linux-kernel - Re: [PATCH v29 00/20] Intel SGX foundations

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Message-ID: <a9ff7817-32d1-e048-af05-862ca9f8aa46@fortanix.com>
Date:   Thu, 30 Apr 2020 09:19:48 +0200
From:   Jethro Beekman <jethro@...tanix.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, bp@...en8.de, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
        cedric.xing@...el.com, puiterwijk@...hat.com
Subject: Re: [PATCH v29 00/20] Intel SGX foundations

On 2020-04-30 05:46, Jarkko Sakkinen wrote:
> On Wed, Apr 29, 2020 at 05:27:48PM +0200, Jethro Beekman wrote:
>> On 2020-04-21 23:52, Jarkko Sakkinen wrote:
>>> Intel(R) SGX is a set of CPU instructions that can be used by applications
>>> to set aside private regions of code and data. The code outside the enclave
>>> is disallowed to access the memory inside the enclave by the CPU access
>>> control.
>>>
>>> There is a new hardware unit in the processor called Memory Encryption
>>> Engine (MEE) starting from the Skylake microacrhitecture. BIOS can define
>>> one or many MEE regions that can hold enclave data by configuring them with
>>> PRMRR registers.
>>>
>>> The MEE automatically encrypts the data leaving the processor package to
>>> the MEE regions. The data is encrypted using a random key whose life-time
>>> is exactly one power cycle.
>>>
>>> The current implementation requires that the firmware sets
>>> IA32_SGXLEPUBKEYHASH* MSRs as writable so that ultimately the kernel can
>>> decide what enclaves it wants run. The implementation does not create
>>> any bottlenecks to support read-only MSRs later on.
>>>
>>> You can tell if your CPU supports SGX by looking into /proc/cpuinfo:
>>>
>>> 	cat /proc/cpuinfo  | grep sgx
>>
>> Let's merge this.
> 
> So can I tag reviewed-by's?
> 

No, but you already have my tested-by's.

If it helps I can try to review some patches, but 1) I know nothing about kernel coding guidelines and best practices and 2) I know little about most kernel internals, so I won't be able to review every patch.

--
Jethro Beekman | Fortanix


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