[Xen-devel] [patch] provide uniqe x2apicid for each vcpu in the cpuid leaf 0xb

[Nitin A Kamble <nitin.a.kamble@xxxxxxxxx>]

Keir,

Just like the apicid, x2apicid is also unique to each cpu. x2apicid is
coming from edx register of the cpuid leaf 0xb. 

Please Apply/comment.

Signed-Off-By: Nitin A Kamble <nitin.a.kamble@xxxxxxxxx>


diff -r 08618cd10522 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Mon May 04 14:13:49 2009 -0700
+++ b/xen/arch/x86/hvm/hvm.c    Mon May 04 14:19:05 2009 -0700
@@ -1687,6 +1687,10 @@
         *ebx |= (v->vcpu_id * 2) << 24;
         if ( vlapic_hw_disabled(vcpu_vlapic(v)) )
             __clear_bit(X86_FEATURE_APIC & 31, edx);
+    } else if ( input == 0x0000000b )
+    {
+        /* fix the x2apicid */
+       *edx = v->vcpu_id * 2;
     }
 }



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