2 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
5 * Alexander Graf <agraf@suse.de>
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.
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.
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.
21 #include <linux/kvm_host.h>
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>
30 /* #define DEBUG_MMU */
31 /* #define DEBUG_SR */
34 #define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
36 #define dprintk_mmu(a, ...) do { } while(0)
40 #define dprintk_sr(a, ...) printk(KERN_INFO a, __VA_ARGS__)
42 #define dprintk_sr(a, ...) do { } while(0)
46 #error Unknown page size
50 #error XXX need to grab mmu_hash_lock
53 #ifdef CONFIG_PTE_64BIT
54 #error Only 32 bit pages are supported for now
60 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
64 /* Remove from host HTAB */
65 pteg = (u32*)pte->slot;
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");
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 */
77 static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
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));
90 static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
92 struct kvmppc_sid_map *map;
95 if (vcpu->arch.shared->msr & MSR_PR)
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);
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);
113 dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid);
117 static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr,
123 page = (eaddr & ~ESID_MASK) >> 12;
125 hash = ((vsid ^ page) << 6);
133 dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n",
134 htab, hash, htabmask, pteg);
141 int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
147 struct kvmppc_sid_map *map;
149 u32 eaddr = orig_pte->eaddr;
152 bool primary = false;
154 struct hpte_cache *pte;
158 /* Get host physical address for gpa */
159 hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT,
161 if (is_error_noslot_pfn(hpaddr)) {
162 printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n",
167 hpaddr <<= PAGE_SHIFT;
169 /* and write the mapping ea -> hpa into the pt */
170 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
171 map = find_sid_vsid(vcpu, vsid);
173 kvmppc_mmu_map_segment(vcpu, eaddr);
174 map = find_sid_vsid(vcpu, vsid);
178 vsid = map->host_vsid;
179 vpn = (vsid << (SID_SHIFT - VPN_SHIFT)) |
180 ((eaddr & ~ESID_MASK) >> VPN_SHIFT);
188 pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary);
190 /* not evicting yet */
191 if (!evict && (pteg[rr] & PTE_V)) {
196 dprintk_mmu("KVM: old PTEG: %p (%d)\n", pteg, rr);
197 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
198 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
199 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
200 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
201 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
202 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
203 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
204 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
206 pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V |
207 (primary ? 0 : PTE_SEC);
208 pteg1 = hpaddr | PTE_M | PTE_R | PTE_C;
210 if (orig_pte->may_write && writable) {
212 mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
217 if (orig_pte->may_execute)
218 kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
224 asm volatile ("sync");
226 pteg[rr + 1] = pteg1;
228 asm volatile ("sync");
232 dprintk_mmu("KVM: new PTEG: %p\n", pteg);
233 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
234 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
235 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
236 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
237 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
238 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
239 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
240 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
243 /* Now tell our Shadow PTE code about the new page */
245 pte = kvmppc_mmu_hpte_cache_next(vcpu);
247 dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
248 orig_pte->may_write ? 'w' : '-',
249 orig_pte->may_execute ? 'x' : '-',
250 orig_pte->eaddr, (ulong)pteg, vpn,
251 orig_pte->vpage, hpaddr);
253 pte->slot = (ulong)&pteg[rr];
255 pte->pte = *orig_pte;
256 pte->pfn = hpaddr >> PAGE_SHIFT;
258 kvmppc_mmu_hpte_cache_map(vcpu, pte);
260 kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
265 void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
267 kvmppc_mmu_pte_vflush(vcpu, pte->vpage, 0xfffffffffULL);
270 static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
272 struct kvmppc_sid_map *map;
273 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
275 static int backwards_map = 0;
277 if (vcpu->arch.shared->msr & MSR_PR)
280 /* We might get collisions that trap in preceding order, so let's
281 map them differently */
283 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
285 sid_map_mask = SID_MAP_MASK - sid_map_mask;
287 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
289 /* Make sure we're taking the other map next time */
290 backwards_map = !backwards_map;
292 /* Uh-oh ... out of mappings. Let's flush! */
293 if (vcpu_book3s->vsid_next >= VSID_POOL_SIZE) {
294 vcpu_book3s->vsid_next = 0;
295 memset(vcpu_book3s->sid_map, 0,
296 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
297 kvmppc_mmu_pte_flush(vcpu, 0, 0);
298 kvmppc_mmu_flush_segments(vcpu);
300 map->host_vsid = vcpu_book3s->vsid_pool[vcpu_book3s->vsid_next];
301 vcpu_book3s->vsid_next++;
303 map->guest_vsid = gvsid;
309 int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
311 u32 esid = eaddr >> SID_SHIFT;
314 struct kvmppc_sid_map *map;
315 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
318 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
319 /* Invalidate an entry */
320 svcpu->sr[esid] = SR_INVALID;
325 map = find_sid_vsid(vcpu, gvsid);
327 map = create_sid_map(vcpu, gvsid);
329 map->guest_esid = esid;
330 sr = map->host_vsid | SR_KP;
331 svcpu->sr[esid] = sr;
333 dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr);
340 void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
343 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
345 dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr));
346 for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++)
347 svcpu->sr[i] = SR_INVALID;
352 void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
356 kvmppc_mmu_hpte_destroy(vcpu);
358 for (i = 0; i < SID_CONTEXTS; i++)
359 __destroy_context(to_book3s(vcpu)->context_id[i]);
363 /* From mm/mmu_context_hash32.c */
364 #define CTX_TO_VSID(c, id) ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)
366 int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
368 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
374 for (i = 0; i < SID_CONTEXTS; i++) {
375 err = __init_new_context();
378 vcpu3s->context_id[i] = err;
380 /* Remember context id for this combination */
381 for (j = 0; j < 16; j++)
382 vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j);
385 vcpu3s->vsid_next = 0;
387 /* Remember where the HTAB is */
388 asm ( "mfsdr1 %0" : "=r"(sdr1) );
389 htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0;
390 htab = (ulong)__va(sdr1 & 0xffff0000);
392 kvmppc_mmu_hpte_init(vcpu);
397 for (j = 0; j < i; j++) {
398 if (!vcpu3s->context_id[j])
401 __destroy_context(to_book3s(vcpu)->context_id[j]);