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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 <asm/page.h>
43 #include <asm/pgtable.h>
44
45 #include <xen/interface/xen.h>
46 #include <xen/interface/sched.h>
47 #include <xen/interface/physdev.h>
48 #include <xen/interface/platform.h>
49
50 /*
51  * The hypercall asms have to meet several constraints:
52  * - Work on 32- and 64-bit.
53  *    The two architectures put their arguments in different sets of
54  *    registers.
55  *
56  * - Work around asm syntax quirks
57  *    It isn't possible to specify one of the rNN registers in a
58  *    constraint, so we use explicit register variables to get the
59  *    args into the right place.
60  *
61  * - Mark all registers as potentially clobbered
62  *    Even unused parameters can be clobbered by the hypervisor, so we
63  *    need to make sure gcc knows it.
64  *
65  * - Avoid compiler bugs.
66  *    This is the tricky part.  Because x86_32 has such a constrained
67  *    register set, gcc versions below 4.3 have trouble generating
68  *    code when all the arg registers and memory are trashed by the
69  *    asm.  There are syntactically simpler ways of achieving the
70  *    semantics below, but they cause the compiler to crash.
71  *
72  *    The only combination I found which works is:
73  *     - assign the __argX variables first
74  *     - list all actually used parameters as "+r" (__argX)
75  *     - clobber the rest
76  *
77  * The result certainly isn't pretty, and it really shows up cpp's
78  * weakness as as macro language.  Sorry.  (But let's just give thanks
79  * there aren't more than 5 arguments...)
80  */
81
82 extern struct { char _entry[32]; } hypercall_page[];
83
84 #define __HYPERCALL             "call hypercall_page+%c[offset]"
85 #define __HYPERCALL_ENTRY(x)                                            \
86         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
87
88 #ifdef CONFIG_X86_32
89 #define __HYPERCALL_RETREG      "eax"
90 #define __HYPERCALL_ARG1REG     "ebx"
91 #define __HYPERCALL_ARG2REG     "ecx"
92 #define __HYPERCALL_ARG3REG     "edx"
93 #define __HYPERCALL_ARG4REG     "esi"
94 #define __HYPERCALL_ARG5REG     "edi"
95 #else
96 #define __HYPERCALL_RETREG      "rax"
97 #define __HYPERCALL_ARG1REG     "rdi"
98 #define __HYPERCALL_ARG2REG     "rsi"
99 #define __HYPERCALL_ARG3REG     "rdx"
100 #define __HYPERCALL_ARG4REG     "r10"
101 #define __HYPERCALL_ARG5REG     "r8"
102 #endif
103
104 #define __HYPERCALL_DECLS                                               \
105         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
106         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
107         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
108         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
109         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
110         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
111
112 #define __HYPERCALL_0PARAM      "=r" (__res)
113 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
114 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
115 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
116 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
117 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
118
119 #define __HYPERCALL_0ARG()
120 #define __HYPERCALL_1ARG(a1)                                            \
121         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
122 #define __HYPERCALL_2ARG(a1,a2)                                         \
123         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
124 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
125         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
126 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
127         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
128 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
129         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
130
131 #define __HYPERCALL_CLOBBER5    "memory"
132 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
133 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
134 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
135 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
136 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
137
138 #define _hypercall0(type, name)                                         \
139 ({                                                                      \
140         __HYPERCALL_DECLS;                                              \
141         __HYPERCALL_0ARG();                                             \
142         asm volatile (__HYPERCALL                                       \
143                       : __HYPERCALL_0PARAM                              \
144                       : __HYPERCALL_ENTRY(name)                         \
145                       : __HYPERCALL_CLOBBER0);                          \
146         (type)__res;                                                    \
147 })
148
149 #define _hypercall1(type, name, a1)                                     \
150 ({                                                                      \
151         __HYPERCALL_DECLS;                                              \
152         __HYPERCALL_1ARG(a1);                                           \
153         asm volatile (__HYPERCALL                                       \
154                       : __HYPERCALL_1PARAM                              \
155                       : __HYPERCALL_ENTRY(name)                         \
156                       : __HYPERCALL_CLOBBER1);                          \
157         (type)__res;                                                    \
158 })
159
160 #define _hypercall2(type, name, a1, a2)                                 \
161 ({                                                                      \
162         __HYPERCALL_DECLS;                                              \
163         __HYPERCALL_2ARG(a1, a2);                                       \
164         asm volatile (__HYPERCALL                                       \
165                       : __HYPERCALL_2PARAM                              \
166                       : __HYPERCALL_ENTRY(name)                         \
167                       : __HYPERCALL_CLOBBER2);                          \
168         (type)__res;                                                    \
169 })
170
171 #define _hypercall3(type, name, a1, a2, a3)                             \
172 ({                                                                      \
173         __HYPERCALL_DECLS;                                              \
174         __HYPERCALL_3ARG(a1, a2, a3);                                   \
175         asm volatile (__HYPERCALL                                       \
176                       : __HYPERCALL_3PARAM                              \
177                       : __HYPERCALL_ENTRY(name)                         \
178                       : __HYPERCALL_CLOBBER3);                          \
179         (type)__res;                                                    \
180 })
181
182 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
183 ({                                                                      \
184         __HYPERCALL_DECLS;                                              \
185         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
186         asm volatile (__HYPERCALL                                       \
187                       : __HYPERCALL_4PARAM                              \
188                       : __HYPERCALL_ENTRY(name)                         \
189                       : __HYPERCALL_CLOBBER4);                          \
190         (type)__res;                                                    \
191 })
192
193 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
194 ({                                                                      \
195         __HYPERCALL_DECLS;                                              \
196         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
197         asm volatile (__HYPERCALL                                       \
198                       : __HYPERCALL_5PARAM                              \
199                       : __HYPERCALL_ENTRY(name)                         \
200                       : __HYPERCALL_CLOBBER5);                          \
201         (type)__res;                                                    \
202 })
203
204 static inline long
205 privcmd_call(unsigned call,
206              unsigned long a1, unsigned long a2,
207              unsigned long a3, unsigned long a4,
208              unsigned long a5)
209 {
210         __HYPERCALL_DECLS;
211         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
212
213         asm volatile("call *%[call]"
214                      : __HYPERCALL_5PARAM
215                      : [call] "a" (&hypercall_page[call])
216                      : __HYPERCALL_CLOBBER5);
217
218         return (long)__res;
219 }
220
221 static inline int
222 HYPERVISOR_set_trap_table(struct trap_info *table)
223 {
224         return _hypercall1(int, set_trap_table, table);
225 }
226
227 static inline int
228 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
229                       int *success_count, domid_t domid)
230 {
231         return _hypercall4(int, mmu_update, req, count, success_count, domid);
232 }
233
234 static inline int
235 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
236                      int *success_count, domid_t domid)
237 {
238         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
239 }
240
241 static inline int
242 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
243 {
244         return _hypercall2(int, set_gdt, frame_list, entries);
245 }
246
247 static inline int
248 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
249 {
250         return _hypercall2(int, stack_switch, ss, esp);
251 }
252
253 #ifdef CONFIG_X86_32
254 static inline int
255 HYPERVISOR_set_callbacks(unsigned long event_selector,
256                          unsigned long event_address,
257                          unsigned long failsafe_selector,
258                          unsigned long failsafe_address)
259 {
260         return _hypercall4(int, set_callbacks,
261                            event_selector, event_address,
262                            failsafe_selector, failsafe_address);
263 }
264 #else  /* CONFIG_X86_64 */
265 static inline int
266 HYPERVISOR_set_callbacks(unsigned long event_address,
267                         unsigned long failsafe_address,
268                         unsigned long syscall_address)
269 {
270         return _hypercall3(int, set_callbacks,
271                            event_address, failsafe_address,
272                            syscall_address);
273 }
274 #endif  /* CONFIG_X86_{32,64} */
275
276 static inline int
277 HYPERVISOR_callback_op(int cmd, void *arg)
278 {
279         return _hypercall2(int, callback_op, cmd, arg);
280 }
281
282 static inline int
283 HYPERVISOR_fpu_taskswitch(int set)
284 {
285         return _hypercall1(int, fpu_taskswitch, set);
286 }
287
288 static inline int
289 HYPERVISOR_sched_op(int cmd, void *arg)
290 {
291         return _hypercall2(int, sched_op, cmd, arg);
292 }
293
294 static inline long
295 HYPERVISOR_set_timer_op(u64 timeout)
296 {
297         unsigned long timeout_hi = (unsigned long)(timeout>>32);
298         unsigned long timeout_lo = (unsigned long)timeout;
299         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
300 }
301
302 static inline int
303 HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
304 {
305         platform_op->interface_version = XENPF_INTERFACE_VERSION;
306         return _hypercall1(int, dom0_op, platform_op);
307 }
308
309 static inline int
310 HYPERVISOR_set_debugreg(int reg, unsigned long value)
311 {
312         return _hypercall2(int, set_debugreg, reg, value);
313 }
314
315 static inline unsigned long
316 HYPERVISOR_get_debugreg(int reg)
317 {
318         return _hypercall1(unsigned long, get_debugreg, reg);
319 }
320
321 static inline int
322 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
323 {
324         if (sizeof(u64) == sizeof(long))
325                 return _hypercall2(int, update_descriptor, ma, desc);
326         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
327 }
328
329 static inline int
330 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
331 {
332         return _hypercall2(int, memory_op, cmd, arg);
333 }
334
335 static inline int
336 HYPERVISOR_multicall(void *call_list, int nr_calls)
337 {
338         return _hypercall2(int, multicall, call_list, nr_calls);
339 }
340
341 static inline int
342 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
343                              unsigned long flags)
344 {
345         if (sizeof(new_val) == sizeof(long))
346                 return _hypercall3(int, update_va_mapping, va,
347                                    new_val.pte, flags);
348         else
349                 return _hypercall4(int, update_va_mapping, va,
350                                    new_val.pte, new_val.pte >> 32, flags);
351 }
352
353 static inline int
354 HYPERVISOR_event_channel_op(int cmd, void *arg)
355 {
356         int rc = _hypercall2(int, event_channel_op, cmd, arg);
357         if (unlikely(rc == -ENOSYS)) {
358                 struct evtchn_op op;
359                 op.cmd = cmd;
360                 memcpy(&op.u, arg, sizeof(op.u));
361                 rc = _hypercall1(int, event_channel_op_compat, &op);
362                 memcpy(arg, &op.u, sizeof(op.u));
363         }
364         return rc;
365 }
366
367 static inline int
368 HYPERVISOR_xen_version(int cmd, void *arg)
369 {
370         return _hypercall2(int, xen_version, cmd, arg);
371 }
372
373 static inline int
374 HYPERVISOR_console_io(int cmd, int count, char *str)
375 {
376         return _hypercall3(int, console_io, cmd, count, str);
377 }
378
379 static inline int
380 HYPERVISOR_physdev_op(int cmd, void *arg)
381 {
382         int rc = _hypercall2(int, physdev_op, cmd, arg);
383         if (unlikely(rc == -ENOSYS)) {
384                 struct physdev_op op;
385                 op.cmd = cmd;
386                 memcpy(&op.u, arg, sizeof(op.u));
387                 rc = _hypercall1(int, physdev_op_compat, &op);
388                 memcpy(arg, &op.u, sizeof(op.u));
389         }
390         return rc;
391 }
392
393 static inline int
394 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
395 {
396         return _hypercall3(int, grant_table_op, cmd, uop, count);
397 }
398
399 static inline int
400 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
401                                          unsigned long flags, domid_t domid)
402 {
403         if (sizeof(new_val) == sizeof(long))
404                 return _hypercall4(int, update_va_mapping_otherdomain, va,
405                                    new_val.pte, flags, domid);
406         else
407                 return _hypercall5(int, update_va_mapping_otherdomain, va,
408                                    new_val.pte, new_val.pte >> 32,
409                                    flags, domid);
410 }
411
412 static inline int
413 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
414 {
415         return _hypercall2(int, vm_assist, cmd, type);
416 }
417
418 static inline int
419 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
420 {
421         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
422 }
423
424 #ifdef CONFIG_X86_64
425 static inline int
426 HYPERVISOR_set_segment_base(int reg, unsigned long value)
427 {
428         return _hypercall2(int, set_segment_base, reg, value);
429 }
430 #endif
431
432 static inline int
433 HYPERVISOR_suspend(unsigned long start_info_mfn)
434 {
435         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
436
437         /*
438          * For a PV guest the tools require that the start_info mfn be
439          * present in rdx/edx when the hypercall is made. Per the
440          * hypercall calling convention this is the third hypercall
441          * argument, which is start_info_mfn here.
442          */
443         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
444 }
445
446 static inline int
447 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
448 {
449         return _hypercall2(int, nmi_op, op, arg);
450 }
451
452 static inline unsigned long __must_check
453 HYPERVISOR_hvm_op(int op, void *arg)
454 {
455        return _hypercall2(unsigned long, hvm_op, op, arg);
456 }
457
458 static inline int
459 HYPERVISOR_tmem_op(
460         struct tmem_op *op)
461 {
462         return _hypercall1(int, tmem_op, op);
463 }
464
465 static inline void
466 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
467 {
468         mcl->op = __HYPERVISOR_fpu_taskswitch;
469         mcl->args[0] = set;
470 }
471
472 static inline void
473 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
474                         pte_t new_val, unsigned long flags)
475 {
476         mcl->op = __HYPERVISOR_update_va_mapping;
477         mcl->args[0] = va;
478         if (sizeof(new_val) == sizeof(long)) {
479                 mcl->args[1] = new_val.pte;
480                 mcl->args[2] = flags;
481         } else {
482                 mcl->args[1] = new_val.pte;
483                 mcl->args[2] = new_val.pte >> 32;
484                 mcl->args[3] = flags;
485         }
486 }
487
488 static inline void
489 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
490                      void *uop, unsigned int count)
491 {
492         mcl->op = __HYPERVISOR_grant_table_op;
493         mcl->args[0] = cmd;
494         mcl->args[1] = (unsigned long)uop;
495         mcl->args[2] = count;
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
517 static inline void
518 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
519                         struct desc_struct desc)
520 {
521         mcl->op = __HYPERVISOR_update_descriptor;
522         if (sizeof(maddr) == sizeof(long)) {
523                 mcl->args[0] = maddr;
524                 mcl->args[1] = *(unsigned long *)&desc;
525         } else {
526                 mcl->args[0] = maddr;
527                 mcl->args[1] = maddr >> 32;
528                 mcl->args[2] = desc.a;
529                 mcl->args[3] = desc.b;
530         }
531 }
532
533 static inline void
534 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
535 {
536         mcl->op = __HYPERVISOR_memory_op;
537         mcl->args[0] = cmd;
538         mcl->args[1] = (unsigned long)arg;
539 }
540
541 static inline void
542 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
543                  int count, int *success_count, domid_t domid)
544 {
545         mcl->op = __HYPERVISOR_mmu_update;
546         mcl->args[0] = (unsigned long)req;
547         mcl->args[1] = count;
548         mcl->args[2] = (unsigned long)success_count;
549         mcl->args[3] = domid;
550 }
551
552 static inline void
553 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
554                 int *success_count, domid_t domid)
555 {
556         mcl->op = __HYPERVISOR_mmuext_op;
557         mcl->args[0] = (unsigned long)op;
558         mcl->args[1] = count;
559         mcl->args[2] = (unsigned long)success_count;
560         mcl->args[3] = domid;
561 }
562
563 static inline void
564 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
565 {
566         mcl->op = __HYPERVISOR_set_gdt;
567         mcl->args[0] = (unsigned long)frames;
568         mcl->args[1] = entries;
569 }
570
571 static inline void
572 MULTI_stack_switch(struct multicall_entry *mcl,
573                    unsigned long ss, unsigned long esp)
574 {
575         mcl->op = __HYPERVISOR_stack_switch;
576         mcl->args[0] = ss;
577         mcl->args[1] = esp;
578 }
579
580 #endif /* _ASM_X86_XEN_HYPERCALL_H */