From: "Longpeng (Mike)" <longpeng2@huawei.com>
To: Jan Beulich <JBeulich@suse.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: Tue, 14 Mar 2017 09:11:37 +0800 [thread overview]
Message-ID: <58C74349.8060800@huawei.com> (raw)
In-Reply-To: <58C692C20200007800142737@prv-mh.provo.novell.com>
Hi Jan,
On 2017/3/13 19:38, Jan Beulich wrote:
>>>> 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,
Yep, I agree. I just do this for special purpose.
> 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.
Thanks. :)
>
> Jan
>
>
> .
>
--
Regards,
Longpeng(Mike)
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next prev parent reply other threads:[~2017-03-14 1:12 UTC|newest]
Thread overview: 4+ 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
2017-03-14 1:11 ` Longpeng (Mike) [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-03-13 6:12 Longpeng (Mike)
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