x86/KVM/VMX: Split the VMX MSR LOAD structures to have an host/guest numbers

x86/KVM/VMX: Split the VMX MSR LOAD structures to have an host/guest numbers

There is no semantic change but this change allows an unbalanced amount of
MSRs to be loaded on VMEXIT and VMENTER, i.e. the number of MSRs to save or
restore on VMEXIT or VMENTER may be different.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Orabug: 28220674
CVE: CVE-2018-3646

(cherry picked from commit 33966dd6b2d2c352fae55412db2ea8cfff5df13a)

Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Conflicts:
	arch/x86/kvm/vmx.c
Contextual: different content; in this version, prepare_vmcs02_full
doesn't exist and nested_vmx_vmexit lacks the lines modified by the
original patch.