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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 Calculate the amount of memory that can be use to build the Page State Change data (SNP_PAGE_STATE_CHANGE_INFO) instead of using a hard-coded size. This allows for changes to the GHCB shared buffer size without having to make changes to the page state change code. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Erdem Aktas <erdemaktas@google.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Michael Roth <michael.roth@amd.com> Cc: Min Xu <min.m.xu@intel.com> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>