Hey Joerg, Am Freitag, den 01.11.2013, 16:09 +0100 schrieb Joerg Roedel: > Hey Max, > > On Mon, Oct 28, 2013 at 10:17:19AM -0600, Alex Williamson wrote: > > On Wed, 2013-10-16 at 21:08 +0200, Max Schettler wrote: > > > Hi guys, > > > > > > Im trying to set up vga passthrough. I use the latest mainline kernel > > > (3.12rc5) and patched qemu (1.6.50). When i try to start a VM using this > > > command: > > > > > > qemu-system-x86_64 -enable-kvm -M q35 -m 1024 -cpu qemu64 > > > -bios /usr/share/qemu/bios.bin -vga none > > > -device > > > ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 > > > -device vfio-pci,host=06:00.0,bus=root.1,multifunction=on,x-vga=on > > > -device vfio-pci,host=06:00.1,bus=root.1 > > > > > > The screen attached to the passthroughed GPU turns on but does not show > > > any output. > > > Also I get some warnings from amd_iommu and my kernel messages are full > > > of AMD-Vi messages: > > > "AMD-Vi: Completion-Wait loop timed out" and > > > "AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=06:00.0 > > > address=0x0000000438544b90" > > > > > > If i dont stop the qemu process this eventually forces me to reboot > > > since the host gets unusable. > > > > > > I uploaded the whole dmesg output, if its of any help here: > > > http://pastebin.com/ki13dqEd > > > > > > My hardware is an AMD FX-8350 with an Gigabyte 970A-UD3 and a Gigabyte > > > 7870OC. > > > > > > Any help is much appreciated, thanks in advance! > > That's interesting, what GPU is it that you are trying to pass through > to the guest? It seems to be an ATS capable device. Either there is a > problem in the AMD IOMMU driver with handling ATS or there is a problem > with the hardware and ATS should not be enabled there. Either way, the > fix/workaround has to be in the AMD IOMMU driver. > > > Joerg I fixed this issue in the meanwhile by switching to another Mainboard, so I guess it was at least somehow associated with the Hardware. The first Setup was this one: AMD FX-8350 Gigabyte 970A-UD3 Gigabyte 7870GHz Edition Sapphire 6450 I switched to an Asrock 990FX Extreme3.
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