linux-kernel - Re: [PATCH v3 26/26] coco/tdx-host: Set and document TDX Module update expectations

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Message-ID: <aXdPwRtsj1Qj9VLi@tlindgre-MOBL1>
Date: Mon, 26 Jan 2026 13:28:01 +0200
From: Tony Lindgren <tony.lindgren@...ux.intel.com>
To: Chao Gao <chao.gao@...el.com>
Cc: linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, x86@...nel.org, reinette.chatre@...el.com,
	ira.weiny@...el.com, kai.huang@...el.com, dan.j.williams@...el.com,
	yilun.xu@...ux.intel.com, sagis@...gle.com, vannapurve@...gle.com,
	paulmck@...nel.org, nik.borisov@...e.com, zhenzhong.duan@...el.com,
	seanjc@...gle.com, rick.p.edgecombe@...el.com, kas@...nel.org,
	dave.hansen@...ux.intel.com, vishal.l.verma@...el.com
Subject: Re: [PATCH v3 26/26] coco/tdx-host: Set and document TDX Module
 update expectations

On Fri, Jan 23, 2026 at 06:55:34AM -0800, Chao Gao wrote:
> In rare cases, TDX Module updates may cause TD management operations to
> fail if they occur during phases of the TD lifecycle that are sensitive
> to update compatibility.
> 
> But not all combinations of P-SEAMLDR, kernel, and TDX Module have the
> capability to detect and prevent said incompatibilities. Completely
> disabling TDX Module updates on platforms without the capability would
> be overkill, as these incompatibility cases are rare and can be
> addressed by userspace through coordinated scheduling of updates and TD
> management operations.
> 
> To set clear expectations for TDX Module updates, expose the capability
> to detect and prevent these incompatibility cases via sysfs and
> document the compatibility criteria and indications when those criteria
> are violated.

Reviewed-by: Tony Lindgren <tony.lindgren@...ux.intel.com>