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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
/*
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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_BACKEND_H
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#define HW_XEN_BACKEND_H
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#include "hw/xen/xen-bus.h"
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typedef struct XenBackendInstance XenBackendInstance;
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typedef void (*XenBackendDeviceCreate)(XenBackendInstance *backend,
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QDict *opts, Error **errp);
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typedef void (*XenBackendDeviceDestroy)(XenBackendInstance *backend,
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Error **errp);
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typedef struct XenBackendInfo {
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const char *type;
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XenBackendDeviceCreate create;
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XenBackendDeviceDestroy destroy;
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} XenBackendInfo;
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XenBus *xen_backend_get_bus(XenBackendInstance *backend);
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const char *xen_backend_get_name(XenBackendInstance *backend);
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void xen_backend_set_device(XenBackendInstance *backend,
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XenDevice *xendevice);
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XenDevice *xen_backend_get_device(XenBackendInstance *backend);
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void xen_backend_register(const XenBackendInfo *info);
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const char **xen_backend_get_types(unsigned int *nr);
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void xen_backend_device_create(XenBus *xenbus, const char *type,
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const char *name, QDict *opts, Error **errp);
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bool xen_backend_try_device_destroy(XenDevice *xendev, Error **errp);
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#endif /* HW_XEN_BACKEND_H */
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