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Date: Thu, 6 Jun 2024 09:49:19 -0700
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Subject: Re: [PATCH v9 04/19] x86: Secure Launch Resource Table header file
To: Jarkko Sakkinen <jarkko@kernel.org>, linux-kernel@vger.kernel.org,
        x86@kernel.org, linux-integrity@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org,
        kexec@lists.infradead.org, linux-efi@vger.kernel.org,
        iommu@lists.linux-foundation.org
Cc: dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com,
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        ardb@kernel.org, mjg59@srcf.ucam.org,
        James.Bottomley@hansenpartnership.com, peterhuewe@gmx.de, jgg@ziepe.ca,
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        herbert@gondor.apana.org.au, davem@davemloft.net, corbet@lwn.net,
        ebiederm@xmission.com, dwmw2@infradead.org, baolu.lu@linux.intel.com,
        kanth.ghatraju@oracle.com, andrew.cooper3@citrix.com,
        trenchboot-devel@googlegroups.com, ross.philipson@oracle.com
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On 6/5/24 11:02 PM, Jarkko Sakkinen wrote:
> On Wed Jun 5, 2024 at 10:03 PM EEST,  wrote:
>> So I did not mean to imply that DRTM support on various
>> platforms/architectures has a short expiration date. In fact we are
>> actively working on DRTM support through the TrenchBoot project on
>> several platforms/architectures. Just a quick rundown here:
>>
>> Intel: Plenty of Intel platforms are vPro with TXT. It is really just
>> the lower end systems that don't have it available (like Core i3). And
>> my guess was wrong about x86s. You can find the spec on the page in the
>> following link. There is an entire subsection on SMX support on x86s and
>> the changes to the various GETSEC instruction leaves that were made to
>> make it work there (see 3.15).
>>
>> https://urldefense.com/v3/__https://www.intel.com/content/www/us/en/developer/articles/technical/envisioning-future-simplified-architecture.html__;!!ACWV5N9M2RV99hQ!Lt-srkRLHstA9PPCB-NWogvHP-9mfh2bHjkml-lARY79BhYlWJjhrHb6RyCN_WdGstcABq1FdqPUKn5dCdw$
> 
> Happend to bump into same PDF specification and exactly the seeked
> information is "3.15 SMX Changes". So just write this down to some
> patch that starts adding SMX things.
> 
> Link: https://urldefense.com/v3/__https://cdrdv2.intel.com/v1/dl/getContent/776648__;!!ACWV5N9M2RV99hQ!Lt-srkRLHstA9PPCB-NWogvHP-9mfh2bHjkml-lARY79BhYlWJjhrHb6RyCN_WdGstcABq1FdqPUuZy8Sfk$
> 
> So link and document, and other stuff above is not relevant from
> upstream context, only potential maintenance burden :-)

I am not 100% sure what you mean exactly here...

> 
> For any architectures dig a similar fact:
> 
> 1. Is not dead.
> 2. Will be there also in future.
> 
> Make any architecture existentially relevant for and not too much
> coloring in the text that is easy to check.
> 
> It is nearing 5k lines so you should be really good with measured
> facts too (not just launch) :-)

... but overall I get your meaning. We will spend time on this sort of 
documentation for the v10 release.

Thanks for the feedback,
Ross

> 
> BR, Jarkko
>