Am 12.12.2010 23:31, Erik Brakkee wrote: > Jan Kiszka wrote: >> >>>> Are there some tuning parameters I can use or perhaps even kernel >>>> configuration paramters on the host to solve this? >>>> >>>> Cheers >>>> Erik >>>> >>>> Host: Motherboard Supermicro X8DTi-F, Intel Xeon L5630, 12MB >>>> OS: Opensuse 11.3 64 bit >>>> >>>> Guest: OS: Opensuse 11.3 64 bit >>>> >>> I can say now that I am giving up on getting this to work. One >>> alternative was to use PCI passthrough the USB hardware, but that >>> didn't work for the USB that was on the motherboard. So I bought a USB >>> PCI card and tried to use PCI passthrough for that. Unfortunately other >>> problems occured there. >>> >>> For one, the problem with 4K alignment. But I could fix that by using >>> the pci=resource_alignment=... kernel parameter. In my grub/menu.lst it >>> says: >>> >>> kernel /vmlinuz-2.6.34.7-0.5-default root=/dev/hsystem/root quiet >>> showopts intel_iommu=on >>> pci=resource_alignment=01:04.0;01:04.1;01:04.2 noirqdebug vga=0x31a >>> >>> >>> The noirqdebug flas was needed to avoid the host from disabling the IRQ >>> (it was a shared IRQ). >>> >>> Using this, I could configure PCI passthrough and start the VM. Also the >>> USB device showed up there. Only it did not work at all. >>> >>> Here is a summary of my journey up until know: >>> >>> The original approach I wanted to use was to pass my old PCI card (WinTV >>> PVR-500) to a VM. This card is a well supported card and has been doing >>> fine for me. Because of the PCI passthrough problems with the wintv >>> card, I decided to try a USB card instead. This gave me a 'ctrl buffer >>> too small' issue that I could solve by taking the source RPM for kvm and >>> applying a known patch from red hat (increasing buffer size from 2048 to >>> 8192). But then I got jerky video, probably due to USB 1.1 issues. To >>> bypass these I could use PCI passthrough for USB. But with the PCI >>> passthrough of this card I am again running into issues probably related >>> to Shared IRQs. So, after all this I am back to square one. >>> >>> I have now modified my approach so instead of running a separate minimal >>> host with my old server as a guest, I am now running the old server >>> (same install) on the new hardware, using it as a host. I would >>> definitely be interested in trying this out further in the future. I >>> even tried Xen for a brief moment, only to realize that my host and >>> guest felt slower (slower startup and execution) and much more difficult >>> to handle. >>> >>> From the experience of the last two days fulltime trying to get things >>> working I can only conclude that the following two features would be >>> really important to have: >>> >>> * Extended PCI passthrough support >>> o shared IRQ support >>> >> Addressed by the series I sent out today. >> > Does this mean I have a chance now that PCI passthrough of my WinTV > PVR-500 might work now? > What version is this and where can I get this for opensuse? Currently you have to clone my git trees [1, 2], then build and install those to have the feature. Will take a while to see it in releases, and after that also Opensuse packages. Jan [1] git://git.kiszka.org/linux-kvm.git queues/dev-assign [2] git://git.kiszka.org/qemu-kvm.git queues/dev-assign
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