1 files changed, 108 insertions, 0 deletions
diff --git a/0001-x86-sgx-Add-short-descriptions-to-ENCLS-wrappers.patch b/0001-x86-sgx-Add-short-descriptions-to-ENCLS-wrappers.patch
new file mode 100644
index 000000000000..fc5947429922
--- /dev/null
+++ b/0001-x86-sgx-Add-short-descriptions-to-ENCLS-wrappers.patch
@@ -0,0 +1,108 @@
+From fd368818463168ceaa7904dcb0ac4072537c8fcc Mon Sep 17 00:00:00 2001
+From: Reinette Chatre <reinette.chatre@intel.com>
+Date: Mon, 7 Feb 2022 16:45:23 -0800
+Subject: [PATCH 01/34] x86/sgx: Add short descriptions to ENCLS wrappers
+
+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>
+---
+ arch/x86/kernel/cpu/sgx/encls.h | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+diff --git a/arch/x86/kernel/cpu/sgx/encls.h b/arch/x86/kernel/cpu/sgx/encls.h
+index fa04a73daf9c..0e22fa8f77c5 100644
+--- a/arch/x86/kernel/cpu/sgx/encls.h
++++ b/arch/x86/kernel/cpu/sgx/encls.h
+@@ -136,57 +136,71 @@ static inline bool encls_failed(int ret)
+ 	ret;						\
+ 	})
+ 
++/* Initialize an EPC page into an SGX Enclave Control Structure (SECS) page. */
+ static inline int __ecreate(struct sgx_pageinfo *pginfo, void *secs)
+ {
+ 	return __encls_2(ECREATE, pginfo, secs);
+ }
+ 
++/* Hash a 256 byte region of an enclave page to SECS:MRENCLAVE. */
+ static inline int __eextend(void *secs, void *addr)
+ {
+ 	return __encls_2(EEXTEND, secs, addr);
+ }
+ 
++/*
++ * Associate an EPC page to an enclave either as a REG or TCS page
++ * populated with the provided data.
++ */
+ static inline int __eadd(struct sgx_pageinfo *pginfo, void *addr)
+ {
+ 	return __encls_2(EADD, pginfo, addr);
+ }
+ 
++/* Finalize enclave build, initialize enclave for user code execution. */
+ static inline int __einit(void *sigstruct, void *token, void *secs)
+ {
+ 	return __encls_ret_3(EINIT, sigstruct, secs, token);
+ }
+ 
++/* Disassociate EPC page from its enclave and mark it as unused. */
+ static inline int __eremove(void *addr)
+ {
+ 	return __encls_ret_1(EREMOVE, addr);
+ }
+ 
++/* Copy data to an EPC page belonging to a debug enclave. */
+ static inline int __edbgwr(void *addr, unsigned long *data)
+ {
+ 	return __encls_2(EDGBWR, *data, addr);
+ }
+ 
++/* Copy data from an EPC page belonging to a debug enclave. */
+ static inline int __edbgrd(void *addr, unsigned long *data)
+ {
+ 	return __encls_1_1(EDGBRD, *data, addr);
+ }
+ 
++/* Track that software has completed the required TLB address clears. */
+ static inline int __etrack(void *addr)
+ {
+ 	return __encls_ret_1(ETRACK, addr);
+ }
+ 
++/* Load, verify, and unblock an EPC page. */
+ static inline int __eldu(struct sgx_pageinfo *pginfo, void *addr,
+ 			 void *va)
+ {
+ 	return __encls_ret_3(ELDU, pginfo, addr, va);
+ }
+ 
++/* Make EPC page inaccessible to enclave, ready to be written to memory. */
+ static inline int __eblock(void *addr)
+ {
+ 	return __encls_ret_1(EBLOCK, addr);
+ }
+ 
++/* Initialize an EPC page into a Version Array (VA) page. */
+ static inline int __epa(void *addr)
+ {
+ 	unsigned long rbx = SGX_PAGE_TYPE_VA;
+@@ -194,6 +208,7 @@ static inline int __epa(void *addr)
+ 	return __encls_2(EPA, rbx, addr);
+ }
+ 
++/* Invalidate an EPC page and write it out to main memory. */
+ static inline int __ewb(struct sgx_pageinfo *pginfo, void *addr,
+ 			void *va)
+ {
+-- 
+2.35.1
+