[PATCH V4 0/8] Enable secure-boot when lauch OVMF with -bios parameter

["Min Xu" <min.m.xu@intel.com>]

Secure-Boot related variables include the PK/KEK/DB/DBX and they are
stored in NvVarStore (OVMF_VARS.fd). When lauching with -pflash,
QEMU/OVMF will use emulated flash, and fully support UEFI variables.
But when launching with -bios parameter, UEFI variables will be partially
emulated, and non-volatile variables may lose their contents after a
reboot. See OvmfPkg/README.

Tdx guest is an example that -pflash is not supported. So this patch-set
is designed to initialize the NvVarStore with the content of in
OVMF_VARS.fd.

patch 1:
 Add a new function (AllocateRuntimePages) in PrePiMemoryAllocationLib.
 This function will be used in PeilessStartupLib which will run
 in SEC phase.

patch 2:
 Delete the TdxValidateCfv in PeilessStartupLib. Because it is going to
 be renamed to PlatformValidateNvVarStore and be moved to PlatformInitLib.

patch 3 - 7:
 Then we add functions for EmuVariableNvStore in PlatformInitLib. This
 lib will then be called in OvmfPkg/PlatformPei and PeilessStartupLib.
 We also shortcut ConnectNvVarsToFileSystem in secure-boot.

patch 8:
 At last a build-flag (SECURE_BOOT_FEATURE_ENABLED) is introduced in
 the dsc in OvmfPkg. Because the copy over of OVMR_VARS.fd to
 EmuVariableNvStore is only required when secure-boot is enabled.

Code: https://github.com/mxu9/edk2/tree/secure-boot.v4

v4 chagnes:
 - "EmbeddedPkg: Add AllocateRuntimePages in PrePiMemoryAllocationLib" is
   missed in v3. It is added in this version.
 - No other changes.

v3 changes:
 - Renamed TdxValidateCfv to PlatformValidateNvVarStore and implemented
   in PlatformInitlLib/Platform.c.
 - Shortcut ConnectNvVarsToFileSystem in secure-boot.
 - Other minor changes, such as adding log in
   PlatformInitEmuVariableNvStore.

v2 changes:
 - The v1 title is "Enable Secure-Boot in Tdx guest". Because the
   patch-setwe was first designed to fix the gap when secure-boot feature
   was enabled in Tdx guest. After discussing with the community (see
   the disuccsions under https://edk2.groups.io/g/devel/message/90589)
   this patch-set can fix the secure-boot issue when OVMF is lauched
   with -bios parameter. So the title is updated.
 - Add a new function (AllocateRuntimePages) in PrePiMemoryAllocationLib.
 - Add build-flag SECURE_BOOT_FEATURE_ENABLED to control the copy over
   of OVMF_VARS.fd to EmuVariableNvStore.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Abner Chang <abner.chang@hpe.com>
Cc: Daniel Schaefer <daniel.schaefer@hpe.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com> [jejb]
Cc: Jiewen Yao <jiewen.yao@intel.com> [jyao1]
Cc: Tom Lendacky <thomas.lendacky@amd.com> [tlendacky]
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

Min M Xu (8):
  EmbeddedPkg: Add AllocateRuntimePages in PrePiMemoryAllocationLib
  OvmfPkg/PeilessStartupLib: Delete TdxValidateCfv
  OvmfPkg/PlatformInitLib: Add functions for EmuVariableNvStore
  OvmfPkg/PlatformPei: Update ReserveEmuVariableNvStore
  OvmfPkg: Reserve and init EmuVariableNvStore in Pei-less Startup
  OvmfPkg/NvVarsFileLib: Shortcut ConnectNvVarsToFileSystem in
    secure-boot
  OvmfPkg/TdxDxe: Set PcdEmuVariableNvStoreReserved
  OvmfPkg: Add build-flag SECURE_BOOT_FEATURE_ENABLED

 EmbeddedPkg/Include/Library/PrePiLib.h        |  19 ++
 .../MemoryAllocationLib.c                     |  64 +++--
 OvmfPkg/CloudHv/CloudHvX64.dsc                |   9 +
 OvmfPkg/Include/Library/PlatformInitLib.h     |  51 ++++
 OvmfPkg/IntelTdx/IntelTdxX64.dsc              |   9 +
 OvmfPkg/Library/NvVarsFileLib/NvVarsFileLib.c |   7 +
 OvmfPkg/Library/PeilessStartupLib/IntelTdx.c  | 153 -----------
 .../PeilessStartupLib/PeilessStartup.c        |  15 +-
 .../PeilessStartupInternal.h                  |  17 --
 OvmfPkg/Library/PlatformInitLib/Platform.c    | 238 ++++++++++++++++++
 .../PlatformInitLib/PlatformInitLib.inf       |   3 +
 OvmfPkg/OvmfPkgIa32.dsc                       |   9 +
 OvmfPkg/OvmfPkgIa32X64.dsc                    |   9 +
 OvmfPkg/OvmfPkgX64.dsc                        |   9 +
 OvmfPkg/PlatformPei/Platform.c                |  25 +-
 OvmfPkg/TdxDxe/TdxDxe.c                       |   2 +
 OvmfPkg/TdxDxe/TdxDxe.inf                     |   1 +
 17 files changed, 428 insertions(+), 212 deletions(-)

-- 
2.29.2.windows.2