linux-kernel - Re: [PATCH v3 16/26] x86/virt/seamldr: Shut down the current TDX module

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Message-ID: <aXdE-BjIHZ9aYC6a@tlindgre-MOBL1>
Date: Mon, 26 Jan 2026 12:42:00 +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,
	Farrah Chen <farrah.chen@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v3 16/26] x86/virt/seamldr: Shut down the current TDX
 module

On Fri, Jan 23, 2026 at 06:55:24AM -0800, Chao Gao wrote:
> TDX Module updates request shutting down the existing TDX module.
> During this shutdown, the module generates hand-off data, which captures
> the module's states essential for preserving running TDs. The new TDX
> Module can utilize this hand-off data to establish its states.
> 
> Invoke the TDH_SYS_SHUTDOWN SEAMCALL on one CPU to perform the shutdown.
> This SEAMCALL requires a hand-off module version. Use the module's own
> hand-off version, as it is the highest version the module can produce and
> is more likely to be compatible with new modules as new modules likely have
> higher hand-off version.

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