Re: [Xen-devel] [Question] About the behavior of HLT in VMX guest mode

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.03.17 at 06:12, <longpeng2@xxxxxxxxxx> wrote:
> I'm confusing about the behavior of HLT instruction in VMX guest mode.
> 
> I set "hlt exiting" bit to 0 in VMCS, and the vcpu didn't vmexit when execute
> HLT as expected. However, I used powertop/cpupower on host to watch the pcpu's
> c-states, it seems that the pcpu didn't enter C1/C1E state during this 
> period.

I guess no-one expects a VMM to want to set this control to zero,
so the behavior may well be unspecified or model-specific. Neither
of which I'm in the position to comment on, so I can only defer to
the Intel guys.

Jan


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