On Fri, Jan 7, 2011 at 7:24 PM, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote: > On Fri, Jan 07, 2011 at 05:47:59PM +0000, Prasad Joshi wrote: >> 2011/1/7 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>: >> >> > The errors >> >> > >> >> > [ 3.778476] [drm:r100_ring_test] *ERROR* radeon: ring test failed >> >> > (sracth(0x15E4)=0xCAFEDEAD) >> >> > [ 3.781010] [drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22). >> >> > [ 3.782542] radeon 0000:00:04.0: failled initializing CP (-22). >> >> > [ 3.784006] radeon 0000:00:04.0: Disabling GPU acceleration >> >> > >> >> > Seem to be disabling GPU functionality. For now, I am interested in >> >> > Graphics functionality of the ATI card and not GPGPU functionality. >> >> > >> >> > I will appreciate if you can help me with some information on solving >> >> > this problem. Let me know if I should be asking this question on >> >> > another forum. Please keep me in CC. >> >> >> >> Looks like dri-devel material, added to CC. >> >> >> >> As a first guess, maybe the system memory pages accessed by the GPU GART >> >> aren't the same ones intended for this by the VM. >> > >> > I actually have patches for that (sorry for the late reply). >> > >> > Try: >> > git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git devel/ttm.pci-api.v3 >> > >> > But I am not sure if they would make any difference here. You said >> > you are using KVM-QEMU - you must also be using an IOMMU? Does the IOMMU >> > give you any errors? >> > >> >> Yes I want to pass-through the ATI Radeon card to VM in KVM. I have >> enabled the IOMMU support and it works perfectly alright. I tried >> passing through a network card it worked. >> >> Should I try the patch you suggested? > > Go for it. I am still at lost why you would see those errors unless.. Tried your patches on Guest machine, it did not help. I am attaching the messages from guest machine. > well, what is the DMA code that gets turned on when you run your guest? Looking into the qemu-kvm code to find more information about DMA. > What do you see for 'PCI-DMA' ? > Is it bounce buffer or swiotlb? It is the default configuration. I did not pass swiotlb parameter on kernel boot line. The host kernel is booted with iommu=1. > How much memory do you pass to the guest? less than 4GB? root@prasad-kvm:~/VMDisks# qemu-system-x86_64 -hda Ubuntu-10.10-amd64.img -m 1024M -device pci-assign,host=02:00.0 I am passing 1GB memory to the guest machine. > I have 2 graphics cards (Nvidia and ATI) attached to my system. The Nvidia graphics card is used by host machine and I am trying to assign the ATI graphics card to the Guest machine. When I unbind the ATI graphics card from the host machine I see these messages on the host machine Jan 10 11:59:15 prasad-kvm kernel: [ 3396.912767] pci-stub: invalid id string "" Jan 10 11:59:59 prasad-kvm kernel: [ 3441.180601] pci-stub 0000:02:00.1: claimed by stub Jan 10 12:00:08 prasad-kvm kernel: [ 3449.901870] [drm] radeon: finishing device. Jan 10 12:00:08 prasad-kvm kernel: [ 3449.902161] [drm] radeon: cp finalized Jan 10 12:00:08 prasad-kvm kernel: [ 3449.903435] radeon 0000:02:00.0: ffff88022ae3d200 unpin not necessary Jan 10 12:00:08 prasad-kvm kernel: [ 3449.903490] [drm] radeon: ttm finalized Jan 10 12:00:08 prasad-kvm kernel: [ 3449.903551] vga_switcheroo: disabled Thanks a lot for helping me out. Thanks and Regards, Prasad
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