On Wed, Feb 03, 2016 at 05:59:53PM +0000, Marc Zyngier wrote:

ARMv8.1 comes with the "Virtualization Host Extension" (VHE for
short), which enables simpler support of Type-2 hypervisors.

This extension allows the kernel to directly run at EL2, and
significantly reduces the number of system registers shared between
host and guest, reducing the overhead of virtualization.

In order to have the same kernel binary running on all versions of the
architecture, this series makes heavy use of runtime code patching.

The first 22 patches massage the KVM code to deal with VHE and enable
Linux to run at EL2. The last patch catches an ugly case when VHE
capable CPUs are paired with some of their less capable siblings. This
should never happen, but hey...

I have deliberately left out some of the more "advanced"
optimizations, as they are likely to distract the reviewer from the
core infrastructure, which is what I care about at the moment.

Note: GDB is currently busted on VHE systems, as it checks for version
      6 on the debug architecture, while VHE is version 7. The
      binutils people are on the case.

This has been tested on the FVP_Base_SLV-V8-A model, and based on
v4.5-rc2. I've put a branch out on:

git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe

You can have my reviewed-by on all patches that I didn't already review
or ack explicitly.

Only exception is the debug stuff where I didn't manage to page in the
context, so hopefully familiar with that code can have a look.

Then this is ready to be queued.

Thanks,
-Christoffer