[Xen-changelog] [xen-unstable] x86/intel: Fix CPUID leaf 7 detection

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Yang, Wei <wei.y.yang@xxxxxxxxx>
# Date 1306569432 -3600
# Node ID f6ce871e568949f5817470f6c7bab6ed1f8f6c13
# Parent  c15f06b99bbe0498c6fbad8155aec54c593f8ceb
x86/intel: Fix CPUID leaf 7 detection

Must set subleaf to 0 (input ECX==0).

Signed-off-by: Yang, Wei <wei.y.yang@xxxxxxxxx>
Signed-off-by: Li, Xin <xin.li@xxxxxxxxx>
---


diff -r c15f06b99bbe -r f6ce871e5689 xen/arch/x86/cpu/common.c
--- a/xen/arch/x86/cpu/common.c Sat May 28 08:33:54 2011 +0100
+++ b/xen/arch/x86/cpu/common.c Sat May 28 08:57:12 2011 +0100
@@ -262,9 +262,11 @@
        }
 
        /* Intel-defined flags: level 0x00000007 */
-       if ( c->cpuid_level >= 0x00000007 )
-               c->x86_capability[X86_FEATURE_FSGSBASE / 32]
-                       = cpuid_ebx(0x00000007);
+       if ( c->cpuid_level >= 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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