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Date:	Mon, 14 Jul 2014 19:43:04 +0200
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	konrad@...nel.org, xen-devel@...ts.xenproject.org,
	<boris.ostrovsky@...cle.com>, <david.vrabel@...rix.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v4] PCI back fixes for 3.17.


Monday, July 14, 2014, 7:37:53 PM, you wrote:

>> >> Ad B)
>> >> 
>> >> root@...0:~# xl pci-list router
>> >> Vdev Device
>> >> 05.0 0000:00:1b.0
>> >> 
>> >> root@...0:~# xl pci-assignable-list
>> >> 0000:02:00.0
>> >> 
>> >> root@...0:~# xl pci-detach router 00:1b.0
>> >> dmesg shows:
>> >> [  199.742668] pciback 0000:00:1b.0: restoring config space at offset 0x10 (was 0x4, writing 0xf7d30004)
>> >> [  199.743527] pciback 0000:00:1b.0: restoring config space at offset 0xc (was 0x0, writing 0x10)
>> >> [  199.744321] pciback 0000:00:1b.0: restoring config space at offset 0x4 (was 0x100000, writing 0x100006)
>> >> [  199.757184] xen-pciback pci-1-0: xen_pcibk_xenbus_remove freeing pdev @ 0xffff8800589fce40
>> >> [  199.758139] xen-pciback pci-1-0: xen_pcibk_disconnect pdev @ 0xffff8800589fce40
>> >> [  199.862595] xen: xen_unregister_device_domain_owner
>> >> 
>> >> xl dmesg shows:
>> >> (XEN) [2014-07-14 16:28:29] memory_map:remove: dom1 gfn=f3070 mfn=f7d30 nr=4
>> >> (XEN) [2014-07-14 16:28:29] io.c:322: d1: unbind: m_gsi=22 g_gsi=36 dev=00:00.5 intx=0
>> >> (XEN) [2014-07-14 16:28:29] io.c:390: d1 unmap: m_irq=22 dev=00:00.5 intx=0
>> >> (XEN) [2014-07-14 16:28:29] [VT-D]iommu.c:1579: d1:PCIe: unmap 0000:00:1b.0
>> >> (XEN) [2014-07-14 16:28:29] [VT-D]iommu.c:1440: d0:PCIe: map 0000:00:1b.0
>> >> 
>> >> root@...0:~# xl pci-list router
>> >> root@...0:~# xl pci-assignable-list
>> >> 0000:00:1b.0
>> >> 0000:02:00.0
>> >> 
>> >> root@...0:~# xl pci-assignable-remove 00:1b.0
>> >> dmesg shows:
>> >> [  318.827415] xen: xen_unregister_device_domain_owner
>> >> [  318.828771] xen: xen_unregister_device_domain_owner: ENODEV
>> >> [  318.930869] pciback 0000:00:1b.0: restoring config space at offset 0x10 (was 0x4, writing 0xf7d30004)
>> >> [  318.933435] pciback 0000:00:1b.0: restoring config space at offset 0xc (was 0x0, writing 0x10)
>> >> [  318.935877] pciback 0000:00:1b.0: restoring config space at offset 0x4 (was 0x100000, writing 0x100006)
>> >> 
>> >> root@...0:~# xl pci-list router
>> >> root@...0:~# xl pci-assignable-list
>> >> 0000:02:00.0
>> >> 
>> >> 
>> 
>> > And if you do:
>> 
>> > # xl pci-detach router 02:00.0
>> 

> Err, I meant
> # xl pci-assignable-remove 02:00.0

Ah ok .. so that is:
remove a device from pciback that has never been assigned to any guest .. 

will also give that a go .. although that probably won't be a problem. 

>> > Do you see it being cleared from pciback? And what do you
>> > see in /sys/bus/pci/drivers/pciback ?
>> 
>> Hmm good point .. i also had the plan to look into xenstore what was in there .. 
>> but forgot .. will post both right away :-) 

> Thank you!
>> 
>> > Thanks!
>> 
>> 


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