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book3s_32_mmu.c
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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 <[email protected]>
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_MMU_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 #ifndef SID_SHIFT
49 #define SID_SHIFT 28
50 #endif
51 
52 static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
53 {
54 #ifdef DEBUG_MMU_PTE_IP
55  return vcpu->arch.pc == DEBUG_MMU_PTE_IP;
56 #else
57  return true;
58 #endif
59 }
60 
61 static inline u32 sr_vsid(u32 sr_raw)
62 {
63  return sr_raw & 0x0fffffff;
64 }
65 
66 static inline bool sr_valid(u32 sr_raw)
67 {
68  return (sr_raw & 0x80000000) ? false : true;
69 }
70 
71 static inline bool sr_ks(u32 sr_raw)
72 {
73  return (sr_raw & 0x40000000) ? true: false;
74 }
75 
76 static inline bool sr_kp(u32 sr_raw)
77 {
78  return (sr_raw & 0x20000000) ? true: false;
79 }
80 
81 static inline bool sr_nx(u32 sr_raw)
82 {
83  return (sr_raw & 0x10000000) ? true: false;
84 }
85 
86 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
87  struct kvmppc_pte *pte, bool data);
88 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
89  u64 *vsid);
90 
91 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
92 {
93  return vcpu->arch.shared->sr[(eaddr >> 28) & 0xf];
94 }
95 
96 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
97  bool data)
98 {
99  u64 vsid;
100  struct kvmppc_pte pte;
101 
102  if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data))
103  return pte.vpage;
104 
105  kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
106  return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16);
107 }
108 
109 static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
110 {
111  kvmppc_set_msr(vcpu, 0);
112 }
113 
114 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvmppc_vcpu_book3s *vcpu_book3s,
115  u32 sre, gva_t eaddr,
116  bool primary)
117 {
118  u32 page, hash, pteg, htabmask;
119  hva_t r;
120 
121  page = (eaddr & 0x0FFFFFFF) >> 12;
122  htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;
123 
124  hash = ((sr_vsid(sre) ^ page) << 6);
125  if (!primary)
126  hash = ~hash;
127  hash &= htabmask;
128 
129  pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;
130 
131  dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
132  kvmppc_get_pc(&vcpu_book3s->vcpu), eaddr, vcpu_book3s->sdr1, pteg,
133  sr_vsid(sre));
134 
135  r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
136  if (kvm_is_error_hva(r))
137  return r;
138  return r | (pteg & ~PAGE_MASK);
139 }
140 
141 static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary)
142 {
143  return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) |
144  (primary ? 0 : 0x40) | 0x80000000;
145 }
146 
147 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
148  struct kvmppc_pte *pte, bool data)
149 {
150  struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
151  struct kvmppc_bat *bat;
152  int i;
153 
154  for (i = 0; i < 8; i++) {
155  if (data)
156  bat = &vcpu_book3s->dbat[i];
157  else
158  bat = &vcpu_book3s->ibat[i];
159 
160  if (vcpu->arch.shared->msr & MSR_PR) {
161  if (!bat->vp)
162  continue;
163  } else {
164  if (!bat->vs)
165  continue;
166  }
167 
168  if (check_debug_ip(vcpu))
169  {
170  dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
171  data ? 'd' : 'i', i, eaddr, bat->bepi,
172  bat->bepi_mask);
173  }
174  if ((eaddr & bat->bepi_mask) == bat->bepi) {
175  u64 vsid;
176  kvmppc_mmu_book3s_32_esid_to_vsid(vcpu,
177  eaddr >> SID_SHIFT, &vsid);
178  vsid <<= 16;
179  pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid;
180 
181  pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
182  pte->may_read = bat->pp;
183  pte->may_write = bat->pp > 1;
184  pte->may_execute = true;
185  if (!pte->may_read) {
186  printk(KERN_INFO "BAT is not readable!\n");
187  continue;
188  }
189  if (!pte->may_write) {
190  /* let's treat r/o BATs as not-readable for now */
191  dprintk_pte("BAT is read-only!\n");
192  continue;
193  }
194 
195  return 0;
196  }
197  }
198 
199  return -ENOENT;
200 }
201 
202 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
203  struct kvmppc_pte *pte, bool data,
204  bool primary)
205 {
206  struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
207  u32 sre;
208  hva_t ptegp;
209  u32 pteg[16];
210  u32 ptem = 0;
211  int i;
212  int found = 0;
213 
214  sre = find_sr(vcpu, eaddr);
215 
216  dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
217  sr_vsid(sre), sre);
218 
219  pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
220 
221  ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu_book3s, sre, eaddr, primary);
222  if (kvm_is_error_hva(ptegp)) {
223  printk(KERN_INFO "KVM: Invalid PTEG!\n");
224  goto no_page_found;
225  }
226 
227  ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
228 
229  if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
230  printk(KERN_ERR "KVM: Can't copy data from 0x%lx!\n", ptegp);
231  goto no_page_found;
232  }
233 
234  for (i=0; i<16; i+=2) {
235  if (ptem == pteg[i]) {
236  u8 pp;
237 
238  pte->raddr = (pteg[i+1] & ~(0xFFFULL)) | (eaddr & 0xFFF);
239  pp = pteg[i+1] & 3;
240 
241  if ((sr_kp(sre) && (vcpu->arch.shared->msr & MSR_PR)) ||
242  (sr_ks(sre) && !(vcpu->arch.shared->msr & MSR_PR)))
243  pp |= 4;
244 
245  pte->may_write = false;
246  pte->may_read = false;
247  pte->may_execute = true;
248  switch (pp) {
249  case 0:
250  case 1:
251  case 2:
252  case 6:
253  pte->may_write = true;
254  case 3:
255  case 5:
256  case 7:
257  pte->may_read = true;
258  break;
259  }
260 
261  if ( !pte->may_read )
262  continue;
263 
264  dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
265  pteg[i], pteg[i+1], pp);
266  found = 1;
267  break;
268  }
269  }
270 
271  /* Update PTE C and A bits, so the guest's swapper knows we used the
272  page */
273  if (found) {
274  u32 oldpte = pteg[i+1];
275 
276  if (pte->may_read)
277  pteg[i+1] |= PTEG_FLAG_ACCESSED;
278  if (pte->may_write)
279  pteg[i+1] |= PTEG_FLAG_DIRTY;
280  else
281  dprintk_pte("KVM: Mapping read-only page!\n");
282 
283  /* Write back into the PTEG */
284  if (pteg[i+1] != oldpte)
285  copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));
286 
287  return 0;
288  }
289 
290 no_page_found:
291 
292  if (check_debug_ip(vcpu)) {
293  dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
294  to_book3s(vcpu)->sdr1, ptegp);
295  for (i=0; i<16; i+=2) {
296  dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n",
297  i, pteg[i], pteg[i+1], ptem);
298  }
299  }
300 
301  return -ENOENT;
302 }
303 
304 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
305  struct kvmppc_pte *pte, bool data)
306 {
307  int r;
308  ulong mp_ea = vcpu->arch.magic_page_ea;
309 
310  pte->eaddr = eaddr;
311 
312  /* Magic page override */
313  if (unlikely(mp_ea) &&
314  unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
315  !(vcpu->arch.shared->msr & MSR_PR)) {
316  pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
317  pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
318  pte->raddr &= KVM_PAM;
319  pte->may_execute = true;
320  pte->may_read = true;
321  pte->may_write = true;
322 
323  return 0;
324  }
325 
326  r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data);
327  if (r < 0)
328  r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, true);
329  if (r < 0)
330  r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte, data, false);
331 
332  return r;
333 }
334 
335 
336 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
337 {
338  return vcpu->arch.shared->sr[srnum];
339 }
340 
341 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
342  ulong value)
343 {
344  vcpu->arch.shared->sr[srnum] = value;
345  kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
346 }
347 
348 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
349 {
350  kvmppc_mmu_pte_flush(vcpu, ea, 0x0FFFF000);
351 }
352 
353 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
354  u64 *vsid)
355 {
356  ulong ea = esid << SID_SHIFT;
357  u32 sr;
358  u64 gvsid = esid;
359 
360  if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
361  sr = find_sr(vcpu, ea);
362  if (sr_valid(sr))
363  gvsid = sr_vsid(sr);
364  }
365 
366  /* In case we only have one of MSR_IR or MSR_DR set, let's put
367  that in the real-mode context (and hope RM doesn't access
368  high memory) */
369  switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
370  case 0:
371  *vsid = VSID_REAL | esid;
372  break;
373  case MSR_IR:
374  *vsid = VSID_REAL_IR | gvsid;
375  break;
376  case MSR_DR:
377  *vsid = VSID_REAL_DR | gvsid;
378  break;
379  case MSR_DR|MSR_IR:
380  if (sr_valid(sr))
381  *vsid = sr_vsid(sr);
382  else
383  *vsid = VSID_BAT | gvsid;
384  break;
385  default:
386  BUG();
387  }
388 
389  if (vcpu->arch.shared->msr & MSR_PR)
390  *vsid |= VSID_PR;
391 
392  return 0;
393 }
394 
395 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
396 {
397  return true;
398 }
399 
400 
401 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
402 {
403  struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
404 
405  mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
406  mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
407  mmu->xlate = kvmppc_mmu_book3s_32_xlate;
408  mmu->reset_msr = kvmppc_mmu_book3s_32_reset_msr;
409  mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
410  mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
411  mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
412  mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;
413 
414  mmu->slbmte = NULL;
415  mmu->slbmfee = NULL;
416  mmu->slbmfev = NULL;
417  mmu->slbie = NULL;
418  mmu->slbia = NULL;
419 }
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