Re: [Xen-devel] [win-pv-devel] Question about windows domU long boot time in xen and help for update libxl virtio patch (for a test)

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 11/05/2015 16:13, Wei Liu ha scritto:
> On Mon, May 11, 2015 at 03:53:44PM +0200, Fabio Fantoni wrote:
>
> [...]
>
> > > > > > Can someone help me to complete/fix it please?
> > Can someone help me about virtio disks support in libxl please?
> >
> > After this reply about seabios seems can be useful try virtio:
> > http://lists.xen.org/archives/html/xen-devel/2015-05/msg01257.html
> >
> > Thanks for any reply and sorry for my bad english.
> Porting that patch to nowadays Xen requires certain amount of effort.
> And I'm not sure I want it merged now because virtio on Xen has not been
> standardised -- there was effort but now it seems to be stalled. In the
> end this patch is going to be outdated again and porting effort wasted.
>
> Another thing is that virtio might be faster when *vm is booting* but
> it's not necessary faster when *vm is running*.
>
> So I would rather we figure out a way to make Seabios enable those
> options or teach our toolstack to enable the right option for qemu (if
> that can be done).
>
> Wei.
Thanks for your reply,
Probably add support for AHCI is better and faster options as you told.
I tried it long time ago trying to add it as part of add support for q35 
in xen.
I saw that with ahci add ich9 controller is needed and also switch disks 
to new qemu parameters -device.
But on my old tests I had problem to switch to -device all disks things 
and case because automatic bus selection for ide had a bug I was unable 
to solve and I hadn't replies with help :(
More exactly the change to new -device parameters should be done in 
libxl_dm.c to these lines:
    flexarray_append(dm_args, "-drive");
    flexarray_append(dm_args, drive);
and all cases of "drive" definition above.
Doc about new qemu parameters is here:
http://git.qemu.org/?p=qemu.git;a=blob;f=docs/qdev-device-use.txt;hb=HEAD

I not found my old tests posts with all details but only this newer with 
few details:
http://lists.xen.org/archives/html/xen-devel/2014-02/msg02380.html

Someone already started to do new disks qemu parameters support in libxl 
and/or AHCI support?
If not and I'll retry to do it someone can help me  on possible 
problem/bugs?
Thanks for any reply and sorry for my bad english.


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