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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
References: <9688abee-6ba7-e1d9-701e-a5cabac36269@fortanix.com>
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 <0498080e-6fdc-ed6d-8efa-d9c3265fe7e5@intel.com>
 <9d15aae0-078a-ed72-6c14-155cd1bf27c5@fortanix.com>
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From:   Jethro Beekman <jethro@fortanix.com>
Message-ID: <f94e05f7-e6d0-9253-d74c-09cd200702af@fortanix.com>
Date:   Fri, 2 Apr 2021 10:38:19 +0200
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--------------ms040403060606040705060809
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On 2021-04-01 20:40, Dave Hansen wrote:
> On 4/1/21 10:49 AM, Raoul Strackx wrote:
>> On 4/1/21 6:11 PM, 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 l=
eaf=20
>>>> functions per 256 bytes of enclave memory. This enables enclaves to =
be=20
>>>> build as specified by enclave providers.
>>> I think tying the user ABI to the SGX architecture this closely is a
>>> mistake.
>>>
>>> Do we need another ioctl() or can we just relax the existing add_page=
s
>>> ioctl() to allow unaligned addresses?
>>>
>> I've considered this. In order to do an EEXTEND without an EADD, we'd
>> need to add a flag DONT_ADD_PAGES flag to `add_pages` ioctl as well. T=
wo
>> separate ioctls, one for adding, another for extending made more sense=

>> to me.
>=20
> So, we're talking here about pages that have been EEADDED, but for whic=
h
> we do not want to include the entire contents of the page?  Do these
> contents always include the beginning of the page, or can the holes be
> anywhere?

Holes can be anywhere, and EEXTEND calls need not be sequential in memory=
 address or even relate to the most recently EADDed page.

--
Jethro Beekman | Fortanix


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