Hello list, I hope this is the right place for my question. If it is not, I'd be very happy if you pointed me in the right direction. I have an AMD A10 6800K APU with integrated graphics and I'm trying to pass that graphics adapter to a KVM guest. My mainboard is an ASRock FM2A75 Pro4 with latest firmware, so that it (supposedly) supports IOMMU. Since this is the first time I'm attempting this, I followed this guide: https://bbs.archlinux.org/viewtopic.php?id=162768 I'm running Debian wheezy amd64, mainline kernel 3.10 with the kernel-vfio-vga-reset patch mentioned in the link above, and qemu 1.5.1 with a corresponding patch (again, see link above.) Kernel config options I set that I assume are relevant: CONFIG_VFIO_IOMMU_TYPE1=y CONFIG_VFIO=y CONFIG_VFIO_PCI=y CONFIG_VFIO_PCI_VGA=y When I run qemu-system-x86_64 -enable-kvm -M q35 -m 1024 -cpu host -smp 2,sockets=1,cores=2,threads=1 -bios /home/gustav/myroot/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=00:01.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on -device vfio-pci,host=00:01.1,bus=root.1,addr=00.1 I receive the message qemu-system-x86_64: Attempt to reset PCI bus for VGA support failed (Device or resource busy). VGA may not work. Indeed the display output doesn't change, i.e. the login promt (on the console, there is no X installed) of the host doesn't vanish, and I don't get SeaBIOS output from the KVM guest. Next, I took a really old PCIe graphics card, installed it and set it to be my primary graphics adapter in BIOS (or rather UEFI?), so that I now saw POST and kernel messages via the dedicated GPU. Surprisingly to me, I was able to pass-through the dedicated PCIe card to a KVM guest, but still not the now supposedly unused integrated GPU, still getting the same message when I tried. After changing the primary graphics adapter to be the integrated one, I still wasn't able to pass through the integrated GPU, but was able to see SeaBIOS output if I passed the dedicated card to the guest. However in this case, the graphics output was a bit strange in that the space bewteen characters and lines was unusually large and I saw only what seemed to be part of the whole screen output. Since my integrated GPU is more powerful than the dedicated one, I'd like to know what I can try to pass it to a guest, or what I can do to find out why "Device or resource busy" is reported. Please let me know if you need any more data. Also please note that the computer is not in any kind of "production" use, so it wouldn't be a problem if some operation resulted in an unusable operating system, as long as there is no hardware damage. Any input is very highly appreciated. Thanks! -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
