On Sun, Oct 27, 2019 at 05:35:00PM +0000, Michael Kelley wrote:

From: gregkh@linuxfoundation.org gregkh@linuxfoundation.org

...

This is a note to let you know that I've just added the patch titled

x86/hyperv: Make vapic support x2apic mode

to the 4.19-stable tree which can be found at:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git

The filename of the patch is: x86-hyperv-make-vapic-support-x2apic-mode.patch and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From e211288b72f15259da86eed6eca680758dbe9e74 Mon Sep 17 00:00:00 2001 From: Roman Kagan rkagan@virtuozzo.com Date: Thu, 10 Oct 2019 12:33:05 +0000 Subject: x86/hyperv: Make vapic support x2apic mode

From: Roman Kagan rkagan@virtuozzo.com

commit e211288b72f15259da86eed6eca680758dbe9e74 upstream.

Now that there's Hyper-V IOMMU driver, Linux can switch to x2apic mode when supported by the vcpus.

This patch should not go back to the 4.19 stable tree. I don't think it will break anything, but there's no Hyper-V vIOMMU driver in 4.19 so x2apic_enabled() is never true.

Thanks for letting me know, now dropped.

greg k-h