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Subject: Re: [PATCH v2 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: <da7ae1e7-59b8-63db-a9f1-607b4e529639@fortanix.com>
 <a05d07dc-1623-012c-5120-e30f64decae7@intel.com>
From:   Jethro Beekman <jethro@fortanix.com>
Message-ID: <f3366028-286a-8543-0604-3db6799364b5@fortanix.com>
Date:   Mon, 12 Apr 2021 17:58:09 +0200
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--------------ms040806030309080502020708
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: quoted-printable

On 2021-04-12 17:36, Dave Hansen wrote:
> On 4/12/21 1:59 AM, Raoul Strackx wrote:
>> This patch set adds a new ioctl to enable userspace to execute EEXTEND=

>> leaf functions per 256 bytes of enclave memory. With this patch in pla=
ce,
>> Linux will be able to build all valid SGXv1 enclaves.
>=20
> This didn't cover why we need a *NEW* ABI for this instead of relaxing
> the page alignment rules in the existing one.
>=20

In executing the ECREATE, EADD, EEXTEND, EINIT sequence, you currently ha=
ve 2 options for EADD/EEXTEND using the SGX_IOC_ENCLAVE_ADD_PAGES ioctl:
- execute EADD on any address
- execute EADD on any address followed by 16=C3=97 EEXTEND for that addre=
ss span

Could you be more specific on how you're suggesting that the current ioct=
l is modified to in addition support the following?
- execute EEXTEND on any address

--
Jethro Beekman | Fortanix


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