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