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Linux/arch/powerpc/kvm/book3s_32_mmu_host.c

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  1 /*
  2  * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
  3  *
  4  * Authors:
  5  *     Alexander Graf <agraf@suse.de>
  6  *
  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.
 10  *
 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.
 15  *
 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.
 19  */
 20 
 21 #include <linux/kvm_host.h>
 22 
 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>
 29 
 30 /* #define DEBUG_MMU */
 31 /* #define DEBUG_SR */
 32 
 33 #ifdef DEBUG_MMU
 34 #define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
 35 #else
 36 #define dprintk_mmu(a, ...) do { } while(0)
 37 #endif
 38 
 39 #ifdef DEBUG_SR
 40 #define dprintk_sr(a, ...) printk(KERN_INFO a, __VA_ARGS__)
 41 #else
 42 #define dprintk_sr(a, ...) do { } while(0)
 43 #endif
 44 
 45 #if PAGE_SHIFT != 12
 46 #error Unknown page size
 47 #endif
 48 
 49 #ifdef CONFIG_SMP
 50 #error XXX need to grab mmu_hash_lock
 51 #endif
 52 
 53 #ifdef CONFIG_PTE_64BIT
 54 #error Only 32 bit pages are supported for now
 55 #endif
 56 
 57 static ulong htab;
 58 static u32 htabmask;
 59 
 60 void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
 61 {
 62         volatile u32 *pteg;
 63 
 64         /* Remove from host HTAB */
 65         pteg = (u32*)pte->slot;
 66         pteg[0] = 0;
 67 
 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");
 73 }
 74 
 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)
 78 {
 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));
 87 }
 88 
 89 
 90 static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
 91 {
 92         struct kvmppc_sid_map *map;
 93         u16 sid_map_mask;
 94 
 95         if (vcpu->arch.shared->msr & MSR_PR)
 96                 gvsid |= VSID_PR;
 97 
 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);
103                 return map;
104         }
105 
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);
110                 return map;
111         }
112 
113         dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid);
114         return NULL;
115 }
116 
117 static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr,
118                                 bool primary)
119 {
120         u32 page, hash;
121         ulong pteg = htab;
122 
123         page = (eaddr & ~ESID_MASK) >> 12;
124 
125         hash = ((vsid ^ page) << 6);
126         if (!primary)
127                 hash = ~hash;
128 
129         hash &= htabmask;
130 
131         pteg |= hash;
132 
133         dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n",
134                 htab, hash, htabmask, pteg);
135 
136         return (u32*)pteg;
137 }
138 
139 extern char etext[];
140 
141 int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
142                         bool iswrite)
143 {
144         pfn_t hpaddr;
145         u64 vpn;
146         u64 vsid;
147         struct kvmppc_sid_map *map;
148         volatile u32 *pteg;
149         u32 eaddr = orig_pte->eaddr;
150         u32 pteg0, pteg1;
151         register int rr = 0;
152         bool primary = false;
153         bool evict = false;
154         struct hpte_cache *pte;
155         int r = 0;
156         bool writable;
157 
158         /* Get host physical address for gpa */
159         hpaddr = kvmppc_gfn_to_pfn(vcpu, orig_pte->raddr >> PAGE_SHIFT,
160                                    iswrite, &writable);
161         if (is_error_noslot_pfn(hpaddr)) {
162                 printk(KERN_INFO "Couldn't get guest page for gfn %lx!\n",
163                                  orig_pte->eaddr);
164                 r = -EINVAL;
165                 goto out;
166         }
167         hpaddr <<= PAGE_SHIFT;
168 
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);
172         if (!map) {
173                 kvmppc_mmu_map_segment(vcpu, eaddr);
174                 map = find_sid_vsid(vcpu, vsid);
175         }
176         BUG_ON(!map);
177 
178         vsid = map->host_vsid;
179         vpn = (vsid << (SID_SHIFT - VPN_SHIFT)) |
180                 ((eaddr & ~ESID_MASK) >> VPN_SHIFT);
181 next_pteg:
182         if (rr == 16) {
183                 primary = !primary;
184                 evict = true;
185                 rr = 0;
186         }
187 
188         pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary);
189 
190         /* not evicting yet */
191         if (!evict && (pteg[rr] & PTE_V)) {
192                 rr += 2;
193                 goto next_pteg;
194         }
195 
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]);
205 
206         pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V |
207                 (primary ? 0 : PTE_SEC);
208         pteg1 = hpaddr | PTE_M | PTE_R | PTE_C;
209 
210         if (orig_pte->may_write && writable) {
211                 pteg1 |= PP_RWRW;
212                 mark_page_dirty(vcpu->kvm, orig_pte->raddr >> PAGE_SHIFT);
213         } else {
214                 pteg1 |= PP_RWRX;
215         }
216 
217         if (orig_pte->may_execute)
218                 kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
219 
220         local_irq_disable();
221 
222         if (pteg[rr]) {
223                 pteg[rr] = 0;
224                 asm volatile ("sync");
225         }
226         pteg[rr + 1] = pteg1;
227         pteg[rr] = pteg0;
228         asm volatile ("sync");
229 
230         local_irq_enable();
231 
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]);
241 
242 
243         /* Now tell our Shadow PTE code about the new page */
244 
245         pte = kvmppc_mmu_hpte_cache_next(vcpu);
246         if (!pte) {
247                 kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
248                 r = -EAGAIN;
249                 goto out;
250         }
251 
252         dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
253                     orig_pte->may_write ? 'w' : '-',
254                     orig_pte->may_execute ? 'x' : '-',
255                     orig_pte->eaddr, (ulong)pteg, vpn,
256                     orig_pte->vpage, hpaddr);
257 
258         pte->slot = (ulong)&pteg[rr];
259         pte->host_vpn = vpn;
260         pte->pte = *orig_pte;
261         pte->pfn = hpaddr >> PAGE_SHIFT;
262 
263         kvmppc_mmu_hpte_cache_map(vcpu, pte);
264 
265         kvm_release_pfn_clean(hpaddr >> PAGE_SHIFT);
266 out:
267         return r;
268 }
269 
270 void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
271 {
272         kvmppc_mmu_pte_vflush(vcpu, pte->vpage, 0xfffffffffULL);
273 }
274 
275 static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
276 {
277         struct kvmppc_sid_map *map;
278         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
279         u16 sid_map_mask;
280         static int backwards_map = 0;
281 
282         if (vcpu->arch.shared->msr & MSR_PR)
283                 gvsid |= VSID_PR;
284 
285         /* We might get collisions that trap in preceding order, so let's
286            map them differently */
287 
288         sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
289         if (backwards_map)
290                 sid_map_mask = SID_MAP_MASK - sid_map_mask;
291 
292         map = &to_book3s(vcpu)->sid_map[sid_map_mask];
293 
294         /* Make sure we're taking the other map next time */
295         backwards_map = !backwards_map;
296 
297         /* Uh-oh ... out of mappings. Let's flush! */
298         if (vcpu_book3s->vsid_next >= VSID_POOL_SIZE) {
299                 vcpu_book3s->vsid_next = 0;
300                 memset(vcpu_book3s->sid_map, 0,
301                        sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
302                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
303                 kvmppc_mmu_flush_segments(vcpu);
304         }
305         map->host_vsid = vcpu_book3s->vsid_pool[vcpu_book3s->vsid_next];
306         vcpu_book3s->vsid_next++;
307 
308         map->guest_vsid = gvsid;
309         map->valid = true;
310 
311         return map;
312 }
313 
314 int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
315 {
316         u32 esid = eaddr >> SID_SHIFT;
317         u64 gvsid;
318         u32 sr;
319         struct kvmppc_sid_map *map;
320         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
321         int r = 0;
322 
323         if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
324                 /* Invalidate an entry */
325                 svcpu->sr[esid] = SR_INVALID;
326                 r = -ENOENT;
327                 goto out;
328         }
329 
330         map = find_sid_vsid(vcpu, gvsid);
331         if (!map)
332                 map = create_sid_map(vcpu, gvsid);
333 
334         map->guest_esid = esid;
335         sr = map->host_vsid | SR_KP;
336         svcpu->sr[esid] = sr;
337 
338         dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr);
339 
340 out:
341         svcpu_put(svcpu);
342         return r;
343 }
344 
345 void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
346 {
347         int i;
348         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
349 
350         dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr));
351         for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++)
352                 svcpu->sr[i] = SR_INVALID;
353 
354         svcpu_put(svcpu);
355 }
356 
357 void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
358 {
359         int i;
360 
361         kvmppc_mmu_hpte_destroy(vcpu);
362         preempt_disable();
363         for (i = 0; i < SID_CONTEXTS; i++)
364                 __destroy_context(to_book3s(vcpu)->context_id[i]);
365         preempt_enable();
366 }
367 
368 /* From mm/mmu_context_hash32.c */
369 #define CTX_TO_VSID(c, id)      ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)
370 
371 int kvmppc_mmu_init(struct kvm_vcpu *vcpu)
372 {
373         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
374         int err;
375         ulong sdr1;
376         int i;
377         int j;
378 
379         for (i = 0; i < SID_CONTEXTS; i++) {
380                 err = __init_new_context();
381                 if (err < 0)
382                         goto init_fail;
383                 vcpu3s->context_id[i] = err;
384 
385                 /* Remember context id for this combination */
386                 for (j = 0; j < 16; j++)
387                         vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j);
388         }
389 
390         vcpu3s->vsid_next = 0;
391 
392         /* Remember where the HTAB is */
393         asm ( "mfsdr1 %0" : "=r"(sdr1) );
394         htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0;
395         htab = (ulong)__va(sdr1 & 0xffff0000);
396 
397         kvmppc_mmu_hpte_init(vcpu);
398 
399         return 0;
400 
401 init_fail:
402         for (j = 0; j < i; j++) {
403                 if (!vcpu3s->context_id[j])
404                         continue;
405 
406                 __destroy_context(to_book3s(vcpu)->context_id[j]);
407         }
408 
409         return -1;
410 }
411 

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