[PATCH v4 07/33] i386: Add SGX CPUID leaf FEAT_SGX_12_0_EAX

[Yang Zhong <yang.zhong@intel.com>]

From: Sean Christopherson <sean.j.christopherson@intel.com>

CPUID leaf 12_0_EAX is an Intel-defined feature bits leaf enumerating
the CPU's SGX capabilities, e.g. supported SGX instruction sets.
Currently there are four enumerated capabilities:

    - SGX1 instruction set, i.e. "base" SGX
    - SGX2 instruction set for dynamic EPC management
    - ENCLV instruction set for VMM oversubscription of EPC
    - ENCLS-C instruction set for thread safe variants of ENCLS

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
---
 target/i386/cpu.c | 20 ++++++++++++++++++++
 target/i386/cpu.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 7796d1caa6..13289e0547 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -653,6 +653,7 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1,
           /* missing:
           CPUID_XSAVE_XSAVEC, CPUID_XSAVE_XSAVES */
 #define TCG_14_0_ECX_FEATURES 0
+#define TCG_SGX_12_0_EAX_FEATURES 0
 
 FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
     [FEAT_1_EDX] = {
@@ -1181,6 +1182,25 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .tcg_features = TCG_14_0_ECX_FEATURES,
      },
 
+    [FEAT_SGX_12_0_EAX] = {
+        .type = CPUID_FEATURE_WORD,
+        .feat_names = {
+            "sgx1", "sgx2", NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+        },
+        .cpuid = {
+            .eax = 0x12,
+            .needs_ecx = true, .ecx = 0,
+            .reg = R_EAX,
+        },
+        .tcg_features = TCG_SGX_12_0_EAX_FEATURES,
+    },
 };
 
 typedef struct FeatureMask {
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index af33f956fe..21830b2d79 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -561,6 +561,7 @@ typedef enum FeatureWord {
     FEAT_VMX_BASIC,
     FEAT_VMX_VMFUNC,
     FEAT_14_0_ECX,
+    FEAT_SGX_12_0_EAX,  /* CPUID[EAX=0x12,ECX=0].EAX (SGX) */
     FEATURE_WORDS,
 } FeatureWord;