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Re: [Xen-devel] [PATCH v8 00/15] execute hotplug scripts from libxl

On Sun, 2012-07-08 at 14:32 -0400, Ian Campbell wrote:
> (resending as I don't think I had SMTP setup properly on my laptop -- sorry 
> if you get this twice!)
> On Wed, 2012-07-04 at 07:59 -0400, Roger Pau Monne wrote:
> > This new serie (v8) fixes a code refactoring problem that was present 
> > in v7 (06/15 changed code introduced by 05/15).
> From somewhere in here I'm seeing timeouts waiting for the b/e to go to
> state 5 when doing cd-insert on an HVM guest.

I should have said that it does actually seem to eventually succeed.

>  I suspect because this is
> (or should be) turned into a virtual media change rather than an actual
> device remove and insert?

I've not really got a clue how this is suppose to work, but looking at
tools/qemu-xen-traditional-dir/xenstore.c I see things like:
        fprintf(stderr,"medium change watch on ...
Experimentally it seems that ejecting the ISO can be done with:
         xenstore-rm /local/domain/0/backend/qdisk/45/5632/params 
and inserting with
        xenstore-write /local/domain/0/backend/qdisk/45/5632/params 
(whether you can skip eject to do a change I didn't check)

So I think the libxl_cdrom_insert alg needs to be something like:

        if (hvm)
                rewrite params key
                if stubdomid

        else /* pv */

where the libxl_device_disk_* are actually async initiations and a chain
of callbacks

Grepping around in xend I don't see where this used to be done, maybe it
wasn't. I can't see an xm equiv to xl cd-insert...


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