This patch fixes CPUID leaf 7 syntax in Xen, which needs to set sub leaf to 0
(input ECX=0).
Signed-off-by: Yang, Wei <wei.y.yang@intel.com>
Signed-off-by: Li, Xin <xin.li@intel.com>
common.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -r 88fe9f780b3d -r 3ffa6082b9a0 xen/arch/x86/cpu/common.c
--- a/xen/arch/x86/cpu/common.c Thu May 26 17:16:47 2011 +0100
+++ b/xen/arch/x86/cpu/common.c Sat May 28 06:02:37 2011 +0800
@@ -263,8 +263,11 @@
/* Intel-defined flags: level 0x00000007 */
if ( c->cpuid_level >= 0x00000007 )
- c->x86_capability[X86_FEATURE_FSGSBASE / 32]
- = cpuid_ebx(0x00000007);
+ {
+ u32 dummy;
+ cpuid_count(0x00000007, 0, &dummy, &ebx, &dummy,
&dummy);
+ c->x86_capability[X86_FEATURE_FSGSBASE / 32] = ebx;
+ }
early_intel_workaround(c);
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