From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Wargo Subject: Re: Windows 8 VGA Passthrough Date: Mon, 28 Oct 2013 06:06:09 -0500 Message-ID: <526E4521.5060903@gmail.com> References: <526C2D06.1030606@gmail.com> <526CDD22.6080107@bobich.net> <526D22D9.6010006@gmail.com> <526D3D91.5090906@gmail.com> <526D6B11.5080803@bobich.net> <526D7F25.2020609@gmail.com> <526D98F0.1000906@bobich.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <526D98F0.1000906@bobich.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Gordan Bobic Cc: "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org On 10/27/2013 05:51 PM, Gordan Bobic wrote: > On 10/27/2013 09:01 PM, John Wargo wrote: >> On 10/27/2013 02:35 PM, Gordan Bobic wrote: >>> On 10/27/2013 04:21 PM, John Wargo wrote: >>>> On 10/27/2013 09:27 AM, John Wargo wrote: >>>>> On 10/27/2013 04:30 AM, Gordan Bobic wrote: >>>>>> On 10/26/2013 09:58 PM, John Wargo wrote: >>>>>>> Geniuses, >>>>>>> >>>>>>> I've been trying to get VGA pass-through working on Windows 8, >>>>>>> however >>>>>>> I've been running into a few issues. >>>>>>> Currently I can get Windows 8 running flawlessly without VGA >>>>>>> pass-through, however I'm planning on using it for gaming, so this >>>>>>> wont >>>>>>> work. >>>>>>> >>>>>>> When I start windows 8, I am able to get past the install >>>>>>> portion of >>>>>>> the >>>>>>> DVD, however it hangs on "Getting devices ready.. (n%)". >>>>>>> >>>>>>> Hardware Information : >>>>>>> AMD Fx6300 >>>>>>> ASUS M5a99x evo r2.0 >>>>>>> 16GB RAM >>>>>>> 6670 Radeon HD - Dom0 >>>>>>> 7850 Radeon HD - Win8 >>>>>> >>>>>> I have recently (recently as in over the past 48 hours) re-tried to >>>>>> get ATI VGA passthrough working, and the results are... interesting. >>>>>> >>>>>> HD4850 dom0 + HD7450 domU worked fine - or as fine as ATI >>>>>> passthrough >>>>>> ever seems to work (slowdown + white lines when dragging windows >>>>>> after a domU reboot). I am using XP64 domU so I can't eject the GPU >>>>>> (it says it is being used). But shutting down the domU, doing echo 1 >>>>>> > reset for the GPU from dom0 (I don't know how this is implemented >>>>>> and whether it does anything) and then starting it up again >>>>>> sometimes >>>>>> recovers it. GPU-Z runs and reports the GPU correctly. >>>>>> >>>>>> HD4850 dom0 + HD7970 domU results in the entire host locking up as >>>>>> soon as the driver is loaded in domU. My solution is to swap the >>>>>> dom0 >>>>>> GPU for an 8800GT, and the problem now doesn't occur. If I had to >>>>>> guess, BIOS on the HD7970 does something bizzare, finds the >>>>>> HD4850 on >>>>>> the bus, tries to do something to it, and ends up crashing the host. >>>>>> This could also be exacerbated by the fact that I have to run with >>>>>> relaxed checking and no PCI ACS due to NF200 bridges on my >>>>>> motherboard. Even so, however, GPU-Z crashes the domU and it's GPU >>>>>> _hard_ (but not the host, thankfully). It crashes it so hard, that >>>>>> the only cure is to reboot the host. Reseting the GPU via /sys/ >>>>>> doesn't seem to do anything to help. >>>>>> >>>>>> Are you using gfx_passthru=1 in your config? The way most people >>>>>> have >>>>>> this kind of thing working is with gfx_passthru=0, i.e. secondary >>>>>> passthru. Don't assign the PCI device in the config when installing. >>>>>> Once the domU install is complete, shut it down, and add the GPU you >>>>>> want to pass through. Then fire up domU in VNC, install the driver, >>>>>> and with a bit of luck it will come up with output on the external >>>>>> monitor. >>>>>> >>>>>> Also make sure that radeon or radeonfb kernel drivers DO NOT load >>>>>> before the device is assigned to xen-pciback. The exact way to >>>>>> ensure >>>>>> this will depend on what distro and dom0 kernel you are using. >>>>>> >>>>>> Gordan >>>>> Status update: >>>>> >>>>> The catalyst drivers appear to be working perfectly fine, device >>>>> manager shows no errors, and everything works great, except that when >>>>> I plug my monitor into the second card, I get "No Signal" on the >>>>> monitor, then it shuts off. >>>>> >>>>> I though that secondary passthrough meant that it would pass the >>>>> virtual adapter in as primary, but I could use my GPU that I passed >>>>> through, so where am I wrong, and how do I do that? >>>>> >>>>> -John >>>> I've been doing some research into my VGA passthrough, so I've gone >>>> through the various debugging steps, and the only thing that I've >>>> found >>>> out of place is with "xl dmesg" (attached). >>>> >>>> Where do I go from here? >>> >>> Sounds like your IOMMU may be buggy. You may need to set permissive=1 >>> on your xen-pciback module. >>> >>> I cannot remember if xl uses the same configuration, but for xm you >>> could try putting this in your /etc/xen/xend-config.sxp: >>> (pci-passthrough-strict-check no) >>> (pci-dev-assign-strict-check no) >>> >>> Gordan >>> >> Gordan, >> >> After a bit of research, I was able to activate permissive mode on xen, >> but I've got nothing, I'm still getting page faults. >> >> The page faults occur when the loading screen goes black (I'd assume >> when it's trying to pass to the GPU) >> >> I've also tried setting (pci_msitranslate=0, along with changing >> qemu=qemu-xen, but it doesn't help > > The correct incantation you seek is to put this in the config: > device_model_version="qemu-xen-traditional" > > Gordan Gordan, Sorry for the confusion, I think that's what I meant by changing "qemu=qemu-xen", and I've been running off of "qemu-xen-traditional" up until I changed it. I'm giving it another shot right now just in case though. -John