linux-kernel - Re: [PATCH v3 24/26] x86/virt/seamldr: Extend sigstruct to 16KB

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Message-ID: <aXdM411oUrKUYf4n@tlindgre-MOBL1>
Date: Mon, 26 Jan 2026 13:15:47 +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,
	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 24/26] x86/virt/seamldr: Extend sigstruct to 16KB

On Fri, Jan 23, 2026 at 06:55:32AM -0800, Chao Gao wrote:
> Currently, each TDX Module has a 4KB sigstruct that is passed to the
> P-SEAMLDR during module updates to authenticate the TDX Module binary.
> 
> Future TDX Module versions will pack additional information into the
> sigstruct, which will exceed the current 4KB size limit.
> 
> To accommodate this, the sigstruct is being extended to support up to
> 16KB. Update seamldr_params and tdx-blob structures to handle the larger
> sigstruct size.

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