# HG changeset patch
# User Yang, Wei <wei.y.yang@intel.com>
# Date 1308051888 -3600
# Node ID 864a3dd1d9b4664f1ece44c9eaf390969253b7a8
# Parent  782bc7b2661a3921af21130f34f599f68911f2ce
x86/hvm: Make DRNG feature visible in CPUID

This patch exposes DRNG feature to HVM 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>

--- a/tools/libxc/xc_cpufeature.h
+++ b/tools/libxc/xc_cpufeature.h
@@ -87,6 +87,7 @@
 #define X86_FEATURE_XSAVE       26 /* XSAVE/XRSTOR/XSETBV/XGETBV */
 #define X86_FEATURE_AVX         28 /* Advanced Vector Extensions */
 #define X86_FEATURE_F16C        29 /* Half-precision convert instruction */
+#define X86_FEATURE_RDRAND      30 /* Digital Random Number Generator */
 #define X86_FEATURE_HYPERVISOR  31 /* Running under some hypervisor */
 
 /* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001 */
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -262,6 +262,7 @@ static void xc_cpuid_hvm_policy(
                     bitmaskof(X86_FEATURE_POPCNT) |
                     bitmaskof(X86_FEATURE_AES) |
                     bitmaskof(X86_FEATURE_F16C) |
+                    bitmaskof(X86_FEATURE_RDRAND) |
                     ((xfeature_mask != 0) ?
                      (bitmaskof(X86_FEATURE_AVX) |
                       bitmaskof(X86_FEATURE_XSAVE)) : 0));
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -105,6 +105,7 @@
 #define X86_FEATURE_OSXSAVE	(4*32+27) /* OSXSAVE */
 #define X86_FEATURE_AVX 	(4*32+28) /* Advanced Vector Extensions */
 #define X86_FEATURE_F16C 	(4*32+29) /* Half-precision convert instruction */
+#define X86_FEATURE_RDRAND 	(4*32+30) /* Digital Random Number Generator */
 #define X86_FEATURE_HYPERVISOR	(4*32+31) /* Running under some hypervisor */
 
 /* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */