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-rw-r--r--include/asm-x86/xen/page.h168
-rw-r--r--include/xen/page.h169
2 files changed, 169 insertions, 168 deletions
diff --git a/include/asm-x86/xen/page.h b/include/asm-x86/xen/page.h
new file mode 100644
index 000000000000..01799305f02a
--- /dev/null
+++ b/include/asm-x86/xen/page.h
@@ -0,0 +1,168 @@
1#ifndef __XEN_PAGE_H
2#define __XEN_PAGE_H
3
4#include <linux/pfn.h>
5
6#include <asm/uaccess.h>
7#include <asm/pgtable.h>
8
9#include <xen/features.h>
10
11/* Xen machine address */
12typedef struct xmaddr {
13 phys_addr_t maddr;
14} xmaddr_t;
15
16/* Xen pseudo-physical address */
17typedef struct xpaddr {
18 phys_addr_t paddr;
19} xpaddr_t;
20
21#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
22#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
23
24/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
25#define INVALID_P2M_ENTRY (~0UL)
26#define FOREIGN_FRAME_BIT (1UL<<31)
27#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
28
29extern unsigned long *phys_to_machine_mapping;
30
31static inline unsigned long pfn_to_mfn(unsigned long pfn)
32{
33 if (xen_feature(XENFEAT_auto_translated_physmap))
34 return pfn;
35
36 return phys_to_machine_mapping[(unsigned int)(pfn)] &
37 ~FOREIGN_FRAME_BIT;
38}
39
40static inline int phys_to_machine_mapping_valid(unsigned long pfn)
41{
42 if (xen_feature(XENFEAT_auto_translated_physmap))
43 return 1;
44
45 return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY);
46}
47
48static inline unsigned long mfn_to_pfn(unsigned long mfn)
49{
50 unsigned long pfn;
51
52 if (xen_feature(XENFEAT_auto_translated_physmap))
53 return mfn;
54
55#if 0
56 if (unlikely((mfn >> machine_to_phys_order) != 0))
57 return max_mapnr;
58#endif
59
60 pfn = 0;
61 /*
62 * The array access can fail (e.g., device space beyond end of RAM).
63 * In such cases it doesn't matter what we return (we return garbage),
64 * but we must handle the fault without crashing!
65 */
66 __get_user(pfn, &machine_to_phys_mapping[mfn]);
67
68 return pfn;
69}
70
71static inline xmaddr_t phys_to_machine(xpaddr_t phys)
72{
73 unsigned offset = phys.paddr & ~PAGE_MASK;
74 return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
75}
76
77static inline xpaddr_t machine_to_phys(xmaddr_t machine)
78{
79 unsigned offset = machine.maddr & ~PAGE_MASK;
80 return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
81}
82
83/*
84 * We detect special mappings in one of two ways:
85 * 1. If the MFN is an I/O page then Xen will set the m2p entry
86 * to be outside our maximum possible pseudophys range.
87 * 2. If the MFN belongs to a different domain then we will certainly
88 * not have MFN in our p2m table. Conversely, if the page is ours,
89 * then we'll have p2m(m2p(MFN))==MFN.
90 * If we detect a special mapping then it doesn't have a 'struct page'.
91 * We force !pfn_valid() by returning an out-of-range pointer.
92 *
93 * NB. These checks require that, for any MFN that is not in our reservation,
94 * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
95 * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
96 * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
97 *
98 * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
99 * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
100 * require. In all the cases we care about, the FOREIGN_FRAME bit is
101 * masked (e.g., pfn_to_mfn()) so behaviour there is correct.
102 */
103static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
104{
105 extern unsigned long max_mapnr;
106 unsigned long pfn = mfn_to_pfn(mfn);
107 if ((pfn < max_mapnr)
108 && !xen_feature(XENFEAT_auto_translated_physmap)
109 && (phys_to_machine_mapping[pfn] != mfn))
110 return max_mapnr; /* force !pfn_valid() */
111 return pfn;
112}
113
114static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
115{
116 if (xen_feature(XENFEAT_auto_translated_physmap)) {
117 BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
118 return;
119 }
120 phys_to_machine_mapping[pfn] = mfn;
121}
122
123/* VIRT <-> MACHINE conversion */
124#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
125#define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v))))
126#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
127
128static inline unsigned long pte_mfn(pte_t pte)
129{
130 return (pte.pte & ~_PAGE_NX) >> PAGE_SHIFT;
131}
132
133static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
134{
135 pte_t pte;
136
137 pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
138 (pgprot_val(pgprot) & __supported_pte_mask);
139
140 return pte;
141}
142
143static inline pteval_t pte_val_ma(pte_t pte)
144{
145 return pte.pte;
146}
147
148static inline pte_t __pte_ma(pteval_t x)
149{
150 return (pte_t) { .pte = x };
151}
152
153#ifdef CONFIG_X86_PAE
154#define pmd_val_ma(v) ((v).pmd)
155#define pud_val_ma(v) ((v).pgd.pgd)
156#define __pmd_ma(x) ((pmd_t) { (x) } )
157#else /* !X86_PAE */
158#define pmd_val_ma(v) ((v).pud.pgd.pgd)
159#endif /* CONFIG_X86_PAE */
160
161#define pgd_val_ma(x) ((x).pgd)
162
163
164xmaddr_t arbitrary_virt_to_machine(unsigned long address);
165void make_lowmem_page_readonly(void *vaddr);
166void make_lowmem_page_readwrite(void *vaddr);
167
168#endif /* __XEN_PAGE_H */
diff --git a/include/xen/page.h b/include/xen/page.h
index 01799305f02a..eaf85fab1263 100644
--- a/include/xen/page.h
+++ b/include/xen/page.h
@@ -1,168 +1 @@
1#ifndef __XEN_PAGE_H #include <asm/xen/page.h>
2#define __XEN_PAGE_H
3
4#include <linux/pfn.h>
5
6#include <asm/uaccess.h>
7#include <asm/pgtable.h>
8
9#include <xen/features.h>
10
11/* Xen machine address */
12typedef struct xmaddr {
13 phys_addr_t maddr;
14} xmaddr_t;
15
16/* Xen pseudo-physical address */
17typedef struct xpaddr {
18 phys_addr_t paddr;
19} xpaddr_t;
20
21#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
22#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
23
24/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
25#define INVALID_P2M_ENTRY (~0UL)
26#define FOREIGN_FRAME_BIT (1UL<<31)
27#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
28
29extern unsigned long *phys_to_machine_mapping;
30
31static inline unsigned long pfn_to_mfn(unsigned long pfn)
32{
33 if (xen_feature(XENFEAT_auto_translated_physmap))
34 return pfn;
35
36 return phys_to_machine_mapping[(unsigned int)(pfn)] &
37 ~FOREIGN_FRAME_BIT;
38}
39
40static inline int phys_to_machine_mapping_valid(unsigned long pfn)
41{
42 if (xen_feature(XENFEAT_auto_translated_physmap))
43 return 1;
44
45 return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY);
46}
47
48static inline unsigned long mfn_to_pfn(unsigned long mfn)
49{
50 unsigned long pfn;
51
52 if (xen_feature(XENFEAT_auto_translated_physmap))
53 return mfn;
54
55#if 0
56 if (unlikely((mfn >> machine_to_phys_order) != 0))
57 return max_mapnr;
58#endif
59
60 pfn = 0;
61 /*
62 * The array access can fail (e.g., device space beyond end of RAM).
63 * In such cases it doesn't matter what we return (we return garbage),
64 * but we must handle the fault without crashing!
65 */
66 __get_user(pfn, &machine_to_phys_mapping[mfn]);
67
68 return pfn;
69}
70
71static inline xmaddr_t phys_to_machine(xpaddr_t phys)
72{
73 unsigned offset = phys.paddr & ~PAGE_MASK;
74 return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
75}
76
77static inline xpaddr_t machine_to_phys(xmaddr_t machine)
78{
79 unsigned offset = machine.maddr & ~PAGE_MASK;
80 return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
81}
82
83/*
84 * We detect special mappings in one of two ways:
85 * 1. If the MFN is an I/O page then Xen will set the m2p entry
86 * to be outside our maximum possible pseudophys range.
87 * 2. If the MFN belongs to a different domain then we will certainly
88 * not have MFN in our p2m table. Conversely, if the page is ours,
89 * then we'll have p2m(m2p(MFN))==MFN.
90 * If we detect a special mapping then it doesn't have a 'struct page'.
91 * We force !pfn_valid() by returning an out-of-range pointer.
92 *
93 * NB. These checks require that, for any MFN that is not in our reservation,
94 * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
95 * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
96 * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
97 *
98 * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
99 * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
100 * require. In all the cases we care about, the FOREIGN_FRAME bit is
101 * masked (e.g., pfn_to_mfn()) so behaviour there is correct.
102 */
103static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
104{
105 extern unsigned long max_mapnr;
106 unsigned long pfn = mfn_to_pfn(mfn);
107 if ((pfn < max_mapnr)
108 && !xen_feature(XENFEAT_auto_translated_physmap)
109 && (phys_to_machine_mapping[pfn] != mfn))
110 return max_mapnr; /* force !pfn_valid() */
111 return pfn;
112}
113
114static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
115{
116 if (xen_feature(XENFEAT_auto_translated_physmap)) {
117 BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
118 return;
119 }
120 phys_to_machine_mapping[pfn] = mfn;
121}
122
123/* VIRT <-> MACHINE conversion */
124#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
125#define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v))))
126#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
127
128static inline unsigned long pte_mfn(pte_t pte)
129{
130 return (pte.pte & ~_PAGE_NX) >> PAGE_SHIFT;
131}
132
133static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
134{
135 pte_t pte;
136
137 pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
138 (pgprot_val(pgprot) & __supported_pte_mask);
139
140 return pte;
141}
142
143static inline pteval_t pte_val_ma(pte_t pte)
144{
145 return pte.pte;
146}
147
148static inline pte_t __pte_ma(pteval_t x)
149{
150 return (pte_t) { .pte = x };
151}
152
153#ifdef CONFIG_X86_PAE
154#define pmd_val_ma(v) ((v).pmd)
155#define pud_val_ma(v) ((v).pgd.pgd)
156#define __pmd_ma(x) ((pmd_t) { (x) } )
157#else /* !X86_PAE */
158#define pmd_val_ma(v) ((v).pud.pgd.pgd)
159#endif /* CONFIG_X86_PAE */
160
161#define pgd_val_ma(x) ((x).pgd)
162
163
164xmaddr_t arbitrary_virt_to_machine(unsigned long address);
165void make_lowmem_page_readonly(void *vaddr);
166void make_lowmem_page_readwrite(void *vaddr);
167
168#endif /* __XEN_PAGE_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 07:05:38 -0500