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Drivers: hv: vmbus: Negotiate version 3.0 when running on ws2012r2 hosts

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Only ws2012r2 hosts support the ability to reconnect to the host on VMBUS. This functionality
is needed by kexec in Linux. To use this functionality we need to negotiate version 3.0 of the
VMBUS protocol.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>        [3.9+]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan
2014-04-03 18:02:45 -07:00
committed by Greg Kroah-Hartman
parent 314672a2c2
commit 03367ef5ea
2 changed files with 7 additions and 2 deletions
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5
drivers/hv/connection.c
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@@ -55,6 +55,9 @@ static __u32 vmbus_get_next_version(__u32 current_version)
case (VERSION_WIN8):
return VERSION_WIN7;
case (VERSION_WIN8_1):
return VERSION_WIN8;
case (VERSION_WS2008):
default:
return VERSION_INVAL;
@@ -77,7 +80,7 @@ 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)
if (version == VERSION_WIN8_1)
msg->target_vcpu = hv_context.vp_index[smp_processor_id()];
/*