From ba1fb13629c621ca0013752502927b767abd632c Mon Sep 17 00:00:00 2001
From: Kai Huang <kai.huang@intel.com>
Date: Wed, 9 Nov 2022 15:48:34 +1300
Subject: [PATCH 1104/1119] target/i386: Add SGX aex-notify and EDECCSSA
 support

commit d45f24fe7525d8a8aaa4ca6d9d214dc41819caa5 upstream.

The new SGX Asynchronous Exit (AEX) notification mechanism (AEX-notify)
allows one enclave to receive a notification in the ERESUME after the
enclave exit due to an AEX.  EDECCSSA is a new SGX user leaf function
(ENCLU[EDECCSSA]) to facilitate the AEX notification handling.

Whether the hardware supports to create enclave with AEX-notify support
is enumerated via CPUID.(EAX=0x12,ECX=0x1):EAX[10].  The new EDECCSSA
user leaf function is enumerated via CPUID.(EAX=0x12,ECX=0x0):EAX[11].

Add support to allow to expose the new SGX AEX-notify feature and the
new EDECCSSA user leaf function to KVM guest.

Intel-SIG: commit d45f24fe7525 ("target/i386: Add SGX aex-notify and EDECCSSA support").
Backport SGX aex_notify and EDECCSSA support

Link: https://lore.kernel.org/lkml/166760360549.4906.809756297092548496.tip-bot2@tip-bot2/
Link: https://lore.kernel.org/lkml/166760360934.4906.2427175408052308969.tip-bot2@tip-bot2/
Reviewed-by: Yang Zhong <yang.zhong@linux.intel.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20221109024834.172705-1-kai.huang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[ jason: amend commit log ]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 target/i386/cpu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 67b359328569..21300c2d1916 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1246,7 +1246,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .feat_names = {
             "sgx1", "sgx2", NULL, NULL,
             NULL, NULL, NULL, NULL,
-            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, "sgx-edeccssa",
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
@@ -1286,7 +1286,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .feat_names = {
             NULL, "sgx-debug", "sgx-mode64", NULL,
             "sgx-provisionkey", "sgx-tokenkey", NULL, "sgx-kss",
-            NULL, NULL, NULL, NULL,
+            NULL, NULL, "sgx-aex-notify", NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
-- 
2.33.0