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Linux/arch/x86/include/asm/xen/page.h

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  1 #ifndef _ASM_X86_XEN_PAGE_H
  2 #define _ASM_X86_XEN_PAGE_H
  3 
  4 #include <linux/kernel.h>
  5 #include <linux/types.h>
  6 #include <linux/spinlock.h>
  7 #include <linux/pfn.h>
  8 #include <linux/mm.h>
  9 
 10 #include <asm/uaccess.h>
 11 #include <asm/page.h>
 12 #include <asm/pgtable.h>
 13 
 14 #include <xen/interface/xen.h>
 15 #include <xen/grant_table.h>
 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)
 33 #define FOREIGN_FRAME_BIT       (1UL<<(BITS_PER_LONG-1))
 34 #define IDENTITY_FRAME_BIT      (1UL<<(BITS_PER_LONG-2))
 35 #define FOREIGN_FRAME(m)        ((m) | FOREIGN_FRAME_BIT)
 36 #define IDENTITY_FRAME(m)       ((m) | IDENTITY_FRAME_BIT)
 37 
 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 
 42 extern unsigned long *machine_to_phys_mapping;
 43 extern unsigned long  machine_to_phys_nr;
 44 extern unsigned long *xen_p2m_addr;
 45 extern unsigned long  xen_p2m_size;
 46 extern unsigned long  xen_max_p2m_pfn;
 47 
 48 extern unsigned long get_phys_to_machine(unsigned long pfn);
 49 extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 50 extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 51 extern unsigned long set_phys_range_identity(unsigned long pfn_s,
 52                                              unsigned long pfn_e);
 53 
 54 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
 55                                    struct gnttab_map_grant_ref *kmap_ops,
 56                                    struct page **pages, unsigned int count);
 57 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
 58                                      struct gnttab_unmap_grant_ref *kunmap_ops,
 59                                      struct page **pages, unsigned int count);
 60 
 61 /*
 62  * Helper functions to write or read unsigned long values to/from
 63  * memory, when the access may fault.
 64  */
 65 static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
 66 {
 67         return __put_user(val, (unsigned long __user *)addr);
 68 }
 69 
 70 static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
 71 {
 72         return __get_user(*val, (unsigned long __user *)addr);
 73 }
 74 
 75 /*
 76  * When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
 77  * - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
 78  *   bits (identity or foreign) are set.
 79  * - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set
 80  *   identity or foreign indicator will be still set. __pfn_to_mfn() is
 81  *   encapsulating get_phys_to_machine() which is called in special cases only.
 82  * - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special
 83  *   cases needing an extended handling.
 84  */
 85 static inline unsigned long __pfn_to_mfn(unsigned long pfn)
 86 {
 87         unsigned long mfn;
 88 
 89         if (pfn < xen_p2m_size)
 90                 mfn = xen_p2m_addr[pfn];
 91         else if (unlikely(pfn < xen_max_p2m_pfn))
 92                 return get_phys_to_machine(pfn);
 93         else
 94                 return IDENTITY_FRAME(pfn);
 95 
 96         if (unlikely(mfn == INVALID_P2M_ENTRY))
 97                 return get_phys_to_machine(pfn);
 98 
 99         return mfn;
100 }
101 
102 static inline unsigned long pfn_to_mfn(unsigned long pfn)
103 {
104         unsigned long mfn;
105 
106         if (xen_feature(XENFEAT_auto_translated_physmap))
107                 return pfn;
108 
109         mfn = __pfn_to_mfn(pfn);
110 
111         if (mfn != INVALID_P2M_ENTRY)
112                 mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
113 
114         return mfn;
115 }
116 
117 static inline int phys_to_machine_mapping_valid(unsigned long pfn)
118 {
119         if (xen_feature(XENFEAT_auto_translated_physmap))
120                 return 1;
121 
122         return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY;
123 }
124 
125 static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
126 {
127         unsigned long pfn;
128         int ret;
129 
130         if (xen_feature(XENFEAT_auto_translated_physmap))
131                 return mfn;
132 
133         if (unlikely(mfn >= machine_to_phys_nr))
134                 return ~0;
135 
136         /*
137          * The array access can fail (e.g., device space beyond end of RAM).
138          * In such cases it doesn't matter what we return (we return garbage),
139          * but we must handle the fault without crashing!
140          */
141         ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn);
142         if (ret < 0)
143                 return ~0;
144 
145         return pfn;
146 }
147 
148 static inline unsigned long mfn_to_pfn(unsigned long mfn)
149 {
150         unsigned long pfn;
151 
152         if (xen_feature(XENFEAT_auto_translated_physmap))
153                 return mfn;
154 
155         pfn = mfn_to_pfn_no_overrides(mfn);
156         if (__pfn_to_mfn(pfn) != mfn)
157                 pfn = ~0;
158 
159         /*
160          * pfn is ~0 if there are no entries in the m2p for mfn or the
161          * entry doesn't map back to the mfn.
162          */
163         if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn))
164                 pfn = mfn;
165 
166         return pfn;
167 }
168 
169 static inline xmaddr_t phys_to_machine(xpaddr_t phys)
170 {
171         unsigned offset = phys.paddr & ~PAGE_MASK;
172         return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
173 }
174 
175 static inline xpaddr_t machine_to_phys(xmaddr_t machine)
176 {
177         unsigned offset = machine.maddr & ~PAGE_MASK;
178         return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
179 }
180 
181 /*
182  * We detect special mappings in one of two ways:
183  *  1. If the MFN is an I/O page then Xen will set the m2p entry
184  *     to be outside our maximum possible pseudophys range.
185  *  2. If the MFN belongs to a different domain then we will certainly
186  *     not have MFN in our p2m table. Conversely, if the page is ours,
187  *     then we'll have p2m(m2p(MFN))==MFN.
188  * If we detect a special mapping then it doesn't have a 'struct page'.
189  * We force !pfn_valid() by returning an out-of-range pointer.
190  *
191  * NB. These checks require that, for any MFN that is not in our reservation,
192  * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
193  * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
194  * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
195  *
196  * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
197  *      use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
198  *      require. In all the cases we care about, the FOREIGN_FRAME bit is
199  *      masked (e.g., pfn_to_mfn()) so behaviour there is correct.
200  */
201 static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
202 {
203         unsigned long pfn;
204 
205         if (xen_feature(XENFEAT_auto_translated_physmap))
206                 return mfn;
207 
208         pfn = mfn_to_pfn(mfn);
209         if (__pfn_to_mfn(pfn) != mfn)
210                 return -1; /* force !pfn_valid() */
211         return pfn;
212 }
213 
214 /* VIRT <-> MACHINE conversion */
215 #define virt_to_machine(v)      (phys_to_machine(XPADDR(__pa(v))))
216 #define virt_to_pfn(v)          (PFN_DOWN(__pa(v)))
217 #define virt_to_mfn(v)          (pfn_to_mfn(virt_to_pfn(v)))
218 #define mfn_to_virt(m)          (__va(mfn_to_pfn(m) << PAGE_SHIFT))
219 
220 static inline unsigned long pte_mfn(pte_t pte)
221 {
222         return (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT;
223 }
224 
225 static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
226 {
227         pte_t pte;
228 
229         pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
230                         massage_pgprot(pgprot);
231 
232         return pte;
233 }
234 
235 static inline pteval_t pte_val_ma(pte_t pte)
236 {
237         return pte.pte;
238 }
239 
240 static inline pte_t __pte_ma(pteval_t x)
241 {
242         return (pte_t) { .pte = x };
243 }
244 
245 #define pmd_val_ma(v) ((v).pmd)
246 #ifdef __PAGETABLE_PUD_FOLDED
247 #define pud_val_ma(v) ((v).pgd.pgd)
248 #else
249 #define pud_val_ma(v) ((v).pud)
250 #endif
251 #define __pmd_ma(x)     ((pmd_t) { (x) } )
252 
253 #define pgd_val_ma(x)   ((x).pgd)
254 
255 void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
256 
257 xmaddr_t arbitrary_virt_to_machine(void *address);
258 unsigned long arbitrary_virt_to_mfn(void *vaddr);
259 void make_lowmem_page_readonly(void *vaddr);
260 void make_lowmem_page_readwrite(void *vaddr);
261 
262 #define xen_remap(cookie, size) ioremap((cookie), (size));
263 #define xen_unmap(cookie) iounmap((cookie))
264 
265 static inline bool xen_arch_need_swiotlb(struct device *dev,
266                                          unsigned long pfn,
267                                          unsigned long mfn)
268 {
269         return false;
270 }
271 
272 static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
273 {
274         return __get_free_pages(__GFP_NOWARN, order);
275 }
276 
277 #endif /* _ASM_X86_XEN_PAGE_H */
278 

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