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Re: [Xen-devel] PATCH: 0/10: Merge xenfb & xenconsoled into qemu-dm

To: Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] PATCH: 0/10: Merge xenfb & xenconsoled into qemu-dm
From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
Date: Thu, 16 Aug 2007 13:49:39 +0100
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On Thu, Aug 16, 2007 at 08:30:08AM +0100, Keir Fraser wrote:
> On 15/8/07 21:00, "Daniel P. Berrange" <berrange@xxxxxxxxxx> wrote:
> > The only feature this re-factoring looses is the ability to have the 
> > paravirt
> > text console persistently logged to a file. QEMU allows us to specify that
> > a character device is either sent to a PTY, or a file, but not both at the
> > same time. I'm thinking about ways in which QEMU's character device config
> > syntax & drivers may be extended to allow use of a PTY & File concurrently.
> > 
> > The patches should be applied in order - after each individual patch you
> > should still have a fully operational system for both FV & PV.
> Have you tested both HVM and PV guests with save/restore, migration, and
> *failed* save/restore (e.g., by forcing an error in xc_domain_save.c)? The
> last needs care because qemu-dm must be kept around until the last moment,
> in case the save or migration fails.

I've not tested failed save/restore or migration - just normal save/restore
for FV & PV. I'll do some further testing of the scenarios you suggest. I
don't think I should have broken anything in qemu-dm for HVM because in the
HVM codepaths I merely moved code from one file to another. 

> Are these patches intended to be applied now, or are they RFC?

They could be applied now, but was expecting people might have some feedback
/recommendations for changes - Christian normally has lots of good comments
for QEMU related stuff. So if I have to do another revision of the patches 
I'm fine with it.

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