Re: [Xen-devel] [RFC Patch] Support for making an E820 PCI hole in toolstack (xl + xm)

[Keir Fraser <keir@xxxxxxx>]

On 15/11/2010 23:11, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx> wrote:

>> Well, I don't know. It sounds pretty sensible to me. :-)
>> 
>> Certain virtualisation feature sdisappearing after a save/restore/migrate --
>> or worsse, becoming unreliable -- would be a bit sad.
> 
> So having the option of the PCI hole being passed through, and giving
> the tools the value (pci_hole) would mean we could migrate an SR-IOV type
> device from one machine to another. Constructing the PCI hole using the
> XENMEM_machine_memory_map could generate different E820 for the two guests,
> which
> would be indeed a bit sad.

SR-IOV is a nice example, but even assuming the user does not have pass-thru
devices attached during migrate, or save/restore, it would still be nice if
they could have the pci-hotplug-passthru facility available to them fully
working both before and after such an event.

 -- Keir



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