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Date:   Tue, 4 Jun 2019 14:55:01 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@intel.com>
Cc:     Andy Lutomirski <luto@kernel.org>,
        Cedric Xing <cedric.xing@intel.com>,
        Stephen Smalley <sds@tycho.nsa.gov>,
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        "Serge E . Hallyn" <serge@hallyn.com>,
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        Paul Moore <paul@paul-moore.com>,
        Eric Paris <eparis@parisplace.org>, selinux@vger.kernel.org,
        Jethro Beekman <jethro@fortanix.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Haitao Huang <haitao.huang@intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
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        William Roberts <william.c.roberts@intel.com>,
        Philip Tricca <philip.b.tricca@intel.com>
Subject: Re: [RFC PATCH 3/9] x86/sgx: Allow userspace to add multiple pages
 in single ioctl()
Message-ID: <20190604115501.GD30594@linux.intel.com>
References: <20190531233159.30992-1-sean.j.christopherson@intel.com>
 <20190531233159.30992-4-sean.j.christopherson@intel.com>
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On Fri, May 31, 2019 at 04:31:53PM -0700, Sean Christopherson wrote:
> ...to improve performance when building enclaves by reducing the number
> of user<->system transitions.  Rather than provide arbitrary batching,
> e.g. with per-page SECINFO and mrmask, take advantage of the fact that
> any sane enclave will have large swaths of pages with identical
> properties, e.g. code vs. data sections.
> 
> For simplicity and stability in the initial implementation, loop over
> the existing add page flow instead of taking a more agressive approach,
> which would require tracking transitions between VMAs and holding
> mmap_sem for an extended duration.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>

I think this completely ruins the rest of the series. We should first
get the model for security done (including documentation). I would even
send v21 with just that update because this series does not even apply
to the mainline.

I would request an update to the series with just the change to the
security model. Also the very first should be dropped as it is
completely unrelated cosmetic fix.

/Jarkko