On Mon, Jun 9, 2014 at 3:16 AM, Zhang Haoyu <zhanghy@xxxxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
