[Qemu-devel] [PULL 3/8] xen-bus: allow AioContext to be specified for each event channel

[Anthony PERARD <anthony.perard@citrix.com>]

From: Paul Durrant <paul.durrant@citrix.com>

This patch adds an AioContext parameter to xen_device_bind_event_channel()
and then uses aio_set_fd_handler() to set the callback rather than
qemu_set_fd_handler().

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20190408151617.13025-3-paul.durrant@citrix.com>
[Call aio_set_fd_handler() with is_external=true]
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 hw/block/dataplane/xen-block.c |  2 +-
 hw/xen/xen-bus.c               | 10 +++++++---
 include/hw/xen/xen-bus.h       |  1 +
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/hw/block/dataplane/xen-block.c b/hw/block/dataplane/xen-block.c
index 6da5c77fbb..aadca75644 100644
--- a/hw/block/dataplane/xen-block.c
+++ b/hw/block/dataplane/xen-block.c
@@ -806,7 +806,7 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
     }
 
     dataplane->event_channel =
-        xen_device_bind_event_channel(xendev, event_channel,
+        xen_device_bind_event_channel(xendev, dataplane->ctx, event_channel,
                                       xen_block_dataplane_event, dataplane,
                                       &local_err);
     if (local_err) {
diff --git a/hw/xen/xen-bus.c b/hw/xen/xen-bus.c
index 43a90cae42..2210526490 100644
--- a/hw/xen/xen-bus.c
+++ b/hw/xen/xen-bus.c
@@ -925,6 +925,7 @@ void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
 
 struct XenEventChannel {
     QLIST_ENTRY(XenEventChannel) list;
+    AioContext *ctx;
     xenevtchn_handle *xeh;
     evtchn_port_t local_port;
     XenEventHandler handler;
@@ -944,6 +945,7 @@ static void xen_device_event(void *opaque)
 }
 
 XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
+                                               AioContext *ctx,
                                                unsigned int port,
                                                XenEventHandler handler,
                                                void *opaque, Error **errp)
@@ -969,8 +971,9 @@ XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
     channel->handler = handler;
     channel->opaque = opaque;
 
-    qemu_set_fd_handler(xenevtchn_fd(channel->xeh), xen_device_event, NULL,
-                        channel);
+    channel->ctx = ctx;
+    aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
+                       xen_device_event, NULL, NULL, channel);
 
     QLIST_INSERT_HEAD(&xendev->event_channels, channel, list);
 
@@ -1011,7 +1014,8 @@ void xen_device_unbind_event_channel(XenDevice *xendev,
 
     QLIST_REMOVE(channel, list);
 
-    qemu_set_fd_handler(xenevtchn_fd(channel->xeh), NULL, NULL, NULL);
+    aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
+                       NULL, NULL, NULL, NULL);
 
     if (xenevtchn_unbind(channel->xeh, channel->local_port) < 0) {
         error_setg_errno(errp, errno, "xenevtchn_unbind failed");
diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h
index 3315f0de20..8183b98c7d 100644
--- a/include/hw/xen/xen-bus.h
+++ b/include/hw/xen/xen-bus.h
@@ -122,6 +122,7 @@ void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
 typedef void (*XenEventHandler)(void *opaque);
 
 XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
+                                               AioContext *ctx,
                                                unsigned int port,
                                                XenEventHandler handler,
                                                void *opaque, Error **errp);
-- 
Anthony PERARD