From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gordan Bobic Subject: Re: Windows 8 VGA Passthrough Date: Sun, 27 Oct 2013 19:28:30 +0000 Message-ID: <526D695E.709@bobich.net> References: <526C2D06.1030606@gmail.com> <526CDD22.6080107@bobich.net> <526D1FBA.10708@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <526D1FBA.10708@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 , "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org On 10/27/2013 02:14 PM, 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 > > After messing with a few of the options, and a bit of trickery, It > appears that I've got it passed-through, however when viewing it in the > device manager I get Error Code 43 : Not enough system resources. I'm > currently working on installing the latest stable drivers from AMD on > hopes that it will fix it, however I don't see it making a ton of > difference. > > Is there some sort of patch I need to apply, or something I'm missing? Are you using traditional or upstream qemu? Gordan