1
2#ifndef _ASM_X86_XEN_PAGE_H
3#define _ASM_X86_XEN_PAGE_H
4
5#include <linux/kernel.h>
6#include <linux/types.h>
7#include <linux/spinlock.h>
8#include <linux/pfn.h>
9#include <linux/mm.h>
10#include <linux/device.h>
11
12#include <linux/uaccess.h>
13#include <asm/page.h>
14#include <asm/pgtable.h>
15
16#include <xen/interface/xen.h>
17#include <xen/interface/grant_table.h>
18#include <xen/features.h>
19
20
21typedef struct xmaddr {
22 phys_addr_t maddr;
23} xmaddr_t;
24
25
26typedef struct xpaddr {
27 phys_addr_t paddr;
28} xpaddr_t;
29
30#ifdef CONFIG_X86_64
31#define XEN_PHYSICAL_MASK __sme_clr((1UL << 52) - 1)
32#else
33#define XEN_PHYSICAL_MASK __PHYSICAL_MASK
34#endif
35
36#define XEN_PTE_MFN_MASK ((pteval_t)(((signed long)PAGE_MASK) & \
37 XEN_PHYSICAL_MASK))
38
39#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
40#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
41
42
43#define INVALID_P2M_ENTRY (~0UL)
44#define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1))
45#define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2))
46#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
47#define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT)
48
49#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
50
51extern unsigned long *machine_to_phys_mapping;
52extern unsigned long machine_to_phys_nr;
53extern unsigned long *xen_p2m_addr;
54extern unsigned long xen_p2m_size;
55extern unsigned long xen_max_p2m_pfn;
56
57extern int xen_alloc_p2m_entry(unsigned long pfn);
58
59extern unsigned long get_phys_to_machine(unsigned long pfn);
60extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
61extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
62extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
63 unsigned long pfn_e);
64
65#ifdef CONFIG_XEN_PV
66extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
67 struct gnttab_map_grant_ref *kmap_ops,
68 struct page **pages, unsigned int count);
69extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
70 struct gnttab_unmap_grant_ref *kunmap_ops,
71 struct page **pages, unsigned int count);
72#else
73static inline int
74set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
75 struct gnttab_map_grant_ref *kmap_ops,
76 struct page **pages, unsigned int count)
77{
78 return 0;
79}
80
81static inline int
82clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
83 struct gnttab_unmap_grant_ref *kunmap_ops,
84 struct page **pages, unsigned int count)
85{
86 return 0;
87}
88#endif
89
90
91
92
93
94static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
95{
96 return __put_user(val, (unsigned long __user *)addr);
97}
98
99static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
100{
101 return __get_user(*val, (unsigned long __user *)addr);
102}
103
104#ifdef CONFIG_XEN_PV
105
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112
113
114
115static inline unsigned long __pfn_to_mfn(unsigned long pfn)
116{
117 unsigned long mfn;
118
119 if (pfn < xen_p2m_size)
120 mfn = xen_p2m_addr[pfn];
121 else if (unlikely(pfn < xen_max_p2m_pfn))
122 return get_phys_to_machine(pfn);
123 else
124 return IDENTITY_FRAME(pfn);
125
126 if (unlikely(mfn == INVALID_P2M_ENTRY))
127 return get_phys_to_machine(pfn);
128
129 return mfn;
130}
131#else
132static inline unsigned long __pfn_to_mfn(unsigned long pfn)
133{
134 return pfn;
135}
136#endif
137
138static inline unsigned long pfn_to_mfn(unsigned long pfn)
139{
140 unsigned long mfn;
141
142
143
144
145
146
147 if (xen_feature(XENFEAT_auto_translated_physmap))
148 return pfn;
149
150 mfn = __pfn_to_mfn(pfn);
151
152 if (mfn != INVALID_P2M_ENTRY)
153 mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
154
155 return mfn;
156}
157
158static inline int phys_to_machine_mapping_valid(unsigned long pfn)
159{
160 if (xen_feature(XENFEAT_auto_translated_physmap))
161 return 1;
162
163 return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY;
164}
165
166static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
167{
168 unsigned long pfn;
169 int ret;
170
171 if (unlikely(mfn >= machine_to_phys_nr))
172 return ~0;
173
174
175
176
177
178
179 ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn);
180 if (ret < 0)
181 return ~0;
182
183 return pfn;
184}
185
186static inline unsigned long mfn_to_pfn(unsigned long mfn)
187{
188 unsigned long pfn;
189
190
191
192
193
194
195 if (xen_feature(XENFEAT_auto_translated_physmap))
196 return mfn;
197
198 pfn = mfn_to_pfn_no_overrides(mfn);
199 if (__pfn_to_mfn(pfn) != mfn)
200 pfn = ~0;
201
202
203
204
205
206 if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn))
207 pfn = mfn;
208
209 return pfn;
210}
211
212static inline xmaddr_t phys_to_machine(xpaddr_t phys)
213{
214 unsigned offset = phys.paddr & ~PAGE_MASK;
215 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
216}
217
218static inline xpaddr_t machine_to_phys(xmaddr_t machine)
219{
220 unsigned offset = machine.maddr & ~PAGE_MASK;
221 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
222}
223
224
225static inline unsigned long pfn_to_gfn(unsigned long pfn)
226{
227 if (xen_feature(XENFEAT_auto_translated_physmap))
228 return pfn;
229 else
230 return pfn_to_mfn(pfn);
231}
232
233static inline unsigned long gfn_to_pfn(unsigned long gfn)
234{
235 if (xen_feature(XENFEAT_auto_translated_physmap))
236 return gfn;
237 else
238 return mfn_to_pfn(gfn);
239}
240
241
242#define pfn_to_bfn(pfn) pfn_to_gfn(pfn)
243#define bfn_to_pfn(bfn) gfn_to_pfn(bfn)
244
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263
264
265static inline unsigned long bfn_to_local_pfn(unsigned long mfn)
266{
267 unsigned long pfn;
268
269 if (xen_feature(XENFEAT_auto_translated_physmap))
270 return mfn;
271
272 pfn = mfn_to_pfn(mfn);
273 if (__pfn_to_mfn(pfn) != mfn)
274 return -1;
275 return pfn;
276}
277
278
279#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
280#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
281#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
282#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
283
284
285#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v)))
286#define gfn_to_virt(g) (__va(gfn_to_pfn(g) << PAGE_SHIFT))
287
288static inline unsigned long pte_mfn(pte_t pte)
289{
290 return (pte.pte & XEN_PTE_MFN_MASK) >> PAGE_SHIFT;
291}
292
293static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
294{
295 pte_t pte;
296
297 pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
298 massage_pgprot(pgprot);
299
300 return pte;
301}
302
303static inline pteval_t pte_val_ma(pte_t pte)
304{
305 return pte.pte;
306}
307
308static inline pte_t __pte_ma(pteval_t x)
309{
310 return (pte_t) { .pte = x };
311}
312
313#define pmd_val_ma(v) ((v).pmd)
314#ifdef __PAGETABLE_PUD_FOLDED
315#define pud_val_ma(v) ((v).p4d.pgd.pgd)
316#else
317#define pud_val_ma(v) ((v).pud)
318#endif
319#define __pmd_ma(x) ((pmd_t) { (x) } )
320
321#ifdef __PAGETABLE_P4D_FOLDED
322#define p4d_val_ma(x) ((x).pgd.pgd)
323#else
324#define p4d_val_ma(x) ((x).p4d)
325#endif
326
327xmaddr_t arbitrary_virt_to_machine(void *address);
328unsigned long arbitrary_virt_to_mfn(void *vaddr);
329void make_lowmem_page_readonly(void *vaddr);
330void make_lowmem_page_readwrite(void *vaddr);
331
332#define xen_remap(cookie, size) ioremap((cookie), (size));
333#define xen_unmap(cookie) iounmap((cookie))
334
335static inline bool xen_arch_need_swiotlb(struct device *dev,
336 phys_addr_t phys,
337 dma_addr_t dev_addr)
338{
339 return false;
340}
341
342static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
343{
344 return __get_free_pages(__GFP_NOWARN, order);
345}
346
347#endif
348