Re: [PATCH v3 1/2] KVM: nVMX: Restore the VMCS12 layout from v4.0

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On Fri, Apr 27, 2018 at 11:14:35AM -0700, Jim Mattson wrote:
> Changing the VMCS12 layout breaks save/restore compatibility with
> older kvm releases.
> 
> Google has been saving/restoring nested VMX state based on the v4.0
> layout. There are no other known users of the
> KVM_{GET,SET}_NESTED_STATE ioctls, since those ioctls have not yet
> been accepted upstream.

What is the advantage of that layout vs the one that is now? I vaguelly
recall something about it being quite bloated and the newer more sparse?




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