linux-kernel - Re: [Xen-devel] [PATCH v4] PCI back fixes for 3.17.

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Message-ID: <20140714202531.GA24877@laptop.dumpdata.com>
Date:	Mon, 14 Jul 2014 16:25:31 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
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.

> >> > Thank you for reporting it and helping me with the XenStore output to
> >> > narrow down the culprit!
> >> 
> >> The thing i don't understand then is:
> >> How is it different for the last (or all ) device(s) ?
> >> (since the last device (or removing all devices) before doing the 
> >> assignable-remove doesn't trigger the warning)
> >> 
> >> Or does the complete removal of the pci-part of the tree in xenstore trigger something ?
> 
> > Yup. It removes the whole 'pci' directory in XenStore which triggers
> > in Xen pciback the code to deal with that.
> So that essentially needs to be changed to watch the individual devices in the 
> xenstore tree instead of the whole pci stuff.

Correct. Thought instead of watching it will just compare with what it
had assigned to a guest and what it currently has exposed in XenStore. And
then whatever is not on the list (exposed in XenStore) is going to be reaped.

> Then it all makes sense :-)  

Until you find another bug :-)
> 
> >> You know if you got a patch cooked up, i'm more than happy to test !
> 
> > Hehe!
> >> 
> >> --
> >> Sander
> >> 
> 
> 
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