linux-kernel - Re: [PATCH v20 15/28] x86/sgx: Add the Linux SGX Enclave Driver

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Message-ID: <77cface6-dcc4-7e26-9910-ea9d13152531@fortanix.com>
Date:   Wed, 24 Apr 2019 01:04:21 +0000
From:   Jethro Beekman <jethro@...tanix.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
CC:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "serge.ayoun@...el.com" <serge.ayoun@...el.com>,
        "shay.katz-zamir@...el.com" <shay.katz-zamir@...el.com>,
        "haitao.huang@...el.com" <haitao.huang@...el.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "kai.svahn@...el.com" <kai.svahn@...el.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "josh@...htriplett.org" <josh@...htriplett.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "kai.huang@...el.com" <kai.huang@...el.com>,
        "rientjes@...gle.com" <rientjes@...gle.com>
Subject: Re: [PATCH v20 15/28] x86/sgx: Add the Linux SGX Enclave Driver

On 2019-04-23 17:26, Sean Christopherson wrote:
> On Tue, Apr 23, 2019 at 11:29:24PM +0000, Jethro Beekman wrote:
>> On 2019-04-22 14:58, Sean Christopherson wrote:
>>> Now that the core SGX code is approaching stability, I'd like to start
>>> sending RFCs for the EPC virtualization and KVM bits to hash out that side
>>> of things.  The ACPI crud is the last chunk of code that would require
>>> non-trivial changes to the core SGX code for the proposed virtualization
>>> implementation.  I'd strongly prefer to get it out of the way before
>>> sending the KVM RFCs.
>>
>> What kind of changes? Wouldn't KVM just be another consumer of the same API
>> used by the driver?
> 
> Nope, userspace "only" needs to be able to mmap() arbitrary chunks of EPC.

I don't think this is sufficient. Don't you need enclave tracking in 
order to support paging?

--
Jethro Beekman | Fortanix


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