GNU Linux-libre 5.15.72-gnu
[releases.git] / arch / powerpc / kvm / book3s_32_mmu.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *
4  * Copyright SUSE Linux Products GmbH 2009
5  *
6  * Authors: Alexander Graf <agraf@suse.de>
7  */
8
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/kvm.h>
12 #include <linux/kvm_host.h>
13 #include <linux/highmem.h>
14
15 #include <asm/kvm_ppc.h>
16 #include <asm/kvm_book3s.h>
17
18 /* #define DEBUG_MMU */
19 /* #define DEBUG_MMU_PTE */
20 /* #define DEBUG_MMU_PTE_IP 0xfff14c40 */
21
22 #ifdef DEBUG_MMU
23 #define dprintk(X...) printk(KERN_INFO X)
24 #else
25 #define dprintk(X...) do { } while(0)
26 #endif
27
28 #ifdef DEBUG_MMU_PTE
29 #define dprintk_pte(X...) printk(KERN_INFO X)
30 #else
31 #define dprintk_pte(X...) do { } while(0)
32 #endif
33
34 #define PTEG_FLAG_ACCESSED      0x00000100
35 #define PTEG_FLAG_DIRTY         0x00000080
36 #ifndef SID_SHIFT
37 #define SID_SHIFT               28
38 #endif
39
40 static inline bool check_debug_ip(struct kvm_vcpu *vcpu)
41 {
42 #ifdef DEBUG_MMU_PTE_IP
43         return vcpu->arch.regs.nip == DEBUG_MMU_PTE_IP;
44 #else
45         return true;
46 #endif
47 }
48
49 static inline u32 sr_vsid(u32 sr_raw)
50 {
51         return sr_raw & 0x0fffffff;
52 }
53
54 static inline bool sr_valid(u32 sr_raw)
55 {
56         return (sr_raw & 0x80000000) ? false : true;
57 }
58
59 static inline bool sr_ks(u32 sr_raw)
60 {
61         return (sr_raw & 0x40000000) ? true: false;
62 }
63
64 static inline bool sr_kp(u32 sr_raw)
65 {
66         return (sr_raw & 0x20000000) ? true: false;
67 }
68
69 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
70                                           struct kvmppc_pte *pte, bool data,
71                                           bool iswrite);
72 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
73                                              u64 *vsid);
74
75 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
76 {
77         return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf);
78 }
79
80 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
81                                          bool data)
82 {
83         u64 vsid;
84         struct kvmppc_pte pte;
85
86         if (!kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, &pte, data, false))
87                 return pte.vpage;
88
89         kvmppc_mmu_book3s_32_esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
90         return (((u64)eaddr >> 12) & 0xffff) | (vsid << 16);
91 }
92
93 static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu,
94                                       u32 sre, gva_t eaddr,
95                                       bool primary)
96 {
97         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
98         u32 page, hash, pteg, htabmask;
99         hva_t r;
100
101         page = (eaddr & 0x0FFFFFFF) >> 12;
102         htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;
103
104         hash = ((sr_vsid(sre) ^ page) << 6);
105         if (!primary)
106                 hash = ~hash;
107         hash &= htabmask;
108
109         pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;
110
111         dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
112                 kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg,
113                 sr_vsid(sre));
114
115         r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
116         if (kvm_is_error_hva(r))
117                 return r;
118         return r | (pteg & ~PAGE_MASK);
119 }
120
121 static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary)
122 {
123         return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) |
124                (primary ? 0 : 0x40) | 0x80000000;
125 }
126
127 static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
128                                           struct kvmppc_pte *pte, bool data,
129                                           bool iswrite)
130 {
131         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
132         struct kvmppc_bat *bat;
133         int i;
134
135         for (i = 0; i < 8; i++) {
136                 if (data)
137                         bat = &vcpu_book3s->dbat[i];
138                 else
139                         bat = &vcpu_book3s->ibat[i];
140
141                 if (kvmppc_get_msr(vcpu) & MSR_PR) {
142                         if (!bat->vp)
143                                 continue;
144                 } else {
145                         if (!bat->vs)
146                                 continue;
147                 }
148
149                 if (check_debug_ip(vcpu))
150                 {
151                         dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
152                                     data ? 'd' : 'i', i, eaddr, bat->bepi,
153                                     bat->bepi_mask);
154                 }
155                 if ((eaddr & bat->bepi_mask) == bat->bepi) {
156                         u64 vsid;
157                         kvmppc_mmu_book3s_32_esid_to_vsid(vcpu,
158                                 eaddr >> SID_SHIFT, &vsid);
159                         vsid <<= 16;
160                         pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid;
161
162                         pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
163                         pte->may_read = bat->pp;
164                         pte->may_write = bat->pp > 1;
165                         pte->may_execute = true;
166                         if (!pte->may_read) {
167                                 printk(KERN_INFO "BAT is not readable!\n");
168                                 continue;
169                         }
170                         if (iswrite && !pte->may_write) {
171                                 dprintk_pte("BAT is read-only!\n");
172                                 continue;
173                         }
174
175                         return 0;
176                 }
177         }
178
179         return -ENOENT;
180 }
181
182 static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
183                                      struct kvmppc_pte *pte, bool data,
184                                      bool iswrite, bool primary)
185 {
186         u32 sre;
187         hva_t ptegp;
188         u32 pteg[16];
189         u32 pte0, pte1;
190         u32 ptem = 0;
191         int i;
192         int found = 0;
193
194         sre = find_sr(vcpu, eaddr);
195
196         dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
197                     sr_vsid(sre), sre);
198
199         pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
200
201         ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary);
202         if (kvm_is_error_hva(ptegp)) {
203                 printk(KERN_INFO "KVM: Invalid PTEG!\n");
204                 goto no_page_found;
205         }
206
207         ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
208
209         if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
210                 printk_ratelimited(KERN_ERR
211                         "KVM: Can't copy data from 0x%lx!\n", ptegp);
212                 goto no_page_found;
213         }
214
215         for (i=0; i<16; i+=2) {
216                 pte0 = be32_to_cpu(pteg[i]);
217                 pte1 = be32_to_cpu(pteg[i + 1]);
218                 if (ptem == pte0) {
219                         u8 pp;
220
221                         pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF);
222                         pp = pte1 & 3;
223
224                         if ((sr_kp(sre) &&  (kvmppc_get_msr(vcpu) & MSR_PR)) ||
225                             (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR)))
226                                 pp |= 4;
227
228                         pte->may_write = false;
229                         pte->may_read = false;
230                         pte->may_execute = true;
231                         switch (pp) {
232                                 case 0:
233                                 case 1:
234                                 case 2:
235                                 case 6:
236                                         pte->may_write = true;
237                                         fallthrough;
238                                 case 3:
239                                 case 5:
240                                 case 7:
241                                         pte->may_read = true;
242                                         break;
243                         }
244
245                         dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
246                                     pte0, pte1, pp);
247                         found = 1;
248                         break;
249                 }
250         }
251
252         /* Update PTE C and A bits, so the guest's swapper knows we used the
253            page */
254         if (found) {
255                 u32 pte_r = pte1;
256                 char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32));
257
258                 /*
259                  * Use single-byte writes to update the HPTE, to
260                  * conform to what real hardware does.
261                  */
262                 if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) {
263                         pte_r |= PTEG_FLAG_ACCESSED;
264                         put_user(pte_r >> 8, addr + 2);
265                 }
266                 if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) {
267                         pte_r |= PTEG_FLAG_DIRTY;
268                         put_user(pte_r, addr + 3);
269                 }
270                 if (!pte->may_read || (iswrite && !pte->may_write))
271                         return -EPERM;
272                 return 0;
273         }
274
275 no_page_found:
276
277         if (check_debug_ip(vcpu)) {
278                 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
279                             to_book3s(vcpu)->sdr1, ptegp);
280                 for (i=0; i<16; i+=2) {
281                         dprintk_pte("   %02d: 0x%x - 0x%x (0x%x)\n",
282                                     i, be32_to_cpu(pteg[i]),
283                                     be32_to_cpu(pteg[i+1]), ptem);
284                 }
285         }
286
287         return -ENOENT;
288 }
289
290 static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
291                                       struct kvmppc_pte *pte, bool data,
292                                       bool iswrite)
293 {
294         int r;
295         ulong mp_ea = vcpu->arch.magic_page_ea;
296
297         pte->eaddr = eaddr;
298         pte->page_size = MMU_PAGE_4K;
299
300         /* Magic page override */
301         if (unlikely(mp_ea) &&
302             unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
303             !(kvmppc_get_msr(vcpu) & MSR_PR)) {
304                 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
305                 pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
306                 pte->raddr &= KVM_PAM;
307                 pte->may_execute = true;
308                 pte->may_read = true;
309                 pte->may_write = true;
310
311                 return 0;
312         }
313
314         r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite);
315         if (r < 0)
316                 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
317                                                    data, iswrite, true);
318         if (r == -ENOENT)
319                 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
320                                                    data, iswrite, false);
321
322         return r;
323 }
324
325
326 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
327 {
328         return kvmppc_get_sr(vcpu, srnum);
329 }
330
331 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
332                                         ulong value)
333 {
334         kvmppc_set_sr(vcpu, srnum, value);
335         kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
336 }
337
338 static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
339 {
340         int i;
341         struct kvm_vcpu *v;
342
343         /* flush this VA on all cpus */
344         kvm_for_each_vcpu(i, v, vcpu->kvm)
345                 kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000);
346 }
347
348 static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
349                                              u64 *vsid)
350 {
351         ulong ea = esid << SID_SHIFT;
352         u32 sr;
353         u64 gvsid = esid;
354         u64 msr = kvmppc_get_msr(vcpu);
355
356         if (msr & (MSR_DR|MSR_IR)) {
357                 sr = find_sr(vcpu, ea);
358                 if (sr_valid(sr))
359                         gvsid = sr_vsid(sr);
360         }
361
362         /* In case we only have one of MSR_IR or MSR_DR set, let's put
363            that in the real-mode context (and hope RM doesn't access
364            high memory) */
365         switch (msr & (MSR_DR|MSR_IR)) {
366         case 0:
367                 *vsid = VSID_REAL | esid;
368                 break;
369         case MSR_IR:
370                 *vsid = VSID_REAL_IR | gvsid;
371                 break;
372         case MSR_DR:
373                 *vsid = VSID_REAL_DR | gvsid;
374                 break;
375         case MSR_DR|MSR_IR:
376                 if (sr_valid(sr))
377                         *vsid = sr_vsid(sr);
378                 else
379                         *vsid = VSID_BAT | gvsid;
380                 break;
381         default:
382                 BUG();
383         }
384
385         if (msr & MSR_PR)
386                 *vsid |= VSID_PR;
387
388         return 0;
389 }
390
391 static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
392 {
393         return true;
394 }
395
396
397 void kvmppc_mmu_book3s_32_init(struct kvm_vcpu *vcpu)
398 {
399         struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
400
401         mmu->mtsrin = kvmppc_mmu_book3s_32_mtsrin;
402         mmu->mfsrin = kvmppc_mmu_book3s_32_mfsrin;
403         mmu->xlate = kvmppc_mmu_book3s_32_xlate;
404         mmu->tlbie = kvmppc_mmu_book3s_32_tlbie;
405         mmu->esid_to_vsid = kvmppc_mmu_book3s_32_esid_to_vsid;
406         mmu->ea_to_vp = kvmppc_mmu_book3s_32_ea_to_vp;
407         mmu->is_dcbz32 = kvmppc_mmu_book3s_32_is_dcbz32;
408
409         mmu->slbmte = NULL;
410         mmu->slbmfee = NULL;
411         mmu->slbmfev = NULL;
412         mmu->slbfee = NULL;
413         mmu->slbie = NULL;
414         mmu->slbia = NULL;
415 }