x86/kvm/mmu: make vcpu->mmu a pointer to the current MMU
As a preparation to full MMU split between L1 and L2 make vcpu->arch.mmu a pointer to the currently used mmu. For now, this is always vcpu->arch.root_mmu. No functional change. Signed-off-by:Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Reviewed-by:
Sean Christopherson <sean.j.christopherson@intel.com>
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