xref: /linux/arch/powerpc/kvm/e500_mmu.c (revision ead5d1f4d877e92c051e1a1ade623d0d30e71619)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2008-2013 Freescale Semiconductor, Inc. All rights reserved.
4  *
5  * Author: Yu Liu, yu.liu@freescale.com
6  *         Scott Wood, scottwood@freescale.com
7  *         Ashish Kalra, ashish.kalra@freescale.com
8  *         Varun Sethi, varun.sethi@freescale.com
9  *         Alexander Graf, agraf@suse.de
10  *
11  * Description:
12  * This file is based on arch/powerpc/kvm/44x_tlb.c,
13  * by Hollis Blanchard <hollisb@us.ibm.com>.
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/string.h>
20 #include <linux/kvm.h>
21 #include <linux/kvm_host.h>
22 #include <linux/highmem.h>
23 #include <linux/log2.h>
24 #include <linux/uaccess.h>
25 #include <linux/sched.h>
26 #include <linux/rwsem.h>
27 #include <linux/vmalloc.h>
28 #include <linux/hugetlb.h>
29 #include <asm/kvm_ppc.h>
30 
31 #include "e500.h"
32 #include "trace_booke.h"
33 #include "timing.h"
34 #include "e500_mmu_host.h"
35 
gtlb0_get_next_victim(struct kvmppc_vcpu_e500 * vcpu_e500)36 static inline unsigned int gtlb0_get_next_victim(
37 		struct kvmppc_vcpu_e500 *vcpu_e500)
38 {
39 	unsigned int victim;
40 
41 	victim = vcpu_e500->gtlb_nv[0]++;
42 	if (unlikely(vcpu_e500->gtlb_nv[0] >= vcpu_e500->gtlb_params[0].ways))
43 		vcpu_e500->gtlb_nv[0] = 0;
44 
45 	return victim;
46 }
47 
tlb0_set_base(gva_t addr,int sets,int ways)48 static int tlb0_set_base(gva_t addr, int sets, int ways)
49 {
50 	int set_base;
51 
52 	set_base = (addr >> PAGE_SHIFT) & (sets - 1);
53 	set_base *= ways;
54 
55 	return set_base;
56 }
57 
gtlb0_set_base(struct kvmppc_vcpu_e500 * vcpu_e500,gva_t addr)58 static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr)
59 {
60 	return tlb0_set_base(addr, vcpu_e500->gtlb_params[0].sets,
61 			     vcpu_e500->gtlb_params[0].ways);
62 }
63 
get_tlb_esel(struct kvm_vcpu * vcpu,int tlbsel)64 static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel)
65 {
66 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
67 	int esel = get_tlb_esel_bit(vcpu);
68 
69 	if (tlbsel == 0) {
70 		esel &= vcpu_e500->gtlb_params[0].ways - 1;
71 		esel += gtlb0_set_base(vcpu_e500, vcpu->arch.shared->mas2);
72 	} else {
73 		esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1;
74 	}
75 
76 	return esel;
77 }
78 
79 /* 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)80 static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
81 		gva_t eaddr, int tlbsel, unsigned int pid, int as)
82 {
83 	int size = vcpu_e500->gtlb_params[tlbsel].entries;
84 	unsigned int set_base, offset;
85 	int i;
86 
87 	if (tlbsel == 0) {
88 		set_base = gtlb0_set_base(vcpu_e500, eaddr);
89 		size = vcpu_e500->gtlb_params[0].ways;
90 	} else {
91 		if (eaddr < vcpu_e500->tlb1_min_eaddr ||
92 				eaddr > vcpu_e500->tlb1_max_eaddr)
93 			return -1;
94 		set_base = 0;
95 	}
96 
97 	offset = vcpu_e500->gtlb_offset[tlbsel];
98 
99 	for (i = 0; i < size; i++) {
100 		struct kvm_book3e_206_tlb_entry *tlbe =
101 			&vcpu_e500->gtlb_arch[offset + set_base + i];
102 		unsigned int tid;
103 
104 		if (eaddr < get_tlb_eaddr(tlbe))
105 			continue;
106 
107 		if (eaddr > get_tlb_end(tlbe))
108 			continue;
109 
110 		tid = get_tlb_tid(tlbe);
111 		if (tid && (tid != pid))
112 			continue;
113 
114 		if (!get_tlb_v(tlbe))
115 			continue;
116 
117 		if (get_tlb_ts(tlbe) != as && as != -1)
118 			continue;
119 
120 		return set_base + i;
121 	}
122 
123 	return -1;
124 }
125 
kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu * vcpu,gva_t eaddr,int as)126 static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
127 		gva_t eaddr, int as)
128 {
129 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
130 	unsigned int victim, tsized;
131 	int tlbsel;
132 
133 	/* since we only have two TLBs, only lower bit is used. */
134 	tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1;
135 	victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
136 	tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f;
137 
138 	vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
139 		| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
140 	vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
141 		| MAS1_TID(get_tlbmiss_tid(vcpu))
142 		| MAS1_TSIZE(tsized);
143 	vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN)
144 		| (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK);
145 	vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
146 	vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1)
147 		| (get_cur_pid(vcpu) << 16)
148 		| (as ? MAS6_SAS : 0);
149 }
150 
kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 * vcpu_e500)151 static void kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500)
152 {
153 	int size = vcpu_e500->gtlb_params[1].entries;
154 	unsigned int offset;
155 	gva_t eaddr;
156 	int i;
157 
158 	vcpu_e500->tlb1_min_eaddr = ~0UL;
159 	vcpu_e500->tlb1_max_eaddr = 0;
160 	offset = vcpu_e500->gtlb_offset[1];
161 
162 	for (i = 0; i < size; i++) {
163 		struct kvm_book3e_206_tlb_entry *tlbe =
164 			&vcpu_e500->gtlb_arch[offset + i];
165 
166 		if (!get_tlb_v(tlbe))
167 			continue;
168 
169 		eaddr = get_tlb_eaddr(tlbe);
170 		vcpu_e500->tlb1_min_eaddr =
171 				min(vcpu_e500->tlb1_min_eaddr, eaddr);
172 
173 		eaddr = get_tlb_end(tlbe);
174 		vcpu_e500->tlb1_max_eaddr =
175 				max(vcpu_e500->tlb1_max_eaddr, eaddr);
176 	}
177 }
178 
kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 * vcpu_e500,struct kvm_book3e_206_tlb_entry * gtlbe)179 static int kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500,
180 				struct kvm_book3e_206_tlb_entry *gtlbe)
181 {
182 	unsigned long start, end, size;
183 
184 	size = get_tlb_bytes(gtlbe);
185 	start = get_tlb_eaddr(gtlbe) & ~(size - 1);
186 	end = start + size - 1;
187 
188 	return vcpu_e500->tlb1_min_eaddr == start ||
189 			vcpu_e500->tlb1_max_eaddr == end;
190 }
191 
192 /* 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)193 static void kvmppc_set_tlb1map_range(struct kvm_vcpu *vcpu,
194 				struct kvm_book3e_206_tlb_entry *gtlbe)
195 {
196 	unsigned long start, end, size;
197 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
198 
199 	if (!get_tlb_v(gtlbe))
200 		return;
201 
202 	size = get_tlb_bytes(gtlbe);
203 	start = get_tlb_eaddr(gtlbe) & ~(size - 1);
204 	end = start + size - 1;
205 
206 	vcpu_e500->tlb1_min_eaddr = min(vcpu_e500->tlb1_min_eaddr, start);
207 	vcpu_e500->tlb1_max_eaddr = max(vcpu_e500->tlb1_max_eaddr, end);
208 }
209 
kvmppc_e500_gtlbe_invalidate(struct kvmppc_vcpu_e500 * vcpu_e500,int tlbsel,int esel)210 static inline int kvmppc_e500_gtlbe_invalidate(
211 				struct kvmppc_vcpu_e500 *vcpu_e500,
212 				int tlbsel, int esel)
213 {
214 	struct kvm_book3e_206_tlb_entry *gtlbe =
215 		get_entry(vcpu_e500, tlbsel, esel);
216 
217 	if (unlikely(get_tlb_iprot(gtlbe)))
218 		return -1;
219 
220 	if (tlbsel == 1 && kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
221 		kvmppc_recalc_tlb1map_range(vcpu_e500);
222 
223 	gtlbe->mas1 = 0;
224 
225 	return 0;
226 }
227 
kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 * vcpu_e500,ulong value)228 int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
229 {
230 	int esel;
231 
232 	if (value & MMUCSR0_TLB0FI)
233 		for (esel = 0; esel < vcpu_e500->gtlb_params[0].entries; esel++)
234 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
235 	if (value & MMUCSR0_TLB1FI)
236 		for (esel = 0; esel < vcpu_e500->gtlb_params[1].entries; esel++)
237 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);
238 
239 	/* Invalidate all host shadow mappings */
240 	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
241 
242 	return EMULATE_DONE;
243 }
244 
kvmppc_e500_emul_tlbivax(struct kvm_vcpu * vcpu,gva_t ea)245 int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea)
246 {
247 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
248 	unsigned int ia;
249 	int esel, tlbsel;
250 
251 	ia = (ea >> 2) & 0x1;
252 
253 	/* since we only have two TLBs, only lower bit is used. */
254 	tlbsel = (ea >> 3) & 0x1;
255 
256 	if (ia) {
257 		/* invalidate all entries */
258 		for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries;
259 		     esel++)
260 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
261 	} else {
262 		ea &= 0xfffff000;
263 		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
264 				get_cur_pid(vcpu), -1);
265 		if (esel >= 0)
266 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
267 	}
268 
269 	/* Invalidate all host shadow mappings */
270 	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
271 
272 	return EMULATE_DONE;
273 }
274 
tlbilx_all(struct kvmppc_vcpu_e500 * vcpu_e500,int tlbsel,int pid,int type)275 static void tlbilx_all(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
276 		       int pid, int type)
277 {
278 	struct kvm_book3e_206_tlb_entry *tlbe;
279 	int tid, esel;
280 
281 	/* invalidate all entries */
282 	for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries; esel++) {
283 		tlbe = get_entry(vcpu_e500, tlbsel, esel);
284 		tid = get_tlb_tid(tlbe);
285 		if (type == 0 || tid == pid) {
286 			inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
287 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
288 		}
289 	}
290 }
291 
tlbilx_one(struct kvmppc_vcpu_e500 * vcpu_e500,int pid,gva_t ea)292 static void tlbilx_one(struct kvmppc_vcpu_e500 *vcpu_e500, int pid,
293 		       gva_t ea)
294 {
295 	int tlbsel, esel;
296 
297 	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
298 		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, -1);
299 		if (esel >= 0) {
300 			inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
301 			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
302 			break;
303 		}
304 	}
305 }
306 
kvmppc_e500_emul_tlbilx(struct kvm_vcpu * vcpu,int type,gva_t ea)307 int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea)
308 {
309 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
310 	int pid = get_cur_spid(vcpu);
311 
312 	if (type == 0 || type == 1) {
313 		tlbilx_all(vcpu_e500, 0, pid, type);
314 		tlbilx_all(vcpu_e500, 1, pid, type);
315 	} else if (type == 3) {
316 		tlbilx_one(vcpu_e500, pid, ea);
317 	}
318 
319 	return EMULATE_DONE;
320 }
321 
kvmppc_e500_emul_tlbre(struct kvm_vcpu * vcpu)322 int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
323 {
324 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
325 	int tlbsel, esel;
326 	struct kvm_book3e_206_tlb_entry *gtlbe;
327 
328 	tlbsel = get_tlb_tlbsel(vcpu);
329 	esel = get_tlb_esel(vcpu, tlbsel);
330 
331 	gtlbe = get_entry(vcpu_e500, tlbsel, esel);
332 	vcpu->arch.shared->mas0 &= ~MAS0_NV(~0);
333 	vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
334 	vcpu->arch.shared->mas1 = gtlbe->mas1;
335 	vcpu->arch.shared->mas2 = gtlbe->mas2;
336 	vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
337 
338 	return EMULATE_DONE;
339 }
340 
kvmppc_e500_emul_tlbsx(struct kvm_vcpu * vcpu,gva_t ea)341 int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea)
342 {
343 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
344 	int as = !!get_cur_sas(vcpu);
345 	unsigned int pid = get_cur_spid(vcpu);
346 	int esel, tlbsel;
347 	struct kvm_book3e_206_tlb_entry *gtlbe = NULL;
348 
349 	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
350 		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
351 		if (esel >= 0) {
352 			gtlbe = get_entry(vcpu_e500, tlbsel, esel);
353 			break;
354 		}
355 	}
356 
357 	if (gtlbe) {
358 		esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1;
359 
360 		vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
361 			| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
362 		vcpu->arch.shared->mas1 = gtlbe->mas1;
363 		vcpu->arch.shared->mas2 = gtlbe->mas2;
364 		vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
365 	} else {
366 		int victim;
367 
368 		/* since we only have two TLBs, only lower bit is used. */
369 		tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1;
370 		victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
371 
372 		vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel)
373 			| MAS0_ESEL(victim)
374 			| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
375 		vcpu->arch.shared->mas1 =
376 			  (vcpu->arch.shared->mas6 & MAS6_SPID0)
377 			| ((vcpu->arch.shared->mas6 & MAS6_SAS) ? MAS1_TS : 0)
378 			| (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0));
379 		vcpu->arch.shared->mas2 &= MAS2_EPN;
380 		vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 &
381 					   MAS2_ATTRIB_MASK;
382 		vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 |
383 					     MAS3_U2 | MAS3_U3;
384 	}
385 
386 	kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
387 	return EMULATE_DONE;
388 }
389 
kvmppc_e500_emul_tlbwe(struct kvm_vcpu * vcpu)390 int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
391 {
392 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
393 	struct kvm_book3e_206_tlb_entry *gtlbe;
394 	int tlbsel, esel;
395 	int recal = 0;
396 	int idx;
397 
398 	tlbsel = get_tlb_tlbsel(vcpu);
399 	esel = get_tlb_esel(vcpu, tlbsel);
400 
401 	gtlbe = get_entry(vcpu_e500, tlbsel, esel);
402 
403 	if (get_tlb_v(gtlbe)) {
404 		inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
405 		if ((tlbsel == 1) &&
406 			kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
407 			recal = 1;
408 	}
409 
410 	gtlbe->mas1 = vcpu->arch.shared->mas1;
411 	gtlbe->mas2 = vcpu->arch.shared->mas2;
412 	if (!(vcpu->arch.shared->msr & MSR_CM))
413 		gtlbe->mas2 &= 0xffffffffUL;
414 	gtlbe->mas7_3 = vcpu->arch.shared->mas7_3;
415 
416 	trace_kvm_booke206_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1,
417 	                              gtlbe->mas2, gtlbe->mas7_3);
418 
419 	if (tlbsel == 1) {
420 		/*
421 		 * If a valid tlb1 entry is overwritten then recalculate the
422 		 * min/max TLB1 map address range otherwise no need to look
423 		 * in tlb1 array.
424 		 */
425 		if (recal)
426 			kvmppc_recalc_tlb1map_range(vcpu_e500);
427 		else
428 			kvmppc_set_tlb1map_range(vcpu, gtlbe);
429 	}
430 
431 	idx = srcu_read_lock(&vcpu->kvm->srcu);
432 
433 	/* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
434 	if (tlbe_is_host_safe(vcpu, gtlbe)) {
435 		u64 eaddr = get_tlb_eaddr(gtlbe);
436 		u64 raddr = get_tlb_raddr(gtlbe);
437 
438 		if (tlbsel == 0) {
439 			gtlbe->mas1 &= ~MAS1_TSIZE(~0);
440 			gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K);
441 		}
442 
443 		/* Premap the faulting page */
444 		kvmppc_mmu_map(vcpu, eaddr, raddr, index_of(tlbsel, esel));
445 	}
446 
447 	srcu_read_unlock(&vcpu->kvm->srcu, idx);
448 
449 	kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS);
450 	return EMULATE_DONE;
451 }
452 
kvmppc_e500_tlb_search(struct kvm_vcpu * vcpu,gva_t eaddr,unsigned int pid,int as)453 static int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
454 				  gva_t eaddr, unsigned int pid, int as)
455 {
456 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
457 	int esel, tlbsel;
458 
459 	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
460 		esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
461 		if (esel >= 0)
462 			return index_of(tlbsel, esel);
463 	}
464 
465 	return -1;
466 }
467 
468 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
kvmppc_core_vcpu_translate(struct kvm_vcpu * vcpu,struct kvm_translation * tr)469 int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
470                                struct kvm_translation *tr)
471 {
472 	int index;
473 	gva_t eaddr;
474 	u8 pid;
475 	u8 as;
476 
477 	eaddr = tr->linear_address;
478 	pid = (tr->linear_address >> 32) & 0xff;
479 	as = (tr->linear_address >> 40) & 0x1;
480 
481 	index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
482 	if (index < 0) {
483 		tr->valid = 0;
484 		return 0;
485 	}
486 
487 	tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
488 	/* XXX what does "writeable" and "usermode" even mean? */
489 	tr->valid = 1;
490 
491 	return 0;
492 }
493 
494 
kvmppc_mmu_itlb_index(struct kvm_vcpu * vcpu,gva_t eaddr)495 int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
496 {
497 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
498 
499 	return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
500 }
501 
kvmppc_mmu_dtlb_index(struct kvm_vcpu * vcpu,gva_t eaddr)502 int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
503 {
504 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
505 
506 	return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
507 }
508 
kvmppc_mmu_itlb_miss(struct kvm_vcpu * vcpu)509 void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
510 {
511 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);
512 
513 	kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.regs.nip, as);
514 }
515 
kvmppc_mmu_dtlb_miss(struct kvm_vcpu * vcpu)516 void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
517 {
518 	unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);
519 
520 	kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
521 }
522 
kvmppc_mmu_xlate(struct kvm_vcpu * vcpu,unsigned int index,gva_t eaddr)523 gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
524 			gva_t eaddr)
525 {
526 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
527 	struct kvm_book3e_206_tlb_entry *gtlbe;
528 	u64 pgmask;
529 
530 	gtlbe = get_entry(vcpu_e500, tlbsel_of(index), esel_of(index));
531 	pgmask = get_tlb_bytes(gtlbe) - 1;
532 
533 	return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
534 }
535 
536 /*****************************************/
537 
free_gtlb(struct kvmppc_vcpu_e500 * vcpu_e500)538 static void free_gtlb(struct kvmppc_vcpu_e500 *vcpu_e500)
539 {
540 	int i;
541 
542 	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
543 	kfree(vcpu_e500->g2h_tlb1_map);
544 	kfree(vcpu_e500->gtlb_priv[0]);
545 	kfree(vcpu_e500->gtlb_priv[1]);
546 
547 	if (vcpu_e500->shared_tlb_pages) {
548 		vfree((void *)(round_down((uintptr_t)vcpu_e500->gtlb_arch,
549 					  PAGE_SIZE)));
550 
551 		for (i = 0; i < vcpu_e500->num_shared_tlb_pages; i++) {
552 			set_page_dirty_lock(vcpu_e500->shared_tlb_pages[i]);
553 			put_page(vcpu_e500->shared_tlb_pages[i]);
554 		}
555 
556 		vcpu_e500->num_shared_tlb_pages = 0;
557 
558 		kfree(vcpu_e500->shared_tlb_pages);
559 		vcpu_e500->shared_tlb_pages = NULL;
560 	} else {
561 		kfree(vcpu_e500->gtlb_arch);
562 	}
563 
564 	vcpu_e500->gtlb_arch = NULL;
565 }
566 
kvmppc_get_sregs_e500_tlb(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)567 void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
568 {
569 	sregs->u.e.mas0 = vcpu->arch.shared->mas0;
570 	sregs->u.e.mas1 = vcpu->arch.shared->mas1;
571 	sregs->u.e.mas2 = vcpu->arch.shared->mas2;
572 	sregs->u.e.mas7_3 = vcpu->arch.shared->mas7_3;
573 	sregs->u.e.mas4 = vcpu->arch.shared->mas4;
574 	sregs->u.e.mas6 = vcpu->arch.shared->mas6;
575 
576 	sregs->u.e.mmucfg = vcpu->arch.mmucfg;
577 	sregs->u.e.tlbcfg[0] = vcpu->arch.tlbcfg[0];
578 	sregs->u.e.tlbcfg[1] = vcpu->arch.tlbcfg[1];
579 	sregs->u.e.tlbcfg[2] = 0;
580 	sregs->u.e.tlbcfg[3] = 0;
581 }
582 
kvmppc_set_sregs_e500_tlb(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)583 int kvmppc_set_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
584 {
585 	if (sregs->u.e.features & KVM_SREGS_E_ARCH206_MMU) {
586 		vcpu->arch.shared->mas0 = sregs->u.e.mas0;
587 		vcpu->arch.shared->mas1 = sregs->u.e.mas1;
588 		vcpu->arch.shared->mas2 = sregs->u.e.mas2;
589 		vcpu->arch.shared->mas7_3 = sregs->u.e.mas7_3;
590 		vcpu->arch.shared->mas4 = sregs->u.e.mas4;
591 		vcpu->arch.shared->mas6 = sregs->u.e.mas6;
592 	}
593 
594 	return 0;
595 }
596 
kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu * vcpu,u64 id,union kvmppc_one_reg * val)597 int kvmppc_get_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
598 				union kvmppc_one_reg *val)
599 {
600 	int r = 0;
601 	long int i;
602 
603 	switch (id) {
604 	case KVM_REG_PPC_MAS0:
605 		*val = get_reg_val(id, vcpu->arch.shared->mas0);
606 		break;
607 	case KVM_REG_PPC_MAS1:
608 		*val = get_reg_val(id, vcpu->arch.shared->mas1);
609 		break;
610 	case KVM_REG_PPC_MAS2:
611 		*val = get_reg_val(id, vcpu->arch.shared->mas2);
612 		break;
613 	case KVM_REG_PPC_MAS7_3:
614 		*val = get_reg_val(id, vcpu->arch.shared->mas7_3);
615 		break;
616 	case KVM_REG_PPC_MAS4:
617 		*val = get_reg_val(id, vcpu->arch.shared->mas4);
618 		break;
619 	case KVM_REG_PPC_MAS6:
620 		*val = get_reg_val(id, vcpu->arch.shared->mas6);
621 		break;
622 	case KVM_REG_PPC_MMUCFG:
623 		*val = get_reg_val(id, vcpu->arch.mmucfg);
624 		break;
625 	case KVM_REG_PPC_EPTCFG:
626 		*val = get_reg_val(id, vcpu->arch.eptcfg);
627 		break;
628 	case KVM_REG_PPC_TLB0CFG:
629 	case KVM_REG_PPC_TLB1CFG:
630 	case KVM_REG_PPC_TLB2CFG:
631 	case KVM_REG_PPC_TLB3CFG:
632 		i = id - KVM_REG_PPC_TLB0CFG;
633 		*val = get_reg_val(id, vcpu->arch.tlbcfg[i]);
634 		break;
635 	case KVM_REG_PPC_TLB0PS:
636 	case KVM_REG_PPC_TLB1PS:
637 	case KVM_REG_PPC_TLB2PS:
638 	case KVM_REG_PPC_TLB3PS:
639 		i = id - KVM_REG_PPC_TLB0PS;
640 		*val = get_reg_val(id, vcpu->arch.tlbps[i]);
641 		break;
642 	default:
643 		r = -EINVAL;
644 		break;
645 	}
646 
647 	return r;
648 }
649 
kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu * vcpu,u64 id,union kvmppc_one_reg * val)650 int kvmppc_set_one_reg_e500_tlb(struct kvm_vcpu *vcpu, u64 id,
651 			       union kvmppc_one_reg *val)
652 {
653 	int r = 0;
654 	long int i;
655 
656 	switch (id) {
657 	case KVM_REG_PPC_MAS0:
658 		vcpu->arch.shared->mas0 = set_reg_val(id, *val);
659 		break;
660 	case KVM_REG_PPC_MAS1:
661 		vcpu->arch.shared->mas1 = set_reg_val(id, *val);
662 		break;
663 	case KVM_REG_PPC_MAS2:
664 		vcpu->arch.shared->mas2 = set_reg_val(id, *val);
665 		break;
666 	case KVM_REG_PPC_MAS7_3:
667 		vcpu->arch.shared->mas7_3 = set_reg_val(id, *val);
668 		break;
669 	case KVM_REG_PPC_MAS4:
670 		vcpu->arch.shared->mas4 = set_reg_val(id, *val);
671 		break;
672 	case KVM_REG_PPC_MAS6:
673 		vcpu->arch.shared->mas6 = set_reg_val(id, *val);
674 		break;
675 	/* Only allow MMU registers to be set to the config supported by KVM */
676 	case KVM_REG_PPC_MMUCFG: {
677 		u32 reg = set_reg_val(id, *val);
678 		if (reg != vcpu->arch.mmucfg)
679 			r = -EINVAL;
680 		break;
681 	}
682 	case KVM_REG_PPC_EPTCFG: {
683 		u32 reg = set_reg_val(id, *val);
684 		if (reg != vcpu->arch.eptcfg)
685 			r = -EINVAL;
686 		break;
687 	}
688 	case KVM_REG_PPC_TLB0CFG:
689 	case KVM_REG_PPC_TLB1CFG:
690 	case KVM_REG_PPC_TLB2CFG:
691 	case KVM_REG_PPC_TLB3CFG: {
692 		/* MMU geometry (N_ENTRY/ASSOC) can be set only using SW_TLB */
693 		u32 reg = set_reg_val(id, *val);
694 		i = id - KVM_REG_PPC_TLB0CFG;
695 		if (reg != vcpu->arch.tlbcfg[i])
696 			r = -EINVAL;
697 		break;
698 	}
699 	case KVM_REG_PPC_TLB0PS:
700 	case KVM_REG_PPC_TLB1PS:
701 	case KVM_REG_PPC_TLB2PS:
702 	case KVM_REG_PPC_TLB3PS: {
703 		u32 reg = set_reg_val(id, *val);
704 		i = id - KVM_REG_PPC_TLB0PS;
705 		if (reg != vcpu->arch.tlbps[i])
706 			r = -EINVAL;
707 		break;
708 	}
709 	default:
710 		r = -EINVAL;
711 		break;
712 	}
713 
714 	return r;
715 }
716 
vcpu_mmu_geometry_update(struct kvm_vcpu * vcpu,struct kvm_book3e_206_tlb_params * params)717 static int vcpu_mmu_geometry_update(struct kvm_vcpu *vcpu,
718 		struct kvm_book3e_206_tlb_params *params)
719 {
720 	vcpu->arch.tlbcfg[0] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
721 	if (params->tlb_sizes[0] <= 2048)
722 		vcpu->arch.tlbcfg[0] |= params->tlb_sizes[0];
723 	vcpu->arch.tlbcfg[0] |= params->tlb_ways[0] << TLBnCFG_ASSOC_SHIFT;
724 
725 	vcpu->arch.tlbcfg[1] &= ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
726 	vcpu->arch.tlbcfg[1] |= params->tlb_sizes[1];
727 	vcpu->arch.tlbcfg[1] |= params->tlb_ways[1] << TLBnCFG_ASSOC_SHIFT;
728 	return 0;
729 }
730 
kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu * vcpu,struct kvm_config_tlb * cfg)731 int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
732 			      struct kvm_config_tlb *cfg)
733 {
734 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
735 	struct kvm_book3e_206_tlb_params params;
736 	char *virt;
737 	struct page **pages;
738 	struct tlbe_priv *privs[2] = {};
739 	u64 *g2h_bitmap;
740 	size_t array_len;
741 	u32 sets;
742 	int num_pages, ret, i;
743 
744 	if (cfg->mmu_type != KVM_MMU_FSL_BOOKE_NOHV)
745 		return -EINVAL;
746 
747 	if (copy_from_user(&params, (void __user *)(uintptr_t)cfg->params,
748 			   sizeof(params)))
749 		return -EFAULT;
750 
751 	if (params.tlb_sizes[1] > 64)
752 		return -EINVAL;
753 	if (params.tlb_ways[1] != params.tlb_sizes[1])
754 		return -EINVAL;
755 	if (params.tlb_sizes[2] != 0 || params.tlb_sizes[3] != 0)
756 		return -EINVAL;
757 	if (params.tlb_ways[2] != 0 || params.tlb_ways[3] != 0)
758 		return -EINVAL;
759 
760 	if (!is_power_of_2(params.tlb_ways[0]))
761 		return -EINVAL;
762 
763 	sets = params.tlb_sizes[0] >> ilog2(params.tlb_ways[0]);
764 	if (!is_power_of_2(sets))
765 		return -EINVAL;
766 
767 	array_len = params.tlb_sizes[0] + params.tlb_sizes[1];
768 	array_len *= sizeof(struct kvm_book3e_206_tlb_entry);
769 
770 	if (cfg->array_len < array_len)
771 		return -EINVAL;
772 
773 	num_pages = DIV_ROUND_UP(cfg->array + array_len - 1, PAGE_SIZE) -
774 		    cfg->array / PAGE_SIZE;
775 	pages = kmalloc_array(num_pages, sizeof(*pages), GFP_KERNEL);
776 	if (!pages)
777 		return -ENOMEM;
778 
779 	ret = get_user_pages_fast(cfg->array, num_pages, FOLL_WRITE, pages);
780 	if (ret < 0)
781 		goto free_pages;
782 
783 	if (ret != num_pages) {
784 		num_pages = ret;
785 		ret = -EFAULT;
786 		goto put_pages;
787 	}
788 
789 	virt = vmap(pages, num_pages, VM_MAP, PAGE_KERNEL);
790 	if (!virt) {
791 		ret = -ENOMEM;
792 		goto put_pages;
793 	}
794 
795 	privs[0] = kcalloc(params.tlb_sizes[0], sizeof(*privs[0]), GFP_KERNEL);
796 	if (!privs[0]) {
797 		ret = -ENOMEM;
798 		goto put_pages;
799 	}
800 
801 	privs[1] = kcalloc(params.tlb_sizes[1], sizeof(*privs[1]), GFP_KERNEL);
802 	if (!privs[1]) {
803 		ret = -ENOMEM;
804 		goto free_privs_first;
805 	}
806 
807 	g2h_bitmap = kcalloc(params.tlb_sizes[1],
808 			     sizeof(*g2h_bitmap),
809 			     GFP_KERNEL);
810 	if (!g2h_bitmap) {
811 		ret = -ENOMEM;
812 		goto free_privs_second;
813 	}
814 
815 	free_gtlb(vcpu_e500);
816 
817 	vcpu_e500->gtlb_priv[0] = privs[0];
818 	vcpu_e500->gtlb_priv[1] = privs[1];
819 	vcpu_e500->g2h_tlb1_map = g2h_bitmap;
820 
821 	vcpu_e500->gtlb_arch = (struct kvm_book3e_206_tlb_entry *)
822 		(virt + (cfg->array & (PAGE_SIZE - 1)));
823 
824 	vcpu_e500->gtlb_params[0].entries = params.tlb_sizes[0];
825 	vcpu_e500->gtlb_params[1].entries = params.tlb_sizes[1];
826 
827 	vcpu_e500->gtlb_offset[0] = 0;
828 	vcpu_e500->gtlb_offset[1] = params.tlb_sizes[0];
829 
830 	/* Update vcpu's MMU geometry based on SW_TLB input */
831 	vcpu_mmu_geometry_update(vcpu, &params);
832 
833 	vcpu_e500->shared_tlb_pages = pages;
834 	vcpu_e500->num_shared_tlb_pages = num_pages;
835 
836 	vcpu_e500->gtlb_params[0].ways = params.tlb_ways[0];
837 	vcpu_e500->gtlb_params[0].sets = sets;
838 
839 	vcpu_e500->gtlb_params[1].ways = params.tlb_sizes[1];
840 	vcpu_e500->gtlb_params[1].sets = 1;
841 
842 	kvmppc_recalc_tlb1map_range(vcpu_e500);
843 	return 0;
844  free_privs_second:
845 	kfree(privs[1]);
846  free_privs_first:
847 	kfree(privs[0]);
848  put_pages:
849 	for (i = 0; i < num_pages; i++)
850 		put_page(pages[i]);
851  free_pages:
852 	kfree(pages);
853 	return ret;
854 }
855 
kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu * vcpu,struct kvm_dirty_tlb * dirty)856 int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu,
857 			     struct kvm_dirty_tlb *dirty)
858 {
859 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
860 	kvmppc_recalc_tlb1map_range(vcpu_e500);
861 	kvmppc_core_flush_tlb(vcpu);
862 	return 0;
863 }
864 
865 /* Vcpu's MMU default configuration */
vcpu_mmu_init(struct kvm_vcpu * vcpu,struct kvmppc_e500_tlb_params * params)866 static int vcpu_mmu_init(struct kvm_vcpu *vcpu,
867 		       struct kvmppc_e500_tlb_params *params)
868 {
869 	/* Initialize RASIZE, PIDSIZE, NTLBS and MAVN fields with host values*/
870 	vcpu->arch.mmucfg = mfspr(SPRN_MMUCFG) & ~MMUCFG_LPIDSIZE;
871 
872 	/* Initialize TLBnCFG fields with host values and SW_TLB geometry*/
873 	vcpu->arch.tlbcfg[0] = mfspr(SPRN_TLB0CFG) &
874 			     ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
875 	vcpu->arch.tlbcfg[0] |= params[0].entries;
876 	vcpu->arch.tlbcfg[0] |= params[0].ways << TLBnCFG_ASSOC_SHIFT;
877 
878 	vcpu->arch.tlbcfg[1] = mfspr(SPRN_TLB1CFG) &
879 			     ~(TLBnCFG_N_ENTRY | TLBnCFG_ASSOC);
880 	vcpu->arch.tlbcfg[1] |= params[1].entries;
881 	vcpu->arch.tlbcfg[1] |= params[1].ways << TLBnCFG_ASSOC_SHIFT;
882 
883 	if (has_feature(vcpu, VCPU_FTR_MMU_V2)) {
884 		vcpu->arch.tlbps[0] = mfspr(SPRN_TLB0PS);
885 		vcpu->arch.tlbps[1] = mfspr(SPRN_TLB1PS);
886 
887 		vcpu->arch.mmucfg &= ~MMUCFG_LRAT;
888 
889 		/* Guest mmu emulation currently doesn't handle E.PT */
890 		vcpu->arch.eptcfg = 0;
891 		vcpu->arch.tlbcfg[0] &= ~TLBnCFG_PT;
892 		vcpu->arch.tlbcfg[1] &= ~TLBnCFG_IND;
893 	}
894 
895 	return 0;
896 }
897 
kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 * vcpu_e500)898 int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
899 {
900 	struct kvm_vcpu *vcpu = &vcpu_e500->vcpu;
901 
902 	if (e500_mmu_host_init(vcpu_e500))
903 		goto free_vcpu;
904 
905 	vcpu_e500->gtlb_params[0].entries = KVM_E500_TLB0_SIZE;
906 	vcpu_e500->gtlb_params[1].entries = KVM_E500_TLB1_SIZE;
907 
908 	vcpu_e500->gtlb_params[0].ways = KVM_E500_TLB0_WAY_NUM;
909 	vcpu_e500->gtlb_params[0].sets =
910 		KVM_E500_TLB0_SIZE / KVM_E500_TLB0_WAY_NUM;
911 
912 	vcpu_e500->gtlb_params[1].ways = KVM_E500_TLB1_SIZE;
913 	vcpu_e500->gtlb_params[1].sets = 1;
914 
915 	vcpu_e500->gtlb_arch = kmalloc_array(KVM_E500_TLB0_SIZE +
916 					     KVM_E500_TLB1_SIZE,
917 					     sizeof(*vcpu_e500->gtlb_arch),
918 					     GFP_KERNEL);
919 	if (!vcpu_e500->gtlb_arch)
920 		return -ENOMEM;
921 
922 	vcpu_e500->gtlb_offset[0] = 0;
923 	vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE;
924 
925 	vcpu_e500->gtlb_priv[0] = kcalloc(vcpu_e500->gtlb_params[0].entries,
926 					  sizeof(struct tlbe_ref),
927 					  GFP_KERNEL);
928 	if (!vcpu_e500->gtlb_priv[0])
929 		goto free_vcpu;
930 
931 	vcpu_e500->gtlb_priv[1] = kcalloc(vcpu_e500->gtlb_params[1].entries,
932 					  sizeof(struct tlbe_ref),
933 					  GFP_KERNEL);
934 	if (!vcpu_e500->gtlb_priv[1])
935 		goto free_vcpu;
936 
937 	vcpu_e500->g2h_tlb1_map = kcalloc(vcpu_e500->gtlb_params[1].entries,
938 					  sizeof(*vcpu_e500->g2h_tlb1_map),
939 					  GFP_KERNEL);
940 	if (!vcpu_e500->g2h_tlb1_map)
941 		goto free_vcpu;
942 
943 	vcpu_mmu_init(vcpu, vcpu_e500->gtlb_params);
944 
945 	kvmppc_recalc_tlb1map_range(vcpu_e500);
946 	return 0;
947  free_vcpu:
948 	free_gtlb(vcpu_e500);
949 	return -1;
950 }
951 
kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 * vcpu_e500)952 void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
953 {
954 	free_gtlb(vcpu_e500);
955 	e500_mmu_host_uninit(vcpu_e500);
956 }
957