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Re: [Xen-devel] what will happen for a floated vcpu?

  • To: Dario Faggioli <dario.faggioli@xxxxxxxxxx>, xen devel <xen-devel@xxxxxxxxxxxxx>
  • From: tutu sky <ooohooo_u@xxxxxxxxxxx>
  • Date: Thu, 31 Mar 2016 16:27:07 +0000
  • Accept-language: en-US
  • Delivery-date: Thu, 31 Mar 2016 16:27:28 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>
  • Thread-index: AQHRifZHEpnkKSvyeEmT1s+K/myUaJ9zuQkAgAAFMGY=
  • Thread-topic: [Xen-devel] what will happen for a floated vcpu?

Thanks Dario,
Yeah, you are totally right, but software crashes are almost a result of 
hardware faults. I mean if a part of a core for example register file or maybe 
floating point unit or even ALU, suddenly stop working or does malfunction, 
what will happen for the corresponding vcpu which it is running? Does that vcpu 
crash (as a part of a software) or migrate to another core? You just please 
imagine recoverable faults. Has Xen any plan for deal with such a situation? 
what exactly will happen to that vcpu according to that fault (I mean what will 
be done next)?


From: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Sent: Thursday, March 31, 2016 4:00 PM
To: tutu sky; xen devel
Subject: Re: [Xen-devel] what will happen for a floated vcpu?

On Tue, 2016-03-29 at 20:06 +0000, tutu sky wrote:
> Hi,
> I need to know what happens while a cpu which is running a vcpu,
> suddenly crash or down? I mean have xen any plane for such a
> situation?
I don't understand the question: what does it mean for a cpu to
"suddenly crash"?

It's typically software that crashes. Hardware failures are possible,
of course, but whether they are recoverable or not, and whether there
are plans/code to do that, would depend on what failure we're actually
talking about.

<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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