diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index a50f059..4a8608e 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -362,6 +362,7 @@
 #define CPUID_EXT_POPCNT   (1 << 23)
 #define CPUID_EXT_XSAVE    (1 << 26)
 #define CPUID_EXT_OSXSAVE  (1 << 27)
+#define CPUID_EXT_HYPERVISOR  (1 << 31)
 
 #define CPUID_EXT2_SYSCALL (1 << 11)
 #define CPUID_EXT2_MP      (1 << 19)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 70a9b45..4a3f598 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -143,8 +143,12 @@
 
     kvm_trim_features(&env->cpuid_features,
         kvm_arch_get_supported_cpuid(env, 1, R_EDX));
+
+    i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR;
     kvm_trim_features(&env->cpuid_ext_features,
         kvm_arch_get_supported_cpuid(env, 1, R_ECX));
+    env->cpuid_ext_features |= i;
+
     kvm_trim_features(&env->cpuid_ext2_features,
         kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX));
     kvm_trim_features(&env->cpuid_ext3_features,