anil.rao at ericsson
Jun 6, 2012, 11:03 AM
Post #7 of 7
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.
From: Ian Campbell [mailto:Ian.Campbell [at] citrix]
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 [at] ericsson> 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.
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