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Re: [Xen-devel] [PATCH 4 of 5] libxl: Add support for passing in the mac

To: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 4 of 5] libxl: Add support for passing in the machine's E820 for PCI passthrough
From: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Date: Fri, 8 Apr 2011 15:33:47 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, "keir.fraser@xxxxxxxxxxxxx" <keir.fraser@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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On Fri, 2011-04-08 at 15:25 +0100, Tim Deegan wrote:
> At 15:17 +0100 on 08 Apr (1302275848), Ian Campbell wrote:
> > > That's a _horrible_ config syntax.
> > 
> > fair enough. I thought it nicely represented the "has an empty PCI bus"
> > myself...
> Sure, but it's really not obvious that that means "has a memory layout
> that matches the host on which it was last booted".

Hmm, yes, this proposal doesn't really cover migration does it...

You obviously can't migrate with a device passed through but it should
be possible to unplug, migrate and replug. Maybe having a sensible hole
on the first host is sufficient... Especially if the annoying case is
GFX passthrough -- you are much less like to want/be able to unplug your
gfx over a migration...


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