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H. Peter Anvin05e4d312008-10-23 00:01:39 -07001#ifndef _ASM_X86_XEN_PAGE_H
2#define _ASM_X86_XEN_PAGE_H
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -07003
Jeremy Fitzhardingeecbf29c2008-12-16 12:37:07 -08004#include <linux/kernel.h>
5#include <linux/types.h>
6#include <linux/spinlock.h>
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -07007#include <linux/pfn.h>
Ian Campbell7e775062010-09-30 12:37:26 +01008#include <linux/mm.h>
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -07009
10#include <asm/uaccess.h>
Jeremy Fitzhardingeecbf29c2008-12-16 12:37:07 -080011#include <asm/page.h>
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070012#include <asm/pgtable.h>
13
Jeremy Fitzhardingeecbf29c2008-12-16 12:37:07 -080014#include <xen/interface/xen.h>
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070015#include <xen/features.h>
16
17/* Xen machine address */
18typedef struct xmaddr {
19 phys_addr_t maddr;
20} xmaddr_t;
21
22/* Xen pseudo-physical address */
23typedef 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)
32#define FOREIGN_FRAME_BIT (1UL<<31)
33#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
34
Jeremy Fitzhardinge8006ec32008-05-26 23:31:19 +010035/* Maximum amount of memory we can handle in a domain in pages */
36#define MAX_DOMAIN_PAGES \
37 ((unsigned long)((u64)CONFIG_XEN_MAX_DOMAIN_MEMORY * 1024 * 1024 * 1024 / PAGE_SIZE))
38
Ian Campbell7e775062010-09-30 12:37:26 +010039extern unsigned long *machine_to_phys_mapping;
40extern unsigned int machine_to_phys_order;
Jeremy Fitzhardinge8006ec32008-05-26 23:31:19 +010041
Jeremy Fitzhardinged451bb72008-05-26 23:31:18 +010042extern unsigned long get_phys_to_machine(unsigned long pfn);
Jeremy Fitzhardingec3798062010-08-27 13:42:04 -070043extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
Konrad Rzeszutek Wilk6eaa4122011-01-18 20:09:41 -050044extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070045
Jeremy Fitzhardinge87f1d402010-12-13 14:42:30 +000046extern int m2p_add_override(unsigned long mfn, struct page *page);
47extern int m2p_remove_override(struct page *page);
Jeremy Fitzhardinge448f28312010-12-15 13:19:33 +000048extern struct page *m2p_find_override(unsigned long mfn);
49extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn);
50
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070051static inline unsigned long pfn_to_mfn(unsigned long pfn)
52{
Jeremy Fitzhardingecfd89512010-08-31 14:06:22 -070053 unsigned long mfn;
54
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070055 if (xen_feature(XENFEAT_auto_translated_physmap))
56 return pfn;
57
Jeremy Fitzhardingecfd89512010-08-31 14:06:22 -070058 mfn = get_phys_to_machine(pfn);
59
60 if (mfn != INVALID_P2M_ENTRY)
61 mfn &= ~FOREIGN_FRAME_BIT;
62
63 return mfn;
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070064}
65
66static inline int phys_to_machine_mapping_valid(unsigned long pfn)
67{
68 if (xen_feature(XENFEAT_auto_translated_physmap))
69 return 1;
70
Jeremy Fitzhardinged451bb72008-05-26 23:31:18 +010071 return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY;
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070072}
73
74static inline unsigned long mfn_to_pfn(unsigned long mfn)
75{
76 unsigned long pfn;
77
78 if (xen_feature(XENFEAT_auto_translated_physmap))
79 return mfn;
80
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070081 pfn = 0;
82 /*
83 * The array access can fail (e.g., device space beyond end of RAM).
84 * In such cases it doesn't matter what we return (we return garbage),
85 * but we must handle the fault without crashing!
86 */
87 __get_user(pfn, &machine_to_phys_mapping[mfn]);
88
Jeremy Fitzhardinge448f28312010-12-15 13:19:33 +000089 /*
90 * If this appears to be a foreign mfn (because the pfn
91 * doesn't map back to the mfn), then check the local override
92 * table to see if there's a better pfn to use.
93 */
94 if (get_phys_to_machine(pfn) != mfn)
95 pfn = m2p_find_override_pfn(mfn, pfn);
96
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070097 return pfn;
98}
99
100static inline xmaddr_t phys_to_machine(xpaddr_t phys)
101{
102 unsigned offset = phys.paddr & ~PAGE_MASK;
Jeremy Fitzhardinge947d0492008-09-11 01:31:48 -0700103 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700104}
105
106static inline xpaddr_t machine_to_phys(xmaddr_t machine)
107{
108 unsigned offset = machine.maddr & ~PAGE_MASK;
Jeremy Fitzhardinge947d0492008-09-11 01:31:48 -0700109 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700110}
111
112/*
113 * We detect special mappings in one of two ways:
114 * 1. If the MFN is an I/O page then Xen will set the m2p entry
115 * to be outside our maximum possible pseudophys range.
116 * 2. If the MFN belongs to a different domain then we will certainly
117 * not have MFN in our p2m table. Conversely, if the page is ours,
118 * then we'll have p2m(m2p(MFN))==MFN.
119 * If we detect a special mapping then it doesn't have a 'struct page'.
120 * We force !pfn_valid() by returning an out-of-range pointer.
121 *
122 * NB. These checks require that, for any MFN that is not in our reservation,
123 * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
124 * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
125 * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
126 *
127 * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
128 * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
129 * require. In all the cases we care about, the FOREIGN_FRAME bit is
130 * masked (e.g., pfn_to_mfn()) so behaviour there is correct.
131 */
132static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
133{
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700134 unsigned long pfn = mfn_to_pfn(mfn);
Jeremy Fitzhardingec0011db2010-02-04 14:46:34 -0800135 if (get_phys_to_machine(pfn) != mfn)
136 return -1; /* force !pfn_valid() */
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700137 return pfn;
138}
139
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700140/* VIRT <-> MACHINE conversion */
141#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
Alex Nixonb40bf532009-02-09 12:05:46 -0800142#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
143#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700144#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
145
146static inline unsigned long pte_mfn(pte_t pte)
147{
Jeremy Fitzhardinge59438c92008-07-21 22:59:42 -0700148 return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT;
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700149}
150
151static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
152{
153 pte_t pte;
154
155 pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
Jeremy Fitzhardingeb5348162009-02-04 18:33:38 -0800156 massage_pgprot(pgprot);
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700157
158 return pte;
159}
160
161static inline pteval_t pte_val_ma(pte_t pte)
162{
163 return pte.pte;
164}
165
166static inline pte_t __pte_ma(pteval_t x)
167{
168 return (pte_t) { .pte = x };
169}
170
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700171#define pmd_val_ma(v) ((v).pmd)
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -0700172#ifdef __PAGETABLE_PUD_FOLDED
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700173#define pud_val_ma(v) ((v).pgd.pgd)
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -0700174#else
175#define pud_val_ma(v) ((v).pud)
176#endif
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700177#define __pmd_ma(x) ((pmd_t) { (x) } )
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700178
179#define pgd_val_ma(x) ((x).pgd)
180
Jeremy Fitzhardingeeba3ff82009-02-09 12:05:49 -0800181void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700182
Jeremy Fitzhardingece803e72008-07-08 15:06:55 -0700183xmaddr_t arbitrary_virt_to_machine(void *address);
Jeremy Fitzhardinge9976b392009-02-27 09:19:26 -0800184unsigned long arbitrary_virt_to_mfn(void *vaddr);
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -0700185void make_lowmem_page_readonly(void *vaddr);
186void make_lowmem_page_readwrite(void *vaddr);
187
H. Peter Anvin05e4d312008-10-23 00:01:39 -0700188#endif /* _ASM_X86_XEN_PAGE_H */