This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


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

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] [RFC Patch] Support for making an E820 PCI hole in toolstack (xl + xm)
From: Keir Fraser <keir@xxxxxxx>
Date: Tue, 16 Nov 2010 07:40:35 +0000
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, bruce.edge@xxxxxxxxx, gianni.tedesco@xxxxxxxxxx, stefano.stabellini@xxxxxxxxxxxxx
Delivery-date: Mon, 15 Nov 2010 23:42:37 -0800
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:user-agent:date :subject:from:to:cc:message-id:thread-topic:thread-index:in-reply-to :mime-version:content-type:content-transfer-encoding; bh=Da0JvNmqYOXvwcWaVMjZEVEP5TQVphgjmZFyCFe4+bI=; b=rIRTkTt73DcWYDV0PPtIE8H4v364XkEUwBvlk/bR9F3nl4KR7X1fH1WLy9U23xsNXG SONUsJn0WZsub9NzpT7OdaO1+/QoabBy3S4ID65UECRA97Exz5D5np5FkwYiZnpYD7MQ vLke2SawYnWFqV1bEeLzqEDriZZuStoezpM+k=
Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:user-agent:date:subject:from:to:cc:message-id:thread-topic :thread-index:in-reply-to:mime-version:content-type :content-transfer-encoding; b=F1n/GgNtHpNgdAxYcIquYYviOoHLGMYd5PqK8SRnfLag/FvvjK9lDGDuoC72LP/09e legIl1agFt0sxJU02BBq/ui7VeJ4QKHJxBU4zNT59Bws5Q4mESwieJz/C4JvOlJXl9KK NlmB76OvC/Y9Es1RdFiD3Ptg+nfOG77Z2/2+Q=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20101115231133.GA12364@xxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcuFYY3yh5vFIQocrUep7ZSANrt60A==
Thread-topic: [Xen-devel] [RFC Patch] Support for making an E820 PCI hole in toolstack (xl + xm)
User-agent: Microsoft-Entourage/
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

Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>