This is a note to let you know that I've just added the patch titled
Drivers: hv: vmbus: Specify the target CPU that should receive
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From e28bab4828354583bb66ac09021ca69b341a7db4 Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Date: Wed, 15 Jan 2014 17:12:58 -0800
Subject: Drivers: hv: vmbus: Specify the target CPU that should receive
notification
During the initial VMBUS connect phase, starting with WS2012 R2, we should
specify the VPCU in the guest that should receive the notification. Fix this
issue. This fix is required to properly connect to the host in the kexeced
kernel.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [3.9+]
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/connection.c | 2 ++
include/linux/hyperv.h | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index af6edf9b1936..855bbda9964d 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -78,6 +78,8 @@ 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)
+ msg->target_vcpu = hv_context.vp_index[smp_processor_id()];
/*
* Add to list before we send the request since we may
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 15da677478dd..344883dce584 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -875,7 +875,7 @@ struct vmbus_channel_relid_released {
struct vmbus_channel_initiate_contact {
struct vmbus_channel_message_header header;
u32 vmbus_version_requested;
- u32 padding2;
+ u32 target_vcpu; /* The VCPU the host should respond to */
u64 interrupt_page;
u64 monitor_page1;
u64 monitor_page2;
--
1.8.5.1.163.gd7aced9
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