1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2009 SUSE Linux Products GmbH. All rights reserved.
6 * Alexander Graf <agraf@suse.de>
7 * Kevin Wolf <mail@kevin-wolf.de>
10 #include <linux/kvm_host.h>
12 #include <asm/kvm_ppc.h>
13 #include <asm/kvm_book3s.h>
14 #include <asm/book3s/64/mmu-hash.h>
15 #include <asm/machdep.h>
16 #include <asm/mmu_context.h>
17 #include <asm/hw_irq.h>
23 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
25 mmu_hash_ops.hpte_invalidate(pte->slot, pte->host_vpn,
26 pte->pagesize, pte->pagesize,
27 MMU_SEGSIZE_256M, false);
30 /* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
31 * a hash, so we don't waste cycles on looping */
32 static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
34 return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
35 ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
36 ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
37 ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
38 ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
39 ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
40 ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
41 ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
45 static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
47 struct kvmppc_sid_map *map;
50 if (kvmppc_get_msr(vcpu) & MSR_PR)
53 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
54 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
55 if (map->valid && (map->guest_vsid == gvsid)) {
56 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
60 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
61 if (map->valid && (map->guest_vsid == gvsid)) {
62 trace_kvm_book3s_slb_found(gvsid, map->host_vsid);
66 trace_kvm_book3s_slb_fail(sid_map_mask, gvsid);
70 int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
81 struct kvmppc_sid_map *map;
83 int hpsize = MMU_PAGE_4K;
85 unsigned long mmu_seq;
86 struct kvm *kvm = vcpu->kvm;
87 struct hpte_cache *cpte;
88 unsigned long gfn = orig_pte->raddr >> PAGE_SHIFT;
91 /* used to check for invalidations in progress */
92 mmu_seq = kvm->mmu_notifier_seq;
95 /* Get host physical address for gpa */
96 pfn = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable);
97 if (is_error_noslot_pfn(pfn)) {
98 printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
103 hpaddr = pfn << PAGE_SHIFT;
105 /* and write the mapping ea -> hpa into the pt */
106 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
107 map = find_sid_vsid(vcpu, vsid);
109 ret = kvmppc_mmu_map_segment(vcpu, orig_pte->eaddr);
111 map = find_sid_vsid(vcpu, vsid);
114 printk(KERN_ERR "KVM: Segment map for 0x%llx (0x%lx) failed\n",
115 vsid, orig_pte->eaddr);
121 vpn = hpt_vpn(orig_pte->eaddr, map->host_vsid, MMU_SEGSIZE_256M);
123 kvm_set_pfn_accessed(pfn);
124 if (!orig_pte->may_write || !writable)
127 mark_page_dirty(vcpu->kvm, gfn);
128 kvm_set_pfn_dirty(pfn);
131 if (!orig_pte->may_execute)
134 kvmppc_mmu_flush_icache(pfn);
136 rflags = (rflags & ~HPTE_R_WIMG) | orig_pte->wimg;
139 * Use 64K pages if possible; otherwise, on 64K page kernels,
140 * we need to transfer 4 more bits from guest real to host real addr.
143 hpsize = MMU_PAGE_64K;
145 hpaddr |= orig_pte->raddr & (~0xfffULL & ~PAGE_MASK);
147 hash = hpt_hash(vpn, mmu_psize_defs[hpsize].shift, MMU_SEGSIZE_256M);
149 cpte = kvmppc_mmu_hpte_cache_next(vcpu);
151 spin_lock(&kvm->mmu_lock);
152 if (!cpte || mmu_notifier_retry(kvm, mmu_seq)) {
158 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
160 /* In case we tried normal mapping already, let's nuke old entries */
162 if (mmu_hash_ops.hpte_remove(hpteg) < 0) {
167 ret = mmu_hash_ops.hpte_insert(hpteg, vpn, hpaddr, rflags, vflags,
168 hpsize, hpsize, MMU_SEGSIZE_256M);
171 /* If we couldn't map a primary PTE, try a secondary */
173 vflags ^= HPTE_V_SECONDARY;
176 } else if (ret < 0) {
180 trace_kvm_book3s_64_mmu_map(rflags, hpteg,
181 vpn, hpaddr, orig_pte);
184 * The mmu_hash_ops code may give us a secondary entry even
185 * though we asked for a primary. Fix up.
187 if ((ret & _PTEIDX_SECONDARY) && !(vflags & HPTE_V_SECONDARY)) {
189 hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
192 cpte->slot = hpteg + (ret & 7);
193 cpte->host_vpn = vpn;
194 cpte->pte = *orig_pte;
196 cpte->pagesize = hpsize;
198 kvmppc_mmu_hpte_cache_map(vcpu, cpte);
203 spin_unlock(&kvm->mmu_lock);
204 kvm_release_pfn_clean(pfn);
206 kvmppc_mmu_hpte_cache_free(cpte);
212 void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
214 u64 mask = 0xfffffffffULL;
217 vcpu->arch.mmu.esid_to_vsid(vcpu, pte->eaddr >> SID_SHIFT, &vsid);
219 mask = 0xffffffff0ULL;
220 kvmppc_mmu_pte_vflush(vcpu, pte->vpage, mask);
223 static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
225 unsigned long vsid_bits = VSID_BITS_65_256M;
226 struct kvmppc_sid_map *map;
227 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
229 static int backwards_map = 0;
231 if (kvmppc_get_msr(vcpu) & MSR_PR)
234 /* We might get collisions that trap in preceding order, so let's
235 map them differently */
237 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
239 sid_map_mask = SID_MAP_MASK - sid_map_mask;
241 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
243 /* Make sure we're taking the other map next time */
244 backwards_map = !backwards_map;
246 /* Uh-oh ... out of mappings. Let's flush! */
247 if (vcpu_book3s->proto_vsid_next == vcpu_book3s->proto_vsid_max) {
248 vcpu_book3s->proto_vsid_next = vcpu_book3s->proto_vsid_first;
249 memset(vcpu_book3s->sid_map, 0,
250 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
251 kvmppc_mmu_pte_flush(vcpu, 0, 0);
252 kvmppc_mmu_flush_segments(vcpu);
255 if (mmu_has_feature(MMU_FTR_68_BIT_VA))
256 vsid_bits = VSID_BITS_256M;
258 map->host_vsid = vsid_scramble(vcpu_book3s->proto_vsid_next++,
259 VSID_MULTIPLIER_256M, vsid_bits);
261 map->guest_vsid = gvsid;
264 trace_kvm_book3s_slb_map(sid_map_mask, gvsid, map->host_vsid);
269 static int kvmppc_mmu_next_segment(struct kvm_vcpu *vcpu, ulong esid)
271 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
273 int max_slb_size = 64;
274 int found_inval = -1;
277 /* Are we overwriting? */
278 for (i = 0; i < svcpu->slb_max; i++) {
279 if (!(svcpu->slb[i].esid & SLB_ESID_V))
281 else if ((svcpu->slb[i].esid & ESID_MASK) == esid) {
287 /* Found a spare entry that was invalidated before */
288 if (found_inval >= 0) {
293 /* No spare invalid entry, so create one */
295 if (mmu_slb_size < 64)
296 max_slb_size = mmu_slb_size;
298 /* Overflowing -> purge */
299 if ((svcpu->slb_max) == max_slb_size)
300 kvmppc_mmu_flush_segments(vcpu);
310 int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
312 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
313 u64 esid = eaddr >> SID_SHIFT;
314 u64 slb_esid = (eaddr & ESID_MASK) | SLB_ESID_V;
315 u64 slb_vsid = SLB_VSID_USER;
318 struct kvmppc_sid_map *map;
321 slb_index = kvmppc_mmu_next_segment(vcpu, eaddr & ESID_MASK);
323 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
324 /* Invalidate an entry */
325 svcpu->slb[slb_index].esid = 0;
330 map = find_sid_vsid(vcpu, gvsid);
332 map = create_sid_map(vcpu, gvsid);
334 map->guest_esid = esid;
336 slb_vsid |= (map->host_vsid << 12);
337 slb_vsid &= ~SLB_VSID_KP;
338 slb_esid |= slb_index;
340 #ifdef CONFIG_PPC_64K_PAGES
341 /* Set host segment base page size to 64K if possible */
342 if (gvsid & VSID_64K)
343 slb_vsid |= mmu_psize_defs[MMU_PAGE_64K].sllp;
346 svcpu->slb[slb_index].esid = slb_esid;
347 svcpu->slb[slb_index].vsid = slb_vsid;
349 trace_kvm_book3s_slbmte(slb_vsid, slb_esid);
356 void kvmppc_mmu_flush_segment(struct kvm_vcpu *vcpu, ulong ea, ulong seg_size)
358 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
359 ulong seg_mask = -seg_size;
362 for (i = 0; i < svcpu->slb_max; i++) {
363 if ((svcpu->slb[i].esid & SLB_ESID_V) &&
364 (svcpu->slb[i].esid & seg_mask) == ea) {
365 /* Invalidate this entry */
366 svcpu->slb[i].esid = 0;
373 void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
375 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
377 svcpu->slb[0].esid = 0;
381 void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
383 kvmppc_mmu_hpte_destroy(vcpu);
384 __destroy_context(to_book3s(vcpu)->context_id[0]);
387 int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
389 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
392 err = hash__alloc_context_id();
395 vcpu3s->context_id[0] = err;
397 vcpu3s->proto_vsid_max = ((u64)(vcpu3s->context_id[0] + 1)
399 vcpu3s->proto_vsid_first = (u64)vcpu3s->context_id[0] << ESID_BITS;
400 vcpu3s->proto_vsid_next = vcpu3s->proto_vsid_first;
402 kvmppc_mmu_hpte_init(vcpu);