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[Xen-users] Dom0 mask CPU flags?

To: "xen-users" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Dom0 mask CPU flags?
From: "bupt.cc" <bupt.cc@xxxxxx>
Date: Thu, 12 Aug 2010 15:00:29 +0800
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Hi all,
 
Does Xen dom0 mask CPU flags or what?
 
I execute "cat /proc/cpuinfo" on bare-metal linux ,and get:
 
+-------------------------------------------------------------------------------------------------
|
| flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36
|          clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm
|          3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
|
+-------------------------------------------------------------------------------------------------
 
But when I boot into Xen dom0 linux, I get:
 
+-------------------------------------------------------------------------------------------------
|
|flags : fpu de tsc msr pae mce cx8 apic mtrr mca cmov pat clflush mmx fxsr sse sse2 
|            ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good pni cx16 
|            hypervisor lahf_lm cmp_legacy extapic cr8_legacy
|
+-------------------------------------------------------------------------------------------------
 
Couple of flags are missing. 
 
How does that happen?
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