Re: [Xen-devel] Xen pci-passthrough problem with pci-detach and pci-assignable-remove

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Friday, January 10, 2014, 6:38:10 PM, you wrote:

>> > Wow. You just walked in a pile of bugs didn't you? And on Friday
>> > nonethless.
>> 
>> As usual ;-)

> Ha!
> ..snip..
>> >> [  489.082358]  [<ffffffff81087ac6>] ? mutex_spin_on_owner+0x38/0x45
>> >> [  489.106272]  [<ffffffff818e5e22>] ? schedule_preempt_disabled+0x6/0x9
>> >> [  489.130158]  [<ffffffff818e7034>] ? __mutex_lock_slowpath+0x159/0x1b5
>> >> [  489.154147]  [<ffffffff818e70a6>] ? mutex_lock+0x16/0x25
>> >> [  489.177890]  [<ffffffff8135972d>] ? pci_reset_function+0x26/0x4e
>> 
>> > Yeah, that bug my RFC patchset (the one that does the slot/bus reset) 
>> > should also fix.
>> > I totally forgot about it !
>> 
>> Got a link to that patchset ?

> https://lkml.org/lkml/2013/12/13/315

>> I at least could give it a spin .. you never know when fortune is on your 
>> side :-)

> It is also at this git tree:

> git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git and the
> branch name is "devel/xen-pciback.slot_and_bus.v0". You will likely
> want to merge it in your current Linus tree.

> Thank you!


Hi Konrad,

Just got time to test this some more, when merging this branch *except* the 
last commit (9599a5ad38a3bb250e996ccb2cdaab6fb68aaacd)
seems to help with my problem,i'm no capable of using:
- xl pci-detach
- xl pci-assignable-remove
- echo "BDF" > /sys/bus/pci/drivers/<devicename>/bind

to remove a pci device from a running HVM guest and rebinding it to a driver in 
dom0 without those nasty stacktraces :-)
So the first 4 seem to be an improvement.

That last commit (9599a5ad38a3bb250e996ccb2cdaab6fb68aaacd) seems to give 
troubles of it's own.

--
Sander


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