Re: [Xen-devel] xl shutdown --wait "racy"

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Wednesday, April 16, 2014, 4:13:59 PM, you wrote:

> On Wed, 2014-04-16 at 16:08 +0200, Sander Eikelenboom wrote:
>> Hi Ian (C|J) Konrad,
>> 
>> I'm currently trying to workaround the pci-(detach|assignable-remove) issues 
>> i 
>> reported earlier. 
>> 
>> The workaround i thought of was:
>> - shutting down the guest
>> - starting it without 1 of the original devices passed through
>> - use xl pci-assignable-remove and bind the device to the dom0 driver.
>> 
>> But during this i noticed that a "xl shutdown --wait" does wait .. but 
>> returns:
>> - Before the domain is removed from for instance "xl list", it still listed 
>> there in 
>> "--ps--" state.
>> - before pciback has done it's restore config space magic.
>> 
>> So it seems the wait loop is exiting somewhat prematurely, is this expected 
>> ? 

> It is waiting for the domain to be shutdown (state 's') not for the
> domain to be destroyed. So it's doing what it said it would (I
> appreciate you might not find this distinction helpful under the
> circumstances...)

It's at least not entirely what i expected ;-)

Is it because there can be different "follow-up actions" due to the 
"on_poweroff=" config option ?

I can see the shutdown state would be the thing to wait for if it's configured 
with "preserve", but if it's configured with the default "destroy" i would 
expect it to wait until the guest is actually destroyed. The "restart" is 
perhaps 
somewhat more difficult, same goes for the coredump variants.


> Ian.




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