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Linux kernel mirror (for testing)
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linux
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
40static 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
49static inline u32 sr_vsid(u32 sr_raw)
50{
51 return sr_raw & 0x0fffffff;
52}
53
54static inline bool sr_valid(u32 sr_raw)
55{
56 return (sr_raw & 0x80000000) ? false : true;
57}
58
59static inline bool sr_ks(u32 sr_raw)
60{
61 return (sr_raw & 0x40000000) ? true: false;
62}
63
64static inline bool sr_kp(u32 sr_raw)
65{
66 return (sr_raw & 0x20000000) ? true: false;
67}
68
69static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
70 struct kvmppc_pte *pte, bool data,
71 bool iswrite);
72static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
73 u64 *vsid);
74
75static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
76{
77 return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf);
78}
79
80static 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
93static void kvmppc_mmu_book3s_32_reset_msr(struct kvm_vcpu *vcpu)
94{
95 kvmppc_set_msr(vcpu, 0);
96}
97
98static hva_t kvmppc_mmu_book3s_32_get_pteg(struct kvm_vcpu *vcpu,
99 u32 sre, gva_t eaddr,
100 bool primary)
101{
102 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
103 u32 page, hash, pteg, htabmask;
104 hva_t r;
105
106 page = (eaddr & 0x0FFFFFFF) >> 12;
107 htabmask = ((vcpu_book3s->sdr1 & 0x1FF) << 16) | 0xFFC0;
108
109 hash = ((sr_vsid(sre) ^ page) << 6);
110 if (!primary)
111 hash = ~hash;
112 hash &= htabmask;
113
114 pteg = (vcpu_book3s->sdr1 & 0xffff0000) | hash;
115
116 dprintk("MMU: pc=0x%lx eaddr=0x%lx sdr1=0x%llx pteg=0x%x vsid=0x%x\n",
117 kvmppc_get_pc(vcpu), eaddr, vcpu_book3s->sdr1, pteg,
118 sr_vsid(sre));
119
120 r = gfn_to_hva(vcpu->kvm, pteg >> PAGE_SHIFT);
121 if (kvm_is_error_hva(r))
122 return r;
123 return r | (pteg & ~PAGE_MASK);
124}
125
126static u32 kvmppc_mmu_book3s_32_get_ptem(u32 sre, gva_t eaddr, bool primary)
127{
128 return ((eaddr & 0x0fffffff) >> 22) | (sr_vsid(sre) << 7) |
129 (primary ? 0 : 0x40) | 0x80000000;
130}
131
132static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
133 struct kvmppc_pte *pte, bool data,
134 bool iswrite)
135{
136 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
137 struct kvmppc_bat *bat;
138 int i;
139
140 for (i = 0; i < 8; i++) {
141 if (data)
142 bat = &vcpu_book3s->dbat[i];
143 else
144 bat = &vcpu_book3s->ibat[i];
145
146 if (kvmppc_get_msr(vcpu) & MSR_PR) {
147 if (!bat->vp)
148 continue;
149 } else {
150 if (!bat->vs)
151 continue;
152 }
153
154 if (check_debug_ip(vcpu))
155 {
156 dprintk_pte("%cBAT %02d: 0x%lx - 0x%x (0x%x)\n",
157 data ? 'd' : 'i', i, eaddr, bat->bepi,
158 bat->bepi_mask);
159 }
160 if ((eaddr & bat->bepi_mask) == bat->bepi) {
161 u64 vsid;
162 kvmppc_mmu_book3s_32_esid_to_vsid(vcpu,
163 eaddr >> SID_SHIFT, &vsid);
164 vsid <<= 16;
165 pte->vpage = (((u64)eaddr >> 12) & 0xffff) | vsid;
166
167 pte->raddr = bat->brpn | (eaddr & ~bat->bepi_mask);
168 pte->may_read = bat->pp;
169 pte->may_write = bat->pp > 1;
170 pte->may_execute = true;
171 if (!pte->may_read) {
172 printk(KERN_INFO "BAT is not readable!\n");
173 continue;
174 }
175 if (iswrite && !pte->may_write) {
176 dprintk_pte("BAT is read-only!\n");
177 continue;
178 }
179
180 return 0;
181 }
182 }
183
184 return -ENOENT;
185}
186
187static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
188 struct kvmppc_pte *pte, bool data,
189 bool iswrite, bool primary)
190{
191 u32 sre;
192 hva_t ptegp;
193 u32 pteg[16];
194 u32 pte0, pte1;
195 u32 ptem = 0;
196 int i;
197 int found = 0;
198
199 sre = find_sr(vcpu, eaddr);
200
201 dprintk_pte("SR 0x%lx: vsid=0x%x, raw=0x%x\n", eaddr >> 28,
202 sr_vsid(sre), sre);
203
204 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
205
206 ptegp = kvmppc_mmu_book3s_32_get_pteg(vcpu, sre, eaddr, primary);
207 if (kvm_is_error_hva(ptegp)) {
208 printk(KERN_INFO "KVM: Invalid PTEG!\n");
209 goto no_page_found;
210 }
211
212 ptem = kvmppc_mmu_book3s_32_get_ptem(sre, eaddr, primary);
213
214 if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
215 printk_ratelimited(KERN_ERR
216 "KVM: Can't copy data from 0x%lx!\n", ptegp);
217 goto no_page_found;
218 }
219
220 for (i=0; i<16; i+=2) {
221 pte0 = be32_to_cpu(pteg[i]);
222 pte1 = be32_to_cpu(pteg[i + 1]);
223 if (ptem == pte0) {
224 u8 pp;
225
226 pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF);
227 pp = pte1 & 3;
228
229 if ((sr_kp(sre) && (kvmppc_get_msr(vcpu) & MSR_PR)) ||
230 (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR)))
231 pp |= 4;
232
233 pte->may_write = false;
234 pte->may_read = false;
235 pte->may_execute = true;
236 switch (pp) {
237 case 0:
238 case 1:
239 case 2:
240 case 6:
241 pte->may_write = true;
242 case 3:
243 case 5:
244 case 7:
245 pte->may_read = true;
246 break;
247 }
248
249 dprintk_pte("MMU: Found PTE -> %x %x - %x\n",
250 pte0, pte1, pp);
251 found = 1;
252 break;
253 }
254 }
255
256 /* Update PTE C and A bits, so the guest's swapper knows we used the
257 page */
258 if (found) {
259 u32 pte_r = pte1;
260 char __user *addr = (char __user *) (ptegp + (i+1) * sizeof(u32));
261
262 /*
263 * Use single-byte writes to update the HPTE, to
264 * conform to what real hardware does.
265 */
266 if (pte->may_read && !(pte_r & PTEG_FLAG_ACCESSED)) {
267 pte_r |= PTEG_FLAG_ACCESSED;
268 put_user(pte_r >> 8, addr + 2);
269 }
270 if (iswrite && pte->may_write && !(pte_r & PTEG_FLAG_DIRTY)) {
271 pte_r |= PTEG_FLAG_DIRTY;
272 put_user(pte_r, addr + 3);
273 }
274 if (!pte->may_read || (iswrite && !pte->may_write))
275 return -EPERM;
276 return 0;
277 }
278
279no_page_found:
280
281 if (check_debug_ip(vcpu)) {
282 dprintk_pte("KVM MMU: No PTE found (sdr1=0x%llx ptegp=0x%lx)\n",
283 to_book3s(vcpu)->sdr1, ptegp);
284 for (i=0; i<16; i+=2) {
285 dprintk_pte(" %02d: 0x%x - 0x%x (0x%x)\n",
286 i, be32_to_cpu(pteg[i]),
287 be32_to_cpu(pteg[i+1]), ptem);
288 }
289 }
290
291 return -ENOENT;
292}
293
294static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
295 struct kvmppc_pte *pte, bool data,
296 bool iswrite)
297{
298 int r;
299 ulong mp_ea = vcpu->arch.magic_page_ea;
300
301 pte->eaddr = eaddr;
302 pte->page_size = MMU_PAGE_4K;
303
304 /* Magic page override */
305 if (unlikely(mp_ea) &&
306 unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
307 !(kvmppc_get_msr(vcpu) & MSR_PR)) {
308 pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
309 pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
310 pte->raddr &= KVM_PAM;
311 pte->may_execute = true;
312 pte->may_read = true;
313 pte->may_write = true;
314
315 return 0;
316 }
317
318 r = kvmppc_mmu_book3s_32_xlate_bat(vcpu, eaddr, pte, data, iswrite);
319 if (r < 0)
320 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
321 data, iswrite, true);
322 if (r == -ENOENT)
323 r = kvmppc_mmu_book3s_32_xlate_pte(vcpu, eaddr, pte,
324 data, iswrite, false);
325
326 return r;
327}
328
329
330static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
331{
332 return kvmppc_get_sr(vcpu, srnum);
333}
334
335static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
336 ulong value)
337{
338 kvmppc_set_sr(vcpu, srnum, value);
339 kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
340}
341
342static void kvmppc_mmu_book3s_32_tlbie(struct kvm_vcpu *vcpu, ulong ea, bool large)
343{
344 int i;
345 struct kvm_vcpu *v;
346
347 /* flush this VA on all cpus */
348 kvm_for_each_vcpu(i, v, vcpu->kvm)
349 kvmppc_mmu_pte_flush(v, ea, 0x0FFFF000);
350}
351
352static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
353 u64 *vsid)
354{
355 ulong ea = esid << SID_SHIFT;
356 u32 sr;
357 u64 gvsid = esid;
358 u64 msr = kvmppc_get_msr(vcpu);
359
360 if (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 (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 (msr & MSR_PR)
390 *vsid |= VSID_PR;
391
392 return 0;
393}
394
395static bool kvmppc_mmu_book3s_32_is_dcbz32(struct kvm_vcpu *vcpu)
396{
397 return true;
398}
399
400
401void 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->slbfee = NULL;
418 mmu->slbie = NULL;
419 mmu->slbia = NULL;
420}