1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/******************************************************************************
* kexec.h - Public portion
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Xen port written by:
* - Simon 'Horms' Horman <horms@verge.net.au>
* - Magnus Damm <magnus@valinux.co.jp>
*/
#ifndef _XEN_PUBLIC_KEXEC_H
#define _XEN_PUBLIC_KEXEC_H
/* This file describes the Kexec / Kdump hypercall interface for Xen.
*
* Kexec under vanilla Linux allows a user to reboot the physical machine
* into a new user-specified kernel. The Xen port extends this idea
* to allow rebooting of the machine from dom0. When kexec for dom0
* is used to reboot, both the hypervisor and the domains get replaced
* with some other kernel. It is possible to kexec between vanilla
* Linux and Xen and back again. Xen to Xen works well too.
*
* The hypercall interface for kexec can be divided into three main
* types of hypercall operations:
*
* 1) Range information:
* This is used by the dom0 kernel to ask the hypervisor about various
* address information. This information is needed to allow kexec-tools
* to fill in the ELF headers for /proc/vmcore properly.
*
* 2) Load and unload of images:
* There are no big surprises here, the kexec binary from kexec-tools
* runs in userspace in dom0. The tool loads/unloads data into the
* dom0 kernel such as new kernel, initramfs and hypervisor. When
* loaded the dom0 kernel performs a load hypercall operation, and
* before releasing all page references the dom0 kernel calls unload.
*
* 3) Kexec operation:
* This is used to start a previously loaded kernel.
*/
#include "xen.h"
#if defined(__i386__) || defined(__x86_64__)
#define KEXEC_XEN_NO_PAGES 17
#endif
/*
* Prototype for this hypercall is:
* int kexec_op(int cmd, void *args)
* @cmd == KEXEC_CMD_...
* KEXEC operation to perform
* @args == Operation-specific extra arguments (NULL if none).
*/
/*
* Kexec supports two types of operation:
* - kexec into a regular kernel, very similar to a standard reboot
* - KEXEC_TYPE_DEFAULT is used to specify this type
* - kexec into a special "crash kernel", aka kexec-on-panic
* - KEXEC_TYPE_CRASH is used to specify this type
* - parts of our system may be broken at kexec-on-panic time
* - the code should be kept as simple and self-contained as possible
*/
#define KEXEC_TYPE_DEFAULT 0
#define KEXEC_TYPE_CRASH 1
/* The kexec implementation for Xen allows the user to load two
* types of kernels, KEXEC_TYPE_DEFAULT and KEXEC_TYPE_CRASH.
* All data needed for a kexec reboot is kept in one xen_kexec_image_t
* per "instance". The data mainly consists of machine address lists to pages
* together with destination addresses. The data in xen_kexec_image_t
* is passed to the "code page" which is one page of code that performs
* the final relocations before jumping to the new kernel.
*/
typedef struct xen_kexec_image {
#if defined(__i386__) || defined(__x86_64__)
unsigned long page_list[KEXEC_XEN_NO_PAGES];
#endif
#if defined(__ia64__)
unsigned long reboot_code_buffer;
#endif
unsigned long indirection_page;
unsigned long start_address;
} xen_kexec_image_t;
/*
* Perform kexec having previously loaded a kexec or kdump kernel
* as appropriate.
* type == KEXEC_TYPE_DEFAULT or KEXEC_TYPE_CRASH [in]
*/
#define KEXEC_CMD_kexec 0
typedef struct xen_kexec_exec {
int type;
} xen_kexec_exec_t;
/*
* Load/Unload kernel image for kexec or kdump.
* type == KEXEC_TYPE_DEFAULT or KEXEC_TYPE_CRASH [in]
* image == relocation information for kexec (ignored for unload) [in]
*/
#define KEXEC_CMD_kexec_load 1
#define KEXEC_CMD_kexec_unload 2
typedef struct xen_kexec_load {
int type;
xen_kexec_image_t image;
} xen_kexec_load_t;
#define KEXEC_RANGE_MA_CRASH 0 /* machine address and size of crash area */
#define KEXEC_RANGE_MA_XEN 1 /* machine address and size of Xen itself */
#define KEXEC_RANGE_MA_CPU 2 /* machine address and size of a CPU note */
#define KEXEC_RANGE_MA_XENHEAP 3 /* machine address and size of xenheap
* Note that although this is adjacent
* to Xen it exists in a separate EFI
* region on ia64, and thus needs to be
* inserted into iomem_machine separately */
#define KEXEC_RANGE_MA_BOOT_PARAM 4 /* machine address and size of
* the ia64_boot_param */
#define KEXEC_RANGE_MA_EFI_MEMMAP 5 /* machine address and size of
* of the EFI Memory Map */
#define KEXEC_RANGE_MA_VMCOREINFO 6 /* machine address and size of vmcoreinfo */
/*
* Find the address and size of certain memory areas
* range == KEXEC_RANGE_... [in]
* nr == physical CPU number (starting from 0) if KEXEC_RANGE_MA_CPU [in]
* size == number of bytes reserved in window [out]
* start == address of the first byte in the window [out]
*/
#define KEXEC_CMD_kexec_get_range 3
typedef struct xen_kexec_range {
int range;
int nr;
unsigned long size;
unsigned long start;
} xen_kexec_range_t;
/* vmcoreinfo stuff */
#define VMCOREINFO_BYTES (4096)
#define VMCOREINFO_NOTE_NAME "VMCOREINFO_XEN"
void arch_crash_save_vmcoreinfo(void);
void vmcoreinfo_append_str(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
#define VMCOREINFO_PAGESIZE(value) \
vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
#define VMCOREINFO_SYMBOL(name) \
vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
#define VMCOREINFO_SYMBOL_ALIAS(alias, name) \
vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #alias, (unsigned long)&name)
#define VMCOREINFO_STRUCT_SIZE(name) \
vmcoreinfo_append_str("SIZE(%s)=%zu\n", #name, sizeof(struct name))
#define VMCOREINFO_OFFSET(name, field) \
vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
(unsigned long)offsetof(struct name, field))
#define VMCOREINFO_OFFSET_ALIAS(name, field, alias) \
vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #alias, \
(unsigned long)offsetof(struct name, field))
#endif /* _XEN_PUBLIC_KEXEC_H */
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
