Tom Lendacky 0d7601e546 UefiCpuPkg: Add a 16-bit protected mode code segment descriptor ... BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 A hypervisor is not allowed to update an SEV-ES guests register state, so when booting an SEV-ES guest AP, the hypervisor is not allowed to set the RIP to the guest requested value. Instead, an SEV-ES AP must be transition from 64-bit long mode to 16-bit real mode in response to an INIT-SIPI-SIPI sequence. This requires a 16-bit code segment descriptor. For PEI, create this descriptor in the reset vector GDT table. For DXE, create this descriptor from the newly reserved entry at location 0x28. Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Eric Dong <eric.dong@intel.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>		2020-08-17 02:46:39 +00:00
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FixupVtf	UefiCpuPkg: Replace BSD License with BSD+Patent License	2019-04-09 10:58:28 -07:00
Vtf0	UefiCpuPkg: Add a 16-bit protected mode code segment descriptor	2020-08-17 02:46:39 +00:00