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Documentation/x86: Introduce enclave runtime management section 

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>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lkml.kernel.org/r/1da0b9a938b28e68e6870ebd5291490d680e700b.1652137848.git.reinette.chatre@intel.com
This commit is contained in:
Reinette Chatre 2022-05-10 11:08:57 -07:00 committed by Dave Hansen
parent a0506b3b06
commit 629b5155d0
1 changed files with 15 additions and 0 deletions
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Documentation/x86/sgx.rst
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@ -100,6 +100,21 @@ pages and establish enclave page permissions.
sgx_ioc_enclave_init sgx_ioc_enclave_init
sgx_ioc_enclave_provision 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_types
sgx_ioc_enclave_remove_pages
Enclave vDSO Enclave vDSO
------------ ------------