Re: [Xen-devel] [Qemu-devel] Question about xen disk unplug support for ahci missed in qemu

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 16/10/2015 12:13, Anthony PERARD ha scritto:
> On Fri, Oct 16, 2015 at 10:32:44AM +0200, Fabio Fantoni wrote:
> > Il 15/10/2015 20:02, Anthony PERARD ha scritto:
> > > On Thu, Oct 15, 2015 at 06:27:17PM +0200, Fabio Fantoni wrote:
> > > > Il 14/10/2015 13:06, Stefano Stabellini ha scritto:
> > > > > I would suggest Fabio to avoid AHCI disks altogether and just use OVMF
> > > > > with PV disks only and Anthony's patch to libxl to avoid creating any
> > > > > IDE disks: http://marc.info/?l=xen-devel&m=144482080812353.
> > > > >
> > > > > Would that work for you?
> > > > Thanks for the advice, I tried it:
> > > > https://github.com/Fantu/Xen/commits/rebase/m2r-testing-4.6
> > > >
> > > > I installed W10 pro 64 bit with ide disk, installed the win pv drivers and
> > > > after changed to xvdX instead hdX, is the only change needed, right?
> > > > Initial boot is ok (ovmf part about pv disks seems ok) but windows boot
> > > > fails with problem with pv drivers.
> > > > In attachment full qemu log with xen_platform trace and domU's xl cfg.
> > > >
> > > > Someone have windows domUs with ovmf and pv disks only working? If yes can
> > > > tell me the difference to understand what can be the problem please?
> > > When I worked on the PV disk implementation in OVMF, I was able to boot
> > > a Windows 8 with pv disk only.
> > >
> > > I don't have access to the guest configuration I was using, but I think one
> > > difference would be the viridian setting, I'm pretty sure I did not set it.
> > I tried with viridian disabled but did the same thing, looking cdrom as
> > latest thing before xenbug trace in qemu log I tried also to remove it but
> > also in this case don't boot correctly, full qemu log in attachment.
> > I don't know if is a ovmf thing to improve (like what seems in Laszlo and
> > Kevin mails) or xen winpv drivers unexpected case, have you tried also with
> > latest winpv builds? (for exclude regression)
> No, I did not tried the latest winpv drivers.
>
> Sorry I can help much more that that. When I install this win8 guest tried
> to boot it with pv drivers only, that was more than a year ago. I have not
> check if it's still working. (Also I can not try anything more recent,
> right now.)
I did many other tests, retrying with ide first boot working but show pv 
devices not working, I did another reboot (with ide) and pv devices was 
working, after I retried with pv (xvdX) and boot correctly.
After other tests I found that with empty cdrom device (required for xl 
cd-insert/cd-eject) boot stop at start (tianocore image), same result 
with ide instead.
From xl cfg: 
disk=['/mnt/vm/disks/W10UEFI.disk1.cow-sn1,qcow2,xvda,rw',',raw,xvdb,ro,cdrom']
With seabios domU boot also with empty cdrom.
In qemu log I found only these that can be related:
> xen be: qdisk-51728: error: Could not open image: No such file or 
> directory
> xen be: qdisk-51728: initialise() failed
And latest xl dmesg line is:
> (d1) Invoking OVMF ...
If you need more informations/test tell me and I'll post them.

Thanks for any reply and sorry for my bad english.

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