linux-kernel - Re: [PATCH v2 0/3] x86/sgx: eextend ioctl

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Message-ID: <f3366028-286a-8543-0604-3db6799364b5@fortanix.com>
Date:   Mon, 12 Apr 2021 17:58:09 +0200
From:   Jethro Beekman <jethro@...tanix.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Raoul Strackx <raoul.strackx@...tanix.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] x86/sgx: eextend ioctl

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 place,
>> Linux will be able to build all valid SGXv1 enclaves.
> 
> This didn't cover why we need a *NEW* ABI for this instead of relaxing
> the page alignment rules in the existing one.
> 

In executing the ECREATE, EADD, EEXTEND, EINIT sequence, you currently have 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× EEXTEND for that address span

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

--
Jethro Beekman | Fortanix


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