Drivers: hv: vmbus: Force all channel messages to be delivered on CPU 0

Force all channel messages to be delivered on CPU0. These messages are not
performance critical and are used during the setup and teardown of the
channel.

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

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 521f48ed188e4cc37c6551b456be7ee574cbbcf4..3dc5a9c7fad6edda9fcaac0ecda2a24ca96822c5 100644 (file)
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -83,10 +83,13 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
        msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
        msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
        msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
-       if (version >= VERSION_WIN8_1) {
-               msg->target_vcpu = hv_context.vp_index[get_cpu()];
-               put_cpu();
-       }
+       /*
+        * We want all channel messages to be delivered on CPU 0.
+        * This has been the behavior pre-win8. This is not
+        * perf issue and having all channel messages delivered on CPU 0
+        * would be ok.
+        */
+       msg->target_vcpu = 0;
 
        /*
         * Add to list before we send the request since we may