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 18:44, 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@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
>

Sorry, I don't understand what you're trying to say.

-- 
Yours sincerely,

Singapore Citizen Mr. Teo En Ming (Zhang Enming)