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Subject: Re: [PATCH RESEND 0/3] x86/sgx: eextend ioctl
To:     Jarkko Sakkinen <jarkko@kernel.org>
Cc:     Dave Hansen <dave.hansen@intel.com>,
        Raoul Strackx <raoul.strackx@fortanix.com>,
        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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From:   Jethro Beekman <jethro@fortanix.com>
Message-ID: <7c93136a-3906-e225-3007-ebf13569ab52@fortanix.com>
Date:   Thu, 8 Apr 2021 17:07:17 +0200
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--------------ms070205080703040205080807
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On 2021-04-04 18:04, Jarkko Sakkinen wrote:
> On Fri, Apr 02, 2021 at 08:31:19PM +0200, Jethro Beekman wrote:
>> On 2021-04-02 17:53, Dave Hansen wrote:
>>> On 4/2/21 1:38 AM, Jethro Beekman wrote:
>>>>> So, we're talking here about pages that have been EEADDED, but for
>>>>> which 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.
>>>
>>> I think you're referring to the SGX architecture itself here.  The
>>> architecture permits this, right?
>>
>> Yes.
>>
>>> But, why would an enclave loader application ever do this?=20
>>
>> e.g. to save space
>>
>>> Is this something we want to support in Linux?
>>
>> Why not? Is there a good reason to not fully support this part of the =
CPU architecture?
>=20
> Yes, in generic sense :-)
>=20
> If one would disagree, that would be same as saying that everything sho=
uld
> execute in ring-0 because that only gives "full support".

How is that the same? Please make an effort to reasonably interpret what =
I'm saying.

--
Jethro Beekman | Fortanix


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