linux-kernel - Re: [PATCH v17 18/23] platform/x86: Intel SGX driver

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Date:   Mon, 17 Dec 2018 06:27:21 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     "Dr. Greg" <greg@...ellic.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-sgx@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        nhorman@...hat.com, npmccallum@...hat.com,
        "Ayoun, Serge" <serge.ayoun@...el.com>, shay.katz-zamir@...el.com,
        haitao.huang@...ux.intel.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Svahn, Kai" <kai.svahn@...el.com>, mark.shanahan@...el.com,
        Suresh Siddha <suresh.b.siddha@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, jethro@...tanix.com
Subject: Re: [PATCH v17 18/23] platform/x86: Intel SGX driver

On Sat, Dec 15, 2018 at 05:22:31PM -0600, Dr. Greg wrote:
> On Fri, Dec 14, 2018 at 04:06:27PM -0800, Sean Christopherson wrote:
> 
> Good afternoon, I hope the weekend is going well for everyone.
> 
> > On Fri, Dec 14, 2018 at 05:59:17PM -0600, Dr. Greg wrote:
> > > On Wed, Dec 12, 2018 at 08:00:36PM +0200, Jarkko Sakkinen wrote:
> > > 
> > > Good evening, I hope the week has gone well for everyone.
> > > 
> > > > On Mon, Dec 10, 2018 at 04:49:08AM -0600, Dr. Greg wrote:
> > > > > In the meantime, I wanted to confirm that your jarkko-sgx/master
> > > > > branch contains the proposed driver that is headed upstream.
> > > > > Before adding the SFLC patches we thought it best to run the
> > > > > driver through some testing in order to verify that any problems
> > > > > we generated where attributable to our work and not the base
> > > > > driver.
> > > >
> > > > The master branch is by definition unstable at the moment i.e. it
> > > > can sometimes (not often) contain unfinished changes. Use next for
> > > > testing.  I update next when I consider the master contents "stable
> > > > enough".
> > > 
> > > I noticed in the last day or so that you appeared to sync
> > > jarkko-sgx/master with jarkko-sgx/next, so I checked out a local
> > > branch against jarkko-sgx/next and ran it against our unit tests.
> > > Based on what we are seeing the driver is still experiencing issues
> > > with initialization of a non-trivial enclave.
> 
> > master branch is broken, looks like the VMA code Jarkko is reworking is
> > buggy.  I should be able to help debug this next week.
> > 
> > [  504.149548] ------------[ cut here ]------------
> > [  504.149550] kernel BUG at /home/sean/go/src/kernel.org/linux/mm/mmap.c:669!
> 
> Rodger, dodger.
> 
> Let us know when you think you have something working pushed up into
> one of the branches and we will put it on the bench here in the lab
> and see what our runtime is able to do with it.
> 
> BTW, your new vDSO work appears to be shaping up well.  Just out of
> curiosity though, how are you testing and validating the new vDSO
> based exception handler if it isn't possible to initialize and run an
> enclave with the new driver?

Cherry-pick the patches to a stable version of the driver, the vDSO code
doesn't use any of the SGX APIs.