As SDM stated, CPUID 0x12 leaves depend on CPUID_7_0_EBX_SGX (SGX
feature word).

Since FEAT_SGX_12_0_EAX, FEAT_SGX_12_0_EBX and FEAT_SGX_12_1_EAX define
multiple feature words, add the dependencies of those registers to
report the warning to user if SGX is absent.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 target/i386/cpu.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 7a6d0b05ce27..7f55e9ba3ed8 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1734,6 +1734,18 @@ static FeatureDep feature_dependencies[] = {
         .from = { FEAT_7_0_EBX,             CPUID_7_0_EBX_SGX },
         .to = { FEAT_7_0_ECX,               CPUID_7_0_ECX_SGX_LC },
     },
+    {
+        .from = { FEAT_7_0_EBX,             CPUID_7_0_EBX_SGX },
+        .to = { FEAT_SGX_12_0_EAX,          ~0ull },
+    },
+    {
+        .from = { FEAT_7_0_EBX,             CPUID_7_0_EBX_SGX },
+        .to = { FEAT_SGX_12_0_EBX,          ~0ull },
+    },
+    {
+        .from = { FEAT_7_0_EBX,             CPUID_7_0_EBX_SGX },
+        .to = { FEAT_SGX_12_1_EAX,          ~0ull },
+    },
 };
 
 typedef struct X86RegisterInfo32 {
-- 
2.34.1