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[Xen-devel] Re: pause PV domain with pci passthrough

To: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: pause PV domain with pci passthrough
From: Keir Fraser <keir@xxxxxxx>
Date: Tue, 30 Nov 2010 14:13:40 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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On 30/11/2010 12:48, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:

> Hmm save isn't allowed with a pci device passed through:
> #xm save 14 /tmp/savedomain.xen
> Error: Migration not permitted with assigned PCI device.
> Would perhaps be wise to do that for pause as well when a pci device is
> assigned ?

Yes, probably. Why do you want to pause a domain, anyway? Is it actually
useful to be able to do that?

 -- Keir

> --
> Sander
> Tuesday, November 30, 2010, 1:36:59 PM, you wrote:
>> On 30/11/2010 12:14, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:
>>> Hi Keir/Konrad,
>>> Should it be possible to pause a PV domain ("xm pause") when it has pci
>>> devices passed through ?
>>> If not, should it work with a HVM with pci passthrough ?
>>> Trying with a PV domain gave troubles so far.
>> It might give problems with pending pass-thru interrupts not getting handled
>> by the paused domain? That could block other, more critical interrupts, like
>> for disc controllers in dom0. Just a theory. I wouldn't generally recommend
>> pausing any domain, as a guest OS could get upset getting descheduled for
>> significant periods of time without being told about it (as a PV guest is
>> for save/restore).
>>  -- Keir
>>> --
>>> Sander

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