1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
4  *
5  * Authors:
6  *     Alexander Graf <agraf@suse.de>
7  */
8 
9 #include <linux/kvm_host.h>
10 #include <linux/hash.h>
11 #include <linux/slab.h>
12 #include <linux/rculist.h>
13 
14 #include <asm/kvm_ppc.h>
15 #include <asm/kvm_book3s.h>
16 #include <asm/machdep.h>
17 #include <asm/mmu_context.h>
18 #include <asm/hw_irq.h>
19 
20 #include "trace_pr.h"
21 
22 #define PTE_SIZE	12
23 
24 static struct kmem_cache *hpte_cache;
25 
26 static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
27 {
28 	return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
29 }
30 
31 static inline u64 kvmppc_mmu_hash_pte_long(u64 eaddr)
32 {
33 	return hash_64((eaddr & 0x0ffff000) >> PTE_SIZE,
34 		       HPTEG_HASH_BITS_PTE_LONG);
35 }
36 
37 static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
38 {
39 	return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
40 }
41 
42 static inline u64 kvmppc_mmu_hash_vpte_long(u64 vpage)
43 {
44 	return hash_64((vpage & 0xffffff000ULL) >> 12,
45 		       HPTEG_HASH_BITS_VPTE_LONG);
46 }
47 
48 #ifdef CONFIG_PPC_BOOK3S_64
49 static inline u64 kvmppc_mmu_hash_vpte_64k(u64 vpage)
50 {
51 	return hash_64((vpage & 0xffffffff0ULL) >> 4,
52 		       HPTEG_HASH_BITS_VPTE_64K);
53 }
54 #endif
55 
56 void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
57 {
58 	u64 index;
59 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
60 
61 	trace_kvm_book3s_mmu_map(pte);
62 
63 	spin_lock(&vcpu3s->mmu_lock);
64 
65 	/* Add to ePTE list */
66 	index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
67 	hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);
68 
69 	/* Add to ePTE_long list */
70 	index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
71 	hlist_add_head_rcu(&pte->list_pte_long,
72 			   &vcpu3s->hpte_hash_pte_long[index]);
73 
74 	/* Add to vPTE list */
75 	index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
76 	hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);
77 
78 	/* Add to vPTE_long list */
79 	index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
80 	hlist_add_head_rcu(&pte->list_vpte_long,
81 			   &vcpu3s->hpte_hash_vpte_long[index]);
82 
83 #ifdef CONFIG_PPC_BOOK3S_64
84 	/* Add to vPTE_64k list */
85 	index = kvmppc_mmu_hash_vpte_64k(pte->pte.vpage);
86 	hlist_add_head_rcu(&pte->list_vpte_64k,
87 			   &vcpu3s->hpte_hash_vpte_64k[index]);
88 #endif
89 
90 	vcpu3s->hpte_cache_count++;
91 
92 	spin_unlock(&vcpu3s->mmu_lock);
93 }
94 
95 static void free_pte_rcu(struct rcu_head *head)
96 {
97 	struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
98 	kmem_cache_free(hpte_cache, pte);
99 }
100 
101 static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
102 {
103 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
104 
105 	trace_kvm_book3s_mmu_invalidate(pte);
106 
107 	/* Different for 32 and 64 bit */
108 	kvmppc_mmu_invalidate_pte(vcpu, pte);
109 
110 	spin_lock(&vcpu3s->mmu_lock);
111 
112 	/* pte already invalidated in between? */
113 	if (hlist_unhashed(&pte->list_pte)) {
114 		spin_unlock(&vcpu3s->mmu_lock);
115 		return;
116 	}
117 
118 	hlist_del_init_rcu(&pte->list_pte);
119 	hlist_del_init_rcu(&pte->list_pte_long);
120 	hlist_del_init_rcu(&pte->list_vpte);
121 	hlist_del_init_rcu(&pte->list_vpte_long);
122 #ifdef CONFIG_PPC_BOOK3S_64
123 	hlist_del_init_rcu(&pte->list_vpte_64k);
124 #endif
125 	vcpu3s->hpte_cache_count--;
126 
127 	spin_unlock(&vcpu3s->mmu_lock);
128 
129 	call_rcu(&pte->rcu_head, free_pte_rcu);
130 }
131 
132 static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
133 {
134 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
135 	struct hpte_cache *pte;
136 	int i;
137 
138 	rcu_read_lock();
139 
140 	for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
141 		struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
142 
143 		hlist_for_each_entry_rcu(pte, list, list_vpte_long)
144 			invalidate_pte(vcpu, pte);
145 	}
146 
147 	rcu_read_unlock();
148 }
149 
150 static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
151 {
152 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
153 	struct hlist_head *list;
154 	struct hpte_cache *pte;
155 
156 	/* Find the list of entries in the map */
157 	list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];
158 
159 	rcu_read_lock();
160 
161 	/* Check the list for matching entries and invalidate */
162 	hlist_for_each_entry_rcu(pte, list, list_pte)
163 		if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
164 			invalidate_pte(vcpu, pte);
165 
166 	rcu_read_unlock();
167 }
168 
169 static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
170 {
171 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
172 	struct hlist_head *list;
173 	struct hpte_cache *pte;
174 
175 	/* Find the list of entries in the map */
176 	list = &vcpu3s->hpte_hash_pte_long[
177 			kvmppc_mmu_hash_pte_long(guest_ea)];
178 
179 	rcu_read_lock();
180 
181 	/* Check the list for matching entries and invalidate */
182 	hlist_for_each_entry_rcu(pte, list, list_pte_long)
183 		if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
184 			invalidate_pte(vcpu, pte);
185 
186 	rcu_read_unlock();
187 }
188 
189 void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
190 {
191 	trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
192 	guest_ea &= ea_mask;
193 
194 	switch (ea_mask) {
195 	case ~0xfffUL:
196 		kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
197 		break;
198 	case 0x0ffff000:
199 		kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
200 		break;
201 	case 0:
202 		/* Doing a complete flush -> start from scratch */
203 		kvmppc_mmu_pte_flush_all(vcpu);
204 		break;
205 	default:
206 		WARN_ON(1);
207 		break;
208 	}
209 }
210 
211 /* Flush with mask 0xfffffffff */
212 static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
213 {
214 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
215 	struct hlist_head *list;
216 	struct hpte_cache *pte;
217 	u64 vp_mask = 0xfffffffffULL;
218 
219 	list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];
220 
221 	rcu_read_lock();
222 
223 	/* Check the list for matching entries and invalidate */
224 	hlist_for_each_entry_rcu(pte, list, list_vpte)
225 		if ((pte->pte.vpage & vp_mask) == guest_vp)
226 			invalidate_pte(vcpu, pte);
227 
228 	rcu_read_unlock();
229 }
230 
231 #ifdef CONFIG_PPC_BOOK3S_64
232 /* Flush with mask 0xffffffff0 */
233 static void kvmppc_mmu_pte_vflush_64k(struct kvm_vcpu *vcpu, u64 guest_vp)
234 {
235 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
236 	struct hlist_head *list;
237 	struct hpte_cache *pte;
238 	u64 vp_mask = 0xffffffff0ULL;
239 
240 	list = &vcpu3s->hpte_hash_vpte_64k[
241 		kvmppc_mmu_hash_vpte_64k(guest_vp)];
242 
243 	rcu_read_lock();
244 
245 	/* Check the list for matching entries and invalidate */
246 	hlist_for_each_entry_rcu(pte, list, list_vpte_64k)
247 		if ((pte->pte.vpage & vp_mask) == guest_vp)
248 			invalidate_pte(vcpu, pte);
249 
250 	rcu_read_unlock();
251 }
252 #endif
253 
254 /* Flush with mask 0xffffff000 */
255 static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
256 {
257 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
258 	struct hlist_head *list;
259 	struct hpte_cache *pte;
260 	u64 vp_mask = 0xffffff000ULL;
261 
262 	list = &vcpu3s->hpte_hash_vpte_long[
263 		kvmppc_mmu_hash_vpte_long(guest_vp)];
264 
265 	rcu_read_lock();
266 
267 	/* Check the list for matching entries and invalidate */
268 	hlist_for_each_entry_rcu(pte, list, list_vpte_long)
269 		if ((pte->pte.vpage & vp_mask) == guest_vp)
270 			invalidate_pte(vcpu, pte);
271 
272 	rcu_read_unlock();
273 }
274 
275 void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
276 {
277 	trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
278 	guest_vp &= vp_mask;
279 
280 	switch(vp_mask) {
281 	case 0xfffffffffULL:
282 		kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
283 		break;
284 #ifdef CONFIG_PPC_BOOK3S_64
285 	case 0xffffffff0ULL:
286 		kvmppc_mmu_pte_vflush_64k(vcpu, guest_vp);
287 		break;
288 #endif
289 	case 0xffffff000ULL:
290 		kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
291 		break;
292 	default:
293 		WARN_ON(1);
294 		return;
295 	}
296 }
297 
298 void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
299 {
300 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
301 	struct hpte_cache *pte;
302 	int i;
303 
304 	trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);
305 
306 	rcu_read_lock();
307 
308 	for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
309 		struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
310 
311 		hlist_for_each_entry_rcu(pte, list, list_vpte_long)
312 			if ((pte->pte.raddr >= pa_start) &&
313 			    (pte->pte.raddr < pa_end))
314 				invalidate_pte(vcpu, pte);
315 	}
316 
317 	rcu_read_unlock();
318 }
319 
320 struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
321 {
322 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
323 	struct hpte_cache *pte;
324 
325 	if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
326 		kvmppc_mmu_pte_flush_all(vcpu);
327 
328 	pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
329 
330 	return pte;
331 }
332 
333 void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte)
334 {
335 	kmem_cache_free(hpte_cache, pte);
336 }
337 
338 void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
339 {
340 	kvmppc_mmu_pte_flush(vcpu, 0, 0);
341 }
342 
343 static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
344 {
345 	int i;
346 
347 	for (i = 0; i < len; i++)
348 		INIT_HLIST_HEAD(&hash_list[i]);
349 }
350 
351 int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
352 {
353 	struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
354 
355 	/* init hpte lookup hashes */
356 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
357 				  ARRAY_SIZE(vcpu3s->hpte_hash_pte));
358 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
359 				  ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
360 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
361 				  ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
362 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
363 				  ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));
364 #ifdef CONFIG_PPC_BOOK3S_64
365 	kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_64k,
366 				  ARRAY_SIZE(vcpu3s->hpte_hash_vpte_64k));
367 #endif
368 
369 	spin_lock_init(&vcpu3s->mmu_lock);
370 
371 	return 0;
372 }
373 
374 int kvmppc_mmu_hpte_sysinit(void)
375 {
376 	/* init hpte slab cache */
377 	hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
378 				       sizeof(struct hpte_cache), 0, NULL);
379 
380 	return 0;
381 }
382 
383 void kvmppc_mmu_hpte_sysexit(void)
384 {
385 	kmem_cache_destroy(hpte_cache);
386 }
387