On Tue, May 01, 2018 at 03:40:27PM -0700, Jim Mattson wrote:
> Changing the VMCS12 layout will break save/restore compatibility with
> older kvm releases once the KVM_{GET,SET}_NESTED_STATE ioctls are
> accepted upstream. Google has already been using these ioctls for some
> time, and we implore the community not to disturb the existing layout.
>
> Move the four most recently added fields to preserve the offsets of
> the previously defined fields and reserve locations for the vmread and
> vmwrite bitmaps, which will be used in the virtualization of VMCS
> shadowing (to improve the performance of double-nesting).
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
