Re: [PATCH 0/4] Remove support for Hyper-V 2008 and 2008R2/Win7

[Wei Liu <wei.liu@kernel.org>]

On Mon, May 02, 2022 at 09:36:27AM -0700, Michael Kelley wrote:
> Linux code for running as a Hyper-V guest includes special cases for the
> first released versions of Hyper-V: 2008 and 2008R2/Windows 7. These
> versions were very thinly used for running Linux guests when first
> released more than 12 years ago, and they are now out of support
> (except for extended security updates). As initial versions, they
> lack the performance features needed for effective production usage
> of Linux guests. In total, there's no need to continue to support
> the latest Linux kernels on these versions of Hyper-V.
> 
> Simplify the code for running on Hyper-V by removing the special
> cases. This includes removing the negotiation of the VMbus protocol
> versions for 2008 and 2008R2, and the special case code based on
> those VMbus protocol versions. Changes are in the core VMbus code and
> several drivers for synthetic VMbus devices.
> 
> Some drivers have driver-specific protocols with the Hyper-V host and
> may have versions of those protocols that are limited to 2008 and
> 2008R2. This patch set does the clean-up only for the top-level
> VMbus protocol versions, and not the driver-specific protocols.
> Cleaning up the driver-specific protocols can be done with
> follow-on patches.
> 
> There's no specific urgency to removing the special case code for
> 2008 and 2008R2, so if the broader Linux kernel community surfaces
> a reason why this clean-up should not be done now, we can wait.
> But I think we want to eventually stop carrying around this extra
> baggage, and based on discussions with the Hyper-V team within
> Microsoft, we're already past the point that it has any value.
> 
> Michael Kelley (4):
>   Drivers: hv: vmbus: Remove support for Hyper-V 2008 and Hyper-V
>     2008R2/Win7
>   scsi: storvsc: Remove support for Hyper-V 2008 and 2008R2/Win7
>   video: hyperv_fb: Remove support for Hyper-V 2008 and 2008R2/Win7
>   drm/hyperv: Remove support for Hyper-V 2008 and 2008R2/Win7

Applied to hyperv-next.