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From: "Jan Beulich" <JBeulich@suse.com>
To: "Longpeng (Mike)" <longpeng2@huawei.com>
Cc: kevin.tian@intel.com, xen-devel@lists.xenproject.org,
	xuquan8@huawei.com, Gonglei <arei.gonglei@huawei.com>,
	"Herongguang (Stephen)" <herongguang.he@huawei.com>
Subject: Re: [Question] About the behavior of HLT in VMX guest mode
Date: Mon, 13 Mar 2017 05:38:26 -0600	[thread overview]
Message-ID: <58C692C20200007800142737@prv-mh.provo.novell.com> (raw)
In-Reply-To: <58C62A48.6030203@huawei.com>

>>> On 13.03.17 at 06:12, <longpeng2@huawei.com> 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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  reply	other threads:[~2017-03-13 11:38 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-13  5:12 [Question] About the behavior of HLT in VMX guest mode Longpeng (Mike)
2017-03-13 11:38 ` Jan Beulich [this message]
2017-03-14  1:11   ` Longpeng (Mike)
2017-03-13  6:12 Longpeng (Mike)
2017-03-13  7:12 Longpeng (Mike)
2017-03-15 17:32 ` Radim Krčmář
2017-03-16  2:08   ` Longpeng (Mike)
2017-03-16  2:48     ` Longpeng (Mike)
2017-03-16  8:51     ` Wanpeng Li
2017-03-16  9:19       ` Longpeng (Mike)
2017-03-16 14:23     ` Radim Krčmář
2017-03-17  5:22       ` Longpeng (Mike)
2017-03-20 15:18         ` Radim Krčmář
2017-03-21  1:47           ` Longpeng (Mike)
2017-03-21  6:21             ` Wanpeng Li
2017-03-21 16:45               ` Radim Krčmář
2017-07-04  4:24                 ` Wanpeng Li
2017-07-10 17:08                   ` Radim Krčmář
2017-07-11 10:41                     ` Wanpeng Li
2017-07-11 15:04                       ` Radim Krčmář

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