From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gordan Bobic Subject: Re: Cannot start Fedora 19 HVM domU with VGA passthru Date: Thu, 18 Jul 2013 11:44:01 +0100 Message-ID: <6ea9f69987a517fe0b1eca8ff677ebf3@mail.shatteredsilicon.net> References: <51E6B95E.3020500@gmail.com> <20130717215625.GL2924@reaktio.net> <51E7A94E.50005@gmail.com> <6d8cfa90cde86eca5915ff398872b459@mail.shatteredsilicon.net> <51E7BE5F.8000504@gmail.com> <51E7C158.5090706@gmail.com> <51E7C633.6080005@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <51E7C633.6080005@gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: singapore.mr.teo.en.ming@gmail.com Cc: xen-users@lists.xen.org, xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On Thu, 18 Jul 2013 18:40:51 +0800, "Singapore Citizen Mr. Teo En Ming (Zhang Enming)" 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)" 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)" 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)" >>>>>> 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