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

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Message-ID: <04f9a748-fe61-439c-af80-59c498970580@intel.com>
Date: Wed, 28 Jan 2026 15:04:55 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Chao Gao <chao.gao@...el.com>, linux-coco@...ts.linux.dev,
 linux-kernel@...r.kernel.org, kvm@...r.kernel.org, x86@...nel.org
Cc: 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 07/26] x86/virt/seamldr: Introduce a wrapper for
 P-SEAMLDR SEAMCALLs

On 1/23/26 06:55, Chao Gao wrote:
> SEAMRET from the P-SEAMLDR clears the current VMCS structure pointed 
> to by the current-VMCS pointer. A VMM that invokes the P-SEAMLDR
> using SEAMCALL must reload the current-VMCS, if required, using the
> VMPTRLD instruction.

That seems pretty mean.

This is going to need a lot more justification for why this is an
absolutely necessary requirement.

KVM folks, are you OK with this?