x86/sgx: Add short descriptions to ENCLS wrappers

mainline inclusion
from mainline-6.0-rc1
commit 4c3f7358
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5USAM


CVE: NA

Intel-SIG: commit 4c3f7358 x86/sgx: Add short descriptions to ENCLS
wrappers.
Backport for SGX EDMM support.

--------------------------------

The SGX ENCLS instruction uses EAX to specify an SGX function and
may require additional registers, depending on the SGX function.
ENCLS invokes the specified privileged SGX function for managing
and debugging enclaves. Macros are used to wrap the ENCLS
functionality and several wrappers are used to wrap the macros to
make the different SGX functions accessible in the code.

The wrappers of the supported SGX functions are cryptic. Add short
descriptions of each as a comment.

Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
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/5e78a1126711cbd692d5b8132e0683873398f69e.1652137848.git.reinette.chatre@intel.com


Signed-off-by: Zhiquan Li <zhiquan1.li@intel.com>