KVM: x86: only allocate gfn_track when necessary
Avoid allocating the gfn_track arrays if nothing needs them. If there are no external to KVM users of the API (i.e. no GVT-g), then page tracking is only needed for shadow page tables. This means that when tdp is enabled and there are no external users, then the gfn_track arrays can be lazily allocated when the shadow MMU is actually used. This avoid allocations equal to .05% of guest memory when nested virtualization is not used, if the kernel is compiled without GVT-g. Signed-off-by: David Stevens <stevensd@chromium.org> Message-Id: <20210922045859.2011227-3-stevensd@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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