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/mmu-hash64.h>
27 #include <asm/machdep.h>
28 #include <asm/mmu_context.h>
29 #include <asm/hw_irq.h>
34 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
36 ppc_md.hpte_invalidate(pte->slot, pte->host_vpn,
37 pte->pagesize, pte->pagesize, MMU_SEGSIZE_256M,
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 */
43 static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
45 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));
56 static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
58 struct kvmppc_sid_map *map;
61 if (vcpu->arch.shared->msr & MSR_PR)
64 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
65 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
66 if (map->valid && (map->guest_vsid == gvsid)) {
67 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
71 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
72 if (map->valid && (map->guest_vsid == gvsid)) {
73 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
77 trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
81 int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
92 struct kvmppc_sid_map *map;
94 int hpsize = MMU_PAGE_4K;
96 unsigned long mmu_seq;
97 struct kvm *kvm = vcpu->kvm;
98 struct hpte_cache *cpte;
100 /* used to check for invalidations in progress */
101 mmu_seq = kvm->mmu_notifier_seq;
104 /* Get host physical address for gpa */
105 hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT,
107 if (is_error_noslot_pfn(hpaddr)) {
108 printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n", orig_pte->eaddr);
112 hpaddr <<= PAGE_SHIFT;
114 /* and write the mapping ea -> hpa into the pt */
115 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
116 map = find_sid_vsid(vcpu, vsid);
118 ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
120 map = find_sid_vsid(vcpu, vsid);
123 printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
124 vsid, orig_pte->eaddr);
130 vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);
132 if (!orig_pte->may_write || !writable)
135 mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
137 if (!orig_pte->may_execute)
140 kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
143 * Use 64K pages if possible; otherwise, on 64K page kernels,
144 * we need to transfer 4 more bits from guest real to host real addr.
147 hpsize = MMU_PAGE_64K;
149 hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
151 hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);
153 cpte = kvmppc_mmu_hpte_cache_next(vcpu);
155 spin_lock(&kvm->mmu_lock);
156 if (!cpte || mmu_notifier_retry(kvm, mmu_seq)) {
162 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
164 /* In case we tried normal mapping already, let's nuke old entries */
166 if (ppc_md.hpte_remove(hpteg) < 0) {
171 ret = ppc_md.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
172 hpsize, hpsize, MMU_SEGSIZE_256M);
175 /* If we couldn't map a primary PTE, try a secondary */
177 vflags ^= HPTE_V_SECONDARY;
181 trace_kvm_book3s_64_mmu_map(rflags, hpteg,
182 vpn, hpaddr, orig_pte);
184 /* The ppc_md code may give us a secondary entry even though we
185 asked for a primary. Fix up. */
186 if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
188 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
191 cpte->slot = hpteg + (ret & 7);
192 cpte->host_vpn = vpn;
193 cpte->pte = *orig_pte;
194 cpte->pfn = hpaddr >> PAGE_SHIFT;
195 cpte->pagesize = hpsize;
197 kvmppc_mmu_hpte_cache_map(vcpu, cpte);
202 spin_unlock(&kvm->mmu_lock);
203 kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
205 kvmppc_mmu_hpte_cache_free(cpte);
211 void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
213 u64 mask = 0xfffffffffULL;
216 vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
218 mask = 0xffffffff0ULL;
219 kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
222 static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
224 struct kvmppc_sid_map *map;
225 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
227 static int backwards_map = 0;
229 if (vcpu->arch.shared->msr & MSR_PR)
232 /* We might get collisions that trap in preceding order, so let's
233 map them differently */
235 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
237 sid_map_mask = SID_MAP_MASK - sid_map_mask;
239 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
241 /* Make sure we're taking the other map next time */
242 backwards_map = !backwards_map;
244 /* Uh-oh ... out of mappings. Let's flush! */
245 if (vcpu_book3s->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
246 vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_vsid_first;
247 memset(vcpu_book3s->sid_map, 0,
248 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
249 kvmppc_mmu_pte_flush(vcpu, 0, 0);
250 kvmppc_mmu_flush_segments(vcpu);
252 map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++, 256M);
254 map->guest_vsid = gvsid;
257 trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);
262 static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
264 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
266 int max_slb_size = 64;
267 int found_inval = -1;
273 /* Are we overwriting? */
274 for (i = 1; i < svcpu->slb_max; i++) {
275 if (!(svcpu->slb[i].esid & SLB_ESID_V))
277 else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
283 /* Found a spare entry that was invalidated before */
284 if (found_inval > 0) {
289 /* No spare invalid entry, so create one */
291 if (mmu_slb_size < 64)
292 max_slb_size = mmu_slb_size;
294 /* Overflowing -> purge */
295 if ((svcpu->slb_max) == max_slb_size)
296 kvmppc_mmu_flush_segments(vcpu);
306 int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
308 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
309 u64 esid = eaddr >> SID_SHIFT;
310 u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V;
311 u64 slb_vsid = SLB_VSID_USER;
314 struct kvmppc_sid_map *map;
317 slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
319 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
320 /* Invalidate an entry */
321 svcpu->slb[slb_index].esid = 0;
326 map = find_sid_vsid(vcpu, gvsid);
328 map = create_sid_map(vcpu, gvsid);
330 map->guest_esid = esid;
332 slb_vsid |= (map->host_vsid << 12);
333 slb_vsid &= ~SLB_VSID_KP;
334 slb_esid |= slb_index;
336 #ifdef CONFIG_PPC_64K_PAGES
337 /* Set host segment base page size to 64K if possible */
338 if (gvsid & VSID_64K)
339 slb_vsid |= mmu_psize_defs[MMU_PAGE_64K].sllp;
342 svcpu->slb[slb_index].esid = slb_esid;
343 svcpu->slb[slb_index].vsid = slb_vsid;
345 trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
352 void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
354 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
355 ulong seg_mask = -seg_size;
358 for (i = 1; i < svcpu->slb_max; i++) {
359 if ((svcpu->slb[i].esid & SLB_ESID_V) &&
360 (svcpu->slb[i].esid & seg_mask) == ea) {
361 /* Invalidate this entry */
362 svcpu->slb[i].esid = 0;
369 void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
371 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
373 svcpu->slb[0].esid = 0;
377 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
379 kvmppc_mmu_hpte_destroy(vcpu);
380 __destroy_context(to_book3s(vcpu)->context_id[0]);
383 int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
385 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
388 err = __init_new_context();
391 vcpu3s->context_id[0] = err;
393 vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
395 vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
396 vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
398 kvmppc_mmu_hpte_init(vcpu);