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Groups > linux.kernel > #1291635

[PATCH RESEND 25/27] Drivers: hv: vmbus: Force all channel messages to be delivered on CPU 0

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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>
---
 drivers/hv/connection.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 521f48e..3dc5a9c 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
-- 
1.7.4.1

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[PATCH RESEND 01/27] Drivers: hv: util: Increase the timeout for util services "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:30 +0100
  [PATCH RESEND 02/27] Drivers: hv: utils: run polling callback always in interrupt context "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:30 +0100
  [PATCH RESEND 03/27] tools: hv: report ENOSPC errors in hv_fcopy_daemon "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:30 +0100
  [PATCH RESEND 06/27] Drivers: hv: utils: use memdup_user in hvt_op_write "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:30 +0100
  [PATCH RESEND 04/27] tools: hv: remove repeated HV_FCOPY string "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:30 +0100
  [PATCH RESEND 10/27] drivers:hv: Define the channel type for Hyper-V PCI Express pass-through "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 09/27] drivers:hv: Export the API to invoke a hypercall on Hyper-V "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
    Re: [PATCH RESEND 09/27] drivers:hv: Export the API to invoke a  hypercall on Hyper-V Greg KH <gregkh@linuxfoundation.org> - 2015-12-15 04:10 +0100
      RE: [PATCH RESEND 09/27] drivers:hv: Export the API to invoke a  hypercall on Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-12-15 05:20 +0100
  [PATCH RESEND 14/27] Drivers: hv: vmbus: Get rid of the unused macro "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 20/27] Drivers: hv: vmbus: channge vmbus_connection.channel_lock to mutex "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 26/27] Drivers: hv: utils: Invoke the poll function after handshake "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 05/27] Drivers: hv: util: catch allocation errors "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 08/27] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 07/27] drivers/hv: cleanup synic msrs if vmbus connect failed "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 22/27] tools/hv: Use include/uapi with __EXPORTED_HEADERS__ "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
    Re: [PATCH RESEND 22/27] tools/hv: Use include/uapi with  __EXPORTED_HEADERS__ Greg KH <gregkh@linuxfoundation.org> - 2015-12-15 04:20 +0100
      Re: [PATCH RESEND 22/27] tools/hv: Use include/uapi with  __EXPORTED_HEADERS__ Kamal Mostafa <kamal@canonical.com> - 2015-12-15 19:20 +0100
        [PATCH v2] tools/hv: Use include/uapi with __EXPORTED_HEADERS__ Kamal Mostafa <kamal@canonical.com> - 2015-12-15 19:30 +0100
          Re: [PATCH v2] tools/hv: Use include/uapi with __EXPORTED_HEADERS__ Greg KH <gregkh@linuxfoundation.org> - 2015-12-15 19:50 +0100
  [PATCH RESEND 25/27] Drivers: hv: vmbus: Force all channel messages to be delivered on CPU 0 "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 21/27] drivers:hv: Allow for MMIO claims that span ACPI _CRS records "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 24/27] drivers/hv: correct tsc page sequence invalid value "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 11/27] Drivers: hv: vss: run only on supported host versions "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 27/27] tools: hv: vss: fix the write()'s argument: error -> vss_msg "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 16/27] Drivers: hv: vmbus: serialize process_chn_event() and vmbus_close_internal() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 18/27] Drivers: hv: vmbus: fix rescind-offer handling for device without a driver "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 19/27] Drivers: hv: vmbus: release relid on error in vmbus_process_offer() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 23/27] Drivers: hv: vmbus: Fix a Host signaling bug "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:40 +0100
  [PATCH RESEND 17/27] Drivers: hv: vmbus: do sanity check of channel state in vmbus_close_internal() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:50 +0100
  [PATCH RESEND 13/27] Drivers: hv: vmbus: Use uuid_le_cmp() for comparing GUIDs "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:50 +0100
  [PATCH RESEND 12/27] Drivers: hv: vmbus: Use uuid_le type consistently "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:50 +0100
  [PATCH RESEND 15/27] Drivers: hv: vmbus: Get rid of the unused irq variable "K. Y. Srinivasan" <kys@microsoft.com> - 2015-12-14 23:50 +0100

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