ia64/linux-2.6.18-xen.hg

view include/xen/public/xenbus.h @ 876:bd7e30b58d12

xenbus: Allow lazy init in case xenstored runs in a separate minios domain.

Here's an explanation of the states:

It starts out in XENBUS_XSD_UNCOMMITTED.

As the master xenbus (the one local to xenstored), it will receive an
mmap from xenstore, putting it in XENBUS_XSD_LOCAL_INIT. This enables
the wake_waiting IRQ, which will put it in XENBUS_XSD_LOCAL_READY.

Alternatively, as a slave xenbus, it will receive an ioctl from the
xenstore domain builder, putting it in XENBUS_XSD_FOREIGN_INIT. This
enables the wake_waiting IRQ, which will put it in
XENBUS_XSD_FOREIGN_READY.

DomU's are immediately initialized to XENBUS_XSD_FOREIGN_READY.

Signed-off-by: Diego Ongaro <diego.ongaro@citrix.com>
Signed-off-by: Alex Zeffertt <alex.zeffertt@eu.citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue May 19 14:45:50 2009 +0100 (2009-05-19)
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1 /******************************************************************************
2 * xenbus.h
3 *
4 * Interface to /proc/xen/xenbus.
5 *
6 * Copyright (c) 2008, Diego Ongaro <diego.ongaro@citrix.com>
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 */
33 #ifndef __LINUX_PUBLIC_XENBUS_H__
34 #define __LINUX_PUBLIC_XENBUS_H__
36 #include <linux/types.h>
38 #ifndef __user
39 #define __user
40 #endif
42 typedef struct xenbus_alloc {
43 domid_t dom;
44 __u32 port;
45 __u32 grant_ref;
46 } xenbus_alloc_t;
48 /*
49 * @cmd: IOCTL_XENBUS_ALLOC
50 * @arg: &xenbus_alloc_t
51 * Return: 0, or -1 for error
52 */
53 #define IOCTL_XENBUS_ALLOC \
54 _IOC(_IOC_NONE, 'X', 0, sizeof(xenbus_alloc_t))
56 #endif /* __LINUX_PUBLIC_XENBUS_H__ */