Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / arch / powerpc / kvm / book3s_32_mmu.c
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License, version 2, as
4  * published by the Free Software Foundation.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program; if not, write to the Free Software
13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
14  *
15  * Copyright SUSE Linux Products GmbH 2009
16  *
17  * Authors: Alexander Graf <agraf@suse.de>
18  */
19
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kvm.h>
23 #include <linux/kvm_host.h>
24 #include <linux/highmem.h>
25
26 #include <asm/tlbflush.h>
27 #include <asm/kvm_ppc.h>
28 #include <asm/kvm_book3s.h>
29
30 /* #define DEBUG_MMU */
31 /* #define DEBUG_MMU_PTE */
32 /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */
33
34 #ifdef DEBUG_MMU
35 #define dprintk(X...) printk(KERN_INFO X)
36 #else
37 #define dprintk(X...) do { } while(0)
38 #endif
39
40 #ifdef DEBUG_PTE
41 #define dprintk_pte(X...) printk(KERN_INFO X)
42 #else
43 #define dprintk_pte(X...) do { } while(0)
44 #endif
45
46 #define PTEG_FLAG_ACCESSED      0x00000100
47 #define PTEG_FLAG_DIRTY         0x00000080
48
49 static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
50 {
51 #ifdef DEBUG_MMU_PTE_IP
52         return vcpu->arch.pc == DEBUG_MMU_PTE_IP;
53 #else
54         return true;
55 #endif
56 }
57
58 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
59                                           struct kvmppc_pte *pte, bool data);
60
61 static struct kvmppc_sr *find_sr(struct kvmppc_vcpu_book3s *vcpu_book3s, gva_t eaddr)
62 {
63         return &vcpu_book3s->sr[(eaddr >> 28) & 0xf];
64 }
65
66 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
67                                          bool data)
68 {
69         struct kvmppc_sr *sre = find_sr(to_book3s(vcpu), eaddr);
70         struct kvmppc_pte pte;
71
72         if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data))
73                 return pte.vpage;
74
75         return (((u64)eaddr >> 12) & 0xffff) | (((u64)sre->vsid) << 16);
76 }
77
78 static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
79 {
80         kvmppc_set_msr(vcpu, 0);
81 }
82
83 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s,
84                                       struct kvmppc_sr *sre, gva_t eaddr,
85                                       bool primary)
86 {
87         u32 page, hash, pteg, htabmask;
88         hva_t r;
89
90         page = (eaddr & 0x0FFFFFFF) >> 12;
91         htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;
92
93         hash = ((sre->vsid ^ page) << 6);
94         if (!primary)
95                 hash = ~hash;
96         hash &= htabmask;
97
98         pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;
99
100         dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
101                 vcpu_book3s->vcpu.arch.pc, eaddr, vcpu_book3s->sdr1, pteg,
102                 sre->vsid);
103
104         r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
105         if (kvm_is_error_hva(r))
106                 return r;
107         return r | (pteg & ~PAGE_MASK);
108 }
109
110 static u32 kvmppc_mmu_book3s_32_get_ptem(struct kvmppc_sr *sre, gva_t eaddr,
111                                     bool primary)
112 {
113         return ((eaddr & 0x0fffffff) >> 22) | (sre->vsid << 7) |
114                (primary ? 0 : 0x40) | 0x80000000;
115 }
116
117 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
118                                           struct kvmppc_pte *pte, bool data)
119 {
120         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
121         struct kvmppc_bat *bat;
122         int i;
123
124         for (i = 0; i < 8; i++) {
125                 if (data)
126                         bat = &vcpu_book3s->dbat[i];
127                 else
128                         bat = &vcpu_book3s->ibat[i];
129
130                 if (vcpu->arch.msr & MSR_PR) {
131                         if (!bat->vp)
132                                 continue;
133                 } else {
134                         if (!bat->vs)
135                                 continue;
136                 }
137
138                 if (check_debug_ip(vcpu))
139                 {
140                         dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
141                                     data ? 'd' : 'i', i, eaddr, bat->bepi,
142                                     bat->bepi_mask);
143                 }
144                 if ((eaddr & bat->bepi_mask) == bat->bepi) {
145                         pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
146                         pte->vpage = (eaddr >> 12) | VSID_BAT;
147                         pte->may_read = bat->pp;
148                         pte->may_write = bat->pp > 1;
149                         pte->may_execute = true;
150                         if (!pte->may_read) {
151                                 printk(KERN_INFO "BAT is not readable!\n");
152                                 continue;
153                         }
154                         if (!pte->may_write) {
155                                 /* let's treat r/o BATs as not-readable for now */
156                                 dprintk_pte("BAT is read-only!\n");
157                                 continue;
158                         }
159
160                         return 0;
161                 }
162         }
163
164         return -ENOENT;
165 }
166
167 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
168                                      struct kvmppc_pte *pte, bool data,
169                                      bool primary)
170 {
171         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
172         struct kvmppc_sr *sre;
173         hva_t ptegp;
174         u32 pteg[16];
175         u64 ptem = 0;
176         int i;
177         int found = 0;
178
179         sre = find_sr(vcpu_book3s, eaddr);
180
181         dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
182                     sre->vsid, sre->raw);
183
184         pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
185
186         ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary);
187         if (kvm_is_error_hva(ptegp)) {
188                 printk(KERN_INFO "KVM: Invalid PTEG!\n");
189                 goto no_page_found;
190         }
191
192         ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
193
194         if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
195                 printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp);
196                 goto no_page_found;
197         }
198
199         for (i=0; i<16; i+=2) {
200                 if (ptem == pteg[i]) {
201                         u8 pp;
202
203                         pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF);
204                         pp = pteg[i+1] & 3;
205
206                         if ((sre->Kp &&  (vcpu->arch.msr & MSR_PR)) ||
207                             (sre->Ks && !(vcpu->arch.msr & MSR_PR)))
208                                 pp |= 4;
209
210                         pte->may_write = false;
211                         pte->may_read = false;
212                         pte->may_execute = true;
213                         switch (pp) {
214                                 case 0:
215                                 case 1:
216                                 case 2:
217                                 case 6:
218                                         pte->may_write = true;
219                                 case 3:
220                                 case 5:
221                                 case 7:
222                                         pte->may_read = true;
223                                         break;
224                         }
225
226                         if ( !pte->may_read )
227                                 continue;
228
229                         dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
230                                     pteg[i], pteg[i+1], pp);
231                         found = 1;
232                         break;
233                 }
234         }
235
236         /* Update PTE C and A bits, so the guest's swapper knows we used the
237            page */
238         if (found) {
239                 u32 oldpte = pteg[i+1];
240
241                 if (pte->may_read)
242                         pteg[i+1] |= PTEG_FLAG_ACCESSED;
243                 if (pte->may_write)
244                         pteg[i+1] |= PTEG_FLAG_DIRTY;
245                 else
246                         dprintk_pte("KVM: Mapping read-only page!\n");
247
248                 /* Write back into the PTEG */
249                 if (pteg[i+1] != oldpte)
250                         copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));
251
252                 return 0;
253         }
254
255 no_page_found:
256
257         if (check_debug_ip(vcpu)) {
258                 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
259                             to_book3s(vcpu)->sdr1, ptegp);
260                 for (i=0; i<16; i+=2) {
261                         dprintk_pte("   %02d: 0x%x - 0x%x (0x%llx)\n",
262                                     i, pteg[i], pteg[i+1], ptem);
263                 }
264         }
265
266         return -ENOENT;
267 }
268
269 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
270                                       struct kvmppc_pte *pte, bool data)
271 {
272         int r;
273
274         pte->eaddr = eaddr;
275         r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data);
276         if (r < 0)
277                r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true);
278         if (r < 0)
279                r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false);
280
281         return r;
282 }
283
284
285 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
286 {
287         return to_book3s(vcpu)->sr[srnum].raw;
288 }
289
290 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
291                                         ulong value)
292 {
293         struct kvmppc_sr *sre;
294
295         sre = &to_book3s(vcpu)->sr[srnum];
296
297         /* Flush any left-over shadows from the previous SR */
298
299         /* XXX Not necessary? */
300         /* kvmppc_mmu_pte_flush(vcpu, ((u64)sre->vsid) << 28, 0xf0000000ULL); */
301
302         /* And then put in the new SR */
303         sre->raw = value;
304         sre->vsid = (value & 0x0fffffff);
305         sre->Ks = (value & 0x40000000) ? true : false;
306         sre->Kp = (value & 0x20000000) ? true : false;
307         sre->nx = (value & 0x10000000) ? true : false;
308
309         /* Map the new segment */
310         kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
311 }
312
313 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
314 {
315         kvmppc_mmu_pte_flush(vcpu, ea, ~0xFFFULL);
316 }
317
318 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, u64 esid,
319                                              u64 *vsid)
320 {
321         /* In case we only have one of MSR_IR or MSR_DR set, let's put
322            that in the real-mode context (and hope RM doesn't access
323            high memory) */
324         switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) {
325         case 0:
326                 *vsid = (VSID_REAL >> 16) | esid;
327                 break;
328         case MSR_IR:
329                 *vsid = (VSID_REAL_IR >> 16) | esid;
330                 break;
331         case MSR_DR:
332                 *vsid = (VSID_REAL_DR >> 16) | esid;
333                 break;
334         case MSR_DR|MSR_IR:
335         {
336                 ulong ea;
337                 ea = esid << SID_SHIFT;
338                 *vsid = find_sr(to_book3s(vcpu), ea)->vsid;
339                 break;
340         }
341         default:
342                 BUG();
343         }
344
345         return 0;
346 }
347
348 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
349 {
350         return true;
351 }
352
353
354 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
355 {
356         struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
357
358         mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
359         mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
360         mmu->xlate = kvmppc_mmu_book3s_32_xlate;
361         mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;
362         mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
363         mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
364         mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
365         mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;
366
367         mmu->slbmte = NULL;
368         mmu->slbmfee = NULL;
369         mmu->slbmfev = NULL;
370         mmu->slbie = NULL;
371         mmu->slbia = NULL;
372 }