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>
CVE-2018-3620
CVE-2018-3646

[tyhicks: Backport around prepare_vmcs02_full() not yet existing]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>