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 11:29:01 +0100 Message-ID: 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> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <51E7C158.5090706@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 18:20:08 +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