diff options
| author | Yang, Wei <wei.y.yang@intel.com> | 2011-06-14 12:44:48 +0100 |
|---|---|---|
| committer | Yang, Wei <wei.y.yang@intel.com> | 2011-06-14 12:44:48 +0100 |
| commit | 30090ad8567c97578099fb2aaec29a6a7c9f90a6 (patch) | |
| tree | 560b46395c1991719674d77519df7141bc7ef3cb /tools | |
| parent | 70c3da08fb4a7d158ebed65fb57ed741668b6a20 (diff) | |
| download | xen-30090ad8567c97578099fb2aaec29a6a7c9f90a6.tar.gz xen-30090ad8567c97578099fb2aaec29a6a7c9f90a6.tar.bz2 xen-30090ad8567c97578099fb2aaec29a6a7c9f90a6.zip | |
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/libxc/xc_cpufeature.h | 1 | ||||
| -rw-r--r-- | tools/libxc/xc_cpuid_x86.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/tools/libxc/xc_cpufeature.h b/tools/libxc/xc_cpufeature.h index a110e6ef01..b1941f9956 100644 --- 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 */ diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c index aae6882653..287b1e7789 100644 --- a/tools/libxc/xc_cpuid_x86.c +++ b/tools/libxc/xc_cpuid_x86.c @@ -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)); |