From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gordan Bobic Subject: Re: Windows 8 VGA Passthrough Date: Sun, 27 Oct 2013 22:51:28 +0000 Message-ID: <526D98F0.1000906@bobich.net> 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> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <526D7F25.2020609@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: John Wargo Cc: "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org 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