linux-kernel - Re: [PATCH v3 07/26] x86/virt/seamldr: Introduce a wrapper for P-SEAMLDR SEAMCALLs

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Message-ID: <ab71da7b-3bc5-41ed-b9cc-cbf125dbb5da@intel.com>
Date: Tue, 3 Feb 2026 08:12:33 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Sean Christopherson <seanjc@...gle.com>, 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,
 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 07/26] x86/virt/seamldr: Introduce a wrapper for
 P-SEAMLDR SEAMCALLs

On 2/3/26 07:41, Sean Christopherson wrote:
>> It seems like a bug, or at least a P-SEAMLDR implementation issue the
>> needs to get fixed.
> Yeah, 'tis odd behavior.  IMO, that's all the more reason the TDX subsystem should
> hide the quirk from the rest of the kernel.
> 
> [*] https://lore.kernel.org/all/20251010220403.987927-1-seanjc@google.com

For now, I say treat it as a bug. Don't deal with it in the series.

If it truly is unfixable P-SEAMLDR behavior, then Intel can issue and
erratum for it and we can add (ugly) code to follow Sean's suggestion.