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[~shefty/rdma-dev.git] / arch / x86 / include / asm / xen / hypercall.h
1 /******************************************************************************
2  * hypercall.h
3  *
4  * Linux-specific hypervisor handling.
5  *
6  * Copyright (c) 2002-2004, K A Fraser
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License version 2
10  * as published by the Free Software Foundation; or, when distributed
11  * separately from the Linux kernel or incorporated into other
12  * software packages, subject to the following license:
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a copy
15  * of this source file (the "Software"), to deal in the Software without
16  * restriction, including without limitation the rights to use, copy, modify,
17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18  * and to permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be included in
22  * all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30  * IN THE SOFTWARE.
31  */
32
33 #ifndef _ASM_X86_XEN_HYPERCALL_H
34 #define _ASM_X86_XEN_HYPERCALL_H
35
36 #include <linux/kernel.h>
37 #include <linux/spinlock.h>
38 #include <linux/errno.h>
39 #include <linux/string.h>
40 #include <linux/types.h>
41
42 #include <trace/events/xen.h>
43
44 #include <asm/page.h>
45 #include <asm/pgtable.h>
46
47 #include <xen/interface/xen.h>
48 #include <xen/interface/sched.h>
49 #include <xen/interface/physdev.h>
50
51 /*
52  * The hypercall asms have to meet several constraints:
53  * - Work on 32- and 64-bit.
54  *    The two architectures put their arguments in different sets of
55  *    registers.
56  *
57  * - Work around asm syntax quirks
58  *    It isn't possible to specify one of the rNN registers in a
59  *    constraint, so we use explicit register variables to get the
60  *    args into the right place.
61  *
62  * - Mark all registers as potentially clobbered
63  *    Even unused parameters can be clobbered by the hypervisor, so we
64  *    need to make sure gcc knows it.
65  *
66  * - Avoid compiler bugs.
67  *    This is the tricky part.  Because x86_32 has such a constrained
68  *    register set, gcc versions below 4.3 have trouble generating
69  *    code when all the arg registers and memory are trashed by the
70  *    asm.  There are syntactically simpler ways of achieving the
71  *    semantics below, but they cause the compiler to crash.
72  *
73  *    The only combination I found which works is:
74  *     - assign the __argX variables first
75  *     - list all actually used parameters as "+r" (__argX)
76  *     - clobber the rest
77  *
78  * The result certainly isn't pretty, and it really shows up cpp's
79  * weakness as as macro language.  Sorry.  (But let's just give thanks
80  * there aren't more than 5 arguments...)
81  */
82
83 extern struct { char _entry[32]; } hypercall_page[];
84
85 #define __HYPERCALL             "call hypercall_page+%c[offset]"
86 #define __HYPERCALL_ENTRY(x)                                            \
87         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
88
89 #ifdef CONFIG_X86_32
90 #define __HYPERCALL_RETREG      "eax"
91 #define __HYPERCALL_ARG1REG     "ebx"
92 #define __HYPERCALL_ARG2REG     "ecx"
93 #define __HYPERCALL_ARG3REG     "edx"
94 #define __HYPERCALL_ARG4REG     "esi"
95 #define __HYPERCALL_ARG5REG     "edi"
96 #else
97 #define __HYPERCALL_RETREG      "rax"
98 #define __HYPERCALL_ARG1REG     "rdi"
99 #define __HYPERCALL_ARG2REG     "rsi"
100 #define __HYPERCALL_ARG3REG     "rdx"
101 #define __HYPERCALL_ARG4REG     "r10"
102 #define __HYPERCALL_ARG5REG     "r8"
103 #endif
104
105 #define __HYPERCALL_DECLS                                               \
106         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
107         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
108         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
109         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
110         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
111         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
112
113 #define __HYPERCALL_0PARAM      "=r" (__res)
114 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
115 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
116 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
117 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
118 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
119
120 #define __HYPERCALL_0ARG()
121 #define __HYPERCALL_1ARG(a1)                                            \
122         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
123 #define __HYPERCALL_2ARG(a1,a2)                                         \
124         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
125 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
126         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
127 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
128         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
129 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
130         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
131
132 #define __HYPERCALL_CLOBBER5    "memory"
133 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
134 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
135 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
136 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
137 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
138
139 #define _hypercall0(type, name)                                         \
140 ({                                                                      \
141         __HYPERCALL_DECLS;                                              \
142         __HYPERCALL_0ARG();                                             \
143         asm volatile (__HYPERCALL                                       \
144                       : __HYPERCALL_0PARAM                              \
145                       : __HYPERCALL_ENTRY(name)                         \
146                       : __HYPERCALL_CLOBBER0);                          \
147         (type)__res;                                                    \
148 })
149
150 #define _hypercall1(type, name, a1)                                     \
151 ({                                                                      \
152         __HYPERCALL_DECLS;                                              \
153         __HYPERCALL_1ARG(a1);                                           \
154         asm volatile (__HYPERCALL                                       \
155                       : __HYPERCALL_1PARAM                              \
156                       : __HYPERCALL_ENTRY(name)                         \
157                       : __HYPERCALL_CLOBBER1);                          \
158         (type)__res;                                                    \
159 })
160
161 #define _hypercall2(type, name, a1, a2)                                 \
162 ({                                                                      \
163         __HYPERCALL_DECLS;                                              \
164         __HYPERCALL_2ARG(a1, a2);                                       \
165         asm volatile (__HYPERCALL                                       \
166                       : __HYPERCALL_2PARAM                              \
167                       : __HYPERCALL_ENTRY(name)                         \
168                       : __HYPERCALL_CLOBBER2);                          \
169         (type)__res;                                                    \
170 })
171
172 #define _hypercall3(type, name, a1, a2, a3)                             \
173 ({                                                                      \
174         __HYPERCALL_DECLS;                                              \
175         __HYPERCALL_3ARG(a1, a2, a3);                                   \
176         asm volatile (__HYPERCALL                                       \
177                       : __HYPERCALL_3PARAM                              \
178                       : __HYPERCALL_ENTRY(name)                         \
179                       : __HYPERCALL_CLOBBER3);                          \
180         (type)__res;                                                    \
181 })
182
183 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
184 ({                                                                      \
185         __HYPERCALL_DECLS;                                              \
186         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
187         asm volatile (__HYPERCALL                                       \
188                       : __HYPERCALL_4PARAM                              \
189                       : __HYPERCALL_ENTRY(name)                         \
190                       : __HYPERCALL_CLOBBER4);                          \
191         (type)__res;                                                    \
192 })
193
194 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
195 ({                                                                      \
196         __HYPERCALL_DECLS;                                              \
197         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
198         asm volatile (__HYPERCALL                                       \
199                       : __HYPERCALL_5PARAM                              \
200                       : __HYPERCALL_ENTRY(name)                         \
201                       : __HYPERCALL_CLOBBER5);                          \
202         (type)__res;                                                    \
203 })
204
205 static inline long
206 privcmd_call(unsigned call,
207              unsigned long a1, unsigned long a2,
208              unsigned long a3, unsigned long a4,
209              unsigned long a5)
210 {
211         __HYPERCALL_DECLS;
212         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
213
214         asm volatile("call *%[call]"
215                      : __HYPERCALL_5PARAM
216                      : [call] "a" (&hypercall_page[call])
217                      : __HYPERCALL_CLOBBER5);
218
219         return (long)__res;
220 }
221
222 static inline int
223 HYPERVISOR_set_trap_table(struct trap_info *table)
224 {
225         return _hypercall1(int, set_trap_table, table);
226 }
227
228 static inline int
229 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
230                       int *success_count, domid_t domid)
231 {
232         return _hypercall4(int, mmu_update, req, count, success_count, domid);
233 }
234
235 static inline int
236 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
237                      int *success_count, domid_t domid)
238 {
239         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
240 }
241
242 static inline int
243 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
244 {
245         return _hypercall2(int, set_gdt, frame_list, entries);
246 }
247
248 static inline int
249 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
250 {
251         return _hypercall2(int, stack_switch, ss, esp);
252 }
253
254 #ifdef CONFIG_X86_32
255 static inline int
256 HYPERVISOR_set_callbacks(unsigned long event_selector,
257                          unsigned long event_address,
258                          unsigned long failsafe_selector,
259                          unsigned long failsafe_address)
260 {
261         return _hypercall4(int, set_callbacks,
262                            event_selector, event_address,
263                            failsafe_selector, failsafe_address);
264 }
265 #else  /* CONFIG_X86_64 */
266 static inline int
267 HYPERVISOR_set_callbacks(unsigned long event_address,
268                         unsigned long failsafe_address,
269                         unsigned long syscall_address)
270 {
271         return _hypercall3(int, set_callbacks,
272                            event_address, failsafe_address,
273                            syscall_address);
274 }
275 #endif  /* CONFIG_X86_{32,64} */
276
277 static inline int
278 HYPERVISOR_callback_op(int cmd, void *arg)
279 {
280         return _hypercall2(int, callback_op, cmd, arg);
281 }
282
283 static inline int
284 HYPERVISOR_fpu_taskswitch(int set)
285 {
286         return _hypercall1(int, fpu_taskswitch, set);
287 }
288
289 static inline int
290 HYPERVISOR_sched_op(int cmd, void *arg)
291 {
292         return _hypercall2(int, sched_op, cmd, arg);
293 }
294
295 static inline long
296 HYPERVISOR_set_timer_op(u64 timeout)
297 {
298         unsigned long timeout_hi = (unsigned long)(timeout>>32);
299         unsigned long timeout_lo = (unsigned long)timeout;
300         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
301 }
302
303 static inline int
304 HYPERVISOR_set_debugreg(int reg, unsigned long value)
305 {
306         return _hypercall2(int, set_debugreg, reg, value);
307 }
308
309 static inline unsigned long
310 HYPERVISOR_get_debugreg(int reg)
311 {
312         return _hypercall1(unsigned long, get_debugreg, reg);
313 }
314
315 static inline int
316 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
317 {
318         if (sizeof(u64) == sizeof(long))
319                 return _hypercall2(int, update_descriptor, ma, desc);
320         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
321 }
322
323 static inline int
324 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
325 {
326         return _hypercall2(int, memory_op, cmd, arg);
327 }
328
329 static inline int
330 HYPERVISOR_multicall(void *call_list, int nr_calls)
331 {
332         return _hypercall2(int, multicall, call_list, nr_calls);
333 }
334
335 static inline int
336 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
337                              unsigned long flags)
338 {
339         if (sizeof(new_val) == sizeof(long))
340                 return _hypercall3(int, update_va_mapping, va,
341                                    new_val.pte, flags);
342         else
343                 return _hypercall4(int, update_va_mapping, va,
344                                    new_val.pte, new_val.pte >> 32, flags);
345 }
346
347 static inline int
348 HYPERVISOR_event_channel_op(int cmd, void *arg)
349 {
350         int rc = _hypercall2(int, event_channel_op, cmd, arg);
351         if (unlikely(rc == -ENOSYS)) {
352                 struct evtchn_op op;
353                 op.cmd = cmd;
354                 memcpy(&op.u, arg, sizeof(op.u));
355                 rc = _hypercall1(int, event_channel_op_compat, &op);
356                 memcpy(arg, &op.u, sizeof(op.u));
357         }
358         return rc;
359 }
360
361 static inline int
362 HYPERVISOR_xen_version(int cmd, void *arg)
363 {
364         return _hypercall2(int, xen_version, cmd, arg);
365 }
366
367 static inline int
368 HYPERVISOR_console_io(int cmd, int count, char *str)
369 {
370         return _hypercall3(int, console_io, cmd, count, str);
371 }
372
373 static inline int
374 HYPERVISOR_physdev_op(int cmd, void *arg)
375 {
376         int rc = _hypercall2(int, physdev_op, cmd, arg);
377         if (unlikely(rc == -ENOSYS)) {
378                 struct physdev_op op;
379                 op.cmd = cmd;
380                 memcpy(&op.u, arg, sizeof(op.u));
381                 rc = _hypercall1(int, physdev_op_compat, &op);
382                 memcpy(arg, &op.u, sizeof(op.u));
383         }
384         return rc;
385 }
386
387 static inline int
388 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
389 {
390         return _hypercall3(int, grant_table_op, cmd, uop, count);
391 }
392
393 static inline int
394 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
395                                          unsigned long flags, domid_t domid)
396 {
397         if (sizeof(new_val) == sizeof(long))
398                 return _hypercall4(int, update_va_mapping_otherdomain, va,
399                                    new_val.pte, flags, domid);
400         else
401                 return _hypercall5(int, update_va_mapping_otherdomain, va,
402                                    new_val.pte, new_val.pte >> 32,
403                                    flags, domid);
404 }
405
406 static inline int
407 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
408 {
409         return _hypercall2(int, vm_assist, cmd, type);
410 }
411
412 static inline int
413 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
414 {
415         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
416 }
417
418 #ifdef CONFIG_X86_64
419 static inline int
420 HYPERVISOR_set_segment_base(int reg, unsigned long value)
421 {
422         return _hypercall2(int, set_segment_base, reg, value);
423 }
424 #endif
425
426 static inline int
427 HYPERVISOR_suspend(unsigned long start_info_mfn)
428 {
429         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
430
431         /*
432          * For a PV guest the tools require that the start_info mfn be
433          * present in rdx/edx when the hypercall is made. Per the
434          * hypercall calling convention this is the third hypercall
435          * argument, which is start_info_mfn here.
436          */
437         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
438 }
439
440 static inline int
441 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
442 {
443         return _hypercall2(int, nmi_op, op, arg);
444 }
445
446 static inline unsigned long __must_check
447 HYPERVISOR_hvm_op(int op, void *arg)
448 {
449        return _hypercall2(unsigned long, hvm_op, op, arg);
450 }
451
452 static inline int
453 HYPERVISOR_tmem_op(
454         struct tmem_op *op)
455 {
456         return _hypercall1(int, tmem_op, op);
457 }
458
459 static inline void
460 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
461 {
462         mcl->op = __HYPERVISOR_fpu_taskswitch;
463         mcl->args[0] = set;
464
465         trace_xen_mc_entry(mcl, 1);
466 }
467
468 static inline void
469 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
470                         pte_t new_val, unsigned long flags)
471 {
472         mcl->op = __HYPERVISOR_update_va_mapping;
473         mcl->args[0] = va;
474         if (sizeof(new_val) == sizeof(long)) {
475                 mcl->args[1] = new_val.pte;
476                 mcl->args[2] = flags;
477         } else {
478                 mcl->args[1] = new_val.pte;
479                 mcl->args[2] = new_val.pte >> 32;
480                 mcl->args[3] = flags;
481         }
482
483         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
484 }
485
486 static inline void
487 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
488                      void *uop, unsigned int count)
489 {
490         mcl->op = __HYPERVISOR_grant_table_op;
491         mcl->args[0] = cmd;
492         mcl->args[1] = (unsigned long)uop;
493         mcl->args[2] = count;
494
495         trace_xen_mc_entry(mcl, 3);
496 }
497
498 static inline void
499 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
500                                     pte_t new_val, unsigned long flags,
501                                     domid_t domid)
502 {
503         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
504         mcl->args[0] = va;
505         if (sizeof(new_val) == sizeof(long)) {
506                 mcl->args[1] = new_val.pte;
507                 mcl->args[2] = flags;
508                 mcl->args[3] = domid;
509         } else {
510                 mcl->args[1] = new_val.pte;
511                 mcl->args[2] = new_val.pte >> 32;
512                 mcl->args[3] = flags;
513                 mcl->args[4] = domid;
514         }
515
516         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
517 }
518
519 static inline void
520 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
521                         struct desc_struct desc)
522 {
523         mcl->op = __HYPERVISOR_update_descriptor;
524         if (sizeof(maddr) == sizeof(long)) {
525                 mcl->args[0] = maddr;
526                 mcl->args[1] = *(unsigned long *)&desc;
527         } else {
528                 mcl->args[0] = maddr;
529                 mcl->args[1] = maddr >> 32;
530                 mcl->args[2] = desc.a;
531                 mcl->args[3] = desc.b;
532         }
533
534         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
535 }
536
537 static inline void
538 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
539 {
540         mcl->op = __HYPERVISOR_memory_op;
541         mcl->args[0] = cmd;
542         mcl->args[1] = (unsigned long)arg;
543
544         trace_xen_mc_entry(mcl, 2);
545 }
546
547 static inline void
548 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
549                  int count, int *success_count, domid_t domid)
550 {
551         mcl->op = __HYPERVISOR_mmu_update;
552         mcl->args[0] = (unsigned long)req;
553         mcl->args[1] = count;
554         mcl->args[2] = (unsigned long)success_count;
555         mcl->args[3] = domid;
556
557         trace_xen_mc_entry(mcl, 4);
558 }
559
560 static inline void
561 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
562                 int *success_count, domid_t domid)
563 {
564         mcl->op = __HYPERVISOR_mmuext_op;
565         mcl->args[0] = (unsigned long)op;
566         mcl->args[1] = count;
567         mcl->args[2] = (unsigned long)success_count;
568         mcl->args[3] = domid;
569
570         trace_xen_mc_entry(mcl, 4);
571 }
572
573 static inline void
574 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
575 {
576         mcl->op = __HYPERVISOR_set_gdt;
577         mcl->args[0] = (unsigned long)frames;
578         mcl->args[1] = entries;
579
580         trace_xen_mc_entry(mcl, 2);
581 }
582
583 static inline void
584 MULTI_stack_switch(struct multicall_entry *mcl,
585                    unsigned long ss, unsigned long esp)
586 {
587         mcl->op = __HYPERVISOR_stack_switch;
588         mcl->args[0] = ss;
589         mcl->args[1] = esp;
590
591         trace_xen_mc_entry(mcl, 2);
592 }
593
594 #endif /* _ASM_X86_XEN_HYPERCALL_H */