Brijesh Singh e60af8a1eb OvmfPkg/ResetVector: Set C-bit when building initial page table ... SEV guest VMs have the concept of private and shared memory. Private memory is encrypted with the guest-specific key, while shared memory may be encrypted with hypervisor key. Certain types of memory (namely instruction pages and guest page tables) are always treated as private memory by the hardware. The C-bit in PTE indicate whether the page is private or shared. The C-bit position for the PTE can be obtained from CPUID Fn8000_001F[EBX]. When SEV is active, the BIOS is encrypted by the Qemu launch sequence, we must set the C-bit when building the page table. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Tom Lendacky <Thomas.Lendacky@amd.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>		2017-07-10 21:17:27 -07:00
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PageTables64.asm	OvmfPkg/ResetVector: Set C-bit when building initial page table	2017-07-10 21:17:27 -07:00