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05e4d316 PA |
1 | #ifndef _ASM_X86_XEN_PAGE_H |
2 | #define _ASM_X86_XEN_PAGE_H | |
20e71f2e | 3 | |
ecbf29cd JF |
4 | #include <linux/kernel.h> |
5 | #include <linux/types.h> | |
6 | #include <linux/spinlock.h> | |
20e71f2e | 7 | #include <linux/pfn.h> |
7e77506a | 8 | #include <linux/mm.h> |
20e71f2e IY |
9 | |
10 | #include <asm/uaccess.h> | |
ecbf29cd | 11 | #include <asm/page.h> |
20e71f2e IY |
12 | #include <asm/pgtable.h> |
13 | ||
ecbf29cd | 14 | #include <xen/interface/xen.h> |
0930bba6 | 15 | #include <xen/grant_table.h> |
20e71f2e IY |
16 | #include <xen/features.h> |
17 | ||
18 | /* Xen machine address */ | |
19 | typedef struct xmaddr { | |
20 | phys_addr_t maddr; | |
21 | } xmaddr_t; | |
22 | ||
23 | /* Xen pseudo-physical address */ | |
24 | typedef struct xpaddr { | |
25 | phys_addr_t paddr; | |
26 | } xpaddr_t; | |
27 | ||
28 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
29 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
30 | ||
31 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
32 | #define INVALID_P2M_ENTRY (~0UL) | |
f4cec35b KRW |
33 | #define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1)) |
34 | #define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2)) | |
20e71f2e | 35 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) |
f4cec35b | 36 | #define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT) |
20e71f2e | 37 | |
8006ec3e JF |
38 | /* Maximum amount of memory we can handle in a domain in pages */ |
39 | #define MAX_DOMAIN_PAGES \ | |
40 | ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE)) | |
41 | ||
7e77506a | 42 | extern unsigned long *machine_to_phys_mapping; |
ccbcdf7c | 43 | extern unsigned long machine_to_phys_nr; |
8006ec3e | 44 | |
d451bb7a | 45 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
c3798062 | 46 | extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
940713bb | 47 | extern bool __init early_set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
6eaa412f | 48 | extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
f4cec35b KRW |
49 | extern unsigned long set_phys_range_identity(unsigned long pfn_s, |
50 | unsigned long pfn_e); | |
20e71f2e | 51 | |
cf8d9163 | 52 | extern int m2p_add_override(unsigned long mfn, struct page *page, |
0930bba6 | 53 | struct gnttab_map_grant_ref *kmap_op); |
2fc136ee | 54 | extern int m2p_remove_override(struct page *page, |
e85fc980 | 55 | struct gnttab_map_grant_ref *kmap_op); |
448f2831 JF |
56 | extern struct page *m2p_find_override(unsigned long mfn); |
57 | extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn); | |
58 | ||
20e71f2e IY |
59 | static inline unsigned long pfn_to_mfn(unsigned long pfn) |
60 | { | |
cfd8951e JF |
61 | unsigned long mfn; |
62 | ||
20e71f2e IY |
63 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
64 | return pfn; | |
65 | ||
cfd8951e JF |
66 | mfn = get_phys_to_machine(pfn); |
67 | ||
68 | if (mfn != INVALID_P2M_ENTRY) | |
f4cec35b | 69 | mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT); |
cfd8951e JF |
70 | |
71 | return mfn; | |
20e71f2e IY |
72 | } |
73 | ||
74 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
75 | { | |
76 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
77 | return 1; | |
78 | ||
d451bb7a | 79 | return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY; |
20e71f2e IY |
80 | } |
81 | ||
0160676b | 82 | static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn) |
20e71f2e IY |
83 | { |
84 | unsigned long pfn; | |
0160676b | 85 | int ret; |
20e71f2e IY |
86 | |
87 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
88 | return mfn; | |
89 | ||
0160676b DV |
90 | if (unlikely(mfn >= machine_to_phys_nr)) |
91 | return ~0; | |
92 | ||
20e71f2e IY |
93 | /* |
94 | * The array access can fail (e.g., device space beyond end of RAM). | |
95 | * In such cases it doesn't matter what we return (we return garbage), | |
96 | * but we must handle the fault without crashing! | |
97 | */ | |
706cc9d2 | 98 | ret = __get_user(pfn, &machine_to_phys_mapping[mfn]); |
706cc9d2 | 99 | if (ret < 0) |
0160676b DV |
100 | return ~0; |
101 | ||
102 | return pfn; | |
103 | } | |
104 | ||
105 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
106 | { | |
107 | unsigned long pfn; | |
108 | ||
109 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
110 | return mfn; | |
111 | ||
112 | pfn = mfn_to_pfn_no_overrides(mfn); | |
113 | if (get_phys_to_machine(pfn) != mfn) { | |
706cc9d2 SS |
114 | /* |
115 | * If this appears to be a foreign mfn (because the pfn | |
116 | * doesn't map back to the mfn), then check the local override | |
117 | * table to see if there's a better pfn to use. | |
118 | * | |
119 | * m2p_find_override_pfn returns ~0 if it doesn't find anything. | |
120 | */ | |
121 | pfn = m2p_find_override_pfn(mfn, ~0); | |
0160676b | 122 | } |
706cc9d2 | 123 | |
e85fc980 | 124 | /* |
706cc9d2 SS |
125 | * pfn is ~0 if there are no entries in the m2p for mfn or if the |
126 | * entry doesn't map back to the mfn and m2p_override doesn't have a | |
127 | * valid entry for it. | |
448f2831 | 128 | */ |
706cc9d2 SS |
129 | if (pfn == ~0 && |
130 | get_phys_to_machine(mfn) == IDENTITY_FRAME(mfn)) | |
131 | pfn = mfn; | |
448f2831 | 132 | |
20e71f2e IY |
133 | return pfn; |
134 | } | |
135 | ||
136 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
137 | { | |
138 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
947d0496 | 139 | return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
20e71f2e IY |
140 | } |
141 | ||
142 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
143 | { | |
144 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
947d0496 | 145 | return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
20e71f2e IY |
146 | } |
147 | ||
148 | /* | |
149 | * We detect special mappings in one of two ways: | |
150 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
151 | * to be outside our maximum possible pseudophys range. | |
152 | * 2. If the MFN belongs to a different domain then we will certainly | |
153 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
154 | * then we'll have p2m(m2p(MFN))==MFN. | |
155 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
156 | * We force !pfn_valid() by returning an out-of-range pointer. | |
157 | * | |
158 | * NB. These checks require that, for any MFN that is not in our reservation, | |
159 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
160 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
161 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
162 | * | |
163 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
164 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
165 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
166 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
167 | */ | |
168 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
169 | { | |
fc590efe MR |
170 | unsigned long pfn; |
171 | ||
172 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
173 | return mfn; | |
174 | ||
175 | pfn = mfn_to_pfn(mfn); | |
c0011dbf JF |
176 | if (get_phys_to_machine(pfn) != mfn) |
177 | return -1; /* force !pfn_valid() */ | |
20e71f2e IY |
178 | return pfn; |
179 | } | |
180 | ||
20e71f2e IY |
181 | /* VIRT <-> MACHINE conversion */ |
182 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
b40bf53e AN |
183 | #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) |
184 | #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) | |
20e71f2e IY |
185 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) |
186 | ||
187 | static inline unsigned long pte_mfn(pte_t pte) | |
188 | { | |
59438c9f | 189 | return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
20e71f2e IY |
190 | } |
191 | ||
192 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
193 | { | |
194 | pte_t pte; | |
195 | ||
196 | pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | |
b534816b | 197 | massage_pgprot(pgprot); |
20e71f2e IY |
198 | |
199 | return pte; | |
200 | } | |
201 | ||
202 | static inline pteval_t pte_val_ma(pte_t pte) | |
203 | { | |
204 | return pte.pte; | |
205 | } | |
206 | ||
207 | static inline pte_t __pte_ma(pteval_t x) | |
208 | { | |
209 | return (pte_t) { .pte = x }; | |
210 | } | |
211 | ||
20e71f2e | 212 | #define pmd_val_ma(v) ((v).pmd) |
f6e58732 | 213 | #ifdef __PAGETABLE_PUD_FOLDED |
20e71f2e | 214 | #define pud_val_ma(v) ((v).pgd.pgd) |
f6e58732 JF |
215 | #else |
216 | #define pud_val_ma(v) ((v).pud) | |
217 | #endif | |
20e71f2e | 218 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
20e71f2e IY |
219 | |
220 | #define pgd_val_ma(x) ((x).pgd) | |
221 | ||
eba3ff8b | 222 | void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid); |
20e71f2e | 223 | |
ce803e70 | 224 | xmaddr_t arbitrary_virt_to_machine(void *address); |
9976b39b | 225 | unsigned long arbitrary_virt_to_mfn(void *vaddr); |
20e71f2e IY |
226 | void make_lowmem_page_readonly(void *vaddr); |
227 | void make_lowmem_page_readwrite(void *vaddr); | |
228 | ||
3216dceb | 229 | #define xen_remap(cookie, size) ioremap((cookie), (size)); |
efaf30a3 | 230 | #define xen_unmap(cookie) iounmap((cookie)) |
3216dceb | 231 | |
05e4d316 | 232 | #endif /* _ASM_X86_XEN_PAGE_H */ |