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 20:03, Gordan Bobic wrote:
> On Thu, 18 Jul 2013 19:23:58 +0800, "Singapore Citizen Mr. Teo En Ming 
> (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > On 18/07/2013 19:02, Gordan Bobic wrote:
> > > On Thu, 18 Jul 2013 18:55:55 +0800, "Singapore Citizen Mr. Teo En 
> > > Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > > On 18/07/2013 18:44, Gordan Bobic wrote:
> > > > > On Thu, 18 Jul 2013 18:40:51 +0800, "Singapore Citizen Mr. Teo En 
> > > > > Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > > > > On 18/07/2013 18:29, Gordan Bobic wrote:
> > > > > > > On Thu, 18 Jul 2013 18:20:08 +0800, "Singapore Citizen Mr. Teo 
> > > > > > > En Ming (Zhang Enming)" <singapore.mr.teo.en.ming@xxxxxxxxx> wrote:
> > > > > > > > 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.
> > > > > > > > > > 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?
> > > > > > > > I have checked "lsmod | grep i915" and the command doesn't return
> > > > > > > > anything, which means the kernel module i915 is not loaded in 
> > > > > > > > dom0.
> > > > > > > Check lspci -vvv,find the device in the output and look for the 
> > > > > > > lines that say:
> > > > > > > Kernel driver in use:
> > > > > > > Kernel modules:
> > > [...]
> > >
> > > > > > I have checked lspci -vvv in Ubuntu 13.04 dom0 and the Kernel driver
> > > > > > in use is pciback for Intel HD Graphics 4600 IGD.
> > > > > >
> > > > > > As for Fedora 19 HVM domU, I don't know because I cannot start it.
> > > > > Starting is not required to do this. Do it before starting the domU.
> > > > Sorry, I don't understand what you're trying to say.
> > > On F19, don't worry about starting the domU. In dom0, do lspci -vvv,
> > > find the Intel graphics device in the output and find what kernel
> > > driver / module are bound to it, if any. You can only pass through
> > > a PCI device that is connected to the xen pciback driver, and even
> > > then often only if no other driver had connected to the device first
> > > since that might leave it in an unknown state.
> > But I can only start Fedora 19 HVM domU with-out vga passthrough. I
> > want to be able to start Fedora 19 HVM domU with vga passthrough.
> You are trying to get one step ahead of what I am talking about.
> Forget domU for the moment. Before you can even begin thinking
> about the domU you have to make sure the device is available
> for assigning in dom0. If you have a driver bound to the device
> in dom0 you cannot pass it through to domU. So forget domU until
> you have actually confirmed there is no driver bound to the
> device in dom0.
>
> What do the following two lines say for the device in lspci -vvv
> in _dom0_ on Fedora:
> Kernel driver in use:
> Kernel modules:
>
> Gordan
>
> _______________________________________________
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> http://lists.xen.org/xen-devel
Dear Gordan,

I have attached the output of lspci -vvv in Ubuntu 13.04 dom0. The 
filename of the attachment is dom0-lspci.txt.
--
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)

Attachment: dom0-lspci.txt
Description: Text document

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