[Xen-devel] [PATCH] vpmu intel: pass through cpuid bits when BTS is enabled

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Hi,

this patch passes the orginal cpuid bits for X86_FEATURE_DTES64
(64-bit DS Area) and X86_FEATURE_DSCPL (CPL Qualified Debug Store) to the
guest when the BTS feature is switched on.
I forgot this when I did this BTS emulation.
Thanks.

Dietmar.


Signed-off-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>


diff -r a6b81234b189 xen/arch/x86/hvm/vmx/vpmu_core2.c
--- a/xen/arch/x86/hvm/vmx/vpmu_core2.c Mon Mar 11 16:13:42 2013 +0000
+++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c Tue Mar 12 13:58:40 2013 +0100
@@ -607,6 +607,10 @@ static void core2_vpmu_do_cpuid(unsigned
         {
             /* Switch on the 'Debug Store' feature in CPUID.EAX[1]:EDX[21] */
             *edx |= cpufeat_mask(X86_FEATURE_DS);
+            if ( cpu_has(&current_cpu_data, X86_FEATURE_DTES64) )
+                *ecx |= cpufeat_mask(X86_FEATURE_DTES64);
+            if ( cpu_has(&current_cpu_data, X86_FEATURE_DSCPL) )
+                *ecx |= cpufeat_mask(X86_FEATURE_DSCPL);
         }
     }
 }


-- 
Company details: http://ts.fujitsu.com/imprint.html

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