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Subject: Re: [PATCH RESEND 0/3] x86/sgx: eextend ioctl
To:     Dave Hansen <dave.hansen@intel.com>,
        Raoul Strackx <raoul.strackx@fortanix.com>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
        linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org
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From:   Jethro Beekman <jethro@fortanix.com>
Message-ID: <1101066d-7d12-420a-a2a1-08ba9fdce8bf@fortanix.com>
Date:   Thu, 1 Apr 2021 19:59:07 +0200
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--------------ms080100090003000500050802
Content-Type: text/plain; charset=utf-8
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On 2021-04-01 18:11, Dave Hansen wrote:
> On 4/1/21 7:56 AM, Raoul Strackx wrote:
>>
>> SOLUTION OF THIS PATCH
>> This patch adds a new ioctl to enable userspace to execute EEXTEND lea=
f=20
>> functions per 256 bytes of enclave memory. This enables enclaves to be=
=20
>> build as specified by enclave providers.
>=20
> I think tying the user ABI to the SGX architecture this closely is a
> mistake.
>=20
> Do we need another ioctl() or can we just relax the existing add_pages
> ioctl() to allow unaligned addresses?
>=20

Some version of the driver used to pass a 16-bit bitset of which of the 1=
6 256-byte parts of a 4096-byte page to measure. This was removed at some=
 point in favor of a separate ioctl to be added later. That is this. See =
the discussion linked in the cover letter.

--
Jethro Beekman | Fortanix


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