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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> |
20e71f2e IY |
15 | #include <xen/features.h> |
16 | ||
17 | /* Xen machine address */ | |
18 | typedef struct xmaddr { | |
19 | phys_addr_t maddr; | |
20 | } xmaddr_t; | |
21 | ||
22 | /* Xen pseudo-physical address */ | |
23 | typedef struct xpaddr { | |
24 | phys_addr_t paddr; | |
25 | } xpaddr_t; | |
26 | ||
27 | #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) | |
28 | #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) | |
29 | ||
30 | /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/ | |
31 | #define INVALID_P2M_ENTRY (~0UL) | |
f4cec35b KRW |
32 | #define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1)) |
33 | #define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2)) | |
20e71f2e | 34 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) |
f4cec35b | 35 | #define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT) |
20e71f2e | 36 | |
8006ec3e JF |
37 | /* Maximum amount of memory we can handle in a domain in pages */ |
38 | #define MAX_DOMAIN_PAGES \ | |
39 | ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE)) | |
40 | ||
7e77506a IC |
41 | extern unsigned long *machine_to_phys_mapping; |
42 | extern unsigned int machine_to_phys_order; | |
8006ec3e | 43 | |
d451bb7a | 44 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
c3798062 | 45 | extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
6eaa412f | 46 | extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
f4cec35b KRW |
47 | extern unsigned long set_phys_range_identity(unsigned long pfn_s, |
48 | unsigned long pfn_e); | |
20e71f2e | 49 | |
87f1d40a JF |
50 | extern int m2p_add_override(unsigned long mfn, struct page *page); |
51 | extern int m2p_remove_override(struct page *page); | |
448f2831 JF |
52 | extern struct page *m2p_find_override(unsigned long mfn); |
53 | extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn); | |
54 | ||
2222e71b KRW |
55 | #ifdef CONFIG_XEN_DEBUG_FS |
56 | extern int p2m_dump_show(struct seq_file *m, void *v); | |
57 | #endif | |
20e71f2e IY |
58 | static inline unsigned long pfn_to_mfn(unsigned long pfn) |
59 | { | |
cfd8951e JF |
60 | unsigned long mfn; |
61 | ||
20e71f2e IY |
62 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
63 | return pfn; | |
64 | ||
cfd8951e JF |
65 | mfn = get_phys_to_machine(pfn); |
66 | ||
67 | if (mfn != INVALID_P2M_ENTRY) | |
f4cec35b | 68 | mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT); |
cfd8951e JF |
69 | |
70 | return mfn; | |
20e71f2e IY |
71 | } |
72 | ||
73 | static inline int phys_to_machine_mapping_valid(unsigned long pfn) | |
74 | { | |
75 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
76 | return 1; | |
77 | ||
d451bb7a | 78 | return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY; |
20e71f2e IY |
79 | } |
80 | ||
81 | static inline unsigned long mfn_to_pfn(unsigned long mfn) | |
82 | { | |
83 | unsigned long pfn; | |
706cc9d2 | 84 | int ret = 0; |
20e71f2e IY |
85 | |
86 | if (xen_feature(XENFEAT_auto_translated_physmap)) | |
87 | return mfn; | |
88 | ||
146c4e51 KRW |
89 | if (unlikely((mfn >> machine_to_phys_order) != 0)) { |
90 | pfn = ~0; | |
91 | goto try_override; | |
92 | } | |
20e71f2e IY |
93 | pfn = 0; |
94 | /* | |
95 | * The array access can fail (e.g., device space beyond end of RAM). | |
96 | * In such cases it doesn't matter what we return (we return garbage), | |
97 | * but we must handle the fault without crashing! | |
98 | */ | |
706cc9d2 | 99 | ret = __get_user(pfn, &machine_to_phys_mapping[mfn]); |
146c4e51 | 100 | try_override: |
706cc9d2 SS |
101 | /* ret might be < 0 if there are no entries in the m2p for mfn */ |
102 | if (ret < 0) | |
103 | pfn = ~0; | |
104 | else if (get_phys_to_machine(pfn) != mfn) | |
105 | /* | |
106 | * If this appears to be a foreign mfn (because the pfn | |
107 | * doesn't map back to the mfn), then check the local override | |
108 | * table to see if there's a better pfn to use. | |
109 | * | |
110 | * m2p_find_override_pfn returns ~0 if it doesn't find anything. | |
111 | */ | |
112 | pfn = m2p_find_override_pfn(mfn, ~0); | |
113 | ||
114 | /* | |
115 | * pfn is ~0 if there are no entries in the m2p for mfn or if the | |
116 | * entry doesn't map back to the mfn and m2p_override doesn't have a | |
117 | * valid entry for it. | |
448f2831 | 118 | */ |
706cc9d2 SS |
119 | if (pfn == ~0 && |
120 | get_phys_to_machine(mfn) == IDENTITY_FRAME(mfn)) | |
121 | pfn = mfn; | |
448f2831 | 122 | |
20e71f2e IY |
123 | return pfn; |
124 | } | |
125 | ||
126 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) | |
127 | { | |
128 | unsigned offset = phys.paddr & ~PAGE_MASK; | |
947d0496 | 129 | return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
20e71f2e IY |
130 | } |
131 | ||
132 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) | |
133 | { | |
134 | unsigned offset = machine.maddr & ~PAGE_MASK; | |
947d0496 | 135 | return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
20e71f2e IY |
136 | } |
137 | ||
138 | /* | |
139 | * We detect special mappings in one of two ways: | |
140 | * 1. If the MFN is an I/O page then Xen will set the m2p entry | |
141 | * to be outside our maximum possible pseudophys range. | |
142 | * 2. If the MFN belongs to a different domain then we will certainly | |
143 | * not have MFN in our p2m table. Conversely, if the page is ours, | |
144 | * then we'll have p2m(m2p(MFN))==MFN. | |
145 | * If we detect a special mapping then it doesn't have a 'struct page'. | |
146 | * We force !pfn_valid() by returning an out-of-range pointer. | |
147 | * | |
148 | * NB. These checks require that, for any MFN that is not in our reservation, | |
149 | * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if | |
150 | * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN. | |
151 | * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety. | |
152 | * | |
153 | * NB2. When deliberately mapping foreign pages into the p2m table, you *must* | |
154 | * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we | |
155 | * require. In all the cases we care about, the FOREIGN_FRAME bit is | |
156 | * masked (e.g., pfn_to_mfn()) so behaviour there is correct. | |
157 | */ | |
158 | static inline unsigned long mfn_to_local_pfn(unsigned long mfn) | |
159 | { | |
20e71f2e | 160 | unsigned long pfn = mfn_to_pfn(mfn); |
c0011dbf JF |
161 | if (get_phys_to_machine(pfn) != mfn) |
162 | return -1; /* force !pfn_valid() */ | |
20e71f2e IY |
163 | return pfn; |
164 | } | |
165 | ||
20e71f2e IY |
166 | /* VIRT <-> MACHINE conversion */ |
167 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) | |
b40bf53e AN |
168 | #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) |
169 | #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) | |
20e71f2e IY |
170 | #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) |
171 | ||
172 | static inline unsigned long pte_mfn(pte_t pte) | |
173 | { | |
59438c9f | 174 | return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
20e71f2e IY |
175 | } |
176 | ||
177 | static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
178 | { | |
179 | pte_t pte; | |
180 | ||
181 | pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) | | |
b534816b | 182 | massage_pgprot(pgprot); |
20e71f2e IY |
183 | |
184 | return pte; | |
185 | } | |
186 | ||
187 | static inline pteval_t pte_val_ma(pte_t pte) | |
188 | { | |
189 | return pte.pte; | |
190 | } | |
191 | ||
192 | static inline pte_t __pte_ma(pteval_t x) | |
193 | { | |
194 | return (pte_t) { .pte = x }; | |
195 | } | |
196 | ||
20e71f2e | 197 | #define pmd_val_ma(v) ((v).pmd) |
f6e58732 | 198 | #ifdef __PAGETABLE_PUD_FOLDED |
20e71f2e | 199 | #define pud_val_ma(v) ((v).pgd.pgd) |
f6e58732 JF |
200 | #else |
201 | #define pud_val_ma(v) ((v).pud) | |
202 | #endif | |
20e71f2e | 203 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
20e71f2e IY |
204 | |
205 | #define pgd_val_ma(x) ((x).pgd) | |
206 | ||
eba3ff8b | 207 | void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid); |
20e71f2e | 208 | |
ce803e70 | 209 | xmaddr_t arbitrary_virt_to_machine(void *address); |
9976b39b | 210 | unsigned long arbitrary_virt_to_mfn(void *vaddr); |
20e71f2e IY |
211 | void make_lowmem_page_readonly(void *vaddr); |
212 | void make_lowmem_page_readwrite(void *vaddr); | |
213 | ||
05e4d316 | 214 | #endif /* _ASM_X86_XEN_PAGE_H */ |