[PATCH v3 0/3] reuse the SevEsWork area

["Brijesh Singh" <brijesh.singh@amd.com>]

Based on the discussion on the mailing list, we agreed that instead
of wasting extra page in the MEMFD, we can reuse the SevEsWorkArea
buffer for the TDX. To avoid any confusion, lets introduce a OvmfWorkArea
that will contains 32 bytes of header followed by the actual workarea.

While at it, move the code to clear the GHCB page from PageTable build
to AmdSev.asm.

I have used the existing TDX BZ for it because the request came
during the TDX patch review. if anyone have concern please let me know
and I will happily create a new BZ.

Full tree is at: https://github.com/AMDESE/ovmf/tree/sev-new-work-area

Brijesh Singh (3):
  OvmfPkg: introduce a common work area
  OvmfPkg/ResetVector: update SEV support to use new work area format
  OvmfPkg/ResetVector: move the GHCB page setup in AmdSev.asm

Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>

Changes since v2:
 - address Tom's feedback

Changes since v1:
 - address Jiewen's feedback.

Brijesh Singh (3):
  OvmfPkg: introduce a common work area
  OvmfPkg/ResetVector: update SEV support to use new work area format
  OvmfPkg/ResetVector: move the GHCB page setup in AmdSev.asm

 OvmfPkg/OvmfPkg.dec                        |  12 +++
 OvmfPkg/OvmfPkgX64.fdf                     |   9 +-
 OvmfPkg/PlatformPei/PlatformPei.inf        |   4 +-
 OvmfPkg/ResetVector/ResetVector.inf        |   1 +
 OvmfPkg/Sec/SecMain.inf                    |   2 +
 OvmfPkg/Include/Library/MemEncryptSevLib.h |  21 +---
 OvmfPkg/Include/WorkArea.h                 |  67 +++++++++++++
 OvmfPkg/PlatformPei/MemDetect.c            |   8 +-
 OvmfPkg/Sec/SecMain.c                      |  36 ++++++-
 OvmfPkg/OvmfPkgDefines.fdf.inc             |   6 ++
 OvmfPkg/ResetVector/Ia32/AmdSev.asm        | 109 +++++++++++++++++----
 OvmfPkg/ResetVector/Ia32/PageTables64.asm  |  57 +++--------
 OvmfPkg/ResetVector/ResetVector.nasmb      |   1 +
 13 files changed, 238 insertions(+), 95 deletions(-)
 create mode 100644 OvmfPkg/Include/WorkArea.h

-- 
2.17.1