On Tue, Sep 28, 2010 at 10:27:18AM +0200, Inigo Losada wrote: > We are using pci passthrough with an SCSI Adapter card. The system is: > > - O.S: Ubuntu 10.04.1 LTS > - KVM Packages: > > kvm 1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.2 > kvm-pxe 5.4.4-1ubuntu1 > qemu-kvm 0.12.3+noroms-0ubuntu9.2 > libvirt-bin 0.7.5-5ubuntu27.2 > python-libvirt 0.7.5-5ubuntu27.2 > libvirt0 0.7.5-5ubuntu27.2 > > - Kernel 2.6.32.15+drm33.5.iommu recompiled with following options : > > CONFIG_DMAR=y > CONFIG_INTR_REMAP=y > > - Apparmor is stopped > > When we started the virtual machine we obtain the following error: > > char device redirected to /dev/pts/3 > device: 04:04.0: driver="pci-assign" host="04:04.0" > Failed to assign irq for "04:04.0": Operation not permitted > Perhaps you are assigning a device that shares an IRQ with another device? So do you? The notes in http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM give you this information: * VT-d spec specifies that all conventional PCI devices behind a * PCIe-to PCI/PCI-X bridge or conventional PCI bridge can only be * collectively assigned to the same guest. PCIe devices do not have * this restriction. * If the device doesn't support MSI, and it shares IRQ with other * devices, then it cannot be assigned due to host irq sharing for * assigned devices is not supported. You will get warning message * when you assign it. Notice this also apply to the devices which * only support MSI-X. What do you find in /proc/interrupts ? Best regards, Sebastian -- 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
