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3ae07890 AG |
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 2010 | |
16 | * | |
17 | * Authors: Alexander Graf <agraf@suse.de> | |
18 | */ | |
19 | ||
20 | #ifndef __ASM_KVM_BOOK3S_64_H__ | |
21 | #define __ASM_KVM_BOOK3S_64_H__ | |
22 | ||
de56a948 | 23 | #ifdef CONFIG_KVM_BOOK3S_PR |
468a12c2 | 24 | static inline struct kvmppc_book3s_shadow_vcpu *svcpu_get(struct kvm_vcpu *vcpu) |
3ae07890 | 25 | { |
468a12c2 | 26 | preempt_disable(); |
3ae07890 AG |
27 | return &get_paca()->shadow_vcpu; |
28 | } | |
468a12c2 AG |
29 | |
30 | static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu *svcpu) | |
31 | { | |
32 | preempt_enable(); | |
33 | } | |
de56a948 | 34 | #endif |
3ae07890 | 35 | |
54738c09 DG |
36 | #define SPAPR_TCE_SHIFT 12 |
37 | ||
8936dda4 | 38 | #ifdef CONFIG_KVM_BOOK3S_64_HV |
32fad281 PM |
39 | #define KVM_DEFAULT_HPT_ORDER 24 /* 16MB HPT by default */ |
40 | extern int kvm_hpt_order; /* order of preallocated HPTs */ | |
8936dda4 PM |
41 | #endif |
42 | ||
697d3899 PM |
43 | #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ |
44 | ||
075295dd PM |
45 | /* |
46 | * We use a lock bit in HPTE dword 0 to synchronize updates and | |
47 | * accesses to each HPTE, and another bit to indicate non-present | |
48 | * HPTEs. | |
49 | */ | |
50 | #define HPTE_V_HVLOCK 0x40UL | |
697d3899 | 51 | #define HPTE_V_ABSENT 0x20UL |
075295dd | 52 | |
44e5f6be PM |
53 | /* |
54 | * We use this bit in the guest_rpte field of the revmap entry | |
55 | * to indicate a modified HPTE. | |
56 | */ | |
57 | #define HPTE_GR_MODIFIED (1ul << 62) | |
58 | ||
59 | /* These bits are reserved in the guest view of the HPTE */ | |
60 | #define HPTE_GR_RESERVED HPTE_GR_MODIFIED | |
61 | ||
075295dd PM |
62 | static inline long try_lock_hpte(unsigned long *hpte, unsigned long bits) |
63 | { | |
64 | unsigned long tmp, old; | |
65 | ||
66 | asm volatile(" ldarx %0,0,%2\n" | |
67 | " and. %1,%0,%3\n" | |
68 | " bne 2f\n" | |
69 | " ori %0,%0,%4\n" | |
70 | " stdcx. %0,0,%2\n" | |
71 | " beq+ 2f\n" | |
8b5869ad | 72 | " mr %1,%3\n" |
075295dd PM |
73 | "2: isync" |
74 | : "=&r" (tmp), "=&r" (old) | |
75 | : "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK) | |
76 | : "cc", "memory"); | |
77 | return old == 0; | |
78 | } | |
79 | ||
36cc66d6 AS |
80 | static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r, |
81 | unsigned long pte_index) | |
82 | { | |
83 | unsigned long rb, va_low; | |
84 | ||
85 | rb = (v & ~0x7fUL) << 16; /* AVA field */ | |
86 | va_low = pte_index >> 3; | |
87 | if (v & HPTE_V_SECONDARY) | |
88 | va_low = ~va_low; | |
89 | /* xor vsid from AVA */ | |
90 | if (!(v & HPTE_V_1TB_SEG)) | |
91 | va_low ^= v >> 12; | |
92 | else | |
93 | va_low ^= v >> 24; | |
94 | va_low &= 0x7ff; | |
95 | if (v & HPTE_V_LARGE) { | |
96 | rb |= 1; /* L field */ | |
97 | if (cpu_has_feature(CPU_FTR_ARCH_206) && | |
98 | (r & 0xff000)) { | |
99 | /* non-16MB large page, must be 64k */ | |
100 | /* (masks depend on page size) */ | |
101 | rb |= 0x1000; /* page encoding in LP field */ | |
102 | rb |= (va_low & 0x7f) << 16; /* 7b of VA in AVA/LP field */ | |
103 | rb |= (va_low & 0xfe); /* AVAL field (P7 doesn't seem to care) */ | |
104 | } | |
105 | } else { | |
106 | /* 4kB page */ | |
107 | rb |= (va_low & 0x7ff) << 12; /* remaining 11b of VA */ | |
108 | } | |
109 | rb |= (v >> 54) & 0x300; /* B field */ | |
110 | return rb; | |
111 | } | |
112 | ||
c77162de PM |
113 | static inline unsigned long hpte_page_size(unsigned long h, unsigned long l) |
114 | { | |
115 | /* only handle 4k, 64k and 16M pages for now */ | |
116 | if (!(h & HPTE_V_LARGE)) | |
117 | return 1ul << 12; /* 4k page */ | |
118 | if ((l & 0xf000) == 0x1000 && cpu_has_feature(CPU_FTR_ARCH_206)) | |
119 | return 1ul << 16; /* 64k page */ | |
120 | if ((l & 0xff000) == 0) | |
121 | return 1ul << 24; /* 16M page */ | |
122 | return 0; /* error */ | |
123 | } | |
124 | ||
06ce2c63 PM |
125 | static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize) |
126 | { | |
127 | return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; | |
128 | } | |
129 | ||
4cf302bc PM |
130 | static inline int hpte_is_writable(unsigned long ptel) |
131 | { | |
132 | unsigned long pp = ptel & (HPTE_R_PP0 | HPTE_R_PP); | |
133 | ||
134 | return pp != PP_RXRX && pp != PP_RXXX; | |
135 | } | |
136 | ||
137 | static inline unsigned long hpte_make_readonly(unsigned long ptel) | |
138 | { | |
139 | if ((ptel & HPTE_R_PP0) || (ptel & HPTE_R_PP) == PP_RWXX) | |
140 | ptel = (ptel & ~HPTE_R_PP) | PP_RXXX; | |
141 | else | |
142 | ptel |= PP_RXRX; | |
143 | return ptel; | |
144 | } | |
145 | ||
9d0ef5ea PM |
146 | static inline int hpte_cache_flags_ok(unsigned long ptel, unsigned long io_type) |
147 | { | |
148 | unsigned int wimg = ptel & HPTE_R_WIMG; | |
149 | ||
150 | /* Handle SAO */ | |
151 | if (wimg == (HPTE_R_W | HPTE_R_I | HPTE_R_M) && | |
152 | cpu_has_feature(CPU_FTR_ARCH_206)) | |
153 | wimg = HPTE_R_M; | |
154 | ||
155 | if (!io_type) | |
156 | return wimg == HPTE_R_M; | |
157 | ||
158 | return (wimg & (HPTE_R_W | HPTE_R_I)) == io_type; | |
159 | } | |
160 | ||
342d3db7 PM |
161 | /* |
162 | * Lock and read a linux PTE. If it's present and writable, atomically | |
163 | * set dirty and referenced bits and return the PTE, otherwise return 0. | |
164 | */ | |
4cf302bc | 165 | static inline pte_t kvmppc_read_update_linux_pte(pte_t *p, int writing) |
342d3db7 PM |
166 | { |
167 | pte_t pte, tmp; | |
168 | ||
169 | /* wait until _PAGE_BUSY is clear then set it atomically */ | |
170 | __asm__ __volatile__ ( | |
171 | "1: ldarx %0,0,%3\n" | |
172 | " andi. %1,%0,%4\n" | |
173 | " bne- 1b\n" | |
174 | " ori %1,%0,%4\n" | |
175 | " stdcx. %1,0,%3\n" | |
176 | " bne- 1b" | |
177 | : "=&r" (pte), "=&r" (tmp), "=m" (*p) | |
178 | : "r" (p), "i" (_PAGE_BUSY) | |
179 | : "cc"); | |
180 | ||
181 | if (pte_present(pte)) { | |
182 | pte = pte_mkyoung(pte); | |
4cf302bc | 183 | if (writing && pte_write(pte)) |
342d3db7 PM |
184 | pte = pte_mkdirty(pte); |
185 | } | |
186 | ||
187 | *p = pte; /* clears _PAGE_BUSY */ | |
188 | ||
189 | return pte; | |
190 | } | |
191 | ||
9d0ef5ea PM |
192 | /* Return HPTE cache control bits corresponding to Linux pte bits */ |
193 | static inline unsigned long hpte_cache_bits(unsigned long pte_val) | |
194 | { | |
195 | #if _PAGE_NO_CACHE == HPTE_R_I && _PAGE_WRITETHRU == HPTE_R_W | |
196 | return pte_val & (HPTE_R_W | HPTE_R_I); | |
197 | #else | |
198 | return ((pte_val & _PAGE_NO_CACHE) ? HPTE_R_I : 0) + | |
199 | ((pte_val & _PAGE_WRITETHRU) ? HPTE_R_W : 0); | |
200 | #endif | |
201 | } | |
202 | ||
697d3899 PM |
203 | static inline bool hpte_read_permission(unsigned long pp, unsigned long key) |
204 | { | |
205 | if (key) | |
206 | return PP_RWRX <= pp && pp <= PP_RXRX; | |
207 | return 1; | |
208 | } | |
209 | ||
210 | static inline bool hpte_write_permission(unsigned long pp, unsigned long key) | |
211 | { | |
212 | if (key) | |
213 | return pp == PP_RWRW; | |
214 | return pp <= PP_RWRW; | |
215 | } | |
216 | ||
217 | static inline int hpte_get_skey_perm(unsigned long hpte_r, unsigned long amr) | |
218 | { | |
219 | unsigned long skey; | |
220 | ||
221 | skey = ((hpte_r & HPTE_R_KEY_HI) >> 57) | | |
222 | ((hpte_r & HPTE_R_KEY_LO) >> 9); | |
223 | return (amr >> (62 - 2 * skey)) & 3; | |
224 | } | |
225 | ||
06ce2c63 PM |
226 | static inline void lock_rmap(unsigned long *rmap) |
227 | { | |
228 | do { | |
229 | while (test_bit(KVMPPC_RMAP_LOCK_BIT, rmap)) | |
230 | cpu_relax(); | |
231 | } while (test_and_set_bit_lock(KVMPPC_RMAP_LOCK_BIT, rmap)); | |
232 | } | |
233 | ||
234 | static inline void unlock_rmap(unsigned long *rmap) | |
235 | { | |
236 | __clear_bit_unlock(KVMPPC_RMAP_LOCK_BIT, rmap); | |
237 | } | |
238 | ||
da9d1d7f PM |
239 | static inline bool slot_is_aligned(struct kvm_memory_slot *memslot, |
240 | unsigned long pagesize) | |
241 | { | |
242 | unsigned long mask = (pagesize >> PAGE_SHIFT) - 1; | |
243 | ||
244 | if (pagesize <= PAGE_SIZE) | |
245 | return 1; | |
246 | return !(memslot->base_gfn & mask) && !(memslot->npages & mask); | |
247 | } | |
248 | ||
a2932923 PM |
249 | /* |
250 | * This works for 4k, 64k and 16M pages on POWER7, | |
251 | * and 4k and 16M pages on PPC970. | |
252 | */ | |
253 | static inline unsigned long slb_pgsize_encoding(unsigned long psize) | |
254 | { | |
255 | unsigned long senc = 0; | |
256 | ||
257 | if (psize > 0x1000) { | |
258 | senc = SLB_VSID_L; | |
259 | if (psize == 0x10000) | |
260 | senc |= SLB_VSID_LP_01; | |
261 | } | |
262 | return senc; | |
263 | } | |
264 | ||
265 | static inline int is_vrma_hpte(unsigned long hpte_v) | |
266 | { | |
267 | return (hpte_v & ~0xffffffUL) == | |
268 | (HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16))); | |
269 | } | |
270 | ||
a1b4a0f6 PM |
271 | #ifdef CONFIG_KVM_BOOK3S_64_HV |
272 | /* | |
273 | * Note modification of an HPTE; set the HPTE modified bit | |
274 | * if anyone is interested. | |
275 | */ | |
276 | static inline void note_hpte_modification(struct kvm *kvm, | |
277 | struct revmap_entry *rev) | |
278 | { | |
279 | if (atomic_read(&kvm->arch.hpte_mod_interest)) | |
280 | rev->guest_rpte |= HPTE_GR_MODIFIED; | |
281 | } | |
282 | #endif /* CONFIG_KVM_BOOK3S_64_HV */ | |
283 | ||
3ae07890 | 284 | #endif /* __ASM_KVM_BOOK3S_64_H__ */ |