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Improve documentation for SGXSupportLevel
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Signed-off-by: Aeva Black <[email protected]>
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AevaOnline committed Feb 12, 2020
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The new Intel SGX instruction extension was introduced with 7th Generation Intel® Core™
processor platforms and Intel® Xeon® processor E3 v5 for data center servers in 2015.

First, determine which processor you have by using one of the following command to find the CPU information on your system:
- On Linux: `cat /proc/cpuinfo | grep 'model name'`
- On Windows: `msinfo32` (check the "Processor" value in the UI)

For a system to be considered to be SGX enabled, it must meet all the following three conditions:

- `SGX capable`: The CPU in the system must support the Intel SGX extension.

A list of Intel processors with the SGX extension support could be found [here](https://ark.intel.com/Search/FeatureFilter?productType=processors&SoftwareGuardExtensions=true).

Your CPU must be one of the processors in above list or its variants.You can use the following command to find the CPU information on your system:
- On Linux: `cat /proc/cpuinfo`
- On Windows: `msinfo32` (check the "Processor" value in the UI)
You can follow [Intel's instructions](https://www.intel.com/content/www/us/en/support/articles/000028173/processors.html) to look up your specific processor and determine if it supports SGX.

- The system BIOS must support Intel SGX control.

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