Re: [Xen-devel] PCI hotplug related issues

[Anil Rao <anil.rao@xxxxxxxxxxxx>]

Thanks, Jan and Ian for your confirmation and suggestions. For the moment, I 
have incorporated a workaround that is allowing us to proceed with our 
particular usage of Xen based VMs. 

When I free up a little bit at work, I don't mind taking a stab at getting this 
to work. I'll keep the list posted.

Anil


-----Original Message-----
From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx] 
Sent: Wednesday, June 06, 2012 2:29 AM
To: Jan Beulich
Cc: Anil Rao; xen-devel
Subject: Re: [Xen-devel] PCI hotplug related issues

On Wed, 2012-06-06 at 08:36 +0100, Jan Beulich wrote:
> >>> On 05.06.12 at 20:01, Anil Rao <anil.rao@xxxxxxxxxxxx> wrote:
> > After encountering this problem, I was afraid that only VM-level 
> > hotplug is supported by Xen (and not true hotplug at the 
> > host-level). Can someone kindly confirm that this is the case? Our 
> > current effort depends on host-level hotplug of a PCI device that 
> > can (later) be assigned (hotplugged) to a running VM, so a 
> > definitive answer will help us to avoid going down the wrong path.
> 
> That is not a proper statement - host side holtplug is still 
> supported, just that currently it may need to happen before the target 
> VM gets created. Overcoming limitations like this is certainly 
> desirable, but will obviously require someone to actually invest work 
> - the question would hence be whether, given that you're interested in 
> this feature and posted on xen-devel, you wouldn't also want to look 
> into addressing this (provided my brief analysis of the situation is 
> correct at all).

Yes, patches to make this work would be gratefully received.

As an aside, I wonder if upstream qemu does anything better here -- that would 
probably be the right place to look at adding this new feature in any case.

Ian.


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