2 * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
5 * Alexander Graf <agraf@suse.de>
6 * Kevin Wolf <mail@kevin-wolf.de>
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.
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.
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.
22 #include <linux/kvm_host.h>
24 #include <asm/kvm_ppc.h>
25 #include <asm/kvm_book3s.h>
26 #include <asm/book3s/64/mmu-hash.h>
27 #include <asm/machdep.h>
28 #include <asm/mmu_context.h>
29 #include <asm/hw_irq.h>
35 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
37 mmu_hash_ops.hpte_invalidate(pte->slot, pte->host_vpn,
38 pte->pagesize, pte->pagesize,
39 MMU_SEGSIZE_256M, false);
42 /* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
43 * a hash, so we don't waste cycles on looping */
44 static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
46 return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
47 ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
48 ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
49 ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
50 ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
51 ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
52 ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
53 ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
57 static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
59 struct kvmppc_sid_map *map;
62 if (kvmppc_get_msr(vcpu) & MSR_PR)
65 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
66 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
67 if (map->valid && (map->guest_vsid == gvsid)) {
68 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
72 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
73 if (map->valid && (map->guest_vsid == gvsid)) {
74 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
78 trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
82 int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
93 struct kvmppc_sid_map *map;
95 int hpsize = MMU_PAGE_4K;
97 unsigned long mmu_seq;
98 struct kvm *kvm = vcpu->kvm;
99 struct hpte_cache *cpte;
100 unsigned long gfn = orig_pte->raddr >> PAGE_SHIFT;
103 /* used to check for invalidations in progress */
104 mmu_seq = kvm->mmu_notifier_seq;
107 /* Get host physical address for gpa */
108 pfn = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
109 if (is_error_noslot_pfn(pfn)) {
110 printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
115 hpaddr = pfn << PAGE_SHIFT;
117 /* and write the mapping ea -> hpa into the pt */
118 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
119 map = find_sid_vsid(vcpu, vsid);
121 ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
123 map = find_sid_vsid(vcpu, vsid);
126 printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
127 vsid, orig_pte->eaddr);
133 vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);
135 kvm_set_pfn_accessed(pfn);
136 if (!orig_pte->may_write || !writable)
139 mark_page_dirty(vcpu->kvm, gfn);
140 kvm_set_pfn_dirty(pfn);
143 if (!orig_pte->may_execute)
146 kvmppc_mmu_flush_icache(pfn);
149 * Use 64K pages if possible; otherwise, on 64K page kernels,
150 * we need to transfer 4 more bits from guest real to host real addr.
153 hpsize = MMU_PAGE_64K;
155 hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
157 hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);
159 cpte = kvmppc_mmu_hpte_cache_next(vcpu);
161 spin_lock(&kvm->mmu_lock);
162 if (!cpte || mmu_notifier_retry(kvm, mmu_seq)) {
168 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
170 /* In case we tried normal mapping already, let's nuke old entries */
172 if (mmu_hash_ops.hpte_remove(hpteg) < 0) {
177 ret = mmu_hash_ops.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
178 hpsize, hpsize, MMU_SEGSIZE_256M);
181 /* If we couldn't map a primary PTE, try a secondary */
183 vflags ^= HPTE_V_SECONDARY;
187 trace_kvm_book3s_64_mmu_map(rflags, hpteg,
188 vpn, hpaddr, orig_pte);
191 * The mmu_hash_ops code may give us a secondary entry even
192 * though we asked for a primary. Fix up.
194 if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
196 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
199 cpte->slot = hpteg + (ret & 7);
200 cpte->host_vpn = vpn;
201 cpte->pte = *orig_pte;
203 cpte->pagesize = hpsize;
205 kvmppc_mmu_hpte_cache_map(vcpu, cpte);
210 spin_unlock(&kvm->mmu_lock);
211 kvm_release_pfn_clean(pfn);
213 kvmppc_mmu_hpte_cache_free(cpte);
219 void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
221 u64 mask = 0xfffffffffULL;
224 vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
226 mask = 0xffffffff0ULL;
227 kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
230 static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
232 unsigned long vsid_bits = VSID_BITS_65_256M;
233 struct kvmppc_sid_map *map;
234 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
236 static int backwards_map = 0;
238 if (kvmppc_get_msr(vcpu) & MSR_PR)
241 /* We might get collisions that trap in preceding order, so let's
242 map them differently */
244 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
246 sid_map_mask = SID_MAP_MASK - sid_map_mask;
248 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
250 /* Make sure we're taking the other map next time */
251 backwards_map = !backwards_map;
253 /* Uh-oh ... out of mappings. Let's flush! */
254 if (vcpu_book3s->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
255 vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_vsid_first;
256 memset(vcpu_book3s->sid_map, 0,
257 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
258 kvmppc_mmu_pte_flush(vcpu, 0, 0);
259 kvmppc_mmu_flush_segments(vcpu);
262 if (mmu_has_feature(MMU_FTR_68_BIT_VA))
263 vsid_bits = VSID_BITS_256M;
265 map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++,
266 VSID_MULTIPLIER_256M, vsid_bits);
268 map->guest_vsid = gvsid;
271 trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);
276 static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
278 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
280 int max_slb_size = 64;
281 int found_inval = -1;
284 /* Are we overwriting? */
285 for (i = 0; i < svcpu->slb_max; i++) {
286 if (!(svcpu->slb[i].esid & SLB_ESID_V))
288 else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
294 /* Found a spare entry that was invalidated before */
295 if (found_inval >= 0) {
300 /* No spare invalid entry, so create one */
302 if (mmu_slb_size < 64)
303 max_slb_size = mmu_slb_size;
305 /* Overflowing -> purge */
306 if ((svcpu->slb_max) == max_slb_size)
307 kvmppc_mmu_flush_segments(vcpu);
317 int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
319 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
320 u64 esid = eaddr >> SID_SHIFT;
321 u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V;
322 u64 slb_vsid = SLB_VSID_USER;
325 struct kvmppc_sid_map *map;
328 slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
330 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
331 /* Invalidate an entry */
332 svcpu->slb[slb_index].esid = 0;
337 map = find_sid_vsid(vcpu, gvsid);
339 map = create_sid_map(vcpu, gvsid);
341 map->guest_esid = esid;
343 slb_vsid |= (map->host_vsid << 12);
344 slb_vsid &= ~SLB_VSID_KP;
345 slb_esid |= slb_index;
347 #ifdef CONFIG_PPC_64K_PAGES
348 /* Set host segment base page size to 64K if possible */
349 if (gvsid & VSID_64K)
350 slb_vsid |= mmu_psize_defs[MMU_PAGE_64K].sllp;
353 svcpu->slb[slb_index].esid = slb_esid;
354 svcpu->slb[slb_index].vsid = slb_vsid;
356 trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
363 void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
365 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
366 ulong seg_mask = -seg_size;
369 for (i = 0; i < svcpu->slb_max; i++) {
370 if ((svcpu->slb[i].esid & SLB_ESID_V) &&
371 (svcpu->slb[i].esid & seg_mask) == ea) {
372 /* Invalidate this entry */
373 svcpu->slb[i].esid = 0;
380 void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
382 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
384 svcpu->slb[0].esid = 0;
388 void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
390 kvmppc_mmu_hpte_destroy(vcpu);
391 __destroy_context(to_book3s(vcpu)->context_id[0]);
394 int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
396 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
399 err = hash__alloc_context_id();
402 vcpu3s->context_id[0] = err;
404 vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
406 vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
407 vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
409 kvmppc_mmu_hpte_init(vcpu);