blob: fa2f08434ba5c5c867166262388c8dab0a86aca1 [file] [log] [blame]
Alexander Graf0d8dc682009-10-30 05:47:11 +00001/*
2 * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
3 *
4 * Authors:
5 * Alexander Graf <agraf@suse.de>
6 * Kevin Wolf <mail@kevin-wolf.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License, version 2, as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 */
21
22#include <linux/kvm_host.h>
23
24#include <asm/kvm_ppc.h>
25#include <asm/kvm_book3s.h>
26#include <asm/mmu-hash64.h>
27#include <asm/machdep.h>
28#include <asm/mmu_context.h>
29#include <asm/hw_irq.h>
Alexander Graf82fdee72010-08-02 11:38:54 +020030#include "trace.h"
Alexander Graf0d8dc682009-10-30 05:47:11 +000031
32#define PTE_SIZE 12
Alexander Graf0d8dc682009-10-30 05:47:11 +000033
Alexander Graffef093be2010-06-30 15:18:46 +020034void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
Alexander Graf0d8dc682009-10-30 05:47:11 +000035{
Alexander Graf0d8dc682009-10-30 05:47:11 +000036 ppc_md.hpte_invalidate(pte->slot, pte->host_va,
37 MMU_PAGE_4K, MMU_SEGSIZE_256M,
38 false);
Alexander Graf0d8dc682009-10-30 05:47:11 +000039}
40
41/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
42 * a hash, so we don't waste cycles on looping */
43static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
44{
Alexander Grafb9877ce2010-08-02 21:48:53 +020045 return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
46 ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
47 ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
48 ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
49 ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
50 ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
51 ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
52 ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
Alexander Graf0d8dc682009-10-30 05:47:11 +000053}
54
Alexander Grafb9877ce2010-08-02 21:48:53 +020055
Alexander Graf0d8dc682009-10-30 05:47:11 +000056static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
57{
58 struct kvmppc_sid_map *map;
59 u16 sid_map_mask;
60
Alexander Graf666e7252010-07-29 14:47:43 +020061 if (vcpu->arch.shared->msr & MSR_PR)
Alexander Graf0d8dc682009-10-30 05:47:11 +000062 gvsid |= VSID_PR;
63
64 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
65 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
Alexander Grafc22c3192010-08-02 13:38:18 +020066 if (map->valid && (map->guest_vsid == gvsid)) {
Alexander Graf928d78b2010-08-02 21:25:33 +020067 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
Alexander Graf0d8dc682009-10-30 05:47:11 +000068 return map;
69 }
70
71 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
Alexander Grafc22c3192010-08-02 13:38:18 +020072 if (map->valid && (map->guest_vsid == gvsid)) {
Alexander Graf928d78b2010-08-02 21:25:33 +020073 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
Alexander Graf0d8dc682009-10-30 05:47:11 +000074 return map;
75 }
76
Alexander Graf928d78b2010-08-02 21:25:33 +020077 trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
Alexander Graf0d8dc682009-10-30 05:47:11 +000078 return NULL;
79}
80
81int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
82{
83 pfn_t hpaddr;
84 ulong hash, hpteg, va;
85 u64 vsid;
86 int ret;
87 int rflags = 0x192;
88 int vflags = 0;
89 int attempt = 0;
90 struct kvmppc_sid_map *map;
91
92 /* Get host physical address for gpa */
Alexander Grafe8508942010-07-29 14:47:54 +020093 hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT);
Gleb Natapov49451382010-07-29 15:04:18 +020094 if (is_error_pfn(hpaddr)) {
Alexander Grafaf7b4d12010-04-20 02:49:46 +020095 printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr);
Alexander Graf0d8dc682009-10-30 05:47:11 +000096 return -EINVAL;
97 }
98 hpaddr <<= PAGE_SHIFT;
Alexander Grafe8508942010-07-29 14:47:54 +020099 hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
Alexander Graf0d8dc682009-10-30 05:47:11 +0000100
101 /* and write the mapping ea -> hpa into the pt */
102 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
103 map = find_sid_vsid(vcpu, vsid);
104 if (!map) {
Alexander Grafac214672010-04-20 02:49:50 +0200105 ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
106 WARN_ON(ret < 0);
Alexander Graf0d8dc682009-10-30 05:47:11 +0000107 map = find_sid_vsid(vcpu, vsid);
108 }
Alexander Grafac214672010-04-20 02:49:50 +0200109 if (!map) {
110 printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
111 vsid, orig_pte->eaddr);
112 WARN_ON(true);
113 return -EINVAL;
114 }
Alexander Graf0d8dc682009-10-30 05:47:11 +0000115
116 vsid = map->host_vsid;
117 va = hpt_va(orig_pte->eaddr, vsid, MMU_SEGSIZE_256M);
118
119 if (!orig_pte->may_write)
120 rflags |= HPTE_R_PP;
121 else
122 mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
123
124 if (!orig_pte->may_execute)
125 rflags |= HPTE_R_N;
126
127 hash = hpt_hash(va, PTE_SIZE, MMU_SEGSIZE_256M);
128
129map_again:
130 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
131
132 /* In case we tried normal mapping already, let's nuke old entries */
133 if (attempt > 1)
134 if (ppc_md.hpte_remove(hpteg) < 0)
135 return -1;
136
137 ret = ppc_md.hpte_insert(hpteg, va, hpaddr, rflags, vflags, MMU_PAGE_4K, MMU_SEGSIZE_256M);
138
139 if (ret < 0) {
140 /* If we couldn't map a primary PTE, try a secondary */
Alexander Graf0d8dc682009-10-30 05:47:11 +0000141 hash = ~hash;
Alexander Graf20a340a2010-02-19 11:00:46 +0100142 vflags ^= HPTE_V_SECONDARY;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000143 attempt++;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000144 goto map_again;
145 } else {
Alexander Graffef093be2010-06-30 15:18:46 +0200146 struct hpte_cache *pte = kvmppc_mmu_hpte_cache_next(vcpu);
Alexander Graf0d8dc682009-10-30 05:47:11 +0000147
Alexander Graf82fdee72010-08-02 11:38:54 +0200148 trace_kvm_book3s_64_mmu_map(rflags, hpteg, va, hpaddr, orig_pte);
Alexander Graf0d8dc682009-10-30 05:47:11 +0000149
Alexander Grafa1eda282010-03-24 21:48:34 +0100150 /* The ppc_md code may give us a secondary entry even though we
151 asked for a primary. Fix up. */
152 if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
153 hash = ~hash;
154 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
155 }
156
Alexander Graf0d8dc682009-10-30 05:47:11 +0000157 pte->slot = hpteg + (ret & 7);
158 pte->host_va = va;
159 pte->pte = *orig_pte;
160 pte->pfn = hpaddr >> PAGE_SHIFT;
Alexander Graffef093be2010-06-30 15:18:46 +0200161
162 kvmppc_mmu_hpte_cache_map(vcpu, pte);
Alexander Graf0d8dc682009-10-30 05:47:11 +0000163 }
164
165 return 0;
166}
167
168static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
169{
170 struct kvmppc_sid_map *map;
171 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
172 u16 sid_map_mask;
173 static int backwards_map = 0;
174
Alexander Graf666e7252010-07-29 14:47:43 +0200175 if (vcpu->arch.shared->msr & MSR_PR)
Alexander Graf0d8dc682009-10-30 05:47:11 +0000176 gvsid |= VSID_PR;
177
178 /* We might get collisions that trap in preceding order, so let's
179 map them differently */
180
181 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
182 if (backwards_map)
183 sid_map_mask = SID_MAP_MASK - sid_map_mask;
184
185 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
186
187 /* Make sure we're taking the other map next time */
188 backwards_map = !backwards_map;
189
190 /* Uh-oh ... out of mappings. Let's flush! */
191 if (vcpu_book3s->vsid_next == vcpu_book3s->vsid_max) {
192 vcpu_book3s->vsid_next = vcpu_book3s->vsid_first;
193 memset(vcpu_book3s->sid_map, 0,
194 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
195 kvmppc_mmu_pte_flush(vcpu, 0, 0);
196 kvmppc_mmu_flush_segments(vcpu);
197 }
198 map->host_vsid = vcpu_book3s->vsid_next++;
199
200 map->guest_vsid = gvsid;
201 map->valid = true;
202
Alexander Graf928d78b2010-08-02 21:25:33 +0200203 trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);
Alexander Graf5156f272010-04-20 02:49:52 +0200204
Alexander Graf0d8dc682009-10-30 05:47:11 +0000205 return map;
206}
207
208static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
209{
210 int i;
211 int max_slb_size = 64;
212 int found_inval = -1;
213 int r;
214
Alexander Grafc7f38f42010-04-16 00:11:40 +0200215 if (!to_svcpu(vcpu)->slb_max)
216 to_svcpu(vcpu)->slb_max = 1;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000217
218 /* Are we overwriting? */
Alexander Grafc7f38f42010-04-16 00:11:40 +0200219 for (i = 1; i < to_svcpu(vcpu)->slb_max; i++) {
220 if (!(to_svcpu(vcpu)->slb[i].esid & SLB_ESID_V))
Alexander Graf0d8dc682009-10-30 05:47:11 +0000221 found_inval = i;
Alexander Grafc7f38f42010-04-16 00:11:40 +0200222 else if ((to_svcpu(vcpu)->slb[i].esid & ESID_MASK) == esid)
Alexander Graf0d8dc682009-10-30 05:47:11 +0000223 return i;
224 }
225
226 /* Found a spare entry that was invalidated before */
227 if (found_inval > 0)
228 return found_inval;
229
230 /* No spare invalid entry, so create one */
231
232 if (mmu_slb_size < 64)
233 max_slb_size = mmu_slb_size;
234
235 /* Overflowing -> purge */
Alexander Grafc7f38f42010-04-16 00:11:40 +0200236 if ((to_svcpu(vcpu)->slb_max) == max_slb_size)
Alexander Graf0d8dc682009-10-30 05:47:11 +0000237 kvmppc_mmu_flush_segments(vcpu);
238
Alexander Grafc7f38f42010-04-16 00:11:40 +0200239 r = to_svcpu(vcpu)->slb_max;
240 to_svcpu(vcpu)->slb_max++;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000241
242 return r;
243}
244
245int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
246{
247 u64 esid = eaddr >> SID_SHIFT;
248 u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V;
249 u64 slb_vsid = SLB_VSID_USER;
250 u64 gvsid;
251 int slb_index;
252 struct kvmppc_sid_map *map;
253
254 slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
255
256 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
257 /* Invalidate an entry */
Alexander Grafc7f38f42010-04-16 00:11:40 +0200258 to_svcpu(vcpu)->slb[slb_index].esid = 0;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000259 return -ENOENT;
260 }
261
262 map = find_sid_vsid(vcpu, gvsid);
263 if (!map)
264 map = create_sid_map(vcpu, gvsid);
265
266 map->guest_esid = esid;
267
268 slb_vsid |= (map->host_vsid << 12);
269 slb_vsid &= ~SLB_VSID_KP;
270 slb_esid |= slb_index;
271
Alexander Grafc7f38f42010-04-16 00:11:40 +0200272 to_svcpu(vcpu)->slb[slb_index].esid = slb_esid;
273 to_svcpu(vcpu)->slb[slb_index].vsid = slb_vsid;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000274
Alexander Graf928d78b2010-08-02 21:25:33 +0200275 trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
Alexander Graf0d8dc682009-10-30 05:47:11 +0000276
277 return 0;
278}
279
280void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
281{
Alexander Grafc7f38f42010-04-16 00:11:40 +0200282 to_svcpu(vcpu)->slb_max = 1;
283 to_svcpu(vcpu)->slb[0].esid = 0;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000284}
285
286void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
287{
Alexander Graffef093be2010-06-30 15:18:46 +0200288 kvmppc_mmu_hpte_destroy(vcpu);
Alexander Graf8b6db3b2010-08-15 08:04:24 +0200289 __destroy_context(to_book3s(vcpu)->context_id[0]);
Alexander Graf9cc5e952010-04-16 00:11:45 +0200290}
291
292int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
293{
294 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
295 int err;
296
297 err = __init_new_context();
298 if (err < 0)
299 return -1;
Alexander Graf8b6db3b2010-08-15 08:04:24 +0200300 vcpu3s->context_id[0] = err;
Alexander Graf9cc5e952010-04-16 00:11:45 +0200301
Alexander Graf8b6db3b2010-08-15 08:04:24 +0200302 vcpu3s->vsid_max = ((vcpu3s->context_id[0] + 1) << USER_ESID_BITS) - 1;
303 vcpu3s->vsid_first = vcpu3s->context_id[0] << USER_ESID_BITS;
Alexander Graf9cc5e952010-04-16 00:11:45 +0200304 vcpu3s->vsid_next = vcpu3s->vsid_first;
305
Alexander Graffef093be2010-06-30 15:18:46 +0200306 kvmppc_mmu_hpte_init(vcpu);
307
Alexander Graf9cc5e952010-04-16 00:11:45 +0200308 return 0;
Alexander Graf0d8dc682009-10-30 05:47:11 +0000309}