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1/*
2 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
3 *
4 * Authors:
5 * Alexander Graf <agraf@suse.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2, as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21#include <linux/kvm_host.h>
22
23#include <asm/kvm_ppc.h>
24#include <asm/kvm_book3s.h>
25#include <asm/mmu-hash32.h>
26#include <asm/machdep.h>
27#include <asm/mmu_context.h>
28#include <asm/hw_irq.h>
29
30/* #define DEBUG_MMU */
31/* #define DEBUG_SR */
32
33#ifdef DEBUG_MMU
34#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
35#else
36#define dprintk_mmu(a, ...) do { } while(0)
37#endif
38
39#ifdef DEBUG_SR
40#define dprintk_sr(a, ...) printk(KERN_INFO a, __VA_ARGS__)
41#else
42#define dprintk_sr(a, ...) do { } while(0)
43#endif
44
45#if PAGE_SHIFT != 12
46#error Unknown page size
47#endif
48
49#ifdef CONFIG_SMP
50#error XXX need to grab mmu_hash_lock
51#endif
52
53#ifdef CONFIG_PTE_64BIT
54#error Only 32 bit pages are supported for now
55#endif
56
57static ulong htab;
58static u32 htabmask;
59
60void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
61{
62 volatile u32 *pteg;
63
64 /* Remove from host HTAB */
65 pteg = (u32*)pte->slot;
66 pteg[0] = 0;
67
68 /* And make sure it's gone from the TLB too */
69 asm volatile ("sync");
70 asm volatile ("tlbie %0" : : "r" (pte->pte.eaddr) : "memory");
71 asm volatile ("sync");
72 asm volatile ("tlbsync");
73}
74
75/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
76 * a hash, so we don't waste cycles on looping */
77static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
78{
79 return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
80 ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
81 ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
82 ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
83 ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
84 ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
85 ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
86 ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
87}
88
89
90static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
91{
92 struct kvmppc_sid_map *map;
93 u16 sid_map_mask;
94
95 if (vcpu->arch.shared->msr & MSR_PR)
96 gvsid |= VSID_PR;
97
98 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
99 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
100 if (map->guest_vsid == gvsid) {
101 dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n",
102 gvsid, map->host_vsid);
103 return map;
104 }
105
106 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
107 if (map->guest_vsid == gvsid) {
108 dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n",
109 gvsid, map->host_vsid);
110 return map;
111 }
112
113 dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid);
114 return NULL;
115}
116
117static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr,
118 bool primary)
119{
120 u32 page, hash;
121 ulong pteg = htab;
122
123 page = (eaddr & ~ESID_MASK) >> 12;
124
125 hash = ((vsid ^ page) << 6);
126 if (!primary)
127 hash = ~hash;
128
129 hash &= htabmask;
130
131 pteg |= hash;
132
133 dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n",
134 htab, hash, htabmask, pteg);
135
136 return (u32*)pteg;
137}
138
139extern char etext[];
140
141int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
142{
143 pfn_t hpaddr;
144 u64 va;
145 u64 vsid;
146 struct kvmppc_sid_map *map;
147 volatile u32 *pteg;
148 u32 eaddr = orig_pte->eaddr;
149 u32 pteg0, pteg1;
150 register int rr = 0;
151 bool primary = false;
152 bool evict = false;
153 struct hpte_cache *pte;
154 int r = 0;
155
156 /* Get host physical address for gpa */
157 hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT);
158 if (is_error_pfn(hpaddr)) {
159 printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n",
160 orig_pte->eaddr);
161 r = -EINVAL;
162 goto out;
163 }
164 hpaddr <<= PAGE_SHIFT;
165
166 /* and write the mapping ea -> hpa into the pt */
167 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
168 map = find_sid_vsid(vcpu, vsid);
169 if (!map) {
170 kvmppc_mmu_map_segment(vcpu, eaddr);
171 map = find_sid_vsid(vcpu, vsid);
172 }
173 BUG_ON(!map);
174
175 vsid = map->host_vsid;
176 va = (vsid << SID_SHIFT) | (eaddr & ~ESID_MASK);
177
178next_pteg:
179 if (rr == 16) {
180 primary = !primary;
181 evict = true;
182 rr = 0;
183 }
184
185 pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary);
186
187 /* not evicting yet */
188 if (!evict && (pteg[rr] & PTE_V)) {
189 rr += 2;
190 goto next_pteg;
191 }
192
193 dprintk_mmu("KVM: old PTEG: %p (%d)\n", pteg, rr);
194 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
195 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
196 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
197 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
198 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
199 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
200 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
201 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
202
203 pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V |
204 (primary ? 0 : PTE_SEC);
205 pteg1 = hpaddr | PTE_M | PTE_R | PTE_C;
206
207 if (orig_pte->may_write) {
208 pteg1 |= PP_RWRW;
209 mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
210 } else {
211 pteg1 |= PP_RWRX;
212 }
213
214 local_irq_disable();
215
216 if (pteg[rr]) {
217 pteg[rr] = 0;
218 asm volatile ("sync");
219 }
220 pteg[rr + 1] = pteg1;
221 pteg[rr] = pteg0;
222 asm volatile ("sync");
223
224 local_irq_enable();
225
226 dprintk_mmu("KVM: new PTEG: %p\n", pteg);
227 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
228 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
229 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
230 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
231 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
232 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
233 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
234 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
235
236
237 /* Now tell our Shadow PTE code about the new page */
238
239 pte = kvmppc_mmu_hpte_cache_next(vcpu);
240
241 dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
242 orig_pte->may_write ? 'w' : '-',
243 orig_pte->may_execute ? 'x' : '-',
244 orig_pte->eaddr, (ulong)pteg, va,
245 orig_pte->vpage, hpaddr);
246
247 pte->slot = (ulong)&pteg[rr];
248 pte->host_va = va;
249 pte->pte = *orig_pte;
250 pte->pfn = hpaddr >> PAGE_SHIFT;
251
252 kvmppc_mmu_hpte_cache_map(vcpu, pte);
253
254out:
255 return r;
256}
257
258static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
259{
260 struct kvmppc_sid_map *map;
261 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
262 u16 sid_map_mask;
263 static int backwards_map = 0;
264
265 if (vcpu->arch.shared->msr & MSR_PR)
266 gvsid |= VSID_PR;
267
268 /* We might get collisions that trap in preceding order, so let's
269 map them differently */
270
271 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
272 if (backwards_map)
273 sid_map_mask = SID_MAP_MASK - sid_map_mask;
274
275 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
276
277 /* Make sure we're taking the other map next time */
278 backwards_map = !backwards_map;
279
280 /* Uh-oh ... out of mappings. Let's flush! */
281 if (vcpu_book3s->vsid_next >= VSID_POOL_SIZE) {
282 vcpu_book3s->vsid_next = 0;
283 memset(vcpu_book3s->sid_map, 0,
284 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
285 kvmppc_mmu_pte_flush(vcpu, 0, 0);
286 kvmppc_mmu_flush_segments(vcpu);
287 }
288 map->host_vsid = vcpu_book3s->vsid_pool[vcpu_book3s->vsid_next];
289 vcpu_book3s->vsid_next++;
290
291 map->guest_vsid = gvsid;
292 map->valid = true;
293
294 return map;
295}
296
297int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
298{
299 u32 esid = eaddr >> SID_SHIFT;
300 u64 gvsid;
301 u32 sr;
302 struct kvmppc_sid_map *map;
303 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
304 int r = 0;
305
306 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
307 /* Invalidate an entry */
308 svcpu->sr[esid] = SR_INVALID;
309 r = -ENOENT;
310 goto out;
311 }
312
313 map = find_sid_vsid(vcpu, gvsid);
314 if (!map)
315 map = create_sid_map(vcpu, gvsid);
316
317 map->guest_esid = esid;
318 sr = map->host_vsid | SR_KP;
319 svcpu->sr[esid] = sr;
320
321 dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr);
322
323out:
324 svcpu_put(svcpu);
325 return r;
326}
327
328void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
329{
330 int i;
331 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
332
333 dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr));
334 for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++)
335 svcpu->sr[i] = SR_INVALID;
336
337 svcpu_put(svcpu);
338}
339
340void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
341{
342 int i;
343
344 kvmppc_mmu_hpte_destroy(vcpu);
345 preempt_disable();
346 for (i = 0; i < SID_CONTEXTS; i++)
347 __destroy_context(to_book3s(vcpu)->context_id[i]);
348 preempt_enable();
349}
350
351/* From mm/mmu_context_hash32.c */
352#define CTX_TO_VSID(c, id) ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)
353
354int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
355{
356 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
357 int err;
358 ulong sdr1;
359 int i;
360 int j;
361
362 for (i = 0; i < SID_CONTEXTS; i++) {
363 err = __init_new_context();
364 if (err < 0)
365 goto init_fail;
366 vcpu3s->context_id[i] = err;
367
368 /* Remember context id for this combination */
369 for (j = 0; j < 16; j++)
370 vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j);
371 }
372
373 vcpu3s->vsid_next = 0;
374
375 /* Remember where the HTAB is */
376 asm ( "mfsdr1 %0" : "=r"(sdr1) );
377 htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0;
378 htab = (ulong)__va(sdr1 & 0xffff0000);
379
380 kvmppc_mmu_hpte_init(vcpu);
381
382 return 0;
383
384init_fail:
385 for (j = 0; j < i; j++) {
386 if (!vcpu3s->context_id[j])
387 continue;
388
389 __destroy_context(to_book3s(vcpu)->context_id[j]);
390 }
391
392 return -1;
393}