Re: How to enable Pause Loop Exiting (PLE)?

["Zhang Haoyu" <zhanghy@sangfor.com>]

>Hi,
>
>I am using this tool for querying VMX capabilities.
>
>http://git.qemu.org/?p=qemu.git;a=blob_plain;f=scripts/kvm/vmxcap;hb=HEAD
>
>And it shows as below that pause-loop exiting is not enabled. My kernel is 3.14.
>
>secondary processor-based controls
>  Virtualize APIC accesses                 yes
>  Enable EPT                               yes
>  Descriptor-table exiting                 yes
>  Enable RDTSCP                            yes
>  Virtualize x2APIC mode                   yes
>  Enable VPID                              yes
>  WBINVD exiting                           yes
>  Unrestricted guest                       no
>  APIC register emulation                  no
>  Virtual interrupt delivery               no
>  PAUSE-loop exiting                       no
>  RDRAND exiting                           no
>  Enable INVPCID                           no
>  Enable VM functions                      no
>  VMCS shadowing                           no
>  EPT-violation #VE                        no
>
>What shall I do if I wish to enable PLE? I have also tried this:
>
>From above info, your physical cpu dose not support ple feature,
if you want to enable ple, your cpu must support ple feature, and 'PAUSE exiting' must be 0-settting, 'PAUSE-loop exiting' must be 1-setting.
And, kvm-intel module will enable ple as default if your cpu support ple feature.

>linux-vsvo:~/code/test # rmmod kvm-intel
>linux-vsvo:~/code/test # modprobe kvm-intel ple_gap=128
>linux-vsvo:~/code/test # cat /sys//module/kvm_intel/parameters/ple_gap
>0
>
>But, it does not change the ple_gap, and also, the above script still
>says PLE is disabled.
>
>-Jidong