c4583c8c39
Currently a single watch on /local/domain/X/backend is registered by each QEMU process running in service domain X (where X is usually 0). The purpose of this watch is to ensure that QEMU is notified when the Xen toolstack creates a new device backend area. Such a backend area is specific to a single frontend area created for a specific guest domain and, since each QEMU process is also created to service a specfic guest domain, it is unnecessary and inefficient to notify all QEMU processes. Only the QEMU process associated with the same guest domain need receive the notification. This patch re-factors the watch registration code such that notifications are targetted appropriately. Reported-by: Jerome Leseinne <jerome.leseinne@gmail.com> Signed-off-by: Paul Durrant <pdurrant@amazon.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20201001081500.1026-1-paul@xen.org> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2018 Citrix Systems Inc.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef HW_XEN_BACKEND_H
|
|
#define HW_XEN_BACKEND_H
|
|
|
|
#include "hw/xen/xen-bus.h"
|
|
|
|
typedef struct XenBackendInstance XenBackendInstance;
|
|
|
|
typedef void (*XenBackendDeviceCreate)(XenBackendInstance *backend,
|
|
QDict *opts, Error **errp);
|
|
typedef void (*XenBackendDeviceDestroy)(XenBackendInstance *backend,
|
|
Error **errp);
|
|
|
|
typedef struct XenBackendInfo {
|
|
const char *type;
|
|
XenBackendDeviceCreate create;
|
|
XenBackendDeviceDestroy destroy;
|
|
} XenBackendInfo;
|
|
|
|
XenBus *xen_backend_get_bus(XenBackendInstance *backend);
|
|
const char *xen_backend_get_name(XenBackendInstance *backend);
|
|
|
|
void xen_backend_set_device(XenBackendInstance *backend,
|
|
XenDevice *xendevice);
|
|
XenDevice *xen_backend_get_device(XenBackendInstance *backend);
|
|
|
|
void xen_backend_register(const XenBackendInfo *info);
|
|
const char **xen_backend_get_types(unsigned int *nr);
|
|
|
|
void xen_backend_device_create(XenBus *xenbus, const char *type,
|
|
const char *name, QDict *opts, Error **errp);
|
|
bool xen_backend_try_device_destroy(XenDevice *xendev, Error **errp);
|
|
|
|
#endif /* HW_XEN_BACKEND_H */
|