KVM: nSVM: implement on demand allocation of the nested state
This way we don't waste memory on VMs which don't use nesting virtualization even when the host enabled it for them. Signed-off-by: NMaxim Levitsky <mlevitsk@redhat.com> Message-Id: <20201001112954.6258-5-mlevitsk@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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