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094a22399f
This patch adds a new source module, xen-bus-helper.c, which builds on
basic libxenstore primitives to provide functions to create (setting
permissions appropriately) and destroy xenstore areas, and functions to
'printf' and 'scanf' nodes therein. The main xen-bus code then uses
these primitives [1] to initialize and destroy the frontend and backend
areas for a XenDevice during realize and unrealize respectively.
The 'xen-block' implementation is extended with a 'get_name' method that
returns the VBD number. This number is required to 'name' the xenstore
areas.
NOTE: An exit handler is also added to make sure the xenstore areas are
cleaned up if QEMU terminates without devices being unrealized.
[1] The 'scanf' functions are actually not yet needed, but they will be
needed by code delivered in subsequent patches.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
/*
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* Copyright (c) 2018 Citrix Systems Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef HW_XEN_BUS_HELPER_H
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#define HW_XEN_BUS_HELPER_H
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#include "hw/xen/xen_common.h"
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const char *xs_strstate(enum xenbus_state state);
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void xs_node_create(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, struct xs_permissions perms[],
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unsigned int nr_perms, Error **errp);
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void xs_node_destroy(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, Error **errp);
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/* Write to node/key unless node is empty, in which case write to key */
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void xs_node_vprintf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, va_list ap)
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GCC_FMT_ATTR(6, 0);
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void xs_node_printf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, ...)
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GCC_FMT_ATTR(6, 7);
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/* Read from node/key unless node is empty, in which case read from key */
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int xs_node_vscanf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, va_list ap);
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int xs_node_scanf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, ...);
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#endif /* HW_XEN_BUS_HELPER_H */
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