BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 Two new dynamic MdeModulePkg PCDs are needed to support SEV-ES under OVMF: - PcdGhcbBase: UINT64 value that is the base address of the GHCB allocation. - PcdGhcbSize: UINT64 value that is the size, in bytes, of the GHCB allocation (size is dependent on the number of APs). Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Reviewed-by: Hao A Wu <hao.a.wu@intel.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>