[Xen-users] Dom0 mask CPU flags?

["bupt.cc" <bupt.cc@xxxxxx>]

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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