Re: [PATCH V4 21/31] Documentation/x86: Introduce enclave runtime management section

[Reinette Chatre <reinette.chatre@intel.com>]

Hi Jarkko,

On 4/14/2022 4:21 AM, Jarkko Sakkinen wrote:
> On Wed, 2022-04-13 at 14:10 -0700, Reinette Chatre wrote:
>> Enclave runtime management is introduced following the pattern
>> of the section describing enclave building. Provide a brief
>> summary of enclave runtime management, pointing to the functions
>> implementing the ioctl()s that will contain details within their
>> kernel-doc.
>>
>> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
>> ---
>> No changes since V3.
>>
>> Changes since V2:
>> - Remove references to ioctl() to relax permissions and update to reflect
>>   function renaming sgx_ioc_enclave_restrict_perm() ->
>>   sgx_ioc_enclave_restrict_permissions().
>> - Rename sgx_ioc_enclave_modt -> sgx_ioc_enclave_modify_type
>>
>> Changes since V1:
>> - New patch.
>>
>>  Documentation/x86/sgx.rst | 15 +++++++++++++++
>>  1 file changed, 15 insertions(+)
>>
>> diff --git a/Documentation/x86/sgx.rst b/Documentation/x86/sgx.rst
>> index 265568a9292c..10287c558485 100644
>> --- a/Documentation/x86/sgx.rst
>> +++ b/Documentation/x86/sgx.rst
>> @@ -100,6 +100,21 @@ pages and establish enclave page permissions.
>>                 sgx_ioc_enclave_init
>>                 sgx_ioc_enclave_provision
>>  
>> +Enclave runtime management
>> +--------------------------
>> +
>> +Systems supporting SGX2 additionally support changes to initialized
>> +enclaves: modifying enclave page permissions and type, and dynamically
>> +adding and removing of enclave pages. When an enclave accesses an address
>> +within its address range that does not have a backing page then a new
>> +regular page will be dynamically added to the enclave. The enclave is
>> +still required to run EACCEPT on the new page before it can be used.
>> +
>> +.. kernel-doc:: arch/x86/kernel/cpu/sgx/ioctl.c
>> +   :functions: sgx_ioc_enclave_restrict_permissions
>> +               sgx_ioc_enclave_modify_type
>> +               sgx_ioc_enclave_remove_pages
>> +
>>  Enclave vDSO
>>  ------------
>>  
> 
> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
> 

Thank you.

Reinette