H. Peter Anvin | 05e4d31 | 2008-10-23 00:01:39 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_XEN_PAGE_H |
| 2 | #define _ASM_X86_XEN_PAGE_H |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 3 | |
Jeremy Fitzhardinge | ecbf29c | 2008-12-16 12:37:07 -0800 | [diff] [blame] | 4 | #include <linux/kernel.h> |
| 5 | #include <linux/types.h> |
| 6 | #include <linux/spinlock.h> |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 7 | #include <linux/pfn.h> |
Ian Campbell | 7e77506 | 2010-09-30 12:37:26 +0100 | [diff] [blame] | 8 | #include <linux/mm.h> |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 9 | |
| 10 | #include <asm/uaccess.h> |
Jeremy Fitzhardinge | ecbf29c | 2008-12-16 12:37:07 -0800 | [diff] [blame] | 11 | #include <asm/page.h> |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 12 | #include <asm/pgtable.h> |
| 13 | |
Jeremy Fitzhardinge | ecbf29c | 2008-12-16 12:37:07 -0800 | [diff] [blame] | 14 | #include <xen/interface/xen.h> |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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) |
Konrad Rzeszutek Wilk | f4cec35 | 2011-01-18 20:15:21 -0500 | [diff] [blame] | 32 | #define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1)) |
| 33 | #define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2)) |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 34 | #define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT) |
Konrad Rzeszutek Wilk | f4cec35 | 2011-01-18 20:15:21 -0500 | [diff] [blame] | 35 | #define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT) |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 36 | |
Jeremy Fitzhardinge | 8006ec3 | 2008-05-26 23:31:19 +0100 | [diff] [blame] | 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 | |
Ian Campbell | 7e77506 | 2010-09-30 12:37:26 +0100 | [diff] [blame] | 41 | extern unsigned long *machine_to_phys_mapping; |
| 42 | extern unsigned int machine_to_phys_order; |
Jeremy Fitzhardinge | 8006ec3 | 2008-05-26 23:31:19 +0100 | [diff] [blame] | 43 | |
Jeremy Fitzhardinge | d451bb7 | 2008-05-26 23:31:18 +0100 | [diff] [blame] | 44 | extern unsigned long get_phys_to_machine(unsigned long pfn); |
Jeremy Fitzhardinge | c379806 | 2010-08-27 13:42:04 -0700 | [diff] [blame] | 45 | extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
Konrad Rzeszutek Wilk | 6eaa412 | 2011-01-18 20:09:41 -0500 | [diff] [blame] | 46 | extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); |
Konrad Rzeszutek Wilk | f4cec35 | 2011-01-18 20:15:21 -0500 | [diff] [blame] | 47 | extern unsigned long set_phys_range_identity(unsigned long pfn_s, |
| 48 | unsigned long pfn_e); |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 49 | |
Jeremy Fitzhardinge | 87f1d40 | 2010-12-13 14:42:30 +0000 | [diff] [blame] | 50 | extern int m2p_add_override(unsigned long mfn, struct page *page); |
| 51 | extern int m2p_remove_override(struct page *page); |
Jeremy Fitzhardinge | 448f2831 | 2010-12-15 13:19:33 +0000 | [diff] [blame] | 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 | |
Konrad Rzeszutek Wilk | 2222e71 | 2010-12-22 08:57:30 -0500 | [diff] [blame] | 55 | #ifdef CONFIG_XEN_DEBUG_FS |
| 56 | extern int p2m_dump_show(struct seq_file *m, void *v); |
| 57 | #endif |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 58 | static inline unsigned long pfn_to_mfn(unsigned long pfn) |
| 59 | { |
Jeremy Fitzhardinge | cfd8951 | 2010-08-31 14:06:22 -0700 | [diff] [blame] | 60 | unsigned long mfn; |
| 61 | |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 62 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
| 63 | return pfn; |
| 64 | |
Jeremy Fitzhardinge | cfd8951 | 2010-08-31 14:06:22 -0700 | [diff] [blame] | 65 | mfn = get_phys_to_machine(pfn); |
| 66 | |
| 67 | if (mfn != INVALID_P2M_ENTRY) |
Konrad Rzeszutek Wilk | f4cec35 | 2011-01-18 20:15:21 -0500 | [diff] [blame] | 68 | mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT); |
Jeremy Fitzhardinge | cfd8951 | 2010-08-31 14:06:22 -0700 | [diff] [blame] | 69 | |
| 70 | return mfn; |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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 | |
Jeremy Fitzhardinge | d451bb7 | 2008-05-26 23:31:18 +0100 | [diff] [blame] | 78 | return get_phys_to_machine(pfn) != INVALID_P2M_ENTRY; |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static inline unsigned long mfn_to_pfn(unsigned long mfn) |
| 82 | { |
| 83 | unsigned long pfn; |
Stefano Stabellini | 706cc9d | 2011-02-02 18:32:59 +0000 | [diff] [blame^] | 84 | int ret = 0; |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 85 | |
| 86 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
| 87 | return mfn; |
| 88 | |
Konrad Rzeszutek Wilk | 146c4e5 | 2011-01-14 17:55:44 -0500 | [diff] [blame] | 89 | if (unlikely((mfn >> machine_to_phys_order) != 0)) { |
| 90 | pfn = ~0; |
| 91 | goto try_override; |
| 92 | } |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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 | */ |
Stefano Stabellini | 706cc9d | 2011-02-02 18:32:59 +0000 | [diff] [blame^] | 99 | ret = __get_user(pfn, &machine_to_phys_mapping[mfn]); |
Konrad Rzeszutek Wilk | 146c4e5 | 2011-01-14 17:55:44 -0500 | [diff] [blame] | 100 | try_override: |
Stefano Stabellini | 706cc9d | 2011-02-02 18:32:59 +0000 | [diff] [blame^] | 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. |
Jeremy Fitzhardinge | 448f2831 | 2010-12-15 13:19:33 +0000 | [diff] [blame] | 118 | */ |
Stefano Stabellini | 706cc9d | 2011-02-02 18:32:59 +0000 | [diff] [blame^] | 119 | if (pfn == ~0 && |
| 120 | get_phys_to_machine(mfn) == IDENTITY_FRAME(mfn)) |
| 121 | pfn = mfn; |
Jeremy Fitzhardinge | 448f2831 | 2010-12-15 13:19:33 +0000 | [diff] [blame] | 122 | |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 123 | return pfn; |
| 124 | } |
| 125 | |
| 126 | static inline xmaddr_t phys_to_machine(xpaddr_t phys) |
| 127 | { |
| 128 | unsigned offset = phys.paddr & ~PAGE_MASK; |
Jeremy Fitzhardinge | 947d049 | 2008-09-11 01:31:48 -0700 | [diff] [blame] | 129 | return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static inline xpaddr_t machine_to_phys(xmaddr_t machine) |
| 133 | { |
| 134 | unsigned offset = machine.maddr & ~PAGE_MASK; |
Jeremy Fitzhardinge | 947d049 | 2008-09-11 01:31:48 -0700 | [diff] [blame] | 135 | return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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 | { |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 160 | unsigned long pfn = mfn_to_pfn(mfn); |
Jeremy Fitzhardinge | c0011db | 2010-02-04 14:46:34 -0800 | [diff] [blame] | 161 | if (get_phys_to_machine(pfn) != mfn) |
| 162 | return -1; /* force !pfn_valid() */ |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 163 | return pfn; |
| 164 | } |
| 165 | |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 166 | /* VIRT <-> MACHINE conversion */ |
| 167 | #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) |
Alex Nixon | b40bf53 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 168 | #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) |
| 169 | #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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 | { |
Jeremy Fitzhardinge | 59438c9 | 2008-07-21 22:59:42 -0700 | [diff] [blame] | 174 | return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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) | |
Jeremy Fitzhardinge | b534816 | 2009-02-04 18:33:38 -0800 | [diff] [blame] | 182 | massage_pgprot(pgprot); |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 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 | |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 197 | #define pmd_val_ma(v) ((v).pmd) |
Jeremy Fitzhardinge | f6e5873 | 2008-07-08 15:06:38 -0700 | [diff] [blame] | 198 | #ifdef __PAGETABLE_PUD_FOLDED |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 199 | #define pud_val_ma(v) ((v).pgd.pgd) |
Jeremy Fitzhardinge | f6e5873 | 2008-07-08 15:06:38 -0700 | [diff] [blame] | 200 | #else |
| 201 | #define pud_val_ma(v) ((v).pud) |
| 202 | #endif |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 203 | #define __pmd_ma(x) ((pmd_t) { (x) } ) |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 204 | |
| 205 | #define pgd_val_ma(x) ((x).pgd) |
| 206 | |
Jeremy Fitzhardinge | eba3ff8 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 207 | void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid); |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 208 | |
Jeremy Fitzhardinge | ce803e7 | 2008-07-08 15:06:55 -0700 | [diff] [blame] | 209 | xmaddr_t arbitrary_virt_to_machine(void *address); |
Jeremy Fitzhardinge | 9976b39 | 2009-02-27 09:19:26 -0800 | [diff] [blame] | 210 | unsigned long arbitrary_virt_to_mfn(void *vaddr); |
Isaku Yamahata | 20e71f2e | 2008-04-02 10:53:58 -0700 | [diff] [blame] | 211 | void make_lowmem_page_readonly(void *vaddr); |
| 212 | void make_lowmem_page_readwrite(void *vaddr); |
| 213 | |
H. Peter Anvin | 05e4d31 | 2008-10-23 00:01:39 -0700 | [diff] [blame] | 214 | #endif /* _ASM_X86_XEN_PAGE_H */ |