From: Thomas Gleixner <redacted>
Sent: Friday, July 17, 2020 6:03 AM
[...]

Hi, I'm very sorry for this extremely late reply -- I was sidetracked by something
else and I just had a chance to revisit the issue. Thank you tglx for the comments
and suggestions, which I think are reasonable. I realized this patch is problematic.
The good news is that the LAPIC emulation bug has been fixed in the latest version
of Hyper-V and now kdump can work reliably. I think the hypervisor fix would be 
backported to old Hyper-V versions, so hopefully this won't be an issue over time.

Thanks,
-- Dexuan