OvmfPkg/IntelTdx: Update README

TDVF's README is updated based on the latest feature.
 - RTMR based measurement is supported in OvmfPkgX64 (Config-A)
 - Features of Config-B have all been implemented, such as removing
   unnecessary attack surfaces.

Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Michael Roth <michael.roth@amd.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/OvmfPkg/IntelTdx/README b/OvmfPkg/IntelTdx/README
index cc01ebca5c0a04f5dfbb7f54d9fea1313d34bfce..7307ede78fafea71d25abf258753f99cef5275c9 100644 (file)
--- a/OvmfPkg/IntelTdx/README
+++ b/OvmfPkg/IntelTdx/README
@@ -26,17 +26,19 @@ There are 2 configurations for TDVF.
  - The OvmfX64Pkg.dsc includes SEV/TDX/normal OVMF basic boot capability.\r
    The final binary can run on SEV/TDX/normal OVMF.\r
  - No changes to existing OvmfPkgX64 image layout.\r
- - No need to add additional security features if they do not exist today.\r
  - No need to remove features if they exist today.\r
- - RTMR is not supported.\r
  - PEI phase is NOT skipped in either Td or Non-Td.\r
+ - RTMR based measurement is supported.\r
+ - External inputs from Host VMM are measured, such as TdHob, CFV.\r
+ - Other external inputs are measured, such as FW_CFG data, os loader,\r
+   initrd, etc.\r
 \r
 <b>Config-B:</b>\r
- - (*) Add a standalone IntelTdx.dsc to a TDX specific directory for a *full*\r
+ - Add a standalone IntelTdx.dsc to a TDX specific directory for a *full*\r
    feature TDVF.(Align with existing SEV)\r
- - (*) Threat model: VMM is out of TCB. (We need necessary change to prevent\r
+ - Threat model: VMM is out of TCB. (We need necessary change to prevent\r
    attack from VMM)\r
- - (*) IntelTdx.dsc includes TDX/normal OVMF basic boot capability. The final\r
+ - IntelTdx.dsc includes TDX/normal OVMF basic boot capability. The final\r
    binary can run on TDX/normal OVMF.\r
  - It might eventually merge with AmdSev.dsc, but NOT at this point of\r
    time. And we don?t know when it will happen. We need sync with AMD in\r
@@ -48,13 +50,6 @@ There are 2 configurations for TDVF.
    initrd, etc.\r
  - Need to remove unnecessary attack surfaces, such as network stack.\r
 \r
-In current stage, <b>Config-A</b> has been merged into edk2-master branch.\r
-The corresponding pkg file is OvmfPkg/OvmfPkgX64.dsc.\r
-\r
-<b>Config-B</b> is split into several waves. The corresponding pkg file is\r
-OvmfPkg/IntelTdx/IntelTdxX64.dsc. The features with (*) have been implemented\r
-and merged into edk2-master branch. Others are in upstreaming progress.\r
-\r
 Build\r
 ------\r
 - Build the TDVF (Config-A) target:\r