linux-kernel - Re: [PATCH v3 06/26] x86/virt/tdx: Prepare to support P-SEAMLDR SEAMCALLs

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Message-ID: <988f0c43-3335-4673-b0a3-ef587a1f904d@linux.intel.com>
Date: Wed, 28 Jan 2026 13:58:37 +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,
 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 06/26] x86/virt/tdx: Prepare to support P-SEAMLDR
 SEAMCALLs

On 1/23/2026 10:55 PM, Chao Gao wrote:
> P-SEAMLDR is another component alongside the TDX module within the
> protected SEAM range. P-SEAMLDR can update the TDX module at runtime.
> Software can talk with P-SEAMLDR via SEAMCALLs with the bit 63 of RAX
> (leaf number) set to 1 (a.k.a P-SEAMLDR SEAMCALLs).
> 
> P-SEAMLDR SEAMCALLs differ from SEAMCALLs of the TDX module in terms of
> error codes and the handling of the current VMCS.
> 
> In preparation for adding support for P-SEAMLDR SEAMCALLs, do the two
> following changes to SEAMCALL low-level helpers:
> 
> 1) Tweak sc_retry() to retry on "lack of entropy" errors reported by
>    P-SEAMLDR because it uses a different error code.
> 
> 2) Add seamldr_err() to log error messages on P-SEAMLDR SEAMCALL failures.
> 
> Signed-off-by: Chao Gao <chao.gao@...el.com>
> Tested-by: Farrah Chen <farrah.chen@...el.com>

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