[PATCH v1 18/18] docs: domain: Add documentation for Intel TDX guest
Signed-off-by: Zhenzhong Duan <zhenzhong.duan(a)intel.com>
---
docs/formatdomain.rst | 63 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index 41fccfeb84..ff8b1ba4cb 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -9485,6 +9485,69 @@ The ``<launchSecurity/>`` element then accepts the following
child elements:
the SNP_LAUNCH_FINISH command in the SEV-SNP firmware ABI.
+The contents of the ``<launchSecurity type='tdx'>`` element is used to
provide
+the guest owners input used for creating an encrypted VM using the Intel TDX
+(Trusted Domain eXtensions). Intel TDX refers to an Intel technology that
+extends Virtual Machine Extensions (VMX) and Multi-Key Total Memory Encryption
+(MKTME) with a new kind of virtual machine guest called a Trust Domain (TD).
+A TD runs in a CPU mode that is designed to protect the confidentiality of its
+memory contents and its CPU state from any other software, including the hosting
+Virtual Machine Monitor (VMM), unless explicitly shared by the TD itself.
+Example configuration:
+
+::
+
+ <domain>
+ ...
+ <launchSecurity type='tdx'>
+ <policy>0x10000001</policy>
+ <mrConfigId>xxx</mrConfigId>
+ <mrOwner>xxx</mrOwner>
+ <mrOwnerConfig>xxx</mrOwnerConfig>
+ <quoteGenerationSocket path="/var/run/tdx-qgs/qgs.socket"/>
+ </launchSecurity>
+ ...
+ </domain>
+
+``policy``
+ The optional ``policy`` element provides the guest TD attributes which is
+ passed by the host VMM as a guest TD initialization parameter as part of
+ TD_PARAMS, it exactly matches the definition of TD_PARAMS.ATTRIBUTES in
+ (Intel TDX Module Spec Table 22.2: ATTRIBUTES Definition). It is reported
+ to the guest TD by TDG.VP.INFO and as part of TDREPORT_STRUCT returned by
+ TDG.MR.REPORT. The guest policy is 64bit unsigned with the fields shown
+ in Table:
+
+ ======
====================================================================================
+ Bit(s) Description
+ ======
====================================================================================
+ 0 Guest TD runs in off-TD debug mode when set
+ 1:27 reserved
+ 28 Disable EPT violation conversion to #VE on guest TD access of PENDING pages
when set
+ 29:63 reserved
+ ======
====================================================================================
+
+``mrConfigId``
+ The optional ``mrConfigId`` element provides ID for non-owner-defined
+ configuration of the guest TD, e.g., run-time or OS configuration
+ (base64 encoded SHA384 digest).
+
+``@mrowner``
+ The optional ``@mrowner`` element provides ID for the guest TD’s owner
+ (base64 encoded SHA384 digest).
+
+``mrownerconfig``
+ The optional ``mrownerconfig`` element provides ID for owner-defined
+ configuration of the guest TD, e.g., specific to the workload rather than
+ the run-time or OS (base64 encoded SHA384 digest).
+
+``quoteGenerationSocket``
+ The optional ``quoteGenerationSocket`` subelement provides Quote Generation
+ Service(QGS) daemon socket address configuration. It includes an optional
+ ``path`` attribute to determine the UNIX socket address, when omitted,
+ ``/var/run/tdx-qgs/qgs.socket`` is used as default. User in TD guest cannot
+ get TD quoting for attestation if this subelement is not provided.
+
Example configs
===============
--
2.34.1