1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
4 *
5 * Authors:
6 * Alexander Graf <agraf@suse.de>
7 */
8
9#include <linux/kvm_host.h>
10
11#include <asm/kvm_ppc.h>
12#include <asm/kvm_book3s.h>
13#include <asm/book3s/32/mmu-hash.h>
14#include <asm/machdep.h>
15#include <asm/mmu_context.h>
16#include <asm/hw_irq.h>
17#include "book3s.h"
18
19/* #define DEBUG_MMU */
20/* #define DEBUG_SR */
21
22#ifdef DEBUG_MMU
23#define dprintk_mmu(a, ...) printk(KERN_INFO a, __VA_ARGS__)
24#else
25#define dprintk_mmu(a, ...) do { } while(0)
26#endif
27
28#ifdef DEBUG_SR
29#define dprintk_sr(a, ...) printk(KERN_INFO a, __VA_ARGS__)
30#else
31#define dprintk_sr(a, ...) do { } while(0)
32#endif
33
34#if PAGE_SHIFT != 12
35#error Unknown page size
36#endif
37
38#ifdef CONFIG_SMP
39#error XXX need to grab mmu_hash_lock
40#endif
41
42#ifdef CONFIG_PTE_64BIT
43#error Only 32 bit pages are supported for now
44#endif
45
46static ulong htab;
47static u32 htabmask;
48
49void kvmppc_mmu_invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
50{
51 volatile u32 *pteg;
52
53 /* Remove from host HTAB */
54 pteg = (u32*)pte->slot;
55 pteg[0] = 0;
56
57 /* And make sure it's gone from the TLB too */
58 asm volatile ("sync");
59 asm volatile ("tlbie %0" : : "r" (pte->pte.eaddr) : "memory");
60 asm volatile ("sync");
61 asm volatile ("tlbsync");
62}
63
64/* We keep 512 gvsid->hvsid entries, mapping the guest ones to the array using
65 * a hash, so we don't waste cycles on looping */
66static u16 kvmppc_sid_hash(struct kvm_vcpu *vcpu, u64 gvsid)
67{
68 return (u16)(((gvsid >> (SID_MAP_BITS * 7)) & SID_MAP_MASK) ^
69 ((gvsid >> (SID_MAP_BITS * 6)) & SID_MAP_MASK) ^
70 ((gvsid >> (SID_MAP_BITS * 5)) & SID_MAP_MASK) ^
71 ((gvsid >> (SID_MAP_BITS * 4)) & SID_MAP_MASK) ^
72 ((gvsid >> (SID_MAP_BITS * 3)) & SID_MAP_MASK) ^
73 ((gvsid >> (SID_MAP_BITS * 2)) & SID_MAP_MASK) ^
74 ((gvsid >> (SID_MAP_BITS * 1)) & SID_MAP_MASK) ^
75 ((gvsid >> (SID_MAP_BITS * 0)) & SID_MAP_MASK));
76}
77
78
79static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
80{
81 struct kvmppc_sid_map *map;
82 u16 sid_map_mask;
83
84 if (kvmppc_get_msr(vcpu) & MSR_PR)
85 gvsid |= VSID_PR;
86
87 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
88 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
89 if (map->guest_vsid == gvsid) {
90 dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n",
91 gvsid, map->host_vsid);
92 return map;
93 }
94
95 map = &to_book3s(vcpu)->sid_map[SID_MAP_MASK - sid_map_mask];
96 if (map->guest_vsid == gvsid) {
97 dprintk_sr("SR: Searching 0x%llx -> 0x%llx\n",
98 gvsid, map->host_vsid);
99 return map;
100 }
101
102 dprintk_sr("SR: Searching 0x%llx -> not found\n", gvsid);
103 return NULL;
104}
105
106static u32 *kvmppc_mmu_get_pteg(struct kvm_vcpu *vcpu, u32 vsid, u32 eaddr,
107 bool primary)
108{
109 u32 page, hash;
110 ulong pteg = htab;
111
112 page = (eaddr & ~ESID_MASK) >> 12;
113
114 hash = ((vsid ^ page) << 6);
115 if (!primary)
116 hash = ~hash;
117
118 hash &= htabmask;
119
120 pteg |= hash;
121
122 dprintk_mmu("htab: %lx | hash: %x | htabmask: %x | pteg: %lx\n",
123 htab, hash, htabmask, pteg);
124
125 return (u32*)pteg;
126}
127
128int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte,
129 bool iswrite)
130{
131 struct page *page;
132 kvm_pfn_t hpaddr;
133 u64 vpn;
134 u64 vsid;
135 struct kvmppc_sid_map *map;
136 volatile u32 *pteg;
137 u32 eaddr = orig_pte->eaddr;
138 u32 pteg0, pteg1;
139 register int rr = 0;
140 bool primary = false;
141 bool evict = false;
142 struct hpte_cache *pte;
143 int r = 0;
144 bool writable;
145
146 /* Get host physical address for gpa */
147 hpaddr = kvmppc_gpa_to_pfn(vcpu, orig_pte->raddr, iswrite, &writable, &page);
148 if (is_error_noslot_pfn(pfn: hpaddr)) {
149 printk(KERN_INFO "Couldn't get guest page for gpa %lx!\n",
150 orig_pte->raddr);
151 r = -EINVAL;
152 goto out;
153 }
154 hpaddr <<= PAGE_SHIFT;
155
156 /* and write the mapping ea -> hpa into the pt */
157 vcpu->arch.mmu.esid_to_vsid(vcpu, orig_pte->eaddr >> SID_SHIFT, &vsid);
158 map = find_sid_vsid(vcpu, gvsid: vsid);
159 if (!map) {
160 kvmppc_mmu_map_segment(vcpu, eaddr);
161 map = find_sid_vsid(vcpu, gvsid: vsid);
162 }
163 BUG_ON(!map);
164
165 vsid = map->host_vsid;
166 vpn = (vsid << (SID_SHIFT - VPN_SHIFT)) |
167 ((eaddr & ~ESID_MASK) >> VPN_SHIFT);
168next_pteg:
169 if (rr == 16) {
170 primary = !primary;
171 evict = true;
172 rr = 0;
173 }
174
175 pteg = kvmppc_mmu_get_pteg(vcpu, vsid, eaddr, primary);
176
177 /* not evicting yet */
178 if (!evict && (pteg[rr] & PTE_V)) {
179 rr += 2;
180 goto next_pteg;
181 }
182
183 dprintk_mmu("KVM: old PTEG: %p (%d)\n", pteg, rr);
184 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
185 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
186 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
187 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
188 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
189 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
190 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
191 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
192
193 pteg0 = ((eaddr & 0x0fffffff) >> 22) | (vsid << 7) | PTE_V |
194 (primary ? 0 : PTE_SEC);
195 pteg1 = hpaddr | PTE_M | PTE_R | PTE_C;
196
197 if (orig_pte->may_write && writable) {
198 pteg1 |= PP_RWRW;
199 mark_page_dirty(kvm: vcpu->kvm, gfn: orig_pte->raddr >> PAGE_SHIFT);
200 } else {
201 pteg1 |= PP_RWRX;
202 }
203
204 if (orig_pte->may_execute)
205 kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
206
207 local_irq_disable();
208
209 if (pteg[rr]) {
210 pteg[rr] = 0;
211 asm volatile ("sync");
212 }
213 pteg[rr + 1] = pteg1;
214 pteg[rr] = pteg0;
215 asm volatile ("sync");
216
217 local_irq_enable();
218
219 dprintk_mmu("KVM: new PTEG: %p\n", pteg);
220 dprintk_mmu("KVM: %08x - %08x\n", pteg[0], pteg[1]);
221 dprintk_mmu("KVM: %08x - %08x\n", pteg[2], pteg[3]);
222 dprintk_mmu("KVM: %08x - %08x\n", pteg[4], pteg[5]);
223 dprintk_mmu("KVM: %08x - %08x\n", pteg[6], pteg[7]);
224 dprintk_mmu("KVM: %08x - %08x\n", pteg[8], pteg[9]);
225 dprintk_mmu("KVM: %08x - %08x\n", pteg[10], pteg[11]);
226 dprintk_mmu("KVM: %08x - %08x\n", pteg[12], pteg[13]);
227 dprintk_mmu("KVM: %08x - %08x\n", pteg[14], pteg[15]);
228
229
230 /* Now tell our Shadow PTE code about the new page */
231
232 pte = kvmppc_mmu_hpte_cache_next(vcpu);
233 if (!pte) {
234 kvm_release_page_unused(page);
235 r = -EAGAIN;
236 goto out;
237 }
238
239 dprintk_mmu("KVM: %c%c Map 0x%llx: [%lx] 0x%llx (0x%llx) -> %lx\n",
240 orig_pte->may_write ? 'w' : '-',
241 orig_pte->may_execute ? 'x' : '-',
242 orig_pte->eaddr, (ulong)pteg, vpn,
243 orig_pte->vpage, hpaddr);
244
245 pte->slot = (ulong)&pteg[rr];
246 pte->host_vpn = vpn;
247 pte->pte = *orig_pte;
248 pte->pfn = hpaddr >> PAGE_SHIFT;
249
250 kvmppc_mmu_hpte_cache_map(vcpu, pte);
251
252 kvm_release_page_clean(page);
253out:
254 return r;
255}
256
257void kvmppc_mmu_unmap_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
258{
259 kvmppc_mmu_pte_vflush(vcpu, pte->vpage, 0xfffffffffULL);
260}
261
262static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
263{
264 struct kvmppc_sid_map *map;
265 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
266 u16 sid_map_mask;
267 static int backwards_map = 0;
268
269 if (kvmppc_get_msr(vcpu) & MSR_PR)
270 gvsid |= VSID_PR;
271
272 /* We might get collisions that trap in preceding order, so let's
273 map them differently */
274
275 sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
276 if (backwards_map)
277 sid_map_mask = SID_MAP_MASK - sid_map_mask;
278
279 map = &to_book3s(vcpu)->sid_map[sid_map_mask];
280
281 /* Make sure we're taking the other map next time */
282 backwards_map = !backwards_map;
283
284 /* Uh-oh ... out of mappings. Let's flush! */
285 if (vcpu_book3s->vsid_next >= VSID_POOL_SIZE) {
286 vcpu_book3s->vsid_next = 0;
287 memset(vcpu_book3s->sid_map, 0,
288 sizeof(struct kvmppc_sid_map) * SID_MAP_NUM);
289 kvmppc_mmu_pte_flush(vcpu, 0, 0);
290 kvmppc_mmu_flush_segments(vcpu);
291 }
292 map->host_vsid = vcpu_book3s->vsid_pool[vcpu_book3s->vsid_next];
293 vcpu_book3s->vsid_next++;
294
295 map->guest_vsid = gvsid;
296 map->valid = true;
297
298 return map;
299}
300
301int kvmppc_mmu_map_segment(struct kvm_vcpu *vcpu, ulong eaddr)
302{
303 u32 esid = eaddr >> SID_SHIFT;
304 u64 gvsid;
305 u32 sr;
306 struct kvmppc_sid_map *map;
307 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
308 int r = 0;
309
310 if (vcpu->arch.mmu.esid_to_vsid(vcpu, esid, &gvsid)) {
311 /* Invalidate an entry */
312 svcpu->sr[esid] = SR_INVALID;
313 r = -ENOENT;
314 goto out;
315 }
316
317 map = find_sid_vsid(vcpu, gvsid);
318 if (!map)
319 map = create_sid_map(vcpu, gvsid);
320
321 map->guest_esid = esid;
322 sr = map->host_vsid | SR_KP;
323 svcpu->sr[esid] = sr;
324
325 dprintk_sr("MMU: mtsr %d, 0x%x\n", esid, sr);
326
327out:
328 svcpu_put(svcpu);
329 return r;
330}
331
332void kvmppc_mmu_flush_segments(struct kvm_vcpu *vcpu)
333{
334 int i;
335 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
336
337 dprintk_sr("MMU: flushing all segments (%d)\n", ARRAY_SIZE(svcpu->sr));
338 for (i = 0; i < ARRAY_SIZE(svcpu->sr); i++)
339 svcpu->sr[i] = SR_INVALID;
340
341 svcpu_put(svcpu);
342}
343
344void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
345{
346 int i;
347
348 kvmppc_mmu_hpte_destroy(vcpu);
349 preempt_disable();
350 for (i = 0; i < SID_CONTEXTS; i++)
351 __destroy_context(to_book3s(vcpu)->context_id[i]);
352 preempt_enable();
353}
354
355int kvmppc_mmu_init_pr(struct kvm_vcpu *vcpu)
356{
357 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
358 int err;
359 ulong sdr1;
360 int i;
361 int j;
362
363 for (i = 0; i < SID_CONTEXTS; i++) {
364 err = __init_new_context();
365 if (err < 0)
366 goto init_fail;
367 vcpu3s->context_id[i] = err;
368
369 /* Remember context id for this combination */
370 for (j = 0; j < 16; j++)
371 vcpu3s->vsid_pool[(i * 16) + j] = CTX_TO_VSID(err, j);
372 }
373
374 vcpu3s->vsid_next = 0;
375
376 /* Remember where the HTAB is */
377 asm ( "mfsdr1 %0" : "=r"(sdr1) );
378 htabmask = ((sdr1 & 0x1FF) << 16) | 0xFFC0;
379 htab = (ulong)__va(sdr1 & 0xffff0000);
380
381 kvmppc_mmu_hpte_init(vcpu);
382
383 return 0;
384
385init_fail:
386 for (j = 0; j < i; j++) {
387 if (!vcpu3s->context_id[j])
388 continue;
389
390 __destroy_context(to_book3s(vcpu)->context_id[j]);
391 }
392
393 return -1;
394}
395

source code of linux/arch/powerpc/kvm/book3s_32_mmu_host.c