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

[Gordan Bobic <gordan@xxxxxxxxxx>]

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

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