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1 /*
2  * Copyright (C) 2008-2013 Freescale Semiconductor, Inc. All rights reserved.
3  *
4  * Author: Yu Liu, yu.liu@freescale.com
5  *         Scott Wood, scottwood@freescale.com
6  *         Ashish Kalra, ashish.kalra@freescale.com
7  *         Varun Sethi, varun.sethi@freescale.com
8  *         Alexander Graf, agraf@suse.de
9  *
10  * Description:
11  * This file is based on arch/powerpc/kvm/44x_tlb.c,
12  * by Hollis Blanchard <hollisb@us.ibm.com>.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License, version 2, as
16  * published by the Free Software Foundation.
17  */
18 
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/slab.h>
22 #include <linux/string.h>
23 #include <linux/kvm.h>
24 #include <linux/kvm_host.h>
25 #include <linux/highmem.h>
26 #include <linux/log2.h>
27 #include <linux/uaccess.h>
28 #include <linux/sched.h>
29 #include <linux/rwsem.h>
30 #include <linux/vmalloc.h>
31 #include <linux/hugetlb.h>
32 #include <asm/kvm_ppc.h>
33 
34 #include "e500.h"
35 #include "trace_booke.h"
36 #include "timing.h"
37 #include "e500_mmu_host.h"
38 
gtlb0_get_next_victim(struct kvmppc_vcpu_e500 * vcpu_e500)39 static inline unsigned int gtlb0_get_next_victim(
40 		struct kvmppc_vcpu_e500 *vcpu_e500)
41 {
42 	unsigned int victim;
43 
44 	victim = vcpu_e500->gtlb_nv[0]++;
45 	if (unlikely(vcpu_e500->gtlb_nv[0] >= vcpu_e500->gtlb_params[0].ways))
46 		vcpu_e500->gtlb_nv[0] = 0;
47 
48 	return victim;
49 }
50 
tlb0_set_base(gva_t addr,int sets,int ways)51 static int tlb0_set_base(gva_t addr, int sets, int ways)
52 {
53 	int set_base;
54 
55 	set_base = (addr >> PAGE_SHIFT) & (sets - 1);
56 	set_base *= ways;
57 
58 	return set_base;
59 }
60 
gtlb0_set_base(struct kvmppc_vcpu_e500 * vcpu_e500,gva_t addr)61 static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr)
62 {
63 	return tlb0_set_base(addr, vcpu_e500->gtlb_params[0].sets,
64 			     vcpu_e500->gtlb_params[0].ways);
65 }
66 
get_tlb_esel(struct kvm_vcpu * vcpu,int tlbsel)67 static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel)
68 {
69 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
70 	int esel = get_tlb_esel_bit(vcpu);
71 
72 	if (tlbsel == 0) {
73 		esel &= vcpu_e500->gtlb_params[0].ways - 1;
74 		esel += gtlb0_set_base(vcpu_e500, vcpu->arch.shared->mas2);
75 	} else {
76 		esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1;
77 	}
78 
79 	return esel;
80 }
81 
82 /* Search the guest TLB for a matching entry. */
kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 * vcpu_e500,gva_t eaddr,int tlbsel,unsigned int pid,int as)83 static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
84 		gva_t eaddr, int tlbsel, unsigned int pid, int as)
85 {
86 	int size = vcpu_e500->gtlb_params[tlbsel].entries;
87 	unsigned int set_base, offset;
88 	int i;
89 
90 	if (tlbsel == 0) {
91 		set_base = gtlb0_set_base(vcpu_e500, eaddr);
92 		size = vcpu_e500->gtlb_params[0].ways;
93 	} else {
94 		if (eaddr < vcpu_e500->tlb1_min_eaddr ||
95 				eaddr > vcpu_e500->tlb1_max_eaddr)
96 			return -1;
97 		set_base = 0;
98 	}
99 
100 	offset = vcpu_e500->gtlb_offset[tlbsel];
101 
102 	for (i = 0; i < size; i++) {
103 		struct kvm_book3e_206_tlb_entry *tlbe =
104 			&vcpu_e500->gtlb_arch[offset + set_base + i];
105 		unsigned int tid;
106 
107 		if (eaddr < get_tlb_eaddr(tlbe))
108 			continue;
109 
110 		if (eaddr > get_tlb_end(tlbe))
111 			continue;
112 
113 		tid = get_tlb_tid(tlbe);
114 		if (tid && (tid != pid))
115 			continue;
116 
117 		if (!get_tlb_v(tlbe))
118 			continue;
119 
120 		if (get_tlb_ts(tlbe) != as && as != -1)
121 			continue;
122 
123 		return set_base + i;
124 	}
125 
126 	return -1;
127 }
128 
kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu * vcpu,gva_t eaddr,int as)129 static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
130 		gva_t eaddr, int as)
131 {
132 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
133 	unsigned int victim, tsized;
134 	int tlbsel;
135 
136 	/* since we only have two TLBs, only lower bit is used. */
137 	tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1;
138 	victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
139 	tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f;
140 
141 	vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
142 		| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
143 	vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
144 		| MAS1_TID(get_tlbmiss_tid(vcpu))
145 		| MAS1_TSIZE(tsized);
146 	vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN)
147 		| (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK);
148 	vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
149 	vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1)
150 		| (get_cur_pid(vcpu) << 16)
151 		| (as ? MAS6_SAS : 0);
152 }
153 
kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 * vcpu_e500)154 static void kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500)
155 {
156 	int size = vcpu_e500->gtlb_params[1].entries;
157 	unsigned int offset;
158 	gva_t eaddr;
159 	int i;
160 
161 	vcpu_e500->tlb1_min_eaddr = ~0UL;
162 	vcpu_e500->tlb1_max_eaddr = 0;
163 	offset = vcpu_e500->gtlb_offset[1];
164 
165 	for (i = 0; i < size; i++) {
166 		struct kvm_book3e_206_tlb_entry *tlbe =
167 			&vcpu_e500->gtlb_arch[offset + i];
168 
169 		if (!get_tlb_v(tlbe))
170 			continue;
171 
172 		eaddr = get_tlb_eaddr(tlbe);
173 		vcpu_e500->tlb1_min_eaddr =
174 				min(vcpu_e500->tlb1_min_eaddr, eaddr);
175 
176 		eaddr = get_tlb_end(tlbe);
177 		vcpu_e500->tlb1_max_eaddr =
178 				max(vcpu_e500->tlb1_max_eaddr, eaddr);
179 	}
180 }
181 
kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 * vcpu_e500,struct kvm_book3e_206_tlb_entry * gtlbe)182 static int kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500,
183 				struct kvm_book3e_206_tlb_entry *gtlbe)
184 {
185 	unsigned long start, end, size;
186 
187 	size = get_tlb_bytes(gtlbe);
188 	start = get_tlb_eaddr(gtlbe) & ~(size - 1);
189 	end = start + size - 1;
190 
191 	return vcpu_e500->tlb1_min_eaddr == start ||
192 			vcpu_e500->tlb1_max_eaddr == end;
193 }
194 
195 /* This function is supposed to be called for a adding a new valid tlb entry */
kvmppc_set_tlb1map_range(struct kvm_vcpu * vcpu,struct kvm_book3e_206_tlb_entry * gtlbe)196 static void kvmppc_set_tlb1map_range(struct kvm_vcpu *vcpu,
197 				struct kvm_book3e_206_tlb_entry *gtlbe)
198 {
199 	unsigned long start, end, size;
200 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
201 
202 	if (!get_tlb_v(gtlbe))
203 		return;
204 
205 	size = get_tlb_bytes(gtlbe);
206 	start = get_tlb_eaddr(gtlbe) & ~(size - 1);
207 	end = start + size - 1;
208 
209 	vcpu_e500->tlb1_min_eaddr = min(vcpu_e500->tlb1_min_eaddr, start);
210 	vcpu_e500->tlb1_max_eaddr = max(vcpu_e500->tlb1_max_eaddr, end);
211 }
212 
kvmppc_e500_gtlbe_invalidate(struct kvmppc_vcpu_e500 * vcpu_e500,int tlbsel,int esel)213 static inline int kvmppc_e500_gtlbe_invalidate(
214 				struct kvmppc_vcpu_e500 *vcpu_e500,
215 				int tlbsel, int esel)
216 {
217 	struct kvm_book3e_206_tlb_entry *gtlbe =
218 		get_entry(vcpu_e500, tlbsel, esel);
219 
220 	if (unlikely(get_tlb_iprot(gtlbe)))
221 		return -1;
222 
223 	if (tlbsel == 1 && kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
224 		kvmppc_recalc_tlb1map_range(vcpu_e500);
225 
226 	gtlbe->mas1 = 0;
227 
228 	return 0;
229 }
230 
kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 * vcpu_e500,ulong value)231 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
232 {
233 	int esel;
234 
235 	if (value & MMUCSR0_TLB0FI)
236 		for (esel = 0; esel < vcpu_e500->gtlb_params[0].entries; esel++)
237 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
238 	if (value & MMUCSR0_TLB1FI)
239 		for (esel = 0; esel < vcpu_e500->gtlb_params[1].entries; esel++)
240 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);
241 
242 	/* Invalidate all host shadow mappings */
243 	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
244 
245 	return EMULATE_DONE;
246 }
247 
kvmppc_e500_emul_tlbivax(struct kvm_vcpu * vcpu,gva_t ea)248 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea)
249 {
250 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
251 	unsigned int ia;
252 	int esel, tlbsel;
253 
254 	ia = (ea >> 2) & 0x1;
255 
256 	/* since we only have two TLBs, only lower bit is used. */
257 	tlbsel = (ea >> 3) & 0x1;
258 
259 	if (ia) {
260 		/* invalidate all entries */
261 		for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries;
262 		     esel++)
263 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
264 	} else {
265 		ea &= 0xfffff000;
266 		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
267 				get_cur_pid(vcpu), -1);
268 		if (esel >= 0)
269 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
270 	}
271 
272 	/* Invalidate all host shadow mappings */
273 	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
274 
275 	return EMULATE_DONE;
276 }
277 
tlbilx_all(struct kvmppc_vcpu_e500 * vcpu_e500,int tlbsel,int pid,int type)278 static void tlbilx_all(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
279 		       int pid, int type)
280 {
281 	struct kvm_book3e_206_tlb_entry *tlbe;
282 	int tid, esel;
283 
284 	/* invalidate all entries */
285 	for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries; esel++) {
286 		tlbe = get_entry(vcpu_e500, tlbsel, esel);
287 		tid = get_tlb_tid(tlbe);
288 		if (type == 0 || tid == pid) {
289 			inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
290 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
291 		}
292 	}
293 }
294 
tlbilx_one(struct kvmppc_vcpu_e500 * vcpu_e500,int pid,gva_t ea)295 static void tlbilx_one(struct kvmppc_vcpu_e500 *vcpu_e500, int pid,
296 		       gva_t ea)
297 {
298 	int tlbsel, esel;
299 
300 	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
301 		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, -1);
302 		if (esel >= 0) {
303 			inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
304 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
305 			break;
306 		}
307 	}
308 }
309 
kvmppc_e500_emul_tlbilx(struct kvm_vcpu * vcpu,int type,gva_t ea)310 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea)
311 {
312 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
313 	int pid = get_cur_spid(vcpu);
314 
315 	if (type == 0 || type == 1) {
316 		tlbilx_all(vcpu_e500, 0, pid, type);
317 		tlbilx_all(vcpu_e500, 1, pid, type);
318 	} else if (type == 3) {
319 		tlbilx_one(vcpu_e500, pid, ea);
320 	}
321 
322 	return EMULATE_DONE;
323 }
324 
kvmppc_e500_emul_tlbre(struct kvm_vcpu * vcpu)325 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
326 {
327 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
328 	int tlbsel, esel;
329 	struct kvm_book3e_206_tlb_entry *gtlbe;
330 
331 	tlbsel = get_tlb_tlbsel(vcpu);
332 	esel = get_tlb_esel(vcpu, tlbsel);
333 
334 	gtlbe = get_entry(vcpu_e500, tlbsel, esel);
335 	vcpu->arch.shared->mas0 &= ~MAS0_NV(~0);
336 	vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
337 	vcpu->arch.shared->mas1 = gtlbe->mas1;
338 	vcpu->arch.shared->mas2 = gtlbe->mas2;
339 	vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
340 
341 	return EMULATE_DONE;
342 }
343 
kvmppc_e500_emul_tlbsx(struct kvm_vcpu * vcpu,gva_t ea)344 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea)
345 {
346 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
347 	int as = !!get_cur_sas(vcpu);
348 	unsigned int pid = get_cur_spid(vcpu);
349 	int esel, tlbsel;
350 	struct kvm_book3e_206_tlb_entry *gtlbe = NULL;
351 
352 	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
353 		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
354 		if (esel >= 0) {
355 			gtlbe = get_entry(vcpu_e500, tlbsel, esel);
356 			break;
357 		}
358 	}
359 
360 	if (gtlbe) {
361 		esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1;
362 
363 		vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
364 			| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
365 		vcpu->arch.shared->mas1 = gtlbe->mas1;
366 		vcpu->arch.shared->mas2 = gtlbe->mas2;
367 		vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
368 	} else {
369 		int victim;
370 
371 		/* since we only have two TLBs, only lower bit is used. */
372 		tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1;
373 		victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
374 
375 		vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel)
376 			| MAS0_ESEL(victim)
377 			| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
378 		vcpu->arch.shared->mas1 =
379 			  (vcpu->arch.shared->mas6 & MAS6_SPID0)
380 			| ((vcpu->arch.shared->mas6 & MAS6_SAS) ? MAS1_TS : 0)
381 			| (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0));
382 		vcpu->arch.shared->mas2 &= MAS2_EPN;
383 		vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 &
384 					   MAS2_ATTRIB_MASK;
385 		vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 |
386 					     MAS3_U2 | MAS3_U3;
387 	}
388 
389 	kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
390 	return EMULATE_DONE;
391 }
392 
kvmppc_e500_emul_tlbwe(struct kvm_vcpu * vcpu)393 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
394 {
395 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
396 	struct kvm_book3e_206_tlb_entry *gtlbe;
397 	int tlbsel, esel;
398 	int recal = 0;
399 	int idx;
400 
401 	tlbsel = get_tlb_tlbsel(vcpu);
402 	esel = get_tlb_esel(vcpu, tlbsel);
403 
404 	gtlbe = get_entry(vcpu_e500, tlbsel, esel);
405 
406 	if (get_tlb_v(gtlbe)) {
407 		inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
408 		if ((tlbsel == 1) &&
409 			kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
410 			recal = 1;
411 	}
412 
413 	gtlbe->mas1 = vcpu->arch.shared->mas1;
414 	gtlbe->mas2 = vcpu->arch.shared->mas2;
415 	if (!(vcpu->arch.shared->msr & MSR_CM))
416 		gtlbe->mas2 &= 0xffffffffUL;
417 	gtlbe->mas7_3 = vcpu->arch.shared->mas7_3;
418 
419 	trace_kvm_booke206_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1,
420 	                              gtlbe->mas2, gtlbe->mas7_3);
421 
422 	if (tlbsel == 1) {
423 		/*
424 		 * If a valid tlb1 entry is overwritten then recalculate the
425 		 * min/max TLB1 map address range otherwise no need to look
426 		 * in tlb1 array.
427 		 */
428 		if (recal)
429 			kvmppc_recalc_tlb1map_range(vcpu_e500);
430 		else
431 			kvmppc_set_tlb1map_range(vcpu, gtlbe);
432 	}
433 
434 	idx = srcu_read_lock(&vcpu->kvm->srcu);
435 
436 	/* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
437 	if (tlbe_is_host_safe(vcpu, gtlbe)) {
438 		u64 eaddr = get_tlb_eaddr(gtlbe);
439 		u64 raddr = get_tlb_raddr(gtlbe);
440 
441 		if (tlbsel == 0) {
442 			gtlbe->mas1 &= ~MAS1_TSIZE(~0);
443 			gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K);
444 		}
445 
446 		/* Premap the faulting page */
447 		kvmppc_mmu_map(vcpu, eaddr, raddr, index_of(tlbsel, esel));
448 	}
449 
450 	srcu_read_unlock(&vcpu->kvm->srcu, idx);
451 
452 	kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS);
453 	return EMULATE_DONE;
454 }
455 
kvmppc_e500_tlb_search(struct kvm_vcpu * vcpu,gva_t eaddr,unsigned int pid,int as)456 static int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
457 				  gva_t eaddr, unsigned int pid, int as)
458 {
459 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
460 	int esel, tlbsel;
461 
462 	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
463 		esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
464 		if (esel >= 0)
465 			return index_of(tlbsel, esel);
466 	}
467 
468 	return -1;
469 }
470 
471 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
kvmppc_core_vcpu_translate(struct kvm_vcpu * vcpu,struct kvm_translation * tr)472 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
473                                struct kvm_translation *tr)
474 {
475 	int index;
476 	gva_t eaddr;
477 	u8 pid;
478 	u8 as;
479 
480 	eaddr = tr->linear_address;
481 	pid = (tr->linear_address >> 32) & 0xff;
482 	as = (tr->linear_address >> 40) & 0x1;
483 
484 	index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
485 	if (index < 0) {
486 		tr->valid = 0;
487 		return 0;
488 	}
489 
490 	tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
491 	/* XXX what does "writeable" and "usermode" even mean? */
492 	tr->valid = 1;
493 
494 	return 0;
495 }
496 
497 
kvmppc_mmu_itlb_index(struct kvm_vcpu * vcpu,gva_t eaddr)498 int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
499 {
500 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
501 
502 	return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
503 }
504 
kvmppc_mmu_dtlb_index(struct kvm_vcpu * vcpu,gva_t eaddr)505 int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
506 {
507 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
508 
509 	return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
510 }
511 
kvmppc_mmu_itlb_miss(struct kvm_vcpu * vcpu)512 void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
513 {
514 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
515 
516 	kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as);
517 }
518 
kvmppc_mmu_dtlb_miss(struct kvm_vcpu * vcpu)519 void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
520 {
521 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
522 
523 	kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
524 }
525 
kvmppc_mmu_xlate(struct kvm_vcpu * vcpu,unsigned int index,gva_t eaddr)526 gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
527 			gva_t eaddr)
528 {
529 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
530 	struct kvm_book3e_206_tlb_entry *gtlbe;
531 	u64 pgmask;
532 
533 	gtlbe = get_entry(vcpu_e500, tlbsel_of(index), esel_of(index));
534 	pgmask = get_tlb_bytes(gtlbe) - 1;
535 
536 	return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
537 }
538 
kvmppc_mmu_destroy_e500(struct kvm_vcpu * vcpu)539 void kvmppc_mmu_destroy_e500(struct kvm_vcpu *vcpu)
540 {
541 }
542 
543 /*****************************************/
544 
free_gtlb(struct kvmppc_vcpu_e500 * vcpu_e500)545 static void free_gtlb(struct kvmppc_vcpu_e500 *vcpu_e500)
546 {
547 	int i;
548 
549 	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
550 	kfree(vcpu_e500->g2h_tlb1_map);
551 	kfree(vcpu_e500->gtlb_priv[0]);
552 	kfree(vcpu_e500->gtlb_priv[1]);
553 
554 	if (vcpu_e500->shared_tlb_pages) {
555 		vfree((void *)(round_down((uintptr_t)vcpu_e500->gtlb_arch,
556 					  PAGE_SIZE)));
557 
558 		for (i = 0; i < vcpu_e500->num_shared_tlb_pages; i++) {
559 			set_page_dirty_lock(vcpu_e500->shared_tlb_pages[i]);
560 			put_page(vcpu_e500->shared_tlb_pages[i]);
561 		}
562 
563 		vcpu_e500->num_shared_tlb_pages = 0;
564 
565 		kfree(vcpu_e500->shared_tlb_pages);
566 		vcpu_e500->shared_tlb_pages = NULL;
567 	} else {
568 		kfree(vcpu_e500->gtlb_arch);
569 	}
570 
571 	vcpu_e500->gtlb_arch = NULL;
572 }
573 
kvmppc_get_sregs_e500_tlb(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)574 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
575 {
576 	sregs->u.e.mas0 = vcpu->arch.shared->mas0;
577 	sregs->u.e.mas1 = vcpu->arch.shared->mas1;
578 	sregs->u.e.mas2 = vcpu->arch.shared->mas2;
579 	sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3;
580 	sregs->u.e.mas4 = vcpu->arch.shared->mas4;
581 	sregs->u.e.mas6 = vcpu->arch.shared->mas6;
582 
583 	sregs->u.e.mmucfg = vcpu->arch.mmucfg;
584 	sregs->u.e.tlbcfg[0] = vcpu->arch.tlbcfg[0];
585 	sregs->u.e.tlbcfg[1] = vcpu->arch.tlbcfg[1];
586 	sregs->u.e.tlbcfg[2] = 0;
587 	sregs->u.e.tlbcfg[3] = 0;
588 }
589 
kvmppc_set_sregs_e500_tlb(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)590 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
591 {
592 	if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
593 		vcpu->arch.shared->mas0 = sregs->u.e.mas0;
594 		vcpu->arch.shared->mas1 = sregs->u.e.mas1;
595 		vcpu->arch.shared->mas2 = sregs->u.e.mas2;
596 		vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3;
597 		vcpu->arch.shared->mas4 = sregs->u.e.mas4;
598 		vcpu->arch.shared->mas6 = sregs->u.e.mas6;
599 	}
600 
601 	return 0;
602 }
603 
kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu * vcpu,u64 id,union kvmppc_one_reg * val)604 int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
605 				union kvmppc_one_reg *val)
606 {
607 	int r = 0;
608 	long int i;
609 
610 	switch (id) {
611 	case KVM_REG_PPC_MAS0:
612 		*val = get_reg_val(id, vcpu->arch.shared->mas0);
613 		break;
614 	case KVM_REG_PPC_MAS1:
615 		*val = get_reg_val(id, vcpu->arch.shared->mas1);
616 		break;
617 	case KVM_REG_PPC_MAS2:
618 		*val = get_reg_val(id, vcpu->arch.shared->mas2);
619 		break;
620 	case KVM_REG_PPC_MAS7_3:
621 		*val = get_reg_val(id, vcpu->arch.shared->mas7_3);
622 		break;
623 	case KVM_REG_PPC_MAS4:
624 		*val = get_reg_val(id, vcpu->arch.shared->mas4);
625 		break;
626 	case KVM_REG_PPC_MAS6:
627 		*val = get_reg_val(id, vcpu->arch.shared->mas6);
628 		break;
629 	case KVM_REG_PPC_MMUCFG:
630 		*val = get_reg_val(id, vcpu->arch.mmucfg);
631 		break;
632 	case KVM_REG_PPC_EPTCFG:
633 		*val = get_reg_val(id, vcpu->arch.eptcfg);
634 		break;
635 	case KVM_REG_PPC_TLB0CFG:
636 	case KVM_REG_PPC_TLB1CFG:
637 	case KVM_REG_PPC_TLB2CFG:
638 	case KVM_REG_PPC_TLB3CFG:
639 		i = id - KVM_REG_PPC_TLB0CFG;
640 		*val = get_reg_val(id, vcpu->arch.tlbcfg[i]);
641 		break;
642 	case KVM_REG_PPC_TLB0PS:
643 	case KVM_REG_PPC_TLB1PS:
644 	case KVM_REG_PPC_TLB2PS:
645 	case KVM_REG_PPC_TLB3PS:
646 		i = id - KVM_REG_PPC_TLB0PS;
647 		*val = get_reg_val(id, vcpu->arch.tlbps[i]);
648 		break;
649 	default:
650 		r = -EINVAL;
651 		break;
652 	}
653 
654 	return r;
655 }
656 
kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu * vcpu,u64 id,union kvmppc_one_reg * val)657 int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
658 			       union kvmppc_one_reg *val)
659 {
660 	int r = 0;
661 	long int i;
662 
663 	switch (id) {
664 	case KVM_REG_PPC_MAS0:
665 		vcpu->arch.shared->mas0 = set_reg_val(id, *val);
666 		break;
667 	case KVM_REG_PPC_MAS1:
668 		vcpu->arch.shared->mas1 = set_reg_val(id, *val);
669 		break;
670 	case KVM_REG_PPC_MAS2:
671 		vcpu->arch.shared->mas2 = set_reg_val(id, *val);
672 		break;
673 	case KVM_REG_PPC_MAS7_3:
674 		vcpu->arch.shared->mas7_3 = set_reg_val(id, *val);
675 		break;
676 	case KVM_REG_PPC_MAS4:
677 		vcpu->arch.shared->mas4 = set_reg_val(id, *val);
678 		break;
679 	case KVM_REG_PPC_MAS6:
680 		vcpu->arch.shared->mas6 = set_reg_val(id, *val);
681 		break;
682 	/* Only allow MMU registers to be set to the config supported by KVM */
683 	case KVM_REG_PPC_MMUCFG: {
684 		u32 reg = set_reg_val(id, *val);
685 		if (reg != vcpu->arch.mmucfg)
686 			r = -EINVAL;
687 		break;
688 	}
689 	case KVM_REG_PPC_EPTCFG: {
690 		u32 reg = set_reg_val(id, *val);
691 		if (reg != vcpu->arch.eptcfg)
692 			r = -EINVAL;
693 		break;
694 	}
695 	case KVM_REG_PPC_TLB0CFG:
696 	case KVM_REG_PPC_TLB1CFG:
697 	case KVM_REG_PPC_TLB2CFG:
698 	case KVM_REG_PPC_TLB3CFG: {
699 		/* MMU geometry (N_ENTRY/ASSOC) can be set only using SW_TLB */
700 		u32 reg = set_reg_val(id, *val);
701 		i = id - KVM_REG_PPC_TLB0CFG;
702 		if (reg != vcpu->arch.tlbcfg[i])
703 			r = -EINVAL;
704 		break;
705 	}
706 	case KVM_REG_PPC_TLB0PS:
707 	case KVM_REG_PPC_TLB1PS:
708 	case KVM_REG_PPC_TLB2PS:
709 	case KVM_REG_PPC_TLB3PS: {
710 		u32 reg = set_reg_val(id, *val);
711 		i = id - KVM_REG_PPC_TLB0PS;
712 		if (reg != vcpu->arch.tlbps[i])
713 			r = -EINVAL;
714 		break;
715 	}
716 	default:
717 		r = -EINVAL;
718 		break;
719 	}
720 
721 	return r;
722 }
723 
vcpu_mmu_geometry_update(struct kvm_vcpu * vcpu,struct kvm_book3e_206_tlb_params * params)724 static int vcpu_mmu_geometry_update(struct kvm_vcpu *vcpu,
725 		struct kvm_book3e_206_tlb_params *params)
726 {
727 	vcpu->arch.tlbcfg[0] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
728 	if (params->tlb_sizes[0] <= 2048)
729 		vcpu->arch.tlbcfg[0] |= params->tlb_sizes[0];
730 	vcpu->arch.tlbcfg[0] |= params->tlb_ways[0] << TLBnCFG_ASSOC_SHIFT;
731 
732 	vcpu->arch.tlbcfg[1] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
733 	vcpu->arch.tlbcfg[1] |= params->tlb_sizes[1];
734 	vcpu->arch.tlbcfg[1] |= params->tlb_ways[1] << TLBnCFG_ASSOC_SHIFT;
735 	return 0;
736 }
737 
kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu * vcpu,struct kvm_config_tlb * cfg)738 int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
739 			      struct kvm_config_tlb *cfg)
740 {
741 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
742 	struct kvm_book3e_206_tlb_params params;
743 	char *virt;
744 	struct page **pages;
745 	struct tlbe_priv *privs[2] = {};
746 	u64 *g2h_bitmap = NULL;
747 	size_t array_len;
748 	u32 sets;
749 	int num_pages, ret, i;
750 
751 	if (cfg->mmu_type != KVM_MMU_FSL_BOOKE_NOHV)
752 		return -EINVAL;
753 
754 	if (copy_from_user(&params, (void __user *)(uintptr_t)cfg->params,
755 			   sizeof(params)))
756 		return -EFAULT;
757 
758 	if (params.tlb_sizes[1] > 64)
759 		return -EINVAL;
760 	if (params.tlb_ways[1] != params.tlb_sizes[1])
761 		return -EINVAL;
762 	if (params.tlb_sizes[2] != 0 || params.tlb_sizes[3] != 0)
763 		return -EINVAL;
764 	if (params.tlb_ways[2] != 0 || params.tlb_ways[3] != 0)
765 		return -EINVAL;
766 
767 	if (!is_power_of_2(params.tlb_ways[0]))
768 		return -EINVAL;
769 
770 	sets = params.tlb_sizes[0] >> ilog2(params.tlb_ways[0]);
771 	if (!is_power_of_2(sets))
772 		return -EINVAL;
773 
774 	array_len = params.tlb_sizes[0] + params.tlb_sizes[1];
775 	array_len *= sizeof(struct kvm_book3e_206_tlb_entry);
776 
777 	if (cfg->array_len < array_len)
778 		return -EINVAL;
779 
780 	num_pages = DIV_ROUND_UP(cfg->array + array_len - 1, PAGE_SIZE) -
781 		    cfg->array / PAGE_SIZE;
782 	pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
783 	if (!pages)
784 		return -ENOMEM;
785 
786 	ret = get_user_pages_fast(cfg->array, num_pages, 1, pages);
787 	if (ret < 0)
788 		goto err_pages;
789 
790 	if (ret != num_pages) {
791 		num_pages = ret;
792 		ret = -EFAULT;
793 		goto err_put_page;
794 	}
795 
796 	virt = vmap(pages, num_pages, VM_MAP, PAGE_KERNEL);
797 	if (!virt) {
798 		ret = -ENOMEM;
799 		goto err_put_page;
800 	}
801 
802 	privs[0] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[0],
803 			   GFP_KERNEL);
804 	privs[1] = kzalloc(sizeof(struct tlbe_priv) * params.tlb_sizes[1],
805 			   GFP_KERNEL);
806 
807 	if (!privs[0] || !privs[1]) {
808 		ret = -ENOMEM;
809 		goto err_privs;
810 	}
811 
812 	g2h_bitmap = kzalloc(sizeof(u64) * params.tlb_sizes[1],
813 	                     GFP_KERNEL);
814 	if (!g2h_bitmap) {
815 		ret = -ENOMEM;
816 		goto err_privs;
817 	}
818 
819 	free_gtlb(vcpu_e500);
820 
821 	vcpu_e500->gtlb_priv[0] = privs[0];
822 	vcpu_e500->gtlb_priv[1] = privs[1];
823 	vcpu_e500->g2h_tlb1_map = g2h_bitmap;
824 
825 	vcpu_e500->gtlb_arch = (struct kvm_book3e_206_tlb_entry *)
826 		(virt + (cfg->array & (PAGE_SIZE - 1)));
827 
828 	vcpu_e500->gtlb_params[0].entries = params.tlb_sizes[0];
829 	vcpu_e500->gtlb_params[1].entries = params.tlb_sizes[1];
830 
831 	vcpu_e500->gtlb_offset[0] = 0;
832 	vcpu_e500->gtlb_offset[1] = params.tlb_sizes[0];
833 
834 	/* Update vcpu's MMU geometry based on SW_TLB input */
835 	vcpu_mmu_geometry_update(vcpu, &params);
836 
837 	vcpu_e500->shared_tlb_pages = pages;
838 	vcpu_e500->num_shared_tlb_pages = num_pages;
839 
840 	vcpu_e500->gtlb_params[0].ways = params.tlb_ways[0];
841 	vcpu_e500->gtlb_params[0].sets = sets;
842 
843 	vcpu_e500->gtlb_params[1].ways = params.tlb_sizes[1];
844 	vcpu_e500->gtlb_params[1].sets = 1;
845 
846 	kvmppc_recalc_tlb1map_range(vcpu_e500);
847 	return 0;
848 
849 err_privs:
850 	kfree(privs[0]);
851 	kfree(privs[1]);
852 
853 err_put_page:
854 	for (i = 0; i < num_pages; i++)
855 		put_page(pages[i]);
856 
857 err_pages:
858 	kfree(pages);
859 	return ret;
860 }
861 
kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu * vcpu,struct kvm_dirty_tlb * dirty)862 int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu,
863 			     struct kvm_dirty_tlb *dirty)
864 {
865 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
866 	kvmppc_recalc_tlb1map_range(vcpu_e500);
867 	kvmppc_core_flush_tlb(vcpu);
868 	return 0;
869 }
870 
871 /* Vcpu's MMU default configuration */
vcpu_mmu_init(struct kvm_vcpu * vcpu,struct kvmppc_e500_tlb_params * params)872 static int vcpu_mmu_init(struct kvm_vcpu *vcpu,
873 		       struct kvmppc_e500_tlb_params *params)
874 {
875 	/* Initialize RASIZE, PIDSIZE, NTLBS and MAVN fields with host values*/
876 	vcpu->arch.mmucfg = mfspr(SPRN_MMUCFG) & ~MMUCFG_LPIDSIZE;
877 
878 	/* Initialize TLBnCFG fields with host values and SW_TLB geometry*/
879 	vcpu->arch.tlbcfg[0] = mfspr(SPRN_TLB0CFG) &
880 			     ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
881 	vcpu->arch.tlbcfg[0] |= params[0].entries;
882 	vcpu->arch.tlbcfg[0] |= params[0].ways << TLBnCFG_ASSOC_SHIFT;
883 
884 	vcpu->arch.tlbcfg[1] = mfspr(SPRN_TLB1CFG) &
885 			     ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
886 	vcpu->arch.tlbcfg[1] |= params[1].entries;
887 	vcpu->arch.tlbcfg[1] |= params[1].ways << TLBnCFG_ASSOC_SHIFT;
888 
889 	if (has_feature(vcpu, VCPU_FTR_MMU_V2)) {
890 		vcpu->arch.tlbps[0] = mfspr(SPRN_TLB0PS);
891 		vcpu->arch.tlbps[1] = mfspr(SPRN_TLB1PS);
892 
893 		vcpu->arch.mmucfg &= ~MMUCFG_LRAT;
894 
895 		/* Guest mmu emulation currently doesn't handle E.PT */
896 		vcpu->arch.eptcfg = 0;
897 		vcpu->arch.tlbcfg[0] &= ~TLBnCFG_PT;
898 		vcpu->arch.tlbcfg[1] &= ~TLBnCFG_IND;
899 	}
900 
901 	return 0;
902 }
903 
kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 * vcpu_e500)904 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
905 {
906 	struct kvm_vcpu *vcpu = &vcpu_e500->vcpu;
907 	int entry_size = sizeof(struct kvm_book3e_206_tlb_entry);
908 	int entries = KVM_E500_TLB0_SIZE + KVM_E500_TLB1_SIZE;
909 
910 	if (e500_mmu_host_init(vcpu_e500))
911 		goto err;
912 
913 	vcpu_e500->gtlb_params[0].entries = KVM_E500_TLB0_SIZE;
914 	vcpu_e500->gtlb_params[1].entries = KVM_E500_TLB1_SIZE;
915 
916 	vcpu_e500->gtlb_params[0].ways = KVM_E500_TLB0_WAY_NUM;
917 	vcpu_e500->gtlb_params[0].sets =
918 		KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM;
919 
920 	vcpu_e500->gtlb_params[1].ways = KVM_E500_TLB1_SIZE;
921 	vcpu_e500->gtlb_params[1].sets = 1;
922 
923 	vcpu_e500->gtlb_arch = kmalloc(entries * entry_size, GFP_KERNEL);
924 	if (!vcpu_e500->gtlb_arch)
925 		return -ENOMEM;
926 
927 	vcpu_e500->gtlb_offset[0] = 0;
928 	vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE;
929 
930 	vcpu_e500->gtlb_priv[0] = kzalloc(sizeof(struct tlbe_ref) *
931 					  vcpu_e500->gtlb_params[0].entries,
932 					  GFP_KERNEL);
933 	if (!vcpu_e500->gtlb_priv[0])
934 		goto err;
935 
936 	vcpu_e500->gtlb_priv[1] = kzalloc(sizeof(struct tlbe_ref) *
937 					  vcpu_e500->gtlb_params[1].entries,
938 					  GFP_KERNEL);
939 	if (!vcpu_e500->gtlb_priv[1])
940 		goto err;
941 
942 	vcpu_e500->g2h_tlb1_map = kzalloc(sizeof(u64) *
943 					  vcpu_e500->gtlb_params[1].entries,
944 					  GFP_KERNEL);
945 	if (!vcpu_e500->g2h_tlb1_map)
946 		goto err;
947 
948 	vcpu_mmu_init(vcpu, vcpu_e500->gtlb_params);
949 
950 	kvmppc_recalc_tlb1map_range(vcpu_e500);
951 	return 0;
952 
953 err:
954 	free_gtlb(vcpu_e500);
955 	return -1;
956 }
957 
kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 * vcpu_e500)958 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
959 {
960 	free_gtlb(vcpu_e500);
961 	e500_mmu_host_uninit(vcpu_e500);
962 }
963