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CVM guests can configure GHCB page multiple times during it's lifetime depending on it's requirement. For example a Linux CVM guest configures a different GHCB page during compressed kernel boot and sets up a new one after decompressing the kernel. As a cleanup step, VMM should unset the previous GHCB page before registering a new one for a particular vcpu thread. Signed-off-by: Jinank Jain <jinankjain@microsoft.com>