Re: [Xen-devel] PCI hotplug related issues

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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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