Re: Cannot start Fedora 19 HVM domU with VGA passthru

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

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
>
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>

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.

-- 
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)