linux-kernel - Re: [PATCH v3 03/26] x86/virt/tdx: Move low level SEAMCALL helpers out of <asm/tdx.h>

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Message-ID: <f8329aaf-7074-4bcc-b05b-b50a639cc970@linux.intel.com>
Date: Wed, 28 Jan 2026 09:37:05 +0800
From: Binbin Wu <binbin.wu@...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 03/26] x86/virt/tdx: Move low level SEAMCALL helpers
 out of <asm/tdx.h>

On 1/23/2026 10:55 PM, Chao Gao wrote:
> From: Kai Huang <kai.huang@...el.com>
> 
> TDX host core code implements three seamcall*() helpers to make SEAMCALL
> to the TDX module.  Currently, they are implemented in <asm/tdx.h> and
> are exposed to other kernel code which includes <asm/tdx.h>.
> 
> However, other than the TDX host core, seamcall*() are not expected to
> be used by other kernel code directly.  For instance, for all SEAMCALLs
> that are used by KVM, the TDX host core exports a wrapper function for
> each of them.
> 
> Move seamcall*() and related code out of <asm/tdx.h> and make them only
> visible to TDX host core.
> 
> Since TDX host core tdx.c is already very heavy, don't put low level
> seamcall*() code there but to a new dedicated "seamcall.h".  Also,
> currently tdx.c has seamcall_prerr*() helpers which additionally print
> error message when calling seamcall*() fails.  Move them to "seamcall.h"
> as well.  In such way all low level SEAMCALL helpers are in a dedicated
> place, which is much more readable.
> 
> Signed-off-by: Kai Huang <kai.huang@...el.com>
> Signed-off-by: Chao Gao <chao.gao@...el.com>
> Reviewed-by: Zhenzhong Duan <zhenzhong.duan@...el.com>

Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>

One question below.

[...]

> diff --git a/arch/x86/virt/vmx/tdx/seamcall.h b/arch/x86/virt/vmx/tdx/seamcall.h
> new file mode 100644
> index 000000000000..0912e03fabfe
> --- /dev/null
> +++ b/arch/x86/virt/vmx/tdx/seamcall.h
> @@ -0,0 +1,99 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (C) 2025 Intel Corporation */

Should this be updated to 2026?