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From d6d1ac0735a6e105e37ca3d010d59ce070566ea6 Mon Sep 17 00:00:00 2001
From: Reinette Chatre <reinette.chatre@intel.com>
Date: Fri, 7 Jan 2022 11:28:42 -0800
Subject: [PATCH 04/30] x86/sgx: Add wrapper for SGX2 EAUG function
Add a wrapper for the EAUG ENCLS leaf function used to
add a page to an initialized enclave.
EAUG:
1) Stores all properties of the new enclave page in the SGX
hardware's Enclave Page Cache Map (EPCM).
2) Sets the PENDING bit in the EPCM entry of the enclave page.
This bit is cleared by the enclave by invoking ENCLU leaf
function EACCEPT or EACCEPTCOPY.
Access from within the enclave to the new enclave page is not
possible until the PENDING bit is cleared.
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
---
arch/x86/kernel/cpu/sgx/encls.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kernel/cpu/sgx/encls.h b/arch/x86/kernel/cpu/sgx/encls.h
index 7a1ecf704ec1..99004b02e2ed 100644
--- a/arch/x86/kernel/cpu/sgx/encls.h
+++ b/arch/x86/kernel/cpu/sgx/encls.h
@@ -227,4 +227,10 @@ static inline int __emodt(struct sgx_secinfo *secinfo, void *addr)
return __encls_ret_2(EMODT, secinfo, addr);
}
+/* Zero a page of EPC memory and add it to an initialized enclave. */
+static inline int __eaug(struct sgx_pageinfo *pginfo, void *addr)
+{
+ return __encls_2(EAUG, pginfo, addr);
+}
+
#endif /* _X86_ENCLS_H */
--
2.35.1
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