linux-kernel - Re: [PATCH v29 00/20] Intel SGX foundations

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Date:   Wed, 29 Apr 2020 08:22:01 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Connor Kuehl <ckuehl@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, bp@...en8.de, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
        cedric.xing@...el.com, puiterwijk@...hat.com
Subject: Re: [PATCH v29 00/20] Intel SGX foundations

On Wed, Apr 22, 2020 at 09:48:58AM -0700, Connor Kuehl wrote:
> On 4/21/20 2:52 PM, Jarkko Sakkinen wrote:
> > v29:
> > * The selftest has been moved to selftests/sgx. Because SGX is an execution
> >    environment of its own, it really isn't a great fit with more "standard"
> >    x86 tests.
> > 
> >    The RSA key is now generated on fly and the whole signing process has
> >    been made as part of the enclave loader instead of signing the enclave
> >    during the compilation time.
> > 
> >    Finally, the enclave loader loads now the test enclave directly from its
> >    ELF file, which means that ELF file does not need to be coverted as raw
> >    binary during the build process.
> > * Version the mm_list instead of using on synchronize_mm() when adding new
> >    entries. We hold the write lock for the mm_struct, and dup_mm() can thus
> >    deadlock with the page reclaimer, which could hold the lock for the old
> >    mm_struct.
> > * Disallow mmap(PROT_NONE) from /dev/sgx. Any mapping (e.g. anonymous) can
> >    be used to reserve the address range. Now /dev/sgx supports only opaque
> >    mappings to the (initialized) enclave data.
> > * Make the vDSO callable directly from C by preserving RBX and taking leaf
> >    from RCX.
> 
> Hi all,
> 
> I've been producing Fedora 32 kernel builds with the SGX patches applied for
> a few of weeks and I've just produced a build with this latest revision[1].
> We've been using these kernels to enable SGX for some of our
> development/test machines.

Thanks a lot!

/Jarkko