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[Xen-changelog] [xen-unstable] x86/intel: Fix CPUID leaf 7 detection
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| Subject: | [Xen-changelog] [xen-unstable] x86/intel: Fix CPUID leaf 7 detection |
| From: | Xen patchbot-unstable <patchbot@xxxxxxx> |
| Date: | Thu, 16 Jun 2011 11:12:06 +0100 |
| Delivery-date: | Thu, 16 Jun 2011 03:21:18 -0700 |
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# 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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