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xen-bus: use a separate fd for each event channel

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To better support use of IOThread-s it will be necessary to be able to set
the AioContext for each XenEventChannel and hence it is necessary to open a
separate handle to libxenevtchan for each channel.

This patch stops using NotifierList for event channel callbacks, replacing
that construct by a list of complete XenEventChannel structures. Each of
these now has a xenevtchn_handle pointer in place of the single pointer
previously held in the XenDevice structure. The individual handles are
opened/closed in xen_device_bind/unbind_event_channel(), replacing the
single open/close in xen_device_realize/unrealize().

NOTE: This patch does not add an AioContext parameter to
      xen_device_bind_event_channel(). That will be done in a subsequent
      patch.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20190408151617.13025-2-paul.durrant@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Paul Durrant 2019-04-08 16:16:15 +01:00 • committed by Anthony PERARD
parent 5feeb718d7
commit c0b336ea19
2 changed files with 42 additions and 43 deletions
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6
include/hw/xen/xen-bus.h
View file

@ -15,6 +15,7 @@
typedef void (*XenWatchHandler)(void *opaque);
typedef struct XenWatch XenWatch;
typedef struct XenEventChannel XenEventChannel;
typedef struct XenDevice {
DeviceState qdev;
@ -28,8 +29,7 @@ typedef struct XenDevice {
XenWatch *backend_online_watch;
xengnttab_handle *xgth;
bool feature_grant_copy;
xenevtchn_handle *xeh;
NotifierList event_notifiers;
QLIST_HEAD(, XenEventChannel) event_channels;
} XenDevice;
typedef char *(*XenDeviceGetName)(XenDevice *xendev, Error **errp);
@ -119,8 +119,6 @@ void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
XenDeviceGrantCopySegment segs[],
unsigned int nr_segs, Error **errp);
typedef struct XenEventChannel XenEventChannel;
typedef void (*XenEventHandler)(void *opaque);
XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,