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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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4
include/linux/hyperv.h
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@@ -147,15 +147,17 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
* 0 . 13 (Windows Server 2008)
* 1 . 1 (Windows 7)
* 2 . 4 (Windows 8)
* 3 . 0 (Windows 8 R2)
*/
#define VERSION_WS2008 ((0 << 16) | (13))
#define VERSION_WIN7 ((1 << 16) | (1))
#define VERSION_WIN8 ((2 << 16) | (4))
#define VERSION_WIN8_1 ((3 << 16) | (0))
#define VERSION_INVAL -1
#define VERSION_CURRENT VERSION_WIN8
#define VERSION_CURRENT VERSION_WIN8_1
/* Make maximum size of pipe payload of 16K */
#define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384)