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>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 521f48ed188e..3dc5a9c7fad6 100644
--- 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