On Wed, Oct 9, 2013, at 8:53, Roger Pau Monné wrote:
> On 09/10/13 13:49, Mark Felder wrote:
> > On Wed, Oct 9, 2013, at 2:46, Roger Pau Monné wrote:
> >> On 09/10/13 08:18, Shanker Balan wrote:
> >>> On 08-Oct-2013, at 9:19 PM, Mark Felder <f...@freebsd.org> wrote:
> >>>
> >>>> On Tue, Oct 8, 2013, at 9:45, Josias L.G wrote:
> >>>>> Problem with Citrix Xen 6.2 and install from ISO. The "solution" was
> >>>>> remove cd-rom drive from virtual machine. Not possible now with xen
> >>>>> default in GENERIC kernel.
> >>>>> Message error: 
> >>>>> run_interrupt_driven_hooks - still waiting after 300 seconds for
> >>>>> xenbusb_nop_confighook_cb
> >>>>> panic: run_interrupt_driven_config_hooks: waited too long
> >>>>>
> >>>>
> >>>> I was going to test this soon... but you're right -- you probably can't
> >>>> install FreeBSD 10 from ISO on Citrix XenServer because of this bug.
> >>>>
> >>>> Can someone working on the xen bits test and maybe find a workaround?
> >>>
> >>> The "xenbusb_nop_confighook_cb" issue is the only issue which I am aware
> >>> of that prevents CloudStack/XenServer IaaS private clouds from offering
> >>> FreeBSD 10 as a supported OS template. The "vbd-destroy" workaround is not
> >>> possible as the ISO is attached to the VM instance during the 
> >>> installation.
> >>>
> >>> A "please pretty please" request to @citrix R&D for the hopefully last fix
> >>> to get FreeBSD 10 running on XenServer+CloudStack.
> >>>
> >>> The earlier HyperV related panic on XenServer has been fixed in ALPHA5.
> >>
> >> Hello,
> >>
> >> I've taken a look into this and I'm afraid there's no easy way to
> >> workaround it from FreeBSD. When Xen is detected all IDE devices are
> >> disconnected, and there's no fine grained way to only disable IDE disks
> >> and not cdrom devices.
> >>
> >> Could you please contact your XenServer representative, and/or submit
> >> this bug to xs-devel (xs-de...@lists.xenserver.org) mailing lists in
> >> order to get this fixed on XenServer.
> >>
> > 
> > Citrix is aware of this as I've contacted several people there and this
> > has been discussed both here and on the xs-devel list. There has to be
> > something FreeBSD can do to work around this issue since Linux and
> > NetBSD have no issues.
> 
> Linux and NetBSD have no issues because you probably only tried them on
> PV mode, which doesn't exhibit this issue (also NetBSD doesn't have
> PVHVM support, so it's quite clear it won't have this issue).
> 
> > As far as I'm aware the issue has been tracked
> > down to badly behaving qemu in XenServer -- they don't use upstream qemu
> > in XenServer (yet), and instead have their own fork. A future release is
> > supposed to merge with upstream qemu.
> 
> The main problem here is that XenServer announces a PV block device on
> xenstore (the cdrom), but then it seems like there's no backend to
> handle it, so it hangs on the connection phase. IMHO the problem is not
> with the device model (Qemu), but with the backend that should handle
> this PV device.
> 
> Xen only allows you to either disable all IDE devices or none, so the
> only possible solution I can think of is to not disable anything at all
> and use the emulated devices, which will leave us with very poor
> performance (unless I'm missing something, there's no way to only
> disable disks but not cdroms).
> 
> > But the fact remains that this is a non-issue on Linux and NetBSD who
> > handle this buggy virtual CDROM without any problems. There has to be
> > some way we can add a quirk on our side so this device doesn't stop the
> > entire boot process. If FreeBSD 10 is released without out-of-the-box
> > support on the premier commercial Xen platform we'll be shooting
> > ourselves in the foot and all of this work will be for naught. Amazon
> > isn't the only Xen platform people use.
> 
> You can always use the pre-build VM images I guess (I have not tested
> those, but I expect they should work fine under Xen).
> 
> ftp://ftp.nl.freebsd.org/pub/FreeBSD/snapshots/VM-IMAGES/20131007/10.0-ALPHA5/amd64/
> 

Thanks for the reply and further details. I'm hoping I can import the VM
image onto a 6.2 server today and see what happens.
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