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, 25 insertions, 0 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index e72502689cdc..c6e2c44a1be9 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -897,6 +897,27 @@ struct vmbus_close_msg {
         struct vmbus_channel_close_channel msg;
 };
 
+/* Define connection identifier type. */
+union hv_connection_id {
+        u32 asu32;
+        struct {
+                u32 id:24;
+                u32 reserved:8;
+        } u;
+};
+
+/* Definition of the hv_signal_event hypercall input structure. */
+struct hv_input_signal_event {
+        union hv_connection_id connectionid;
+        u16 flag_number;
+        u16 rsvdz;
+};
+
+struct hv_input_signal_event_buffer {
+        u64 align8;
+        struct hv_input_signal_event event;
+};
+
 struct vmbus_channel {
         struct list_head listentry;
 
@@ -946,6 +967,10 @@ struct vmbus_channel {
          */
 
         bool batched_reading;
+
+        bool is_dedicated_interrupt;
+        struct hv_input_signal_event_buffer sig_buf;
+        struct hv_input_signal_event *sig_event;
 };
 
 static inline void set_channel_read_state(struct vmbus_channel *c, bool state)