KVM: Enable DRNG feature support for KVM

This patch exposes DRNG feature to KVM guests.

The RDRAND instruction can provide software with sequences of
random numbers generated from white noise.

Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 84f46074ca7485485a33cd8062bd29d57d7abf6d..6f1e54d0828dbeee37cc56af42e9f531a2f2ae0a 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2345,7 +2345,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
                0 /* Reserved, DCA */ | F(XMM4_1) |
                F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
                0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
-               F(F16C);
+               F(F16C) | F(RDRAND);
        /* cpuid 0x80000001.ecx */
        const u32 kvm_supported_word6_x86_features =
                F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |