Re: [Xen-devel] Cannot start Fedora 19 HVM domU with VGA passthru

["Singapore Citizen Mr. Teo En Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx>]

On 18/07/2013 18:09, Gordan Bobic wrote:
> On Thu, 18 Jul 2013 18:07:27 +0800, "Singapore Citizen Mr. Teo En Ming 
> (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > On 18/07/2013 16:46, Gordan Bobic wrote:
> > > On Thu, 18 Jul 2013 16:37:34 +0800, "Singapore Citizen Mr. Teo En 
> > > Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > > Although Fedora 19 HVM domU with VGA passthrough cannot start, Debian
> > > > 7.1.0 amd64 HVM domU with VGA passthrough can start. In Debian 7.1.0
> > > > amd64 HVM domU with VGA passthrough, Intel HD Graphics 4600 is listed
> > > > in lspci -vvv. Please refer to lspci.txt. It is strange that no kernel
> > > > module is being loaded for Intel HD Graphics 4600. There is no "Kernel
> > > > driver in use" statement after VGA compatible controller: Intel
> > > > Corporation Haswell Integrated Graphics Controller (rev 06) (prog-if
> > > > 00 [VGA controller]).
> > > >
> > > > No kernel driver is seen in lsmod. Please refer to lsmod.txt
> > > >
> > > > When I tried to load the kernel module by executing "modprobe i915",
> > > > it complains "no such device".
> > > >
> > > > ERROR: could not insert 'i915': No such device
> > > >
> > > > So is my Intel HD Graphics 4600 VGA Passthrough to Debian 7.1.0 amd64
> > > > HVM domU considered successful since the i915 driver cannot be loaded?
> > > >
> > > > Thank you very much.
> > > If you have a driver in dom0 claiming the device (other than the 
> > > xen-pciback
> > > driver), you cannot pass through that device. If you do lspci -ccc 
> > > on F19
> > > and you see the driver in use for that device being something other 
> > > than
> > > xen-pciback, that would explain why you can't pass it through.
> > >
> > > Also, did you first do xl pci-assignable-add for that device? This 
> > > attempts
> > > to detach the device from it's current driver but doesn't always work
> > > especially for GPUs. The only solution is blacklist the driver for the
> > > device in dom0. The downside is that you cannot run a GUI in dom0 on 
> > > that
> > > device.
> > >
> > > Gordan
> > Dear Gordan,
> >
> > I cannot start Fedora 19 HVM domU with VGA passthrough at all. Could
> > you advise me on the workaround?
> >
> > As for the Intel HD Graphics (i915) driver, I have it blacklisted in
> > /etc/modprobe.d/blacklist.conf already. Please refer to attached
> > blacklist.conf.
> Have you confirm that no other driver is bound to the device in lspci 
> -vvv?
> Also what version of Xen are you running on each of the distros, and 
> which
> dom0 kernel?
>
> Gordan
Dear Gordan,

I have checked "lsmod | grep i915" and the command doesn't return 
anything, which means the kernel module i915 is not loaded in dom0.
I am running Xen 4.4-unstable changeset 27238 with Linux kernel 
3.11.0-rc1 on a Ubuntu 13.04 host.
--
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)


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