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Re: [Xen-devel] [RFC Patch] Support for making an E820 PCI hole in tools

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] [RFC Patch] Support for making an E820 PCI hole in toolstack (xl + xm)
From: Keir Fraser <keir@xxxxxxx>
Date: Mon, 15 Nov 2010 19:57:47 +0000
Cc: stefano.stabellini@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, bruce.edge@xxxxxxxxx, gianni.tedesco@xxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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Thread-topic: [Xen-devel] [RFC Patch] Support for making an E820 PCI hole in toolstack (xl + xm)
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On 15/11/2010 19:32, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:

>> Or, is there much disadvantage, to having a static really big PCI hole? Say
>> starting at 1GB? The advantage of this would be the ability to hotplug PCI
>> devices to a domU even across save/restore/migrate -- this may not work so
>> well if you commit yourself to the hole size of the original host, and the
>> restore/migrate target host has a bigger hole!
> Well, the other question is whether the devices have to have the same
> pfn as mfn within the hole.  We're emulating the PCI config space anyway
> - couldn't we stick the passthrough PCI space at 3G regardless of where
> it is on the real hardware?

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.

 -- Keir

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