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.
I will wait for a week for people to voice their opinions. If I hear no objection I will apply this series to hyperv-next.
Thanks, Wei.
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
drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 23 ++++-------- drivers/hv/channel_mgmt.c | 29 ++++++--------- drivers/hv/connection.c | 6 ++-- drivers/hv/vmbus_drv.c | 60 +++++++------------------------ drivers/scsi/storvsc_drv.c | 36 +++++-------------- drivers/video/fbdev/hyperv_fb.c | 23 ++---------- include/linux/hyperv.h | 10 ++++-- 7 files changed, 52 insertions(+), 135 deletions(-)
-- 1.8.3.1