linux-kernel - Re: [PATCH v5 3/5] x86/tdx: Add tdx_mcall_extend

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Message-ID: <615afc41-2044-46ab-b171-4c9e039e11ff@intel.com>
Date: Thu, 1 May 2025 10:28:05 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Cedric Xing <cedric.xing@...el.com>,
 Dan Williams <dan.j.williams@...el.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev,
 Dionna Amalie Glaze <dionnaglaze@...gle.com>,
 Guorui Yu <guorui.yu@...ux.alibaba.com>,
 James Bottomley <James.Bottomley@...senPartnership.com>,
 Dan Middleton <dan.middleton@...ux.intel.com>,
 Mikko Ylinen <mikko.ylinen@...ux.intel.com>,
 Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH v5 3/5] x86/tdx: Add tdx_mcall_extend_rtmr() interface

On 4/24/25 13:12, Cedric Xing wrote:
> The TDX guest exposes one MRTD (Build-time Measurement Register) and four
> RTMR (Run-time Measurement Register) registers to record the build and boot
> measurements of a virtual machine (VM). These registers are similar to PCR
> (Platform Configuration Register) registers in the TPM (Trusted Platform
> Module) space. This measurement data is used to implement security features
> like attestation and trusted boot.
> 
> To facilitate updating the RTMR registers, the TDX module provides support
> for the `TDG.MR.RTMR.EXTEND` TDCALL which can be used to securely extend
> the RTMR registers.
> 
> Add helper function to update RTMR registers. It will be used by the TDX
> guest driver in enabling RTMR extension support.

Thank you for revising the changelogs to make the underlying purpose of
this series more clear.

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>