[PULL][Artful] Fix KVM hang on ThunderX systems

[Seth Forshee]

On Thu, Jul 20, 2017 at 03:54:46PM -0600, dann frazier wrote:
> BugLink: https://bugs.launchpad.net/bugs/1673564
> 
> There's a pretty nasty errata for ThunderX SoCs in which a guest can
> cause interrupts to be disabled on the host kernel. The symptoms vary,
> but it's easy to reproduce running a bunch of parallel VM start/stop
> loops.
> 
> There was quite a bit of backporting required for the patches in this
> series. For such patches, I've described the changes required in a
> comment above my S-o-B. They are mostly mechanical transformations to
> revert macro cleanups that occurred post-4.11.
> 
> This survived an overnight run of my parallel VM start/stop test on a
> CRB1S, whereas an unpatched system would fail in just a few minutes.
> 
> I created this backport as a stepping stone towards 4.10. While I
> suspect artful's days of 4.11 are quickly coming to an end, I figured
> I might as well submit it since I have it. Note that while this
> backport cherry-picks cleanly back to Ubuntu's 4.10, it isn't
> compatible - by which I mean, KVM crashes immediately. Diagnosing that
> is my next step.
> 
> The following changes since commit bfdccafa8f542c8f9740a64ecb110e4982e336c0:
> 
>   platform/x86: thinkpad_acpi: add mapping for new hotkeys (2017-07-20
> 14:50:48 -0500)
> 
> are available in the git repository at:
> 
>   git://git.launchpad.net/~dannf/ubuntu/+source/linux/+git/linux
> lp1673564-artful
> 
> for you to fetch changes up to 08ecebdce871761059927c93adcb3cb90da2680e:
> 
>   KVM: arm64: Log an error if trapping a write-to-read-only GICv3
> access (2017-07-20 15:31:07 -0600)

Quick question. When I fetched your tree I noticed a lp1673564-unstable
branch as well. Is that one ready to go for unstable?

Seth