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

From: Anthony PERARD <anthony.perard@citrix.com>
To: Fabio Fantoni <fabio.fantoni@m2r.biz>
Cc: Kevin Wolf <kwolf@redhat.com>,
	qemu-block@nongnu.org,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	Paul Durrant <paul.durrant@citrix.com>,
	John Snow <jsnow@redhat.com>
Subject: Re: [Qemu-devel] Question about xen disk unplug support for ahci missed in qemu
Date: Fri, 16 Oct 2015 11:13:18 +0100	[thread overview]
Message-ID: <20151016101318.GB1317@perard.uk.xensource.com> (raw)
In-Reply-To: <5620B62C.3040800@m2r.biz>

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.)

-- 
Anthony PERARD