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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Jethro Beekman <jethro@fortanix.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-sgx@vger.kernel.org, akpm@linux-foundation.org,
	dave.hansen@intel.com, sean.j.christopherson@intel.com,
	nhorman@redhat.com, npmccallum@redhat.com,
	haitao.huang@intel.com, andriy.shevchenko@linux.intel.com,
	tglx@linutronix.de, kai.svahn@intel.com, bp@alien8.de,
	josh@joshtriplett.org, luto@kernel.org, kai.huang@intel.com,
	rientjes@google.com, cedric.xing@intel.com,
	puiterwijk@redhat.com, linux-security-module@vger.kernel.org,
	Suresh Siddha <suresh.b.siddha@intel.com>,
	Haitao Huang <haitao.huang@linux.intel.com>
Subject: Re: [PATCH v26 10/22] x86/sgx: Linux Enclave Driver
Date: Sat, 15 Feb 2020 09:32:34 +0200
Message-ID: <20200215073234.GD9958@linux.intel.com> (raw)
In-Reply-To: <d17c50a7-6900-731b-43a2-d6e49b8eb44d@fortanix.com>

On Thu, Feb 13, 2020 at 02:59:52PM +0100, Jethro Beekman wrote:
> Besides only partially measuring a page, there are some other fringe
> cases that are technically possible, although I haven't seen any
> toolchains that do that. These include not interleaving EADD and
> EEXTEND, not using logical ordering for the EEXTENDs, and call EEXTEND
> multiple times on the same chunk. Maximum interoperability would
> require supporting any EADD/EEXTEND sequence.

The reason why EEXTEND deals with chunks is nothing to do with the
granularity but just to amortize the algorithm. I did ask about this
and this is the answer that I got.

I think it is perfectly sane for Linux to define ABI here in at this
level.

> Tested-by: Jethro Beekman <jethro@fortanix.com>

Thanks you.

> Sorry for being super late with this, I know you asked me for feedback
> about this specific point in October. However, I did previously
> mention several times that being able to measure individual 256-byte
> chunks is necessary.

NP.

/Jarkko

  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200209212609.7928-1-jarkko.sakkinen@linux.intel.com>
2020-02-09 21:25 ` Jarkko Sakkinen
2020-02-13 13:59   ` Jethro Beekman
2020-02-13 18:07     ` Sean Christopherson
2020-02-14  9:24       ` Jethro Beekman
2020-02-14 17:11         ` Sean Christopherson
2020-02-14 17:40           ` Andy Lutomirski
2020-02-14 17:52             ` Sean Christopherson
2020-02-15 16:56               ` Andy Lutomirski
2020-02-18 22:12                 ` Sean Christopherson
2020-02-15 18:05           ` Dr. Greg
2020-02-15  7:32     ` Jarkko Sakkinen [this message]
2020-02-15  7:35       ` Jarkko Sakkinen
2020-02-19  3:26   ` Jordan Hand
2020-02-20 18:13     ` Sean Christopherson
2020-02-20 18:33       ` Jordan Hand
2020-02-20 18:48         ` Sean Christopherson
2020-02-20 22:16           ` Jarkko Sakkinen
2020-02-21  0:11             ` Jordan Hand
2020-02-21 12:53               ` Jarkko Sakkinen
2020-02-21  0:32             ` Andy Lutomirski
2020-02-21 13:01               ` Jarkko Sakkinen
2020-02-20 18:51       ` Andy Lutomirski
2020-02-20 19:15         ` Sean Christopherson
2020-02-20 22:10     ` Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 13/22] x86/sgx: Add provisioning Jarkko Sakkinen
2020-02-13 10:49   ` Jethro Beekman
2020-02-15  7:25     ` Jarkko Sakkinen

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