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xen-bus: reduce scope of backend watch

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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>
This commit is contained in:
Paul Durrant 2020-10-01 09:15:00 +01:00 • committed by Anthony PERARD
parent 2211118a2a
commit c4583c8c39
4 changed files with 46 additions and 9 deletions
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1
include/hw/xen/xen-backend.h
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@ -31,6 +31,7 @@ void xen_backend_set_device(XenBackendInstance *backend,
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);