[PATCH v2 0/3] SEV Page Encryption Bitmap support for OVMF.

[ashish.kalra@amd.com]

From: Ashish Kalra <ashish.kalra@amd.com>

By default all the SEV guest memory regions are considered encrypted,
if a guest changes the encryption attribute of the page (e.g mark a
page as decrypted) then notify hypervisor. Hypervisor will need to
track the unencrypted pages. The information will be used during
guest live migration, guest page migration and guest debugging.

The patch-set also adds a new SEV and SEV-ES hypercall abstraction
library to support SEV Page encryption/decryption status hypercalls
for SEV and SEV-ES guests.

BaseMemEncryptSevLib invokes hypercalls via this new hypercall library.

A branch containing these patches is available here:
https://github.com/ashkalra/edk2/tree/sev_page_encryption_bitmap_v2

Changes since v1:
 - Mark GHCB_BASE setup during reset-vector as decrypted explicitly in
   the hypervisor page encryption bitmap.
 - Resending the series with correct shallow threading.

Ashish Kalra (2):
  OvmfPkg/MemEncryptHypercallLib: add library to support SEV hypercalls.
  OvmfPkg/PlatformPei: Mark SEC GHCB page in the page encryption bitmap.

Brijesh Singh (1):
  OvmfPkg/BaseMemEncryptLib: Support to issue unencrypted hypercall

 .../Include/Library/MemEncryptHypercallLib.h  |  37 ++++++
 .../BaseMemEncryptSevLib.inf                  |   1 +
 .../BaseMemEncryptSevLib/X64/VirtualMemory.c  |  18 +++
 .../MemEncryptHypercallLib.c                  | 105 ++++++++++++++++++
 .../MemEncryptHypercallLib.inf                |  39 +++++++
 .../X64/AsmHelperStub.nasm                    |  39 +++++++
 OvmfPkg/OvmfPkgX64.dsc                        |   1 +
 OvmfPkg/PlatformPei/AmdSev.c                  |  10 ++
 8 files changed, 250 insertions(+)
 create mode 100644 OvmfPkg/Include/Library/MemEncryptHypercallLib.h
 create mode 100644 OvmfPkg/Library/MemEncryptHypercallLib/MemEncryptHypercallLib.c
 create mode 100644 OvmfPkg/Library/MemEncryptHypercallLib/MemEncryptHypercallLib.inf
 create mode 100644 OvmfPkg/Library/MemEncryptHypercallLib/X64/AsmHelperStub.nasm

-- 
2.17.1