Re: Cannot start Fedora 19 HVM domU with VGA passthru

[Gordan Bobic <gordan@bobich.net>]

 On Thu, 18 Jul 2013 18:40:51 +0800, "Singapore Citizen Mr. Teo En Ming 
 (Zhang Enming)" <singapore.mr.teo.en.ming@gmail.com> 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@gmail.com> 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@gmail.com> 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@gmail.com> 
>>>>>> 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:
>>
>> The kernel driver might not be called the same thing in both 
>> kernels.
>>
>>> I am running Xen 4.4-unstable changeset 27238 with Linux kernel
>>> 3.11.0-rc1 on a Ubuntu 13.04 host.
>>
>> And on F19?
>>
>> Gordan
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel
>>
>
> Dear Gordan,
>
> 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.

 Gordan