/arch/x86/include/asm/xen/hypercall.h
C Header | 535 lines | 417 code | 56 blank | 62 comment | 19 complexity | 41732bb8126c57d2e2a3ec870b480629 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
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
49/*
50 * The hypercall asms have to meet several constraints:
51 * - Work on 32- and 64-bit.
52 * The two architectures put their arguments in different sets of
53 * registers.
54 *
55 * - Work around asm syntax quirks
56 * It isn't possible to specify one of the rNN registers in a
57 * constraint, so we use explicit register variables to get the
58 * args into the right place.
59 *
60 * - Mark all registers as potentially clobbered
61 * Even unused parameters can be clobbered by the hypervisor, so we
62 * need to make sure gcc knows it.
63 *
64 * - Avoid compiler bugs.
65 * This is the tricky part. Because x86_32 has such a constrained
66 * register set, gcc versions below 4.3 have trouble generating
67 * code when all the arg registers and memory are trashed by the
68 * asm. There are syntactically simpler ways of achieving the
69 * semantics below, but they cause the compiler to crash.
70 *
71 * The only combination I found which works is:
72 * - assign the __argX variables first
73 * - list all actually used parameters as "+r" (__argX)
74 * - clobber the rest
75 *
76 * The result certainly isn't pretty, and it really shows up cpp's
77 * weakness as as macro language. Sorry. (But let's just give thanks
78 * there aren't more than 5 arguments...)
79 */
80
81extern struct { char _entry[32]; } hypercall_page[];
82
83#define __HYPERCALL "call hypercall_page+%c[offset]"
84#define __HYPERCALL_ENTRY(x) \
85 [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
86
87#ifdef CONFIG_X86_32
88#define __HYPERCALL_RETREG "eax"
89#define __HYPERCALL_ARG1REG "ebx"
90#define __HYPERCALL_ARG2REG "ecx"
91#define __HYPERCALL_ARG3REG "edx"
92#define __HYPERCALL_ARG4REG "esi"
93#define __HYPERCALL_ARG5REG "edi"
94#else
95#define __HYPERCALL_RETREG "rax"
96#define __HYPERCALL_ARG1REG "rdi"
97#define __HYPERCALL_ARG2REG "rsi"
98#define __HYPERCALL_ARG3REG "rdx"
99#define __HYPERCALL_ARG4REG "r10"
100#define __HYPERCALL_ARG5REG "r8"
101#endif
102
103#define __HYPERCALL_DECLS \
104 register unsigned long __res asm(__HYPERCALL_RETREG); \
105 register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
106 register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
107 register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
108 register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
109 register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
110
111#define __HYPERCALL_0PARAM "=r" (__res)
112#define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1)
113#define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2)
114#define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3)
115#define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4)
116#define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5)
117
118#define __HYPERCALL_0ARG()
119#define __HYPERCALL_1ARG(a1) \
120 __HYPERCALL_0ARG() __arg1 = (unsigned long)(a1);
121#define __HYPERCALL_2ARG(a1,a2) \
122 __HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2);
123#define __HYPERCALL_3ARG(a1,a2,a3) \
124 __HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3);
125#define __HYPERCALL_4ARG(a1,a2,a3,a4) \
126 __HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4);
127#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \
128 __HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5);
129
130#define __HYPERCALL_CLOBBER5 "memory"
131#define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
132#define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
133#define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
134#define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
135#define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
136
137#define _hypercall0(type, name) \
138({ \
139 __HYPERCALL_DECLS; \
140 __HYPERCALL_0ARG(); \
141 asm volatile (__HYPERCALL \
142 : __HYPERCALL_0PARAM \
143 : __HYPERCALL_ENTRY(name) \
144 : __HYPERCALL_CLOBBER0); \
145 (type)__res; \
146})
147
148#define _hypercall1(type, name, a1) \
149({ \
150 __HYPERCALL_DECLS; \
151 __HYPERCALL_1ARG(a1); \
152 asm volatile (__HYPERCALL \
153 : __HYPERCALL_1PARAM \
154 : __HYPERCALL_ENTRY(name) \
155 : __HYPERCALL_CLOBBER1); \
156 (type)__res; \
157})
158
159#define _hypercall2(type, name, a1, a2) \
160({ \
161 __HYPERCALL_DECLS; \
162 __HYPERCALL_2ARG(a1, a2); \
163 asm volatile (__HYPERCALL \
164 : __HYPERCALL_2PARAM \
165 : __HYPERCALL_ENTRY(name) \
166 : __HYPERCALL_CLOBBER2); \
167 (type)__res; \
168})
169
170#define _hypercall3(type, name, a1, a2, a3) \
171({ \
172 __HYPERCALL_DECLS; \
173 __HYPERCALL_3ARG(a1, a2, a3); \
174 asm volatile (__HYPERCALL \
175 : __HYPERCALL_3PARAM \
176 : __HYPERCALL_ENTRY(name) \
177 : __HYPERCALL_CLOBBER3); \
178 (type)__res; \
179})
180
181#define _hypercall4(type, name, a1, a2, a3, a4) \
182({ \
183 __HYPERCALL_DECLS; \
184 __HYPERCALL_4ARG(a1, a2, a3, a4); \
185 asm volatile (__HYPERCALL \
186 : __HYPERCALL_4PARAM \
187 : __HYPERCALL_ENTRY(name) \
188 : __HYPERCALL_CLOBBER4); \
189 (type)__res; \
190})
191
192#define _hypercall5(type, name, a1, a2, a3, a4, a5) \
193({ \
194 __HYPERCALL_DECLS; \
195 __HYPERCALL_5ARG(a1, a2, a3, a4, a5); \
196 asm volatile (__HYPERCALL \
197 : __HYPERCALL_5PARAM \
198 : __HYPERCALL_ENTRY(name) \
199 : __HYPERCALL_CLOBBER5); \
200 (type)__res; \
201})
202
203static inline int
204HYPERVISOR_set_trap_table(struct trap_info *table)
205{
206 return _hypercall1(int, set_trap_table, table);
207}
208
209static inline int
210HYPERVISOR_mmu_update(struct mmu_update *req, int count,
211 int *success_count, domid_t domid)
212{
213 return _hypercall4(int, mmu_update, req, count, success_count, domid);
214}
215
216static inline int
217HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
218 int *success_count, domid_t domid)
219{
220 return _hypercall4(int, mmuext_op, op, count, success_count, domid);
221}
222
223static inline int
224HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
225{
226 return _hypercall2(int, set_gdt, frame_list, entries);
227}
228
229static inline int
230HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
231{
232 return _hypercall2(int, stack_switch, ss, esp);
233}
234
235#ifdef CONFIG_X86_32
236static inline int
237HYPERVISOR_set_callbacks(unsigned long event_selector,
238 unsigned long event_address,
239 unsigned long failsafe_selector,
240 unsigned long failsafe_address)
241{
242 return _hypercall4(int, set_callbacks,
243 event_selector, event_address,
244 failsafe_selector, failsafe_address);
245}
246#else /* CONFIG_X86_64 */
247static inline int
248HYPERVISOR_set_callbacks(unsigned long event_address,
249 unsigned long failsafe_address,
250 unsigned long syscall_address)
251{
252 return _hypercall3(int, set_callbacks,
253 event_address, failsafe_address,
254 syscall_address);
255}
256#endif /* CONFIG_X86_{32,64} */
257
258static inline int
259HYPERVISOR_callback_op(int cmd, void *arg)
260{
261 return _hypercall2(int, callback_op, cmd, arg);
262}
263
264static inline int
265HYPERVISOR_fpu_taskswitch(int set)
266{
267 return _hypercall1(int, fpu_taskswitch, set);
268}
269
270static inline int
271HYPERVISOR_sched_op(int cmd, void *arg)
272{
273 return _hypercall2(int, sched_op_new, cmd, arg);
274}
275
276static inline long
277HYPERVISOR_set_timer_op(u64 timeout)
278{
279 unsigned long timeout_hi = (unsigned long)(timeout>>32);
280 unsigned long timeout_lo = (unsigned long)timeout;
281 return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
282}
283
284static inline int
285HYPERVISOR_set_debugreg(int reg, unsigned long value)
286{
287 return _hypercall2(int, set_debugreg, reg, value);
288}
289
290static inline unsigned long
291HYPERVISOR_get_debugreg(int reg)
292{
293 return _hypercall1(unsigned long, get_debugreg, reg);
294}
295
296static inline int
297HYPERVISOR_update_descriptor(u64 ma, u64 desc)
298{
299 if (sizeof(u64) == sizeof(long))
300 return _hypercall2(int, update_descriptor, ma, desc);
301 return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
302}
303
304static inline int
305HYPERVISOR_memory_op(unsigned int cmd, void *arg)
306{
307 return _hypercall2(int, memory_op, cmd, arg);
308}
309
310static inline int
311HYPERVISOR_multicall(void *call_list, int nr_calls)
312{
313 return _hypercall2(int, multicall, call_list, nr_calls);
314}
315
316static inline int
317HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
318 unsigned long flags)
319{
320 if (sizeof(new_val) == sizeof(long))
321 return _hypercall3(int, update_va_mapping, va,
322 new_val.pte, flags);
323 else
324 return _hypercall4(int, update_va_mapping, va,
325 new_val.pte, new_val.pte >> 32, flags);
326}
327
328static inline int
329HYPERVISOR_event_channel_op(int cmd, void *arg)
330{
331 int rc = _hypercall2(int, event_channel_op, cmd, arg);
332 if (unlikely(rc == -ENOSYS)) {
333 struct evtchn_op op;
334 op.cmd = cmd;
335 memcpy(&op.u, arg, sizeof(op.u));
336 rc = _hypercall1(int, event_channel_op_compat, &op);
337 memcpy(arg, &op.u, sizeof(op.u));
338 }
339 return rc;
340}
341
342static inline int
343HYPERVISOR_xen_version(int cmd, void *arg)
344{
345 return _hypercall2(int, xen_version, cmd, arg);
346}
347
348static inline int
349HYPERVISOR_console_io(int cmd, int count, char *str)
350{
351 return _hypercall3(int, console_io, cmd, count, str);
352}
353
354static inline int
355HYPERVISOR_physdev_op(int cmd, void *arg)
356{
357 int rc = _hypercall2(int, physdev_op, cmd, arg);
358 if (unlikely(rc == -ENOSYS)) {
359 struct physdev_op op;
360 op.cmd = cmd;
361 memcpy(&op.u, arg, sizeof(op.u));
362 rc = _hypercall1(int, physdev_op_compat, &op);
363 memcpy(arg, &op.u, sizeof(op.u));
364 }
365 return rc;
366}
367
368static inline int
369HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
370{
371 return _hypercall3(int, grant_table_op, cmd, uop, count);
372}
373
374static inline int
375HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
376 unsigned long flags, domid_t domid)
377{
378 if (sizeof(new_val) == sizeof(long))
379 return _hypercall4(int, update_va_mapping_otherdomain, va,
380 new_val.pte, flags, domid);
381 else
382 return _hypercall5(int, update_va_mapping_otherdomain, va,
383 new_val.pte, new_val.pte >> 32,
384 flags, domid);
385}
386
387static inline int
388HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
389{
390 return _hypercall2(int, vm_assist, cmd, type);
391}
392
393static inline int
394HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
395{
396 return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
397}
398
399#ifdef CONFIG_X86_64
400static inline int
401HYPERVISOR_set_segment_base(int reg, unsigned long value)
402{
403 return _hypercall2(int, set_segment_base, reg, value);
404}
405#endif
406
407static inline int
408HYPERVISOR_suspend(unsigned long srec)
409{
410 return _hypercall3(int, sched_op, SCHEDOP_shutdown,
411 SHUTDOWN_suspend, srec);
412}
413
414static inline int
415HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
416{
417 return _hypercall2(int, nmi_op, op, arg);
418}
419
420static inline void
421MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
422{
423 mcl->op = __HYPERVISOR_fpu_taskswitch;
424 mcl->args[0] = set;
425}
426
427static inline void
428MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
429 pte_t new_val, unsigned long flags)
430{
431 mcl->op = __HYPERVISOR_update_va_mapping;
432 mcl->args[0] = va;
433 if (sizeof(new_val) == sizeof(long)) {
434 mcl->args[1] = new_val.pte;
435 mcl->args[2] = flags;
436 } else {
437 mcl->args[1] = new_val.pte;
438 mcl->args[2] = new_val.pte >> 32;
439 mcl->args[3] = flags;
440 }
441}
442
443static inline void
444MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
445 void *uop, unsigned int count)
446{
447 mcl->op = __HYPERVISOR_grant_table_op;
448 mcl->args[0] = cmd;
449 mcl->args[1] = (unsigned long)uop;
450 mcl->args[2] = count;
451}
452
453static inline void
454MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
455 pte_t new_val, unsigned long flags,
456 domid_t domid)
457{
458 mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
459 mcl->args[0] = va;
460 if (sizeof(new_val) == sizeof(long)) {
461 mcl->args[1] = new_val.pte;
462 mcl->args[2] = flags;
463 mcl->args[3] = domid;
464 } else {
465 mcl->args[1] = new_val.pte;
466 mcl->args[2] = new_val.pte >> 32;
467 mcl->args[3] = flags;
468 mcl->args[4] = domid;
469 }
470}
471
472static inline void
473MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
474 struct desc_struct desc)
475{
476 mcl->op = __HYPERVISOR_update_descriptor;
477 if (sizeof(maddr) == sizeof(long)) {
478 mcl->args[0] = maddr;
479 mcl->args[1] = *(unsigned long *)&desc;
480 } else {
481 mcl->args[0] = maddr;
482 mcl->args[1] = maddr >> 32;
483 mcl->args[2] = desc.a;
484 mcl->args[3] = desc.b;
485 }
486}
487
488static inline void
489MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
490{
491 mcl->op = __HYPERVISOR_memory_op;
492 mcl->args[0] = cmd;
493 mcl->args[1] = (unsigned long)arg;
494}
495
496static inline void
497MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
498 int count, int *success_count, domid_t domid)
499{
500 mcl->op = __HYPERVISOR_mmu_update;
501 mcl->args[0] = (unsigned long)req;
502 mcl->args[1] = count;
503 mcl->args[2] = (unsigned long)success_count;
504 mcl->args[3] = domid;
505}
506
507static inline void
508MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
509 int *success_count, domid_t domid)
510{
511 mcl->op = __HYPERVISOR_mmuext_op;
512 mcl->args[0] = (unsigned long)op;
513 mcl->args[1] = count;
514 mcl->args[2] = (unsigned long)success_count;
515 mcl->args[3] = domid;
516}
517
518static inline void
519MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
520{
521 mcl->op = __HYPERVISOR_set_gdt;
522 mcl->args[0] = (unsigned long)frames;
523 mcl->args[1] = entries;
524}
525
526static inline void
527MULTI_stack_switch(struct multicall_entry *mcl,
528 unsigned long ss, unsigned long esp)
529{
530 mcl->op = __HYPERVISOR_stack_switch;
531 mcl->args[0] = ss;
532 mcl->args[1] = esp;
533}
534
535#endif /* _ASM_X86_XEN_HYPERCALL_H */