Re: [PATCH v5 11/11] intel_sgx: driver documentation

[Sean Christopherson]

On Tue, 2017-11-21 at 01:08 +0200, Jarkko Sakkinen wrote:
> On Sat, Nov 18, 2017 at 12:34:33AM +0100, Thomas Gleixner wrote:
> > 
> > This is architecural. From the cursory read of that series it seems there
> > are two parts to it:
> > 
> > Â 1) The actual core handling, which should be in arch/x86 because that
> > ÂÂÂÂÂhardly qualifies as a 'platform' device driver.
> > 
> > Â 2) The user space interface, which can be separated out perhaps.
> > 
> > I don't know how intertwingled they are, but that's hard to tell from the
> > actual patches w/o doing a deep inspection. Jarkko should be able to answer
> > that.
> > 
> > Thanks,
> > 
> > 	tglx
> Darren, tglx,
> 
> You can leave user space device as separate module as sgx_ioctl.c merely
> calls stuff that I have inside sgx_encl.c. VMA creation is bound to file
> operations.
> 
> My questions would be:
> 
> 1. What is your recommendation on the deployment under arch/x86?
> 2. Which parts should be compilable as a LKM? Only the user interface
> ÂÂÂor both parts?
> 
> /Jarkko

To enable KVM and a cgroup for EPC accounting, at a minimum arch/x86 needs to
manage the EPC pages (alloc/free/lrus/reclaim/etc...) and LE hash MSRs. ÂIMO,
ideally everything else would be left in the device driver, e.g. anything
involving ENCLS. ÂKeeping the majority of the driver out of arch/x86 minimizes
the footprint in arch/x86 and thereby the size of KVM's dependency required to
virtualize SGX, and allows the various SGX pieces, e.g. arch, driver and KVM, to
evolve more independently.

Preferably theÂarch/x86 code would not be a loadable module, e.g. to simplify
KVM support.

I have aÂbranch based on Jarkko's patches (I believe it's up-to-date with v5)
that implements what I described. ÂI'd be happy to send RFC patches if that
would help.


Branches for those interested:

https://github.com/sean-jc/linux.gitÂsgx/arch  - move core EPC to arch/x86
https://github.com/sean-jc/linux.gitÂsgx/kvm  Â- KVM support for SGX
https://github.com/sean-jc/linux.gitÂsgx/lc   - KVM support for Launch Control
https://github.com/sean-jc/linux.gitÂsgx/cgroup - EPC cgroup


branch relationships:

  Jarkko's patches
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ÂÂÂÂÂÂÂÂÂsgx/arch
ÂÂÂÂÂÂÂÂ/ÂÂÂÂÂÂÂÂ\
ÂÂÂÂÂsgx/kvmÂÂÂÂsgx/cgroup
ÂÂÂÂÂÂ/
ÂÂÂsgx/lc