* Re: How to enable Pause Loop Exiting (PLE)? @ 2014-06-09 3:52 Zhang Haoyu 2014-06-09 4:36 ` Jidong Xiao 2014-06-09 5:56 ` Jidong Xiao 0 siblings, 2 replies; 9+ messages in thread From: Zhang Haoyu @ 2014-06-09 3:52 UTC (permalink / raw) To: Jidong Xiao, KVM >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 ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 3:52 How to enable Pause Loop Exiting (PLE)? Zhang Haoyu @ 2014-06-09 4:36 ` Jidong Xiao 2014-06-09 5:56 ` Jidong Xiao 1 sibling, 0 replies; 9+ messages in thread From: Jidong Xiao @ 2014-06-09 4:36 UTC (permalink / raw) To: Zhang Haoyu; +Cc: KVM On Sun, Jun 8, 2014 at 11:52 PM, Zhang Haoyu <zhanghy@sangfor.com> wrote: >>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. Thank you. I think you are right. I have just seen this also: https://lkml.org/lkml/2011/1/4/125 It looks like my cpu is older than Nehalem, so it must be too old and PLE is not supported. -Jidong > >>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 > ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 3:52 How to enable Pause Loop Exiting (PLE)? Zhang Haoyu 2014-06-09 4:36 ` Jidong Xiao @ 2014-06-09 5:56 ` Jidong Xiao 2014-06-09 6:25 ` Zhang Haoyu 1 sibling, 1 reply; 9+ messages in thread From: Jidong Xiao @ 2014-06-09 5:56 UTC (permalink / raw) To: Zhang Haoyu; +Cc: KVM On Sun, Jun 8, 2014 at 11:52 PM, Zhang Haoyu <zhanghy@sangfor.com> wrote: >>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. > Hi, Haoyu, I have another machine, in which Pause Loop Exiting is showing yes, but PAUSE Exiting is also showing yes, see below, but you said PAUSE exiting must be 0 setting, so what shall I do? Is PLE enabled or not? primary processor-based controls Interrupt window exiting yes Use TSC offsetting yes HLT exiting yes INVLPG exiting yes MWAIT exiting yes RDPMC exiting yes RDTSC exiting yes CR3-load exiting default CR3-store exiting default CR8-load exiting yes CR8-store exiting yes Use TPR shadow yes NMI-window exiting yes MOV-DR exiting yes Unconditional I/O exiting yes Use I/O bitmaps yes Monitor trap flag yes Use MSR bitmaps yes MONITOR exiting yes PAUSE exiting yes Activate secondary control yes 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 yes APIC register emulation no Virtual interrupt delivery no PAUSE-loop exiting yes RDRAND exiting no Enable INVPCID no Enable VM functions no VMCS shadowing no EPT-violation #VE no ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 5:56 ` Jidong Xiao @ 2014-06-09 6:25 ` Zhang Haoyu 2014-06-09 7:16 ` Zhang Haoyu 0 siblings, 1 reply; 9+ messages in thread From: Zhang Haoyu @ 2014-06-09 6:25 UTC (permalink / raw) To: Jidong Xiao; +Cc: KVM >>>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. >> >Hi, Haoyu, > >I have another machine, in which Pause Loop Exiting is showing yes, >but PAUSE Exiting is also showing yes, see below, but you said PAUSE >exiting must be 0 setting, so what shall I do? Is PLE enabled or not? > check /sys/module/kvm_intel/parameters/ple_gap, if non-zero(>0), ple is enabled, zero means ple is disabled. Thanks, Zhang Haoyu >primary processor-based controls > Interrupt window exiting yes > Use TSC offsetting yes > HLT exiting yes > INVLPG exiting yes > MWAIT exiting yes > RDPMC exiting yes > RDTSC exiting yes > CR3-load exiting default > CR3-store exiting default > CR8-load exiting yes > CR8-store exiting yes > Use TPR shadow yes > NMI-window exiting yes > MOV-DR exiting yes > Unconditional I/O exiting yes > Use I/O bitmaps yes > Monitor trap flag yes > Use MSR bitmaps yes > MONITOR exiting yes > PAUSE exiting yes > Activate secondary control yes >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 yes > APIC register emulation no > Virtual interrupt delivery no > PAUSE-loop exiting yes > RDRAND exiting no > Enable INVPCID no > Enable VM functions no > VMCS shadowing no > EPT-violation #VE no ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 6:25 ` Zhang Haoyu @ 2014-06-09 7:16 ` Zhang Haoyu 2014-06-09 20:27 ` Jidong Xiao 0 siblings, 1 reply; 9+ messages in thread From: Zhang Haoyu @ 2014-06-09 7:16 UTC (permalink / raw) To: Jidong Xiao; +Cc: KVM >>>>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. >>> >>Hi, Haoyu, >> >>I have another machine, in which Pause Loop Exiting is showing yes, >>but PAUSE Exiting is also showing yes, see below, but you said PAUSE >>exiting must be 0 setting, so what shall I do? Is PLE enabled or not? >> >check /sys/module/kvm_intel/parameters/ple_gap, if non-zero(>0), ple is enabled, zero means ple is disabled. > Sorry, even /sys/module/kvm_intel/parameters/ple_gap is non-zero, it cannot say ple is enabled, it only means 'PAUSE-loop exiting' is 1-setting, but the 'PAUSE-loop exiting' is ignored if 'PAUSE exiting' is 1-settting. But Below words is from the intel 64 and IA-32 Architectures Software Developer’s Manual Volume 3C, • PAUSE.The behavior of each of this instruction depends on CPL and the settings of the “PAUSE exiting” and “PAUSE-loop exiting” VM-execution controls: — CPL= 0. • If the “PAUSE exiting” and “PAUSE-loop exiting” VM-execution controls are both 0, the PAUSE instruction executes normally. • If the “PAUSE exiting” VM-execution control is 1, the PAUSE instruction causes a VM exit (the “PAUSEloop exiting” VM-execution control is ignored if CPL = 0 and the “PAUSE exiting” VM-execution control is 1). • If the “PAUSE exiting” VM-execution control is 0 and the “PAUSE-loop exiting” VM-execution control is 1, the following treatment applies. The processor determines the amount of time between this execution of PAUSE and the previous execution of PAUSE at CPL 0. If this amount of time exceeds the value of the VM-execution control field PLE_Gap, the processor considers this execution to be the first execution of PAUSE in a loop. (It also does so for the first execution of PAUSE at CPL 0 after VM entry.) Otherwise, the processor determines the amount of time since the most recent execution of PAUSE that was considered to be the first in a loop. If this amount of time exceeds the value of the VM-execution control field PLE_Window, a VM exit occurs. For purposes of these computations, time is measured based on a counter that runs at the same rate as the timestamp counter (TSC). — CPL> 0. • If the “PAUSE exiting” VM-execution control is 0, the PAUSE instruction executes normally. • If the “PAUSE exiting” VM-execution control is 1, the PAUSE instruction causes a VM exit. The “PAUSE-loop exiting” VM-execution control is ignored if CPL > 0. >Thanks, >Zhang Haoyu >>primary processor-based controls >> Interrupt window exiting yes >> Use TSC offsetting yes >> HLT exiting yes >> INVLPG exiting yes >> MWAIT exiting yes >> RDPMC exiting yes >> RDTSC exiting yes >> CR3-load exiting default >> CR3-store exiting default >> CR8-load exiting yes >> CR8-store exiting yes >> Use TPR shadow yes >> NMI-window exiting yes >> MOV-DR exiting yes >> Unconditional I/O exiting yes >> Use I/O bitmaps yes >> Monitor trap flag yes >> Use MSR bitmaps yes >> MONITOR exiting yes >> PAUSE exiting yes >> Activate secondary control yes >>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 yes >> APIC register emulation no >> Virtual interrupt delivery no >> PAUSE-loop exiting yes >> RDRAND exiting no >> Enable INVPCID no >> Enable VM functions no >> VMCS shadowing no >> EPT-violation #VE no ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 7:16 ` Zhang Haoyu @ 2014-06-09 20:27 ` Jidong Xiao 2014-06-09 21:04 ` Liwen Wu (liwwu) 2014-06-10 1:58 ` Zhang Haoyu 0 siblings, 2 replies; 9+ messages in thread From: Jidong Xiao @ 2014-06-09 20:27 UTC (permalink / raw) To: Zhang Haoyu; +Cc: KVM On Mon, Jun 9, 2014 at 3:16 AM, Zhang Haoyu <zhanghy@sangfor.com> wrote: >>>>>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. >>>> >>>Hi, Haoyu, >>> >>>I have another machine, in which Pause Loop Exiting is showing yes, >>>but PAUSE Exiting is also showing yes, see below, but you said PAUSE >>>exiting must be 0 setting, so what shall I do? Is PLE enabled or not? >>> >>check /sys/module/kvm_intel/parameters/ple_gap, if non-zero(>0), ple is enabled, zero means ple is disabled. >> > Sorry, even /sys/module/kvm_intel/parameters/ple_gap is non-zero, it cannot say ple is enabled, it only means 'PAUSE-loop exiting' is 1-setting, > but the 'PAUSE-loop exiting' is ignored if 'PAUSE exiting' is 1-settting. > But > Below words is from the intel 64 and IA-32 Architectures Software Developer’s Manual Volume 3C, > • PAUSE.The behavior of each of this instruction depends on CPL and the settings of the “PAUSE exiting” and > “PAUSE-loop exiting” VM-execution controls: > — CPL= 0. > • If the “PAUSE exiting” and “PAUSE-loop exiting” VM-execution controls are both 0, the PAUSE > instruction executes normally. > • If the “PAUSE exiting” VM-execution control is 1, the PAUSE instruction causes a VM exit (the “PAUSEloop > exiting” VM-execution control is ignored if CPL = 0 and the “PAUSE exiting” VM-execution control > is 1). > • If the “PAUSE exiting” VM-execution control is 0 and the “PAUSE-loop exiting” VM-execution control is > 1, the following treatment applies. > The processor determines the amount of time between this execution of PAUSE and the previous > execution of PAUSE at CPL 0. If this amount of time exceeds the value of the VM-execution control field > PLE_Gap, the processor considers this execution to be the first execution of PAUSE in a loop. (It also > does so for the first execution of PAUSE at CPL 0 after VM entry.) > Otherwise, the processor determines the amount of time since the most recent execution of PAUSE that > was considered to be the first in a loop. If this amount of time exceeds the value of the VM-execution > control field PLE_Window, a VM exit occurs. > For purposes of these computations, time is measured based on a counter that runs at the same rate as > the timestamp counter (TSC). > — CPL> 0. > • If the “PAUSE exiting” VM-execution control is 0, the PAUSE instruction executes normally. > • If the “PAUSE exiting” VM-execution control is 1, the PAUSE instruction causes a VM exit. > The “PAUSE-loop exiting” VM-execution control is ignored if CPL > 0. > Thanks. So PLE is still not enabled on my machine? Then how to let "PAUSE Exiting" to be 0-setting? -Jidong >>>primary processor-based controls >>> Interrupt window exiting yes >>> Use TSC offsetting yes >>> HLT exiting yes >>> INVLPG exiting yes >>> MWAIT exiting yes >>> RDPMC exiting yes >>> RDTSC exiting yes >>> CR3-load exiting default >>> CR3-store exiting default >>> CR8-load exiting yes >>> CR8-store exiting yes >>> Use TPR shadow yes >>> NMI-window exiting yes >>> MOV-DR exiting yes >>> Unconditional I/O exiting yes >>> Use I/O bitmaps yes >>> Monitor trap flag yes >>> Use MSR bitmaps yes >>> MONITOR exiting yes >>> PAUSE exiting yes >>> Activate secondary control yes >>>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 yes >>> APIC register emulation no >>> Virtual interrupt delivery no >>> PAUSE-loop exiting yes >>> RDRAND exiting no >>> Enable INVPCID no >>> Enable VM functions no >>> VMCS shadowing no >>> EPT-violation #VE no ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 20:27 ` Jidong Xiao @ 2014-06-09 21:04 ` Liwen Wu (liwwu) 2014-06-10 1:58 ` Zhang Haoyu 1 sibling, 0 replies; 9+ messages in thread From: Liwen Wu (liwwu) @ 2014-06-09 21:04 UTC (permalink / raw) To: Jidong Xiao, Zhang Haoyu; +Cc: KVM On 6/9/14 1:27 PM, "Jidong Xiao" <jidong.xiao@gmail.com> wrote: >On Mon, Jun 9, 2014 at 3:16 AM, Zhang Haoyu <zhanghy@sangfor.com> wrote: >>>>>>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. >>>>> >>>>Hi, Haoyu, >>>> >>>>I have another machine, in which Pause Loop Exiting is showing yes, >>>>but PAUSE Exiting is also showing yes, see below, but you said PAUSE >>>>exiting must be 0 setting, so what shall I do? Is PLE enabled or not? >>>> >>>check /sys/module/kvm_intel/parameters/ple_gap, if non-zero(>0), ple is >>>enabled, zero means ple is disabled. >>> >> Sorry, even /sys/module/kvm_intel/parameters/ple_gap is non-zero, it >>cannot say ple is enabled, it only means 'PAUSE-loop exiting' is >>1-setting, >> but the 'PAUSE-loop exiting' is ignored if 'PAUSE exiting' is >>1-settting. >> But >> Below words is from the intel 64 and IA-32 Architectures Software >>Developer¹s Manual Volume 3C, >> € PAUSE.The behavior of each of this instruction depends on CPL and the >>settings of the ³PAUSE exiting² and >> ³PAUSE-loop exiting² VM-execution controls: >> ‹ CPL= 0. >> € If the ³PAUSE exiting² and ³PAUSE-loop exiting² VM-execution >>controls are both 0, the PAUSE >> instruction executes normally. >> € If the ³PAUSE exiting² VM-execution control is 1, the PAUSE >>instruction causes a VM exit (the ³PAUSEloop >> exiting² VM-execution control is ignored if CPL = 0 and the >>³PAUSE exiting² VM-execution control >> is 1). >> € If the ³PAUSE exiting² VM-execution control is 0 and the >>³PAUSE-loop exiting² VM-execution control is >> 1, the following treatment applies. >> The processor determines the amount of time between this >>execution of PAUSE and the previous >> execution of PAUSE at CPL 0. If this amount of time exceeds the >>value of the VM-execution control field >> PLE_Gap, the processor considers this execution to be the first >>execution of PAUSE in a loop. (It also >> does so for the first execution of PAUSE at CPL 0 after VM entry.) >> Otherwise, the processor determines the amount of time since the >>most recent execution of PAUSE that >> was considered to be the first in a loop. If this amount of time >>exceeds the value of the VM-execution >> control field PLE_Window, a VM exit occurs. >> For purposes of these computations, time is measured based on a >>counter that runs at the same rate as >> the timestamp counter (TSC). >> ‹ CPL> 0. >> € If the ³PAUSE exiting² VM-execution control is 0, the PAUSE >>instruction executes normally. >> € If the ³PAUSE exiting² VM-execution control is 1, the PAUSE >>instruction causes a VM exit. >> The ³PAUSE-loop exiting² VM-execution control is ignored if CPL > 0. >> >Thanks. So PLE is still not enabled on my machine? Then how to let >"PAUSE Exiting" to be 0-setting? > >-Jidong > >>>>primary processor-based controls >>>> Interrupt window exiting yes >>>> Use TSC offsetting yes >>>> HLT exiting yes >>>> INVLPG exiting yes >>>> MWAIT exiting yes >>>> RDPMC exiting yes >>>> RDTSC exiting yes >>>> CR3-load exiting default >>>> CR3-store exiting default >>>> CR8-load exiting yes >>>> CR8-store exiting yes >>>> Use TPR shadow yes >>>> NMI-window exiting yes >>>> MOV-DR exiting yes >>>> Unconditional I/O exiting yes >>>> Use I/O bitmaps yes >>>> Monitor trap flag yes >>>> Use MSR bitmaps yes >>>> MONITOR exiting yes >>>> PAUSE exiting yes >>>> Activate secondary control yes >>>>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 yes >>>> APIC register emulation no >>>> Virtual interrupt delivery no >>>> PAUSE-loop exiting yes >>>> RDRAND exiting no >>>> Enable INVPCID no >>>> Enable VM functions no >>>> VMCS shadowing no >>>> EPT-violation #VE no >-- >To unsubscribe from this list: send the line "unsubscribe kvm" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: How to enable Pause Loop Exiting (PLE)? 2014-06-09 20:27 ` Jidong Xiao 2014-06-09 21:04 ` Liwen Wu (liwwu) @ 2014-06-10 1:58 ` Zhang Haoyu 1 sibling, 0 replies; 9+ messages in thread From: Zhang Haoyu @ 2014-06-10 1:58 UTC (permalink / raw) To: Jidong Xiao, liwwu; +Cc: KVM >>>>>>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. >>>>> >>>>Hi, Haoyu, >>>> >>>>I have another machine, in which Pause Loop Exiting is showing yes, >>>>but PAUSE Exiting is also showing yes, see below, but you said PAUSE >>>>exiting must be 0 setting, so what shall I do? Is PLE enabled or not? >>>> >>>check /sys/module/kvm_intel/parameters/ple_gap, if non-zero(>0), ple is enabled, zero means ple is disabled. >>> >> Sorry, even /sys/module/kvm_intel/parameters/ple_gap is non-zero, it cannot say ple is enabled, it only means 'PAUSE-loop exiting' is 1-setting, >> but the 'PAUSE-loop exiting' is ignored if 'PAUSE exiting' is 1-settting. >> But >> Below words is from the intel 64 and IA-32 Architectures Software Developer’s Manual Volume 3C, >> • PAUSE.The behavior of each of this instruction depends on CPL and the settings of the “PAUSE exiting” and >> “PAUSE-loop exiting” VM-execution controls: >> — CPL= 0. >> • If the “PAUSE exiting” and “PAUSE-loop exiting” VM-execution controls are both 0, the PAUSE >> instruction executes normally. >> • If the “PAUSE exiting” VM-execution control is 1, the PAUSE instruction causes a VM exit (the “PAUSEloop >> exiting” VM-execution control is ignored if CPL = 0 and the “PAUSE exiting” VM-execution control >> is 1). >> • If the “PAUSE exiting” VM-execution control is 0 and the “PAUSE-loop exiting” VM-execution control is >> 1, the following treatment applies. >> The processor determines the amount of time between this execution of PAUSE and the previous >> execution of PAUSE at CPL 0. If this amount of time exceeds the value of the VM-execution control field >> PLE_Gap, the processor considers this execution to be the first execution of PAUSE in a loop. (It also >> does so for the first execution of PAUSE at CPL 0 after VM entry.) >> Otherwise, the processor determines the amount of time since the most recent execution of PAUSE that >> was considered to be the first in a loop. If this amount of time exceeds the value of the VM-execution >> control field PLE_Window, a VM exit occurs. >> For purposes of these computations, time is measured based on a counter that runs at the same rate as >> the timestamp counter (TSC). >> — CPL> 0. >> • If the “PAUSE exiting” VM-execution control is 0, the PAUSE instruction executes normally. >> • If the “PAUSE exiting” VM-execution control is 1, the PAUSE instruction causes a VM exit. >> The “PAUSE-loop exiting” VM-execution control is ignored if CPL > 0. >> >Thanks. So PLE is still not enabled on my machine? Then how to let >"PAUSE Exiting" to be 0-setting? > Sorry, I don't know, but you can make a confirmation first. "PAUSE Exiting" is 0-setting in setup_vmcs_config() function, but it maybe 1-setting in adjust_vmx_controls(), so you can printk the bitwise-and result of (_cpu_based_exec_control & CPU_BASED_PAUSE_EXITING) after adjust_vmx_controls in setup_vmcs_config. Any better ideas? Thanks, Zhang Haoyu >-Jidong > >>>>primary processor-based controls >>>> Interrupt window exiting yes >>>> Use TSC offsetting yes >>>> HLT exiting yes >>>> INVLPG exiting yes >>>> MWAIT exiting yes >>>> RDPMC exiting yes >>>> RDTSC exiting yes >>>> CR3-load exiting default >>>> CR3-store exiting default >>>> CR8-load exiting yes >>>> CR8-store exiting yes >>>> Use TPR shadow yes >>>> NMI-window exiting yes >>>> MOV-DR exiting yes >>>> Unconditional I/O exiting yes >>>> Use I/O bitmaps yes >>>> Monitor trap flag yes >>>> Use MSR bitmaps yes >>>> MONITOR exiting yes >>>> PAUSE exiting yes >>>> Activate secondary control yes >>>>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 yes >>>> APIC register emulation no >>>> Virtual interrupt delivery no >>>> PAUSE-loop exiting yes >>>> RDRAND exiting no >>>> Enable INVPCID no >>>> Enable VM functions no >>>> VMCS shadowing no >>>> EPT-violation #VE no ^ permalink raw reply [flat|nested] 9+ messages in thread
* How to enable Pause Loop Exiting (PLE)? @ 2014-06-08 18:34 Jidong Xiao 0 siblings, 0 replies; 9+ messages in thread From: Jidong Xiao @ 2014-06-08 18:34 UTC (permalink / raw) To: KVM 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: 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 ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2014-06-10 1:59 UTC | newest] Thread overview: 9+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2014-06-09 3:52 How to enable Pause Loop Exiting (PLE)? Zhang Haoyu 2014-06-09 4:36 ` Jidong Xiao 2014-06-09 5:56 ` Jidong Xiao 2014-06-09 6:25 ` Zhang Haoyu 2014-06-09 7:16 ` Zhang Haoyu 2014-06-09 20:27 ` Jidong Xiao 2014-06-09 21:04 ` Liwen Wu (liwwu) 2014-06-10 1:58 ` Zhang Haoyu -- strict thread matches above, loose matches on Subject: below -- 2014-06-08 18:34 Jidong Xiao
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