Drivers: hv: Add state to manage incoming channel interrupt load

Add state to bind a channel to a specific VCPU. This will help us better
distribute incoming interrupt load.

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, 19 insertions, 2 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index c6e2c44a1be9..8c3cb1fc34d4 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -732,8 +732,15 @@ struct vmbus_channel_open_channel {
         /* GPADL for the channel's ring buffer. */
         u32 ringbuffer_gpadlhandle;
 
-        /* GPADL for the channel's server context save area. */
-        u32 server_contextarea_gpadlhandle;
+        /*
+         * Starting with win8, this field will be used to specify
+         * the target virtual processor on which to deliver the interrupt for
+         * the host to guest communication.
+         * Prior to win8, incoming channel interrupts would only
+         * be delivered on cpu 0. Setting this value to 0 would
+         * preserve the earlier behavior.
+         */
+        u32 target_vp;
 
         /*
         * The upstream ring buffer begins at offset zero in the memory
@@ -971,6 +978,16 @@ struct vmbus_channel {
         bool is_dedicated_interrupt;
         struct hv_input_signal_event_buffer sig_buf;
         struct hv_input_signal_event *sig_event;
+
+        /*
+         * Starting with win8, this field will be used to specify
+         * the target virtual processor on which to deliver the interrupt for
+         * the host to guest communication.
+         * Prior to win8, incoming channel interrupts would only
+         * be delivered on cpu 0. Setting this value to 0 would
+         * preserve the earlier behavior.
+         */
+        u32 target_vp;
 };
 
 static inline void set_channel_read_state(struct vmbus_channel *c, bool state)