c16067e008
HYPERVISOR_start_info is only available to PV and PVHv1 guests, HVM and PVHv2 guests get this data from HVM parameters that are fetched using a hypercall. Instead provide a set of helper functions that should be used to fetch this data. The helper functions have different implementations depending on whether FreeBSD is running as PVHv1 or HVM/PVHv2 guest type. This helps to cleanup generic Xen code by removing quite a lot of xen_pv_domain and xen_hvm_domain macro usages. Sponsored by: Citrix Systems R&D
372 lines
12 KiB
C
372 lines
12 KiB
C
/******************************************************************************
|
|
* xenstorevar.h
|
|
*
|
|
* Method declarations and structures for accessing the XenStore.h
|
|
*
|
|
* Copyright (C) 2005 Rusty Russell, IBM Corporation
|
|
* Copyright (C) 2005 XenSource Ltd.
|
|
* Copyright (C) 2009,2010 Spectra Logic Corporation
|
|
*
|
|
* This file may be distributed separately from the Linux kernel, or
|
|
* incorporated into other software packages, subject to the following license:
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this source file (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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _XEN_XENSTORE_XENSTOREVAR_H
|
|
#define _XEN_XENSTORE_XENSTOREVAR_H
|
|
|
|
#include <sys/queue.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/sbuf.h>
|
|
|
|
#include <machine/stdarg.h>
|
|
|
|
#include <xen/xen-os.h>
|
|
#include <xen/interface/grant_table.h>
|
|
#include <xen/interface/io/xenbus.h>
|
|
#include <xen/interface/io/xs_wire.h>
|
|
|
|
#include "xenbus_if.h"
|
|
|
|
/* XenStore allocations including XenStore data returned to clients. */
|
|
MALLOC_DECLARE(M_XENSTORE);
|
|
|
|
struct xs_watch;
|
|
|
|
typedef void (xs_watch_cb_t)(struct xs_watch *, const char **vec,
|
|
unsigned int len);
|
|
|
|
/* Register callback to watch subtree (node) in the XenStore. */
|
|
struct xs_watch
|
|
{
|
|
LIST_ENTRY(xs_watch) list;
|
|
|
|
/* Path being watched. */
|
|
char *node;
|
|
|
|
/* Callback (executed in a process context with no locks held). */
|
|
xs_watch_cb_t *callback;
|
|
|
|
/* Callback client data untouched by the XenStore watch mechanism. */
|
|
uintptr_t callback_data;
|
|
};
|
|
LIST_HEAD(xs_watch_list, xs_watch);
|
|
|
|
typedef int (*xs_event_handler_t)(void *);
|
|
|
|
struct xs_transaction
|
|
{
|
|
uint32_t id;
|
|
};
|
|
|
|
#define XST_NIL ((struct xs_transaction) { 0 })
|
|
|
|
/**
|
|
* Check if Xenstore is initialized.
|
|
*
|
|
* \return True if initialized, false otherwise.
|
|
*/
|
|
bool xs_initialized(void);
|
|
|
|
/**
|
|
* Return xenstore event channel port.
|
|
*
|
|
* \return event channel port.
|
|
*/
|
|
evtchn_port_t xs_evtchn(void);
|
|
|
|
/**
|
|
* Return xenstore page physical memory address.
|
|
*
|
|
* \return xenstore page physical address.
|
|
*/
|
|
vm_paddr_t xs_address(void);
|
|
|
|
/**
|
|
* Fetch the contents of a directory in the XenStore.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the path to read.
|
|
* \param node The basename of the path to read.
|
|
* \param num The returned number of directory entries.
|
|
* \param result An array of directory entry strings.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*
|
|
* \note The results buffer is malloced and should be free'd by the
|
|
* caller with 'free(*result, M_XENSTORE)'.
|
|
*/
|
|
int xs_directory(struct xs_transaction t, const char *dir,
|
|
const char *node, unsigned int *num, const char ***result);
|
|
|
|
/**
|
|
* Determine if a path exists in the XenStore.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the path to read.
|
|
* \param node The basename of the path to read.
|
|
*
|
|
* \retval 1 The path exists.
|
|
* \retval 0 The path does not exist or an error occurred attempting
|
|
* to make that determination.
|
|
*/
|
|
int xs_exists(struct xs_transaction t, const char *dir, const char *node);
|
|
|
|
/**
|
|
* Get the contents of a single "file". Returns the contents in
|
|
* *result which should be freed with free(*result, M_XENSTORE) after
|
|
* use. The length of the value in bytes is returned in *len.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the file to read.
|
|
* \param node The basename of the file to read.
|
|
* \param len The amount of data read.
|
|
* \param result The returned contents from this file.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*
|
|
* \note The results buffer is malloced and should be free'd by the
|
|
* caller with 'free(*result, M_XENSTORE)'.
|
|
*/
|
|
int xs_read(struct xs_transaction t, const char *dir,
|
|
const char *node, unsigned int *len, void **result);
|
|
|
|
/**
|
|
* Write to a single file.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the file to write.
|
|
* \param node The basename of the file to write.
|
|
* \param string The NUL terminated string of data to write.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_write(struct xs_transaction t, const char *dir,
|
|
const char *node, const char *string);
|
|
|
|
/**
|
|
* Create a new directory.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the directory to create.
|
|
* \param node The basename of the directory to create.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_mkdir(struct xs_transaction t, const char *dir,
|
|
const char *node);
|
|
|
|
/**
|
|
* Remove a file or directory (directories must be empty).
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the directory to remove.
|
|
* \param node The basename of the directory to remove.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_rm(struct xs_transaction t, const char *dir, const char *node);
|
|
|
|
/**
|
|
* Destroy a tree of files rooted at dir/node.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the directory to remove.
|
|
* \param node The basename of the directory to remove.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_rm_tree(struct xs_transaction t, const char *dir,
|
|
const char *node);
|
|
|
|
/**
|
|
* Start a transaction.
|
|
*
|
|
* Changes by others will not be seen during the lifetime of this
|
|
* transaction, and changes will not be visible to others until it
|
|
* is committed (xs_transaction_end).
|
|
*
|
|
* \param t The returned transaction.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_transaction_start(struct xs_transaction *t);
|
|
|
|
/**
|
|
* End a transaction.
|
|
*
|
|
* \param t The transaction to end/commit.
|
|
* \param abort If non-zero, the transaction is discarded
|
|
* instead of committed.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_transaction_end(struct xs_transaction t, int abort);
|
|
|
|
/*
|
|
* Single file read and scanf parsing of the result.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the path to read.
|
|
* \param node The basename of the path to read.
|
|
* \param scancountp The number of input values assigned (i.e. the result
|
|
* of scanf).
|
|
* \param fmt Scanf format string followed by a variable number of
|
|
* scanf input arguments.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of failure.
|
|
*/
|
|
int xs_scanf(struct xs_transaction t,
|
|
const char *dir, const char *node, int *scancountp, const char *fmt, ...)
|
|
__attribute__((format(scanf, 5, 6)));
|
|
|
|
/**
|
|
* Printf formatted write to a XenStore file.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the path to read.
|
|
* \param node The basename of the path to read.
|
|
* \param fmt Printf format string followed by a variable number of
|
|
* printf arguments.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of write failure.
|
|
*/
|
|
int xs_printf(struct xs_transaction t, const char *dir,
|
|
const char *node, const char *fmt, ...)
|
|
__attribute__((format(printf, 4, 5)));
|
|
|
|
/**
|
|
* va_list version of xenbus_printf().
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the path to read.
|
|
* \param node The basename of the path to read.
|
|
* \param fmt Printf format string.
|
|
* \param ap Va_list of printf arguments.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of write failure.
|
|
*/
|
|
int xs_vprintf(struct xs_transaction t, const char *dir,
|
|
const char *node, const char *fmt, va_list ap);
|
|
|
|
/**
|
|
* Multi-file read within a single directory and scanf parsing of
|
|
* the results.
|
|
*
|
|
* \param t The XenStore transaction covering this request.
|
|
* \param dir The dirname of the paths to read.
|
|
* \param ... A variable number of argument triples specifying
|
|
* the file name, scanf-style format string, and
|
|
* output variable (pointer to storage of the results).
|
|
* The last triple in the call must be terminated
|
|
* will a final NULL argument. A NULL format string
|
|
* will cause the entire contents of the given file
|
|
* to be assigned as a NUL terminated, M_XENSTORE heap
|
|
* backed, string to the output parameter of that tuple.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of read failure.
|
|
*
|
|
* Example:
|
|
* char protocol_abi[64];
|
|
* uint32_t ring_ref;
|
|
* char *dev_type;
|
|
* int error;
|
|
*
|
|
* error = xenbus_gather(XBT_NIL, xenbus_get_node(dev),
|
|
* "ring-ref", "%" PRIu32, &ring_ref,
|
|
* "protocol", "%63s", protocol_abi,
|
|
* "device-type", NULL, &dev_type,
|
|
* NULL);
|
|
*
|
|
* ...
|
|
*
|
|
* free(dev_type, M_XENSTORE);
|
|
*/
|
|
int xs_gather(struct xs_transaction t, const char *dir, ...);
|
|
|
|
/**
|
|
* Register a XenStore watch.
|
|
*
|
|
* XenStore watches allow a client to be notified via a callback (embedded
|
|
* within the watch object) of changes to an object in the XenStore.
|
|
*
|
|
* \param watch An xs_watch struct with it's node and callback fields
|
|
* properly initialized.
|
|
*
|
|
* \return On success, 0. Otherwise an errno value indicating the
|
|
* type of write failure. EEXIST errors from the XenStore
|
|
* are supressed, allowing multiple, physically different,
|
|
* xenbus_watch objects, to watch the same path in the XenStore.
|
|
*/
|
|
int xs_register_watch(struct xs_watch *watch);
|
|
|
|
/**
|
|
* Unregister a XenStore watch.
|
|
*
|
|
* \param watch An xs_watch object previously used in a successful call
|
|
* to xs_register_watch().
|
|
*
|
|
* The xs_watch object's node field is not altered by this call.
|
|
* It is the caller's responsibility to properly dispose of both the
|
|
* watch object and the data pointed to by watch->node.
|
|
*/
|
|
void xs_unregister_watch(struct xs_watch *watch);
|
|
|
|
/**
|
|
* Allocate and return an sbuf containing the XenStore path string
|
|
* <dir>/<name>. If name is the NUL string, the returned sbuf contains
|
|
* the path string <dir>.
|
|
*
|
|
* \param dir The NUL terminated directory prefix for new path.
|
|
* \param name The NUL terminated basename for the new path.
|
|
*
|
|
* \return A buffer containing the joined path.
|
|
*/
|
|
struct sbuf *xs_join(const char *, const char *);
|
|
|
|
/**
|
|
* Lock the xenstore request mutex.
|
|
*/
|
|
void xs_lock(void);
|
|
|
|
/**
|
|
* Unlock the xenstore request mutex.
|
|
*/
|
|
void xs_unlock(void);
|
|
|
|
#endif /* _XEN_XENSTORE_XENSTOREVAR_H */
|
|
|