linux-kernel - Re: [PATCH v8 05/16] x86/virt/tdx: Implement functions to make SEAMCALL

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Date:   Mon, 9 Jan 2023 10:30:31 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Luck, Tony" <tony.luck@...el.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "Gao, Chao" <chao.gao@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [PATCH v8 05/16] x86/virt/tdx: Implement functions to make
 SEAMCALL

On Fri, 2023-01-06 at 09:29 -0800, Dave Hansen wrote:
> The subject here is a bit too specific.  This patch isn't just
> "implementing functions".  There are more than just functions here.  The
> best subject is probably:
> 
> 	Add SEAMCALL infrastructure

Yes this is better.  Thanks.

> 
> But that's rather generic by necessity because this patch does several
> _different_ logical things:
> 
>  * Wrap TDX_MODULE_CALL so it can be used for SEAMCALLs with host=1
>  * Add handling to TDX_MODULE_CALL to allow it to handle specifically
>    host-side error conditions
>  * Add high-level seamcall() function with actual error handling
> 
> It's probably also worth noting that the code that allows "host=1" to be
> passed to TDX_MODULE_CALL is dead code in mainline right now.  It
> probably shouldn't have been merged this way, but oh well.
> 
> I don't know that you really _need_ to split this up, but I'm just
> pointing out that mashing three different logical things together makes
> it hard to write a coherent Subject.  But, I've seen worse.

Agreed.

To me seems "Add SEAMCALL infrastructure" is good enough, but I can split up if
you want me to.