Drivers: hv: Manage signaling state on a per-connection basis

The current code has a global handle for supporting signaling of the host
from guest. Make this a per-channel attribute as on some versions of the
host we can signal on per-channel handle.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 7bf59177aaf8..f4d990285d99 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -282,6 +282,26 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
          */
         newchannel->batched_reading = true;
 
+        /*
+         * Setup state for signalling the host.
+         */
+        newchannel->sig_event = (struct hv_input_signal_event *)
+                                (ALIGN((unsigned long)
+                                &newchannel->sig_buf,
+                                HV_HYPERCALL_PARAM_ALIGN));
+
+        newchannel->sig_event->connectionid.asu32 = 0;
+        newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID;
+        newchannel->sig_event->flag_number = 0;
+        newchannel->sig_event->rsvdz = 0;
+
+        if (vmbus_proto_version != VERSION_WS2008) {
+                newchannel->is_dedicated_interrupt =
+                                (offer->is_dedicated_interrupt != 0);
+                newchannel->sig_event->connectionid.u.id =
+                                offer->connection_id;
+        }
+
         memcpy(&newchannel->offermsg, offer,
                sizeof(struct vmbus_channel_offer_channel));
         newchannel->monitor_grp = (u8)offer->monitorid / 32;