linux-kernel - Re: [PATCHv2 00/29] TDX Guest: TDX core support

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Message-Id: <20220210004831.03dea501738bee060003d040@intel.com>
Date:   Thu, 10 Feb 2022 00:48:31 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...el.com,
        luto@...nel.org, peterz@...radead.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
        joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
        pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
        tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 00/29] TDX Guest: TDX core support

On Wed, 9 Feb 2022 12:40:17 +0100 Borislav Petkov wrote:
> On Thu, Feb 10, 2022 at 12:30:33AM +1300, Kai Huang wrote:
> > Because SEAM, P-SEAMLDR can logically be independent, so I feel it's better to
> > have separate C files for them.
> 
> Most of those look like small files. I don't see the point of having it
> all in separate files - you can just as well put them in tdx.c and carve
> out only then when the file becomes too unwieldy to handle.

arch/x86/kernel/tdx.c is already taken by this series.  This is the reason that
I think perhaps it's better to rename it to reflect it is for TDX guest support.

> 
> > Thanks for the information.  However, for now does it make sense to also put
> > TDX host files under arch/x86/kernel/, or maybe arch/x86/kernel/tdx_host/?
> 
> Didn't you just read what I wrote about "kernel"?
> 
> > As suggested by Thomas, host SEAMCALL can share TDX guest's __tdx_module_call()
> > implementation.  Kirill will have a arch/x86/kernel/tdxcall.S which implements
> > the core body of __tdx_module_call() and is supposed to be included by the new
> > assembly file to implement the host SEAMCALL function.  From this perspective,
> > it seems more reasonable to just put all TDX host files under arch/x86/kernel/?
> 
> It would be a lot harder to move them to a different location later,
> when they're upstream already. I'm talking from past experience here.

Are you suggesting even for now we can start to put TDX host support to
arch/x86/coco/tdx/ ?

> 
> But let's see what the others think first.

Sure thanks for comments.

> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette