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Drivers: hv: vmbus: Remove support for Hyper-V 2008 and Hyper-V 2008R2/Win7

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The VMbus driver has special case code for running on the first released
versions of Hyper-V: 2008 and 2008 R2/Windows 7. These versions are now
out of support (except for extended security updates) and lack the
performance features needed for effective production usage of Linux
guests.

Simplify the code by removing the negotiation of the VMbus protocol
versions required for these releases of Hyper-V, and by removing the
special case code for handling these VMbus protocol versions.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/1651509391-2058-2-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley
2022-05-02 09:36:28 -07:00
committed by Wei Liu
parent f1f8288d19
commit a6b94c6b49
4 changed files with 33 additions and 72 deletions
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10
include/linux/hyperv.h
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@@ -230,15 +230,19 @@ static inline u32 hv_get_avail_to_write_percent(
* two 16 bit quantities: major_number. minor_number.
*
* 0 . 13 (Windows Server 2008)
* 1 . 1 (Windows 7)
* 2 . 4 (Windows 8)
* 3 . 0 (Windows 8 R2)
* 1 . 1 (Windows 7, WS2008 R2)
* 2 . 4 (Windows 8, WS2012)
* 3 . 0 (Windows 8.1, WS2012 R2)
* 4 . 0 (Windows 10)
* 4 . 1 (Windows 10 RS3)
* 5 . 0 (Newer Windows 10)
* 5 . 1 (Windows 10 RS4)
* 5 . 2 (Windows Server 2019, RS5)
* 5 . 3 (Windows Server 2022)
*
* The WS2008 and WIN7 versions are listed here for
* completeness but are no longer supported in the
* Linux kernel.
*/
#define VERSION_WS2008 ((0 << 16) | (13))