Re: [Xen-users] substantial shutdown delay for PV guests with PCI -passthrough

[Atom2 <ariel.atom2@web2web.at>]

Am 02.04.14 16:44, schrieb Ian Jackson:
> Atom2 writes ("Re: [Xen-devel] [Xen-users] substantial shutdown delay for PV guests with PCI -passthrough"):
>> Am 21.03.14 19:11, schrieb Ian Jackson:
>>> Can you run it again with this, on top of the previous patch, please ?
>>
>> Sure, the new output of xl -vvv create -F domain is again attached to
>> this e-Mail.
>
> Sorry for the delay replying.  I have been ill :-(.
Sorry to hear that. Though I noticed your absence from the list I simply 
assumed that you were off on vacation. In any case good to see you back.
>
>> <NOTE: at this point a 10s pause happens>
>> libxl: error: libxl_device.c:1134:libxl__wait_for_backend_deprecated: Backend /local/domain/0/backend/pci/4/0 not ready (state 7)
>> libxl: error: libxl_device.c:1138:libxl__wait_for_backend_deprecated: FE /local/domain/4/device/pci/0 state 6
>> libxl: debug: libxl_pci.c:204:libxl__device_pci_remove_xenstore: pci backend at /local/domain/0/backend/pci/4/0 is not ready
>> libxl: error: libxl_pci.c:1250:do_pci_remove: xc_domain_irq_permission irq=16
>
> So the backend here is in state 7 (Reconfiguring), but the frontend is
> in state 6 (Closed).  I think this is a bug in pciback.
>
> I looked at drivers/xen/xen-pciback/xenbus.c in Linux 3.13 and found
> xen_pcibk_frontend_changed which seems to do roughly what I would
> expect.
>
> Has this changed at some point ?
>
> Atom, what kernel are you using ?
All the error messages stem from kernel 3.11.7. In the meantime 3.13.2 
became stable for gentoo and I installed that a few days ago. I have not 
run the debug output yet or timed the shutdown process, but there's 
still a delay with that kernel and it feels as long as before. I you 
want, I can clearly provide new debug output or timing information.

Thanks Atom2
>
> Thanks,
> Ian.
>
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