[Xen-devel] [PATCH] Enable DRNG feature support for HVM guests

["Yang, Wei Y" <wei.y.yang@xxxxxxxxx>]

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@xxxxxxxxx>

---
 tools/libxc/xc_cpufeature.h      |    1 +
 tools/libxc/xc_cpuid_x86.c       |    1 +
 xen/include/asm-x86/cpufeature.h |    1 +
 3 files changed, 3 insertions(+)

diff -r 782bc7b2661a tools/libxc/xc_cpufeature.h
--- a/tools/libxc/xc_cpufeature.h       Fri Jun 10 13:51:39 2011 +0100
+++ b/tools/libxc/xc_cpufeature.h       Mon Jun 13 16:04:44 2011 +0800
@@ -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 */
diff -r 782bc7b2661a tools/libxc/xc_cpuid_x86.c
--- a/tools/libxc/xc_cpuid_x86.c        Fri Jun 10 13:51:39 2011 +0100
+++ b/tools/libxc/xc_cpuid_x86.c        Mon Jun 13 16:04:44 2011 +0800
@@ -314,6 +314,7 @@ 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));
diff -r 782bc7b2661a xen/include/asm-x86/cpufeature.h
--- a/xen/include/asm-x86/cpufeature.h  Fri Jun 10 13:51:39 2011 +0100
+++ b/xen/include/asm-x86/cpufeature.h  Mon Jun 13 16:04:44 2011 +0800
@@ -106,6 +106,7 @@
 #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 */ 


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