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Subject: Re: SGX feature extensions patch.
To:     "Dr. Greg" <greg@enjellic.com>, linux-kernel@vger.kernel.org,
        linux-sgx@vger.kernel.org
References: <20210426094538.GA8264@wind.enjellic.com>
From:   Jia Zhang <zhang.jia@linux.alibaba.com>
Message-ID: <7d8cc81d-79cb-469f-24dd-30905c7e6e0a@linux.alibaba.com>
Date:   Wed, 28 Apr 2021 11:07:34 +0800
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Hi Dr.Greg,

Thanks for your great job! I have a question about how do you work out
psw for
non-flc platforms?

The background is that we (inclavare containers project:
https://github.com/alibaba/inclavare-containers)
also attempt to resolve the conflict between non-flc platform and sgx
in-tree driver.
Our work is available at
https://github.com/alibaba/inclavare-containers/tree/master/hack/no-sgx-flc

In addition, I compare the different parts between us for non-flc
support part:
- Use different ioctl cmd to support init-token ioctl with token
supplied by caller
- Use different init-token ioctl structure (w/ vs w/o address parameter
in ELRANGE)

We did the testing on sgx1 machine and found it is required to modify
psw. See
https://github.com/alibaba/inclavare-containers/blob/master/hack/no-sgx-flc/Linux-SGX-PSW-2.13-Support-SGX1-machine-with-SGX-in-tree-driver.patch

So we are interested how do you avoid to modify PSW to work out.

Cheers,
Jia
On 2021/4/26 下午5:45, Dr. Greg wrote:
> Good morning, I hope the week is starting well for everyone.
>
> With the SGX driver having been mainlined in the 5.11 release we will
> be maintaining and releasing our out-of-tree SGX feature extension
> patch for each kernel release.
>
> The patches will be available using the following URL format:
>
> ftp://ftp.enjellic.com/pub/sgx/kernel/SFLC-MAJOR.MINOR.patch
>
> With the detached signature available via the following URL:
>
> ftp://ftp.enjellic.com/pub/sgx/kernel/SFLC-MAJOR.MINOR.patch.asc
>
> The 5.11 patch and signature can thus be retrieved via the following
> URL's:
>
> ftp://ftp.enjellic.com/pub/sgx/kernel/SFLC-5.11.patch
>
> ftp://ftp.enjellic.com/pub/sgx/kernel/SFLC-5.11.patch.asc
>
> I've included the public signing key that is being used for the
> signatures at the end of this e-mail.
>
> In addition to implementing cryptographic access control policies, the
> feature extension patch allows the mainline driver to work on
> platforms that do not have Flexible Launch Control.
>
> The changelog for the patch contains documentation for how to use the
> cryptographic access control policies, along with the rationale for
> enabling support for non-FLC platforms, which is basically the fact
> that with the mainline Linux driver there is very little hardware
> available to developers who would be interested in working with SGX on
> Linux.
>
> The driver extensions are unit tested on both FLC and non-FLC
> hardware.
>
> We would, of course, be interested in any productive suggestions,
> security issues or enhancement requests.  Depending on the trajectory
> of mainline development, we may add support for partial page
> initialization if that doesn't look like it is headed for mainline
> inclusion.
>
> Best wishes for a productive week.
>
> Dr. Greg
>
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>
> As always,
> Dr. Greg Wettstein, Ph.D, Worker      Autonomously self-defensive
> Enjellic Systems Development, LLC     IOT platforms and edge devices.
> 4206 N. 19th Ave.
> Fargo, ND  58102
> PH: 701-281-1686                      EMAIL: greg@enjellic.com
> ------------------------------------------------------------------------------
> "Heaven goes by favor.  If it went by merit, you would stay out and your
>  dog would go in."
>                                 -- Mark Twain