[RFC PATCH 15/20] hw/i386/pc: Set SGX bits in feature control fw_cfg accordingly

[Sean Christopherson <sean.j.christopherson@xxxxxxxxx>]

Request SGX an SGX Launch Control to be enabled in FEATURE_CONTROL when
the features are exposed to the guest.

Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
 hw/i386/pc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 549c437050..8c8b404799 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1670,7 +1670,7 @@ static void pc_build_feature_control_file(PCMachineState *pcms)
     MachineState *ms = MACHINE(pcms);
     X86CPU *cpu = X86_CPU(ms->possible_cpus->cpus[0].cpu);
     CPUX86State *env = &cpu->env;
-    uint32_t unused, ecx, edx;
+    uint32_t unused, ebx, ecx, edx;
     uint64_t feature_control_bits = 0;
     uint64_t *val;
 
@@ -1685,6 +1685,14 @@ static void pc_build_feature_control_file(PCMachineState *pcms)
         feature_control_bits |= FEATURE_CONTROL_LMCE;
     }
 
+    cpu_x86_cpuid(env, 0x7, 0, &unused, &ebx, &ecx, &unused);
+    if (ebx & CPUID_7_0_EBX_SGX) {
+        feature_control_bits |= FEATURE_CONTROL_SGX;
+    }
+    if (ecx & CPUID_7_0_ECX_SGX_LC) {
+        feature_control_bits |= FEATURE_CONTROL_SGX_LC;
+    }
+
     if (!feature_control_bits) {
         return;
     }
-- 
2.22.0