	bool found = false;
222 	bool second = false;
223 	int pgsize;
224 	ulong mp_ea = vcpu->arch.magic_page_ea;
225 
226 	/* Magic page override */
227 	if (unlikely(mp_ea) &&
228 	    unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
229 	    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
230 		gpte->eaddr = eaddr;
231 		gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
232 		gpte->raddr = vcpu->arch.magic_page_pa | (gpte->raddr & 0xfff);
233 		gpte->raddr &= KVM_PAM;
234 		gpte->may_execute = true;
235 		gpte->may_read = true;
236 		gpte->may_write = true;
237 		gpte->page_size = MMU_PAGE_4K;
238 
239 		return 0;
240 	}
241 
242 	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, eaddr);
243 	if (!slbe)
244 		goto no_seg_found;
245 
246 	avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);
247 	v_val = avpn & HPTE_V_AVPN;
248 
249 	if (slbe->tb)
250 		v_val |= SLB_VSID_B_1T;
251 	if (slbe->large)
252 		v_val |= HPTE_V_LARGE;
253 	v_val |= HPTE_V_VALID;
254 
255 	v_mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_LARGE | HPTE_V_VALID |
256 		HPTE_V_SECONDARY;
257 
258 	pgsize = slbe->large ? MMU_PAGE_16M : MMU_PAGE_4K;
259 
260 	mutex_lock(&vcpu->kvm->arch.hpt_mutex);
261 
262 do_second:
263 	ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu, slbe, eaddr, second);
264 	if (kvm_is_error_hva(ptegp))
265 		goto no_page_found;
266 
267 	if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
268 		printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);
269 		goto no_page_found;
270 	}
271 
272 	if ((kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Kp)
273 		key = 4;
274 	else if (!(kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Ks)
275 		key = 4;
276 
277 	for (i=0; i<16; i+=2) {
278 		u64 pte0 = be64_to_cpu(pteg[i]);
279 		u64 pte1 = be64_to_cpu(pteg[i + 1]);
280 
281 		/* Check all relevant fields of 1st dword */
282 		if ((pte0 & v_mask) == v_val) {
283 			/* If large page bit is set, check pgsize encoding */
284 			if (slbe->large &&
285 			    (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
286 				pgsize = decode_pagesize(slbe, pte1);
287 				if (pgsize < 0)
288 					continue;
289 			}
290 			found = true;
291 			break;
292 		}
293 	}
294 
295 	if (!found) {
296 		if (second)
297 			goto no_page_found;
298 		v_val |= HPTE_V_SECONDARY;
299 		second = true;
300 		goto do_second;
301 	}
302 
303 	v = be64_to_cpu(pteg[i]);
304 	r = be64_to_cpu(pteg[i+1]);
305 	pp = (r & HPTE_R_PP) | key;
306 	if (r & HPTE_R_PP0)
307 		pp |= 8;
308 
309 	gpte->eaddr = eaddr;
310 	gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
311 
312 	eaddr_mask = (1ull << mmu_pagesize(pgsize)) - 1;
313 	gpte->raddr = (r & HPTE_R_RPN & ~eaddr_mask) | (eaddr & eaddr_mask);
314 	gpte->page_size = pgsize;
315 	gpte->may_execute = ((r & HPTE_R_N) ? false : true);
316 	if (unlikely(vcpu->arch.disable_kernel_nx) &&
317 	    !(kvmppc_get_msr(vcpu) & MSR_PR))
318 		gpte->may_execute = true;
319 	gpte->may_read = false;
320 	gpte->may_write = false;
321 
322 	switch (pp) {
323 	case 0:
324 	case 1:
325 	case 2:
326 	case 6:
327 		gpte->may_write = true;
328 		/* fall through */
329 	case 3:
330 	case 5:
331 	case 7:
332 	case 10:
333 		gpte->may_read = true;
334 		break;
335 	}
336 
337 	dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
338 		"-> 0x%lx\n",
339 		eaddr, avpn, gpte->vpage, gpte->raddr);
340 
341 	/* Update PTE R and C bits, so the guest's swapper knows we used the
342 	 * page */
343 	if (gpte->may_read && !(r & HPTE_R_R)) {
344 		/*
345 		 * Set the accessed flag.
346 		 * We have to write this back with a single byte write
347 		 * because another vcpu may be accessing this on
348 		 * non-PAPR platforms such as mac99, and this is
349 		 * what real hardware does.
350 		 */
351                 char __user *addr = (char __user *) (ptegp + (i + 1) * sizeof(u64));
352 		r |= HPTE_R_R;
353 		put_user(r >> 8, addr + 6);
354 	}
355 	if (iswrite && gpte->may_write && !(r & HPTE_R_C)) {
356 		/* Set the dirty flag */
357 		/* Use a single byte write */
358                 char __user *addr = (char __user *) (ptegp + (i + 1) * sizeof(u64));
359 		r |= HPTE_R_C;
360 		put_user(r, addr + 7);
361 	}
362 
363 	mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
364 
365 	if (!gpte->may_read || (iswrite && !gpte->may_write))
366 		return -EPERM;
367 	return 0;
368 
369 no_page_found:
370 	mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
371 	return -ENOENT;
372 
373 no_seg_found:
374 	dprintk("KVM MMU: Trigger segment fault\n");
375 	return -EINVAL;
376 }
377 
378 static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
379 {
380 	u64 esid, esid_1t;
381 	int slb_nr;
382 	struct kvmppc_slb *slbe;
383 
384 	dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);
385 
386 	esid = GET_ESID(rb);
387 	esid_1t = GET_ESID_1T(rb);
388 	slb_nr = rb & 0xfff;
389 
390 	if (slb_nr > vcpu->arch.slb_nr)
391 		return;
392 
393 	slbe = &vcpu->arch.slb[slb_nr];
394 
395 	slbe->large = (rs & SLB_VSID_L) ? 1 : 0;
396 	slbe->tb    = (rs & SLB_VSID_B_1T) ? 1 : 0;
397 	slbe->esid  = slbe->tb ? esid_1t : esid;
398 	slbe->vsid  = (rs & ~SLB_VSID_B) >> (kvmppc_slb_sid_shift(slbe) - 16);
399 	slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;
400 	slbe->Ks    = (rs & SLB_VSID_KS) ? 1 : 0;
401 	slbe->Kp    = (rs & SLB_VSID_KP) ? 1 : 0;
402 	slbe->nx    = (rs & SLB_VSID_N) ? 1 : 0;
403 	slbe->class = (rs & SLB_VSID_C) ? 1 : 0;
404 
405 	slbe->base_page_size = MMU_PAGE_4K;
406 	if (slbe->large) {
407 		if (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE) {
408 			switch (rs & SLB_VSID_LP) {
409 			case SLB_VSID_LP_00:
410 				slbe->base_page_size = MMU_PAGE_16M;
411 				break;
412 			case SLB_VSID_LP_01:
413 				slbe->base_page_size = MMU_PAGE_64K;
414 				break;
415 			}
416 		} else
417 			slbe->base_page_size = MMU_PAGE_16M;
418 	}
419 
420 	slbe->orige = rb & (ESID_MASK | SLB_ESID_V);
421 	slbe->origv = rs;
422 
423 	/* Map the new segment */
424 	kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);
425 }
426 
427 static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)
428 {
429 	struct kvmppc_slb *slbe;
430 
431 	if (slb_nr > vcpu->arch.slb_nr)
432 		return 0;
433 
434 	slbe = &vcpu->arch.slb[slb_nr];
435 
436 	return slbe->orige;
437 }
438 
439 static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)
440 {
441 	struct kvmppc_slb *slbe;
442 
443 	if (slb_nr > vcpu->arch.slb_nr)
444 		return 0;
445 
446 	slbe = &vcpu->arch.slb[slb_nr];
447 
448 	return slbe->origv;
449 }
450 
451 static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)
452 {
453 	struct kvmppc_slb *slbe;
454 	u64 seg_size;
455 
456 	dprintk("KVM MMU: slbie(0x%llx)\n", ea);
457 
458 	slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea);
459 
460 	if (!slbe)
461 		return;
462 
463 	dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);
464 
465 	slbe->valid = false;
466 	slbe->orige = 0;
467 	slbe->origv = 0;
468 
469 	seg_size = 1ull << kvmppc_slb_sid_shift(slbe);
470 	kvmppc_mmu_flush_segment(vcpu, ea & ~(seg_size - 1), seg_size);
471 }
472 
473 static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
474 {
475 	int i;
476 
477 	dprintk("KVM MMU: slbia()\n");
478 
479 	for (i = 1; i < vcpu->arch.slb_nr; i++) {
480 		vcpu->arch.slb[i].valid = false;
481 		vcpu->arch.slb[i].orige = 0;
482 		vcpu->arch.slb[i].origv = 0;
483 	}
484 
485 	if (kvmppc_get_msr(vcpu) & MSR_IR) {
486 		kvmppc_mmu_flush_segments(vcpu);
487 		kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
488 	}
489 }
490 
491 static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
492 					ulong value)
493 {
494 	u64 rb = 0, rs = 0;
495 
496 	/*
497 	 * According to Book3 2.01 mtsrin is implemented as:
498 	 *
499 	 * The SLB entry specified by (RB)32:35 is loaded from register
500 	 * RS, as follows.
501 	 *
502 	 * SLBE Bit	Source			SLB Field
503 	 *
504 	 * 0:31		0x0000_0000		ESID-0:31
505 	 * 32:35	(RB)32:35		ESID-32:35
506 	 * 36		0b1			V
507 	 * 37:61	0x00_0000|| 0b0		VSID-0:24
508 	 * 62:88	(RS)37:63		VSID-25:51
509 	 * 89:91	(RS)33:35		Ks Kp N
510 	 * 92		(RS)36			L ((RS)36 must be 0b0)
511 	 * 93		0b0			C
512 	 */
513 
514 	dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value);
515 
516 	/* ESID = srnum */
517 	rb |= (srnum & 0xf) << 28;
518 	/* Set the valid bit */
519 	rb |= 1 << 27;
520 	/* Index = ESID */
521 	rb |= srnum;
522 
523 	/* VSID = VSID */
524 	rs |= (value & 0xfffffff) << 12;
525 	/* flags = flags */
526 	rs |= ((value >> 28) & 0x7) << 9;
527 
528 	kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
529 }
530 
531 static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
532 				       bool large)
533 {
534 	u64 mask = 0xFFFFFFFFFULL;
535 	long i;
536 	struct kvm_vcpu *v;
537 
538 	dprintk("KVM MMU: tlbie(0x%lx)\n", va);
539 
540 	/*
541 	 * The tlbie instruction changed behaviour starting with
542 	 * POWER6.  POWER6 and later don't have the large page flag
543 	 * in the instruction but in the RB value, along with bits
544 	 * indicating page and segment sizes.
545 	 */
546 	if (vcpu->arch.hflags & BOOK3S_HFLAG_NEW_TLBIE) {
547 		/* POWER6 or later */
548 		if (va & 1) {		/* L bit */
549 			if ((va & 0xf000) == 0x1000)
550 				mask = 0xFFFFFFFF0ULL;	/* 64k page */
551 			else
552 				mask = 0xFFFFFF000ULL;	/* 16M page */
553 		}
554 	} else {
555 		/* older processors, e.g. PPC970 */
556 		if (large)
557 			mask = 0xFFFFFF000ULL;
558 	}
559 	/* flush this VA on all vcpus */
560 	kvm_for_each_vcpu(i, v, vcpu->kvm)
561 		kvmppc_mmu_pte_vflush(v, va >> 12, mask);
562 }
563 
564 #ifdef CONFIG_PPC_64K_PAGES
565 static int segment_contains_magic_page(struct kvm_vcpu *vcpu, ulong esid)
566 {
567 	ulong mp_ea = vcpu->arch.magic_page_ea;
568 
569 	return mp_ea && !(kvmppc_get_msr(vcpu) & MSR_PR) &&
570 		(mp_ea >> SID_SHIFT) == esid;
571 }
572 #endif
573 
574 static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
575 					     u64 *vsid)
576 {
577 	ulong ea = esid << SID_SHIFT;
578 	struct kvmppc_slb *slb;
579 	u64 gvsid = esid;
580 	ulong mp_ea = vcpu->arch.magic_page_ea;
581 	int pagesize = MMU_PAGE_64K;
582 	u64 msr = kvmppc_get_msr(vcpu);
583 
584 	if (msr & (MSR_DR|MSR_IR)) {
585 		slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea);
586 		if (slb) {
587 			gvsid = slb->vsid;
588 			pagesize = slb->base_page_size;
589 			if (slb->tb) {
590 				gvsid <<= SID_SHIFT_1T - SID_SHIFT;
591 				gvsid |= esid & ((1ul << (SID_SHIFT_1T - SID_SHIFT)) - 1);
592 				gvsid |= VSID_1T;
593 			}
594 		}
595 	}
596 
597 	switch (msr & (MSR_DR|MSR_IR)) {
598 	case 0:
599 		gvsid = VSID_REAL | esid;
600 		break;
601 	case MSR_IR:
602 		gvsid |= VSID_REAL_IR;
603 		break;
604 	case MSR_DR:
605 		gvsid |= VSID_REAL_DR;
606 		break;
607 	case MSR_DR|MSR_IR:
608 		if (!slb)
609 			goto no_slb;
610 
611 		break;
612 	default:
613 		BUG();
614 		break;
615 	}
616 
617 #ifdef CONFIG_PPC_64K_PAGES
618 	/*
619 	 * Mark this as a 64k segment if the host is using
620 	 * 64k pages, the host MMU supports 64k pages and
621 	 * the guest segment page size is >= 64k,
622 	 * but not if this segment contains the magic page.
623 	 */
624 	if (pagesize >= MMU_PAGE_64K &&
625 	    mmu_psize_defs[MMU_PAGE_64K].shift &&
626 	    !segment_contains_magic_page(vcpu, esid))
627 		gvsid |= VSID_64K;
628 #endif
629 
630 	if (kvmppc_get_msr(vcpu) & MSR_PR)
631 		gvsid |= VSID_PR;
632 
633 	*vsid = gvsid;
634 	return 0;
635 
636 no_slb:
637 	/* Catch magic page case */
638 	if (unlikely(mp_ea) &&
639 	    unlikely(esid == (mp_ea >> SID_SHIFT)) &&
640 	    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
641 		*vsid = VSID_REAL | esid;
642 		return 0;
643 	}
644 
645 	return -EINVAL;
646 }
647 
648 static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
649 {
650 	return (to_book3s(vcpu)->hid[5] & 0x80);
651 }
652 
653 void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)
654 {
655 	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
656 
657 	mmu->mfsrin = NULL;
658 	mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;
659 	mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;
660 	mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;
661 	mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;
662 	mmu->slbie = kvmppc_mmu_book3s_64_slbie;
663 	mmu->slbia = kvmppc_mmu_book3s_64_slbia;
664 	mmu->xlate = kvmppc_mmu_book3s_64_xlate;
665 	mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;
666 	mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;
667 	mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;
668 	mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;
669 	mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;
670 
671 	vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
672 }
673