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 <asm/extable.h>
13#include <asm/page.h>
14
15#include <xen/interface/xen.h>
16#include <xen/interface/grant_table.h>
17#include <xen/features.h>
18
19
20typedef struct xmaddr {
21 phys_addr_t maddr;
22} xmaddr_t;
23
24
25typedef struct xpaddr {
26 phys_addr_t paddr;
27} xpaddr_t;
28
29#ifdef CONFIG_X86_64
30#define XEN_PHYSICAL_MASK __sme_clr((1UL << 52) - 1)
31#else
32#define XEN_PHYSICAL_MASK __PHYSICAL_MASK
33#endif
34
35#define XEN_PTE_MFN_MASK ((pteval_t)(((signed long)PAGE_MASK) & \
36 XEN_PHYSICAL_MASK))
37
38#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
39#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
40
41
42#define INVALID_P2M_ENTRY (~0UL)
43#define FOREIGN_FRAME_BIT (1UL<<(BITS_PER_LONG-1))
44#define IDENTITY_FRAME_BIT (1UL<<(BITS_PER_LONG-2))
45#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
46#define IDENTITY_FRAME(m) ((m) | IDENTITY_FRAME_BIT)
47
48#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
49
50extern unsigned long *machine_to_phys_mapping;
51extern unsigned long machine_to_phys_nr;
52extern unsigned long *xen_p2m_addr;
53extern unsigned long xen_p2m_size;
54extern unsigned long xen_max_p2m_pfn;
55
56extern int xen_alloc_p2m_entry(unsigned long pfn);
57
58extern unsigned long get_phys_to_machine(unsigned long pfn);
59extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn);
60extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
61extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
62 unsigned long pfn_e);
63
64#ifdef CONFIG_XEN_PV
65extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
66 struct gnttab_map_grant_ref *kmap_ops,
67 struct page **pages, unsigned int count);
68extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
69 struct gnttab_unmap_grant_ref *kunmap_ops,
70 struct page **pages, unsigned int count);
71#else
72static inline int
73set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
74 struct gnttab_map_grant_ref *kmap_ops,
75 struct page **pages, unsigned int count)
76{
77 return 0;
78}
79
80static inline int
81clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
82 struct gnttab_unmap_grant_ref *kunmap_ops,
83 struct page **pages, unsigned int count)
84{
85 return 0;
86}
87#endif
88
89
90
91
92
93static inline int xen_safe_write_ulong(unsigned long *addr, unsigned long val)
94{
95 int ret = 0;
96
97 asm volatile("1: mov %[val], %[ptr]\n"
98 "2:\n"
99 ".section .fixup, \"ax\"\n"
100 "3: sub $1, %[ret]\n"
101 " jmp 2b\n"
102 ".previous\n"
103 _ASM_EXTABLE(1b, 3b)
104 : [ret] "+r" (ret), [ptr] "=m" (*addr)
105 : [val] "r" (val));
106
107 return ret;
108}
109
110static inline int xen_safe_read_ulong(const unsigned long *addr,
111 unsigned long *val)
112{
113 int ret = 0;
114 unsigned long rval = ~0ul;
115
116 asm volatile("1: mov %[ptr], %[rval]\n"
117 "2:\n"
118 ".section .fixup, \"ax\"\n"
119 "3: sub $1, %[ret]\n"
120 " jmp 2b\n"
121 ".previous\n"
122 _ASM_EXTABLE(1b, 3b)
123 : [ret] "+r" (ret), [rval] "+r" (rval)
124 : [ptr] "m" (*addr));
125 *val = rval;
126
127 return ret;
128}
129
130#ifdef CONFIG_XEN_PV
131
132
133
134
135
136
137
138
139
140
141static inline unsigned long __pfn_to_mfn(unsigned long pfn)
142{
143 unsigned long mfn;
144
145 if (pfn < xen_p2m_size)
146 mfn = xen_p2m_addr[pfn];
147 else if (unlikely(pfn < xen_max_p2m_pfn))
148 return get_phys_to_machine(pfn);
149 else
150 return IDENTITY_FRAME(pfn);
151
152 if (unlikely(mfn == INVALID_P2M_ENTRY))
153 return get_phys_to_machine(pfn);
154
155 return mfn;
156}
157#else
158static inline unsigned long __pfn_to_mfn(unsigned long pfn)
159{
160 return pfn;
161}
162#endif
163
164static inline unsigned long pfn_to_mfn(unsigned long pfn)
165{
166 unsigned long mfn;
167
168
169
170
171
172
173 if (xen_feature(XENFEAT_auto_translated_physmap))
174 return pfn;
175
176 mfn = __pfn_to_mfn(pfn);
177
178 if (mfn != INVALID_P2M_ENTRY)
179 mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);
180
181 return mfn;
182}
183
184static inline int phys_to_machine_mapping_valid(unsigned long pfn)
185{
186 if (xen_feature(XENFEAT_auto_translated_physmap))
187 return 1;
188
189 return __pfn_to_mfn(pfn) != INVALID_P2M_ENTRY;
190}
191
192static inline unsigned long mfn_to_pfn_no_overrides(unsigned long mfn)
193{
194 unsigned long pfn;
195 int ret;
196
197 if (unlikely(mfn >= machine_to_phys_nr))
198 return ~0;
199
200
201
202
203
204
205 ret = xen_safe_read_ulong(&machine_to_phys_mapping[mfn], &pfn);
206 if (ret < 0)
207 return ~0;
208
209 return pfn;
210}
211
212static inline unsigned long mfn_to_pfn(unsigned long mfn)
213{
214 unsigned long pfn;
215
216
217
218
219
220
221 if (xen_feature(XENFEAT_auto_translated_physmap))
222 return mfn;
223
224 pfn = mfn_to_pfn_no_overrides(mfn);
225 if (__pfn_to_mfn(pfn) != mfn)
226 pfn = ~0;
227
228
229
230
231
232 if (pfn == ~0 && __pfn_to_mfn(mfn) == IDENTITY_FRAME(mfn))
233 pfn = mfn;
234
235 return pfn;
236}
237
238static inline xmaddr_t phys_to_machine(xpaddr_t phys)
239{
240 unsigned offset = phys.paddr & ~PAGE_MASK;
241 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
242}
243
244static inline xpaddr_t machine_to_phys(xmaddr_t machine)
245{
246 unsigned offset = machine.maddr & ~PAGE_MASK;
247 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
248}
249
250
251static inline unsigned long pfn_to_gfn(unsigned long pfn)
252{
253 if (xen_feature(XENFEAT_auto_translated_physmap))
254 return pfn;
255 else
256 return pfn_to_mfn(pfn);
257}
258
259static inline unsigned long gfn_to_pfn(unsigned long gfn)
260{
261 if (xen_feature(XENFEAT_auto_translated_physmap))
262 return gfn;
263 else
264 return mfn_to_pfn(gfn);
265}
266
267
268#define pfn_to_bfn(pfn) pfn_to_gfn(pfn)
269#define bfn_to_pfn(bfn) gfn_to_pfn(bfn)
270
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290
291static inline unsigned long bfn_to_local_pfn(unsigned long mfn)
292{
293 unsigned long pfn;
294
295 if (xen_feature(XENFEAT_auto_translated_physmap))
296 return mfn;
297
298 pfn = mfn_to_pfn(mfn);
299 if (__pfn_to_mfn(pfn) != mfn)
300 return -1;
301 return pfn;
302}
303
304
305#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
306#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
307#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
308#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
309
310
311#define virt_to_gfn(v) (pfn_to_gfn(virt_to_pfn(v)))
312#define gfn_to_virt(g) (__va(gfn_to_pfn(g) << PAGE_SHIFT))
313
314static inline unsigned long pte_mfn(pte_t pte)
315{
316 return (pte.pte & XEN_PTE_MFN_MASK) >> PAGE_SHIFT;
317}
318
319static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
320{
321 pte_t pte;
322
323 pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
324 massage_pgprot(pgprot);
325
326 return pte;
327}
328
329static inline pteval_t pte_val_ma(pte_t pte)
330{
331 return pte.pte;
332}
333
334static inline pte_t __pte_ma(pteval_t x)
335{
336 return (pte_t) { .pte = x };
337}
338
339#define pmd_val_ma(v) ((v).pmd)
340#ifdef __PAGETABLE_PUD_FOLDED
341#define pud_val_ma(v) ((v).p4d.pgd.pgd)
342#else
343#define pud_val_ma(v) ((v).pud)
344#endif
345#define __pmd_ma(x) ((pmd_t) { (x) } )
346
347#ifdef __PAGETABLE_P4D_FOLDED
348#define p4d_val_ma(x) ((x).pgd.pgd)
349#else
350#define p4d_val_ma(x) ((x).p4d)
351#endif
352
353xmaddr_t arbitrary_virt_to_machine(void *address);
354unsigned long arbitrary_virt_to_mfn(void *vaddr);
355void make_lowmem_page_readonly(void *vaddr);
356void make_lowmem_page_readwrite(void *vaddr);
357
358#define xen_remap(cookie, size) ioremap((cookie), (size))
359#define xen_unmap(cookie) iounmap((cookie))
360
361static inline bool xen_arch_need_swiotlb(struct device *dev,
362 phys_addr_t phys,
363 dma_addr_t dev_addr)
364{
365 return false;
366}
367
368static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
369{
370 return __get_free_pages(__GFP_NOWARN, order);
371}
372
373#endif
374